全文获取类型
收费全文 | 1739584篇 |
免费 | 136541篇 |
国内免费 | 2882篇 |
专业分类
耳鼻咽喉 | 24254篇 |
儿科学 | 58243篇 |
妇产科学 | 49865篇 |
基础医学 | 247218篇 |
口腔科学 | 51368篇 |
临床医学 | 151372篇 |
内科学 | 339180篇 |
皮肤病学 | 37921篇 |
神经病学 | 142668篇 |
特种医学 | 71680篇 |
外国民族医学 | 495篇 |
外科学 | 266070篇 |
综合类 | 40690篇 |
现状与发展 | 3篇 |
一般理论 | 575篇 |
预防医学 | 129408篇 |
眼科学 | 40474篇 |
药学 | 130891篇 |
3篇 | |
中国医学 | 3282篇 |
肿瘤学 | 93347篇 |
出版年
2018年 | 17207篇 |
2016年 | 15683篇 |
2015年 | 18148篇 |
2014年 | 23855篇 |
2013年 | 35915篇 |
2012年 | 49596篇 |
2011年 | 51409篇 |
2010年 | 30214篇 |
2009年 | 28371篇 |
2008年 | 49445篇 |
2007年 | 52426篇 |
2006年 | 53256篇 |
2005年 | 52253篇 |
2004年 | 51265篇 |
2003年 | 49196篇 |
2002年 | 48139篇 |
2001年 | 80013篇 |
2000年 | 82687篇 |
1999年 | 70167篇 |
1998年 | 18902篇 |
1997年 | 17296篇 |
1996年 | 17078篇 |
1995年 | 16626篇 |
1994年 | 15627篇 |
1993年 | 14734篇 |
1992年 | 57088篇 |
1991年 | 55394篇 |
1990年 | 54132篇 |
1989年 | 52247篇 |
1988年 | 48489篇 |
1987年 | 47848篇 |
1986年 | 45483篇 |
1985年 | 43973篇 |
1984年 | 32941篇 |
1983年 | 28292篇 |
1982年 | 16643篇 |
1981年 | 14902篇 |
1980年 | 14012篇 |
1979年 | 31419篇 |
1978年 | 21827篇 |
1977年 | 18394篇 |
1976年 | 17245篇 |
1975年 | 18385篇 |
1974年 | 22356篇 |
1973年 | 21414篇 |
1972年 | 19693篇 |
1971年 | 18547篇 |
1970年 | 16987篇 |
1969年 | 15909篇 |
1968年 | 14596篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
51.
Changes in Right Ventricular Shape and Deformation Following Coronary Artery Bypass Surgery—Insights from Echocardiography with Strain Rate and Magnetic Resonance Imaging 下载免费PDF全文
52.
Raphael Mohr Robert Schierwagen Carolynne Schwarze-Zander Christoph Boesecke Jan-Christian Wasmuth Jonel Trebicka Jürgen Kurt Rockstroh 《Medicine》2015,94(50)
Liver-related death in human immunodeficiency virus (HIV)-infected individuals is about 10 times higher compared with the general population, and the prevalence of significant liver fibrosis in those with HIV approaches 15%. The present study aimed to assess risk factors for development of hepatic fibrosis in HIV patients receiving a modern combination anti-retroviral therapy (cART).This cross-sectional prospective study included 432 HIV patients, of which 68 (16%) patients were anti-hepatitis C virus (HCV) positive and 23 (5%) were HBsAg positive.Health trajectory including clinical characteristics and liver fibrosis stage assessed by transient elastography were collected at inclusion. Liver stiffness values >7.1 kPa were considered as significant fibrosis, while values >12.5 kPa were defined as severe fibrosis. Logistic regression and Cox regression uni- and multivariate analyses were performed to identify independent factors associated with liver fibrosis.Significant liver fibrosis was detected in 10% of HIV mono-infected, in 37% of HCV co-infected patients, and in 18% of hepatitis B virus co-infected patients. The presence of diabetes mellitus (odds ratio [OR] = 4.6) and FIB4 score (OR = 2.4) were independently associated with presence of significant fibrosis in the whole cohort. Similarly, diabetes mellitus (OR = 5.4), adiposity (OR = 4.6), and the FIB4 score (OR = 3.3) were independently associated with significant fibrosis in HIV mono-infected patients. Importantly, cumulative cART duration protected, whereas persistent HIV viral replication promoted the development of significant liver fibrosis along the duration of HIV infection.Our findings strongly indicate that besides known risk factors like metabolic disorders, HIV may also have a direct effect on fibrogenesis. Successful cART leading to complete suppression of HIV replication might protect from development of liver fibrosis. 相似文献
53.
