全文获取类型
收费全文 | 18183篇 |
免费 | 997篇 |
国内免费 | 99篇 |
专业分类
耳鼻咽喉 | 130篇 |
儿科学 | 326篇 |
妇产科学 | 335篇 |
基础医学 | 2998篇 |
口腔科学 | 384篇 |
临床医学 | 1471篇 |
内科学 | 3261篇 |
皮肤病学 | 731篇 |
神经病学 | 1986篇 |
特种医学 | 1265篇 |
外科学 | 2318篇 |
综合类 | 87篇 |
一般理论 | 6篇 |
预防医学 | 737篇 |
眼科学 | 309篇 |
药学 | 1723篇 |
中国医学 | 23篇 |
肿瘤学 | 1189篇 |
出版年
2023年 | 64篇 |
2022年 | 130篇 |
2021年 | 211篇 |
2020年 | 191篇 |
2019年 | 235篇 |
2018年 | 254篇 |
2017年 | 245篇 |
2016年 | 322篇 |
2015年 | 414篇 |
2014年 | 495篇 |
2013年 | 638篇 |
2012年 | 974篇 |
2011年 | 1130篇 |
2010年 | 696篇 |
2009年 | 701篇 |
2008年 | 1138篇 |
2007年 | 1208篇 |
2006年 | 1171篇 |
2005年 | 1146篇 |
2004年 | 1137篇 |
2003年 | 1181篇 |
2002年 | 1136篇 |
2001年 | 241篇 |
2000年 | 175篇 |
1999年 | 250篇 |
1998年 | 306篇 |
1997年 | 257篇 |
1996年 | 225篇 |
1995年 | 195篇 |
1994年 | 176篇 |
1993年 | 176篇 |
1992年 | 126篇 |
1991年 | 114篇 |
1990年 | 100篇 |
1989年 | 109篇 |
1988年 | 119篇 |
1987年 | 94篇 |
1986年 | 75篇 |
1985年 | 77篇 |
1984年 | 97篇 |
1983年 | 89篇 |
1982年 | 96篇 |
1981年 | 98篇 |
1980年 | 104篇 |
1979年 | 56篇 |
1978年 | 59篇 |
1977年 | 79篇 |
1976年 | 63篇 |
1975年 | 58篇 |
1974年 | 67篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
11.
Sami R Achem MD Alexander Klaus MD Ronald A Hinder MD PhD Kenneth R DeVault MD 《The American journal of medicine》2004,116(10):717-718
12.
Albert B. Zajko M.D. Klaus M. Bron William L. Campbell 《Cardiovascular and interventional radiology》1987,10(1):28-31
Biliary obstruction and multiple hepatic abscesses occurred in a patient after ligation of a segmental branch of the right
hepatic duct. The patient was successfully managed by transhepatic biliary drainage and balloon dilatation of an internal
fistula that developed between the ligated duct and a Roux limb of jejunum. Internal biliary fistulas may be dilated using
interventioanl radiologic techniques to permit nonobstructed bile flow. Implications for the nonsurgical treatment' of biliary
strictures are discussed. 相似文献
13.
Asymmetric Electrophilic α-Amidoalkylation, 4): Generation and Trapping Reactions of Chiral N- Acylpyrrolidiniumions The pyrrole derivatives 1 , 6 , and 10 react in the presence of TiCl4 with the silyl enol ether 3 to form α-substituted pyrrolidine amides steroselectively. 6 and 10 (after HCl-addition = > 11 ) react even at ?78°C, the reaction of 10 exceeds that of 6 in yield and stereoselectivity. 相似文献
14.
Dr Klaus Rieneck 《European journal of haematology》2006,76(5):451-452
15.
16.
17.
Klaus Hurrelmann 《Zeitschrift fur Gesundheitswissenschaften》1994,2(3):282-288
18.
The combined effects of the oligoamine RE 1492 with the NO-donor RE 2047 or ASA, ticlopidine, pentoxifylline and BM 14515 were determined in vitro (Born-test and in vivo (rat thrombosis model). The effects in vitro were supra additive but over independent. In vivo all combinations showed over additive and over independent inhibition of thrombus formation. The best results were obtained with a combination of 10 mg/kg RE 1492C and 10 mg/kg RE 2047. It inhibited thrombus formation in arterioles (A) by 79 % and 36 % in venoles (V). The combined effect of RE 1492C and pentoxifylline 10 mg/kg each was 62% (A) or 32% (V), respectively. 相似文献
19.
Alysa R. Herman MD Klaus J. Busam MD Robert A. Greenberg MD Kishwer S. Nehal MD 《Dermatologic surgery》2003,29(4):436-439
BACKGROUND: Basal cell carcinoma shows a wide spectrum of clinical and histologic appearances. A distinct tumor variant with follicular infundibulocystic differentiation is recognized, and there are only a few reports on its clinical presentation and management. OBJECTIVE: To report a case of multiple infundibulocystic basal cell carcinomas with a unique unilateral presentation. METHODS: A clinical history was obtained. Photographs were taken, and punch biopsies were performed. RESULTS: An 83-year-old Caucasian female presented with multiple unilateral, asymptomatic, skin-colored, dome-shaped papules around the right mouth for 11 years without apparent change. Punch biopsies revealed findings typical of infundibulocystic basal cell carcinoma. CONCLUSIONS: A patient with clinically indolent multiple unilateral infundibulocystic basal cell carcinomas is described. Given the location of these multiple lesions, standard treatment modalities for basal cell carcinomas would have significant cosmetic and functional implications. A management approach with clinical follow-up and surgical intervention only for changing lesions is discussed. 相似文献
20.