نتایج جستجو برای: net flux
تعداد نتایج: 181425 فیلتر نتایج به سال:
Switchgrass (Panicum virgatum L.) is being evaluated as a bioenergy crop for the northern Great Plains. Field measurements of CO2, CH4, and N2O flux are needed to estimate the net greenhouse gas (GHG) balance of this biofeedstock. The study objective was to determine effects of recommended Nitrogen (N) fertilization (67 kg ha 1 of N applied) and unfertilized switchgrass on growing season soil-a...
HUANG, K. C., AND THERESA S. T. CHEN. Ion transport acro.ss intestinal mucosa of winterjlounder, Pseudopleuronectes americanus. Am. J, Physiol. 220(6): 1734-1738. 197 1 .-Isolated winter flounder small intestine mounted in an Ussing chamber and bathed on both sides with teleost fish Ringer solution showed a PD ranging from 1 to 5 mv, with the serosa being electronegative to the mucosa. When the...
The present experiments were designed to evaluate coupling of water and nonelectrolyte flows in porous lipid bilayer membranes (i.e., in the presence of amphotericin B) in series with unstirred layers. Alterations in solute flux during osmosis, with respect to the flux in the absence of net water flow, could be related to two factors: first, changes in the diffusional component of solute flux r...
The direct acute effects of insulin on the regulation of hepatic gluconeogenic flux to glucose-6-phosphate (G6P) in vivo may be masked by the hormone's effects on net hepatic glycogenolytic flux and the resulting changes in glycolysis. To investigate this possibility, we used a glycogen phosphorylase inhibitor (BAY R3401) to inhibit glycogen breakdown in the overnight-fasted dog, and the effect...
Previous experimental evidence indicates that some cancer cells have an alternative glycolysis pathway with net zero ATP production, implying that upregulation of glycolysis in these cells may not be related to the generation of ATP. Here we use a genome-scale model of human cell metabolism to investigate the potential metabolic alterations in cells using net zero ATP glycolysis. We uncover a n...
Neutral carrier-based liquid membrane ion-selective microelectrodes for NH(4) (+) and NO(3) (-) were developed and used to investigate inorganic nitrogen acquisition in two varieties of barley, Hordeum vulgare L. cv Olli and H. vulgare L. cv Prato, originating in cold and warm climates, respectively. In the present paper, the methods used in the fabrication of ammonium- and nitrate-selective mi...
Toad bladders were challenged with vasopressin at one temperature, fixed on the mucosa with 1% glutaraldehyde, and then subjected to an osmotic gradient at another temperature. Thus, the temperature dependence of vasopressin action on membrane permeability was distinguished from the temperature dependence of osmotic water flux. As the temperature was raised from 20 degrees to 38 degrees C, ther...
Studies have been carried out on the movement of salt and water across the small intestine of the rat. Segments of the ileum of anesthetized rats have been perfused in vivo with unbuffered NaCl solutions or isotonic solutions of NaCl and mannitol. Kinetic analysis of movements of Na(24) and Cl(36) has permitted determination of the efflux and influx of Na and Cl. Net water absorption has been m...
Ingested K+ is believed to be absorbed mainly in the small intestine by passive diffusion through the paracellular pathway. To further clarify K+ absorption in the small intestine, we determined the unidirectional flux values of Rb+ in vitro by atomic absorption spectroscopy in the mouse ileum mounted in Ussing chambers under short-circuit conditions. The mucosal-to-serosal Rb+ flux (J(ms)) was...
Methanol is the second most abundant volatile organic compound in the troposphere and plays a significant role in atmospheric chemistry. While there is consensus about the dominant role of living plants as the major source and the reaction with OH as the major sink of methanol, global methanol budgets diverge considerably in terms of source/sink estimates reflecting uncertainties in the approac...
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