منابع مشابه
Chemotaxis mutants of Spirochaeta aurantia.
Five Spirochaeta aurantia chemotaxis mutants were isolated. One mutant (the che-101 mutant) never reversed, one (the che-200 mutant) flexed predominantly, two (the che-300 and che-400-1 mutants) exhibited elevated reversal frequencies, and one (the che-400 mutant) exhibited chemotactically unstimulated behavior similar to that of the wild-type strain. The che-101 and che-400 mutants were essent...
متن کاملA voltage clamp inhibits chemotaxis of Spirochaeta aurantia.
Anaerobic conditions were employed to study the relationship between membrane potential and chemotaxis in Spirochaeta aurantia. When cells were grown anaerobically and suspended in anaerobic potassium phosphate buffer (pH 5.5), membranes did not appear to be polarized. Nevertheless, motility was supported by a transmembrane pH gradient, and the anaerobic cells exhibited D-xylose taxis. Introduc...
متن کاملMotility and chemotaxis of Spirochaeta aurantia: computer-assisted motion analysis.
A computer program has been designed to study behavior in populations of Spirochaeta aurantia cells, and this program has been used to analyze changes in behavior in response to chemoattractants. Three kinds of behavior were distinguished: smooth swimming, flexing, and reversals in direction of swimming after a short pause (120 ms). Cell populations exposed to chemoattractants spent, on average...
متن کاملChemotaxis of Spirochaeta aurantia: involvement of membrane potential in chemosensory signal transduction.
The effects of valinomycin and nigericin on sugar chemotaxis in Spirochaeta aurantia were investigated by using a quantitative capillary assay, and the fluorescent cation, 3,3'-dipropyl-2,2'-thiodicarbocyanine iodide was used as a probe to study effects of chemoattractants on membrane potential. Addition of a chemoattractant, D-xylose, to cells in either potassium or sodium phosphate buffer res...
متن کاملSpirochaeta aurantia has diacetyl chloramphenicol esterase activity.
The free-living spirochete Spirochaeta aurantia was nearly as susceptible to diacetyl chloramphenicol, the product of chloramphenicol acetyltransferase, as it was to chloramphenicol itself. This unexpected susceptibility to diacetyl chloramphenicol was wholly or partly the consequence of intrinsic carboxylesterase activity, as indicated by high-performance liquid chromatography, thin-layer chro...
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ژورنال
عنوان ژورنال: Journal of Bacteriology
سال: 1977
ISSN: 0021-9193,1098-5530
DOI: 10.1128/jb.130.1.485-494.1977