Motility of S. typhimurium at constant attractant levels

Range 27.2 to 28.8 Table - link μm/sec
Organism Bacteria Salmonella typhimurium
Reference Macnab RM, Koshland DE Jr. The gradient-sensing mechanism in bacterial chemotaxis. Proc Natl Acad Sci U S A. 1972 Sep69(9):2509-12. p.2511 table 1PubMed ID4560688
Method P.2509 right column 4th paragraph: "The bacteria were observed in dark-field and photographed with a stroboscopic high-pressure xenon-arc lamp. By a suitable choice of flashing rate (typically in the range 3-5 Hz), Successive images of a bacterium generate its motility track across the photograph. A similar technique has recently been described for paramecium motility measurements (ref 11). Open-shutter photography had been used in the very early studies of Harris (ref 12)."
Comments P.2511 left column 2nd paragraph: "The results, as shown in Table 1, reveal that the velocities of the bacteria are essentially unchanged by absolute levels of attractant in the range of the experiments reported here. Moreover, there was no relaxation process when the bacteria were observed over long intervals." See note beneath table
Entered by Uri M
ID 106818