全文获取类型
收费全文 | 257篇 |
免费 | 1篇 |
国内免费 | 1篇 |
专业分类
系统科学 | 2篇 |
理论与方法论 | 1篇 |
现状及发展 | 204篇 |
研究方法 | 4篇 |
综合类 | 46篇 |
自然研究 | 2篇 |
出版年
2013年 | 2篇 |
2012年 | 2篇 |
2011年 | 6篇 |
2009年 | 3篇 |
2007年 | 2篇 |
2006年 | 5篇 |
2004年 | 4篇 |
2003年 | 11篇 |
2002年 | 6篇 |
2001年 | 2篇 |
2000年 | 2篇 |
1991年 | 2篇 |
1990年 | 4篇 |
1989年 | 5篇 |
1988年 | 5篇 |
1986年 | 3篇 |
1985年 | 4篇 |
1984年 | 2篇 |
1982年 | 2篇 |
1981年 | 4篇 |
1980年 | 2篇 |
1979年 | 12篇 |
1978年 | 3篇 |
1977年 | 12篇 |
1976年 | 5篇 |
1975年 | 5篇 |
1974年 | 5篇 |
1973年 | 5篇 |
1972年 | 5篇 |
1971年 | 11篇 |
1970年 | 9篇 |
1969年 | 9篇 |
1968年 | 9篇 |
1967年 | 11篇 |
1966年 | 8篇 |
1965年 | 5篇 |
1964年 | 2篇 |
1963年 | 4篇 |
1961年 | 7篇 |
1960年 | 3篇 |
1959年 | 5篇 |
1958年 | 4篇 |
1957年 | 3篇 |
1956年 | 2篇 |
1955年 | 2篇 |
1954年 | 4篇 |
1948年 | 2篇 |
1947年 | 7篇 |
1946年 | 6篇 |
1945年 | 4篇 |
排序方式: 共有259条查询结果,搜索用时 15 毫秒
101.
Summary Furasterin, 4-chloro-7-hydroxy-5-methoxy-2-methyl-benzofuran, a new naturally occurring mono-chlorinated fungal metabolite was isolated fromPhialophora Asteris (Downson) Burge et Isaac. Its possible relationship with the biosynthetical pathway of the fungitoxic dichlorinated fungal metabolite cryptosporiopsin is discussed.This work was supported by a combined grant from the French C. N. R. S. and the Dutch foundation Z. W. O. 相似文献
102.
103.
Summary The octapeptide Val5-Angiotensin II-Asp1--amide is split into characteristic fragments by hydrogen peroxide, when complexed with Ni2+; this degradation does not occur with the Cu2+ complex, presumably because an active ternary peroxo complex cannot be formed. 相似文献
104.
Ch. Pilgrim 《Cellular and molecular life sciences : CMLS》1967,23(11):943-943
Summary In hypothalamic neurosecretory nuclei of rats subject to water withdrawl for 1–14 days, a marked increase in the activities of histochemically detected acid phosphatase, thiamine pyrophosphatase and glucose-6-phosphate dehydrogenase is observed. LDH and SDH activities do not change. Two different cell types can be distinguished by means of the acid phosphatase and TPPase reactions. 相似文献
105.
106.
107.
Effects of cadmium on the immune system of mice 总被引:1,自引:0,他引:1
S. Müller K. -E. Gillert Ch. Krause G. Jautzke U. Gross T. Diamantstein 《Cellular and molecular life sciences : CMLS》1979,35(7):909-910
Summary Chronic oral exposure of mice to Cd++ inhibits cell-mediated immunity of delayed type hypersensitivity induced by sheep red blood cells (SRBC). No effect was detected on humoral immune response to SRBC. Spleen cells derived from mice exposed to Cd++ showed in vitro enhanced response to T and B cell mitogens. These results demonstrate that Cd++ exposure alters the immune system of mice.Dedicated to Prof. Georg Henneberg on the occasion of his 70th anniversary on 12.10.1978.Acknowledgments. Supported by a grant from the Umweltbundesamt. We thank Ms Odenwald, Ms Schulz, Klinikum Steglitz, and Ms Emeis, Robert Koch-Institut Abt. Immunologie, for the excellent technical assistance. 相似文献
108.
Meystre Ch. Heusler K. Kalvoda J. Wieland P. Anner G. Wettstein A. 《Cellular and molecular life sciences : CMLS》1961,17(10):475-480
Summary The intramolecular substitution of the angular methyl groups in steroids by attack of O-radicals derived from 6-, 11, and 20-alcohols is discussed. Irrespective of their genesis, these radicals abstract a hydrogen atom from one of the said methyl groups, suitably oriented in-position. The C-radicals thus formed give different products depending on the neighbouring groups.It is shown that 20-hydroxy-18-C-radicals combine with iodine atoms, to give 18-iodides which can befurther substituted through radicals to give potential 18-oxo-compounds in high yield. In the case of 20-cyanohydrines, the intramolecular reaction of the 18-C-radical with the cyano groups gives rise to the new 18-cyano-20-oxo-steroids.With 6- and 11-O-radicalssingle substitution in 19-position predominates, since the steric arrangement of the primary product favours the intramolecular ether formation over a second substitution reaction.A general reaction scheme for these transformations is proposed.
Vorgetragen vonCh. Meystre am 23. 9. 61 anlässlich der Sommerversammlung der Schweiz. Chem. Gesellschaft in Biel (vgl. Chimia15, (1961), im Druck).
Über Steroide 180. Mitteilung. 179. Mitt. vgl.A. Wettstein, Exper.17, 329 (1961). 相似文献
Vorgetragen vonCh. Meystre am 23. 9. 61 anlässlich der Sommerversammlung der Schweiz. Chem. Gesellschaft in Biel (vgl. Chimia15, (1961), im Druck).
Über Steroide 180. Mitteilung. 179. Mitt. vgl.A. Wettstein, Exper.17, 329 (1961). 相似文献
109.
J. Cambar F. Lemoigne Ch. Toussaint 《Cellular and molecular life sciences : CMLS》1979,35(12):1607-1609
Summary Parallel variations in plasma and urine variations of endogenous urea and creatinine level in the rat during 4 consecutive 6-h-long periods permit to evidence urea and creatinine clearance diurnal variations with very significant increase in the 2 nightly periods. The signification of this very large nightly glomerular filtration increase is discussed. 相似文献
110.
L. Edvinsson K. C. Nielsen Ch. Owman 《Cellular and molecular life sciences : CMLS》1973,29(4):432-433
Zusammenfassung Mittels I131 markiertem Human-Serumalbumin wurde das Blutvolumen im Gehirn von Mäusen zu verschiedenen Tageszeiten gemessen und eine circadiane Rhythmik festgestellt. Andauernder Dunkelaufenthalt führt zu erhöhten Werten des Blutvolumens. 相似文献