. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 0123456789 0123456789 2000000 1000000. 2000000 1000000 80 60 40 20 0 0123456789 0123456789 £ 2000000 c 1000000 1 III, : .i^ - ⢠i '5 â 5- -o - r"^ jlJ 80 I" o 60 E;~ 40 I y^ -a M 20 % 0 0123456789 Culture age (days) Figure 4. Growth (unfilled circles) and motility (tilled circles) of five strains oi Amphora cojfeaeformis at 20''C. In each case n = 3. A. cojfeaeformis is incapable of movement in a medium without calcium and that motility increases sharply be- tween and mM external [Ca]. The motility curve
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 0123456789 0123456789 2000000 1000000. 2000000 1000000 80 60 40 20 0 0123456789 0123456789 £ 2000000 c 1000000 1 III, : .i^ - ⢠i '5 â 5- -o - r"^ jlJ 80 I" o 60 E;~ 40 I y^ -a M 20 % 0 0123456789 Culture age (days) Figure 4. Growth (unfilled circles) and motility (tilled circles) of five strains oi Amphora cojfeaeformis at 20''C. In each case n = 3. A. cojfeaeformis is incapable of movement in a medium without calcium and that motility increases sharply be- tween and mM external [Ca]. The motility curves for strains IIIb and IIIp were very similar and showed saturation (of -70% motility) at about 5 mM external [Ca]. The other strains did not show saturation. Strains #2036 and #2038 showed a similar motility response, rising to â60% at 5 mM external [Ca]. and #2039 gave a relatively poor response to millimolar Ca levels ( at 5 mM external [Ca]). In each case the motility on plates with mM added Ca was of the order of a few percent- age points. This is a prerequisite for the detection of an EMF effect with this system. {Hi) Effect of light intensity. Varying the photon flux density from < to pE s~' m - had no effect on the motility of #2038 diatoms (Table I). iiv) EMF experiments. The results of EMF experi- ments are presented in Tables II-XII. Most data were analyzed by f-tests as pairs of control and EMF-exposed groups. Most data were not suitable for multivariate or factorial analyses as cell motility in each experiment was largely determined by the position of the diatoms in their growth curve. Although a very broad range of EMF condi- tions were employed â including those purported to pro- duce ion cyclotron resonanceâand in most cases each was tested twice, a significant difference in diatom motil- ity between exposed and control plates was not demon- strated in any case. No amplitude or frequency window was found. There was no reduction in m
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