Heidi Schreuder-Gibson‚ US Army Soldier Systems Center‚ Natick Soldier Center‚ Natick‚ MA 4. Incorporation of Electrospun Nanofibers into Functional Structures; Kristine Graham‚ Heidi Schreuder-Gibson‚ Mark Gogins 5. Nanocomposite Fiber Based Weband Membrane Formationand Characterization‚ Sabit Adanur and Birgul Ascioglu.
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ACTIVITY 1: THE RESTING MEMBRANE POTENTIAL 1. Explain why increasing extracellular K+ reduces the net diffusion of K+ out the neuron through the K+ leak channels? When the diffusion is greater on one side‚ the other side will slow down. 2. Explain why increasing extracellular K+ causes the membrane potential to change to a less negative value. How well did the results compare with your predictions? There are two potassium’s for every sodium so the increase of potassium will make it more
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Shadish‚ Rob Harris‚ Patricia Tellekamp Water appears to cross the differentially permeable membrane of potato cells by a process called osmosis. The measure of the energy involved in osmosis is called water potential. Since water must lose energy as it moves by osmosis‚ water must move from an area of greater potential to an area of less water potential‚ until the water potential on either side of the membrane is the same‚ at which point the cell has reached equilibrium. The two major parameters influencing
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Mechanisms of Acetaminophen-lnduced Liver Necrosis By Jack A. Hinson‚ Dean W. Roberts‚ and Laura P. James Acetaminophen (paracetamol‚ N-acetyl-p-aminophenol; APAP) is widely used as analgesic and antipyretic drug. At therapeutic doses‚ acetaminophen is safe to be used. Acetaminophen other than aspirin and ibuprofen has only weak anti-inflammatory properties. At higher doses‚ acetaminophen produces a centrilobular hepatic necrosis that can be fatal. Acetaminophen-lnduced Hepatotoxicity Observation/
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in and out of the cell. The movement of substances in and out of a cell through the cell membrane is termed as transport across the membrane. Although the thickness of the cell membrane is only 5-10nm‚ it is a physical barrier to the movement of ions and molecules. The cell membrane and other membranes within a cell are all living membranes that exhibit selective permeability. A selectively permeable membrane enables molecules of certain substances to move across it freely while excluding others
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about nutrient absorption by the intestinal mucosal cells is true? a. Carbohydrates are absorbed as disaccharides. b. Fats are absorbed as fatty acids and monoglycerides. c. Amino acids move across the plasma membrane only by diffusion. d. Bile transports fats across the plasma membrane. e. Most nutrients are absorbed in the duodenum. 4. Microbial fermentation in the gut of a cow a. produces fatty acids as a major nutrient for the cow. b. occurs in specialized regions of the small intestine
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Transport Mechanisms and Permeability Name __Christopher Scott_ Lab Time/Date ___1/15/2014 Activity 1 Simulating Dialysis (Simple Diffusion) 1. Describe two variables that affect the rate of diffusion. ___ Two variables that affect rate of diffusion are molecule size and plasma membrane composition. A larger molecule will diffuse more slowly than a smaller molecule. The lipid content of the plasma membrane determines permeability of certain molecules. A plasma membrane with a higher lipid content
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Gabriela Rios-Martinez March 1‚ 2014 BIO 141 Exam 1 Study Questions Chapter 1: Biology and the Tree of Life (#1 – 4) 1. What is the difference between a hypothesis and a scientific Theory? Between a hypothesis and a prediction? What kinds of hypotheses are useful for scientific investigations that try to explain the natural world‚ and which are not? Give one or more examples of hypotheses that are and are not scientifically useful. (a.) A scientific theory has two components; a pattern
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2. Explain why increasing extracellular K+ causes the membrane potential to change to a less negative value. How well did the results compare with your prediction? Your answer: By increasing the extracellular K+ the membrane potential will change to be a less negative value. By adding more extracellular K+ the intracellular K+ will decrease and cause the membrane potential to become less negative. This result in a increased postitve membrane was what we predicted during the experiment. 3. Explain
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Neurophysiology of Nerve Impulses ACTIVITY 1 The Resting Membrane Potential 1. Explain why increasing extracellular K+ reduces the net diffusion of K+ out of the neuron through the K+ leak channels. If the extracellular K+ increases then the concentration of intracellular K+ will decrease causing a decrease in the steepness of the concentration gradient and fewer K+ ions would be drawn out. 2. Explain why increasing extracellular K+ causes the membrane potential to change to a less negative value. How
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