Results 261 to 270 of about 8,094,321 (309)
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Activation of sodium transport across biological membranes
Experientia, 1971Es wird die Temperaturabhangigkeit zur Entscheidung uber den «aktiven» oder «passiven» Na-Transport in der Amphibienhaut benutzt: Oxytocin verandert die Na-Permeabilitat, wahrend zyklisches AMP (+Thophyllin) einen aktiven Prozess zu beeinflussen scheint.
T, Dalton, R S, Snart
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Biological Activity of Macrocyclic Cation Transporters
Current Organic Chemistry, 2015This review describes two families of ion transporters: the lariat ethers and the hydraphiles. The lariat ethers transport ions as carriers and hydraphiles of appropriate length form pores in bilayer membranes.
Ryan Cantwell +7 more
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The theory of transport phenomena in biological membranes. II. The active transport of ions
Biochimica et Biophysica Acta (BBA) - Biomembranes, 1970Abstract A model is suggested coupling the processes of the passive and active transport of the Na + and K + in biological membranes. It is shown that the mechanism of active transport has features common to the mechanism of passive transport. However, it differs in the driving force maintaining the directed flow of ions.
M V, Volkenstein, S N, Fishman
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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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Oligonucleotide biological activity: Relationship to the cell cycle and nuclear transport
Biology of the Cell, 1997Previous studies suggest that oligodeoxynucleotide (ODN) cellular uptake is cell cycle‐dependent which may have important implications in cancer cell targeting. To further our understanding of ODN transport and activity, this study examines the relationships between the cell cycle, ODN cellular uptake, intracellular transport, and activity.
S, Wu-Pong +3 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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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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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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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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