全文获取类型
收费全文 | 3643篇 |
免费 | 265篇 |
国内免费 | 16篇 |
专业分类
耳鼻咽喉 | 72篇 |
儿科学 | 71篇 |
妇产科学 | 37篇 |
基础医学 | 428篇 |
口腔科学 | 71篇 |
临床医学 | 335篇 |
内科学 | 704篇 |
皮肤病学 | 55篇 |
神经病学 | 350篇 |
特种医学 | 263篇 |
外科学 | 653篇 |
综合类 | 25篇 |
一般理论 | 4篇 |
预防医学 | 271篇 |
眼科学 | 86篇 |
药学 | 186篇 |
中国医学 | 3篇 |
肿瘤学 | 310篇 |
出版年
2023年 | 58篇 |
2022年 | 87篇 |
2021年 | 187篇 |
2020年 | 117篇 |
2019年 | 154篇 |
2018年 | 162篇 |
2017年 | 119篇 |
2016年 | 123篇 |
2015年 | 185篇 |
2014年 | 173篇 |
2013年 | 184篇 |
2012年 | 286篇 |
2011年 | 247篇 |
2010年 | 145篇 |
2009年 | 112篇 |
2008年 | 180篇 |
2007年 | 197篇 |
2006年 | 144篇 |
2005年 | 144篇 |
2004年 | 141篇 |
2003年 | 83篇 |
2002年 | 99篇 |
2001年 | 39篇 |
2000年 | 44篇 |
1999年 | 40篇 |
1998年 | 18篇 |
1997年 | 23篇 |
1995年 | 12篇 |
1994年 | 15篇 |
1992年 | 29篇 |
1991年 | 37篇 |
1990年 | 28篇 |
1989年 | 24篇 |
1988年 | 21篇 |
1987年 | 21篇 |
1986年 | 22篇 |
1985年 | 18篇 |
1984年 | 12篇 |
1983年 | 15篇 |
1982年 | 7篇 |
1981年 | 9篇 |
1979年 | 12篇 |
1973年 | 12篇 |
1972年 | 9篇 |
1971年 | 7篇 |
1969年 | 7篇 |
1968年 | 9篇 |
1967年 | 9篇 |
1966年 | 10篇 |
1922年 | 7篇 |
排序方式: 共有3924条查询结果,搜索用时 15 毫秒
41.
Right heart function in impaired left ventricular diastolic function: 2D speckle tracking echocardiography–based and Doppler tissue imaging–based analysis of right atrial and ventricular function
下载免费PDF全文
![点击此处可从《Echocardiography (Mount Kisco, N.Y.)》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Anna Brand MD Marny Bathe Sabine Oertelt‐Prigione MScPH Ute Seeland MD Mirjam Rücke MSc Vera Regitz‐Zagrosek MD Karl Stangl MD Fabian Knebel MD Verena Stangl MD Henryk Dreger MD 《Echocardiography (Mount Kisco, N.Y.)》2018,35(1):47-55
Aim
The aim of our study was to describe right atrial (RA) and right ventricular (RV) function, assessed by Doppler tissue imaging and 2D speckle tracking echocardiography (2DSTE), in women with signs of early impaired left ventricular diastolic function (DD).Methods and Results
In a cross‐sectional trial, standard parameters of diastolic and right heart function were investigated in 438 women of the Berlin Female Risk Evaluation (BEFRI) study. In a subset of women, average peak systolic RA strain (RAS), as well as the average peak systolic RV strain of the free wall (RVS free wall) and of all RV segments (average RV strain; RVS Avg), was analyzed using 2DSTE. Compared to women with normal diastolic function (DD0), RAS, RVS free wall and RVS Avg were significantly reduced in DD (43.1% ± 11.9%, ?26.7% ± 5.6%, and ?23.3% ± 3.5% in DD0; vs 35.1% ± 10.4%, ?23.9% ± 5.5%, and ?20.6% ± 3.8% in DD; P < .01). Peak RV myocardial velocity (RV‐IVV) and acceleration during isovolumetric contraction (RV‐IVA) were markedly higher in DD (15.0 ± 3.9 cm/s and 3.1 ± 1.0 m/s² in DD vs 11.9 ± 3.2 cm/s and 2.8 ± 0.8 m/s² in DD0; P < .05). RAS and RV‐IVV were significantly associated with DD after adjustment to age, BMI, and left atrial strain in multivariate regression analysis.Conclusion
Systolic right heart function is significantly altered in DD. DTI as well as 2DSTE constitute sensitive echocardiographic tools that enable the diagnosis of impaired right heart mechanics in early‐staged DD. 相似文献42.
