4 Which is an example of active transport? A movement of glucose molecules into the cells of the villi B movement of glucose molecules down a concentration gradient C movement of ions in blood plasma D movement of water in the transpiration stream 相关知识点: 试题来源: 解析 A 反馈 收...
Effects of sub-distribution zone structure of bipolar plate on the mass transport of large-area proton exchange membrane fuel cells Sub-distribution zone of the flow field plays an important role in distributing gas reactants and removing liquid products in large-active area proton exch... B Liu...
semiconductor devicessemiconductor technologysilicon-on-insulatorIBM microchipsSiGecopper conductor technologyenvironmentally conscious productsNot Availabledoi:10.1515/jnet.1981.6.3.165BertrandG.Walter de Gruyter, Berlin / New YorkJournal of Non-Equilibrium Thermodynamics...
In most instances, secondary active transport involves only two species (Na+ and another substrate), but in some cases there are three: an example is the Na+-K+-2Cl− co-transporter, an electroneutral symporter that is expressed principally in epithelial cells. This transporter accounts for ...
Equation 14.8 is an example of a more general principle. Assuming that rapid biochemical processes are always at equilibrium can greatly simplify a model by reducing the number of differential equations. When multiple classes of buffer sites (S1, S2,…) are present, each class will have its ...
discoverable and accessible over the Internet without regard to the platform the consumer is running on or which programming language was used in order to create the consumer. In other words, a service provides platform- and language-independent services. Web Services is just one example of this....
L1210 cells transport P i in the absence of added Na +. Uptake shows saturation kinetics (K t = 1.7 mM), is temperature-dependent, and can be reduced 80% by high levels of unlabeled P i, and thus has the characteristics of a carrier-mediated process. This transport process is also in...
Researchers at the University of California, San Francisco, have demonstrated a new way to transplant cells into organs by piercing liver cells with rapid pulses of electricity. CAS holds 17th National Science Week From May 20 to 21, Chinese Academy of Sciences (CAS) held the 17th National Scie...
The Na+/K+ pump is an example of a primary active transport system that maintains a gradient of approximately 140 mM Na+ outside of the cell and 5 mM Na+ inside the cell. In secondary active transport, the energy from ATP is not directly utilized. Instead, the electrochemical gradient ...
Active Transport May Dominate over Diffusion for Macromolecules For mostmacromolecules, intracellular movement is often viaactive transportrequiring ATP. Active transport is especially important in cells with extended morphologies, such as neurons. In neurons, calculations indicate that passive diffusion of mR...