Results 261 to 270 of about 917,628 (315)
Some of the next articles are maybe not open access.
Membrane transport of cobalamin
2022A wide variety of organisms encode cobalamin-dependent enzymes catalyzing essential metabolic reactions, but the cofactor cobalamin (vitamin B12) is only synthesized by a subset of bacteria and archaea. The biosynthesis of cobalamin is complex and energetically costly, making cobalamin variants and precursors metabolically valuable.
Nijland, Mark +3 more
openaire +2 more sources
2003
The chapter reviews the current understanding of the transport mechanisms for folates in mammalian cells--their molecular identities and organization, tissue expression, regulation, structures, and their kinetic and thermodynamic properties. This encompasses a variety of diverse processes.
Larry H, Matherly, David I, Goldman
openaire +2 more sources
The chapter reviews the current understanding of the transport mechanisms for folates in mammalian cells--their molecular identities and organization, tissue expression, regulation, structures, and their kinetic and thermodynamic properties. This encompasses a variety of diverse processes.
Larry H, Matherly, David I, Goldman
openaire +2 more sources
Membrane Transport of Proteins
Nature New Biology, 1972FACILITATED diffusion of small organic molecules across cell membranes is thought to be carrier-mediated in part because the process displays reaction kinetics. Models describing carrier transport assume that the transported molecule is associated with the membrane, reacting presumably with membrane proteins, and is then moved across the barrier.
C, Liebow, S S, Rothman
openaire +2 more sources
Polyamines and membrane transporters
Amino Acids, 2013In recent years, our understanding of the importance of membrane transporters (MTs) in the disposition of and response to drugs has increased significantly. MTs are proteins that regulate the transport of endogenous molecules and xenobiotics across the cell membrane.
Ahmed A, Abdulhussein +1 more
openaire +2 more sources
Classification of Membrane Transporters
2005In summation, classification of membrane transporters is a challenging issue. One must consider not only their primary structure, but one must also ponder their function, topology, evolutionary origins, substrate specificity, and structural architecture.
W, Sadée, R C, Graul, A Y, Lee
openaire +2 more sources
Synthetic membrane transporters
Current Opinion in Chemical Biology, 2002An increasing number of synthetic compounds have been shown to facilitate ion and polar molecule transport across bilayer membranes. Most notably, recent advances in anion transport have yielded synthetic chloride channels and phospholipid translocases.
J Middleton, Boon, Bradley D, Smith
openaire +2 more sources
Journal of The Electrochemical Society, 2008
The proposed model allows estimating polymer membrane transport properties. It is based on a microscopic description of charge and water transport in a single capillary with a uniform distribution of charge at the wall. The equations are solved analytically for two geometries: cylindrical capillary and parallel plates.
Colinart, T. +4 more
openaire +2 more sources
The proposed model allows estimating polymer membrane transport properties. It is based on a microscopic description of charge and water transport in a single capillary with a uniform distribution of charge at the wall. The equations are solved analytically for two geometries: cylindrical capillary and parallel plates.
Colinart, T. +4 more
openaire +2 more sources
1974
The relative constancy of the internal environment of the cell is maintained by a variety of transport systems which are located within the membrane. These transport systems serve to regulate the entrance and exit of various solutes concerned with the metabolic activity of the cell.
openaire +2 more sources
The relative constancy of the internal environment of the cell is maintained by a variety of transport systems which are located within the membrane. These transport systems serve to regulate the entrance and exit of various solutes concerned with the metabolic activity of the cell.
openaire +2 more sources
Transport Phenomena in Membranes
Angewandte Chemie International Edition in English, 1969AbstractThe realization that many elementary biological processes occur at membrane‐like structures has led to renewed interest in the theory of molecular transport through membranes. Coupling phenomena in membranes, some of which are very complex, can now be rationally described with the aid of the thermodynamics of irreversible processes.
openaire +2 more sources
1996
Many substrates cross cell membranes by processes other than passive diffusion. When the transport is carrier-mediated, e.g., facilitated diffusion, active transport, and exchange diffusion, the carrier modifies the conductance of the membrane and may either increase or decrease the flux of the substrate across the membrane.
openaire +2 more sources
Many substrates cross cell membranes by processes other than passive diffusion. When the transport is carrier-mediated, e.g., facilitated diffusion, active transport, and exchange diffusion, the carrier modifies the conductance of the membrane and may either increase or decrease the flux of the substrate across the membrane.
openaire +2 more sources