منابع مشابه
Intracellular Acidity in Valonia
The very large cells of the marine green alga Valonia macrophysa permit one to obtain several cubic centimeters of fluid from the central vacuole of a single cell (cf. Wodehouse, 1917), without involving appreciable alteration in the composition of the cell-sap through protoplasmic 'injury during the process of extraction (cf. Chambers, 1917). Estimations have been made of the acidity of this c...
متن کاملBioelectric Potentials in Valonia
In their influence on the P.D. across the protoplasm of Valonia macrophysa, Kütz., Li(+) and Cs(+) resemble Na(+), while Rb(+) and NH(4) (+) resemble K(+). The apparent mobilities of the ions in the external surface layer of Valonia protoplasm increase in the order: Cs(+), Na(+), Li(+) < Cl(-) < Rb(+) < K(+) < NH(4) (+).
متن کاملMathematical modelling of tumour acidity: regulation of intracellular pH.
Measurements of extracellular pH (pHe) in vivo have shown that the microenvironment in tumours is more acidic than in normal tissue. However, both human and animal tumour cells have been shown to have an intracellular pH (pHi) on the alkaline side of neutrality (pH 7.1-7.2). This gives rise to a reversed pH gradient between tumours and normal tissue which implies that cells within solid tumours...
متن کاملThe Electrical Capacity of Valonia
Impaled cells of Valonia were balanced in a Wheatstone bridge against a simple series-parallel circuit of two resistances and a capacity, the transient charge and discharge curves at make and break of direct current being recorded with a string galvanometer. With the resistances properly balanced, a series of characteristic deflections resulted when the balancing capacity was varied. With many ...
متن کاملEffects of Hexylresorcinol on Valonia
The effects on Valonia of guaiacol and hexylresorcinol are similar but the latter is more effective. Both substances lower or abolish the potassium effect; i.e., the ability of the cell to distinguish electrically between Na(+) and K(+). Both substances change the order of mobilities so that v(Cl) > u(Na) becomes u(Na) > v(Cl) or u(Na) = v(Cl).
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ژورنال
عنوان ژورنال: Journal of General Physiology
سال: 1919
ISSN: 1540-7748,0022-1295
DOI: 10.1085/jgp.1.6.581