全文获取类型
收费全文 | 67篇 |
免费 | 50篇 |
专业分类
林业 | 8篇 |
农学 | 2篇 |
基础科学 | 1篇 |
1篇 | |
综合类 | 6篇 |
农作物 | 3篇 |
水产渔业 | 4篇 |
畜牧兽医 | 85篇 |
植物保护 | 7篇 |
出版年
2020年 | 2篇 |
2015年 | 2篇 |
2013年 | 2篇 |
2010年 | 1篇 |
2009年 | 1篇 |
2007年 | 2篇 |
2004年 | 1篇 |
2003年 | 4篇 |
2002年 | 5篇 |
2001年 | 4篇 |
2000年 | 1篇 |
1999年 | 2篇 |
1998年 | 1篇 |
1995年 | 1篇 |
1994年 | 1篇 |
1992年 | 1篇 |
1987年 | 1篇 |
1986年 | 5篇 |
1985年 | 6篇 |
1984年 | 2篇 |
1982年 | 1篇 |
1981年 | 1篇 |
1980年 | 2篇 |
1979年 | 8篇 |
1978年 | 2篇 |
1977年 | 3篇 |
1976年 | 3篇 |
1975年 | 2篇 |
1974年 | 3篇 |
1973年 | 2篇 |
1972年 | 2篇 |
1971年 | 2篇 |
1970年 | 1篇 |
1969年 | 5篇 |
1968年 | 1篇 |
1967年 | 4篇 |
1966年 | 1篇 |
1965年 | 4篇 |
1963年 | 1篇 |
1962年 | 2篇 |
1961年 | 5篇 |
1958年 | 1篇 |
1957年 | 2篇 |
1956年 | 1篇 |
1955年 | 2篇 |
1954年 | 2篇 |
1951年 | 1篇 |
1949年 | 1篇 |
1947年 | 1篇 |
1943年 | 1篇 |
排序方式: 共有117条查询结果,搜索用时 31 毫秒
1.
2.
Eunice J. Allan Janakie P. Eeswara Shaun Johnson A. Jennifer Mordue E. David Morgan Trevor Stuchbury 《Pest management science》1994,42(3):147-152
Callus produced from leaves of a Ghanaian strain of the neem tree, Azadirachta indica A. Juss has been shown to produce the natural insecticide azadirachtin when grown in a defined medium. The azadirachtin was isolated by standard procedures of solvent partition and column chromatography monitored by supercritical fluid chromatography. Biological activity was monitored with antifeedant tests using the desert locust (Schistocerca gregaria Forsk.). The azadirachtin was identified by chromatography on three independent chromatographic systems (SFC, HPLC & TLC) and two thin-layer colour tests. It has 100% antifeedant activity at < 0.04mg litre?1. The yield of azadirachtin was 0.0007% based on dry weight of callus. 相似文献
3.
Hog Cholera: IV. Detection of the Virus in Tissue Culture Preparations by the Fluorescent Antibody Technique 总被引:3,自引:1,他引:2
下载免费PDF全文
![点击此处可从《Canadian journal of veterinary research》网站下载免费的PDF全文](/ch/ext_images/free.gif)
A. Robertson A. S. Greig M. Appel A. Girard G. L. Bannister P. Boulanger 《Canadian journal of veterinary research》1965,29(9):234-241
The fluorescent-antibody technique was employed for detection of hog cholera virus in tissue cultures inoculated with spleens of infected animals. As controls, cultures were also inoculated with material from normal swine and from those infected with other agents. In the first series 71 of 73 infected spleens, or 97 per cent, were detected. There were no false positive reactions among the controls. Results obtained with the second series of pigs showed that spleens collected during advanced stages of the disease were more satisfactory specimens than those collected earlier during the high temperature phase of infection. Findings with the third series of older swine indicated that their spleens were less satisfactory as a source of virus than those from young pigs. Tissues from freshly killed animals provided better specimen material than those from animals which had died. 相似文献
4.
5.
Smith-Palmer A Stewart WC Mather H Greig A Cowden JM Reilly WJ 《The Veterinary record》2003,153(17):517-520
Two serovars of salmonella which are currently of particular importance in both human and animal infections are Salmonella enterica serovars Enteritidis phage type 4 (PT4) and Typhimurium definitive type 104 (DT104). This paper describes the trends in the relationships between the levels of infection of people and a range of farm animal species with these two serovars and explores some of the reasons behind them. In 1996, there was a peak of 520 reports of S Typhimurium DT104 infection in people in Scotland, but the number has decreased every year since, to 96 in 2001. In cattle the incidence of S Typhimurium DT104 also peaked in 1996, with 138 incidents, and it has similarly decreased every year to 2001 when there were 10 reported incidents. Similar declines have been observed in its incidence in sheep and pigs. In people the number of reports of S Enteritidis PT4 peaked in 1997 at 1684 and then declined to 457 in 2001. In chickens, the number of reports of S Enteritidis PT4 peaked in 1998 at 34 incidents, but no incidents were reported in the following three years. 相似文献
6.
7.
The effects of long acting oxytetracycline in controlling outbreaks of enzootic abortion of ewes were studied over three consecutive years in 13 different commercial flocks. When used in the face of an outbreak the compound produced a statistically significant reduction in abortion in treated ewes when compared to untreated controls. There was, however, only a marginal difference in the overall abortion rate between treated and untreated groups of ewes in known infected flocks, where the drug was used in anticipation of an abortion storm, mainly because the abortion rate was too low in the control group. It is suggested that oxytetracycline therapy should only be used in an effort to control an actual abortion outbreak on the understanding that the treatment will not eradicate infection from the flock. 相似文献
8.
Greig ME 《Science (New York, N.Y.)》1947,105(2739):665-666
9.
The longevity of Fomes annosus in conifer stumps was assessed in 3 investigations, which showed that the fungus could remain active in stumps for periods of 16 to 62 years. 相似文献
10.