Results 271 to 280 of about 434,984 (314)
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Optimal control of active transport across a biological membrane
Artificial Life and Robotics, 1998We propose an optimal control principle for active transport across a biological membrane. The modeling of the membrane is based on Hill and Kedem's thermodynamic model. The performance function used to evaluate the optimality of the transport involved the rate of time-dependent changes in the concentration of particles in all the membrane layers as ...
Hirohumi Hirayama +2 more
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Bioorganic & Medicinal Chemistry Letters, 2005
AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access the actual ChemInform Abstract, please click on HTML or PDF.
Gennady B, Lapa +6 more
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AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access the actual ChemInform Abstract, please click on HTML or PDF.
Gennady B, Lapa +6 more
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Active Transport in Biological Membranes and Stochastic Resonances
Physical Review Letters, 1997The role of intrinsic fluctuations of the membrane electric potential (barrier height) in the active transport of ions through cell membranes is examined. Experimental data [D.-S. Liu et al., J. Biol. Chem. 265, 7260 (1990)] on active transport of ${\mathrm{Na}}^{+}$ in human erythrocytes under the influence of ac electric fields can be interpreted as ...
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Transport of Biologically Active Interferon-gamma Across Human Skin in Vitro
Pharmaceutical Research, 1995Several studies have suggested epidermal uptake of cytokines, such as interferons, can be facilitated using topical liposomal formulations. We have evaluated the in vitro transport of biologically active recombinant human interferon-gamma (rhIFN-gamma) into and through split-thickness human skin to assess this possibility.Skin samples were exposed to ...
S M, Short +3 more
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Mathematical theory of biological periodicities II. Effect of active transport
The Bulletin of Mathematical Biophysics, 1969A previous study (Bull. Math. Biophysics,30, 735–749) is generalized to the case of active transport, which acts together in general with ordinary diffusion. The basic results obtained are the same except for an additional important conclusion. In principle it is possible to obtain sustained oscillations even when the secretions of the different glands
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SPIE Proceedings, 1998
Kinesin motor proteins transduce chemical energy released by adenosine triphosphate hydrolysis into mechanical force and motion along microtubule tracks. Biological cells use kinesin motors to transport intracellular components to specific cellular locations.
Loren Limberis, Russell J. Stewart
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Kinesin motor proteins transduce chemical energy released by adenosine triphosphate hydrolysis into mechanical force and motion along microtubule tracks. Biological cells use kinesin motors to transport intracellular components to specific cellular locations.
Loren Limberis, Russell J. Stewart
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Exosomes: Generation, structure, transport, biological activity, and diagnostic application
Biochemistry (Moscow) Supplement Series A: Membrane and Cell Biology, 2016Cells of almost all tissues secrete to the extracellular environment a variety of vesicular structures. The most interesting vesicles are exosomes–microvesicles ranging from 30 to 100 nm in size. These vesicles contain various RNA, including mRNA, microRNA, as well as membrane and cytoplasmic proteins that can be transported in these particles to ...
S. N. Tamkovich +2 more
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Noise-stimulated active transport in biological cell membranes
Physics Letters A, 1994Abstract We show that existing experimental data on active transport of ions in living biological cells can be interpreted in terms of the transfer of energy from the stochastic field (fluctuations of membrane potential), and propose a method of further experimental verification of this interpretation.
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Experimental evidence and biological significance of active transport
1961All living organisms as well as the individual cells of which they are composed are faced by two problems which are obviously antagonistic: They must retain their integrity, constraining their component molecules within a definite space, but, at the same time, require a continuous or periodic exchange of molecules with their surroundings. Off-hand, the
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The mutual binding exclusion mechanism in active transport across biological membranes
Cell Biophysics, 1987The coupling mechanism of sarcoplasmic reticulum ATPase is based on the reciprocal influence of calcium binding and phosphorylation domains. Cooperative calcium binding activates the enzyme, permitting utilization of ATP by transfer of its terminal phosphate to the enzyme.
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