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排序方式: 共有47条查询结果,搜索用时 15 毫秒
21.
Penny Swanson M. Bernard M. Nozaki K. Suzuki H. Kawauchi W. W. Dickhoff 《Fish physiology and biochemistry》1989,7(1-6):169-176
The present study was designed to obtain basic endocrine information on GTH I and GTH II in previtellogenic and prespermatogenic
coho salmon (immature). Levels of GTH II in pituitary extracts were 6.5 ± 2.0 and 6.7 ± 2.0 pg/μg pituitary protein in male
and female fish, respectively. In contrast, the pituitary content of GTH I was approximately 100-fold higher than GTH II (1.302
± .22 and 1.173 ± .21 ng/μg pituitary protein in male and female fish, respectively). Plasma levels of GTH II in immature
salmon were not detectable by RIA whereas plasma GTH I levels were approximately 0.62 ± 0.12 and 0.78 ± 0.13 ng/ml in male
and female fish, respectively. Highly purified coho salmon GTH I and GTH II stimulated testicular testosterone production
and ovarian estradiol productionin vitro in a similar manner, though GTH II appeared more potent than GTH I. Therefore, it appears that although the salmon pituitary
contains predominantly GTH I prior to puberty, the gonad can respond to both GTH I and GTH II. 相似文献
22.
Kazufumi Osako Mohammed Anwar Hossain Akane Kawashima Koichi Kuwahara Akira Okamoto Yukinori Nozaki Katsuyasu Tachibana 《Fisheries Science》2006,72(1):173-178
ABSTRACT: Year-round change in gelation of bassy chub ( Kyphosus lembus ) meat, collected from October 2001 to September 2002 off the coast of Nagasaki, was investigated. The fish meat exhibited a similar high gel-forming ability for all seasons, including pre- and post-spawning seasons. Freshwater washing of the meat did not improve its gel-forming ability. It was concluded that bassy chub meat could be used for thermal gel production in all seasons. 相似文献
23.
Yosuke Kikuchi Satomi Nozaki Miki Makita Shoji Yokozuka Shin-ichi Fukudome Takashi Yanagisawa Seiichiro Aoe 《Plant foods for human nutrition (Dordrecht, Netherlands)》2018,73(3):161-165
Metabolic syndrome is a risk factor for cardiovascular diseases and has become increasingly common in Japan. Epidemiological studies show inverse associations between intake of whole wheat grains and metabolic syndrome, but few dietary intervention trials have investigated the effect of whole wheat grain consumption. It was investigated whether a diet in which refined wheat bread (RW diet) was substituted by whole grain wheat bread (WW diet) would reduce visceral fat obesity in Japanese subjects. A randomized double-blind placebo-controlled intervention study was conducted in 50 Japanese subjects with body mass index (BMI)?≥?23 kg/m2. Subjects were randomly assigned WW (WW group) or RW diets (RW group) for 12 weeks. Blood samples and computed tomography scans were obtained every 6th week. The WW group showed decrease (?4 cm2) in visceral fat area (VFA) (p <?0.05), whereas the RW group showed no significant changes. These time-dependent changes were significantly different between the groups. WW diet led to significant and safe reductions in VFA in subjects with BMI?≥?23 kg/m2. WW diet may contribute to preventing visceral fat obesity. 相似文献
24.
25.
