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Neurogeneticist Moalem takes us on a trip from prehistory to the forefront of cutting-edge medical research, and through a bedroom or two, to tell the story of how human sexuality has developed over time. This book challenges common perceptions about our bodies and presents astonishing discoveries from the frontiers of science as it traces the transformation of sex across species and through time to its current role in human societies. Find out the...
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"An eye-opening look into why our bodies work--or don't--the way they do. From blurry vision, to crooked teeth, ACLs that tear at alarming rates, and spines that seem to spend a lifetime falling apart, it's a curious thing that human beings have beaten the odds as a species. After all, we're the only survivors on our branch of the tree of life. Why is it that human mothers have such a life-endangering experience giving birth? And why are there entire...
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Using computer graphics, this program illustrates the difference between monoclonal and polyclonal antibodies. It describes how lymphocytes in the bloodstream respond to the appearance of an antigen by producing antibodies to it. Problems with antibodies from the blood are discussed along with Milstein's solution. A step-by-step procedure to obtain stable hybridomas, a hybrid cell produced by the fusion of an antibody-producing lymphocyte with a tumor...
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This program explains the principles of southern blotting, a technique used to create a visible picture of DNA that can be used in research. The viewer will follow the step-by-step process from separation of the DNA bands to fixing the image on film and the final arranging of the DNA fragments as separate bands. Five DNA samples are compared using this technique, one that is normal and four from patients with neurological disease.
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This in-depth program shows how fibroblasts from the skin are isolated by using enzymes and then cultured in a nutrient medium. Detailed explanations of how cells can be re-seeded, counted, and cryopreserved for storage in liquid nitrogen for long periods of time are demonstrated. The importance of careful aseptic techniques and the use of sterile equipment is discussed.
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They help to construct the human body. They drive every chemical reaction that takes place inside it. Likewise, they are manufactured by the body during the process of protein synthesis. This program studies the functions and characteristics of enzymes, among the most important proteins in our physiology. Viewers learn how enzymes are highly specific in their activity and form an enzyme-substrate complex that speeds up processes while activation energy...
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Use this video to familiarize students with the properties of acids and bases. Beginning with an overview of how these two kinds of chemicals react to or neutralize each other, the program explores Arrhenius's ideas on ion release and Lowry and Bronsted's theory of proton exchange. Details on the pH scale, indicators, conjugate bases, and Lowry-Bronsted reactions are featured along with numerous examples of acid and base applications-cleaning agents,...
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This program considers the bonds formed when atoms share electrons (covalent bonding) The idea of filling electron shells to reach a more stable state is used to explain the formation of simple molecules such as water and methane. Shapes of molecules are explained by considering the repulsion between molecular orbitals. Further shapes are illustrated using CH4, NH3, and NH4. Double bonds (O2) and triple bonds (N2) are introduced. More complex molecules...
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This program uses the fascinating setting of a circus to provide the analogy for growth. A magician creating the illusion of multiplying balls introduces micro-photography showing how cells divide and multiply. The program shows how bones are continually being built and destroyed and, in a spectacular sequence of time-lapse photography, actually captures a tooth growing-from the moment it first peeps out of the gum until it falls out.
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Can a barbershop quartet introduce the subject of stoichiometry? They do in this program, which in section one presents the Law of Conservation of Mass and how to balance equations. Section two explains the difference between the mass number and atomic mass, what an isotope is, and how to work with atomic mass units to find the average atomic mass.
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After an introductory segment on cell characteristics, this program discusses the way human body cells function and combine into the structures that sustain life. Topics include membrane permeability and the processes of passive and active transport; cytoplasm, with its cytosol, organelles, and inclusions; the constituent parts of the nucleus and the stages and processes of the cell cycle; the four basic tissue types; and the skin, the body's largest...
15) A Vital Poison
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This documentary tells the strange story of how researchers discovered that a lethal gas, nitric oxide, was central to some of the most basic functions of our bodies. The program introduces Professor John Gillespie, distinguished research scholar at the University of Glasgow in Scotland and at the Rockefeller Institute in the United States. He is featured along with Nobel laureates Bob Furchgott, Louise Ignarro, and Ferid Murad. These world-renowned...
16) Homeostasis
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Homeostasis is a state of balance inside the body. The body maintains homeostasis by controlled releases of hormones (chemicals). The release of hormones is controlled by negative feedback, much the same way a house thermostat works. When the temperature rises above a set point, or normal range, the thermostat turns on the air conditioner. When the temperature once again falls within normal range, the thermostat signals the air conditioner to turn...
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Air, an important industrial raw material, is first filtered to remove any solid matter. Then its constituent gases-nitrogen, oxygen, and other trace gases-can be separated by compressing the air, cooling it, and then allowing it to expand, which cools it further. Since each gas liquefies at a different temperature, the gases can easily be separated. As the air expands, it is used to drive turbines, which generate electricity; the cold air is also...
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Take your biology students on a tour of an unusual art museum-the "Cell Gallery." Using electron microscope images and entertaining graphics, this program walks viewers through the basic components of a cell. The tour looks in detail at the structure and function of cellular organelles, including cell membranes, nuclei, mitochondria, chloroplasts, smooth and rough endoplasmic reticula, ribosomes, lysosomes, vacuoles, cytoplasm, cytosol and cytoskeleton,...
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Two very important products derived from air are ammonia and nitric acid. Ammonia is produced when hydrogen gas is extracted from natural gas and steam, mixed with nitrogen from the air, and heated. The resulting ammonia gas is condensed into liquid form, to be made into other chemicals. Ammonia is also used to make nitric acid, basic in the production of fertilizers, detergents, and many other products. The program also discusses the role of chemical...
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What makes our bodies age has long been a scientific mystery. This program looks at discoveries suggesting that the aging process can be manipulated, if not completely switched off. Examining the role of diet, the film profiles a married couple who have maintained a low-calorie regimen for 16 years - with results that are open to interpretation - as well as two scientists who have largely debunked the myth of oxidative stress. Other researchers include...