Transporters responsible for primary active transport are referred to as pumps. In plasma membranes of most animal cells there can be expression of one or more of four ion-transporting ATPases. These are the Na+,K+-ATPase, H+-ATPase, H+,K+-ATPase, and Ca2+-ATPase. Secondary active ...
The passive transport of water across a membrane from a solution of lower-solute concentration to a solution of higher-solute concentration is best described as: a. general diffusion. b. osmosis. c. passive transport. d. facilitated diffusion. e. active t ...
Such membranes have been viewed as useful models of the more complex natural membranes. Caco-2 cells An immortalized line of heterogeneous human epithelial colorectal adenocarcinoma cells used as a drug transport model for assessing intestinal absorption. Transport measurements can be performed in two ...
Passive transport may be classified into diffusion, facilitated diffusion, and bulk flow. The focus in the current article is on simple diffusion, a process described by the random movement of solutes that results in the net transport (flux) along a concentration gradient. This process, at first...
Additionally, this law is the limit, in the sense of the weak convergence of measures, of the laws obtained as a result of any of the described regularizations. The so-called Kolmogorov point, that corresponds to the parameters characterizing the relaxation time and energy spectrum of a ...
A passive optical network (PON) is a system commonly used by telecommunications network providers that brings fiber optic cabling and signals all or most of the way to the end user. Depending on where the PON terminates, the system can be described as fiber to the curb, fiber to the buildi...
Nuclear pore complexes (NPCs) control biomolecular transport in and out of the nucleus. Disordered nucleoporins in the complex’s pore form a permeation barrier, preventing unassisted transport of large biomolecules. Here, we combine coarse-grained simulations of experimentally derived NPC structures wit...
where J is the flux of a mass of compound m, moving through a cross-sectional area A during time t as illustrated in Figure 3.2.1. The unit for a flux value could thus be mol cmA2 minA1, or alternatively mg cmA2 hA1.Movement of molecules in solution or molecular transport across ba...
transport. As a function of time, however, there is an apparent acceleration of land area exposed to erosion, as gleaned from the insets in Fig.3e,f. Nonetheless, the simple exposure rate for erosion suggests that, as sea level rises, erosion is not as susceptible as the other hazards ...
you would encounter is the plasma membrane. Movement across this membrane can take a number of different forms, generally classified into methods ofactive transportandpassive transport. Without these two forms of transport, cellular function as we know it would be impossible, as would our existence...