54.
55.
56.
57.
58.
Gwyneth R. Milbrath MSN MPH RN Pamela B. DeGuzman PhD MBA RN 《Public health nursing (Boston, Mass.)》2015,32(4):349-358
Researchers interested in measuring neighborhood‐level effects should understand how “neighborhood” is defined within nursing sciences and other sciences, and the inherent strengths and weaknesses of current research methodologies. This concept analysis provides clarity around the concept of neighborhood within the context of health, analyzes the current state of development of the neighborhood concept, and proposes areas for future nursing research. Using the Rodger's Method of analysis, the concept of neighborhood within nursing and public health research is described based on existing literature. The concept's attributes, related concepts, antecedents, and consequences are given from the literature. Comparisons of the use of neighborhood are made between nursing, public health, sociology, and other sciences. The evolution of the concept of neighborhood throughout history is described, and important implications for future research are discussed. 相似文献
59.
Miguel A. Sanz Pau Montesinos Haesook T. Kim Guillermo J. Ruiz-Argüelles María S. Undurraga María R. Uriarte Lem Martínez Rafael H. Jacomo Homero Gutiérrez-Aguirre Raul A. M. Melo Rosane Bittencourt Ricardo Pasquini Katia Pagnano Evandro M. Fagundes Edo Vellenga Alexandra Holowiecka Ana J. González-Huerta Pascual Fernández Javier De la Serna Salut Brunet Elena De Lisa José González-Campos José M. Ribera Isabel Krsnik Arnold Ganser Nancy Berliner Raul C. Ribeiro Francesco Lo-Coco Bob L?wenberg Eduardo M. Rego 《Annals of hematology》2015,94(8):1347-1356
60.
Gastroesophageal reflux is the most common benign disorder of the esophagus and laparoscopic Nissen fundoplication has become the standard surgical treatment for its treatment. In our area, where the use of bougie calibration is debatable, postoperative dysphagia is encountered often after this surgery although it is usually not permanent. The aim of this study was to investigate the effect of using a soft silicone tube 39 F in diameter for esophageal calibration during laparoscopic Nissen fundoplication on the incidence of postoperative dysphagia. We divided cases scheduled to undergo laparoscopic Nissen fundoplication between January 2009 and November 2010 into two groups, each consisting 25 patients. Esophageal calibration with a 39 F silicone orogastric tube was used for the first group while there was no operative calibration in the second group. The surgical duration was recorded; the presence and severity of the postoperative dysphagia was calculated by using a dysphagia severity scoring system during the 1-year postoperative follow-up. The dysphagia severity scores were significantly lower in group 1 than group 2 on the postoperative second day and at the end of the first week and first month. We did not find a significant difference at the end of the 6-month and first year. There was also no significant difference regarding surgery duration. The use of a soft orogastric tube 39 F in diameter for esophagus calibration during laparoscopic Nissen fundoplication has significantly decreased the incidence of postoperative transient dysphagia without affecting the duration of surgery. Although dysphagia gradually resolves in the majority of patients, a safe and easy calibration method for its prevention is worth developing, and we believe that the use of our method in larger series could be beneficial. 相似文献