全文获取类型
收费全文 | 1313篇 |
免费 | 1篇 |
专业分类
电工技术 | 7篇 |
综合类 | 1篇 |
化学工业 | 8篇 |
机械仪表 | 1篇 |
建筑科学 | 1篇 |
能源动力 | 3篇 |
轻工业 | 4篇 |
水利工程 | 5篇 |
石油天然气 | 2篇 |
无线电 | 17篇 |
一般工业技术 | 19篇 |
冶金工业 | 1228篇 |
原子能技术 | 2篇 |
自动化技术 | 16篇 |
出版年
2018年 | 1篇 |
2017年 | 2篇 |
2016年 | 2篇 |
2015年 | 2篇 |
2014年 | 2篇 |
2013年 | 8篇 |
2012年 | 3篇 |
2011年 | 2篇 |
2010年 | 4篇 |
2009年 | 3篇 |
2008年 | 2篇 |
2007年 | 5篇 |
2006年 | 4篇 |
2005年 | 2篇 |
2004年 | 4篇 |
2003年 | 2篇 |
2002年 | 3篇 |
2001年 | 2篇 |
2000年 | 2篇 |
1999年 | 34篇 |
1998年 | 332篇 |
1997年 | 185篇 |
1996年 | 138篇 |
1995年 | 70篇 |
1994年 | 75篇 |
1993年 | 75篇 |
1992年 | 19篇 |
1991年 | 28篇 |
1990年 | 19篇 |
1989年 | 26篇 |
1988年 | 24篇 |
1987年 | 27篇 |
1986年 | 16篇 |
1985年 | 26篇 |
1984年 | 2篇 |
1983年 | 5篇 |
1982年 | 7篇 |
1981年 | 6篇 |
1980年 | 8篇 |
1978年 | 4篇 |
1977年 | 25篇 |
1976年 | 88篇 |
1975年 | 7篇 |
1973年 | 1篇 |
1972年 | 1篇 |
1971年 | 1篇 |
1968年 | 3篇 |
1966年 | 1篇 |
1964年 | 1篇 |
1955年 | 1篇 |
排序方式: 共有1314条查询结果,搜索用时 0 毫秒
71.
To investigate the effects of a new nonNMDA antagonist on the trisynaptic pathways in the hippocampus, the author examined kainate(KA)-induced generalized seizures in rats. A novel nonNMDA antagonist, YM90K, showed the blockade of the Schaffer collaterals in 2-deoxyglucose study (2-DG) and that the CA1-2 pyramidal cells of the hippocampus were preserved seven days after the KA injections. On the other hand, the control and MK-801 (NMDA-antagonist) treated rats did not depress the Schaffer collaterals and showed persistent hypermetabolism of glucose in the CA1 pyramidal cell layer, where neurons were not preserved seven days later. 2-DG was useful to reveal the effects of nonNMDA antagonist on the KA-induced generalized seizures. This suggests that YM90K is a potent nonNMDA antagonist and that it has a neuroprotective effect in rats. 相似文献
72.
TA Serel G Akhan HR Koyuncuo?lu A Oztürk K Do?ruer S Unal K Celik 《Canadian Metallurgical Quarterly》1997,31(6):537-539
The treatment and favorable outcome of a bitch with uterine torsion and two retained fetuses are described. The condition was corrected surgically by ovariohysterectomy. Complications (i.e., septic shock, peritonitis, and hemostatic abnormalities) were managed with aggressive medical therapy. Torsion of the gravid uterus in dogs is a life-threatening condition which can have a successful outcome if medical complications encountered in the pre- and postoperative periods are treated quickly and effectively. 相似文献
73.
74.
75.
76.
77.
H Heidecke K Eckert K Schulze-Forster HR Maurer 《Canadian Metallurgical Quarterly》1997,19(8):413-420
Immunoregulatory effects of thymic peptides on functions of polymorphonuclear leukocytes (PMNs) are poorly investigated. We studied the effects of prothymosin alpha 1 (Pro alpha 1) on PMNs from patients with colorectal tumors, breast tumors and melanoma (total n = 37) in comparison with healthy donors (n = 18), with respect to chemotaxis, cytotoxicity against HCT-116 colon tumor cells, oxidative response (chemiluminescence reaction) as well as expression of surface marker molecules. We found that Pro alpha 1 was equally effective in stimulating the chemotactic activity of PMNs from tumor patients and healthy donors (43% increase). PMNs from tumor patients, especially with breast tumor, showed a significant enhancement of cytotoxicity against the tumor target cells in comparison with healthy donors. With respect to the PMNs cytotoxicity, only about 50% of the colorectal tumor patients and healthy donors responded to Pro alpha 1 and FMLP. As to the oxidative response of PMNs, elevated levels were found only among colorectal tumor patients. Pro alpha 1 significantly increased the oxidative response in breast and colorectal tumor patients by 55% and 25%, respectively. Pro alpha 1 decreased the expression of CD16 on PMNs of healthy donors, but not that of CD11a, CD11b, CD11c, CD13, CD14, CD15 and CD32. Therefore, we suggest, that Pro alpha 1 may improve some PMN functions of tumor patients, associated with the proposed role in host-tumor interaction. 相似文献
78.
79.
80.