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Find video protocols related to scientific articles indexed in Pubmed.
Trade-offs of the opto-electrical properties of a-Si:H solar cells based on MOCVD BZO films.
Phys Chem Chem Phys
PUBLISHED: 11-20-2014
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Boron-doped zinc oxide (BZO) films, deposited by metal-organic chemical vapor deposition (MOCVD), have been widely used as front electrodes in thin-film solar cells due to their native pyramidal surface structure, which results in efficient light trapping. This light trapping effect can enhance the short-circuit current density (Jsc) of solar cells. However, nanocracks or voids in the silicon active layer may form when the surface morphology of the BZO is too sharp; this usually leads to degraded electrical properties of the cells, such as open-circuit voltage (Voc) and the fill factor (FF), which in turn decreases efficiency (Eff) [Bailat et al., Photovoltaic Energy Conversion, Conference Record of the 2006 IEEE 4th World Conference on. IEEE, 2006, vol. 2, pp. 1533-1536]. In this paper, an etching and coating method was proposed to modify the sharp "pyramids" on the surface of the BZO films. As a result, an evident enhancement was achieved for these modified, BZO-based cells' Voc, FF, and Eff, although the Jsc exhibited a small decrease. In order to increase the Jsc and maintain the improved electrical properties (Voc, FF) of the cell, a thin BZO coating, deposited by MOCVD, was introduced to coat the sputtering-treated BZO film. Finally, we optimized the trade-off among the Voc, FF, and Jsc, that is, we identified a regime with an increase of the Jsc as well as a further improvement of the other electrical properties.
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Therapeutic effect of Jinlongshe Granule () on quality of life of stage IV gastric cancer patients using EORTC QLQ-C30: A double-blind placebo-controlled clinical trial.
Chin J Integr Med
PUBLISHED: 11-16-2014
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To evaluate the impact of Jinlongshe Granule (, JLSG) on quality of life (QOL) of stage IV gastric cancer patients.
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Regional optimal allocation for reducing waste loads via artificial neural network and particle swarm optimization: a case study of ammonia nitrogen in Harbin, northeast China.
Water Sci. Technol.
PUBLISHED: 10-18-2014
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Cutting external waste loads can improve water quality. Allocation for reducing waste loads should consider changing variables, such as river flows and pollutant emissions. A particle swarm optimization (PSO) method and coupling artificial neural network (ANN) models have been applied to optimize reduction rates of ammonia nitrogen (NH3-N) loads from sewage outlets in Harbin, northeast China. For the planned water quality functional section (WQFS), the NH3-N concentration is related to emitted pollutant loads and can be well predicted by ANN linkage models. Further, NH3-N load reduction rates of all outlets are optimized by PSO with the water quality standard target. The highest NH3-N concentrations occur in January and February, a typical low-flow period in Harbin. The results delivered optimum NH3-N reduction rates for the five outlets, for January and February 2011. All predicted NH3-N concentrations after the reduction meet the water quality standard. The results indicate that the outlet with the highest NH3-N load has the biggest reduction rate in each WQFS, and outlets in the WQFS with higher background NH3-N concentrations need to cut more NH3-N loads. Decision-makers should not only focus on the outlet with the highest NH3-N emission load, but also ensure that the NH3-N concentration of upper WQFS meets the water quality goal.
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[Study on release kinetics for gel of Aconitum brachypodum based on nonlinear mixed effect model].
Zhongguo Zhong Yao Za Zhi
PUBLISHED: 10-03-2014
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To establish the analytical method for the release kinetic (RK) of Aconitum Brachypodum gel based on the nonlinear mixed effect model (NLMEM), in order to rationally evaluate the drug release process and explain the release mechanism.
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The clinical and trichoscopic features of syphilitic alopecia.
J Dermatol Case Rep
PUBLISHED: 09-30-2014
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Syphilitic alopecia is not common in patients with secondary syphilis. Though the clinical and histopathological findings of syphilitic alopecia have been described, the trichoscopy features are unknown yet.
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A method of analysis for T-2 toxin and neosolaniol by UPLC-MS/MS in apple fruit inoculated with Trichothecium roseum.
Food Addit Contam Part A Chem Anal Control Expo Risk Assess
PUBLISHED: 09-26-2014
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Trichothecenes are one of the most important groups of mycotoxins produced by Trichothecium roseum, which causes core rot of apple. A reliable and sensitive method was developed and successfully applied for the rapid detection of trichothecenes including T-2 toxin and neosolaniol in harvested apple using UPLC-MS/MS. After the extraction of the two mycotoxins from the apple matrix with methanol/water (80/20, v/v), the concentrated extracts were cleaned-up by PriboFast M270 columns and then analysed by UPLC-MS/MS. T-2 toxin and neosolaniol were effectively separated as unique peaks. The validity of this method was established by its linearity (R(2) ? 0.9995), precision (relative standard deviation ? 3.6%), accuracy, selectivity, limit of detection of 2-5 ?g kg(-1), limit of quantification of 5-10 ?g kg(-1) and average recovery of 73-96%. Levels of T-2 toxin were found in the range 7.1-128.4 µg kg(-1) in the core rot lesion of three cultivars apple (cvs. Red Delicious, Fuji and Ralls). T-2 was detected not only in the lesion, but also in the tissue without any disease symptoms. However, neosolaniol was only detected in the lesion on 'Red Delicious' apples. In addition, the concentration of T-2 toxin in the susceptible cultivar (cv. Fuji) was significantly higher than that in the resistant one (cv. Ralls). This method proved to be suitable at detecting T-2 and neosolaniol simultaneously in apples infected with T. roseum.
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Structures of Naturally Evolved CUP1 Tandem Arrays in Yeast Indicate That These Arrays Are Generated by Unequal Nonhomologous Recombination.
G3 (Bethesda)
PUBLISHED: 09-20-2014
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An important issue in genome evolution is the mechanism by which tandem duplications are generated from single-copy genes. In the yeast Saccharomyces cerevisiae, most strains contain tandemly duplicated copies of CUP1, a gene that encodes a copper-binding metallothionein. By screening 101 natural isolates of S. cerevisiae, we identified five different types of CUP1-containing repeats, as well as strains that only had one copy of CUP1. A comparison of the DNA sequences of these strains indicates that the CUP1 tandem arrays were generated by unequal nonhomologous recombination events from strains that had one CUP1 gene.
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Traffic-Related PM2.5 Induces Cytosolic [Ca(2+)] Increase Regulated by Orai1, Alters the CaN-NFAT Signaling Pathway, and Affects IL-2 and TNF-? Cytoplasmic Levels in Jurkat T-Cells.
Arch. Environ. Contam. Toxicol.
PUBLISHED: 09-07-2014
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The atmospheric particulate matter with a diameter less than or equal to 2.5 um (PM2.5) can result in increased immune system damage or diseases, however, the possible mechanism remains unclear. In this study, we used Jurkat T cells to determine the effects of PM2.5 on T cell-mediated adaptive immune response. Our results indicated that PM2.5 exposure increased intracellular calcium ion concentration [Ca(2+)]. In contrast, cytosolic free Ca(2+) concentration [Ca(2+)]i significantly decreased in Jurkat T cells transfected with Orai1siRNA. In addition, we detected the level of interleukin (IL)-2 and tumor-necrosis factor (TNF)-? as well as other signalling molecules, including calcineurin (CaN) and NFATc2, a gene on 20q13.2 that encodes a member of the nuclear factor of activated T cells (NFAT), in the supernatant of cells exposed to PM2.5. The expression of NFATc2 protein increased in a time-dependent manner after exposure to PM2.5, but the activity of CaN decreased. NFATc2 was not consistent with IL-2 accumulation, thus indicating the involvement of other signals in the suppression of IL-2 accumulation. Our findings demonstrate that PM2.5 exposure in immune cells results in locally increased [Ca(2+)]i generated by Orai1 and CaN-NFAT gene expression, TNF-? and IL-2 cytoplasmic concentrations may be altered.
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Graphenized Carbon Nanofiber: A Novel Light-Trapping and Conductive Material to Achieve an Efficiency Breakthrough in Silicon Solar Cells.
