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Lipid A: Lipid A is the biologically active component of lipopolysaccharides. It shows strong endotoxic activity and exhibits immunogenic properties.

A Lipid Extraction and Analysis Method for Characterizing Soil Microbes in Experiments with Many Samples

1Department of Agronomy and Great Lakes Bioenergy Research Center, University of Wisconsin - Madison, 2Department of Soil Science, University of Wisconsin - Madison, 3Department of Soil, Water, and Climate, University of Minnesota, 4Faculty of Science and Engineering, Curtin University

JoVE 55310


 Environment

Purification of a Total Lipid Extract with Column Chromatography

JoVE 10159

Source: Laboratory of Jeff Salacup - University of Massachusetts Amherst

The product of an organic solvent extraction, a total lipid extract (TLE), is often a complex mixture of hundreds, if not thousands, of different compounds. The researcher is often only interested in a handful of compounds. The compounds of interest may belong to one of several classes of compounds, such as alkanes, ketones, alcohols, or acids (Figure 1), and it may be useful to remove the compound classes to which it does not belong in order to get a clearer view of the compounds you are interested in. For example, a TLE may contain 1,000 compounds, but the Uk'37 sea surface temperature proxy is based on only two compounds (alkenones) and the TEX86 sea surface temperature proxy is based on only four (glycerol dialkyl glycerol tetraethers). It would behoove the researcher to remove as many of the compounds they are not interested in. This makes the instrumental analysis of the compounds of interest (alkenones or GDGTs) less likely to be complicated by other extraneous compounds. In other cases, an upstream purification technique may have produced compounds you wish to now remove from the sample, such as the production of carboxylic acids during saponification in our


 Earth Science

SNARE-mediated Fusion of Single Proteoliposomes with Tethered Supported Bilayers in a Microfluidic Flow Cell Monitored by Polarized TIRF Microscopy

1Department of Cellular and Molecular Physiology, Yale University School of Medicine, 2Nanobiology Institute, Yale University, 3Department of Molecular Biophysics and Biochemistry, Yale University, 4Laboratoire de Neurophotonique, Université Paris Descartes, Faculté des Sciences Fondamentales et Biomédicales, Centre National de la Recherche Scientifique (CNRS)

JoVE 54349


 Neuroscience

Reconstitution of a Transmembrane Protein, the Voltage-gated Ion Channel, KvAP, into Giant Unilamellar Vesicles for Microscopy and Patch Clamp Studies

1Institut Curie, Centre de Recherche, CNRS, UMR 168, PhysicoChimie Curie, Université Pierre et Marie Curie, 2Kavli Institute for Brain and Mind, University of California, San Diego, 3Molecular Physiology and Biophysics Section, National Institute for Neurological Disorders and Stroke, National Institute of Health

JoVE 52281


 Biology

Cell-free Biochemical Fluorometric Enzymatic Assay for High-throughput Measurement of Lipid Peroxidation in High Density Lipoprotein

1University of California, Los Angeles, 2Centre for Biomedical Research, Burnet Institute, 3School of Health and Biomedical Sciences, RMIT University, 4Department of Infectious Diseases, Monash University

JoVE 56325


 Immunology and Infection

Pulling Membrane Nanotubes from Giant Unilamellar Vesicles

1Laboratoire Physico Chimie Curie, Institut Curie, PSL Research University, CNRS UMR168, 2Department of Genetics and Complex Diseases, T. H. Chan School of Public Health, Harvard Medical School, 3Department of Cell Biology, Harvard Medical School, 4Sorbonne Universités, UPMC University Paris, 5Center for Studies in Physics and Biology, The Rockefeller University

Video Coming Soon

JoVE 56086


 JoVE In-Press

Multifunctional, Micropipette-based Method for Incorporation And Stimulation of Bacterial Mechanosensitive Ion Channels in Droplet Interface Bilayers

1Department of Mechanical Engineering, Virginia Polytechnic Institute and State University, 2School of Biomedical Engineering and Sciences, Virginia Polytechnic Institute and State University, 3Department of Biology, University of Maryland, 4College of Engineering, University of Georgia, 5Department of Engineering Sciences and Mechanics, Virginia Polytechnic Institute and State University

JoVE 53362


 Biology

Methods to Study Lipid Alterations in Neutrophils and the Subsequent Formation of Neutrophil Extracellular Traps

1Department of Physiological Chemistry, University of Veterinary Medicine Hannover, 2Fish Disease Research Unit, University of Veterinary Medicine, 3Department of Clinical Sciences, Biomedical Center, Lund University, 4Research Center for Emerging Infections and Zoonoses (RIZ), University of Veterinary Medicine Hannover

JoVE 54667


 Immunology and Infection

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