Correlation between cytochrome P450 1A (cyp1a) mRNA expression and ambient phenanthrene and pyrene concentration in Javanese Medaka Oryzias javanicus     

Rusni  Suhaila  Sassa  Mieko  Takehana  Yusuke  Kinoshita  Masato  Inoue  Koji 《Fisheries Science》2020,86(4):605-613

Fisheries Science - Cytochrome P450 1A (Cyp1a) catabolizes polycyclic organic compounds. In this study, we sequenced the cyp1a gene from two Javanese medaka Oryzias...  相似文献   

用城市规划方法来建造一个儿童化城市——对中国和日本几个不同居住区儿童游戏活动的调查研究( Ⅰ)(英文)   总被引：1，自引：0，他引：1  

木下勇  杨赉丽  中村攻  李平 《中国林学(英文版)》1999,(Z1)

在城市规划的发展过程中,从儿童游戏空间的角度来审视城市,是最近才开始的研究课题．在未来的城市范围内,保存和发展儿童游戏空间尤为重要．我们称之为城市中的游戏场地．城市的发展容易造成游戏场地的消失．本文将首先对北京市（ 中华人民共和国） 和东京（ 日本国） 的四个地区进行比较．在此基础上,对城市化进程中,与游戏有关的儿童年龄结构进行分析,得出一些与环境有关的主题  相似文献   

Chemical control of Haematobia irritans with 0.5% topical ivermectin solution in cattle.     

Y Uzuka  T Yoshioka  S Tanabe  G Kinoshita  T Nagata  K Yagi  H Funaki  H Hanyu  T Sarashina 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》1999,61(3):287-289

A field trial was conducted to evaluate the efficacy of a topical formulation of ivermectin administered at the dose of 500 micrograms/kg against horn flies (Haematobia irritans) in cattle. Eighty-eight cattle in four herds naturally exposed to horn flies were used in the trial. Replicates were formed of two herds. Within replicates, one herd was randomly allocated to the untreated control and the other to the ivermectin treatment group. Horn fly counts were taken on the treatment day (Day 0) and on Days 7, 14, 21, 28, and 35 post-treatment. There were no horn flies on any cattle in the treatment group, whereas all the control cattle were continuously infested by horn flies on each examination day.  相似文献   

The zooplankton biomass in the Sea of Japan     

Yuichi Hirota  & Seizo Hasegawa 《Fisheries Oceanography》1999,8(4):274-283

We examined seasonal, annual variation and horizontal distribution of zooplankton in the Sea of Japan from 1966 to 1990. Zooplankton was most abundant in the spring. The spring maximum appeared in February–March and in April–May in the southern and eastern parts of the study areas, respectively. In the summer and autumn, a secondary peak was most conspicuous in the eastern part. The difference between the estimated biomass at night and day was large in the spring and small in summer and autumn. The biomass in the offshore southern area peaked about every 3 years between 1966 and 1983, and increased abruptly in 1990. The density in the area north of 39°N or 40°N was high. Total biomass estimated in the upper 150 m layer in the Sea of Japan (10⁶ km²) was 9.5 × 10⁶ t in the daytime and 16.6 × 10⁶ t at night.  相似文献   

Cytological relationships among Eumelilotus species analysed using cytological observations of interspecific hybrids obtained by in vitro culture     

Sen Ha  Masahiko Maekawa  Fumiji Kita  Toshiro Kinoshita 《Euphytica》1998,101(1):17-22

Interspecific hybrid plants between Melilotus altissima (yellow flowers) and either M. alba (white flowers) or M. taurica (white flowers) and between M. suaveolens (yellow flowers) and M. wolgica (white flowers) which were inviable because of heavy chlorosis, were grown successfully by in vitro culture and reached the flowering stage. Pollen fertility of hybrid plants between M. altissima and M. alba was about 46% whereas hybrids between M. altissima and M. taurica and between M. suaveolens and M. wolgica showed about 25% and 18% of pollen fertility, respectively. All F₁s did not set any selfed seeds. Observing the pairing of chromosomes at metaphase I in the hybrid plants, it was revealed that the genomes of M. altissima and M. alba differ by a reciprocal translocation. This result could account for the partial sterility of pollen in the F₁ hybrids. On the other hand, hybrid plants between M. altissima and M. taurica and between M. suaveolens and M. wolgica showed normal pairing of chromosomes though pollen fertility of the hybrids was very low, suggesting that low pollen fertility was controlled by sterility gene(s). These results demonstrate that M. altissima and 7 other species of the subgenus Eumelilotus share the same chromosomal constitution. The only exception, M. alba, differs from the other 8 species by a segmental interchange. This revised version was published online in July 2006 with corrections to the Cover Date.  相似文献   

Blue stain fungi associated withTomicus piniperda (Coleoptera: Scolytidae) on Japanese red pine     

Hayato Masuya  Shigeru Kaneko  Yuichi Yamaoka 《Journal of Forest Research》1998,3(4):213-219