Adv. Mater. Weinheim
PUBLISHED: 09-06-2014
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An innovative 1D material-graphenized carbon nanofiber-is designed and synthesized. The nanofiber exhibits superior light-scattering property, ultralow absorption loss, and high electrical conductivity, and enables a wide range of applications. Simply integrating the nanofibers with the state-of-the-art silicon solar cells leads to a leaping efficiency boost of 3.8%, almost five times higher than the current world record.
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The significance of serum xanthine oxidoreductase in patients with nonalcoholic fatty liver disease.
Clin. Lab.
PUBLISHED: 09-05-2014
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Serum uric acid levels are significantly associated with nonalcoholic fatty liver disease (NAFLD). Xanthine oxidoreductase (XOR) is the key enzyme that catalyzes the formation of uric acid. The aim of this study was to investigate the association between serum XOR activity and NAFLD.
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Up-regulation of the Sirtuin 1 (Sirt1) and Peroxisome Proliferator-activated Receptor ? Coactivator-1? (PGC-1?) Genes in White Adipose Tissue of Id1 Protein-deficient Mice: IMPLICATIONS IN THE PROTECTION AGAINST DIET AND AGE-INDUCED GLUCOSE INTOLERANCE.
J. Biol. Chem.
PUBLISHED: 09-04-2014
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Id1, a helix-loop-helix (HLH) protein that inhibits the function of basic HLH E protein transcription factors in lymphoid cells, has been implicated in diet- and age-induced obesity by unknown mechanisms. Here we show that Id1-deficient mice are resistant to a high fat diet- and age-induced obesity, as revealed by reduced weight gain and body fat, increased lipid oxidation, attenuated hepatosteatosis, lower levels of lipid droplets in brown adipose tissue, and smaller white adipocytes after a high fat diet feeding or in aged animals. Id1 deficiency improves glucose tolerance, lowers serum insulin levels, and reduces TNF? gene expression in white adipose tissue. Id1 deficiency also increased expression of Sirtuin 1 and peroxisome proliferator-activated receptor ? coactivator 1?, regulators of mitochondrial biogenesis and energy expenditure, in the white adipose tissue. This effect was accompanied by the elevation of several genes encoding proteins involved in oxidative phosphorylation and fatty acid oxidation, such as cytochrome c, medium-chain acyl-CoA dehydrogenase, and adipocyte protein 2. Moreover, the phenotype for Id1 deficiency was similar to that of mice expressing an E protein dominant-positive construct, ET2, suggesting that the balance between Id and E proteins plays a role in regulating lipid metabolism and insulin sensitivity.
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[Study on reductive surgery for pelvic organ prolapse concomitant with anti-incontinence sling for treatment of occult stress urinary incontinence].
Zhonghua Fu Chan Ke Za Zhi
PUBLISHED: 08-30-2014
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To evaluate the clinical outcome of anti-incontinence sling in the treatment of occult stress urinary incontinence (OSUI) during reductive surgery for advanced pelvic organ prolapse (POP).
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Characterisation of a plancitoxin-1-like DNase II gene in Trichinella spiralis.
PLoS Negl Trop Dis
PUBLISHED: 08-28-2014
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Deoxyribonuclease II (DNase II) is a well-known acidic endonuclease that catalyses the degradation of DNA into oligonucleotides. Only one or a few genes encoding DNase II have been observed in the genomes of many species. 125 DNase II-like protein family genes were predicted in the Trichinella spiralis (T. spiralis) genome; however, none have been confirmed. DNase II is a monomeric nuclease that contains two copies of a variant HKD motif in the N- and C-termini. Of these 125 genes, only plancitoxin-1 (1095 bp, GenBank accession no. XM_003370715.1) contains the HKD motif in its C-terminus domain.
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The diagnostic value of the FIB-4 index for staging hepatitis B-related fibrosis: a meta-analysis.
PLoS ONE
PUBLISHED: 08-28-2014
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Liver fibrosis stage is an important factor in determining prognosis and need for treatment in patients infected with hepatitis B virus (HBV). Liver biopsies are typically used to assess liver fibrosis; however, noninvasive alternatives such as the FIB-4 index have also been developed.
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Role of hydrogen plasma pretreatment in improving passivation of the silicon surface for solar cells applications.
ACS Appl Mater Interfaces
PUBLISHED: 08-27-2014
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We have investigated the role of hydrogen plasma pretreatment in promoting silicon surface passivation, in particular examining its effects on modifying the microstructure of the subsequently deposited thin hydrogenated amorphous silicon (a-Si:H) passivation film. We demonstrate that pretreating the silicon surface with hydrogen plasma for 40 s improves the homogeneity and compactness of the a-Si:H film by enhancing precursor diffusion and thus increasing the minority carrier lifetime (?(eff)). However, excessive pretreatment also increases the density of dangling bond defects on the surface due to etching effects of the hydrogen plasma. By varying the duration of hydrogen plasma pretreatment in fabricating silicon heterojunction solar cells based on textured substrates, we also demonstrate that, although the performance of the solar cells shows a similar tendency to that of the ?(eff) on polished wafers, the optimal duration is prolonged owing to the differences in the surface morphology of the substrates. These results suggest that the hydrogen plasma condition must be carefully regulated to achieve the optimal level of surface atomic hydrogen coverage and avoid the generation of defects on the silicon wafer.
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A genetic variant (rs17251221) in the calcium-sensing receptor relates to hepatocellular carcinoma susceptibility and clinical outcome treated by transcatheter hepatic arterial chemoembolization (TACE) therapy.
Med. Oncol.
PUBLISHED: 08-26-2014
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Experimental and epidemiologic studies indicated that calcium-sensing receptor (CaSR) polymorphisms were associated with cancer risk, yet no data are available for candidate gene and hepatocellular carcinoma (HCC) risk. To address this, we evaluated whether CaSR rs17251221 polymorphism is associated with HCC susceptibility, clinicopathological parameters, and prognosis in HCC patients treated by TACE. A TaqMan assay was used to genotype rs17251221 SNP in this case (n = 843)-control (n = 783) study. A significant increased risk of HCC was observed in patients carrying rs17251221 GG (adjusted OR 1.355, 95 % CI 1.024-1.793, P = 0.033), AG/GG genotype (adjusted OR 1.254, 95 % CI 1.007-1.561, P = 0.043), and G allele (adjusted OR 1.163, 95 % CI 1.013-1.335, P = 0.032). Furthermore, a significant association was found between Child-Pugh class, serum BCLC stage, and AFP level and rs17251221 genotypes. More importantly, individuals carrying rs17251221 AG, GG genotype showed significantly longer MST than AA genotype and significant hazard ration (AG: adjusted HR 0.484, 95 % CI 0.406-0.577, P < 0.001; GG: adjusted HR 0.633, 95 % CI 0.575-0.697, P < 0.001, respectively). Meanwhile, we found a favorable HR for AG/GG genotype carriers (adjusted HR 0.645, 95 % CI 0.542-0.768, P < 0.001). These results indicated that CaSR rs17251221 polymorphism is associated with susceptibility to HCC, and rs17251221 G allele genotype showed significant independent better prognosis of HCC patients treated with TACE.
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Two-dimensional high efficiency thin-film silicon solar cells with a lateral light trapping architecture.
Sci Rep
PUBLISHED: 08-22-2014
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Introducing light trapping structures into thin-film solar cells has the potential to enhance their solar energy harvesting as well as the performance of the cells; however, current strategies have been focused mainly on harvesting photons without considering the light re-escaping from cells in two-dimensional scales. The lateral out-coupled solar energy loss from the marginal areas of cells has reduced the electrical yield indeed. We therefore herein propose a lateral light trapping structure (LLTS) as a means of improving the light-harvesting capacity and performance of cells, achieving a 13.07% initial efficiency and greatly improved current output of a-Si:H single-junction solar cell based on this architecture. Given the unique transparency characteristics of thin-film solar cells, this proposed architecture has great potential for integration into the windows of buildings, microelectronics and other applications requiring transparent components.
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Improved amorphous/crystalline silicon interface passivation for heterojunction solar cells by low-temperature chemical vapor deposition and post-annealing treatment.
