全文获取类型
收费全文 | 3040篇 |
免费 | 251篇 |
国内免费 | 24篇 |
专业分类
耳鼻咽喉 | 29篇 |
儿科学 | 192篇 |
妇产科学 | 78篇 |
基础医学 | 433篇 |
口腔科学 | 46篇 |
临床医学 | 239篇 |
内科学 | 588篇 |
皮肤病学 | 57篇 |
神经病学 | 172篇 |
特种医学 | 67篇 |
外国民族医学 | 1篇 |
外科学 | 433篇 |
综合类 | 163篇 |
一般理论 | 1篇 |
预防医学 | 258篇 |
眼科学 | 53篇 |
药学 | 228篇 |
中国医学 | 14篇 |
肿瘤学 | 263篇 |
出版年
2023年 | 20篇 |
2021年 | 91篇 |
2020年 | 41篇 |
2019年 | 76篇 |
2018年 | 63篇 |
2017年 | 60篇 |
2016年 | 82篇 |
2015年 | 84篇 |
2014年 | 106篇 |
2013年 | 131篇 |
2012年 | 175篇 |
2011年 | 191篇 |
2010年 | 99篇 |
2009年 | 101篇 |
2008年 | 155篇 |
2007年 | 160篇 |
2006年 | 157篇 |
2005年 | 154篇 |
2004年 | 155篇 |
2003年 | 118篇 |
2002年 | 98篇 |
2001年 | 76篇 |
2000年 | 78篇 |
1999年 | 75篇 |
1998年 | 28篇 |
1997年 | 21篇 |
1996年 | 15篇 |
1992年 | 33篇 |
1991年 | 46篇 |
1990年 | 47篇 |
1989年 | 28篇 |
1988年 | 28篇 |
1987年 | 29篇 |
1986年 | 28篇 |
1985年 | 30篇 |
1984年 | 18篇 |
1981年 | 20篇 |
1980年 | 16篇 |
1979年 | 30篇 |
1978年 | 23篇 |
1977年 | 22篇 |
1976年 | 16篇 |
1975年 | 22篇 |
1974年 | 22篇 |
1973年 | 27篇 |
1972年 | 23篇 |
1971年 | 25篇 |
1970年 | 16篇 |
1969年 | 19篇 |
1968年 | 13篇 |
排序方式: 共有3315条查询结果,搜索用时 203 毫秒
1.
Metabolic abnormalities of gastrointestinal mucosa in celiac disease: An in vitro proton nuclear magnetic resonance spectroscopy study 下载免费PDF全文
2.
3.
Dinesh Singhal Nandini Vasdev Arvinder Soin Subash Gupta Samiran Nundy 《Indian journal of gastroenterology》2006,25(4):206-207
It is difficult to distinguish between carcinoid tumors of the pancreatic head and periampullary region and carcinomas preoperatively. Between 1996 and 2002, 125 consecutive pancreaticoduodenectomies done by us for periampullary tumors (14 carcinoids, 111 carcinomas) were analyzed. Patients with carcinoid tumors had significantly younger mean age (48 vs. 54 years), longer history (32 vs. 8 weeks), lower serum total bilirubin levels (1.4 vs. 6.3 mg/dL) and on CT scan, had larger, well-localized tumors (5 cm vs. 2 cm). Their postoperative course was better with no mortality or major morbidity, whereas after resection for carcinoma 7 (6.3%) patients died and 30 (27%) had major postoperative complications. Thus, a tumor of this region in a young patient with indolent history, low bilirubin level and with CT scan depicting a large expansile lesion suggests a carcinoid. Such tumors may be safely resected with low postoperative morbidity and mortality and good long-term prognosis. 相似文献
4.
I. Fishtik C.A. Callaghan J.D. Fehribach R. Datta 《Journal of electroanalytical chemistry (Lausanne, Switzerland)》2005,576(1):57-63
The reaction route (RR) graph approach recently developed by us for complex, non-linear kinetic mechanisms is applied to the hydrogen oxidation and evolution reactions. A corresponding RR graph is constructed and translated into an equivalent electrical circuit network by associating each elementary step with a characteristic resistance for the steady-state case and considering the overall reaction as a power source. It is further shown that the steady-state kinetics of the reaction can be investigated employing the conventional methods of the electrical network theory. Using a set of rate constants for the hydrogen evolution reaction (her) in alkaline solutions from the literature, the dominant RRs are identified and simplified mechanisms and kinetics derived. 相似文献
5.
6.
7.
8.
9.
A. Datta R. David S. Glennie D. Scott E. Cernuda-Morollon R. I. Lechler A. J. Ridley F. M. Marelli-Berg 《American journal of transplantation》2006,6(12):2871-2883
The best-characterized mechanism of the action of immunosuppressive drugs is to prevent T-cell clonal expansion, thus containing the magnitude of the ensuing immune response. As T-cell recruitment to the inflammatory site is another key step in the development of T-cell-mediated inflammation, we analyzed and compared the effects of two commonly used immunosuppressants, cyclosporin A (CsA) and the rapamycin-related compound SDZ-RAD, on the motility of human CD4+ T cells. We show that CsA, but not SDZ-RAD, inhibits T-cell transendothelial migration in vitro. CsA selectively impaired chemokine-induced T-cell chemotaxis while integrin-mediated migration was unaffected. The inhibition of T-cell chemotaxis correlated with reduced AKT/PKB but not ERK activation following exposure to the chemokine CXCL-12/SDF-1. In addition, CsA, but not SDZ-RAD, prevents some T-cell receptor-mediated effects on T-cell motility. Finally, we show that CsA, but not SDZ-RAD inhibits tissue infiltration by T cells in vivo. Our data suggest a prominent antiinflammatory role for CsA in T-cell-mediated tissue damage, by inhibiting T-cell trafficking into tissues in addition to containing clonal expansion. 相似文献
10.