Kouju Nozaki Takejiro Takamura 《The Journal of Horticultural Science and Biotechnology》2013,88(4):728-734
SummaryThe relationship between the intensity of flower colour and changes in the content of the main anthocyanins under various controlled temperatures was examined in order to clarify the effects of high temperature on flower colouration in six pink flower genotypes of greenhouse chrysanthemum (Chrysanthemum morifolium Ramat.). Poor colouration of flowers was observed at 30°C in all genotypes except ‘Chatoo’. This genotype showed little difference in flower colour between different temperature treatments. The degree of change in flower colour differed depending on the genotype, whereas no clear differences in flower colouring were observed between Summer – Autumn flowering and Autumn-flowering genotypes. All genotypes showed lower contents of the two anthocyanins tested [cyanidin 3-O-(6’’-O-monomalonyl- -glucopyranoside) and cyanidin 3-O-(3’’,6’’-O-dimalonyl- -glucopyranoside)] at higher temperatures. Therefore, flower colour changes were attributable to changes in these two main anthocyanins. Differences in colouration between genotypes and temperature conditions were also detectable in values that were measured using a colorimeter. Changed parameters that were visually verifiable were the a* value, representing the degree of red colour, and the C* value, representing chroma. For ‘Sei-Monako’, which showed visually greater differences between temperature treatments, the a* and C* values were low under high temperature conditions. On the other hand, in ‘Chatoo’, the differences detected by eye and those in a* and C* values between temperature treatments were small. In addition, the present results indicate that mean temperature is more important than either day or night temperature in determining the degree of flower colouration. 相似文献
26.
Amal Kumar Biswas Jun Nozaki Michio Kurata Kenji Takii Hidemi Kumai & Manabu Seoka 《Aquaculture Research》2006,37(16):1662-1670
This study was carried out to investigate the suitability of Artemia enriched with docosahexaenoic acid (DHA) and choline as live food on the growth and survival rate of the Pacific bluefin tuna (PBT; Thunnus orientalis) larvae. The PBT larvae were fed either Artemia enriched with oleic acid (Diet 1), DHA (Diet 2), DHA+choline 1.0 mg L?1 (Diet 3) and DHA+choline 2.0 mg L?1 (Diet 4) or striped knifejaw larvae (Diet 5, reference diet), in duplicate for 12 days. Enrichment of Artemia with DHA significantly increased the DHA levels to 13.9, 13.8 and 12.5 mg g?1 on a dry matter basis in Diets 2, 3 and 4 respectively; however, the levels were significantly lower than the reference diet (26.9 mg g?1 dry matter basis; Diet 5). Although growth and survival rate were significantly improved by the enrichment of Artemia with DHA and choline, the improvement was negligible compared with the enhanced growth and survival rate of the fish larvae‐fed group (P<0.05). The results demonstrated that enriched Artemia does not seem to be the right choice to feed the PBT larvae perhaps because of the difficulties in achieving the correct balance of fatty acid with higher DHA/EPA from Artemia nauplii. 相似文献
27.
Nature and mechanisms of oxygenases 总被引:6,自引:0,他引:6
28.
Imura A Tsuji Y Murata M Maeda R Kubota K Iwano A Obuse C Togashi K Tominaga M Kita N Tomiyama K Iijima J Nabeshima Y Fujioka M Asato R Tanaka S Kojima K Ito J Nozaki K Hashimoto N Ito T Nishio T Uchiyama T Fujimori T Nabeshima Y 《Science (New York, N.Y.)》2007,316(5831):1615-1618
alpha-klotho was identified as a gene associated with premature aging-like phenotypes characterized by short lifespan. In mice, we found the molecular association of alpha-Klotho (alpha-Kl) and Na+,K+-adenosine triphosphatase (Na+,K+-ATPase) and provide evidence for an increase of abundance of Na+,K+-ATPase at the plasma membrane. Low concentrations of extracellular free calcium ([Ca2+]e) rapidly induce regulated parathyroid hormone (PTH) secretion in an alpha-Kl- and Na+,K+-ATPase-dependent manner. The increased Na+ gradient created by Na+,K+-ATPase activity might drive the transepithelial transport of Ca2+ in cooperation with ion channels and transporters in the choroid plexus and the kidney. Our findings reveal fundamental roles of alpha-Kl in the regulation of calcium metabolism. 相似文献
29.