Phys Chem Chem Phys
PUBLISHED: 08-21-2014
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In this study, hydrogenated amorphous silicon (a-Si:H) thin films are deposited using a radio-frequency plasma-enhanced chemical vapor deposition (RF-PECVD) system. The Si-H configuration of the a-Si:H/c-Si interface is regulated by optimizing the deposition temperature and post-annealing duration to improve the minority carrier lifetime (?eff) of a commercial Czochralski (Cz) silicon wafer. The mechanism of this improvement involves saturation of the microstructural defects with hydrogen evolved within the a-Si:H films due to the transformation from SiH2 into SiH during the annealing process. The post-annealing temperature is controlled to ?180 °C so that silicon heterojunction solar cells (SHJ) could be prepared without an additional annealing step. To achieve better performance of the SHJ solar cells, we also optimize the thickness of the a-Si:H passivation layer. Finally, complete SHJ solar cells are fabricated using different temperatures for the a-Si:H film deposition to study the influence of the deposition temperature on the solar cell parameters. For the optimized a-Si:H deposition conditions, an efficiency of 18.41% is achieved on a textured Cz silicon wafer.
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Preparation of a push-pull osmotic pump of felodipine solubilized by mesoporous silica nanoparticles with a core-shell structure.
Int J Pharm
PUBLISHED: 08-20-2014
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The purpose of this study was to use mesoporous silica nanoparticles to improve drug dissolution after releasing from a push-pull osmotic pump. Felodipine was selected as the model drug and it was first incorporated into mesoporous silica nanoparticles prepared previously by the solvent evaporation method after we had examined a series of drug-silica ratios to load the drug into the mesoporous silica nanoparticles in order to find the optimum ratio for drug loading. Then, the drug-carrier was added to the drug-layer of the push-pull osmotic pump. PEO (Mw 100,000) was used as a suspending agent and PEO (Mw 6,000,000) was used as an expanding agent. The core tablets were coated with cellulose acetate (CA) as a semipermeable membrane containing polyethylene glycol (PEG) 6000 to control the membrane permeability. In vitro dissolution studies showed that the self-made osmotic pump tablets were able to deliver felodipine in an approximately zero-order manner in 12h. A pharmacokinetic study was carried out to compare the new system with reference sustained-release tablets. It was found that the half-life of felodipine in the push-pull osmotic pump tablets was prolonged 1.8-fold, the bioavailability was increased 18% and the maximum plasma concentration reduced by 25%. In conclusion, using the self-made push-pull osmotic pump in combination with mesoporous silica nanoparticles was able to effectively increase the bioavailability of felodipine and reduce fluctuations in its plasma concentration.
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Exposure fusion using boosting Laplacian pyramid.
IEEE Trans Cybern
PUBLISHED: 08-20-2014
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This paper proposes a new exposure fusion approach for producing a high quality image result from multiple exposure images. Based on the local weight and global weight by considering the exposure quality measurement between different exposure images, and the just noticeable distortion-based saliency weight, a novel hybrid exposure weight measurement is developed. This new hybrid weight is guided not only by a single image's exposure level but also by the relative exposure level between different exposure images. The core of the approach is our novel boosting Laplacian pyramid, which is based on the structure of boosting the detail and base signal, respectively, and the boosting process is guided by the proposed exposure weight. Our approach can effectively blend the multiple exposure images for static scenes while preserving both color appearance and texture structure. Our experimental results demonstrate that the proposed approach successfully produces visually pleasing exposure fusion images with better color appearance and more texture details than the existing exposure fusion techniques and tone mapping operators.
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[Effect of shifting sand burial on evaporation reduction and salt restraint under saline water irrigation in extremely arid region].
Ying Yong Sheng Tai Xue Bao
PUBLISHED: 08-19-2014
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The Taklimakan Desert Highway Shelterbelt is drip-irrigated with high saline groundwater (2.58-29.70 g x L(-1)), and shifting sand burial and water-salt stress are most common and serious problems in this region. So it is of great importance to study the effect of shifting sand burial on soil moisture evaporation, salt accumulation and their distribution for water saving, salinity restraint, and suitable utilization of local land and water resources. In this study, Micro-Lysimeters (MLS) were used to investigate dynamics of soil moisture and salt under different thicknesses of sand burial (1, 2, 3, 4, and 5 cm), and field control experiments of drip-irrigation were also carried out to investigate soil moisture and salt distribution under different thicknesses of shifting sand burial (5, 10, 15, 20, 25, 30, 35, and 40 cm). The soil daily and cumulative evaporation decreased with the increase of sand burial thickness in MLS, cumulative evaporation decreased by 2.5%-13.7% compared with control. And evaporative inhibiting efficiency increased with sand burial thickness, evaporative inhibiting efficiency of 1-5 cm sand burial was 16.7%-79.0%. Final soil moisture content beneath the interface of sand burial increased with sand burial thickness, and it increased by 2.5%-13.7% than control. The topsoil EC of shifting sand in MLS decreased by 1.19-6.00 mS x cm(-1) with the increasing sand burial thickness, whereas soil salt content beneath the interface in MLS increased and amplitude of the topsoil salt content was higher than that of the subsoil. Under drip-irrigation with saline groundwater, average soil moisture beneath the interface of shifting sand burial increased by 0.4% -2.0% compare with control, and the highest value of EC was 7.77 mS x cm(-1) when the sand burial thickness was 10 cm. The trend of salt accumulation content at shifting sand surface increased firstly, and then decreased with the increasing sand burial thickness. Soil salt contents beneath the interface of shifting sand burial were much lower than that of shifting sand surface. 35 cm was the critical sand burial thickness for water-saving and salt restraint. In summary, sand burial had obvious inhibition effects on soil evaporation and salt accumulation, so maybe it could be used to save water and reduce salt accumulation in arid shifting desert areas.
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CO2-switchable multi-compartment micelles with segregated corona.
Soft Matter
PUBLISHED: 07-25-2014
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CO2-switchable multi-compartment micelles (MCMs) with a segregated corona formed by a purpose-designed ABC triblock copolymer are reported. They can be switched "on" and "off" when sequentially treated with CO2 and N2, due to the protonation-deprotonation of the tertiary amine groups along the polymer skeleton.
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Clinical features of primary cicatricial alopecia in Chinese patients.
Indian J Dermatol Venereol Leprol
PUBLISHED: 07-19-2014
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There have been few reports on primary cicatricial alopecias (PCR) especially from Asia (PCA).
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Electrogenerated chemiluminescence aptasensor for ultrasensitive detection of thrombin incorporating an auxiliary probe.
Talanta
PUBLISHED: 07-18-2014
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A novel electrogenerated chemiluminescence (ECL) aptasensor for ultrasensitive detection of thrombin incorporating an auxiliary probe was designed by employing specific anti-thrombin aptamer as a capture probe and a ruthenium(II) complex-tagged reporter probe as an ECL probe and an auxiliary probe to assist the ECL probe close to the surface of the electrode. The ECL aptasensor was fabricated by self-assembling a thiolated capture probe on the surface of gold electrode and then hybridizing the ECL probe with the capture probe, and further self-assembling the auxiliary probe. When analyte thrombin was bound with the capture probe, the part of the dehybridized ECL probe was hybridized with the neighboring auxiliary probe, led to the tagged ruthenium(II) complex close to the electrode surface, resulted in great increase in the ECL intensity. The results showed that the increased ECL intensity was directly related to the logarithm of thrombin concentrations in the range from 5.0 × 10(-15)M to 5.0 × 10(-12)M with a detection limit of 2.0 × 10(-15)M. This work demonstrates that employing an auxiliary probe which exists nearby the capture probe can enhance the sensitivity of the ECL aptasensor. This promising strategy will be extended to the design of other biosensors for detection of other proteins and genes.
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Endocan levels in peripheral blood predict outcomes of acute respiratory distress syndrome.
Mediators Inflamm.
PUBLISHED: 07-16-2014
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To investigate the prognostic significance of endocan, compared with procalcitonin (PCT), C-reactive protein (CRP),white blood cells (WBC), neutrophils (N), and clinical severity scores in patients with ARDS.
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Tumor suppressor p53 cooperates with SIRT6 to regulate gluconeogenesis by promoting FoxO1 nuclear exclusion.
Proc. Natl. Acad. Sci. U.S.A.
