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排序方式: 共有365条查询结果,搜索用时 15 毫秒
101.
Tsutomu Ikeda Shuji Hosoya Yoichi Tomimura Kengo Magara Isao Takano 《Journal of Wood Science》1999,45(3):233-237
To develop a new nonchlorine bleaching technology, hardwood and softwood kraft pulps, before and after oxygen-alkali predelignification, were treated with dilute sulfuric acid solutions (pH 1.0-1.8) at 100°C for 1 h and then extracted with aqueous sodium hydroxide at 70°C for l h. Hardwood kraft pulp was successfully bleached. The delignification selectivity was similar to that seen with oxygen-alkali bleaching; and it was greatly enhanced by the addition of sodium nitrate and sodium nitrite. The sulfuric acid bleaching can replace the presently adopted oxygen and chlorine stages if the additives are allowed. This bleaching process was also effective for oxygen-bleached hardwood kraft pulp, but it was less effective for softwood kraft pulp and oxygen-bleached softwood kraft pulp. The effectiveness of the addition of sodium nitrate and sodium nitrite was more apparent for softwood kraft pulp than for hardwood kraft pulp.Part of this report was presented at the 7th International Symposium on Wood and Pulping Chemistry, Beijing, July 1993 相似文献
102.
Hidehiro Kondo Takami Morita Maki Ikeda Chihiro Kurosaka Aiko Shitara Yuka Honda Reiko Nozaki Takashi Aoki Ikuo Hirono 《Fisheries Science》2010,76(1):161-165
Expressed sequence tag (EST) analyses were performed with the aim of identifying enzyme genes in the liver of the Bleeker’s squid Loligo bleekeri. Of the 768 ESTs identified and sequenced, 669 were grouped into 324 clusters. Of these clusters, 123 comprising 245 ESTs were found to be homologous to genes reported to date. Among these, 43 clusters were annotated as enzymes according to the Enzyme Commission (EC) numbering system. Two EC groups, oxidoreductases and hydrolases, possessed a large number of ESTs. A cluster homologous to the glutathione peroxidase, an enzyme in the oxidoreductase group, contained 16 ESTs, which accounted for 2.4% of the total ESTs sequenced. There are three serine proteases, three cathepsins, two triacylgricerol lipases, and two chitinases among the clusters homologous to the enzymes in the hydrolase group. Since the squid liver functions in the digestive process, these enzymes would be involved in food digestion. Our data provide information on the various types of enzymes expressed in the squid liver and may provide a useful basis for further characterization of these enzymes. 相似文献
103.
Tomoko Ikeda Keiichi Nagata Hiroshi Honda Toshio Shono Toshio Narahashi 《Pest management science》1998,52(4):337-342
Sikimi plant (also known as Japanese star anise), Illicium anisatium, is toxic to mammals. Extracts of Sikimi were studied for their insecticidal activity against the larvae of mosquito, Culex quinquefasciatus, and for their mechanism of action on ion channels. Crude methanol extract and its ethyl acetate-soluble fractions were insecticidally active, with EC50 values of 63·0 μg ml-1 and 43·7 μg ml-1, respectively. The ethyl acetate-soluble fraction was perfused through the bathing solution and the current induced by a brief (10 ms) application of GABA by pressure ejection through pipette electrode was recorded by the whole-cell patch clamp technique. The extract suppressed GABA-induced currents irreversibly with an EC50 value of 0·42 μg ml-1. The time constant of current fitted to the single exponential function was shortened by the ethyl acetate-soluble fraction at concentrations ranging from 0·1 μg ml-1 to 10 μg ml-1 in a concentration-dependent manner. It was concluded that Sikimi extracts decreased the affinity of GABA for its binding site on the GABA receptor, thereby suppressing GABA-induced currents. © 1998 SCI 相似文献
104.