43.
Is parental oral health literacy a predictor of children's oral health outcomes? Systematic review of the literature
下载免费PDF全文
![点击此处可从《International journal of paediatric dentistry / the British Paedodontic Society [and] the International Association of Dentistry for Children》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Ramon Targino Firmino Fernanda Morais Ferreira Carolina Castro Martins Ana Flávia Granville‐Garcia Fabian Calixto Fraiz Saul Martins Paiva 《International journal of paediatric dentistry / the British Paedodontic Society [and] the International Association of Dentistry for Children》2018,28(5):459-471
44.
45.
46.
<正>Glyphosateisabroad-spectrumherbicideoriginallyintroducedto themarketin1974bytheagrochemicalcompanyMonsanto.More than 40 years down the line, glyphosate has become one of the most economically meaningful herbicides, with a global use of more than1.8 million pounds in 2014 (Benbrook, 2016). In non resistant plants, 相似文献
47.
48.
Michael Bauer Uwe Kölsch Renate Krüger Nadine Unterwalder Karin Hameister Fabian Marc Kaiser Aglaia Vignoli Rainer Rossi Maria Pilar Botella Magdalena Budisteanu Monica Rosello Carmen Orellana Maria Isabel Tejada Sorina Mihaela Papuc Oliver Patat Sophie Julia Renaud Touraine Thusari Gomes Kirsten Wenner Xiu Xu Alexandra Afenjar Annick Toutain Nicole Philip Aleksandra Jezela-Stanek Ludwig Gortner Francisco Martinez Bernard Echenne Volker Wahn Christian Meisel Dagmar Wieczorek Salima El-Chehadeh Hilde Van Esch Horst von Bernuth 《Journal of clinical immunology》2015,35(2):168-181
49.
Fabian Doerr Akmal M. A. Badreldin Ferzen Can Ole Bayer Thorsten Wahlers 《Scandinavian cardiovascular journal : SCJ》2014,48(2):111-119
Objectives. Cardiac surgery patients are excluded from SAPS2 but included in SAPS3. Neither score is evaluated for this exclusive population; however, they are used daily. We hypothesized that SAPS3 may be superior to SAPS2 in outcome prediction in cardiac surgery patients. Design. All consecutive patients undergoing cardiac surgery between January 2007 and December 2010 were included in our prospective study. Both models were tested with calibration and discrimination statistics. We compared the AUC of the ROC curves by DeLong's method and calculated OCC values. Results. A total of 5207 patients with mean age of 67.2 ± 10.9 years were admitted to the ICU. The mean length of ICU stay was 4.6 ± 7.0 days and the ICU mortality was 5.9%. The two tested models had acceptable discriminatory power (AUC: SAPS2: 0.777–0.875; SAPS3: 0.757–893). SAPS3 had a low AUC and poor calibration on admission day. SAPS2 had poor calibration on Days 1–6 and 8. Conclusions. Despite including cardiac surgery patients, SAPS3 was not superior to SAPS2 in our analysis. In this large cohort of ICU cardiac surgery patients, performance of both SAPS models was generally poor. In this subset of patients, neither scoring system is recommended. 相似文献
50.