PUBLISHED: 07-09-2014
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In mammalian cells, tumor suppressor p53 plays critical roles in the regulation of glucose metabolism, including glycolysis and oxidative phosphorylation, but whether and how p53 also regulates gluconeogenesis is less clear. Here, we report that p53 efficiently down-regulates the expression of phosphoenolpyruvate carboxykinase (PCK1) and glucose-6-phosphatase (G6PC), which encode rate-limiting enzymes in gluconeogenesis. Cell-based assays demonstrate the p53-dependent nuclear exclusion of forkhead box protein O1 (FoxO1), a key transcription factor that mediates activation of PCK1 and G6PC, with consequent alleviation of FoxO1-dependent gluconeogenesis. Further mechanistic studies show that p53 directly activates expression of the NAD(+)-dependent histone deacetylase sirtuin 6 (SIRT6), whose interaction with FoxO1 leads to FoxO1 deacetylation and export to the cytoplasm. In support of these observations, p53-mediated FoxO1 nuclear exclusion, down-regulation of PCK1 and G6PC expression, and regulation of glucose levels were confirmed in C57BL/J6 mice and in liver-specific Sirt6 conditional knockout mice. Our results provide insights into mechanisms of metabolism-related p53 functions that may be relevant to tumor suppression.
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[Chlamydia pneumoniae persistent infection is associated with primary IgA nephropathy].
Xi Bao Yu Fen Zi Mian Yi Xue Za Zhi
PUBLISHED: 07-09-2014
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To explore the correlations between Chlamydia pneumoniae (CP) infection and IgA nephropathy (IgAN).
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Prevalence and molecular characterization of structural hemoglobin variants in the Dongguan region of Guangdong province, southern China.
Hemoglobin
PUBLISHED: 07-02-2014
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The aim of the present study was to find the most prevalent structural hemoglobin (Hb) variants in southern China and to present hematological and molecular data of abnormal Hbs in the population from southern China. The type and frequency of structural Hb variants and their hematological and molecular characteristics were identified in 131 individuals from 30,848 unrelated partners who were referred to the prenatal clinic of Dongguan Maternal & Children Health Hospital, Dongguan, Guangdong, People's Republic of China (PRC) from 2011 to 2013. ?-Globin or ?-globin chain variants were screened using a capillary electrophoresis (CE) system, and ?-globin or ?-globin gene mutations were confirmed using sequencing techniques. The gene frequency of Hb variants was 0.4% (131/30,848). The most common ?-globin variants were Hb Constant Spring (Hb CS, HBA2: c.427T?>?C) (0.2%), followed by Hb Q-Thailand (HBA1: c.223G?>?C) and Hb G-Honolulu (HBA2: c.91G?>?C). The most common ?-globin variant was Hb E (HBB: c.79G?>?A) (0.09%), followed by Hb New York (HBB: c.341T?>?A). Our results provide a detailed prevalence and molecular characterization of abnormal Hbs in the population of the Dongguan region. These findings have important implications for a region with a high frequency of ?- and ?-thalassemias.
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Sensitivity and specificity of Dickkopf-1 protein in serum for diagnosing hepatocellular carcinoma: a meta-analysis.
Int. J. Biol. Markers
PUBLISHED: 06-26-2014
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This meta-analysis evaluated the diagnostic accuracy of positive serum Dickkopf-1 (DKK1) for diagnosing hepatocellular carcinoma (HCC).
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Estrogen inhibits LPS-induced IL-6 production in macrophages partially via the nongenomic pathway.
Immunol. Invest.
PUBLISHED: 06-24-2014
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17?-estradiol (E2)-signaling is widely considered to be mediated through the transcription-regulating intracellular estrogen receptor (iER). In this study, using the cell-impermeable E2-BSA, we investigated the nongenomic effects of E2 on the IL-6 production, MAPK and transcription factor activation following LPS stimulation in mouse bone marrow-derived macrophages (BMMs). It was found that E2 normalized LPS-induced IL-6 production in BMMs. Although the increase in IL-6 production induced by LPS was also attenuated by E2-BSA treatment, the capacity of BMMs to produce the IL-6 cytokine remained higher than the control. In addition, the iER blocker, ICI 182780, did not abolish the total effects of E2 on LPS-stimulated IL-6 production capacity in BMMs. Furthermore, E2 and E2-BSA attenuated the LPS activation of p38 but not that of ERK1/2 and JNK. The p38 inhibitor, SB 203580, significantly reduced the LPS-induced IL-6 production. Moreover, E2 and E2-BSA inhibited LPS-induced activation of NF-?B. This inhibitory effect was associated with decreases in nuclear p65 protein levels. Taken together, these results indicate that E2 has an inhibitory effect on LPS-induced IL-6 production in BMMs through inhibition of p38 MAPK phosphorylation, and blockade of NF-?B activation. These effects are mediated at least in part via a nongenomic pathway.
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Effects of quercetin on hedgehog signaling in chronic myeloid leukemia KBM7 cells.
Chin J Integr Med
PUBLISHED: 06-13-2014
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To investigate the effects of quercetin on Hedgehog (Hh) signaling in chronic myeloid leukemia KBM7 cells.
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Synthesis and biological evaluation of hybrids from farnesylthiosalicylic acid and hydroxylcinnamic acid with dual inhibitory activities of Ras-related signaling and phosphorylated NF-?B.
Org. Biomol. Chem.
PUBLISHED: 05-23-2014
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A series of hybrids (5a–r) of farnesylthiosalicylic acid (FTS) and hydroxylcinnamic acid were designed and synthesized. Most of the hybrids displayed potent antiproliferative activity against seven cancer cell lines in vitro, superior to FTS as well as sorafenib. The most potent compound 5f selectively inhibited cancer cells but not non-tumor liver cell proliferation in vitro, and significantly induced SMMC-7721 cell apoptosis. Interestingly, 5f could simultaneously inhibit not only Ras-related signaling but also phosphorylated NF-?B, which may synergetically contribute to the cell growth inhibition and apoptosis induction. Moreover, 5f showed low acute toxicity to mice and significantly inhibited the hepatoma tumor growth.
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A MD simulation and analysis for aggregation behaviors of nanoscale zero-valent iron particles in water via MS.
ScientificWorldJournal
PUBLISHED: 05-15-2014
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With the development of nanotechnology, more nanomaterials will enter into water environment system. Studying the existing form of nanomaterials in water environment will help people benefit from the correct use of them and to reduce the harm to human caused by them for some nanomaterials can bring polluting effect. Aggregation is a main behavior for nanoparticle in water environment. NZVI are used widely in many fields resulting in more NZVI in water environment. Molecular dynamics simulations and Materials Studio software are used to investigate the microaggregation behaviors of NZVI particles. Two scenes are involved: (1) particle size of NZVI in each simulation system is the same, but initial distance of two NZVI particles is different; (2) initial distance of two NZVI particles in each simulation system is the same, but particle size of NZVI is different. Atomistic trajectory, NP activity, total energy, and adsorption of H2O are analyzed with MS. The method provides new quantitative insight into the structure, energy, and dynamics of the aggregation behaviors of NZVI particles in water. It is necessary to understand microchange of NPs in water because it can provide theoretical research that is used to reduce polluting effect of NPs on water environment.
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A Case of Cutaneous Protothecosis Mimics Eczema.
Mycopathologia
PUBLISHED: 05-12-2014
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We report a case of cutaneous protothecosis due to Prototheca wickerhamii in an immunocompetent man presented with a specific eczema-like lesions. Dermatological examination revealed erythematous plaques, dark red papules with some coalescence, and a few superficial ulcerations, covered with less scales on his right side chest and neck. Fungal culture, histopathological examination and molecular identification confirmed the organism. Antifungal susceptibility testing revealed strain sensitive to amphotericin B, Fluconazole, itraconazole and voriconazole. The patient was cured by oral itraconazole capsules and topical cream ketoconazole 2 %.
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Chibby functions in Xenopus ciliary assembly, embryonic development, and the regulation of gene expression.
Dev. Biol.
PUBLISHED: 04-30-2014
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Wnt signaling and ciliogenesis are core features of embryonic development in a range of metazoans. Chibby (Cby), a basal-body associated protein, regulates ?-catenin-mediated Wnt signaling in the mouse but not Drosophila. Here we present an analysis of Cby?s embryonic expression and morphant phenotypes in Xenopus laevis. Cby RNA is supplied maternally, negatively regulated by Snail2 but not Twist1, preferentially expressed in the neuroectoderm, and regulates ?-catenin-mediated gene expression. Reducing Cby levels reduced the density of multiciliated cells, the number of basal bodies per multiciliated cell, and the numbers of neural tube primary cilia; it also led to abnormal development of the neural crest, central nervous system, and pronephros, all defects that were rescued by a Cby-GFP chimera. Reduction of Cby led to an increase in Wnt8a and decreases in Gli2, Gli3, and Shh RNA levels. Many, but not all, morphant phenotypes were significantly reversed by the Wnt inhibitor SFRP2. These observations extend our understanding of Cby?s role in mediating the network of interactions between ciliogenesis, signaling systems and tissue patterning.
