Biochimica et biophysica acta, 984(3), 281-288 (1989-09-18)
Permeability coefficients (P) measured at various penetrant concentrations (C) by the perturbation method can be plotted to distinguish simple diffusion, simple pore kinetics and simple carrier kinetics as follows: for simple diffusion, 1/P = constant; for a simple pore, 1/P
Many microorganisms exhibit an adaptive response to mutagenic alkylation damage. In Escherichia coli the response is regulated by the inducible Ada protein. A sensitive immunoassay employing two anti-Ada monoclonal antibodies has been developed here to monitor low levels of induction
The stabilized phosphoranes, obtained from the three-component reaction between dialkyl acetylenedicarboxylates and urea or N-methylurea in the presence of triphenylphosphine, undergo a smooth reaction in boiling toluene to produce iminophosphoranes in good yields. Under the same reaction conditions, the phosphorane
Following short-term local applications of high doses of N-methyl-N-nitrozourea and 7,2-dimethylbenz(a)antracen, the intercellular adhesion in the distal colon epithelium of ice retains increased at least for a month. The magnitude of this shift and its duration ops both with moving
The thick ascending limb of Henle's loop (TALH) is thought to be involved in the regulation of the renal urea gradient. We have characterized the uptake of urea (oil density centrifugation and 2-compartment-culture) and volume regulation (impedance measurement) in highly
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