全文获取类型
收费全文 | 11122篇 |
免费 | 183篇 |
国内免费 | 88篇 |
专业分类
林业 | 480篇 |
农学 | 110篇 |
基础科学 | 38篇 |
1416篇 | |
综合类 | 2824篇 |
农作物 | 376篇 |
水产渔业 | 136篇 |
畜牧兽医 | 5614篇 |
园艺 | 87篇 |
植物保护 | 312篇 |
出版年
2015年 | 22篇 |
2014年 | 37篇 |
2013年 | 24篇 |
2012年 | 926篇 |
2011年 | 1108篇 |
2010年 | 232篇 |
2009年 | 145篇 |
2008年 | 872篇 |
2007年 | 858篇 |
2006年 | 755篇 |
2005年 | 780篇 |
2004年 | 694篇 |
2003年 | 674篇 |
2002年 | 653篇 |
2001年 | 394篇 |
2000年 | 536篇 |
1999年 | 223篇 |
1998年 | 33篇 |
1997年 | 38篇 |
1996年 | 32篇 |
1995年 | 56篇 |
1994年 | 84篇 |
1993年 | 108篇 |
1992年 | 101篇 |
1991年 | 115篇 |
1990年 | 101篇 |
1989年 | 72篇 |
1988年 | 130篇 |
1987年 | 77篇 |
1986年 | 76篇 |
1985年 | 98篇 |
1984年 | 86篇 |
1983年 | 73篇 |
1982年 | 92篇 |
1981年 | 51篇 |
1980年 | 45篇 |
1979年 | 53篇 |
1978年 | 32篇 |
1977年 | 31篇 |
1972年 | 22篇 |
1971年 | 26篇 |
1970年 | 34篇 |
1969年 | 36篇 |
1968年 | 43篇 |
1967年 | 38篇 |
1966年 | 42篇 |
1960年 | 36篇 |
1959年 | 26篇 |
1958年 | 22篇 |
1957年 | 33篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
71.
72.
73.
74.
75.
76.
Nephrotoxicity in dogs associated with methoxyflurane anesthesia and flunixin meglumine analgesia 总被引:2,自引:2,他引:0
下载免费PDF全文
![点击此处可从《The Canadian veterinary journal. La revue veterinaire canadienne》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Mathews KA Doherty T Dyson DH Wilcock B Valliant A 《The Canadian veterinary journal. La revue veterinaire canadienne》1990,31(11):766-771
Uremia unexpectedly developed in five dogs 24 hours after undergoing thoracotomy in a student laboratory. In all dogs general anesthesia had been maintained with methoxyflurane, muscle relaxation had been induced with gallamine, and each dog received a single intravenous dose of 1.0 mg/kg flunixin meglumine for analgesia upon termination of anesthesia. In a subsequent group of dogs undergoing an orthopedic procedure, we assessed the effects on renal function of methoxyflurane anesthesia plus oxymorphone, or of methoxyflurane or halothane anesthesia in combination with a single IM 1.0 mg/kg dose of flunixin meglumine. Significant elevations in serum urea and creatinine values, and necrosis of collecting ducts and loops of Henle, were noted only in the dogs receiving methoxyflurane and flunixin meglumine.
We conclude that the use of combination of methoxyflurane and flunixin meglumine is contraindicated in dogs.
相似文献77.
78.
79.
Summary Seventy-three flocks of fowl were tested at regular intervals for the presence of precipitins to fowl adenovirus (AV) and infectious bronchitis virus (IBV), haem-agglutinating inhibiting antibodies to BC14 virus, and of agglutinins to Mycoplasma gallisepticum (M.g.) and Mycoplasma synoviae (M.s.). In all the eight flocks affected with Egg Drop Syndrome (EDS '76), egg production problems were associated with increasing numbers of BCI4 virus reactors and AV reactors. In flocks showing production problems other than EDS '76 without any apparent cause, the average percentage of AV reactors increased significantly after the rearing period; this was not true of IBV reactors. BC14 reactors were either absent or present only once, in small numbers and with low titres, during the test period. The average percentage of AV reactors did not increase after the rearing period either in normally producing flocks or in flocks with production problems for which other diseases or dietary errors plausibly accounted for these problems. All this suggests a pathogenic role of AV in production problems. One can conclude from the high percentage of reactors in all groups of flocks that sub-clinical IBV infections are common. The percentage of IBV reactors during the laying period of flocks with EDS '76 was significantly higher than that of normally producing flocks. It is therefore suggested that subclinical IBV infection could be among the factors causing stress, acting as a trigger for EDS '76. All M.g.-infected flocks showed production problems; M.s. infections could not be related to egg production disturbances. 相似文献
80.
Silicon monoxide solid was evaporated in a bell jar containing reducing, neutral, or oxidizing atmospheres at pressures of a few torr. The vapor invariably condensed as smoke-sized particles of silicon sesquioxide, Si(2)O(3). The condensation of a solid whose composition differs from that of the parent gas and is apparently the least stable of the three solid species illustrates the importance of specific nucleation effects in the condensation process. This result has significant implications for theories of formation of grains in space. 相似文献