全文获取类型
收费全文 | 23516篇 |
免费 | 6106篇 |
国内免费 | 126篇 |
专业分类
耳鼻咽喉 | 635篇 |
儿科学 | 742篇 |
妇产科学 | 735篇 |
基础医学 | 591篇 |
口腔科学 | 2731篇 |
临床医学 | 4410篇 |
内科学 | 5476篇 |
皮肤病学 | 491篇 |
神经病学 | 2126篇 |
特种医学 | 1133篇 |
外国民族医学 | 3篇 |
外科学 | 3956篇 |
综合类 | 97篇 |
现状与发展 | 12篇 |
一般理论 | 1篇 |
预防医学 | 2924篇 |
眼科学 | 416篇 |
药学 | 352篇 |
中国医学 | 6篇 |
肿瘤学 | 2911篇 |
出版年
2024年 | 164篇 |
2023年 | 1094篇 |
2022年 | 360篇 |
2021年 | 642篇 |
2020年 | 1220篇 |
2019年 | 495篇 |
2018年 | 1347篇 |
2017年 | 1296篇 |
2016年 | 1523篇 |
2015年 | 1580篇 |
2014年 | 1984篇 |
2013年 | 2416篇 |
2012年 | 824篇 |
2011年 | 803篇 |
2010年 | 1396篇 |
2009年 | 1981篇 |
2008年 | 862篇 |
2007年 | 609篇 |
2006年 | 775篇 |
2005年 | 571篇 |
2004年 | 428篇 |
2003年 | 398篇 |
2002年 | 344篇 |
2001年 | 466篇 |
2000年 | 373篇 |
1999年 | 459篇 |
1998年 | 525篇 |
1997年 | 510篇 |
1996年 | 553篇 |
1995年 | 406篇 |
1994年 | 315篇 |
1993年 | 289篇 |
1992年 | 252篇 |
1991年 | 227篇 |
1990年 | 211篇 |
1989年 | 215篇 |
1988年 | 179篇 |
1987年 | 175篇 |
1986年 | 160篇 |
1985年 | 148篇 |
1984年 | 138篇 |
1983年 | 134篇 |
1982年 | 109篇 |
1981年 | 90篇 |
1980年 | 79篇 |
1979年 | 88篇 |
1978年 | 67篇 |
1977年 | 62篇 |
1976年 | 49篇 |
1975年 | 50篇 |
排序方式: 共有10000条查询结果,搜索用时 687 毫秒
31.
Double-blind, placebo-controlled comparison of clonazepam and alprazolam for panic disorder 总被引:1,自引:0,他引:1
G E Tesar J F Rosenbaum M H Pollack M W Otto G S Sachs J B Herman L S Cohen S A Spier 《The Journal of clinical psychiatry》1991,52(2):69-76
To test the reported antipanic efficacy of clonazepam, the authors randomized 72 subjects with panic disorder to 6 weeks of treatment with either alprazolam, clonazepam, or placebo. Endpoint analysis demonstrated a significant beneficial effect of both active treatments, but not placebo treatment, on the frequency of panic attacks, overall phobia ratings, and the extent of disability. Comparison of the two active treatments revealed no significant differences and no consistent tendency for one agent to be favored over another, although power to detect small differences was limited. Sedation and ataxia were the most common side effects reported, but these effects were mild and transient and did not interfere with treatment outcome. The results of this double-blind, placebo-controlled trial are consistent with previous reports of clonazepam's antipanic efficacy. 相似文献
32.
33.
Transcutaneous oxygen (TcPO(2)) measurements provide a noninvasive, objective determination of the oxygen level at the skin surface. This offers a means of estimating the underlying circulation and tissue oxygenation. The purpose of the pilot study was to measure the TcPO(2) value of the lower extremity of healthy men and women and of patients with peripheral arterial disease (PAD) in 4 different body and leg positions 24 hours after peripheral vascular surgery reconstruction. The specific aim was to determine if lower-extremity TcPO(2) measurements were affected by changes in extremity position in these subject populations. A convenience sample of 4 healthy health care professionals and 4 patients who had peripheral vascular reconstruction surgery 24 hours before the measurements were studied. Subjects were studied in 4 different leg and body positions: supine with legs extended, sitting with legs dependent, a 5 degrees head-up reverse Trendelenburg, and supine with legs elevated 10 in. The Radiometer TCM30 TcPO(2) monitor was used to carry out these measures. Findings revealed a statistically significant difference in TcPO(2) measurements between the 2 groups, with the healthy subjects having a significantly higher TcPO(2) measurement in all extremity positions compared with the revascularized subjects with PAD (P =.02-.05). Significant changes were noted in both the foot temperature (P =.03) and TcPO(2) measurements with extremity positions within the healthy subject group (P =.001). The foot and leg TcPO(2) measurements affect from leg and body position did not reach significance (P =.09) in the subjects with PAD. No change in foot temperature with extremity positioning (P =.42) was noted in the subjects with PAD. This pilot study provides a base in which additional research will be performed with TcPO(2) measurements in both the healthy and revascularized person. 相似文献
34.
Michael C. Dalsing MD Melissa Kevorkian BS Beth Raper BA Craig Nixon MS Stephen G. Lalka MD Dolores F. Cikrit MD Joseph L. Unthank PhD Malcolm B. Herring MD 《Annals of vascular surgery》1989,3(2):127-133
This study evaluates the potential for endothelial seeding of a collagen-impregnated Dacron graft with or without surface modifiers (fibronectin, heparin) to attach and retain these cells during flow. Human umbilical endothelial cells were harvested, cultured, labeled with Indium111-oxine and seeded onto 30 mm X 4 mm diameter grafts. Six graft surfaces were studied: 1) a collagen-impregnated Dacron graft, HemashieldR (C); 2) C + fibronectin (C + F); 3) C + heparin (C + H); 4) C + F + H; 5) HytrelR + F (Hyt + F); and 6) Hyt + F + H. Radioactive loss determined the percentage attachment and then percentage retention of labeled inoculum after a one-hour in vitro perfusion. Scanning electron and light microscopy demonstrated the endothelium on the graft surface following perfusion. Fibronectin-coated grafts had a significantly higher percentage attachment than those without fibronectin (ANOVA, P less than 0.05). However, the percentage retention following perfusion was similar for all Dacron grafts and statistically inferior to the HytrelR grafts studied (ANOVA, P less than 0.05). SEM evaluation of the C + F + H graft surface was qualitatively the most impressive Dacron surface for seeding, yet was inferior to the HytrelR graft. We conclude that fibronectin benefits the initial attachment of endothelium to collagen-coated Dacron rivaling the HytrelR surface. Fibronectin does not improve percentage retention of the HemashieldR surface during perfusion, therefore, some of its initial benefit is lost. 相似文献
35.
36.
37.
38.
39.
40.