Nobuko Naito Kunimasa Suzuki Masumi Nozaki Penny Swanson Hiroshi Kawauchi Yasumitsu Nakai 《Fish physiology and biochemistry》1993,11(1-6):241-246
The salmonid pituitary produces two chemically distinct gonadotropins (GTHI and GTHII). Ultrastructural characteristics of
GTHI- and GTHII-producing cells were studied in the trout pituitary with electronmicroscopic immunocytochemistry using antisera
against salmon GTHIβ- and IIβ-subunits. In pituitaries from vitellogenic fish, GTHI-cells were characterized by numerous dilated
cisternae of the granular endoplasmic reticulum (GER) and a small number of Iβ-positive granules (diameter, 100–300 nm), whereas
GTHIIβ-immunoreactivity was found on granules (diameter, 200–400 nm) and large globules (diameter, 500–4000 nm) in apparently
different cells (GTHII-cells). Distinct cellular distributions of GTHI and GTHII were maintained during gametogenesis, although
morphological characteristics of GTHI- and GTHII-cells overlapped each other due to changes in number and size of the granules,
globules and cisternae of the GER. Interestingly, the globules in the GTHI-cells were immunonegative for GTHIβ, although in
the GTHII-cells they were always stained with GTHIIβ-antiserum. These results confirm that GTHIβ and GTHIIβ are synthesized
in distinctly different cell-types in the salmonid pituitary and indicate that morphological characteristics cannot be used
to distinguish these two cell-types.
Résumé L'hypophyse des salmonidés produit deux gonadotropines (GTHI et GTHII) chimiquement distinctes. Les caractéristiques ultrastructurales des cellules produisant la GTHI et la GTHII ont été étudiées par immunocytochimie en microscopie électronique en utilisant des anticorps dirigés contre les sousunités GTHIβ et GTHIIβ de saumon. Chez les poissons en vitellogenèse, les cellules à GTHI se caractèrisent par un réticulum endoplasmique granulaire (REG) contenant de nombreuses citernes dilatées et un petit nombre de granules positives à la GTHIβ (diamètre 100–300 nm) tandis qu'une immunoréactivité à la GTHII était trouvée sur des granules (diamètre 200–4000 nm) et de grands globules (diamètre 500–4000 nm) dans des cellules apparemment différentes (cellules à GTHII). Des distributions cellulaires distinctes de la GTHI et la GTHII se sont maintenues à des stades plus avancées de la gamétogenèse, bien que les caractéristiques morphologiques des cellules à GTHI et GTHII se recoupent suite à des changements dans le nombre et la taiile des granules, des globules et des citernes du REG. II est à remarquer que les globules prśents dans les cellules à GTHI étaient immunonégatifs à la GTHIβ alors que dans les cellules à GTHII ils étaient toujours marqués par l'anticorps contre la GTHIIβ. Ces résultats confirment que, dans l'hypophyse des salmonidés, les GTHIβ et GTHIIβ sont synthetisées dans des types cellulaires différents et indiquent que des caractéristiques morphologiques ne peuvent être utilisées pour distinguer ces deux types cellulaires.相似文献
30.
Tadanori Nozaki Akira Kumazaki Takato Koba Keiko Ishikawa Hiroshi Ikehashi 《Euphytica》1997,96(1):115-123
Common bean, Phaseolus vulgaris L. is intercropped or relay cropped with maize in many Andean highlands of Colombia and Peru.
Breeding beans for the target multiple cropping systems is essential for the development of productive and sustainable agriculture
for the Andean smallholders. Outline of the breeding programme should follow the farming system approach with the establishment
of on-farm trials and early farmers involvement. Bean breeding is oriented to minimize intercrop competition and to stabilize
complementarity with maize. Genetic traits needed for improved varieties are divided as follows : traits not interacting with
the cropping systems, traits specific to intercrops and traits related with socioeconomic and seed quality aspects. Screening,
prebreeding and recombination nursery are better made under sole cropping while varietal improvement and on-farm trials are
conducted under the target multiple cropping systems. Breeding schemes may involve recurrent, pedigree and bulk hybrid selection.
The given application concerns the genetic improvement of P. coccineus, P. polyanthus and interspecific hybrids of P. vulgaris
for both simultaneous and relay intercropping in Colombia and Peru. Earliness, cold tolerance, resistance to fungus diseases
(mainly Ascochyta leaf blight and anthracnosis) and seed yield potential were the major objectives of the bean improvement
programme. Priority has been given to the exploitation of the large diversity available in the secondary gene pool of common
bean.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献