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排序方式: 共有116条查询结果,搜索用时 203 毫秒
11.
Ebihara M Sekimoto S Shirai N Hamajima Y Yamamoto M Kumagai K Oura Y Ireland TR Kitajima F Nagao K Nakamura T Naraoka H Noguchi T Okazaki R Tsuchiyama A Uesugi M Yurimoto H Zolensky ME Abe M Fujimura A Mukai T Yada Y 《Science (New York, N.Y.)》2011,333(6046):1119-1121
A single grain (~3 micrograms) returned by the Hayabusa spacecraft was analyzed by neutron activation analysis. This grain is mainly composed of olivine with minor amounts of plagioclase, troilite, and metal. Our results establish that the Itokawa sample has similar chemical characteristics (iron/scandium and nickel/cobalt ratios) to chondrites, confirming that this grain is extraterrestrial in origin and has primitive chemical compositions. Estimated iridium/nickel and iridium/cobalt ratios for metal in the Itokawa samples are about five times lower than CI carbonaceous chondrite values. A similar depletion of iridium was observed in chondrule metals of ordinary chondrites. These metals must have condensed from the nebular where refractory siderophile elements already condensed and were segregated. 相似文献
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Sato T Takada M Shibuya H Shirai W Matsuo K 《Journal of veterinary medicine. A, Physiology, pathology, clinical medicine》2004,51(1):23-26
'Granular cell' tumor observed in the malar subcutis of a Djungarian hamster was examined to determine its cellular origin. Histologically, the tumor consisted of a solid growth of oval or spindle-shaped large cells with abundant cytoplasm filled with eosinophilic granules that were periodic acid-Schiff-positive and diastase-resistant. Immunohistochemically, the tumor cells were positive to anti-vimentin and anti-desmin antibodies and a few cells showed positivity to anti-actin antibody as well. They did not react to myoglobin, S-100 protein, and glial fibrillary acidic protein (GFAP). Electron microscopic studies revealed that the tumor cells had pinocytotic vesicles, dense plaque and microfilaments. The first granular cell variant of myogenic tumor reported here in Djungarian hamsters was differentiated from granular cell tumor of Schwann cell origin. 相似文献
14.
Okada T Shirai K Yamamoto Y Arai T Ogawa K Hosono K Kato M 《Science (New York, N.Y.)》2006,312(5778):1338-1341
X-ray fluorescence spectrometry of asteroid 25143 Itokawa was performed by the x-ray spectrometer onboard Hayabusa during the first touchdown on 19 November 2005. We selected those data observed during relatively enhanced solar activity and determined average elemental mass ratios of Mg/Si = 0.78 +/- 0.09 and Al/Si = 0.07 +/- 0.03. Our preliminary results suggest that Itokawa has a composition consistent with that of ordinary chondrites, but primitive achondrites cannot be ruled out. Among ordinary chondrites, LL- or L-chondrites appear to be more likely than H-chondrites. No substantial regional difference was found on the asteroid surface, indicating its homogeneity in composition. 相似文献
15.
Kaji N Okuno A Ohno-Ichiki K Oki H Ishizawa H Shirai M Asai F 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》2012,74(9):1185-1189
Plasma profiles of glucose, insulin and lipids were examined in the male WBN/Kob-Lepr(fa) (fa/fa) rat, a new model of type 2 diabetes (T2D), in comparison with age-matched original male WBN/Kob (lean) rats. The fa/fa rats developed hypertriglycemia, obesity and hyperglycemia from 5, 7, and 9 weeks of age, respectively. Plasma insulin levels in fa/fa rats were significantly higher than those in lean rats at 5 weeks of age, but after 11 weeks of age gradually declined to the levels in lean rats. HOMA-IR, a measure of insulin resistance status, showed that fa/fa rats had insulin resistance. The fa/fa rat has the potential to become an important animal model of T2D with obesity. 相似文献
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17.
