全文获取类型
收费全文 | 146488篇 |
免费 | 14194篇 |
国内免费 | 8668篇 |
专业分类
耳鼻咽喉 | 1107篇 |
儿科学 | 1849篇 |
妇产科学 | 1624篇 |
基础医学 | 21832篇 |
口腔科学 | 2551篇 |
临床医学 | 17610篇 |
内科学 | 20443篇 |
皮肤病学 | 1598篇 |
神经病学 | 7249篇 |
特种医学 | 5025篇 |
外国民族医学 | 66篇 |
外科学 | 13974篇 |
综合类 | 23974篇 |
现状与发展 | 30篇 |
一般理论 | 12篇 |
预防医学 | 10251篇 |
眼科学 | 3576篇 |
药学 | 16857篇 |
125篇 | |
中国医学 | 8038篇 |
肿瘤学 | 11559篇 |
出版年
2024年 | 575篇 |
2023年 | 2277篇 |
2022年 | 5853篇 |
2021年 | 7382篇 |
2020年 | 5416篇 |
2019年 | 4826篇 |
2018年 | 5052篇 |
2017年 | 4653篇 |
2016年 | 4436篇 |
2015年 | 6461篇 |
2014年 | 7980篇 |
2013年 | 7730篇 |
2012年 | 10845篇 |
2011年 | 11497篇 |
2010年 | 8080篇 |
2009年 | 6500篇 |
2008年 | 7816篇 |
2007年 | 7816篇 |
2006年 | 7120篇 |
2005年 | 6488篇 |
2004年 | 5026篇 |
2003年 | 4905篇 |
2002年 | 4200篇 |
2001年 | 3502篇 |
2000年 | 3020篇 |
1999年 | 2702篇 |
1998年 | 1712篇 |
1997年 | 1835篇 |
1996年 | 1293篇 |
1995年 | 1229篇 |
1994年 | 1110篇 |
1993年 | 778篇 |
1992年 | 994篇 |
1991年 | 907篇 |
1990年 | 807篇 |
1989年 | 757篇 |
1988年 | 677篇 |
1987年 | 577篇 |
1986年 | 547篇 |
1985年 | 453篇 |
1984年 | 381篇 |
1983年 | 313篇 |
1982年 | 272篇 |
1981年 | 233篇 |
1980年 | 196篇 |
1979年 | 202篇 |
1978年 | 194篇 |
1977年 | 211篇 |
1976年 | 191篇 |
1974年 | 156篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
101.
102.
The toxic effects of nitroquine-dapsone compound(NQD)in mice and dogs were studied.The therapeutic index of NQDin mice is 1911,the greatest among the 6 antimalarials tested.Thetoxic effects of NQD(50 mg/kg/day for 3 days per os)and nitro-quine in dogs were manifested by injuries on the adrenal cortexand intestinal epithelium.When folic acid(4 mg/kg/day for 4 days)or calcium leucovorinum(0.3 mg/kg/day for 4 days)were usedconcomitantly with NQD,the death rate and the incidence of dia-rrhea in the toxicated dogs were greatly reduced,the injury on theintestinal epithelium was much milder,and the goblet cells weremuch more numerous than those without treatment.The results suggestthat folic acid and calcium leucovorinum can protect the undifferen-tiated cells in the intestinal crypts from being injured by NQD. 相似文献
103.
104.
V. E. Kataev O. I. Militsina I. Yu. Strobykina G. I. Kovylyaeva R. Z. Musin O. V. Fedorova G. L. Rusinov M. N. Zueva G. G. Mordovskoi A. G. Tolstikov 《Pharmaceutical Chemistry Journal》2006,40(9):473-475
Diesters based on isosteviol and dicarboxylic acids were synthesized and tested for antituberculous activity. Isosteviol and
some of its derivatives exhibit appreciable tuberculostatic properties in vitro, the activity being dependent on the length of the polymethylene spacer connecting two ent-beyeran fragments. The mechanism of the antituberculous action of isosteviol derivatives are discussed.
__________
Translated from Khimiko-Farmatsevticheskii Zhurnal, Vol. 40, No. 9, pp. 12–13, September, 2006. 相似文献
105.
106.
107.
108.
Rapid growth in biomedical research coupled with dramatic advancement in biotechnology has significantly improved our understanding of the molecular basis involving cancer development and progression. This improvement has led to the discovery of new molecular markers for cancer diagnosis and prognosis as well as new molecular targets for cancer treatment and intervention. Continuous emergence of some new developing area in molecular profiling, new therapeutic agents, tissue microenvironment and systems biology have made significant progress in clinical oncology. Clinical research and investigation that focus on these new developments have begun to show exciting results that indicate future promises in improving patient management and survival. 相似文献
109.
The influence of chronic administration of a dry cleared extract of Glycyrrhiza glabra (DCEG) containing flavonoids on the behavioral status and learning of intact and ovariectomized adult female rats has been
studied. The DCEG preparation was administered in low (0.5 mg/kg, i.p.) and high (5.0 mg/kg, i.p.) daily doses over a period
of 14 days and the results were evaluated on the passive avoidance situation model and in the open field test. It was established
that the chronic administration of DCEG in both low and high doses produced correction of the passive avoidance performance
in ovariectomized female rats. The administration of DCEG in a low dose also positively influenced the structure of purposeful
behavior of females with deficiency of estrogens.
__________
Translated from Khimiko-Farmatsevticheskii Zhurnal, Vol. 39, No. 8, pp. 27 – 29, August, 2005. 相似文献
110.