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An integrative process of bioconversion of oil palm empty fruit bunch fiber to ethanol with on-site cellulase production.
Bioprocess Biosyst Eng
PUBLISHED: 04-28-2014
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The aim of this study was to efficiently convert oil palm empty fruit bunch fiber (OPEFB), one of the most commonly generated lingo-wastes in Southeast Asia, into both cellulase and bioethanol. The unprocessed cellulase crude (37.29 %) produced under solid-state fermentation using OPEFB as substrate showed a better reducing sugar yield using filter paper than the commercial enzyme blend (34.61 %). Organosolv pretreatment method could efficiently reduce hemicellulose (24.3-18.6 %) and lignin (35.2-22.1 %) content and increase cellulose content (40.5-59.3 %) from OPEFB. Enzymatic hydrolysis of pretreated OPEFB using the crude cellulase with 20 % solid content, enzyme loading of 15 FPU/g OPEFB at 50 °C, and pH 5.5 resulted in a OPEFB hydrolysate containing 36.01 g/L glucose after 72 h. Fermentation of the hydrolysate medium produced 17.64 g/L ethanol with 0.49 g/g yield from glucose and 0.088 g/g yield from OPEFB at 8 h using Saccharomyces cerevisiae.
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Appropriate second-line therapies for management of severe postpartum hemorrhage.
Int J Gynaecol Obstet
PUBLISHED: 04-25-2014
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To explore appropriate second-line therapies for management of severe postpartum hemorrhage at cesarean delivery.
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Synthesis of novel core-shell structured dual-mesoporous silica nanospheres and their application for enhancing the dissolution rate of poorly water-soluble drugs.
Mater Sci Eng C Mater Biol Appl
PUBLISHED: 04-16-2014
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Novel core-shell dual-mesoporous silica nanospheres (DMSS) with a tunable pore size were synthesized successfully using a styrene monomer as a channel template for the core and cetyltrimethyl ammonium bromide (CTAB) as a channel template for the shell in order to improve the dissolution rate of poorly water-soluble drugs. Simvastatin was used as a model drug and loaded into DMSS and the mesoporous core without the shell (MSC) by the solvent evaporation method. The drug loading efficiency of DMSS and MSC were determined by thermogravimetric analysis (TGA) and ultraviolet spectroscopy (UV). Characterization, using scanning electron microscopy (SEM), transmission electron microscopy (TEM), nitrogen adsorption, powder X-ray diffraction (XRD), differential scanning calorimetry (DSC), and Fourier transform infrared spectroscopy (FTIR) showed that simvastatin adsorbed in DMSS and MSC was in an amorphous state, and in vitro release test results demonstrated that both DMSS and MSC increased the water solubility and dissolution rate of simvastatin. The shell structure of DMSS was able to regulate the release of simvastatin compared with MSC. It is worth noting that DMSS has significant potential as a carrier for improving the dissolution of poorly water-soluble drugs and reducing the rapid release.
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Association between serum free fatty acid levels and nonalcoholic fatty liver disease: a cross-sectional study.
Sci Rep
PUBLISHED: 04-03-2014
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High serum free fatty acid (FFA) levels are associated with metabolic syndrome (MS). This study aimed to assess the association of fasting serum FFAs with nonalcoholic fatty liver disease (NAFLD) in a Chinese population. A total of 840 subjects fulfilled the diagnostic criteria of NAFLD and 331 healthy control participants were enrolled in this cross-sectional study. Fasting serum FFA levels and other clinical and laboratory parameters were measured. NAFLD patients had significantly higher serum FFA levels than controls (P < 0.001). Serum FFA levels were significantly and positively correlated with parameters of MS, inflammation indexes, and markers of hepatocellular damage. Elevated serum FFA levels were found in NAFLD subjects with individual components of MS (obesity, hypertriglyceridaemia, and hyperglycaemia). Stepwise regression showed that serum FFA levels were an independent factor predicting advanced fibrosis (FIB-4 ? 1.3) in NAFLD patients. Serum FFA levels correlated with NAFLD and could be used as an indicator for predicting advanced fibrosis in NAFLD patients.
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Serum CCL2 and CCL3 as potential biomarkers for the diagnosis of oral squamous cell carcinoma.
Tumour Biol.
PUBLISHED: 03-26-2014
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Monocyte chemotactic protein-1 (MCP-1/CCL2) and macrophage inflammatory protein-1? (MIP-1?/CCL3) are small chemotactic proteins that have been found in several kinds of tumor tissue samples and function as key regulators of cancer progression. However, the expression of CCL2 and CCL3 in serum samples of oral squamous cell carcinoma (OSCC) patients remains unknown. This study aimed to investigate the prognostic meaning of serum CCL2 and CCL3 in OSCC. The concentration of CCL2 and CCL3 was assessed by ELISA in serum of OSCC patients (n?=?98), leukoplakia patients (n?=?14), and healthy donors (n?=?27). The results showed that the concentration of CCL2 in the OSCC group was significantly lower compared to that in the healthy controls (67.81 vs. 108.1 pg/ml, P?
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A prospective, randomized study on hepatotoxicity of anastrozole compared with tamoxifen in women with breast cancer.
Cancer Sci.
PUBLISHED: 03-19-2014
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Tamoxifen and anastrozole are widely used as adjuvant treatment for early stage breast cancer, but their hepatotoxicity is not fully defined. We aimed to compare hepatotoxicity of anastrozole with tamoxifen in the adjuvant setting in postmenopausal breast cancer patients. Three hundred and fifty-three Chinese postmenopausal women with hormone receptor-positive early breast cancer were randomized to anastrozole or tamoxifen after optimal primary therapy. The primary end-point was fatty liver disease, defined as a liver-spleen ratio <0.9 as determined using a computed tomography scan. The secondary end-points included abnormal liver function and treatment failure during the 3-year follow up. The cumulative incidence of fatty liver disease after 3 years was lower in the anastrozole arm than that of tamoxifen (14.6% vs 41.1%, P < 0.0001; relative risk, 0.30; 95% CI, 0.21-0.45). However, there was no difference in the cumulative incidence of abnormal liver function (24.6% vs 24.7%, P = 0.61). Interestingly, a higher treatment failure rate was observed in the tamoxifen arm compared with anastrozole and median times to treatment failure were 15.1 months and 37.1 months, respectively (P < 0.0001; HR, 0.27; 95% CI, 0.20-0.37). The most commonly reported adverse events were 'reproductive system disorders' in the tamoxifen group (17.1%), and 'musculoskeletal disorders' in the anastrozole group (14.6%). Postmenopausal women with hormone receptor-positive breast cancer receiving adjuvant anastrozole displayed less fatty liver disease, suggesting that this drug had a more favorable hepatic safety profile than tamoxifen and may be preferred for patients with potential hepatic dysfunction.
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Clinical application of elevated platelet-activating factor acetylhydrolase in patients with hepatitis B.
Lipids Health Dis
PUBLISHED: 03-07-2014
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The aim of this study was to investigate the variation of platelet-activating factor acetylhydrolase (PAF-AH) in patients with various stages of hepatitis B infection and evaluate the association between PAF-AH activity and chronic severe hepatitis B (CSHB) and mortality in patients with hepatitis B.
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Xiaotan Sanjie decoction attenuates tumor angiogenesis by manipulating Notch-1-regulated proliferation of gastric cancer stem-like cells.
World J. Gastroenterol.
PUBLISHED: 02-10-2014
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To determine the underlying mechanisms of action and influence of Xiaotan Sanjie (XTSJ) decoction on gastric cancer stem-like cells (GCSCs).
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Masticatory Muscles Dysfunction after CT-guided Percutaneous Trigeminal Radiofrequency Thermocoagulation for Trigeminal Neuralgia: A Detailed Analysis.
Pain Pract
PUBLISHED: 01-21-2014
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The aim of this study was to investigate the severity and the natural course of masticatory muscles weakness that developed after CT-guided percutaneous trigeminal radiofrequency thermocoagulation (PT-RFT) for the treatment of idiopathic trigeminal neuralgia (ITN).
