全文获取类型
收费全文 | 686篇 |
免费 | 64篇 |
专业分类
林业 | 16篇 |
农学 | 8篇 |
基础科学 | 4篇 |
82篇 | |
综合类 | 135篇 |
农作物 | 26篇 |
水产渔业 | 10篇 |
畜牧兽医 | 374篇 |
园艺 | 7篇 |
植物保护 | 88篇 |
出版年
2022年 | 5篇 |
2021年 | 5篇 |
2020年 | 7篇 |
2019年 | 9篇 |
2018年 | 14篇 |
2017年 | 15篇 |
2016年 | 22篇 |
2015年 | 11篇 |
2014年 | 18篇 |
2013年 | 26篇 |
2012年 | 29篇 |
2011年 | 39篇 |
2010年 | 17篇 |
2009年 | 18篇 |
2008年 | 30篇 |
2007年 | 41篇 |
2006年 | 38篇 |
2005年 | 18篇 |
2004年 | 25篇 |
2003年 | 26篇 |
2002年 | 25篇 |
2001年 | 27篇 |
2000年 | 28篇 |
1999年 | 12篇 |
1998年 | 9篇 |
1997年 | 7篇 |
1996年 | 6篇 |
1995年 | 4篇 |
1994年 | 6篇 |
1992年 | 6篇 |
1991年 | 11篇 |
1990年 | 10篇 |
1989年 | 15篇 |
1988年 | 12篇 |
1987年 | 8篇 |
1986年 | 8篇 |
1985年 | 9篇 |
1980年 | 5篇 |
1978年 | 7篇 |
1977年 | 5篇 |
1976年 | 8篇 |
1974年 | 4篇 |
1972年 | 6篇 |
1971年 | 7篇 |
1970年 | 4篇 |
1969年 | 6篇 |
1967年 | 5篇 |
1966年 | 4篇 |
1963年 | 4篇 |
1955年 | 4篇 |
排序方式: 共有750条查询结果,搜索用时 281 毫秒
741.
742.
Smith KL Robison BH Helly JJ Kaufmann RS Ruhl HA Shaw TJ Twining BS Vernet M 《Science (New York, N.Y.)》2007,317(5837):478-482
The proliferation of icebergs from Antarctica over the past decade has raised questions about their potential impact on the surrounding pelagic ecosystem. Two free-drifting icebergs, 0.1 and 30.8 square kilometers in aerial surface area, and the surrounding waters were sampled in the northwest Weddell Sea during austral spring 2005. There was substantial enrichment of terrigenous material, and there were high concentrations of chlorophyll, krill, and seabirds surrounding each iceberg, extending out to a radial distance of approximately 3.7 kilometers. Extrapolating these results to all icebergs in the same size range, with the use of iceberg population estimates from satellite surveys, indicates that they similarly affect 39% of the surface ocean in this region. These results suggest that free-drifting icebergs can substantially affect the pelagic ecosystem of the Southern Ocean and can serve as areas of enhanced production and sequestration of organic carbon to the deep sea. 相似文献
743.
744.
Shaw E 《Science (New York, N.Y.)》1957,125(3255):987-988
745.
Shaw RR 《Science (New York, N.Y.)》1948,108(2798):148-151
746.
Lee KH Dinner AR Tu C Campi G Raychaudhuri S Varma R Sims TN Burack WR Wu H Wang J Kanagawa O Markiewicz M Allen PM Dustin ML Chakraborty AK Shaw AS 《Science (New York, N.Y.)》2003,302(5648):1218-1222
The immunological synapse is a specialized cell-cell junction between T cell and antigen-presenting cell surfaces. It is characterized by a central cluster of antigen receptors, a ring of integrin family adhesion molecules, and temporal stability over hours. The role of this specific organization in signaling for T cell activation has been controversial. We use in vitro and in silico experiments to determine that the immunological synapse acts as a type of adaptive controller that both boosts T cell receptor triggering and attenuates strong signals. 相似文献
747.
Roy Shaw C. D. Evans Shirley Munson G. R. List K. Warner 《American Journal of Potato Research》1973,50(12):424-430
Two pilot plant runs of 23 hours each were made with peeled and unpeeled potatoes. Samples of chips were taken at intervals and subjected to sensory evaluation after acceclerated storage at 60 C and room temperature storage for 1, 3, 6, and 9 weeks. Samples of oil were taken at intervals and analyzed for color free fatty acids, peroxide values, and copper. Chips from peeled and unpeeled potatoes were similar in all evaluations. There was a significant increase in yield of chips from unpeeled potatoes. 相似文献
748.
Visceral leishmaniosis is a widespread and potentially fatal disease of dogs and humans common in the Mediterranean region, the Middle East, and South America. Canine leishmaniosis is most frequently treated with the drugs meglumine antimoniate, allopurinol, amphotericin B, or a combination of meglumine antimoniate and allopurinol. Therapy with the currently used drugs often achieves temporary clinical improvement and changes in immunologic parameters with restoration of the ability to mount parasite-specific cell mediated responses and decrease in anti-leishmanial antibody titers. However, treatment usually does not prevent relapse of disease or eliminate parasite carriage. Due to the current lack of an ultimate and effective therapy for canine leishmaniosis, new drugs, delivery systems and treatment strategies are necessary to achieve a consistent parasitological cure in infected dogs. 相似文献
749.
E Gómez M Muñoz A Rodríguez JN Caamaño N Facal C Díez 《Reproduction in domestic animals》2009,44(2):194-199
In contrast to the embryos derived from live animals, the embryos produced in vitro undergo increased damage and reduced survival after cryopreservation, particularly when produced with serum. In medium containing serum, retinoic acid increases cell numbers in the inner cell mass and the trophectoderm without altering their relative proportions in the bovine blastocyst. In this work, in medium without serum, we analyzed the contribution of retinoic acid to the development of blastocyst and survival to vitrification, and found a strong cell reduction in the inner mass when compared to the trophectoderm. Day-6 in vitro -produced morulae were treated for 24 h with retinoic acid (0.7 and 1.4 μ m ) and subsequently cultured without additives for a further 24 h period. Day-8 blastocyst production and cell counts in hatched blastocysts were unaffected by retinoic acid. However, Day-7 expanded, vitrified embryos produced with retinoic acid 1.4 μ m survived at lower rates than controls when cultured after warming. Vitrification greatly reduced cell numbers in the inner mass (p < 0.0001), while cells in the trophectoderm remained unaltered. Differential cell counts analysis in blastocysts should be taken up to replace unspecific determination of total cells to appreciate substantial modifications in their exact terms. The strong reduction we found in the inner cell mass could explain why in vitro survival to cryopreservation is sometimes scarcely informative on the viability of the embryo after transfer to recipients. 相似文献
750.
Near-infrared reflectance spectroscopy (NIRS) was used to develop calibration curves for determining the fat acidity of whole-kernel and ground rough rice with 13% moisture content at 25°C. Partial-leastsquares regression (PLSR) uses the optimal calibration curve for wholekernel rough rice to measure the coefficient of determination (r2) of validation and standard error of prediction (SEP) of 0.87 and 0.83 mg of KOH/100 g of dry matter, respectively. However, the optimal calibration curve for ground rough rice has a higher r2 of validation and lower SEP of 0.94 and 0.73 mg of KOH/100 g of dry matter, respectively. From 10 to 40°C, the temperature effect causes an increase of 0.24 mg of KOH/100 g of dry matter/°C in the predicted fat acidity of whole-kernel rough rice. 相似文献