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Hooke's law, a pivotal principle in material science, establishes that the strain a material undergoes is directly proportional to the applied stress, defined by a factor called the modulus of elasticity or Young's modulus.
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There are two ways to determine the amount of heat involved in a chemical change: measure it experimentally, or calculate it from other experimentally determined enthalpy changes. Some reactions are difficult, if not impossible, to investigate and make accurate measurements for experimentally. And even when a reaction is not hard to perform or measure, it is convenient to be able to determine the heat involved in a reaction without having to perform an experiment.
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All ortho–para directors, excluding halogens, are activating groups. These groups donate electrons to the ring, making the ring carbons electron-rich. Consequently, the reactivity of the aromatic ring towards electrophilic substitution increases. For instance, the nitration of anisole is about 10,000 times faster than the nitration of benzene. The electron-donating effect of the methoxy group in anisole activates the ortho and para positions on the ring and stabilizes the corresponding...
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Many materials exhibit a simple relationship between the values of current, voltage, and resistance, known as Ohm’s law. The current that flows through most substances is directly proportional to the voltage applied to them. The German physicist Georg Simon Ohm (1787–1854) was the first to demonstrate experimentally that the current in a metal wire is directly proportional to the voltage applied. Any material, component, or device that obeys Ohm’s law, where the current...
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Proboscis Extension Response PER Assay in Drosophila
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In Reply to Ho

Rebecca K Tsevat1, Anoushka A Sinha, Kevin J Gutierrez

  • 1Medical student, Columbia University College of Physicians and Surgeons, New York, New York; rkt2112@cumc.columbia.edu. Medical student, Columbia University College of Physicians and Surgeons, New York, New York. Medical student, Sidney Kimmel Medical College of Jefferson University, Philadelphia, Pennsylvania. Faculty, Master's Program in Narrative Medicine, Institute for Comparative Literature and Society, Center for the Study of Ethnicity and Race, Columbia University, New York, New York.

Academic Medicine : Journal of the Association of American Medical Colleges
|February 25, 2016
PubMed
Summary

No abstract available in PubMed .

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