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Effect of cultivars, Fusarium strains and storage temperature on trichothecenes production in inoculated potato tubers.
Food Chem
PUBLISHED: 01-16-2014
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Four trichothecenes (Fus-X, 3ADON, DAS and T-2) were detected in potato tubers inoculated with Fusarium spp. by UPLC-MS/MS. The influence of cultivars, Fusarium strains and storage temperature on trichothecenes production was evaluated. The concentration of trichothecenecs was much higher in susceptible cultivar (Longshu No. 3) than in resistant one (Longshu No. 6). The susceptible cultivar infected with Fusarium sulphureum had the maximum concentration of Fus-X, 3ADON and DAS. Among the three Fusarium strains, Fusarium solani had the strongest ability to produce T-2 in both susceptible and resistant cultivars. Room temperature storage was more likely to accumulate trichothecenes than low temperature storage. Meanwhile, the trichothecenes were found not only in the lesion but also in the adjacent asymptomatic tissue. Trichothecenes concentration showed a strong trend of decline with increase in distance from the infection point.
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Ru-indoloquinoline complex as a selective and effective human telomeric G-quadruplex binder.
Spectrochim Acta A Mol Biomol Spectrosc
PUBLISHED: 01-13-2014
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Indoloquinoline and its derivatives have been reported to be a kind of efficient G-quadruplex binder and have been found to interact preferentially to intramolecular G-quadruplex and inhibit telomerase activity in human K562 cells and SW620 cells. In contrast to indoloquinoline derivatives, much less is known about the metal complex based on indoloquinoline or its derivative. In this report, we studied the interaction of ruthenium complex [Ru(bpy)2(itatp)]2+ containing indoloquinoline moiety with human telomeric G-quadruplex DNA (Telo22) and c-myc G-quadruplex DNA (Pu27) by UV-visible (UV-Vis), fluorescence spectroscopy, fluorescent intercalator displacement (FID), thermal denaturation studies and CD spectroscopy. The results suggest that [Ru(bpy)2(itatp)]2+ displays a strong ?-? stacking interaction with human telomeric G-quadruplex with a high binding constant (?10(7) M(-1)), but just exhibits moderate binding affinity to c-myc G-quadruplex, thus showing significant selectivity to human telomeric G-quadruplex. The CD titration results indicate that [Ru(bpy)2(itatp)]2+ could effectively convert Telo22 into antiparallel G-quadruplex conformation, while in the c-myc G-quadruplex case, instead of promoting Pu27 to fold into G-quadruplex, [Ru(bpy)2(itatp)]2+ destroys the parallel G-quadruplex structure of Pu27.
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Ventricular septal rupture, right ventricular dissection, and tricuspid chordae rupture-A rare complication after inferior and right ventricular infarction.
J Clin Ultrasound
PUBLISHED: 01-10-2014
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A 76-year-old man under stable hemodynamic condition was admitted to our hospital for delayed percutaneous coronary intervention following a diagnosis of acute inferior myocardial infarction. Bedside echocardiography revealed ventricular septal rupture at the basal posteroinferior wall with a large left-to-right shunt. Right ventricular free-wall intramyocardial dissection and tricuspid chordae rupture were noted. Coronary angiography demonstrated occlusion of the proximal right coronary artery, which was treated by balloon angioplasty and stenting. While preparing for surgical repair, the patient's overall cardiac and renal function deteriorated and surgery was contraindicated. The patient died 16 days after discharge. © 2014 Wiley Periodicals, Inc. J Clin Ultrasound, 2014.
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Extensive laminectomy for multilevel cervical stenosis with ligamentum flavum hypertrophy: more than 10 years follow-up.
Eur Spine J
PUBLISHED: 01-06-2014
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The aim of this research was to evaluate the long-term results of extensive laminectomy for the treatment of cervical spondylotic myelopathy due to multilevel cervical stenosis (MCS) with ligamentum flavum hypertrophy (LFH).
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Pathological changes, TGF-?1 expression, and the effects of hepatocyte growth factor in 5/6 nephrectomized rats.
Ren Fail
PUBLISHED: 12-17-2013
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Abstract Several studies have shown that hepatocyte growth factor (HGF) ameliorates chronic renal failure, but its mechanism of action is unclear. This study was designed to test the delivery of HGF in the PCI-neo vector, using the 5/6 nephrectomized rat as a model for chronic renal failure, and to confirm that this protective function is associated with decreased protein expression of transforming growth factor-beta1 (TGF-?1). Rats were randomly divided into the following groups: Control (untreated), PCI-neo (vector control), 5/6 nephrectomy, and PCI-neo-HGF. Rats were sacrificed at both the fifth and ninth week after 5/6 nephrectomy. Kidney specimens were used for pathological examination (hematoxylin-eosin staining), and detection of TGF-?1 protein (Western blot and immunohistochemistry) expression. Blood urea nitrogen, serum creatinine, and 24-h urinary protein excretion (UPE) were increased, renal interstitium was seriously injured, and TGF-?1 protein expression was elevated in 5/6 nephrectomized rats compared to control rats at either time point. Red blood cell and hemoglobin levels decreased in the ninth week after 5/6 nephrectomy. PCI-neo-HGF expression ameliorated the aforementioned changes and decreased TGF-?1 expression, not only in the fifth week, but also in the ninth week after surgery. The process of renal injury in the 5/6 nephrectomized rat was consistent with that of chronic renal failure. The increase in TGF-?1 expression was maintained after 5/6 nephrectomy. HGF relieved chronic renal failure, this protection was associated with down-regulation of TGF-?1 protein expression, and the protective effects were long-term and stable after 5/6 nephrectomy.
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A new method for determining the absorbed dose in a radiation field by using a thiamine hydrochloride aqueous solution.
Anal Sci
PUBLISHED: 12-17-2013
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This research investigated the ionizing radiation effect on thiamine hydrochloride (TH) and its usability as an irradiation dosimeter. The fundamental principle is to determine the concentration variations of TH solutions with high-performance liquid chromatography (HPLC) after exposing to ?-rays. The decreasing peak area of TH in the HPLC chromatogram forms a linear relationship with the rising radiation dose. We investigated the characteristics and suitable application range of the TH as a new radiation dosimeter. The influence factors and mechanism of the reaction induced by radiation were also discussed. According to the correlation between the concentration and the radiation dose, 0.3 g/L of a TH solution is suitable for the 0.1 - 10 kGy dose range, and 2 g/L is appropriate for 0.1 - 20 kGy. The easy availability and the simple, but stable, chemical structure of thiamine makes it a potential candidate for radiation dose research. Also, the preparation proceeding for sampling is easy, and the result can be automatic monitored by liquid chromatography.
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High-energy noncollinear optical parametric-chirped pulse amplification in LBO at 800??nm.
Opt Lett
PUBLISHED: 12-11-2013
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The optical parametric-chirped pulse amplification (OPCPA) based on large-aperture nonlinear optical crystals is promising for implementation of an ultrahigh peak-power laser system of 10 PW and beyond. We demonstrated the highest energy broadband OPCPA at 800 nm, to the best of our knowledge, by using an 80 mm in diameter LiB3O5(LBO) amplifier, with an output energy of 28.68 J, a bandwidth of 80 nm (FWHM), and conversion efficiency of 25.38%. After compression, a peak power of 0.61 PW with 33.8 fs pulse duration is produced.
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Refractive index sensitivity enhancement of optical fiber cladding mode by depositing nanofilm via ALD technology.
Opt Express
PUBLISHED: 11-13-2013
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The atomic layer deposition (ALD) technology is introduced to enhance the sensitivity of optical fiber cladding mode to surrounding refractive index (SRI) variation. The highly uniform Al2O nanofilm was deposited around the double cladding fiber (DCF) which presents cladding mode resonant feature. With the high refractive index coating, the cladding mode resonant spectrum was tuned. And the sensitivity enhancement for SRI sensor was demonstrated. Through adjusting the deposition cycles, a maximum sensitivity of 723 nm/RIU was demonstrated in the DCF with 2500 deposition cycles at the SRI of 1.34. Based on the analysis of cladding modes reorganization, the cladding modes transition of the coated DCF was investigated theoretically. With the high performance nanofilm coating, the proposed SRI sensor is expected to have wide applications in chemical sensors and biosensors.
