「active-transport system」に関連した動画の一覧

	Secondary Active Transport in the Nephron  Secondary Active Transport in the Nephron 2010年03月04日再生回数 84806
	Active Transport by Group Translocation Animation Video  www.ppdictionary.com 2010年08月04日再生回数 8638
	Wolfville Active Transportation (with ArcGIS Server)  15 Mb version of video demonstrating comparison of driving around Wolfville, NS to walking. Part of a third-term 2009 project for M Geddes at Centre of Geographic Sciences (COGS) - NSCC in the GIS Advanced Diploma. This demonstrates his use of ArcGIS Server (9.3) to compare driving a vehicle (can pick year / make / model of vehicle) to walking, running. (Completely for education purposes.) 2009年06月08日再生回数 426
	Active and Passive Transport  Biology video about active and passive transport 2010年02月10日再生回数 109008
	Active transport  the movement fo molecules across the cell membrane requiring energy 2007年09月20日再生回数 170052
	Membrane Transport  This course is part of a series taught by Kevin Ahern at Oregon State University on General Biochemistry. For more information about online courses go to ecampus.oregonstate.edu for the rest of the courses see www.youtube.com 1. Diffusion is a process in solutions where molecules move from a high concentration to a low concentration. 2. We break transport across membranes into two main categories - 1) passive transport (diffusion driven, so materials move only from high concentration to lower concentration and don't require outside energy), and 2) active transport (an energy-requiring process that moves at least one molecule from a low concentration to a higher concentration - this is contrary to simple diffusion). 3. Active transport moves at least one molecule in the opposite direction of where diffusion would operate (that is, active transport moves at least one molecule from a low concentration to a higher concentration). 4. ATP is a primary energy source for active transport, but there are other sources, as well (see below). The term 'pump' is used to describe the protein component of an active transport system. Pumps that move two molecules in the same direction across a membrane are called symports (or synports), whereas pumps that move two molecules in opposite directions across a membrane are called antiports. Pumps are called electroneutral if their action does not result in a net change in charge and electrogenic if their action changes the charge across the ... 2010年10月21日再生回数 7479
	Cell Biology: The Plasma Membrane (clip)  The processes of diffusion, osmosis, active transport and endocytosis are shown as the primary means of transferring molecules to and from cells through the membrane, providing needed chemical reactions, maintaining a stable interior environment and allowing a way for electronic signals to be passed to other cells—all necessary to sustain life. Produced by Bill Walker Productions in association with BioMedia Associates. A Coronet release. Bronze, Columbus International Film Festival Grade Levels: 9 to 12 15 minutes, color. Direct link to purchase the DVD: www.phoenixlearninggroup.com 2009年11月07日再生回数 64170
	Passive Transport-Education Use Only  Passive transport means moving biochemicals and other atomic or molecular substances across membranes. Unlike active transport, this process does not involve chemical energy, because, unlike in an active transport, the transport across membrane is always coupled with the growth of entropy of the system. So passive transport is dependent on the permeability of the cell membrane, which, in turn, is dependent on the organization and characteristics of the membrane lipids and proteins. The four main kinds of passive transport are diffusion, facilitated diffusion, filtration and osmosis. 2012年01月20日再生回数 297
	Cell Membrane, Active Transport  Cell Membrane, Active Transport 2007年12月09日再生回数 144744
	Bite-Sized Biochemistry #30 - Membrane Transport I  (01/10/11) Lecture by Kevin Ahern of Oregon State University discussing Biochemistry Basics in BB 451. See the full course at oregonstate.edu This course can be taken for credit (wherever you live) via OSU's ecampus. For details, see ecampus.oregonstate.edu Download Metabolic Melodies at www.davincipress.com Related courses include BB 350 - oregonstate.edu BB 450 - oregonstate.edu BB 100 - oregonstate.edu 1. Cellular membranes are somewhat fluid in nature. The fluidity of membranes is related to their composition - shorter, more unsaturated fatty acids make for membranes that retain fluidity at lower temperatures compared to longer, saturated fatty acids. Fish membranes, for example are full of unsaturated and polyunsaturated fatty acids, which makes sense because fish membranes must be fluid at fairly low temperatures. 2. Biological membranes can be in a fluid or a more solid state. The midpoint of the conversion between the solid and the fluid state is referred to as the Tm. Cholesterol is often found in membranes. Though it does not change the Tm of a membrane it does widen the range of the transition temperature between solid and fluid state. 3. The Fluid Mosaic Model explains the fluidity of cellular membranes. Movement of phospholipids within the plane of the lipid bilayer they are located in is easy and quick. Movement of phospholipids from one plane to the other plane (flipping) is infrequent and is facilitated by the action of enzymes called flipases. 4. Not all ... 2011年08月04日再生回数 1711