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Complex Mixtures: Mixtures of many components in inexact proportions, usually natural, such as Plant extracts; Venoms; and Manure. These are distinguished from Drug combinations which have only a few components in definite proportions.

Removal of Trace Elements by Cupric Oxide Nanoparticles from Uranium In Situ Recovery Bleed Water and Its Effect on Cell Viability

1Division of Physical Therapy, Department of Orthopedics & Rehabilitation, University of New Mexico, 2Department of Ecosystem Science and Management, University of Wyoming, 3School of Pharmacy, University of Wyoming, 4Department of Environmental and Radiological Health Sciences, Colorado State University, 5Center for Environmental Medicine, Colorado State University, 6College of Pharmacy, California Northstate University

JoVE 52715


 Environment

Synthesis and Bioconjugation of Thiol-Reactive Reagents for the Creation of Site-Selectively Modified Immunoconjugates

1Department of Chemistry, Hunter College of the City University of New York, 2Ph.D. Program in Chemistry, Graduate Center of the City University of New York, 3Department of Radiology, Memorial Sloan Kettering Cancer Center, 4Department of Radiology, Weill Cornell Medical College

JoVE 59063


 Chemistry

Leaf Spray Mass Spectrometry: A Rapid Ambient Ionization Technique to Directly Assess Metabolites from Plant Tissues

1Department of Horticultural Science, Microbial and Plant Genomics Institute, University of Minnesota, 2Department of Horticultural Science, Department of Plant and Microbial Biology, Microbial and Plant Genomics Institute, University of Minnesota, 3Department of Botany and Zoology, Stellenbosch University

JoVE 57949


 Biochemistry

A Protein Microarray Assay for Serological Determination of Antigen-specific Antibody Responses Following Clostridium difficile Infection

1Breast Surgery Group, Division of Medical Sciences and Graduate Entry Medicine, School of Medicine, Queen's Medical Centre, University of Nottingham, 2Medical Microbiology and Immunology Department, Faculty of Medicine, Mansoura University, 3Nottingham Digestive Diseases Centre and NIHR Nottingham Digestive Diseases Biomedical Research Centre, School of Medicine, Queen's Medical Centre, University of Nottingham

JoVE 57399


 Immunology and Infection

Empirical, Metagenomic, and Computational Techniques Illuminate the Mechanisms by which Fungicides Compromise Bee Health

1Vegetable Crop Research Unit, USDA-ARS, 2Department of Entomology, University of Wisconsin-Madison, 3Department of Horticulture, University of Wisconsin-Madison, 4Instituto Nacional de Investigaciones Forestales, Agricolas y Pecuarias, 5Department of Bacteriology, University of Wisconsin-Madison, 6Laboratory of Genetics, Genome Center of Wisconsin, 7DOE Great Lakes Bioenergy Research Center, Wisconsin Energy Institute, 8J.F. Crow Institute for the Study of Evolution, University of Wisconsin-Madison

JoVE 54631


 Environment

Purification of Transcripts and Metabolites from Drosophila Heads

1Department of Neurology, McKnight Brain Institute, University of Florida, 2Department of Entomology and Nematology, University of Florida, 3Genetics Institute, Department of Molecular Genetics and Microbiology, University of Florida, 4McKnight Brain Institute, Department of Neuroscience, Genetics Institute, Center for Translational Research on Neurodegenerative Diseases, and Center for Movement Disorders and Neurorestoration, University of Florida

JoVE 50245


 Biology

Sample Preparation for Analytical Characterization

JoVE 10205

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


Sample preparation is the way in which a sample is treated to prepare for analysis. Careful sample preparation is critical in analytical chemistry to accurately generate either a standard or unknown sample for a chemical measurement. Errors in analytical chemistry…


 Analytical Chemistry

Method of Standard Addition

JoVE 10201

Source: Laboratory of Dr. Paul Bower - Purdue University


The method of standard additions is a quantitative analysis method, which is often used when the sample of interest has multiple components that result in matrix effects, where the additional components may either reduce or enhance the analyte absorbance signal. That results in…


 Analytical Chemistry

Gas Chromatography (GC) with Flame-Ionization Detection

JoVE 10187

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


Gas chromatography (GC) is used to separate and detect small molecular weight compounds in the gas phase. The sample is either a gas or a liquid that is vaporized in the injection port. Typically, the compounds analyzed are less than 1,000 Da, because it is difficult to…


 Analytical Chemistry

Determining the Mass Percent Composition in an Aqueous Solution

JoVE 10172

Source: Laboratory of Dr. Neal Abrams — SUNY College of Environmental Science and Forestry


Determining the composition of a solution is an important analytical and forensic technique. When solutions are made with water, they are referred to as being aqueous, or containing water. The primary component of a solution is referred to as…


 General Chemistry

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 …


 Earth Science

Overview of Biosensing

JoVE 5794

Biosensors are devices that use a wide range of biological processes and physical properties in order to detect either a biological molecule, such as a protein or cell, or a non-biological molecule, such as a chemical component or contaminant. This interdisciplinary field utilizes electrical, optical, electrochemical, or even mechanical properties to detect the presence…


 Bioengineering

Two-Dimensional Gel Electrophoresis

JoVE 5686

Two-dimensional gel electrophoresis (2DGE) is a technique that can resolve thousands of biomolecules from a mixture. This technique involves two distinct separation methods that have been coupled together: isoelectric focusing (IEF) and sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE). This physically separates compounds across two axes of a gel by their isoelectric points…


 Biochemistry

Magnetic Resonance Spectroscopy of live Drosophila melanogaster using Magic Angle Spinning

1NMR Surgical Laboratory, Department of Surgery, Massachusetts General Hospital, Harvard Medical School, 2Shriners Burn Institute, 3Department of Radiology, Athinoula A. Martinos Center of Biomedical Imaging, Harvard Medical School, 4Molecular Surgery Laboratory, Department of Surgery, Massachusetts General Hospital, Harvard Medical School

JoVE 1710


 Neuroscience

Single-throughput Complementary High-resolution Analytical Techniques for Characterizing Complex Natural Organic Matter Mixtures

1Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, 2Department of Soil, Water and Environmental Science, University of Arizona, 3Department of Earth Ocean and Atmospheric Sciences, Florida State University, 4Bruker Daltonics Inc., 5Biological Sciences Division, Pacific Northwest National Laboratory

JoVE 59035


 Environment

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