全文获取类型
收费全文 | 2752567篇 |
免费 | 210696篇 |
国内免费 | 7316篇 |
专业分类
耳鼻咽喉 | 36482篇 |
儿科学 | 90871篇 |
妇产科学 | 76003篇 |
基础医学 | 390278篇 |
口腔科学 | 78087篇 |
临床医学 | 250342篇 |
内科学 | 539341篇 |
皮肤病学 | 63271篇 |
神经病学 | 219166篇 |
特种医学 | 103865篇 |
外国民族医学 | 709篇 |
外科学 | 414455篇 |
综合类 | 67228篇 |
现状与发展 | 11篇 |
一般理论 | 960篇 |
预防医学 | 210686篇 |
眼科学 | 64834篇 |
药学 | 199182篇 |
25篇 | |
中国医学 | 7631篇 |
肿瘤学 | 157152篇 |
出版年
2021年 | 21986篇 |
2019年 | 22749篇 |
2018年 | 32359篇 |
2017年 | 24636篇 |
2016年 | 27327篇 |
2015年 | 30982篇 |
2014年 | 43267篇 |
2013年 | 63485篇 |
2012年 | 87243篇 |
2011年 | 92388篇 |
2010年 | 54468篇 |
2009年 | 51211篇 |
2008年 | 84992篇 |
2007年 | 90139篇 |
2006年 | 90975篇 |
2005年 | 87654篇 |
2004年 | 83988篇 |
2003年 | 79969篇 |
2002年 | 77006篇 |
2001年 | 139084篇 |
2000年 | 142618篇 |
1999年 | 118191篇 |
1998年 | 32685篇 |
1997年 | 28816篇 |
1996年 | 28818篇 |
1995年 | 27587篇 |
1994年 | 25167篇 |
1993年 | 23358篇 |
1992年 | 89895篇 |
1991年 | 86272篇 |
1990年 | 83017篇 |
1989年 | 79678篇 |
1988年 | 72931篇 |
1987年 | 71239篇 |
1986年 | 66752篇 |
1985年 | 63551篇 |
1984年 | 47447篇 |
1983年 | 40125篇 |
1982年 | 23400篇 |
1979年 | 41835篇 |
1978年 | 29119篇 |
1977年 | 24505篇 |
1976年 | 23066篇 |
1975年 | 23978篇 |
1974年 | 29034篇 |
1973年 | 28010篇 |
1972年 | 26080篇 |
1971年 | 23929篇 |
1970年 | 22552篇 |
1969年 | 21035篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
41.
42.
43.
44.
Widder Randolf A. Lappas Alexandra Rennings Corinna Hild Matthias Roessler Gernot F. Dietlein Thomas S. 《Albrecht von Graefes Archiv fur klinische und experimentelle Ophthalmologie》2020,258(11):2581-2581
Graefe's Archive for Clinical and Experimental Ophthalmology - The published online version contains mistake as the author's first name and last name have been interchanged as "Hild... 相似文献
45.
46.
Feng Wang Dachuan Wang Bingyi Tan Jun Dong Rongjie Feng Zenong Yuan Naiguo Wang 《Medicine》2015,94(39)
The present study aimed at examining the curative effect of modified posterior operation on treatment of Kümmell''s disease.About 30 patients of Kümmell''s disease with complete image and clinical data treated during June 2004 to July 2013 were conducted with anterior and posterior approaches, respectively. Kyphotic Cobb angle, fractured vertebra wedge angle, and the anterior and posterior heights of fractured vertebra were all measured through x-ray before and after operation, and the pain visual analog scale (VAS) was determined for evaluating the effect of operations. The injury and restoration of neurological function were assessed using Frankel classification.Patients in group A were treated with anterior operation, whereas group B was posterior operation. Postoperatively, VAS score, kyphotic Cobb angle, anterior vertebra height, and pathologic vertebra wedge angle were all significantly improved in patients with Kümmell''s disease receiving modified posterior operation (group B). Similar results were also observed in patients with anterior operation. The improvement of VAS and correction rate of kyphotic Cobb angle indicated equivalent effects of posterior and anterior operations. Meanwhile, alleviated neurological function damage was observed in 2 groups. Relevant factor analysis illustrated that there was no significant correlation of the severity and improvement rate of pain symptoms with age, medical history, anterior and posterior vertebra heights, kyphotic Cobb angle, and pathological vertebra wedge angle.Compared with traditional anterior approach, modified posterior operation, adopting transpedicular vertebral body grafting combined with vertebral pedicle screw fixation, could produce equivalent effects on kyphosis correction, pain relief, and improvement of neurological function in patients with Kümmell''s disease. 相似文献
47.
Philip S. Vendittelli Bassent Botros Howard S. Rosman Viren Govindaraju Anwar Zaitoun Tariq S. Marroush 《The American journal of the medical sciences》2019,357(4):333-337
Coronary embolism (CE) is an uncommon and unique cause of acute myocardial infarction. In this report, we review 216 cases of CE including 2 new cases from our institution. The mean patient age was 52.5 years and 62% of the patients were males. Chest pain was the most common presenting symptom followed by dyspnea, and the most commonly affected vessel was the left anterior descending artery. Leading etiologies of the embolus were atrial fibrillation, septic emboli, and iatrogenic causes. Treatment approaches varied with thrombus aspiration being used in 30% of cases. In-hospital mortality rate was 36% and 13% of the cases were complicated by cerebrovascular accident. CE is a unique pathology that leads to acute myocardial infarction. It portends a high mortality rate and requires a high level of suspicion as symptoms may be misleading. Further research is needed in order to improve recognition and management and to lower associated mortality. 相似文献
48.
There is a sharp difference in how one views TCR structure–function–behaviour dependent on whether its recognition of major histocompatibility complex‐encoded restriction elements (R) is germline selected or somatically generated. The generally accepted or Standard model is built on the assumption that recognition of R is by the V regions of the αβ TCR, which is not driven by allele specificity, whereas the competing model posits that recognition of R is allele‐specific. The establishing of allele‐specific recognition of R by the TCR would rule out the Standard model and clear the road to a consideration of a competing construct, the Tritope model. Here, the case for allele‐specific recognition (germline selected) is detailed making it obvious that the Standard model is untenable. 相似文献
49.
Krishna S. Iyer 《Platelets》2020,31(4):474-482
Abstract Platelets are small, anucleated effector cells that play an important role in linking the hemostatic and inflammatory processes in the body. Platelet function is known to be altered under various inflammatory conditions including aging. A gain in platelet function during aging can increase the risk of thrombotic events, such as stroke and acute myocardial infarction. Anti-platelet therapy is designed to reduce risk of serious cerebrovascular and cardiovascular events, but the adverse consequences of therapy, such as risk for bleeding increases with aging as well. Age-associated comorbidities such as obesity, diabetes, and hyperlipidemia also contribute to increased platelet activity and thus can enhance the risk of thrombosis. Therefore, identification of unique mechanisms of platelet dysfunction in aging and in age-associated comorbidities is warranted to design novel antiplatelet drugs. This review outlines some of the current areas of research on aging-related mechanisms of platelet hyperactivity and addresses the clinical urgency for designing anti-platelet therapies toward novel molecular targets in the aging population. 相似文献
50.