全文获取类型
收费全文 | 96篇 |
免费 | 21篇 |
专业分类
林业 | 2篇 |
1篇 | |
综合类 | 53篇 |
水产渔业 | 4篇 |
畜牧兽医 | 55篇 |
植物保护 | 2篇 |
出版年
2019年 | 3篇 |
2018年 | 2篇 |
2017年 | 3篇 |
2016年 | 5篇 |
2015年 | 2篇 |
2014年 | 4篇 |
2013年 | 2篇 |
2012年 | 2篇 |
2010年 | 3篇 |
2009年 | 5篇 |
2007年 | 3篇 |
1998年 | 2篇 |
1988年 | 2篇 |
1987年 | 2篇 |
1977年 | 2篇 |
1976年 | 2篇 |
1972年 | 4篇 |
1970年 | 1篇 |
1969年 | 1篇 |
1968年 | 1篇 |
1965年 | 1篇 |
1954年 | 1篇 |
1942年 | 1篇 |
1939年 | 1篇 |
1938年 | 2篇 |
1937年 | 1篇 |
1936年 | 4篇 |
1935年 | 1篇 |
1934年 | 1篇 |
1931年 | 2篇 |
1929年 | 1篇 |
1928年 | 1篇 |
1927年 | 2篇 |
1925年 | 1篇 |
1924年 | 2篇 |
1922年 | 1篇 |
1920年 | 1篇 |
1919年 | 4篇 |
1918年 | 2篇 |
1917年 | 1篇 |
1916年 | 2篇 |
1915年 | 1篇 |
1914年 | 2篇 |
1913年 | 3篇 |
1912年 | 3篇 |
1909年 | 2篇 |
1908年 | 2篇 |
1907年 | 2篇 |
1906年 | 1篇 |
1905年 | 1篇 |
排序方式: 共有117条查询结果,搜索用时 15 毫秒
51.
Nasal lesions in rats exposed to hydrogen sulfide for four hours 总被引:3,自引:0,他引:3
A Lopez M Prior S Yong L Lillie M Lefebvre 《American journal of veterinary research》1988,49(7):1107-1111
Fischer-344 rats were exposed for 4 hours to 0, 14, 280, or 560 mg of hydrogen sulfide.m-3 and killed 1, 18, or 44 hours later. We evaluated the nasal epithelial cells and determined the anatomic distribution of lesions. Inhalation of 560 mg of hydrogen sulfide.m-3 induced necrosis and exfoliation of respiratory and olfactory mucosal cells, but not squamous epithelial cells. The anatomic distribution of lesions was midway along the nasal passages involving nasal and maxillary conchae, but not ethmoidal conchae. Injured respiratory mucosa repaired rapidly, whereas olfactory mucosa continued to exfoliate at 44 hours after exposure. 相似文献
52.
Effect of sex and age on the activities of lactate dehydrogenase and alkaline phosphatase in the lungs of rats. 下载免费PDF全文
A Lopez S Yong A Sharma M Morwood-Clark L E Lillie M Albassam 《Canadian journal of veterinary research》1986,50(3):397-401
Since toxicity studies among different laboratories generally involve rats of different sex and age, this study was conducted to investigate the effect of sex, age and animal to animal variation in the activities of lactate dehydrogenase and alkaline phosphatase from bronchoalveolar lavage fluid, bronchoalveolar cell lysate and lung homogenate. Correlation between numbers of bronchoalveolar cells recovered from lungs and enzyme activity in bronchoalveolar cell lysate or lung homogenate supernatant were also investigated. Male rats showed significantly (p less than 0.05) higher activities of alkaline phosphatase in the bronchoalveolar lavage fluid and lung homogenate. Animal to animal variation for lactate dehydrogenase and alkaline phosphatase was higher in lungs than in serum. The number of bronchoalveolar cells recovered from lungs revealed a significant (p less than 0.01) positive correlation with the activities of both enzymes in the supernatant of cell lysates but not in the bronchoalveolar fluid. These results indicated that in an inhalation study interindividual variation in the levels of pulmonary enzymes should be considered in order to minimize the numerous possible sources of experimental error. 相似文献
53.
54.
55.
56.
57.
58.
59.
60.