全文获取类型
收费全文 | 1278424篇 |
免费 | 98042篇 |
国内免费 | 1989篇 |
专业分类
耳鼻咽喉 | 18423篇 |
儿科学 | 44349篇 |
妇产科学 | 35008篇 |
基础医学 | 182162篇 |
口腔科学 | 33585篇 |
临床医学 | 111242篇 |
内科学 | 258206篇 |
皮肤病学 | 28020篇 |
神经病学 | 100356篇 |
特种医学 | 51198篇 |
外国民族医学 | 660篇 |
外科学 | 196374篇 |
综合类 | 27048篇 |
现状与发展 | 1篇 |
一般理论 | 377篇 |
预防医学 | 95713篇 |
眼科学 | 27912篇 |
药学 | 94762篇 |
2篇 | |
中国医学 | 2422篇 |
肿瘤学 | 70635篇 |
出版年
2018年 | 13131篇 |
2017年 | 9962篇 |
2016年 | 10896篇 |
2015年 | 12369篇 |
2014年 | 17162篇 |
2013年 | 26208篇 |
2012年 | 36016篇 |
2011年 | 38050篇 |
2010年 | 22798篇 |
2009年 | 21806篇 |
2008年 | 36634篇 |
2007年 | 39243篇 |
2006年 | 39498篇 |
2005年 | 38437篇 |
2004年 | 37589篇 |
2003年 | 36443篇 |
2002年 | 35793篇 |
2001年 | 63987篇 |
2000年 | 66494篇 |
1999年 | 56407篇 |
1998年 | 15128篇 |
1997年 | 13753篇 |
1996年 | 14195篇 |
1995年 | 13452篇 |
1994年 | 12765篇 |
1993年 | 11790篇 |
1992年 | 44555篇 |
1991年 | 43464篇 |
1990年 | 42216篇 |
1989年 | 40111篇 |
1988年 | 36894篇 |
1987年 | 36234篇 |
1986年 | 33618篇 |
1985年 | 32278篇 |
1984年 | 24136篇 |
1983年 | 20268篇 |
1982年 | 11723篇 |
1981年 | 10691篇 |
1980年 | 9515篇 |
1979年 | 21341篇 |
1978年 | 14821篇 |
1977年 | 12532篇 |
1976年 | 11693篇 |
1975年 | 12623篇 |
1974年 | 14661篇 |
1973年 | 14117篇 |
1972年 | 12944篇 |
1971年 | 11729篇 |
1970年 | 11050篇 |
1969年 | 10024篇 |
排序方式: 共有10000条查询结果,搜索用时 46 毫秒
991.
Repeated administration of the antimanic drug lithium (4 mEq/kg/day for 2, 4 or 6 days, i.p.) to rats produced a progressive decline and eventual depletion of dynorphin-A (1-8) (DYN) concentration whereas Met5-enkephalin (ENK) was only marginally decreased in the neurointermediate lobe of the pituitary (NIL). Administration of a neuroleptic haloperidol neither affected ENK and DYN levels nor influenced lithium-induced changes. The study reveals that lithium produces a preferential perturbation in the dynorphin system relative to the enkephalin system. These results taken together with other evidence, indicate that dynorphin is possibly coreleased with vasopressin following lithium administration and provide a pharmacological support to the previously described colocalization and corelease of these endogenous peptides in the NIL. 相似文献
992.
J P Murphy A V Adyanthaya P R Adams J D McArthur W E Walker 《The Annals of thoracic surgery》1987,43(3):323-325
Pulmonary artery aneurysms are rare lesions for which operative management is not frequently undertaken. When operation is indicated, central lesions involving the pulmonary trunk, right main pulmonary artery, or left main pulmonary artery are repaired using cardiopulmonary bypass. Peripheral aneurysms in segmental intrapulmonary arteries have been managed most frequently by lobectomy, but occasionally by aneurysmectomy and pulmonary arterial repair. We used cardiopulmonary bypass for peripheral pulmonary aneurysmectomy in a patient with limited respiratory reserve because he had undergone prior contralateral bilobectomy; this allowed controlled resection while preserving a maximal amount of pulmonary parenchyma. 相似文献
993.
994.
995.
996.
997.
998.
Spinal cord compression from a metastasizing burn scar cancer has not previously been reported. A patient with rapidly progressive paraparesis associated with vertebral collapse and an extradural soft tissue mass of undetermined origin is presented. The clinical history, radiological diagnosis, and histological features of cicatrial carcinoma are discussed along with a brief review of the relevant literature. 相似文献
999.
Cystoscopy using the flexible cystoscope was performed on 15 patients in the semiprone position. Ureteral catheters were placed to facilitate percutaneous nephrolithotomy in 8 patients, and indwelling ureteral stents were removed in 7. The procedure offers the urologist an additional technique in select situations. 相似文献
1000.