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Volume 24 (1963)
- Issue 3-4 Pages 63-
- Issue 1-2 Pages 1-
Volume 24, Issue 3-4
Displaying 1-6 of 6 articles from this issue
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Isao MOTOTANI, Kazuo KOBORI1963 Volume 24 Issue 3-4 Pages 63-71
Published: November 30, 1963
Released on J-STAGE: October 16, 2009
JOURNAL FREE ACCESSSince water pollution resulting from human activities are neither temporal nor partial in these days, limnologists and ecologists will inevitably be to study the waters under such artificial effects. Metabolic changes of substances by microbes are the most important process among natural purifications of organic pollutions, because most organic matters are decomposed by microbial activities. The authors consider the relationship between oxygen consumptions of both bacteria and protozoa, as well as their increases based on several assumptions. They also explain that BOD (Biochemical Oxygen Demand) test which has widely been used as an indicator of polluted water closely relates to metabolism of both bacteria and protozoa.View full abstractDownload PDF (731K) -
Mitsumi KANEKO1963 Volume 24 Issue 3-4 Pages 72-78
Published: November 30, 1963
Released on J-STAGE: October 16, 2009
JOURNAL FREE ACCESSThe distribution of coli form group along the Kiso river was examined by employing both the fermentation-tube method and the deoxycholate agar method. The pollution by the discharge (pulp waste) from a spinning factory (T) was conspicuous between Nakatsugawa and Asahi in the Kiso river. The left side of the river at Kusai where was 4 km downstream from the outlet of the waste was more polluted than the right side. The waste, however, was well mixed at Kasamatsu where was 15 km downstream from the outlet. The comparison of the two methods was performed on the basis of experimental results. The results expressed in MPN obtained by the fermentation-tube method possibly indicate the state of pollution with coli form group, but is not indicative of the distinct difference of population.
The test for presence of members of coli form group by the deoxycholate agar method was apt to estimate coli form density lower than that obtained by the fermentation-tube method, but indicated the state of pollution by coli form group better than the latter. Coupled with simplification of the test, it seemed that deoxycholate agar method could be used as one of the quantitative coli form tests.View full abstractDownload PDF (562K) -
Shizuo SUZUKI1963 Volume 24 Issue 3-4 Pages 79-83
Published: November 30, 1963
Released on J-STAGE: October 16, 2009
JOURNAL FREE ACCESSThe standing crop and the activity of lake inhabiting bacteria were observed in Lake Yamanaka-ko, Yamanashi prefecture. The amount of bacteria of water and mud differs with different basins of one lake. The amount of organic substances in lake bottoms seems to be the most essential factor to decide the productivity of bacteria.
The vertical differences in the activity of water bacteria were observed by culture method. The multiplication of bacteria occurred at the surface and the bottom layer in winter, and at the 24 m layers in summer.
The vertical differences of bacterial activity were observed in bottom mud. The activity is very high in the surface layer of mud.View full abstractDownload PDF (403K) -
Takeo KATO1963 Volume 24 Issue 3-4 Pages 84-93
Published: November 30, 1963
Released on J-STAGE: October 16, 2009
JOURNAL FREE ACCESSThe Oguni River, which is one of the important tributaries of the Mogami River, starts from the western side of the Ou Mountain Range.
As is often the case with the rivers near the copper mine, the waters of some tributaries in the left side are influenced by the mineral deposits in the catchment area. Such is not the case with the branches in the right side.
So far as the main stream is concerned, the water quality undergoes a remarkable change after joined by the waters issuing from the hot springs in the drainage basin. According to the observations at the fixed station, there exists a linear relationship (positive correlation) between the contents of SO42- and Cl-. Generally speaking, the increase of the water level tends to decrease the concentrations of the chemical constituents. In the case of melt water, the circumstances are different from this.View full abstractDownload PDF (749K) -
Takeo KATO1963 Volume 24 Issue 3-4 Pages 94-103
Published: November 30, 1963
Released on J-STAGE: October 16, 2009
JOURNAL FREE ACCESSThe Shira-kawa River is one of the most important tributaries in the upper reaches of the Mogami River. This drainage system starts from Mt. Iide and is jointed by the Matsu-kawa River at Toyoda, Nagai City. In this paper, the geochemical features of the river are reported. The results are summarized as follows :
1. As for the water quality of the whole drainage system, samples taken from various stations show neutral reaction and, on the whole, they are poor in dissolved substances.
2. So far as the water quality of the trunk river is concerned, the chemical oxygen demand and the contents of chloride, sulfate and silicate ions increase with the increase of distance from its origin.
3. After joined by the Koshira-kawa River and the Hagiu-gawa River, the water quality of the main stream undergoes an abrupt change.
4. The examination of the analysed data at the Toyoda station revealed a linear relationship between calcium ion and each of chloride ion and bicarbonate ion. Regarding dissolved iron and silicate ion, the concentration peak occurs in April coincident with rapid thaws at the same observing station. Such is not the case with other mineral contents.View full abstractDownload PDF (731K) -
Takeo KATO1963 Volume 24 Issue 3-4 Pages 104-113
Published: November 30, 1963
Released on J-STAGE: October 16, 2009
JOURNAL FREE ACCESSThe Niu-gawa River, a tributary of the Mogami River, starts from the Funagata Volcano of the Ou Mountain Range.
Influenced by the mineral springs and the mineral deposits distributed in the drainage basin, the waters of the upper reaches are characterized by the large contents of SO42- and Ca2+. Throughout the drainage system, Cl- is regarded as a minor constituent of the dissolved substances. As for the water quality of the trunk river, the concentrations of SO42- and Ca2+ and the evaporation residue tend to decrease with the increase of distance from its origin respectively. According to the monthly observations in the fixed station of the main stream, the negative correlation is found between the water level and each of SO42-, Ca2+, Mg2+ content and the alkalinity.View full abstractDownload PDF (809K)
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