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Dimethyl Sulfoxide: A highly polar organic liquid, that is used widely as a chemical solvent. Because of its ability to penetrate biological membranes, it is used as a vehicle for topical application of pharmaceuticals. It is also used to protect tissue during Cryopreservation. Dimethyl sulfoxide shows a range of pharmacological activity including analgesia and anti-inflammation.
 JoVE Biology

Identification of Intracellular Signaling Events Induced in Viable Cells by Interaction with Neighboring Cells Undergoing Apoptotic Cell Death

1Section of Nephrology, Department of Medicine, University of Illinois at Chicago, 2Section of Nephrology, Department of Medicine, Jesse Brown Veterans Affairs Medical Center, 3Department of Biology, Kutztown University of Pennsylvania, 4Division of Rheumatology, Department of Medicine, Research Institute of the McGill University Health Centre, 5Department of Microbiology & Immunology, University of Illinois at Chicago


JoVE 54980

 JoVE In-Press

Preparation of Giant Vesicles Exhibiting Visible-light-induced Morphological Changes

1Department of Applied Chemistry, School of Applied Science, National Defense Academy of Japan, 2Department of Applied Physics, School of Applied Science, National Defense Academy of Japan, 3Department of Materials Science and Technology, Faculty of Engineering, Niigata University

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JoVE 54817

 JoVE Bioengineering

Using Synthetic Biology to Engineer Living Cells That Interface with Programmable Materials

1Department of Mechanical Engineering, Carnegie Mellon University, 2Engineering Science and Mechanics Program, Virginia Polytechnic Institute and State University, 3Department of Biological Systems Engineering, Virginia Polytechnic Institute and State University, 4Department of Bioengineering, University of Pittsburgh


JoVE 55300

 JoVE Biology

High Efficiency Differentiation of Human Pluripotent Stem Cells to Cardiomyocytes and Characterization by Flow Cytometry

1Department of Biochemistry, Medical College of Wisconsin, 2Stanford Cardiovascular Institute, Stanford University School of Medicine, 3Department of Anesthesiology, Medical College of Wisconsin, 4Stem Cell and Regenerative Medicine Consortium, LKS Faculty of Medicine, Hong Kong University, 5Division of Cardiology, Johns Hopkins University School of Medicine, 6Cardiovascular Research Center, Biotechnology and Bioengineering Center, Medical College of Wisconsin


JoVE 52010

 JoVE Bioengineering

Polyelectrolyte Complex for Heparin Binding Domain Osteogenic Growth Factor Delivery

1Department of Orthopaedic Surgery, Yong Loo Lin School of Medicine, National University of Singapore, 2Centre for Research in Medical Devices (CÚRAM), National University of Ireland Galway, 3Department of Bioengineering, Faculty of Engineering, National University of Singapore, 4Tissue Engineering Program, National University of Singapore, 5Department of Orthopaedic Surgery and the Orthopaedic Hospital Research Center, University of California, Los Angeles


JoVE 54202

 JoVE Immunology and Infection

Measurement of T Cell Alloreactivity Using Imaging Flow Cytometry

1Division of Respirology, Departments of Medicine and Immunology, Toronto Lung Transplant Program, Multiorgan Transplant Program, Toronto General Research Institute, University of Toronto and University Health Network, 2Latner Thoracic Surgery Laboratories, Toronto General Research Institute, University Health Network, 3National Institutes of Health Research, Oxford Biomedical Research Centre, Translational Immunology Laboratory, NDORMS, Kennedy Institute of Rheumatology, University of Oxford, 4Transplantation Research Immunology Group, Nuffield Department of Surgical Sciences, John Radcliffe Hospital, University of Oxford


JoVE 55283

 JoVE Developmental Biology

Isolation and Cryopreservation of Neonatal Rat Cardiomyocytes

1Department of Molecular Biomedical Sciences and Center for Comparative Medicine and Translational Research, College of Veterinary Medicine, North Carolina State University, 2Joint Department of Biomedical Engineering, University of North Carolina at Chapel Hill, North Carolina State University, 3The Cyrus Tang Hematology Center, Soochow University


JoVE 52726

 Science Education: Essentials of Analytical Chemistry

Internal Standards

JoVE Science Education

Source: Laboratory of Dr. B. Jill Venton - University of Virginia

The goal of many chemical analyses is a quantitative analysis, where the amount of a substance in a sample is determined. In order to accurately calculate the concentration of an unknown from a sample, careful sample preparation is key. Every time a sample is handled or transferred, some of the sample can be lost. There are strategies however, for minimizing sample loss. There are also strategies for coping with sample loss and still making accurate measurements of concentration. To minimize sample loss, the ideal is to minimize the number of sample handling and transfer steps. For example, massing a solid sample directly into a flask that a solution will be made in reduces a transfer step. If it's necessary to transfer from one flask to another and a dilution is being made, then triple rinsing the glassware helps ensure all the sample is transferred. Other strategies are more specific to the sample. For example, samples that adsorb to glass, such as proteins, might better be handled in polypropylene disposable tubes. The tubes are not hydrophilic, so if a small amount of sample is to be pipetted in water, it is best to have already added the water to the tube, so the sample can be pipetted directly into the solve

 JoVE Medicine

Rapid Fractionation and Isolation of Whole Blood Components in Samples Obtained from a Community-based Setting

1Carl R. Woese Institute for Genomic Biology, University of Illinois at Urbana-Champaign, 2Department of Molecular and Integrative Physiology, University of Illinois at Urbana-Champaign, 3Department of Epidemiology, Gillings School of Global Public Health, University of North Carolina, 4Department of Psychology, University of Illinois at Urbana-Champaign, 5Department of Epidemiology, Mailman School of Public Health, Columbia University, 6Department of Epidemiology, University of Michigan School of Public Health, 7Center for Molecular Medicine and Genetics, Wayne State University School of Medicine


JoVE 52227

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