Cation Stimulation, Chlorella fusca, Green Alga, Multiphasic Uptake, Sulfate Analogues, Sulfate Starvation Sulfate uptake into the unicellular green alga Chlorella fusca Shihira et Krauss strain 211-8 b was described as a pH-, temperatureand energy-dependent process. Transport followed triphasic kinetics with /^-values of 1.3 x 10-5, 3.9 x 105 and 2.8 x 10 4 m . The Hill plot showed coeffi­ cie...

The Arrhenius plot for 39At released uring step heating of a sample containing a distribution of diffusion domains will depart from a straight line in ways that depend on the domain size distribution and the heating schedule used to extract he 39At. In a new series of experiments we make use of the heating schedule effect to confirm the multidomain nature of several alkali feldspar samples. We ...

Cross-linking studies on the Escherichia coli F0F1ATP synthase indicated a site of interaction involving g and e subunits in F1 and subunit c in F0 (Watts, S. D., Tang, C., and Capaldi, R. A. (1996) J. Biol. Chem. 271, 28341–28347). To assess the function of these interactions, we introduced random mutations in this region of the g subunit (g194–213). One mutation, gGlu-208 to Lys (gE208K), cau...

Transport characteristics of D-glucose were studied in the microvillous vesicles isolated from the human term placenta. Transport occurred by selective and rapid facilitated diffusion system which was inhibitable by phloretin and HgCl2. The transport was dependent on a transmembrane. Na+-gradient indicating a "secondary active transport" system operating. The transport influx was saturable and ...

The effects of temperature on the rate of reaction of plasma albumin and formaldehyde in water solution and in ethanol water mixtures (1-25%) were investigated under seven temperatures from 20-45 C. The effects of the temperature variations on the reaction of plasma albumin with formaldehyde were then established from a plot of ln(At-A∞) against time at each of the varied temperatures. Also the...

Cross-linking studies on the Escherichia coli F0F1-ATP synthase indicated a site of interaction involving gamma and epsilon subunits in F1 and subunit c in F0 (Watts, S. D., Tang, C., and Capaldi, R. A. (1996) J. Biol. Chem. 271, 28341-28347). To assess the function of these interactions, we introduced random mutations in this region of the gamma subunit (gamma194-213). One mutation, gammaGlu-2...

The fluorescence decay time of cis-stilbene has been measured in a variety of solvents over a large temperature range. An isoviscosity Arrhenius plot in n-alkanes yields an activation energy of 386±29 em-I. We interpret this result as an upper limit for the cis-stilbene to trans-stilbene barrier in nonpolar solvents. Isoviscosity plots in small alcohols are nonlinear, indicating complicated beh...

Transportation of amino acids throughout the body is an essential mechanism to support life processes. phenomena such as diffusion, viscosity, etc., in aqueous medium are useful understand their inter- and intra-molecular interactions. In this work, we performed classical molecular dynamics simulation study transportation properties γ-aminobutyric acid (GABA) environment. Self-diffusion coeffic...