全文获取类型
收费全文 | 89篇 |
免费 | 0篇 |
专业分类
系统科学 | 3篇 |
现状及发展 | 20篇 |
研究方法 | 6篇 |
综合类 | 59篇 |
自然研究 | 1篇 |
出版年
2015年 | 1篇 |
2013年 | 1篇 |
2012年 | 4篇 |
2011年 | 4篇 |
2007年 | 6篇 |
2006年 | 3篇 |
2005年 | 7篇 |
2004年 | 4篇 |
2003年 | 3篇 |
2002年 | 7篇 |
2001年 | 2篇 |
2000年 | 2篇 |
1997年 | 2篇 |
1996年 | 1篇 |
1990年 | 3篇 |
1989年 | 2篇 |
1988年 | 1篇 |
1987年 | 1篇 |
1986年 | 2篇 |
1985年 | 5篇 |
1984年 | 2篇 |
1983年 | 1篇 |
1980年 | 1篇 |
1979年 | 4篇 |
1978年 | 2篇 |
1977年 | 2篇 |
1975年 | 1篇 |
1974年 | 2篇 |
1973年 | 2篇 |
1972年 | 1篇 |
1971年 | 1篇 |
1970年 | 1篇 |
1969年 | 3篇 |
1967年 | 3篇 |
1966年 | 2篇 |
排序方式: 共有89条查询结果,搜索用时 390 毫秒
71.
P. Singer M. Wirth W. Gödicke H. Heine 《Cellular and molecular life sciences : CMLS》1985,41(4):462-464
Summary A mackerel diet or a herring diet in which two cans of fish fillet were consumed daily over 2 weeks within a prescribed regimen, in a crossover design, were given to 15 normotensive volunteers, 14 patients with mild essential hypertension and eight patients with type IV and V hyperlipoproteinemia (HLP). In normotensives a markedly lower systolic and diastolic blood pressure at the end of the period on the mackerel diet could be observed, whereas in hypertensive and hyperlipemic subjects only systolic blood pressure was significantly decreased. After the herring diet, which served as control, changes in blood pressure were of a minor degree. 相似文献
72.
73.
Web-based training is growing quickly in popularit y for professionals in industrial organizations and large enterprises. The savings in cost and time are significant. The instructor-led trainings are bounded by time and place, not to mention the cost involved in traveling, accommodation and training venue. However, in the most online training courses, all trainees are given same training materials and teaching paradigms. The problem of differentia ting the trainees‘ abilities is the main concern. We n... 相似文献
74.
75.
76.
Summary Peripherally self-injected acetaldehyde in interaction with environmental and nutritional variables significantly enhances alcohol drinking in rats and suggests an involvement of acetaldehyde in voluntary alcohol intake. 相似文献
77.
78.
Resumen Un agregado de proteínas solubilizadas en Triton X-100 fue resuelto como una banda por electroforesis a un pH de 8.5. En un pH de 7.1 estas fracciones no demuestran el efecto de agregación. Solamente electroforesis conTris/glicina como amortiguador y concentraciones del detergente menor de 0.6% dieron resultados. 相似文献
79.
Taste sensation and food selection by animals can change adaptively in response to experience, for example to redress specific nutrient deficiencies. We show here, in two species of caterpillar, that infection by lethal parasites alters the taste of specific phytochemicals for the larvae. Given that these compounds are toxic to the parasites and are found in plants eaten by the caterpillars, their changed taste may encourage parasitized caterpillars to increase consumption of plants that provide a biochemical defence against the invaders. 相似文献
80.