Table 1 Statistics: residual concentrations of starch (measured by optical density after reaction with iodine) in the R. rubrum culture after 2 h exposition in the geomagnetic field (Blank) and in the impulse magnet field (IMF)

Level of growth as starch concentration by OD,  % of initial

98

79

68

60

Geomagnetic field (blank)

 Final starch concentration in the experiment, OD, average mean (x)

3.26

2.63

2.24

1.98

 OD standard deviation (s) for 12 columns

0.006

0.009

0.007

0.007

Impulse magnet field (IMF)

 Final starch concentration in the experiment, OD, average mean (x)

3.18

2.01

1.84

1.92

 OD standard deviation (s) for 12 columns

0.021

0.200

0.050

0.037