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[Long-term outcomes of the high vaginal uterosacral ligament suspension in treatment of the severe pelvic organ prolapse].
Zhonghua Fu Chan Ke Za Zhi
PUBLISHED: 11-09-2013
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To investigate the long-term objective and subjective outcomes of the transvaginal high uterosacral ligament suspension(HUS) in treatment of severe pelvic organ prolapse (POP) .
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Increased level of E protein activity during invariant NKT development promotes differentiation of invariant NKT2 and invariant NKT17 subsets.
J. Immunol.
PUBLISHED: 10-11-2013
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E protein transcription factors and their natural inhibitors, Id proteins, play critical and complex roles during lymphoid development. In this article, we report that partial maintenance of E protein activity during positive selection results in a change in the cell fate determination of developing iNKT cells, with a block in the development of iNKT1 cells and a parallel increase in the iNKT2 and iNKT17 subsets. Because the expression levels of the transcription factors that drive these alternative functional fates (GATA-3, ROR?T, T-bet, and Runx-3) are not altered, our results suggest that E protein activity controls a novel checkpoint that regulates the number of iNKT precursors that choose each fate.
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Temporal variations of NDVI and correlations between NDVI and hydro-climatological variables at Lake Baiyangdian, China.
Int J Biometeorol
PUBLISHED: 10-09-2013
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In this paper, correlations between vegetation dynamics (represented by the normalized difference vegetation index (NDVI)) and hydro-climatological factors were systematically studied in Lake Baiyangdian during the period from April 1998 to July 2008. Six hydro-climatological variables including lake volume, water level, air temperature, precipitation, evaporation, and sunshine duration were used, as well as extracted NDVI series data representing vegetation dynamics. Mann-Kendall tests were used to detect trends in NDVI and hydro-climatological variation, and a Bayesian information criterion method was used to detect their abrupt changes. A redundancy analysis (RDA) was used to determine the major hydro-climatological factors contributing to NDVI variation at monthly, seasonal, and yearly scales. The results were as follows: (1) the trend analysis revealed that only sunshine duration significantly increased over the study period, with an inter-annual increase of 3.6 h/year (p?
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[Three-dimensional finite element analysis of the upper cervical-defected incisor with labial access or lingual access].
Shanghai Kou Qiang Yi Xue
PUBLISHED: 10-09-2013
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To evaluate the stress distribution of the cervical-defected incisor with labial or lingual endodontic access with finite element analysis (FEA), and to explore the advantage of resistance in labial endodontic access.
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A new copper-based metal-organic framework as a promising heterogeneous catalyst for chemo- and regio-selective enamination of ?-ketoesters.
Chem. Commun. (Camb.)
PUBLISHED: 09-25-2013
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Assembly of 5-nitro-1,2,3-benzenetricarboxylic acid (H3nbta) with Cu(II) in the presence of 1,3-bis(1,2,4-triazol-1-yl)propane (1,3-btp) leads to a new metal-organic framework, [Cu(Hnbta)(1,3-btp)]·2H2O (A1), which is shown to be an efficient and recyclable heterogeneous catalyst for enamination of ?-ketoesters with excellent product yields and selectivity.
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A survey of TB knowledge among medical students in Southwest China: is the information reaching the target?
BMJ Open
PUBLISHED: 09-24-2013
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Tuberculosis (TB) control in schools is a concern in low-income and middle-income countries with high TB burdens. TB knowledge is recognised as important for TB control in China, which has one of the highest TB prevalence in the world. Accordingly, National TB Control Guideline in China emphasised TB-health education in schools as one of the core strategies for improving TB knowledge among the population. It was important to assess the level of TB knowledge in schools following 5-year implementation of the guideline, to determine whether the information was reaching the targets.
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A novel one-dimensional tubular cadmium(II) coordination polymer based on 5-(carboxylatomethoxy)benzene-1,3-dicarboxylate containing 4-aminopyridinium ions.
Acta Crystallogr C
PUBLISHED: 09-20-2013
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A novel coordination polymer, poly[4-aminopyridinium [diaqua[?3-5-(carboxylatomethoxy)benzene-1,3-dicarboxylato]cadmium(II)] dihydrate], {(C5H7N2)[Cd(C10H5O7)(H2O)2]·2H2O}n or {(HpAPy)[Cd(OABDC)(H2O)2]·2H2O}n [HpAPy is 4-aminopyridinium and H3OABDC is 5-(carboxymethoxy)benzene-1,3-dicarboxylic acid], was synthesized under hydrothermal conditions. Single-crystal analysis revealed that the anionic complex has a centrosymmetric one-dimensional tubular arrangement. The pyridine N atom of the 4-aminopyridine molecule is protonated and this cation balances the charge of the tubular anionic coordination polymer. Neighbouring tubes are crosslinked into a three-dimensional framework through multiple hydrogen bonds involving solvent water molecules and OABDC(3-) ligands.
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New Method for the Simultaneous Analysis of Types A and B Trichothecenes by Ultrahigh-Performance Liquid Chromatography Coupled with Tandem Mass Spectrometry in Potato Tubers Inoculated with Fusarium sulphureum.
J. Agric. Food Chem.
PUBLISHED: 09-19-2013
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A reliable and sensitive method for rapid simultaneous determination of two type A (T-2 and diacetoxyscirpenol) and two type B (3-acetyldeoxynivalenol and Fusarenon X) trichothecenes was developed and successfully applied for detecting trichothecenes in potato tubers by ultrahigh-performance liquid chromatography coupled with tandem mass spectrometry. The established method was further evaluated by determining the linearity (R ? 0.9995), recovery (113.28-77.97%), precision (relative standard deviation ? 5.89), and sensitivity (limit of detection, 0.002-0.005 ?g/g; limit of quantitation, 0.005-0.015 ?g/g). The method proved to be suitable for simultaneous determination of T-2, diacetoxyscirpenol, 3-acetyldeoxynivalenol, and Fusarenon X in potato tubers inoculated with Fusarium sulphureum . In addition, it was found that T-2, diacetoxyscirpenol, 3-acetyldeoxynivalenol, and Fusarenon X could be predominantly detected in the lesion, and the toxin could also be identified in tubers without any disease symptoms. The experimental results also indicated that the concentration of toxin in the susceptible cultivar (Longshu No. 3) was significantly higher than that in the resistant cultivar (Longshu No. 6).
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Human dopamine transporter gene: differential regulation of 18-kb haplotypes.
Pharmacogenomics
PUBLISHED: 09-13-2013
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Since previous functional studies of short haplotypes and polymorphic sites of SLC6A3 have shown variant-dependent and drug-sensitive promoter activity, this study aimed to understand whether a large SLC6A3 regulatory region, containing these small haplotypes and polymorphic sites, can display haplotype-dependent promoter activity in a drug-sensitive and pathway-related manner.
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[Treatment of sixty-one patients with coronary slow flow phenomenon by yiqi huoxue recipe combined Western drugs: a clinical research].
Zhongguo Zhong Xi Yi Jie He Za Zhi
PUBLISHED: 08-29-2013
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To observe the clinical efficacy of treating patients with coronary slow flow phenomenon by Yiqi Huoxue Recipe (YHR) combined Western drugs, thus providing clinical evidence for further studies.
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National surveillance of methicillin-resistant Staphylococcus aureus in China highlights a still-evolving epidemiology with 15 novel emerging multilocus sequence types.
J. Clin. Microbiol.
PUBLISHED: 08-28-2013
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The global spread of methicillin-resistant Staphylococcus aureus (MRSA) is a serious problem, particularly in mainland China. In order to better understand the national molecular epidemiology and resistance profiles of hospital-associated MRSA (HA-MRSA) in China, a laboratory-based multicenter surveillance study was conducted. Sixty-nine hospitals in 45 large cities in 27 provinces were involved, and a total of 1,141 HA-MRSA isolates were collected during the 6-month study period in 2011. All MRSA isolates were characterized by multilocus sequence typing (MLST), staphylococcal cassette chromosome mec (SCCmec) typing, spa typing, detection of the Panton-Valentine leukocidin (PVL) locus (lukS-PV and lukF-PV), and antibiogram analysis. ST239-III-t030, ST239-III-t037, and ST5-II-t002 were the predominant HA-MRSA clones (overall prevalence rates, 57.1%, 12.9%, and 8.1%, respectively), although the prevalence rates of these major clones varied markedly in different administrative regions. Of note, 6.6% of the HA-MRSA isolates were found to belong to ST59, which had typical community-associated MRSA (CA-MRSA) features, including carriage of SCCmec type IV or V and PVL and less antimicrobial resistance than other major HA-MRSA clones. Moreover, among 36 MLST sequence types (STs) identified, 15 STs, accounting for 3.5% of total isolates, were novel. A novel ST designated ST2590, which is a single-locus variant of ST5-II-t002, was identified in three hospitals in two large cities, with a total of 17 isolates. To further monitor trends in HA-MRSA prevalence, epidemic clonal shifts, clone emergence, and transmission between community and health care settings, longitudinal national MRSA surveillance is required.
