全文获取类型
收费全文 | 1803篇 |
免费 | 167篇 |
国内免费 | 2篇 |
出版年
2023年 | 7篇 |
2022年 | 11篇 |
2021年 | 26篇 |
2020年 | 17篇 |
2019年 | 22篇 |
2018年 | 23篇 |
2017年 | 31篇 |
2016年 | 51篇 |
2015年 | 87篇 |
2014年 | 92篇 |
2013年 | 118篇 |
2012年 | 124篇 |
2011年 | 115篇 |
2010年 | 88篇 |
2009年 | 76篇 |
2008年 | 91篇 |
2007年 | 104篇 |
2006年 | 101篇 |
2005年 | 70篇 |
2004年 | 75篇 |
2003年 | 72篇 |
2002年 | 63篇 |
2001年 | 39篇 |
2000年 | 24篇 |
1999年 | 33篇 |
1998年 | 18篇 |
1997年 | 30篇 |
1996年 | 28篇 |
1995年 | 22篇 |
1994年 | 26篇 |
1993年 | 24篇 |
1992年 | 31篇 |
1991年 | 21篇 |
1990年 | 17篇 |
1989年 | 27篇 |
1988年 | 17篇 |
1987年 | 11篇 |
1986年 | 13篇 |
1985年 | 10篇 |
1984年 | 13篇 |
1982年 | 15篇 |
1981年 | 8篇 |
1980年 | 10篇 |
1978年 | 10篇 |
1974年 | 4篇 |
1973年 | 6篇 |
1972年 | 4篇 |
1971年 | 6篇 |
1970年 | 5篇 |
1960年 | 4篇 |
排序方式: 共有1972条查询结果,搜索用时 109 毫秒
101.
102.
Shirin Moossavi Shadi Sepehri Bianca Robertson Lars Bode Sue Goruk Catherine J. Field Lisa M. Lix Russell J. de Souza Allan B. Becker Piushkumar J. Mandhane Stuart E. Turvey Padmaja Subbarao Theo J. Moraes Diana L. Lefebvre Malcolm R. Sears Ehsan Khafipour Meghan B. Azad 《Cell host & microbe》2019,25(2):324-335.e4
103.
Lefebvre D Lips D Odberg FO Giffroy JM 《Animal : an international journal of animal bioscience》2007,1(8):1167-1178
Routinely performed painful procedures are of increasing interest and, in 2001 (Royal Order, May 17), Belgium prohibited docking in several vertebrates including horses. In 2004, opponents to this decision submitted a Bill (Doc51 0969/001) to Parliament, intending to obtain derogation for Belgian draught horses, which were traditionally docked. The Animal Welfare Council of Belgium, an official body advising the Minister of Public Health, was asked to evaluate this complex question, including biological, ethical and socio-economic aspects, on the basis of the available peer-reviewed studies. In this context, this study reviews legal aspects (overview of the European legislation), zootechnic aspects (uses of the Belgian draught horse) and biological aspects (pain potentially related to docking; horses' welfare linked to insect harassment and hygiene, communication and reproduction) of tail docking in draught horses. We conclude that (1) there is no benefit for horses in tail docking, including Belgian draught horses, (2) potential advantages of docking are essentially in favour of humans and these advantages could be scrupulously re-evaluated, taking into account practices of other countries. Therefore, there is no need to dock any horse other than for veterinary reasons. 相似文献
104.
Vera L. Trainer William P. Cochlan Aleta Erickson Brian D. Bill Frank H. Cox Jerry A. Borchert Kathi A. Lefebvre 《Harmful algae》2007,6(3):449-459
Several species of the toxigenic diatom Pseudo-nitzschia, together with low concentrations of domoic acid (DA) in shellfish have been observed in Puget Sound, Washington State, since 1991. However, for the first time in September 2003, high-density blooms of Pseudo-nitzschia forced the closure of recreational, commercial, and tribal subsistence shellfish harvesting in Puget Sound. Here we report on the environmental conditions associated with shellfish closures in two inland waterways of Washington State during the Fall 2005. In Sequim Bay, shellfish harvest losses occurred on September 12 following the measurement of elevated macronutrient levels on September 2, and a bloom of P. pseudodelicatissima (up to 13 million cells/L) on September 9. Ambient NH4 concentrations >12 μM (measured on September 2) were likely due to anthropogenic sources, ostensibly from sewage inputs to Sequim Bay. The closure of a Penn Cove commercial shellfish farm on October 16 was caused by a bloom of P. australis that followed a period of sustained precipitation, elevated Skagit River flow, and persistent southeasterly winds. The relative importance of a number of environmental factors, including temperature, stratification caused by rivers, and nutrient inputs, whether natural or anthropogenic, must be carefully studied in order to better understand the recent appearance of massive blooms of toxigenic Pseudo-nitzschia in the inland waterways of Washington State. 相似文献
105.
106.
C Delarue H Lefebvre S Idres F Leboulenger G Homo-Delarche I Lihrmann M Feuilloley H Vaudry 《Journal of steroid biochemistry》1988,29(5):519-525
The mode of action of serotonin (5-HT) in the regulation of frog adrenal steroidogenesis was studied in vitro using the perifusion system technique. Graded doses of 5-HT (from 10(-8) to 10(-6) M) increased both corticosterone and aldosterone production in a dose-dependent manner. Short pulses (20 min) of 10(-6) M 5-HT, administered at 130 min intervals within the same experiment, did not cause any desensitization phenomenon. Indomethacin (IDM; 5 microM), a cyclooxygenase inhibitor which induced a dramatic decrease in the spontaneous secretion of corticosteroids, did not impair the stimulatory effect of 5-HT on corticosterone and aldosterone production. In the absence of calcium, 5-HT (10(-6) M) was still able to stimulate corticosteroid production. Dantrolene (5 x 10(-5) M), a blocker of calcium mobilization from intracellular pools which significantly inhibited the spontaneous production of corticosteroids, did not suppress 5-HT-evoked corticosteroid secretion. These results show that 5-HT, stored in adrenal chromaffin cells, may act as a paracrine factor to stimulate adrenal steroidogenesis in the frog. Our data also indicate that the mechanism of action of 5-HT does not depend on prostaglandin biosynthesis. 相似文献
107.
Habib AA Chatterjee S Park SK Ratan RR Lefebvre S Vartanian T 《The Journal of biological chemistry》2001,276(12):8865-8874
108.
109.
110.
Five typhloplanoids from the Australian East Coast are reported, three of them new to science. Two taxa are members of Promesostomidae: Vauclusia conica n.g. n.sp., characterised by a cone-shaped stylet, the presence of a female bursa and a very long, partially-swollen female duct; Brinkmanniella australiensis n.sp. has a funnel-shaped stylet with a smooth distal tip. Pilamonila bimascula n.g. n.sp. is a representative of the Solenopharyngidae, characterised by a stylet within a cirrus. The known species found are Ceratopera axi and Ptychopera scutulifer. 相似文献