A number of various species of blue-stain fungi were isolated fromTomicus piniperda adults at various stages of development, as well as from the galleries, pupal chambers and sapwood underneath galleries on Japanese red pine. This study was an attempt to identify the species, composition of blue-stain fungi associated withT. piniperda, the frequency of occurrence of the fungi, and their role in the sapwood-staining of Japanese red pine in Tsukuba City, central Japan. Among the seven species of blue-stain fungi isolated, an undescribed species ofOphiostoma together withO. minus were the dominant species and closely associated withT. piniperda. These two species occurred on newly emerging adults more frequently than the overwintered adults.Hormonema dematioides was also associated with the beetle, however, its frequency of occurrence from the emerged new adults was very low. Although the two other species,O. ips andGraphium sp. were also isolated from emerged beetles, the frequency of these fungi from gallery systems suggested that they were accidentally carried byT. piniperda. Leptographium wingfieldii, known to be associated with the beetle in Europe, was also isolated at a very low frequency and the fungus seemed not to be closely associated with the beetle.Ophiostoma sp. andO. minus appear to be the most important causes of blue-stain of Japanese red pine sapwood after infestation byT. piniperda.  相似文献   

Production of transparent exopolymer particles by four diatom species     

Tsuyoshi Fukao  Katsunori Kimoto  Yuichi Kotani 《Fisheries Science》2010,76(5):755-760

The production of transparent exopolymer particles (TEP) by four diatoms, Coscinodiscus granii, Eucampia zodiacus, Rhizosolenia setigera, and Skeletonema sp., was examined. Most of the TEP in C. granii (74% of the maximum) were produced during the growth phase. In contrast, most of the TEP in E. zodiacus (73%), R. setigera (74%), and Skeletonema sp. (70%) were produced during the stationary and declining phases. The C. granii TEP production rate was highest in the growth phase, whereas those in E. zodiacus, R. setigera, and Skeletonema sp. were highest in the stationary–decline phase. The TEP concentrations per cell and the cell volume of C. granii were 34.97 ± 4.114 (mean ± SD) ng Xeq./cell (xanthan gum equivalents per cell) and 341.6 ± 56.33 fg Xeq./μm³, and were 23.01 and 4.32 times higher than the values obtained from the other three diatoms, respectively. The results suggest that the mechanisms of TEP production differ with growth stage and diatom species. Therefore, it is likely that the differences in TEP production among the diatom species influence the complexity of TEP dynamics in aquatic environments.  相似文献   

Development of simple sequence repeat markers in the halophytic turf grass <Emphasis Type="Italic">Sporobolus virginicus</Emphasis> and transferable genotyping across multiple grass genera/species/genotypes     

Chisato Endo  Naoki Yamamoto  Masaaki Kobayashi  Yukino Nakamura  Koji Yokoyama  Takamitsu Kurusu  Kentaro Yano  Yuichi Tada 《Euphytica》2017,213(2):56

  相似文献   

Removal of cadmium from scallop processing waste by washing with weak acid solution and utilization of useful constituents for organic fertilizer manufacturing     

Huifeng Ren  Yuichi Okamoto  Huijuan Jia  Ryoji Fukuda  Atsushi Kobayashi  Sumio Goto  Hideaki Endo  Tetsuhito Hayashi 《Fisheries Science》2008,74(1):187-192

ABSTRACT:   Hepatopancreases were washed four times with 2% acetic acid solution. In both the washed hepatopancreases and the supernatant of the washing solution, the residual cadmium (Cd) concentration was in accordance with the required standard for organic fertilizers. Hepatopancreases do not naturally contain high levels of nitrogen, but they do contain several amino acids which are useful for cultivation, and these were retained during the washing process. Although the condensed precipitate of the washing solution contained a considerable amount of Cd, Cd elution levels at the time of final disposal met judgment standard for special management industrial waste as a result of kneading and immobilizing with chelating adsorbent for treatment of contaminated soil. The volume of the precipitate of the washing solution was one-fifth of the original hepatopancreas, and the solid waste was suitable for burial at a final disposal site without further treatment.  相似文献   

Effect of an alcohol extract from a defatted soybean meal supplemented with a casein-based semi-purified diet on the biliary bile status and intestinal conditions in rainbow trout Oncorhynchus mykiss (Walbaum)     

Takeshi Yamamoto  Takanobu Goto  Yuta Kine  Yuta Endo  Yuichi Kitaoka  Tsuyoshi Sugita  Hirofumi Furuita  Yasuro Iwashita  & Nobuhiro Suzuki 《Aquaculture Research》2008,39(9):986-994

A feeding experiment was conducted to examine the effect of a supplemental ethanol extract from a defatted soybean meal on the biliary bile status and intestinal conditions of rainbow trout Oncorhynchus mykiss . A semi-purified control diet based on casein (Cont) and three diets supplemented with the extract (ES), bovine bile salts (BS) and their combination (ESBS) were fed to trout (10 g) for 6 weeks. The growth, feed efficiency ratio, fat digestibility and gallbladder- and hepato-somatic indices of fish fed diet ES decreased. Compared with this group, these parameters were improved in fish fed diet ESBS. The total biliary bile salt content was the lowest in fish fed diet ES and this group had a high proportion of chenodeoxycholyltaurine. The inclusion of the bile salts to diet ES (diet ESBS) increased the total biliary bile salt content. A similar trend was observed in the bile salt concentration of intestinal digesta. Although morphological changes occurred in epithelial cells of the distal intestine of fish fed diet ES, the histological features of fish fed diet ESBS were similar to those of fish fed diet Cont. These results indicate that alcohol-soluble substances of soybean meal cause physiological changes in the biliary bile and intestine of rainbow trout.  相似文献