全文获取类型
收费全文 | 250篇 |
免费 | 7篇 |
国内免费 | 1篇 |
专业分类
林业 | 30篇 |
农学 | 14篇 |
基础科学 | 1篇 |
35篇 | |
综合类 | 24篇 |
农作物 | 18篇 |
水产渔业 | 22篇 |
畜牧兽医 | 76篇 |
园艺 | 18篇 |
植物保护 | 20篇 |
出版年
2022年 | 9篇 |
2021年 | 7篇 |
2020年 | 4篇 |
2019年 | 8篇 |
2018年 | 11篇 |
2017年 | 12篇 |
2016年 | 7篇 |
2015年 | 5篇 |
2014年 | 6篇 |
2013年 | 23篇 |
2012年 | 9篇 |
2011年 | 13篇 |
2010年 | 13篇 |
2009年 | 12篇 |
2008年 | 14篇 |
2007年 | 6篇 |
2006年 | 7篇 |
2005年 | 6篇 |
2004年 | 5篇 |
2003年 | 3篇 |
2002年 | 5篇 |
2001年 | 2篇 |
2000年 | 2篇 |
1999年 | 6篇 |
1997年 | 2篇 |
1995年 | 3篇 |
1994年 | 2篇 |
1992年 | 3篇 |
1991年 | 2篇 |
1990年 | 4篇 |
1989年 | 1篇 |
1988年 | 4篇 |
1987年 | 2篇 |
1986年 | 2篇 |
1984年 | 1篇 |
1983年 | 1篇 |
1981年 | 4篇 |
1980年 | 6篇 |
1979年 | 1篇 |
1978年 | 2篇 |
1977年 | 2篇 |
1976年 | 3篇 |
1975年 | 2篇 |
1974年 | 1篇 |
1972年 | 1篇 |
1971年 | 1篇 |
1970年 | 4篇 |
1969年 | 1篇 |
1967年 | 3篇 |
1946年 | 1篇 |
排序方式: 共有258条查询结果,搜索用时 0 毫秒
111.
Localization of a novel RNA-binding protein, SKIV2L2, to the nucleus in the round spermatids of mice
Osman BA Kawashima A Tamba M Satoh E Kato Y Iki A Konishi K Matsuda M Okamura N 《The Journal of reproduction and development》2011,57(4):457-467
In our previous study (Kawashima et al., Biol Reprod 2009; 80: 1293-1304), we suggested that the first cycle of spermatogenesis recovered from busulfan-induced temporary arrest was a good model system to analyze the proteins expressed at the specific stages of spermatogenesis in the mouse, and this has been confirmed in the present paper. Namely, six-week-old mice were injected with busulfan at 20 mg/kg body weight. The germ cells except for the undifferentiated spermatogonia disappeared by 32 days after injection. The surviving spermatogonia started to proliferate, and spermatogenesis was entirely recovered about 77 days after injection. By proteome analysis of the busulfan-treated testis during the process of recovery of spermatogenesis, we identified a protein that was expected to be expressed in the spermatogenic cells as Superkiller viralicidic activity-2-like-2 (SKIV2L2). Skiv2l2 mRNA was found in the kidney, epididymis and heart as well as the testis. In the testis, Skiv2l2 mRNA was shown to be highly expressed in the spermatocytes at stages I to VI. On the other hand, SKIV2L2 protein was found to be predominantly localized in the nuclei of round spermatids. In accordance with the fact that SKIV2L2 belongs to the Ski2 family within the superfamily 2 of RNA helicases, it has been shown that SKIV2L2 has both the RNA-binding and ATPase activities. 相似文献
112.
113.
Osman J 《Science (New York, N.Y.)》1946,104(2711):578-579
114.
