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Volume 27 (1991)
- Issue 2 Pages 1-
- Issue 1 Pages 7-
Volume 27, Issue 2
Displaying 1-8 of 8 articles from this issue
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Tadahiro MORI, S. YAMASHITA, K. SATAKE1991 Volume 27 Issue 2 Pages 1-6
Published: December 25, 1991
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSSulfate reduction rates of the sedkment at the depth of 0-5cm were measured for 15 month from September, 1984 to November 1985 in eutrophicated blackish Lake Nakanoumi, Japan.
The sulfate reduction rates were usually high at the surface sediment and decreased with increased depth. The average sulfate reduction rate of the sediment (0-3cm) at the central position (St.4) and heavily ponuted area Yonago Bay (St.11) was 53.8±25.0 and 104.4±72.1 nmol day-1 ml-1, annual estimated decomposition rate of organic matter was 14.2 and 27.4 g-cm-2, respectively.View full abstractDownload PDF (664K) -
Zen'ichiro KAWABATA, Yasushi ISERI, Masahiko SASAKI1991 Volume 27 Issue 2 Pages 7-10
Published: December 25, 1991
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSSuppression of dinoflagellate Peridinium bipes bloom by ultraviolet (UV) radiation was surveyed in a mesocosm. The mesocosm was 5m long, 5m wide, 4m deep, and contained a UV lamp 123cm long with a output power of 30W emitting 253.7nm light. The mesocosm was placed in a reservoir. Almost all live cells were eliminated from the water within 2days. Transparency increased from 2.9m to higher than 4.5m in 4 days. Although ammonium nitrogen increased, no notable changes were observed in the concentrations of the important nutrients for algal growth such as orthophosphate and nitrate nitrogen. Therefore UV radiation was taken to be an effective way of suppression of P. bipes bloom. According to the results obtained from the mesocosm experiment, the number of UV lamps and the days required for killing all the cells in a reservoir were estimated.View full abstractDownload PDF (358K) -
Tsugio KOBASHI, Yoshiaki DEGUCHI, Teizoh HIGASHI, Jinya YAZAKI, Osami ...1991 Volume 27 Issue 2 Pages 11-17
Published: December 25, 1991
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSGrowth characteristics of Phormidium luridum isolated from fish culture pond were investigated in various nutrient concentrations.Cultivations were carried out at 25°C in continuous light illumination with cool-white fluorecent lamps at 1, 3001x.
Maximl growth was obtained at an initial pH value of 8.3 in Gorham's medium. Nitrite and nitrate were significantly effective for the growth of P.luridum as nitrogen souces.A good growth was observed at the concentrations of 1.8mg/l for phosphorus, 1.6mg/l for potasium, 5mg/l for magnesium, 1.7mg/l for iron and 14mg/l for calcium.P.luridum showed a low tolerance for sodium chloride at 400mg/l.View full abstractDownload PDF (574K) -
Susumu NAKASHIMA, Masakazu YAGI1991 Volume 27 Issue 2 Pages 19-25
Published: December 25, 1991
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSIn order to clarify the mechanism of growth of a musty-odor producing cyanobacterium Oscillatoria brevis isolated in Norway, the effects of iron forms on the growth and geosmin production of O.brevis were studied using laboratory cultures.
O.brevis grew well and produced geosmin in the EDTA-free CT medium as well as in the presence of EDTA.Thus, O.brevis showed an ability to utilize colloidal iron and even iron oxides for its growth. This suggests that O.brevis would be expected to produce a specific high affinity iron chelator (siderophore) in the chelator-free medium.
In the presence of bathophenanthroline disulfonate (BPDS), a strong Fe (II) chelating agent, O.brevis was able to grow.Furthermore, O.brevis was capable of growing in the medium containing a microbial siderophore, desferrioxamine B (DESF), instead ofEDTA.
These results show that O.brevis has an excellent ability to utilize a variety of iron forms including Fe (III) -EDTA, Fe (II) -BPDS, Fe (III) -DESF chelates, colloidal ferric hydroxide and more thermodynamically stable crystalline iron oxides (Fe2O3, Fe3O4) in comparison with musty-odor producing cyanobacteria such as Anabaena macrospora, Phormidium tenue and Oscillatoria tenuis isolated from Lake BiwaView full abstractDownload PDF (1011K) -
Takahiro OUCHIYAMA, Norio SUGIURA, Yuhei INAMORI, Ryuichi SUDO1991 Volume 27 Issue 2 Pages 27-33
Published: December 25, 1991
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSMorphological and environmental's factor's characteristics of ciliated protozoa, the genus VorticeliaandPseudovoticellain entrophicated Lake Kasumigaura were studied. V.campanula and V.convallaria were often appeared in the lake through the yera. V. picta increased from winter to spring season, while V.vestita was often observed from spring to early summer. In the study of environmental factors, it was found thatV. campanulaand V.convallaria could inhibit at a high alkaline pH value 9.47, further V.vestita could do at allcaine pH value 8.74. From the result of the appearance of ciliates, the pollution level in Lake Kasumigaura was corresponded to α-mesosaprobic zone during summer, while inwinter β-mesosaprobic zone.View full abstractDownload PDF (788K) -
Hiroshi FUKUSHIMA, Tsuyako KO-BAYASHI, Mika KURIHARA, Harue FUJITA1991 Volume 27 Issue 2 Pages 35-37
Published: December 25, 1991
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSDownload PDF (288K) -
Hiroshi FUKUSHIMA, Tsuyako KO-BAYASHI, Mika KURIHARA, Harue FUJITA1991 Volume 27 Issue 2 Pages 38-45
Published: December 25, 1991
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSDownload PDF (13455K) -
on the cases of the hairworms derived from drinking water in JapanTerumasa SAKAMOTO, Kazuhiko KOHSAKA, Iwao INOUE1991 Volume 27 Issue 2 Pages 47-52
Published: December 25, 1991
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSIn mid-Autumn 1983, the outbreak for the hairworm to be discharged through a tap with drinking water occured within a certain district of Kanagawa prefecture in Japan.
After microscopic examination this worm was recognized as a kind of parasite belonging to Gordioidea, Nematomorpha.
The specific characters of this worm were as follows.
1) This worm, preserved in 70% alcohol, was darkbrown in color and about 280mm long by 1.2 mm broad at the thickest portion.
2) The body surface was covered with a smooth cuticula assumed the crossed light fibrous lines.
3) At a short distance anterior to the point of bifurcation were found a crescent-shaped ridge and the round cloacal opening.
By the chazacteristic signs mentioned above the specimenwas identified asGordiussp. (Family; Gordiidae) .
It appears to be the first report that the hairworm was detected from drinking water in Japan. Regarding the same case of the hairworm, other 4 cases have been recorded up to now in Japan and all worms were also identified as Gordiu ssp..
This article describes the biology of the hairworms, the cases found in drinking water, the parasitological and clinical aspects of the human infection, and the preventive measures inremov ing them.View full abstractDownload PDF (5823K)
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