全文获取类型
收费全文 | 1727276篇 |
免费 | 125169篇 |
国内免费 | 3952篇 |
专业分类
耳鼻咽喉 | 22333篇 |
儿科学 | 56220篇 |
妇产科学 | 46714篇 |
基础医学 | 245535篇 |
口腔科学 | 49698篇 |
临床医学 | 153520篇 |
内科学 | 341038篇 |
皮肤病学 | 39067篇 |
神经病学 | 133858篇 |
特种医学 | 64905篇 |
外国民族医学 | 242篇 |
外科学 | 262514篇 |
综合类 | 39097篇 |
现状与发展 | 4篇 |
一般理论 | 533篇 |
预防医学 | 125365篇 |
眼科学 | 40693篇 |
药学 | 126264篇 |
7篇 | |
中国医学 | 4541篇 |
肿瘤学 | 104249篇 |
出版年
2021年 | 13464篇 |
2019年 | 13982篇 |
2018年 | 20495篇 |
2017年 | 15641篇 |
2016年 | 17134篇 |
2015年 | 19510篇 |
2014年 | 26942篇 |
2013年 | 38904篇 |
2012年 | 54258篇 |
2011年 | 57063篇 |
2010年 | 33739篇 |
2009年 | 31497篇 |
2008年 | 53061篇 |
2007年 | 56540篇 |
2006年 | 56914篇 |
2005年 | 54157篇 |
2004年 | 52321篇 |
2003年 | 49762篇 |
2002年 | 47942篇 |
2001年 | 92702篇 |
2000年 | 94567篇 |
1999年 | 77825篇 |
1998年 | 20108篇 |
1997年 | 17587篇 |
1996年 | 17686篇 |
1995年 | 16993篇 |
1994年 | 15517篇 |
1993年 | 14280篇 |
1992年 | 57998篇 |
1991年 | 55797篇 |
1990年 | 53460篇 |
1989年 | 51253篇 |
1988年 | 46621篇 |
1987年 | 45404篇 |
1986年 | 42655篇 |
1985年 | 40431篇 |
1984年 | 29669篇 |
1983年 | 25159篇 |
1982年 | 14045篇 |
1979年 | 25830篇 |
1978年 | 17749篇 |
1977年 | 15074篇 |
1976年 | 13963篇 |
1975年 | 14703篇 |
1974年 | 17781篇 |
1973年 | 17083篇 |
1972年 | 15821篇 |
1971年 | 14600篇 |
1970年 | 13575篇 |
1969年 | 12665篇 |
排序方式: 共有10000条查询结果,搜索用时 62 毫秒
991.
L Muscato R S Kidd 《The European journal of contraception & reproductive health care》2003,8(2):80-86
OBJECTIVES: To assess the attitudes and practices of contraceptive behaviors of Western Ukraine women. METHODS: A survey of 500 women in the Oblast was conducted to assess their knowledge, attitudes and practices on a variety of health topics. Convenience sampling was used to access the subjects in 16 different towns/villages in nine rayons throughout the Oblast. Respondents were asked more than 100 questions pertaining to their knowledge, attitudes and practices on a variety of health topics, including stress, contraception, breast health, sexually transmitted diseases, parity, abortion, nutrition, alcohol and tobacco use, domestic violence, and depression and mental health. RESULTS: Of married women, 44% (112/256) would terminate their pregnancy while 56% (144/256) said they would keep their baby. Of unmarried women, 35% (31/88) would abort while 65% (57/88) would keep their baby. A large proportion of married women (82%; 222/271) and unmarried women (70%; 52/74) did not use condoms at all. CONCLUSION: These results suggest lack of birth control education and contribution to poor protection from sexually transmitted infections. Higher abortion practices may also play a role in the infertility issues that Ukrainian women currently face. 相似文献
992.
993.
994.
995.
996.
997.
998.
999.
S L Peterson 《Brain research bulletin》1991,26(1):43-47
This study evaluates the glycine potentiation of anticonvulsant drugs in subcutaneous pentylenetetrazol seizures in rats. Administered alone, glycine (30 or 40 mM/kg, PO) induced no anticonvulsant effect or neurological deficit. Coadministered with anticonvulsants, glycine significantly enhanced the anticonvulsant potency of diazepam and sodium valproate without affecting the neurological deficit induced by the anticonvulsants. Glycine did not significantly alter the anticonvulsant activity of ethosuximide or phenobarbital. These findings indicate a possible glycine-sensitive component in the mechanism of action of diazepam and sodium divalproate in subcutaneous pentylenetetrazol seizures. With the possible exception of sodium valproate, the present study provides little support for a glycine and gamma-aminobutyric acid (GABA) interaction as a mechanism of anticonvulsant activity in SC PTZ seizures. Further studies are required to determine the role of strychnine-sensitive and strychnine-insensitive glycine receptors in this experimental model of absence epilepsy. 相似文献
1000.
P Lipiński Z Jarzabek S Broniek T Zagulski 《International journal of experimental pathology》1991,72(6):623-630
The effect of ferritins from horse (FH) and bovine (FB) spleen and murine liver (FM) on the survival rate of CFW mice lethally infected with Escherichia coli (strain 8440-78 K 80/B) was evaluated. Ferritins given intravenously 24 h before intravenous inoculation of bacteria, protected mice most effectively from death due to infection. The effect was dose dependent. At 500 micrograms of ferritin per mouse, the maximum survival rates were 86% (FH), 81% (FM) and 79% (FB), while only 5% of the control mice survived up to the 30th day. The survival rates of animals injected with bovine serum albumin (BSA) and heat-inactivated FB were 8 and 25%, respectively. Intraperitoneal injection of FB was as effective as intravenous in enhancing the resistance of mice against bacteria. These data provide evidence for the beneficial role of tissue ferritins in nonspecific antibacterial resistance. 相似文献