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Circular Dichroism: A change from planar to elliptic polarization when an initially plane-polarized light wave traverses an optically active medium. (McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)
 JoVE Engineering

Sputter Growth and Characterization of Metamagnetic B2-ordered FeRh Epilayers

1School of Physics and Astronomy, University of Leeds, 2Institute of Materials Research, University of Leeds, 3School of Chemistry, University of Edinburgh, 4Department of Chemical Engineering, Northeastern University, 5Department of Physics, Northeastern University


JoVE 50603

 JoVE Engineering

Controlling the Size, Shape and Stability of Supramolecular Polymers in Water

1Organic Chemistry Institute and CeNTech, Westfälische Wilhelms-Universität Münster, 2Laboratory of Macromolecular and Organic Chemistry, Institute for Complex Molecular Systems, Eindhoven University of Technology, 3Laboratory of Materials and Interface Chemistry and Soft Matter Research Unit, Department of Chemical Engineering and Chemistry, Eindhoven University of Technology


JoVE 3975

 JoVE In-Press

Single-molecule Manipulation of G-quadruplexes by Magnetic Tweezers

1School of Pharmacy, Tongji Medical College, Huazhong University of Science and Technology, 2Mechanobiology Institute, National University of Singapore, 3Department of Physics, National University of Singapore, 4Research Institute for Biomimetics and Soft Matter, Fujian Provincial Key Lab for Soft Functional Materials Research, Department of Physics, Xiamen University, 5Center for Bioimaging Sciences, National University of Singapore

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JoVE 56328

 JoVE Biology

Efficient Mammalian Cell Expression and Single-step Purification of Extracellular Glycoproteins for Crystallization

1Molecular Microbiology and Microbial Pathogenesis Program, Washington University School of Medicine, 2Department of Internal Medicine, Washington University School of Medicine, 3Drug Discovery Program in Pulmonary and Critical Care Medicine, Washington University School of Medicine, 4Biochemistry Program, Washington University School of Medicine, 5Center for the Investigation of Membrane Excitability Diseases, Washington University School of Medicine, 6Department of Biochemistry and Molecular Biophysics, Washington University School of Medicine, 7Department of Cell Biology and Physiology, Washington University School of Medicine


JoVE 53445

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 Science Education: Essentials of Physics II

Electric Charge in a Magnetic Field

JoVE Science Education

Source: Andrew Duffy, PhD, Department of Physics, Boston University, Boston, MA

This experiment duplicates J.J. Thomson's famous experiment at the end of the 19th century, in which he measured the charge-to-mass ratio of the electron. In combination with Robert A. Millikan's oil-drop experiment a few years later that produced a value for the charge of the electron, the experiments enabled scientists to find, for the first time, both the mass and the charge of the electron, which are key parameters for the electron. Thomson was not able to measure the electron charge or the electron mass separately, but he was able to find their ratio. The same is true for this demonstration; although here there is the advantage of being able to look up the values for the magnitude of the charge on the electron(e) and the mass of the electron (me), which are now both known precisely.

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