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1.
Studies in marine microbiology relevant to the cultivation of lobster in Fatty Basin were made.
Biomass of bacteria and allied microorganisms in whole seawater column of the basin was very small (2×104 gC), but a large biomass was found in the sediments (3×105 gC).
The decomposition of chitin occurred chiefly in the sediments. The rate of decomposition (500 g/day) was approximately half
of the rate of production. However, the remaining production was considered not to be involved in the chitin cycle of the
basin. This hypothesis was supported by the results of the analysis of the budget of organic matter in the area.
Shell disease of lobster caused by chitinoclastic bacteria was detected, although it was not serious. A destructive yeast
parasite of crustaceans,Metschnikowia, was collected only from a crab in the basin.
This report is dedicated to Professor KenSugawara for his 70 years old anniversary. 相似文献
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Processes of heterogeneous condensation are investigated. We consider the situation that vapor and solid grains of which material is other than that of the vapor coexist and the saturation of the vapor increases with time. If the contact angle of the condensate to the solid is small (?90°), the condensate will be formed as mantles coating the solid grains but only a fraction of the solid grains will be coated by mantles. The ratio of core-mantle grains to bare solid grains in number will be smaller as the density of the vapor and the time scale of saturation increase are large. Actual calculations are made by adopting H2O ice as the mantle material and magnesium silicate as the core material. 相似文献
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It is shown theoretically that the emission efficiency of amorphous grains with radii smaller than 100 Å has a -1-dependence in the wavelength region longer than 100 , whereas those of crystalline, metallic, and larger amorphous grains are proportional to -2 in far infrared. Astrophysical implications of the amorphous grains are discussed. 相似文献
6.
Humitake Seki Hideshi Abe Yukuya Yamaguchi Shun-ei Ichimura 《Journal of Oceanography》1974,30(3):151-156
About 106 of total bacteria (direct microscopic count) or heterotrophic bacteria (colony count with Medium 2216E) and about 104 of petroleumlytic bacteria (oil-oxidizing bacteria) were enumerated per square centimeter of the surface of petroleum globules suspended in the topmost 10 meters of water from a station (22°00.2N, 125°51.9E) in the western North Pacific central water, where about 107 of total bacteria, about 103 of heterotrophic bacteria and about 10 of petroleumlytic bacteria were enumerated per liter of seawater. 相似文献
7.
Yusuke Okazaki Osamu Seki Takeshi Nakatsuka Tatsuhiko Sakamoto Minoru Ikehara Kozo Takahashi 《Journal of Oceanography》2006,62(5):639-648
Cycladophora davisiana, a radiolarian species dwelling at mesopelagic depths, is known as a representative glacial fauna due to its unique distribution
during glacial periods. In the present ocean, abundant production of C. davisiana is only observed in the Okhotsk Sea, indicating an adaptation of C. davisiana for seasonal sea-ice covered conditions. We found pronounced abundant production of C. davisiana during the early to middle Holocene in the Okhotsk Sea, suggesting more favorable conditions for C. davisiana than the present Okhotsk Sea. In order to clarify the reason, oceanographic conditions during the Holocene were reconstructed
based on biomarkers, lithogenic grains including ice-rafted debris (IRD), biogenic opal, and total organic carbon (TOC) in
two sediment cores from the Okhotsk Sea. These indicators suggest that the pronounced C. davisiana production may be attributed to: 1) a supply to mesopelagic depths under intensified stratification of fine organic particles
derived from coccolithophorids, bacteria, and detrital materials; and 2) cold, well-ventilated intermediate water formation. 相似文献
8.
Osamu Kameya Tatsuhiko Hasegawa Naomi Hirano Munezo Seki Makoto Tosa Yoshiaki Taniguchi Keiya Takakubo 《Astrophysics and Space Science》1986,118(1-2):449-451
CS(J=1–0), C34S(J=1–0), and CH3OH(10–00A and E) emission lines in the core region of molecular cloud associated with NGC 7538 have been surveyed at angular resolution of 33. Distribution of CS column density shows two prominent peaks. Both blue and red wings in CS line are most prominent at 30 northwest of IRS 11.Paper presented at the IAU Third Asian-Pacific Regional Meeting, held in Kyoto, Japan, between 30 September–6 October, 1984.This work was carried out under the common use observation program at the Nobeyama Radio Observatory (NRO). NRO, a branch of the Tokyo Astronomical Observatory, University of Tokyo, is a cosmic radio observing facility open to outside users. 相似文献
9.
The linear polarization of the reflection nebula R Mon/NGC 2261 has been observed since November 1991 with a multi-channel polarimeter at Dodaira Observatory, one of the branches of the National Astronomical Observatory of Japan. Results of the observations are reported. 相似文献
10.
Microorganisms and their activity were studied in the lower reaches of the River Teshio with special reference to the mixing of freshwater and seawater. The nature and processes observed therein were similar to those studied in the Nanaimo River, and they could be generalized as common in the subtemperate zone. The profile of microbial activity reflected the transition from freshwater to seawater in the River Teshio. 相似文献