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排序方式: 共有118条查询结果,搜索用时 8 毫秒
111.
Nakamuta N Kobayashi S 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》2004,66(11):1365-1370
Proteins encoded by p63 gene a have structural similarity with tumor suppressor p53, and were thought to induce cell cycle arrest and apoptosis during development. The p63 proteins are also expressed in the basal cells of many epithelial tissues in the adult, and supposed to play important roles in maintaining the epidermal stem cells. Previously, we reported the p63 expression in the testis of mouse embryos, suggesting their involvement in the growth arrest and apoptosis of testicular germ cells (Nakamuta and Kobayashi, J. Vet. Med. Sci. 65:853-856). In this study, we investigated the timing of this p63 expression in the germ cells during migration and colonization to the gonads. Immunohistochemical analysis of mice from embryonic day (E) 7.5 to E12.5 demonstrated that p63 positive reactivity was seen as early as E8.5 when the founder cells of germ cells, primordial germ cells (PGCs), were located in the hind gut epithelium, but PGCs were negative for p63 at E7.5 when they first appeared. p63 is expressed as six isoforms, resulting from alternative splicing at C-terminus and by the use of two promoters that generate variations at N-terminal end. RT-PCR analyses suggested that different types of p63 mRNAs were likely to be expressed in PGCs during development. These results imply that p63 may be involved in the regulation of PGC development by controlling the gene expression required for their migration and colonization to the gonads. 相似文献
112.
Quitain AT Sato N Daimon H Fujie K 《Journal of agricultural and food chemistry》2003,51(27):7926-7929
Hydrothermal treatment of an outer layer of a bark of Hinoki (Chamaecyparis obtusa) tree was investigated qualitatively for the possibility of utilizing residual forest biomass to produce valuable chemicals. Experiments were carried out in a semibatch reactor apparatus that allows the study of the effect of reaction temperatures in a single run. Gas chromatography-mass spectrometry analyses show the presence of useful chemicals such as furfural, aromatic compounds (1,3-di-tert-butyl benzene and 2,4-di-tert-butyl phenol), and fatty acids (myristic acid, palmitic acid, and stearic acid) in the products. 相似文献
113.
Mitamura Hiromichi Arai Nobuaki Hori Masakazu Uchida Keiichi Kajiyama Makoto Ishii Mitsuhiro 《Fisheries Science》2020,86(1):77-85
Fisheries Science - The marbled flounder Pseudopleuronectes yokohamae, a flatfish found in temperate coastal waters, is an important commercial species in the northwestern Pacific Ocean, but little... 相似文献
114.
Seiji Ohshimo Mari Yoda Nobuaki Itasaka Norimasa Morinaga Toshio Ichimaru 《Fisheries Science》2006,72(4):855-859
ABSTRACT: The purpose of this study was to determine the growth and reproductive characteristics of round scad Decapterus maruadsi in the East China Sea. The characteristics regarding growth and reproduction of round scad based on otolith reading and gonad histology, respectively, were estimated. The von Bertalanffy's growth model for round scad was estimated as follows:
FL t = 342[1 − exp{−0.55( t + 0.58)}], (1 < t < 7)
where FL t is fork length (mm) at age in years t . The maturation stage of the ovary was observed by histological techniques. June was the main spawning period; the maturation and migratory nucleus stage of the oocyte was observed when the gonad somatic index value was approximately greater than 4. 相似文献
FL
where FL
115.
Aoyagi M Kamoi T Kato M Sasako H Tsuge N Imai S 《Journal of agricultural and food chemistry》2011,59(20):10893-10900
In normal onion (Allium cepa), trans-S-1-propenyl-L-cysteine sulfoxide is transformed via 1-propenesulfenic acid into propanethial S-oxide, a lachrymatory factor, through successive reactions catalyzed by alliinase and lachrymatory factor synthase (LFS). A recent report showed that suppression of the LFS activity caused a dramatic increase in thiosulfinates previously reported as "zwiebelane isomers". After purification by recycle high-performance liquid chromatography and subsequent analyses, we established the planar structure of the putative "zwiebelane isomers" as S-3,4-dimethyl-5-hydroxythiolane-2-yl 1-propenethiosulfinate, in which two of the three molecules of 1-propenesulfenic acid involved in the formation gave the thiolane backbone, and the third molecule gave the thiosulfinate structure. Of at least three stereoisomers observed, one in the (2'R,3'R,4'R,5'R)-configuration was collected as an isolated fraction, and the other isomers were collected as a combined fraction because spontaneous tautomerization prevented further purification. Both fractions showed inhibitory activities against cyclooxygenase-1 and α-glucosidase in vitro. 相似文献
116.
