全文获取类型
收费全文 | 9164篇 |
免费 | 670篇 |
国内免费 | 3篇 |
专业分类
林业 | 823篇 |
农学 | 358篇 |
基础科学 | 57篇 |
2503篇 | |
综合类 | 239篇 |
农作物 | 445篇 |
水产渔业 | 940篇 |
畜牧兽医 | 3528篇 |
园艺 | 134篇 |
植物保护 | 810篇 |
出版年
2024年 | 17篇 |
2023年 | 76篇 |
2022年 | 111篇 |
2021年 | 227篇 |
2020年 | 209篇 |
2019年 | 140篇 |
2018年 | 463篇 |
2017年 | 462篇 |
2016年 | 459篇 |
2015年 | 359篇 |
2014年 | 403篇 |
2013年 | 604篇 |
2012年 | 720篇 |
2011年 | 633篇 |
2010年 | 374篇 |
2009年 | 289篇 |
2008年 | 520篇 |
2007年 | 530篇 |
2006年 | 422篇 |
2005年 | 425篇 |
2004年 | 364篇 |
2003年 | 320篇 |
2002年 | 262篇 |
2001年 | 198篇 |
2000年 | 201篇 |
1999年 | 171篇 |
1998年 | 29篇 |
1997年 | 36篇 |
1996年 | 30篇 |
1995年 | 17篇 |
1993年 | 18篇 |
1992年 | 55篇 |
1991年 | 40篇 |
1990年 | 40篇 |
1989年 | 46篇 |
1988年 | 36篇 |
1987年 | 39篇 |
1986年 | 45篇 |
1985年 | 47篇 |
1984年 | 35篇 |
1983年 | 34篇 |
1982年 | 18篇 |
1981年 | 14篇 |
1979年 | 31篇 |
1978年 | 30篇 |
1977年 | 27篇 |
1974年 | 26篇 |
1973年 | 45篇 |
1972年 | 30篇 |
1971年 | 25篇 |
排序方式: 共有9837条查询结果,搜索用时 15 毫秒
241.
In 15 selected stocks in the Strakonice district, 507 slaughter pigs, 708 small terrestric mammals and 110 free-living birds were examined in a two-year period (1986-1987) to study the occurrence of carriers of yersiniae and their elimination. Rectal smears from 243 persons working in livestock production were examined in the same way. Standard bacteriological methods, recent examination procedures (Aulisio et al., 1980; Aldová, 1981) and a diagnostic antiserum (03 IMUNA Sarisské Michalany) were used for the examination. The following results were obtained: In pigs: 1. yersiniae were detected in 65 cases (12.8%); of this, in 31 cases they occurred in the tonsils, in 35 cases in ileum, and twice in the ileocaecal lymph nodes. 2. Epidemiologically significant Y. enterocolitica 4;03 was detected in 28 cases (5.5%); of this, 22 times in the tonsils, 7 times in ileum, and once in the ileocaecal lymph nodes. 3. The seasonal nature of the occurrence of yersiniae was confirmed in 1986, with maxima in winter-spring, but in 1987 their occurrence declined substantially to less than a quarter. In the small mammals, yersiniae were detected 28 times (4%); of this, 7 times in common field mouse, 11 times in common vole, 5 times in house mouse, twice in shrew, once in Apodemus flavicollis, and once in Apodemus sp. 2. Y. enterocolitica 4;03 was detected twice (0.26%), both cases in the house mouse. Other results: 1. In all the 110 free-living birds the examination for yersiniae had a negative result; 2. in the rectal smears of 243 persons employed in livestock production, yersiniae were identified twice (0.8%)--in one case Y. enterocolitica 1, in the other Y. enterocolitica biovars 1 and 2. 相似文献
242.
Objective To compare different methods for assessing the compliance of veterinary clients administering medication to their dogs.
Procedure Thirty-one owners whose dogs were prescribed amoxycillin-clavulanate, twice and thrice daily, for a duration of five to seven days were recruited from three Sydney veterinary hospitals. Compliance was assessed by electronic monitoring devices, return medication counts, client self-reports and veterinarians' estimation of likely compliance.
Results Electronic monitoring showed owners administered on average 84% (range 7 to 104%) of prescribed medication to their dogs. Both return medication counts and client self-reports tended to overestimate therapeutic compliance when compared with electronic monitoring. When questioned, the majority of owners (71%) claimed perfect compliance with the prescribed regimen. No correlation was found between veterinarians' estimates of owner compliance and that assessed electronically.
Conclusion Electronic monitoring provided valuable information on dose timing and variation, but proved costly and difficult to employ in veterinary practice. Simplicity and low cost of return medication counts makes this method attractive for use in veterinary compliance studies. Client self-reports reliably detected some noncompliers and permitted identification of individual problems or errors. For practical purposes a combination of return medication counts and client self-reports may have merit in future veterinary compliance studies. 相似文献
Procedure Thirty-one owners whose dogs were prescribed amoxycillin-clavulanate, twice and thrice daily, for a duration of five to seven days were recruited from three Sydney veterinary hospitals. Compliance was assessed by electronic monitoring devices, return medication counts, client self-reports and veterinarians' estimation of likely compliance.
Results Electronic monitoring showed owners administered on average 84% (range 7 to 104%) of prescribed medication to their dogs. Both return medication counts and client self-reports tended to overestimate therapeutic compliance when compared with electronic monitoring. When questioned, the majority of owners (71%) claimed perfect compliance with the prescribed regimen. No correlation was found between veterinarians' estimates of owner compliance and that assessed electronically.
Conclusion Electronic monitoring provided valuable information on dose timing and variation, but proved costly and difficult to employ in veterinary practice. Simplicity and low cost of return medication counts makes this method attractive for use in veterinary compliance studies. Client self-reports reliably detected some noncompliers and permitted identification of individual problems or errors. For practical purposes a combination of return medication counts and client self-reports may have merit in future veterinary compliance studies. 相似文献
243.
244.
245.
246.
247.
248.
249.
250.