منابع مشابه
Uphill Transport Induced by Counterflow
1. In a membrane transport system containing a mobile carrier with affinities for two substrates a concentration gradient with respect to one of the substrates under certain conditions is able to induce an "uphill" transport (against the concentration gradient) of the other. 2. In a kinetic treatment quantitative conditions for such a "flow-induced uphill transport" and some of its characterist...
متن کاملCooling Induced by Uphill Energy Transport in Plant Photosystems
The uphill energy transfer in photosystems implies input energy at higher wavelength leading to energy output at lower wavelength. Briefly, energy is uphill transported from photosystem I (PSI) to photosystem II (PSII), the latter having a lower wavelength emission. This uphill energy transport involves absorption of thermal energy from the surroundings. While such cooling effects have been rep...
متن کاملUphill and downhill water transport in rat glioma cells.
The cell water content determines the cell volume, which in turn controls numerous cellular functions. The mean volume of rat glioma cells was electronically measured under isotonic and anisotonic conditions. Two types of isotonic solutions were used containing either high or low concentrations of NaCl, KCl or N-methylglucamineCl. In low salt solutions, osmolarity was maintained constant by the...
متن کاملPlant K+ Transport: Not Just an Uphill Struggle
Most plant cells can accumulate K+ to concentrations much higher than those in the external medium. Recent studies are providing new insights into the relative roles of channels and transporters in K+ accumulation. These studies are also pointing to specific roles for K+ channels and transporters in polarized development.
متن کامل“Uphill” cation transport: A bioinspired photo-driven ion pump
Biological ion pumps with active ionic transport properties lay the foundation for many life processes. However, few analogs have been produced because extra energy is needed to couple to this "uphill" process. We demonstrate a bioinspired artificial photo-driven ion pump based on a single polyethylene terephthalate conical nanochannel. The pumping process behaving as an inversion of zero-volt ...
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ژورنال
عنوان ژورنال: Journal of General Physiology
سال: 1957
ISSN: 1540-7748,0022-1295
DOI: 10.1085/jgp.41.2.289