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||Barbara GM, Mitchell JG. Bacterial tracking of motile algae. FEMS Microbiol Ecol. 2003 May 1 44(1):79-87. doi: 10.1111/j.1574-6941.2003.tb01092.x. p.81 table 1PubMed ID19719653
||P.81 left column 2nd paragraph: "Swimming trajectory measurement: Cell paths of the algae and bacteria were measured frame by frame, traced off of the video screen and converted into swimming trajectories with x,y coordinates and time in seconds [ref 4]. By plotting the swimming trajectories of the cells with x,y coordinates it was possible to calculate run length and speed, as well as the turn angle and distance of bacterial cells in relation to tracked algae, enabling correct number of turns by bacteria toward alga to be recorded. The concentration of motile bacteria and algal cells within each sample was measured from video images and calculated using the focal depth and direct counts of those cells in the field of view [refs 4,6]."
||P.82 left column top paragraph: "The bacterial isolates, P. haloplanktis and S. putrefaciens, tracked algae at mean distances of 4±3 μm and 6±4 μm, respectively (Table 1 and Fig. 1). The bacteria tracked the algae, on average 1.8±0.4 s for P. haloplanktis and 0.7±0.2 s for S. putrefaciens. Individual bacterial speeds were not constant while tracking the alga but ranged from 5 to 401 μm s−1 for P. haloplanktis and from 9 to 445 μm s−1 for S. putrefaciens (Table 1 and Fig. 2). Bacteria increased their speed and shortened their run length nearly reversing direction at the end of each run with a high number of correct turns toward the tracked algal cell (Table 1 and Fig. 1). The mean turn angle was less and the turns per second were greater for a tracking bacterium than for non-tracking bacteria (Table 1)."