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Volume 23 (1987)
- Issue 2 Pages 1-
- Issue 1 Pages 1-
Volume 23, Issue 2
Displaying 1-8 of 8 articles from this issue
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Akira HIRAISHI, Kazuaki SAHEKI, Susumu HORIE1987 Volume 23 Issue 2 Pages 1-6
Published: December 15, 1987
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSThe quantitative and qualitative distribution of coliforms in coastal seawater in Tokyo Bay was investigated. Total coliforms and fecal coliforms were detected with numbers of the order of 102-104 viable cells per 100 ml from seawater samples taken at five sites. Their numbers highly correlated with organic pollution levels as determined by chemical oxygen demand. The major constituents of the coliform flora of those environments were Escherichia coli and Klebsiella pneumoniae. On the other hand, psychrotrophic coliform species, such as Rahnella aquatilis and Serratia fonticola, were scarcely encountered. These findings present a strinking contrast to the results previously obtained with mountain stream water.View full abstractDownload PDF (671K) -
Yuhei INAMORI, Takahiro OUCHIYAMA, Norio SUGIURA, Ryuichi SUDO1987 Volume 23 Issue 2 Pages 7-14
Published: December 15, 1987
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSSeasonal changes of periphytic smaller animals in Lake Kasumigaura, which has been hypertrophic, were investigated during the period of 1983 to 1984.
Species numbers of protozoa and metazoa in the total organisms attached on the biofilm-sheet were 156 and 28, respectively. The organisms were mainly divided into three types which were sessile, stoloniferous and free-swimming. Numbers of sessile type organisms decreased sharply in summer season, while stoloniferous type organisms increased in the season. It was suggested that the water of Lake Kasumigaura was α-mesosaprobic in summer and β-mesosaprobic in winter judging from saprobic system.View full abstractDownload PDF (733K) -
Yuhei INAMORI, Yuko KUNIYASU, Ryuichi SUDO1987 Volume 23 Issue 2 Pages 15-23
Published: December 15, 1987
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSSmaller metazoa appearing in biological treatment process are divided into two types. One is filter feeder such as Rotatoria and another is detritus feeder such as Oilgochaeta. To make clear the role of smaller metazoa in water purification, Philodina erythrophthalma and Aelosoma hemprichi were used as Rotatoria and Oligochaeta individually in this experiment. Smaller metazoa were cultivated under static and dark conditions in LE (Lettuce and egg yolk extract) medium containing several bacteria. The run of experiment consisted of only bacteria (B), bacteria+A. hemprichi (BA), bacteria+P. erythrophthalma (BP), and bacteria+A. hemprichi+P. erythrophthalma (BPA) . Purification efficiency was estimated by TOC, viable count and suspended solid in cultivation medium. The results obtained from this experiment were as follows.
(1) In the B system, the turbidity is high and the efficiency of organic matter removal is low because of existence of the large amount of dispersed bacteria.
(2) In the BA system, the amount of biomass decreases because the detritus feeder such as A. hemprichi feeds on the detritus, but the turbidity is still high and the efficiency of organic mater removal is not so high because of the presence of dispersed bacteria.
(3) In the BP system, the biomass and turbidity decrease and the efficiency of organic matter removal increases, since the filter feeder such as P. erythrophthalma feeds on the dispersed bacteria.
(4) And in the BPA system, the amount of biomass decreases most remarkably along with the turbidity reduction and improved efficiency of organic matter removal, because the coexistence of A. hemprichi and P. erythrophthalma whose feeding mechanisms and food habits differ from each other, promotes their predatory activities on the dispersed and flocculated bacteria.
It can be concluded that the detritus and filter feeder smaller metazoa in bio-film are contributing greatly to water purification and reducion of biomass.View full abstractDownload PDF (1009K) -
Masami INOKUCHI, Hiroshi FUKUSHIMA1987 Volume 23 Issue 2 Pages 24-29
Published: December 15, 1987
Released on J-STAGE: December 09, 2010
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Masami INOKUCHI, Hiroshi FUKUSHIMA1987 Volume 23 Issue 2 Pages 30-34
Published: December 15, 1987
Released on J-STAGE: December 09, 2010
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Tomohiko WATANUKI1987 Volume 23 Issue 2 Pages 35-38
Published: December 15, 1987
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSTwo taxa diatoms, Achnanthes affinis v. affinis and A.microcephala were isolated from the samples collected from elevated water tanks of buildings, in Kanagawa Prefecture. The growth characteristics of two diatoms were studied in several experimental conditions. The results clearly domonstrate that the growth of the diatoms required alkaline medium for optimal growth. The optimal growth of the diatoms were obtained t 20°C, pH8.0 with growth rate μ=1.0-1.1, doubling time=14.2-14.8 hours and number of generation=2.84-3.00. The maximum phtosynthesis of the diatoms were obtained at 30°C with 4.1 (O2 mg/mg chl. a/h) .View full abstractDownload PDF (353K) -
Tsuyako KO-BAYASHI, Hiroshi FUKUSHIMA, Harue OHTSUKA1987 Volume 23 Issue 2 Pages 39-42
Published: December 15, 1987
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESS -
Tsuyako KO-BAYASHI, Hiroshi FUKUSHIMA, Harue OHTSUKA1987 Volume 23 Issue 2 Pages 43-49
Published: December 15, 1987
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSDownload PDF (16068K)
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