Leist M Ghezzi P Grasso G Bianchi R Villa P Fratelli M Savino C Bianchi M Nielsen J Gerwien J Kallunki P Larsen AK Helboe L Christensen S Pedersen LO Nielsen M Torup L Sager T Sfacteria A Erbayraktar S Erbayraktar Z Gokmen N Yilmaz O Cerami-Hand C Xie QW Coleman T Cerami A Brines M 《Science (New York, N.Y.)》2004,305(5681):239-242
Erythropoietin (EPO) is both hematopoietic and tissue protective, putatively through interaction with different receptors. We generated receptor subtype-selective ligands allowing the separation of EPO's bioactivities at the cellular level and in animals. Carbamylated EPO (CEPO) or certain EPO mutants did not bind to the classical EPO receptor (EPOR) and did not show any hematopoietic activity in human cell signaling assays or upon chronic dosing in different animal species. Nevertheless, CEPO and various nonhematopoietic mutants were cytoprotective in vitro and conferred neuroprotection against stroke, spinal cord compression, diabetic neuropathy, and experimental autoimmune encephalomyelitis at a potency and efficacy comparable to EPO. 相似文献
115.
116.
Abstract In vitro‐grown Chrysanthemum morifolium Ramat. cultivars Bright Golden Anne, Deep Luv, and Lucido were exposed to elevated mannitol, sucrose, or sorbitol concentrations to see if their response to this osmotic stress mimics that of in vivo plants enduring water deficit. The relative efficacy of the three osmotic agents at manifesting a response was also evaluated. Tissue osmolarity paralleled media mannitol and sorbitol concentration for all three cultivars. Shoot growth correspondingly decreased with increased osmolarity applied during the rooting phase. These responses generally resembled those of water‐stressed greenhouse plants. The degree of response varied with cultivar; ‘Lucido’ was the most sensitive and ‘Bright Golden Anne’ the least. Sucrose (metabolized by the plants) failed to elicit consistent osmotic stress symptoms; instead it enhanced both shoot and root growth. In vitro stress‐induced symptoms were produced in both proliferation and rooting stages, but consistent shoot growth reduction with increasing levels of incorporated osmotic agent was only observed during rooting. Plants did not retain the osmotic adjustment when they were subsequently subcultured from the stress treatments back to the control medium. 相似文献
117.
Resistance of 20 F2 Solarium chacoense Bitter clones to the Colorado potato beetle,Leptinotarsa decemlineata (Say), was measured in a field test. Levels of total glycoalkaloids (TGA) and composición of the glycoalkaloid mixtures in foliage of the clones were also determined. Clones with either commersonine or dehydrocommersonine as the major foliar glycoalkaloid were significantly more resistant (lower damage ratings, fewer larvae and adult insects) than clones with solanine and chaconine. Damage ratings were negatively correlated (r = -0.67, p = 0.01) with foliar TGA levels. The results indicate that the types of glycoalkaloids present in the foliage ofS. chacoense may be as important as the level of TGA in limiting damage and numbers of insects. 相似文献
118.
This study reports the effects of shifting cultivation at slashing stage on soil physicochemical properties at Bandarban Sadar Upazila in Chittagong Hill Tracts of Bangladesh. At this initial stage of ... 相似文献
119.
120.
Pepper production is affected by several viral diseases in Samsun, Turkey. To determine the identity of these viruses, a total
of 313 samples from field-grown peppers were collected during surveys in 1998 and 1999, and tested by enzyme linked immunosorbent
assay (ELISA). Six viruses,Alfalfa mosaic virus (AMV),Cucumber mosaic virus (CMV),Potato virus Y (PVY),Tomato mosaic virus (ToMV),Tobacco mosaic virus (TMV) andTomato spotted wilt virus (TSWV) were detected in the samples. Of 313 plants tested, 42 were doubly infected, and TMV+PVY (15.4%) was the most common
double infection. This is also the first report of AMV in pepper fields in Turkey. The effect of some weed species that may
act as reservoir of these viruses was also investigated in the region and of 24 weed species belonging to 15 families tested,
16 were found to be infected with at least one virus.Amaranthus retroflexus (Redroot pigweed) appeared to be a common host of CMV, PVY, ToMV, TMV and TSWV, whereasHibiscus trionum (Venice mallow) was recorded as a new weed host of PVY and TSWV. The majority of weed species found to be virus infected
were very common in the pepper growing areas of the region. This indicates that pepper fields contaminated with these weeds
are under risk of viral infections.
http://www.phytoparasitica.org posting July 21, 2005. 相似文献