Results 341 to 350 of about 14,870,238 (380)

Membrane potentials for keratin

Journal of Colloid Science, 1947
Abstract Measurements of the membrane potentials of keratin membranes have been made using KCl and NaCl and the results show how the selectivity of the membranes can be altered by soaking in suitable buffer solutions. The results support Toerell's theory of membrane behavior in neutral salts, and some membrane potential measurements using HCl ...
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Membrane potential in charged porous membranes

Journal of Membrane Science, 1999
Abstract For charged porous membranes, the separation efficiency to charged particles and ions is affected by the electrical properties of the membrane surface. Such properties are most commonly quantified in terms of zeta-potential. In this paper, it is shown that the zeta-potential can be calculated numerically from the membrane potential.
B Aoubiza, Anthony Szymczyk, Patrick Fievet, J. Pagetti   +3 more
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Membrane potentials of charged cellulosic membranes

Journal of Membrane Science, 1984
We have determined potentials of carboxymethyl cellulose (CMC) and carboxyethyl cellulose (CEC) membranes with various degrees of substitution in solutions of LiCl, NaCl, KCl and CsCl at 25°C. The ionic mobility ratio, D+/D-, in these membranes showed the same dependence on the Stokes radius of the cation as that in the bulk aqueous solution. D+/D- and
Han-jin Lim, Toshiro Iijima, Yuzi Kimura
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[66] Membrane potential and reconstitution

1979
Publisher Summary The enzymological approach to the study of membranous proteins whose function is to generate membrane potential requires that the three problems to be solved: (1) isolation of the membrane-potential-generating protein, (2) incorporation of the isolated components into artificial phospholipid membrane, and (3) measurement of the ...
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Alteration of Membrane Potential

2003
We began our investigation of cellular electrical properties, in the last chapter, with a look at the resting membrane potential, which is the ultimate power source for nervous system signaling. We will begin this chapter with a discussion of ways in which the membrane potential is altered so that signaling occurs over short distances (i.e., 10s or ...
L. Donald Partridge, Lloyd D. Partridge
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Membrane Potentials in Photosynthesis [PDF]

Annual Review of Plant Physiology, 1977
INTRODUCTION 504 DIGRESSION ON ELECTROCHEMISTRY ..... ..... 504 METHODS 507 Electrochromism in Chloroplasts ......... ... ... ...... ..... ... ..... 507 Kinetic evidence ........ ...... .... ..... ..... 508 Spectroscopic evidence ...... ... .... ... ... ........ ..... 508 Evidence [rom artificially induced diffUSion potentials
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Membrane potentials of thin nitrocellulose membranes

Journal of Applied Polymer Science, 1967
AbstractThe membrane potentials of thin (300–1300 A.) nitrocellulose (Parlodion) membranes have been investigated. Measurements were made in a Lucite cell by use of calomel electrodes with 0.05N KCl and 0.1N KCl. Variables having an influence on membrane structure, such as solvent polarity, temperature, and thickness, have been studied in relation to ...
Paul H. Carnell, Daniel E. McGunegle
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Equations for the membrane potential

Biophysics, 2009
The problem of an electric signal propagating over a thin layer modeling the cell membrane is considered in the electrostatic approximation. At both sides of the membrane there are bulk conductors with different properties. Various types of boundary conditions are examined.
S. A. Regirer, N. V. Kopylova
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DC Potentials of the Membranous Labyrinth

American Journal of Physiology-Legacy Content, 1958
The endolymphatic DC potentials were measured in the utricle, saccule and cochlear duct of the membranous labyrinth of the guinea pig and compared with potassium analyses of the endolymph. The average utricular potential was found to be +4 mv, the saccular potential +1 mv, and the cochlear potential +65 mv.
Carl F. Gessert, Bruce H. Deatherage, Hallowell Davis, Catherine A. Smith   +3 more
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Quantitative Analysis of Membrane Potentials

2009
The changes that occur in electrochemical gradients across biological membranes provide us with invaluable information on physiological responses, pathophysiological processes and drug actions/toxicity. This chapter aims to provide researchers with sufficient information to carry out a quantitative assessment of mitochondrial energetics at a single ...
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