Journal of Microbiology

Phosphatase activity in Cheonho Reservoir: Kwag, No Tae , Son, Jae Hak , Lee, Jeong Sub , Ahn, Tae Young; J. Microbiol. 1995;33(4):267-272.

Abstract: Phosphatase activity was measured with other environmental factors in Cheonho reservoir in 1994. It ranged form 95 to 1,685 nM/1/h and was correlated significantly with chlorophyll-a. Such a close relation well matched the fact that over 90% of phosphatase activity was detected in > 3 um fraction. The phosphatase activity also correlated negatively with dissolved inorganic phosphate concentration, which implies derepression of phosphatase production by phosphate limitation. Significant correlation was analyzed between phosphatase activity and BOD, which also appeared to be closely correlated with chlorophyll-a. A great percentage of organic materials seems to be generated autochthonously by algae and extracellular enzyme even though allochthonous influence was thought to be stronger in Cheonho reservoir.

Effect of β-Glucosidase on the Heteroprophic Bacteria in Cheonho Reservoir: Kwag, No Tae , Han, Suk Kyun , Go, You Seok , Ahn, Tae Young; J. Microbiol. 1998;36(2):145-150.

Abstract: Cheonho reservoir is a small and eutrophicated lake. The variation of BOD in the reservoir was correlated to the variation of chlorophyll-a. BOD was maximum (39.1㎍/L) at site 1 in July of 1995 when chlorophyll-a was the highest. β-Glucosidase activities ranged from 9 to 241 nM/h. β-Glucosidase activity varied in the following order:site 3>site 2>site 1>site 4. The β-Glucosidase activity of the site 4 was less than 50% of the other three sites. Organic matter was produced by algae at all sites but was not directly related with the increase of heterotrophic bacteria. β-Glucosidase activity showed a close correlation with the number of heterotrophic bacteria, indicating a tight coupling between algae and heterotrophic bacteria through agal organic production.

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