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Glomerular Filtration Rate: The volume of water filtered out of plasma through glomerular capillary walls into Bowman's capsules per unit of time. It is considered to be equivalent to Inulin clearance.
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 JoVE Neuroscience

Recording Temperature-induced Neuronal Activity through Monitoring Calcium Changes in the Olfactory Bulb of Xenopus laevis

1Institute of Neurophysiology and Cellular Biophysics, Georg-August-Universität Göttingen, 2Center for Nanoscale Microscopy and Molecular Physiology of the Brain, Georg-August-Universität Göttingen, 3DFG Excellence Cluster 171, Georg-August-Universität Göttingen, 4German Hearing Center Hannover


JoVE 54108

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 JoVE Developmental Biology

Stable and Efficient Genetic Modification of Cells in the Adult Mouse V-SVZ for the Analysis of Neural Stem Cell Autonomous and Non-autonomous Effects

1Cell Division and Cancer Group, Spanish National Cancer Research Centre (CNIO), 2Centro de Investigaciones Biomédicas en Red sobre Enfermedades Neurodegenerativas (CIBERNED), 3Departmento de Biologìa Celular, Universidad de Valencia, 4Institut de Biomedicina de la Universitat de Barcelona (IBUB), 5Department of Molecular and Translational Medicine, Fibroblast Reprogramming Unit, University of Brescia


JoVE 53282

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 Science Education: Essentials of Organic Chemistry

Separation of Mixtures via Precipitation

JoVE Science Education

Source: Laboratory of Dr. Ana J. García-Sáez — University of Tübingen

Most samples of interest are mixtures of many different components. Sample preparation, a key step in the analytical process, removes interferences that may affect the analysis. As such, developing separation techniques is an important endeavor not just in academia, but also in industry.  One way to separate mixtures is to use their solubility properties. In this short paper, we will deal with aqueous solutions. The solubility of a compound of interest depends on (1) ionic strength of solution, (2) pH, and (3) temperature. By manipulating with these three factors, a condition in which the compound is insoluble can be used to remove the compound of interest from the rest of the sample.1

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 JoVE Immunology and Infection

A Modified EPA Method 1623 that Uses Tangential Flow Hollow-fiber Ultrafiltration and Heat Dissociation Steps to Detect Waterborne Cryptosporidium and Giardia spp.

1National Exposure Research Laboratory, Office of Research and Development, US Environmental Protection Agency, 2Shaw Environmental & Infrastructure, 3Office of Ground Water and Drinking Water, US Environmental Protection Agency


JoVE 4177

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 JoVE Medicine

High-definition Fourier Transform Infrared (FT-IR) Spectroscopic Imaging of Human Tissue Sections towards Improving Pathology

1Department of Bioengineering, University of Illinois at Chicago, 2Department of Pathology, University of Illinois at Chicago, 3Department of Biological Sciences, University of Illinois at Chicago, 4Department of Chemistry, University of Illinois at Chicago, 5Department of Nephrology, University of Illinois at Chicago


JoVE 52332

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 Science Education: Essentials of Environmental Microbiology

Isolation of Fecal Bacteria from Water Samples by Filtration

JoVE Science Education

Source: Laboratories of Dr. Ian Pepper and Dr. Charles Gerba - Arizona University
Demonstrating Author: Luisa Ikner

The quality of water destined for use in agricultural, recreational, and domestic settings is of great importance due to the potential for outbreaks of waterborne disease. Microbial agents implicated in such events include parasites, bacteria, and viruses that are shed in high numbers in the feces of infected people and animals. Transmission to new and susceptible hosts may then occur via the fecal-oral route upon ingestion of contaminated water. Therefore, the ability to monitor water sources for the presence of pathogenic microorganisms is significant in order to ensure public health. Due to the sheer number and variety of potential fecal-oral pathogens that may be present in water and their variable concentrations, it is impractical and expensive to assay directly for each one of them on a regular basis. Therefore, the microbiological assays for water quality monitoring employ coliform indicator bacteria. Coliforms comprise, in part, the normal intestinal microflora of warm-blooded mammals, are non-pathogenic, and are consistently excreted in the feces. Therefore, the detection of coliform bacteria in water means that a fecal release occurred, and that harmful pathogenic m

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 JoVE Biology

Manual Isolation of Adipose-derived Stem Cells from Human Lipoaspirates

1Cytori Therapeutics Inc, 2Division of Cardiac Surgery, Department of Surgery, David Geffen School of Medicine at UCLA, 3Division of Plastic and Reconstructive Surgery, Department of Surgery, David Geffen School of Medicine at UCLA, 4Department of Orthopedic Surgery, David Geffen School of Medicine at UCLA, 5Regenerative Bioengineering and Repair Laboratory, David Geffen School of Medicine at UCLA


JoVE 50585

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 Science Education: Essentials of Organic Chemistry

Purifying Compounds by Recrystallization

JoVE Science Education

Source: Laboratory of Dr. Jimmy Franco - Merrimack College

Recrystallization is a technique used to purify solid compounds.1 Solids tend to be more soluble in hot liquids than in cold liquids. During recrystallization, an impure solid compound is dissolved in a hot liquid until the solution is saturated, and then the liquid is allowed to cool.2 The compound should then form relatively pure crystals. Ideally, any impurities that are present will remain in the solution and will not be incorporated into the growing crystals (Figure 1). The crystals can then be removed from the solution by filtration. Not all of the compound is recoverable — some will remain in the solution and will be lost. Recrystallization is not generally thought of as a separation technique; rather, it is a purification technique in which a small amount of an impurity is removed from a compound. However, if the solubility properties of two compounds are sufficiently different, recrystallization can be used to separate them, even if they are present in nearly equal amounts. Recrystallization works best when most impurities have already been removed by another method, such as extraction or column chromatography. Fi</span>…		</p>
		
	
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