Journal of Microbiology

Research Support, Non-U.S. Gov't

Bacterial Aggregates Formation After Addition of Glucose in Lake Baikal Water: Lev P. Spiglazov , Valentin V. Drucker , Tae Seok Ahn; J. Microbiol. 2004;42(4):357-360.; DOI: https://doi.org/2098 [pii]

Abstract: For determining the process of bacterial aggregation, glucose was added into water from Lake Baikal which had been stored for seven months. In the presence of a higher concentration of glucose, the abundance of single bacteria and aggregates were higher, but the biovolumes of both bacteria were similar. Theses results mean that both free-living and aggregated bacteria have similar maximum sizes and that aggregates are forming with available organic materials. With available organic materials, the biovolume of aggregates becomes larger.

Image analysis of bacterial cell size by diurnal changes in lake Soyang, Korea: Choi, Seung Ik , Ahn, Tae Seok , Kato, Kenji; J. Microbiol. 1996;34(4):300-304.

Abstract: To define the effects of zooplankton and phytoplankton to bacteria, bacterial numbers, frequency of dividing cells (FDC) and size distribution were performed with image analysis in the surface layer of Lake Soyang. In August 1992, when Anabaena was blooming, the bacterial number increased at daytime. Bacterial numbers and FDC value had a negative correlation (r = 0.83, P < 0.01). Bacterial size spectrums were dynamically changed during the day and night, especially the small bacteria less than 0.5 ㎛^3. Meanwhile, in October, after the bloom, the bacterial number was only one third of that in August, even though the FDC was higher than that in August. The bacterial numbers of small size class dropped at 13.00. But the size spectrums were relatively constant during the night time. These results suggest that the bacterial growth was tightly coupled with phytoplankton during Anabaena bloom. And after the bloom, the bacterial number was controlled grazing activity of zooplankton at daytime.

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