Two days after inoculating Durham tubes, you notice the indicator dye has turned from a red color to a yellow color, and there is gas production. The Durham tubes were placed back in the incubator to grow for two more days, at which time you notice the yellow tubes are now red. The following table lists the results for inoculation of organisms in nitrate broth tubes. Person one shook hands with person two, who shook hands with person three, who then shook hands with person four. Two plates were inoculated with Bacillus cereus .
Soil bacteria encompass a wide range of nutritional types.
Suppose you have an organism whose optimal growth temperature is 20 degree Celsius and its growth is greatly inhibited by temperatures above 35 degree Celsius. Suppose you obtained 1 gram worth of soil and you diluted it with 99 ml of water. You then take 1 ml worth of the dilution and put it into another 99ml of pure water. True or False. Bacteria numbers in soil are generally lesser in the rhizosphere than anywhere else.