全文获取类型
收费全文 | 1158篇 |
免费 | 0篇 |
专业分类
化学工业 | 2篇 |
金属工艺 | 1篇 |
矿业工程 | 4篇 |
轻工业 | 1篇 |
无线电 | 1篇 |
一般工业技术 | 7篇 |
冶金工业 | 1141篇 |
自动化技术 | 1篇 |
出版年
2019年 | 1篇 |
2013年 | 2篇 |
2007年 | 1篇 |
2006年 | 1篇 |
2003年 | 2篇 |
1999年 | 5篇 |
1998年 | 272篇 |
1997年 | 203篇 |
1996年 | 161篇 |
1995年 | 85篇 |
1994年 | 73篇 |
1993年 | 59篇 |
1992年 | 13篇 |
1991年 | 13篇 |
1990年 | 1篇 |
1989年 | 9篇 |
1988年 | 7篇 |
1987年 | 3篇 |
1986年 | 4篇 |
1985年 | 3篇 |
1984年 | 2篇 |
1983年 | 2篇 |
1982年 | 7篇 |
1981年 | 10篇 |
1980年 | 18篇 |
1979年 | 1篇 |
1978年 | 3篇 |
1977年 | 70篇 |
1976年 | 122篇 |
1975年 | 3篇 |
1955年 | 2篇 |
排序方式: 共有1158条查询结果,搜索用时 15 毫秒
41.
42.
In order to validate a rodent biochemical model of delayed neurotoxicity of organophosphates (OP) inhibition of rat and hen brain neurotoxic esterase (NTE) by some dichlorovinyl phosphates and phosphonates was studied in vitro and in vivo. It was shown that compounds investigated exhibited the similar inhibitory potency to NTE from both species in vitro, in addition rat and hen NTE showed the same sensitivity to variation of the structure of OP inhibitors. A good correlation was found between pI50 estimated with enzymes from rat and hen trains: r2 = 0.951, n = 18, p < or = 0.05. NTE activities were also measured in rat and hen brains after acute administration of various dosages of potent axonopathic compound dipropyldichlorovinyl phosphate. The results obtained indicate that difference in species susceptibility to neurotoxic action of OP, in particular the absence of ataxia in rats, is not caused by difference in target enzyme sensitivity to axonopathic organophosphates. 相似文献
43.
44.
45.
46.
47.
48.
49.
VV Portugalov EA Savina AS Kaplanski? VI Iakovleva GI Plakhuta-Plakutina 《Canadian Metallurgical Quarterly》1976,10(4):19-25
A morphological examination of 27 rats flown onboard the biosatellite and sacrificed on the 1st-2nd and 26-27th postflight days demonstrated no significant changes in the structural organization of the vital organs and systems of the animal body. It was, however, found that the space exposure induced morphologically detectable changes in the musculo-skeletal system, hemo- and lymphopoiesis, hypothalamic-pituitary-adrenal system and the juxtaglomerular apparatus of the kidneys. The changes were reversible and nonspecific, and could be seen in animals exposed to ground-based hypokinetic and other stress experiments. Postflight the animals developed some reactions that were similar to those in humans. This helps to identify the morphological substrate of certain changes in the human body and to investigate their pathogenesis. 相似文献
50.
The macrophage adherence inhibition was studied in the peritoneal macrophages of guinea pigs with induced posttraumatic aspermatogenesis at various periods after the testis injury. Reliable peritoneal macrophages adherence inhibition was observed in the presence of the testis-specific antigen. The adherence inhibition reflected the autoimmune character of the testis affection. 相似文献