Yaacov OkonLutfu CakmakciIsrael NuIlan Chet2014-04-262014-04-261980Microb. Ecol. 6:277-280http://hdl.handle.net/123456789/622Azospiritlum brasilense was attracted to capillaries containing either phosphate buffer, distilled water, or saline. The number of bacteria in these capillaries was 3-4 X 10^4, after 1 h of incubation, [n the presence of phosphate buffer + attractants, the number of cells accumulated in the capillary increased only to5x 10^4-I.I x 10^5 cells. It was not possible, therefore, to measure chemotaxis in A. brasilense as distinct from aerotaxis by the capillary method. Chemotaxis was observed in semi-solid agar plates and was determined by a growth band oriented towards the attractant. Positive chemotactic response was obtained with peptone, tryptone, yeast extract, amino acids, organic acids, arabinosc and galactoseenArticle