Results 181 to 190 of about 260,163 (214)
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A channel model with fluctuating barrier structures
Biochimica et Biophysica Acta (BBA) - Biomembranes, 1992Following the theory 'Fluctuations of barrier structure in ionic channels' (Läuger, P., Stephan, W. and Frehland, E. (1980) Biochim. Biophys. Acta 602, 167-180), we constructed a model of a channels with several conformational states. The origin of these conformational states and the source for the transitions from one to the other are given explicitly
J, Nieto-Frausto, B, Kleutsch
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Structural and Racial Barriers to Health Care
Annual Review of Nursing Research, 2004Limited access to health care and a system fraught with discriminatory practices inhibit some racial and ethnic minorities from gaining access to health care and assurance of equal treatment once they enter the health care system. The purpose of this chapter is to critically and systematically analyze the research literature to determine what impact ...
Linda, Burnes Bolton +2 more
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The Effect of Liposomes on Skin Barrier Structure
Skin Pharmacology and Physiology, 1999The present work deals with the ‘in vivo’ stripping technique to evaluate the percutaneous absorption of sodium fluorescein (NaFl) vehiculized in two different liposome preparations formed by phosphatidylcholine (PC) and lipids mimicking the stratum corneum (SC; ceramides, cholesterol, palmitic acid and cholesteryl sulphate), respectively. Furthermore,
L, Coderch +5 more
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The Thermal Barrier—Structures
Journal of Fluids Engineering, 1955Abstract In the past few years the term “barrier” has become popular in aeronautics. Not so long ago we heard of the sonic barrier which in the minds of many laymen represented a solid wall of compressed air which would not let an airplane through at the speed of sound.
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The structural basis of the blood-ocular barriers
Experimental Eye Research, 1977In the mammalian eye, endothelial barriers are localized in the vessels of (i) the retina, (ii) optic nerve, (iii) ciliary muscle and (iv) iris. The endothelial barrier of the vessels in the retina is insensitive to drugs or autocoids, whereas the vessels of the iris may respond to pharmacological manipulations with increased permeability.
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Defects in Schottky barrier structures
Soviet Physics Journal, 1983The progress achieved in recent years in study of the element and phase composition, as well as the energy spectrum of electron states on semiconductor boundaries with metals and dielectrics, has shown the complexity and multifaceted nature of the physicochemical reactions-occurring on these boundaries.
A. P. Vyatkin, N. K. Maksimova
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Schottky barriers and semiconductor band structures
Physical Review B, 1985Various models of Schottky-barrier formation suggest Fermi-level pinning in midgap. Elemen- tary band-structure considerations indicate that, for diamond-structure semiconductors, the physically relevant gap is the indirect gap, corrected for spin-orbit splitting. Schottky-barrier heights for elemental and III-V compound semiconductors can be predicted
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Physica Status Solidi (a), 1984
The electrical and photoelectrical characteristics of Sm–p-GaSe barrier structures produced by the method of vacuum deposition are investigated. The structures of interest is shown to have a pronounced diode structure (rectification factor amounts to 103 to 104 at U = (1 to 3) V), in this case the prevailing mechanism of current passage is connected ...
D. D. Askerov +3 more
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The electrical and photoelectrical characteristics of Sm–p-GaSe barrier structures produced by the method of vacuum deposition are investigated. The structures of interest is shown to have a pronounced diode structure (rectification factor amounts to 103 to 104 at U = (1 to 3) V), in this case the prevailing mechanism of current passage is connected ...
D. D. Askerov +3 more
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2005
The skin is composed of several morphologically distinct layers. The skin is protected primarily by the stratum corneum (SC). The superficial region, which is only 10-20 mm thick, is the primary barrier to the percutaneous absorption of compounds, as well as to water loss. Underlying the SC is the viable epidermis (50-100 mm thick), which is responsible
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The skin is composed of several morphologically distinct layers. The skin is protected primarily by the stratum corneum (SC). The superficial region, which is only 10-20 mm thick, is the primary barrier to the percutaneous absorption of compounds, as well as to water loss. Underlying the SC is the viable epidermis (50-100 mm thick), which is responsible
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