chemical processes
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Earth & Space Science 15: Introduction to Oceanography is a class that provides a general introduction to geological, physical, chemical, and biological processes and history of Earth's global oceanic system. Edwin Schauble is an Associate Professor from UCLAs Department of Geochemistry and Astrobiology. His current area of study and collaboration include species-dependent isotopic signatures in dissolved iron, spectroscopic signatures ...more
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Early Modern England: Politics, Religion, and Society under the Tudors and Stuarts (HIST 251)Professor Wrightson reviews the consequences of the economic and population changes discussed in the last lecture. While economic shifts allowed some members of English society, especially members of the gentry and the land-holding classes, to increase their wealth, they also (coupled with an expanding population and price inflation) resulted in th...more
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Environmental Politics and Law (EVST 255) The lecture critiques the U.S. Green Building Council's (USGBC) certification system, LEED (Leadership in Energy and Environmental Design). The criteria for being highly rated under LEED emphasize energy efficiency and minimizing waste, but do not prioritize environmental health and limiting use of dangerous plastics and chemicals. USGBC is a non-profit organization, not a government agency, and...more
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Professor Diamond continues her discussion of the nervous system beginning with processes - extensions of the soma. She describes axons, dendrites and the types of synapses: axodendritic, axoaxomic, axosomatic, and dendrodentritic. She then describes how neurotransmitters travel from the presynaptic terminal of an axon to the postsynaptic terminal of a dendrite in an axodendritic synapse. Professor Diamond continues with neuron classifi...more
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Environmental Politics and Law (EVST 255) The change from smaller, more diverse farms to larger single-crop farms in the US has led to greater reliance on pesticides for pest management. Other changes as the US food system becomes more commercialized include: increased use of additives, higher food prices, more water and energy consumption for agriculture, and more pesticide residues entering food through processing. Pesticides have als...more
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The Big Bang created the physical universe. Of course life is part of this physical universe, but the immediate building blocks of life are chemicals. Before the Big Bang, words such as “time” had no meaning, but even in the first few minutes there could be no chemistry since there were no atoms. The nuclei of some of the lighter elements formed within minutes, atoms some time later, and elements heavier than lithium were forged in the sup...more
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August 21, 2008 presentation by Stacey Bent for the Stanford University Office of Science Outreach's Summer Science Lecture Series. Meeting the world's growing energy needs in a sustainable fashion is one of the most pressing problems of our time. Professor Bent introduces the scope of the energy problem and some of the options for sustainable energy, then will focus on two main devices: solar cells and fuel cells. Solar cells convert t...more
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Going back to 1998, Symantec was best known for Norton utilities and Norton anti-virus, says Thompson. When he arrived in 1999, right after windows 1998 was launched. Symantec had had a bad series of quarter. In his first 100 days, he looked at the company product portfolio and found products that were not of strategic value. The brightest star was Norton anti-virus. Symantec had viewed itself as a consumer oriented desktop software compan...more
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Professor McBride begins by using previous examples of "pathological" bonding and the BH3 molecule to illustrate how a chemist's use of localized bonds, vacant atomic orbitals, and unshared pairs to understand molecules compares with views based on the molecule's own total electron density or on computational molecular orbitals. This lecture then focuses on understanding reactivity in terms of the overlap of singly-occupied molecular orbit...more
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Professor McBride outlines the course with its goals and requirements, including the required laboratory course. To the course's prime question "How do you know" he proposes two unacceptable answers (divine and human authority), and two acceptable answers (experiment and logic). He illustrates the fruitfulness of experiment and logic using the rise of science in the seventeenth century. London's Royal Society and the "crucial" experiment o...more
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Continuing the examination of molecular orbital theory as a predictor of chemical reactivity, this lecture focuses on the close analogy among seemingly disparate organic chemistry reactions: acid-base, SN2 substitution, and E2 elimination. All these reactions involve breaking existing bonds where LUMOs have antibonding nodes while new bonds are being formed. The three-stage oxidation of ammonia by elemental chlorine is analyzed in the same...more
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Professor McBride begins by following Newton's admonition to search for the force law that describes chemical bonding. Neither direct (Hooke's Law) nor inverse (Coulomb, Gravity) dependence on distance will do - a composite like the Morse potential is needed. G. N. Lewis devised a "cubic-octet" theory based on the newly discovered electron, and developed it into a shared pair model to explain bonding. After discussing Lewis-dot notation an...more
