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Intervertebral Disc: Any of the 23 plates of fibrocartilage found between the bodies of adjacent Vertebrae.
 JoVE Bioengineering

Parallel-plate Flow Chamber and Continuous Flow Circuit to Evaluate Endothelial Progenitor Cells under Laminar Flow Shear Stress

1Department of Surgery, Duke University Medical Center, 2Department of Biomedical Engineering, Duke University, 3School of Medicine, University of Pennsylvania, 4Department of Medicine, Division of Cardiology, Duke University Medical Center


JoVE 3349

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 JoVE Bioengineering

Fully Automated Centrifugal Microfluidic Device for Ultrasensitive Protein Detection from Whole Blood

1Department of Biomedical Engineering, School of Life Sciences, Ulsan National Institute of Science and Technology (UNIST), UNIST-gil 50, Ulsan, Republic of Korea, 2Current Affiliation is Agency for Defense Development (ADD), Daejeon, Republic of Korea, 3Current Affiliation is KOGAS (Korea Gas Corporation) Research Institute, Daegu, Republic of Korea, 4Center for Soft and Living Matter, Institute for Basic Science (IBS), UNIST-gil 50, Ulsan, Republic of Korea


JoVE 54143

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 Science Education: Essentials of Physical Examinations II

Ophthalmoscopic Examination

JoVE Science Education

Source: Richard Glickman-Simon, MD, Assistant Professor, Department of Public Health and Community Medicine, Tufts University School of Medicine, MA

The simplest ophthalmoscopes consist of an aperture to look through, a diopter indicator, and a disc for selecting lenses. The ophthalmoscope is primarily used to examine the fundus, or the inner wall of the posterior eye, which consists of the choroid, retina, fovea, macula, optic disc, and retinal vessels (Figure 1). The spherical eyeball collects and focuses light on the neurosensory cells of the retina. Light is refracted as it passes sequentially through the cornea, the lens, and the vitreous body. The first landmark observed during the funduscopic exam is the optic disc, which is where the optic nerve and retinal vessels enter the back of the eye (Figure 2). The disc usually contains a central whitish physiologic cup where the vessels enter; it normally occupies less than half the diameter of the entire disc. Just lateral and slightly inferior is the fovea, a darkened circular area that demarcates the point of central vision. Around this is the macula. A blind spot approximately 15° temporal to the line of gaze results from a lack of photoreceptor cells at the optic disc.

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 Science Education: Essentials of Environmental Science

Carbon and Nitrogen Analysis of Environmental Samples

JoVE Science Education

Source: Laboratories of Margaret Workman and Kimberly Frye - Depaul University

Elemental Analysis is a method used to determine elemental composition of a material. In environmental samples such as soils, scientists are particularly interested in the amounts of two ecologically important elements, nitrogen and carbon. Elemental analysis by the flash combustion technique works by oxidizing the sample with a catalyst through combustion in a high-temperature chamber. The products of combustion are then reduced to N2 and CO2 and detected with a thermal conductivity detector. Unlike other methods for total nitrogen determination (Kjeldahl method) and total carbon determination (Walkley-Black, Heanes or Leco methods), the flash combustion technique does not use toxic chemicals and is therefore much safer to use. This video will demonstrate combustion-based elemental analysis using the Flash EA 1112 instrument from Thermo Fisher Scientific.

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 JoVE Engineering

Capillary-based Centrifugal Microfluidic Device for Size-controllable Formation of Monodisperse Microdroplets

1Department of Computational Intelligence and Systems Science, Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology, 2Graduate School of Bioscience and Biotechnology, Tokyo Institute of Technology, 3Department of Mechanical Engineering, Keio University, 4PRESTO, Japan Science and Technology Agency


JoVE 53860

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 JoVE Biology

High-Throughput, Multi-Image Cryohistology of Mineralized Tissues

1Department of Reconstructive Sciences, University of Connecticut Health Center, 2Department of Computer Science and Engineering, University of Connecticut, 3Department of Orthopaedic Surgery, University of Connecticut Health Center, 4Department of Orthopaedics, University of Rochester


JoVE 54468

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 JoVE Medicine

Fundus Photography as a Convenient Tool to Study Microvascular Responses to Cardiovascular Disease Risk Factors in Epidemiological Studies

1Environmental Risk and Health, Flemish Institute for Technological Research (VITO), 2Centre for Environmental Sciences, Hasselt University, 3Transportation Research Institute, Hasselt University, 4Department of Public Health, Occupational and Environmental Medicine, Leuven University


JoVE 51904

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 JoVE Medicine

Quantification of the Immunosuppressant Tacrolimus on Dried Blood Spots Using LC-MS/MS

1iC42 Clinical Research and Development, University of Colorado, Anschutz Medical Campus, 2Division of Clinical Pharmacology, Cincinnati Children's Hospital Medical Center, 3Food and Drug Administration (FDA), Center of Drug Evaluation Research - Office of Generic Drugs, 4Transplant Clinical Research, University of Cincinnati


JoVE 52424

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 Science Education: Essentials of Environmental Science

Soil Nutrient Analysis: Nitrogen, Phosphorus, and Potassium

JoVE Science Education

Source: Laboratories of Margaret Workman and Kimberly Frye - Depaul University

In this experiment, three soil macronutrients are chemically extracted, combined with color-based reagents, then analyzed using color to determine the nutrient concentration present in the soil sample.

Nitrogen, phosphorus, and potassium are the main components of soil fertilizer. These methods isolate each nutrient from the soil into a solution that can be analyzed using turbidity and color to determine the concentration of nutrients present in the soil sample. Knowing present concentration informs environmental scientists of a nutrient deficiency or surplus in soils used to support plant production, and also provides general insight into basic biogeochemical cycles of an ecosystem.

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