The structure of the periphytic
diatom assemblage, summarized by a NMDS, showed a separation only between sites studied (Figure 4a).
For more clues, the researchers zeroed in on the sites of ROS production in
diatoms: the photosynthesizing organelles called chloroplasts, which harvest the sun's energy and produce ROS as a byproduct.
Diatoms and testaceous amoebae are free-living, calcareous protists 2 to 2 000 pm in size (Licea et al., 1996; Moreno et al., 1997).
Effects of fundamental nutrient stresses on the lipid accumulation profiles in two
diatom species Thalassiosira weissflogii and Chaetoceros muelleri.
At the time of sampling, the carapaces of all turtle species had not been cleaned by station staff for about a month, thus allowing sufficient time for
diatom colonization (Stevenson, Bothwell, Lowe, & Thorp, 1996).
[USA], Oct 21 ( ANI ): According to a recent study, unicellular
diatoms are able to adapt their behaviour to different external stimuli based on an evaluation of their own needs.
Researchers have previously found that
diatoms and sponges (which build their skeletons from silica) gradually buried in ocean sediments since the last ice age have a different silicon isotopic signature to their modern-day relatives.
Three hundred early juvenile abalone (0.015 [+ or -] 0.0002 SE g [abalone.sup.-1]), which only ever had access to
diatoms, were sampled before weaning.
The laboratory preparation of sediment samples for
diatom analysis followed Battarbee (1986).