Hiroyuki Ura Naruto Furuya Kazuhiro Iiyama Masatomo Hidaka Kenichi Tsuchiya Nobuaki Matsuyama 《Journal of General Plant Pathology》2006,72(2):98-103
Rice plants with bacterial leaf-sheath browning and grain rot were observed in Fukuoka Prefecture in Japan during the autumn
seasons of 1995 and 1996. Burkholderia spp. were consistently isolated from the infected leaf sheaths and grains. These isolates were pathogenic and induced symptoms
of seedling rot, grain rot, and leaf-sheath browning in rice plants, as well as in some orchidaceous plants (cymbidium, dendrobium,
and oncidium leaves), gladiolus leaves, and onion bulbs. On the basis of morphological, physiological and pathological tests,
and species-specific polymerase chain reaction, the isolates were identified as belonging to either Burkholderia glumae or Burkholderia gladioli. B. gladioli, as well as B. glumae, attacked rice plants after artificial inoculation and reproduced the symptoms similar to those after natural infections.
We confirmed that rice is an additional natural host of B. gladioli. It is clarified that bacterial grain rot of rice is caused not only by B. glumae but also by B. gladioli. 相似文献
117.
Shoji Hashimoto Nobuaki Tanaka Tomonori Kume Natsuko Yoshifuji Norifumi Hotta Katsunori Tanaka Masakazu Suzuki 《Journal of Forest Research》2007,12(3):209-221
Soil CO2 production seasonality at a number of depths was investigated in a temperate forest in Japan and in a tropical montane forest
in Thailand. The CO2 production rates were evaluated by examining differences in the estimated soil CO2 flux at adjacent depths. The temperate forest had clear temperature seasonality and only slight rainfall seasonality, whereas
the tropical montane forest showed clear rainfall seasonality and only slight temperature seasonality. In the temperate forest,
the pattern of seasonal variation in soil respiration was similar at all depths, except the deepest (0.65 m–), and respiration
was greater in summer and less in winter. The contribution of the shallowest depth (around 0.1 m) was more than 50% of total
soil-surface CO2 flux all year round, and the annual mean contribution was about 75%. CO2 production mostly appeared to increase with temperature in shallower layers. In contrast, in the tropical forest, soil CO2 production seasonality appeared to differ with depth. The CO2 production rate in the shallowest layer was high during the rainy season and low during the dry season. Soil CO2 production at greater depths (0.4 and 0.5 m–) showed the opposite seasonality to that in the shallower layer (around 0.1 m).
As a result, the contribution from the shallow depth was greatest in the tropical forest during the rainy season (more than
90%), whereas it decreased during the dry season (about 50%). CO2 production appeared to be controlled by soil water at all depths, and the different ranges of water saturation seemed to
cause the difference in seasonality at each depth. Our results suggest the importance of considering the vertical distribution
of soil processes, particularly in areas where soil water is a dominant controller of soil respiration. 相似文献
118.
Takayuki Takebe Takeo Kurihara Nobuaki Suzuki Kentaro Ide Hideki Nikaido Yosuke Tanaka Satoshi Shiozawa Hitoshi Imaizumi Shukei Masuma Yoshitaka Sakakura 《Fisheries Science》2012,78(2):343-350
We conducted a rearing experiment on Pacific bluefin tuna (PBT) larvae, which originated from one female broodstock, and determined
the growth history of the larvae to clarify when the growth difference occurs. We investigated the otolith microstructure
of the PBT larvae to examine the individual growth history and to predict the age and body size at the onset of individual
growth difference. Since total length (TL) of fish can be back-calculated from otolith radius, we back-calculated TLs of 100
fish of 19 days post hatch (dph) divided into three size groups (small, intermediate, large). Growth difference was recognized
from 3 dph (mouth opening), and the difference became larger thereafter. Growth of large-size fish was assumed to be promoted
by the feeding conditions of PBT larvae. 相似文献