首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   70873篇
  免费   3965篇
  国内免费   34篇
林业   3224篇
农学   2529篇
基础科学   477篇
  8700篇
综合类   11415篇
农作物   2606篇
水产渔业   3640篇
畜牧兽医   36607篇
园艺   907篇
植物保护   4767篇
  2018年   1053篇
  2017年   1129篇
  2016年   1056篇
  2015年   907篇
  2014年   1136篇
  2013年   2628篇
  2012年   2058篇
  2011年   2461篇
  2010年   1683篇
  2009年   1751篇
  2008年   2592篇
  2007年   2364篇
  2006年   2326篇
  2005年   2125篇
  2004年   2194篇
  2003年   2165篇
  2002年   2036篇
  2001年   2367篇
  2000年   2376篇
  1999年   1925篇
  1998年   912篇
  1997年   821篇
  1996年   782篇
  1995年   861篇
  1994年   843篇
  1993年   767篇
  1992年   1523篇
  1991年   1542篇
  1990年   1662篇
  1989年   1507篇
  1988年   1450篇
  1987年   1340篇
  1986年   1384篇
  1985年   1336篇
  1984年   1128篇
  1983年   1025篇
  1982年   628篇
  1979年   1004篇
  1978年   795篇
  1977年   717篇
  1976年   676篇
  1975年   719篇
  1974年   766篇
  1973年   830篇
  1972年   803篇
  1971年   748篇
  1970年   729篇
  1969年   744篇
  1967年   658篇
  1966年   631篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
In the framework of the international obligations subscribed by the Italian government, the Italian Ministry of Health should provide the European Union (EU) (European Commission, European Food Safety Authority – EFSA) with a set of data and information related to the report and the spread of zoonoses and to the activities put in place for monitoring and control of zoonoses. In 2008, the Italian Ministry of Health commissioned the Istituto G. Caporale (ICT) to implement an information system able to provide information and data on the monitoring and control of zoonoses in the national territory, in accordance with the national and community legislation. The system is part of the e‐Government process that involves all public administrations of the EU and refers to the use of information and communication technologies for the digital processing of documents in order to obtain simplification and interoperability of administrative procedures through the Internet, as defined in the strategic lines published by the National Centre for Information Systems in Public Administration (DigitPA) in 2009–2011.  相似文献   
992.
993.
994.
The mean serum folate concentrations of Large White sows were compared between one group of 13 animals, 43–80 days pregnant and another group of 9 animals at weaning when the litters were 28–30 days old. The mean concentration was higher in sows at weaning (p<0.05) and the lowest levels were found in sows no more than 51 days pregnant (p<0.05).  相似文献   
995.
Abstract

Extract

In a recent publication in this journal(1) Bailey, KM. 1994. Anthelmintic use in goats and the effect of route of administration. New Zealand Veterinary Journal, 42: 378. [Taylor &; Francis Online], [Web of Science ®] [Google Scholar], administration of oral and injectable moxidectin (Vetdectin, Cyanamid N.Z. Ltd) to goats was found to result in faecal egg count reductions of 0% and 84% respectively, in infections that were predominantly composed of Ostertugia spp. The author considered that these results raised issues pertaining to the relative effectiveness of different routes of anthelmintic administration in goats and further suggested, as the animals were suffering from “water belly” at the time of treatment, that the occurrence of this syndrome may also have affected the pharmacodynamics of the anthelmintic.  相似文献   
996.
Summary

The incidence, size and location of mammary nodules were established in 10 practices in The Netherlands by the clinical examination of bitches in which oestrus was controlled with proligestone (P), 331 animals, or medroxyprogesterone acetate (MAP), 341 animals and in 339 animals never medicated with such compounds.

In comparison with the unmedicated controls and the P‐medicated animals of comparable age the incidence of mammary nodules of all sizes was significantly increased in the MAP‐medicated animals.

There was no significant difference in nodule incidence between the P‐medicated animals and the control animals.

Based on the assumption that nodules above a certain size are most likely tumours, these results indicate that oestrus control with MAP stimulates tumour development even in animals medicated for less than four years.

The practical value of the reported differences, especially in relation to the subsequent requirement for surgical removal of tumours in bitches, medicated for oestrus control, is discussed.  相似文献   
997.
Summary

Transmission of F.hepatica under natural conditions was analysed in a three year programme. The variables used were the indirect haemagglutination (IHA) technique, worm establishment in tracer lambs and the population dynamics, infection rate and shedding pattern of Lymnaea truncatula.

It is concluded that fluke eggs, infected snails and metacercariae on herbage can survive the winter in the Netherlands. Metacercarial availability was positively correlated to the amount of rainfall in the grazing period. The role of developed eggs that survive the winter is important, because this results in earlier infections in the herd.

The use of the serological diagnosis method IHA is important to detect F. hepatica infection in an early stage. Use of cellophane paper on floats is a useful method for determining the shedding pattern of cercariae from L. truncatula. It is concluded that collection of metacercariae on cellophane floats, inventarization of L. truncatula and its infection level are useful tools for the prediction of liverfluke infections.  相似文献   
998.
Summary

The disposition and urinary excretion of ciprofloxacin (CIP) following intravenous (IV) or intramuscular (IM) administration of 7.5 mg/kg body weight in sheep (n = 5) was studied. The intravenous plasma concentration curve was best described pharmacokinetically by a two‐compartment open model, while the intramuscular administration data fitted better to a one‐compartment open model. Mean elimination half‐lives after IV and IM administration were 72 and 184 minutes, respectively. The absorption of intramuscularly administered CIP in sheep was fast: maximal plasma concentration (Cmax) was reached quickly (tmax 31.93 min) and attained values of 0.69 ± 0.27 mg/l. The bioavailability was 49%. The urinary data showed a significant decrease in the elimination rate constant of CIP when CIP was administered intramuscularly. The other parameters calculated did not display differences between the two routes of administration. The results obtained suggest that when CIP was administered by the IM route in the assayed dose, it was able to maintain serum concentrations above the MIC of most common pathogens over an 8‐hour period.  相似文献   
999.
Transmissible spongiform encephalopathies (TSEs) or prion diseases are unique disorders that are not caused by infectious micro-organisms (bacteria or fungi), viruses or parasites, but rather seem to be the result of an infectious protein. TSEs are comprised of fatal neurodegenerative disorders affecting both human and animals. Prion diseases cause sponge-like degeneration of neuronal tissue and include (among others) Creutzfeldt–Jacob disease in humans, bovine spongiform encephalopathy (BSE) in cattle and scrapie in sheep. TSEs are characterized by the formation and accumulation of transmissible (infectious) disease-associated protease-resistant prion protein (PrPSc), mainly in tissues of the central nervous system. The exact molecular processes behind the conversion of PrPC into PrPSc are not clearly understood. Correlations between prion protein polymorphisms and disease have been found, however in what way these polymorphisms influence the conversion processes remains an enigma; is stabilization or destabilization of the prion protein the basis for a higher conversion propensity? Apart from the disease-associated polymorphisms of the prion protein, the molecular processes underlying conversion are not understood. There are some notions as to which regions of the prion protein are involved in refolding of PrPC into PrPSc and where the most drastic structural changes take place. Direct interactions between PrPC molecules and/or PrPSc are likely at the basis of conversion, however which specific amino acid domains are involved and to what extent these domains contribute to conversion resistance/sensitivity of the prion protein or the species barrier is still unknown.  相似文献   
1000.
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号