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Laboratory findings in patients with avian-origin influenza A (H7N9) virus infections.
J. Med. Virol.
PUBLISHED: 08-21-2013
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Reports describing the laboratory findings associated with human H7N9 infections are limited. In this study, the laboratory findings of 39 patients with confirmed H7N9 infection were analyzed retrospectively. Patients were enrolled following admission to The First Affiliated Hospital, College of Medicine, Zhejiang University, the primary hospital for the treatment of patients with H7N9 infections in Zhejiang province in China between March and April in 2013. Hematological abnormalities included leukopenia, lymphopenia, thrombocytopenia with prolonged prothrombin time (PT) and activated partial thromboplastin time (APTT) as well as elevation of D-dimer levels. Biochemical abnormalities included elevated serum lactate dehydrogenase (LDH), aspartate aminotransferase (AST), creatine kinase (CK), alanine aminotransferase (ALT) activities, and increased C-reactive protein (CRP) concentration, as well as hyponatremia, hypokalemia, hypocalcemia, hypoproteinemia, and hypoalbuminemia. Arterial blood gas analysis revealed reduced arterial oxygen (PaO2 ) and carbon dioxide pressures (PaCO2 ). The data obtained in this study indicate that such abnormal laboratory features exhibited during the early stage of infection are common but not pathognomonic for the novel avian-origin influenza A strain H7N9; therefore, these features do not to allow the definitive differentiation of H7N9 infection from those of other viruses. J. Med. Virol. © 2013 Wiley Periodicals, Inc.
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Cytocompatibility, osseointegration, and bioactivity of three-dimensional porous and nanostructured network on polyetheretherketone.
Biomaterials
PUBLISHED: 07-30-2013
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Porous biomaterials with the proper three-dimensional (3D) surface network can enhance biological functionalities especially in tissue engineering, but it has been difficult to accomplish this on an important biopolymer, polyetheretherketone (PEEK), due to its inherent chemical inertness. In this study, a 3D porous and nanostructured network with bio-functional groups is produced on PEEK by sulfonation and subsequent water immersion. Two kinds of sulfonation-treated PEEK (SPEEK) samples, SPEEK-W (water immersion and rinsing after sulfonation) and SPEEK-WA (SPEEK-W with further acetone rinsing) are prepared. The surface characteristics, in vitro cellular behavior, in vivo osseointegration, and apatite-forming ability are systematically investigated by X-ray photoelectron spectroscopy, Fourier-transform infrared spectroscopy, scanning electron microscopy, cell adhesion and cell proliferation assay, real-time RT-PCR analysis, micro-CT evaluation, push-out tests, and immersion tests. SPEEK-WA induces pre-osteoblast functions including initial cell adhesion, proliferation, and osteogenic differentiation in vitro as well as substantially enhanced osseointegration and bone-implant bonding strength in vivo and apatite-forming ability. Although SPEEK-W has a similar surface morphology and chemical composition as SPEEK-WA, its cytocompatibility is inferior due to residual sulfuric acid. Our results reveal that the pre-osteoblast functions, bone growth, and apatite formation on the SPEEK surfaces are affected by many factors, including positive effects introduced by the 3D porous structure and SO3H groups as well as negative ones due to the low pH environment. Surface functionalization broadens the use of PEEK in orthopedic implants.
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In vivo stimulation of bone formation by aluminum and oxygen plasma surface-modified magnesium implants.
Biomaterials
PUBLISHED: 07-28-2013
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A newly developed magnesium implant is used to stimulate bone formation in vivo. The magnesium implant after undergoing dual aluminum and oxygen plasma implantation is able to suppress rapid corrosion, leaching of magnesium ions, as well as hydrogen gas release from the biodegradable alloy in simulated body fluid (SBF). No released aluminum is detected from the SBF extract and enhanced corrosion resistance properties are confirmed by electrochemical tests. In vitro studies reveal enhanced growth of GFP mouse osteoblasts on the aluminum oxide coated sample, but not on the untreated sample. In addition to that a small amount (50 ppm) of magnesium ions can enhance osteogenic differentiation as reported previously, our present data show a low concentration of hydrogen can give rise to the same effect. To compare the bone volume change between the plasma-treated magnesium implant and untreated control, micro-computed tomography is performed and the plasma-treated implant is found to induce significant new bone formation adjacent to the implant from day 1 until the end of the animal study. On the contrary, bone loss is observed during the first week post-operation from the untreated magnesium sample. Owing to the protection offered by the Al2O3 layer, the plasma-treated implant degrades more slowly and the small amount of released magnesium ions stimulate new bone formation locally as revealed by histological analyses. Scanning electron microscopy discloses that the Al2O3 layer at the bone-implant interface is still present two months after implantation. In addition, no inflammation or tissue necrosis is observed from both treated and untreated implants. These promising results suggest that the plasma-treated magnesium implant can stimulate bone formation in vivo in a minimal invasive way and without causing post-operative complications.
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Enhanced antimicrobial properties, cytocompatibility, and corrosion resistance of plasma-modified biodegradable magnesium alloys.
Acta Biomater
PUBLISHED: 07-22-2013
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Magnesium alloys are potential biodegradable materials and have received increasing attention due to their outstanding biological performance and mechanical properties. However, rapid degradation in the physiological environment and potential toxicity limit clinical applications. Recently, special magnesium-calcium (Mg-Ca) and magnesium-strontium (Mg-Sr) alloys with biocompatible chemical compositions have been reported, but the rapid degradation still does not meet clinical requirements. In order to improve the corrosion resistance, a rough, hydrophobic and ZrO2-containing surface film is fabricated on Mg-Ca and Mg-Sr alloys by dual zirconium and oxygen ion implantation. Weight loss measurements and electrochemical corrosion tests show that the corrosion rate of the Mg-Ca and Mg-Sr alloys is reduced appreciably after surface treatment. A systematic investigation of the in vitro cellular response and antibacterial capability of the modified binary magnesium alloys is performed. The amounts of adherent bacteria on the Zr-O-implanted and Zr-implanted samples diminish remarkably compared to the unimplanted control. In addition, significantly enhanced cell adhesion and proliferation are observed from the Zr-O-implanted sample. The results suggest that dual zirconium and oxygen ion implantation, which effectively enhances the corrosion resistance, in vitro biocompatibility and antimicrobial properties of Mg-Ca and Mg-Sr alloys, provides a simple and practical means to expedite clinical acceptance of biodegradable magnesium alloys.
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Rare-earth-incorporated polymeric vector for enhanced gene delivery.
Biomaterials
PUBLISHED: 07-16-2013
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Cationic polymer PEI-CyD is doped with Nd by plasma technology to produce the gene vector: Nd@PEI-CyD. Luciferase expression and EGFP transfection experiments performed in vitro reveal that Nd@PEI-CyD has significantly higher transfection efficiency than lipofectamine 2000 and PEI-CyD and the mechanism is studied and proposed. The rare-earth element, Nd, stimulates the energy metabolism of cells, enhances cell uptake of complexes/pDNA, and regulates the cellular pathways. These special features suggest a new strategy involving metal-incorporated non-viral gene vectors.
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TEMPORARY REMOVAL: SLC6A3 is a risk factor for Parkinsons disease: A meta-analysis of sixteen years studies.
Neurosci. Lett.
PUBLISHED: 06-26-2013
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The publisher regrets that this article has been temporarily removed. A replacement will appear as soon as possible in which the reason for the removal of the article will be specified, or the article will be reinstated. The full Elsevier Policy on Article Withdrawal can be found at http://www.elsevier.com/locate/withdrawalpolicy.
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