全文获取类型
收费全文 | 77篇 |
免费 | 1篇 |
专业分类
林业 | 2篇 |
农学 | 1篇 |
23篇 | |
综合类 | 19篇 |
水产渔业 | 2篇 |
畜牧兽医 | 20篇 |
园艺 | 6篇 |
植物保护 | 5篇 |
出版年
2021年 | 1篇 |
2020年 | 1篇 |
2019年 | 2篇 |
2014年 | 1篇 |
2013年 | 18篇 |
2012年 | 2篇 |
2011年 | 3篇 |
2009年 | 1篇 |
2008年 | 4篇 |
2007年 | 2篇 |
2006年 | 2篇 |
2005年 | 4篇 |
2004年 | 2篇 |
2003年 | 2篇 |
2002年 | 2篇 |
2000年 | 2篇 |
1999年 | 2篇 |
1998年 | 2篇 |
1994年 | 1篇 |
1990年 | 1篇 |
1989年 | 2篇 |
1986年 | 2篇 |
1982年 | 1篇 |
1981年 | 3篇 |
1977年 | 1篇 |
1974年 | 1篇 |
1973年 | 4篇 |
1972年 | 1篇 |
1970年 | 1篇 |
1969年 | 1篇 |
1967年 | 1篇 |
1963年 | 1篇 |
1960年 | 1篇 |
1952年 | 1篇 |
1947年 | 1篇 |
1881年 | 1篇 |
排序方式: 共有78条查询结果,搜索用时 912 毫秒
1.
2.
W Erhardt C Ring H Kraft A Schmid H M Weinmann R Ebert B Schl?ger M Schindele R Heinze N Lomholt 《DTW. Deutsche tier?rztliche Wochenschrift》1989,96(3):92-99
For investigations of CO2-stunning of feeder- and slaughter-pigs parameters of behaviour, blood-gas-analyses and electroencephalograms were chosen. The following results were obtained: 1. Blood-gas-analyses proved that the CO2-stunning does not produce unconsciousness due to a lack of oxygen. 2. The criterias of general anaesthesia: unconsciousness, muscle-relaxation and analgesia with total reversibility could be confirmed. 3. The violent convulsive symptoms were evaluated as reactions identical with the stage II of GUEDEL's scheme of anaesthesia. 4. Muscular agitation, which sometimes appeared a few seconds before the stage of excitation, was judged to belong either to the start of the excitation phase or to the end of Guedel's stage of analgesia, during which the sensitivity is decreased. Neither study of behavior nor objective measurements showed, during the first 10 to 20 seconds of exposure to the CO2, any sign of pain or suffering related to the Act for Prevention of Cruelty to Animals, and accordingly such suffering should not be ascribed to the CO2 stunning method. 相似文献
3.
4.
5.
Ultrasonography of the femoral artery in the horse, including color, power and spectral Doppler, provides morphologic and dynamic information. This paper describes the use of the techniques in six clinically normal horses and three with femoral artery thrombosis. Useful landmarks for orientation are the saphenous artery and the medial saphenous vein. The lateral circumflex femoral artery can not be visualized. Recognition of the genus descendens artery is complicated due to the presence of multiple distal caudal femoral arteries. The femoral artery feeds a high resistance bed. In normal horses the peak systolic velocity varies between 50–90 cm/sec. Echoic tissue in the femoral artery lumen with stenosis, occlusion and collateral blood flow formation are features encountered in the patients. 相似文献
6.
7.
8.
Ebert TA 《Science (New York, N.Y.)》1967,157(3788):557-558
Purple sea urchins were tagged, measured, and placed in a tidepool at Sunset Bay, Oregon. After 1 year, many animals had decreased in size. Accordingly, size is not necessarily a reliable index of age in Strongylocentrotus purpuratus; however, it is possible to conclude that these animals are relatively long-lived. 相似文献
9.
10.