Kelly Vargas Yoshiho Asakura Minoru Ikeda Nobuhiko Taniguchi Yasuhiro Obata Katsuyuki Hamasaki Kotaro Tsuchiya Shuichi Kitada 《Fisheries Science》2008,74(3):533-543
ABSTRACT: Allozyme variation of the littleneck clam Ruditapes philippinarum was evaluated in four samples from Nameishi and Matsuo in the Ariake Sea, Ryugatake and Ushibuka in the Shiranui Sea off Kyushu Island, Japan, and in one sample from Jinzhou, China, in the Bohai Sea. A Ruditapes bruguieri sample imported from the Korean Bay off Nampo, North Korea was also studied. Among the R. philippinarum samples, heterozygosity varied from 0.265 to 0.301 and F IS estimates indicated significant homozygosity excess in 15 of 40 loci analyzed. Deviations from Hardy–Weinberg equilibrium were significant in all samples ( P < 0.05). Pairwise F ST estimates indicate that genetic differences between the Chinese and Japanese samples were very low, but significantly different from zero. Mixture proportions with 95% confidence intervals of Chinese R. philippinarum in Nameishi and Matsuo were estimated at 0.4098 [0.2512, 0.5705] and 0.4899 [0.3262, 0.6540], respectively. However, genetic invasion of stocked Chinese R. philippinarum into wild populations in the Ariake Sea remains uncertain due to the low precision of the estimates caused by the high similarity of allele frequencies between Jinzhou and the Ariake Sea. 相似文献
105.
106.
Hiroyuki Ikeda Akihiko Kamoshita Junko Yamagishi Makara Ouk Bunna Lor 《Paddy and Water Environment》2008,6(1):91-103
In order to assess direct seeding of rice technology to cope with future agricultural labor shortage in Cambodia, agronomic
experiments were conducted in 2005 and 2006 to compare direct seeding with transplanting under three water conditions (non-flooded,
shallow flooded, and deep flooded conditions) with/without weed control by herbicides (bentazone and cyhalofop-butyl) for
two Cambodian rice varieties (shorter stature and early maturity Sen Pidao, taller stature and longer maturity Phka Rumduol).
Average rice yield in 2 years was lower in direct seeding (341 g m−2) than transplanting (404 g m−2), but interaction components with year, varieties, water conditions, and weed management were significant, and the attained
maximum yield of direct seeding (510 and 464 g m−2 for Phka Rumduol variety in shallow flooded condition with weeding in 2005 and 2006, respectively) was similar to that of
transplanting. Plant length and dry weight of rice were reduced in non-flooded and deep flooded conditions compared with shallow
flooded condition, and grain yield was the highest in shallow flooded condition. Yield advantage of Phka Rumduol over Sen
Pidao increased under direct seeding, particularly under non-flooded conditions in 2005 because weed infestation was more
suppressed in Phka Rumduol even without weeding. Increase in 100 g m−2 of weed infestation prior to heading (dry weight basis) reduced about 20% of attainable yield with weed control. This study
identified importance of stature and growth duration of rice varieties and presence of standing water as well as the weed
control, in order to develop and extend direct seeding in the Cambodia. 相似文献
107.
108.
109.
110.
Chuma T Ikeda T Maeda T Niwa H Okamoto K 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》2001,63(9):1027-1029
Cecal contents (16 samples/each flock) of broilers derived from 212 flocks were investigated for colonization of Campylobacter from 1995 to 1999 in the southern part of Japan, and the isolates were tested for antimicrobial susceptibilities. C. jejuni-positive flocks numbered 42 (19.8%) and C. coli-positive ones 26 (12.3%); Campylobacter spp. were recovered from 68 flocks (32.1%) in total. MICs of ampicillin, erythromycin (EM), tetracycline, nalidixic acid (NA), norfloxacin (NFLX), and ofloxacin (OFLX) to these 68 Campylobacter isolates were determined. Quinolone-resistant Campylobacter isolates numbered 22 (32.4%). All the isolates except one were cross-resistant to NA, OFLX, and NFLX. A high frequency of quinolone-resistance was found in both C. jejuni and C. coli, whereas a high level of EM-resistance was found in only C. coli strains. All C. jejuni isolates were sensitive to EM. 相似文献