全文获取类型
| 收费全文 | 300篇 |
| 免费 | 21篇 |
专业分类
| 林业 | 4篇 |
| 农学 | 5篇 |
| 基础科学 | 4篇 |
| 44篇 | |
| 综合类 | 80篇 |
| 农作物 | 7篇 |
| 水产渔业 | 5篇 |
| 畜牧兽医 | 153篇 |
| 园艺 | 7篇 |
| 植物保护 | 12篇 |
出版年
| 2020年 | 3篇 |
| 2019年 | 8篇 |
| 2018年 | 3篇 |
| 2017年 | 4篇 |
| 2016年 | 7篇 |
| 2015年 | 4篇 |
| 2014年 | 5篇 |
| 2013年 | 8篇 |
| 2012年 | 10篇 |
| 2011年 | 16篇 |
| 2010年 | 13篇 |
| 2009年 | 5篇 |
| 2008年 | 10篇 |
| 2007年 | 11篇 |
| 2006年 | 10篇 |
| 2005年 | 5篇 |
| 2004年 | 6篇 |
| 2003年 | 6篇 |
| 2002年 | 9篇 |
| 2001年 | 4篇 |
| 2000年 | 9篇 |
| 1999年 | 2篇 |
| 1998年 | 6篇 |
| 1997年 | 5篇 |
| 1995年 | 3篇 |
| 1994年 | 3篇 |
| 1992年 | 12篇 |
| 1991年 | 10篇 |
| 1990年 | 6篇 |
| 1988年 | 8篇 |
| 1987年 | 4篇 |
| 1986年 | 4篇 |
| 1985年 | 2篇 |
| 1984年 | 2篇 |
| 1983年 | 3篇 |
| 1982年 | 4篇 |
| 1978年 | 11篇 |
| 1974年 | 4篇 |
| 1973年 | 3篇 |
| 1972年 | 2篇 |
| 1971年 | 6篇 |
| 1970年 | 3篇 |
| 1969年 | 5篇 |
| 1966年 | 6篇 |
| 1964年 | 4篇 |
| 1963年 | 4篇 |
| 1944年 | 2篇 |
| 1943年 | 2篇 |
| 1939年 | 2篇 |
| 1935年 | 6篇 |
排序方式： 共有321条查询结果，搜索用时 234 毫秒
21.
22.
23.
24.
25.
Countercurrent chromatography: liquid-liquid partition chromatography without solid support 总被引：3，自引：0，他引：3
The liquid-liquid partition chromatographic system reported here involves a long helix of narrow-bore tubing. When the coiled tube is filled with one phase of a two-phase system and fed with the other phase, phase-interchange takes place in each turn of the coil, leaving a segment of the former phase as the stationary phase. Consequently, solutes present in either phase are subjected to a multistep partition process. The column efficiency, estimated on a separation of dinitrophenyl amino acids, is comparable to that of gas chromatography. 相似文献
26.
A premature lamb fetus was totally sustained by extracorporeal perfusion with the use of a silicone-membrane blood oxygenator and parenteral nutritional support. The fetus remained in a metabolically stable state lasting several days. 相似文献
27.
We have developed a new method of countercurrent chromatography which employs a vertical helical tube in the centrifugal field. The helical tube is arranged so that it does not rotate as it revolves, thus eliminating the need for rotating seals. When the gyrating tube is filled with either phase and the other phase is introduced into the tube in the proper direction, an equilibrium state results in which the two phases are split into multiple alternating segments within the coil. Each phase oscillates to and fro with the rotation as the moving phase is steadily eluted out through the other end of the tube. Consequently, solutes introduced into the tube are subjected to a rapid partition process, resulting in an efficient chromatographic separation without the complications arising from solid supports. The method is illustrated by the microanalytical separation of dinitrophenyl amino acids and can be used on a preparative scale. 相似文献
28.
29.
Bowman I 《Science (New York, N.Y.)》1946,103(2672):319-323
30.