Surveys of beni-zuwai crab were conducted to clarify the bathymetric distribution and fecundity of beni-zuwai crab populations
without the effects of bias due to fisheries. The results were compared with previous ones obtained at the heavily exploited
Yamato Bank. Two sites in the northern part of the Sea of Japan, off southwest Hokkaido (200–2500 m deep) and West-Tsugaru
Basin (300–1900 m deep), both of which are experiencing low exploitation levels, were surveyed in August to September, 2007.
There was an abundance of morphologically immature crabs of both sexes in the depth range 1800–2100 m, and a few occurred
at depths >2200 m. Immature crabs of <40 mm carapace width were found to migrate downslope to depths of 1800–2100 m and then
to migrate upslope during molting for males and after maturity molting for females. Although data were lacking for depths
>2000 m at the West-Tsugaru Basin, these relationships were significant for the pooled data of both localities, and they were
similar to the results at the Yamato Bank. Clutch fullness of ovigerous females was negatively correlated with depth, which
indicates that the low clutch fullness was not induced by fisheries, although the similar phenomenon observed at the Yamato
Bank had previously been considered to be due to fishery effects. 相似文献
18.
Yosuke Amano Masayuki Kuwahara Toshiro Takahashi Kotaro Shirai Kodai Yamane Tatsuya Kawakami Kazuki Yokouchi Hiroshi Amakawa Tsuguo Otake 《Fisheries Science》2018,84(5):799-813
Biwa salmon Oncorhynchus sp. is endemic to Lake Biwa, Japan, where it is an important commercial and recreational fisheries species. However, no information is currently available on its population structure and migration ecology. Therefore, here we evaluated whether otolith Sr/Ca, Ba/Ca and 87Sr/86Sr ratios can be used as natural signatures in Biwa salmon and then used these to determine the natal origins of lake-migration-phase individuals and spawning adults, and the homing ability of spawning adults in the Lake Biwa water system. Quadratic discriminant function analysis demonstrated that the lake-migration school comprised individuals with multiple origins, including rivers to the east, west and north of Lake Biwa, and that the homing rate of spawning adults was low (18 out of 80 individuals), with ca. 78% of fish straying into non-natal rivers. However, this straying behaviour was not spatially random, with fish tending to migrate upstream in rivers neighbouring their natal rivers. The high rate of straying in spawning adults is considered important for establishing and maintaining this species, which is highly adapted to life in the Lake Biwa water system where environmental disturbances often occur. 相似文献
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20.
Mohammad Ziaur Rahman Seiji Uematsu Toru Takeuchi Kayo Shirai Yasushi Ishiguro Haruhisa Suga Koji Kageyama 《Journal of General Plant Pathology》2014,80(4):348-365
A new disease of rose was noticed in Chiba Prefecture of Japan in 1968, and the pathogen was initially identified as Phytophthora megasperma based on morphological characteristics. Similar Phytophthora isolates have since been collected from rose plants in Chiba, Kanagawa, and Shizuoka Prefectures. In 2005, several Phytophthora isolates were recovered from crowns of strawberry plants in Hokkaido Prefecture. These were considered to be members of a new species. In this study, we re-examined all these isolates using morphological and physiological studies and a multilocus phylogenetic analysis. The rose and strawberry isolates were mostly similar morphologically and physiologically, with some exceptions. The rose isolates differed significantly from P. megasperma sensu stricto and other related Phytophthora species. The rose and strawberry isolates had external proliferation of sporangia, characteristic funnel-shaped oogonia, predominantly paragynous antheridia, and fast growth rates of 10.5 mm/24 h at an optimum temperature of 28 °C. In the multilocus phylogenetic tree constructed using sequences from the rDNA ITS regions, rDNA LSU, and the translation elongation factor 1-α, β-tubulin and coxI genes, they formed a distinct monophyletic group in clade 7 with strong bootstrap support. The rose and strawberry isolates separated into two distinct groups. The results indicate that the rose and strawberry isolates constitute two separate species, designated here as Phytophthora nagaii and P. fragariaefolia. 相似文献