全文获取类型
收费全文 | 2677篇 |
免费 | 155篇 |
国内免费 | 22篇 |
专业分类
耳鼻咽喉 | 29篇 |
儿科学 | 82篇 |
妇产科学 | 54篇 |
基础医学 | 366篇 |
口腔科学 | 52篇 |
临床医学 | 182篇 |
内科学 | 594篇 |
皮肤病学 | 26篇 |
神经病学 | 229篇 |
特种医学 | 128篇 |
外科学 | 467篇 |
综合类 | 3篇 |
一般理论 | 1篇 |
预防医学 | 150篇 |
眼科学 | 18篇 |
药学 | 164篇 |
肿瘤学 | 309篇 |
出版年
2023年 | 12篇 |
2022年 | 48篇 |
2021年 | 63篇 |
2020年 | 28篇 |
2019年 | 62篇 |
2018年 | 71篇 |
2017年 | 46篇 |
2016年 | 65篇 |
2015年 | 80篇 |
2014年 | 113篇 |
2013年 | 128篇 |
2012年 | 173篇 |
2011年 | 186篇 |
2010年 | 96篇 |
2009年 | 86篇 |
2008年 | 145篇 |
2007年 | 150篇 |
2006年 | 132篇 |
2005年 | 123篇 |
2004年 | 112篇 |
2003年 | 102篇 |
2002年 | 99篇 |
2001年 | 71篇 |
2000年 | 74篇 |
1999年 | 67篇 |
1998年 | 20篇 |
1997年 | 16篇 |
1996年 | 22篇 |
1995年 | 28篇 |
1994年 | 13篇 |
1993年 | 9篇 |
1992年 | 48篇 |
1991年 | 44篇 |
1990年 | 29篇 |
1989年 | 36篇 |
1988年 | 38篇 |
1987年 | 20篇 |
1986年 | 28篇 |
1985年 | 15篇 |
1984年 | 10篇 |
1983年 | 17篇 |
1982年 | 9篇 |
1979年 | 15篇 |
1978年 | 12篇 |
1976年 | 11篇 |
1974年 | 6篇 |
1971年 | 6篇 |
1970年 | 6篇 |
1968年 | 6篇 |
1966年 | 11篇 |
排序方式: 共有2854条查询结果,搜索用时 15 毫秒
1.
Alessia Scarselli Silvia Di Cesare Claudia Capponi Simona Cascioli Maria L. Romiti Gigliola Di Matteo Alessandra Simonetti Paolo Palma Andrea Finocchi Barbarella Lucarelli Rita M. Pinto Ippolita Rana Giuseppe Palumbo Maurizio Caniglia Paolo Rossi Rita Carsetti Caterina Cancrini Alessandro Aiuti 《Journal of clinical immunology》2015,35(4):373-383
2.
3.
Femoral access‐related complications during percutaneous transcatheter aortic valve implantation comparing single versus double Prostar XL device closure
下载免费PDF全文
![点击此处可从《Catheterization and cardiovascular interventions》网站下载免费的PDF全文](/ch/ext_images/free.gif)
4.
Indices of surgical site infection risk and prediction of other adverse outcomes during hospitalization. 总被引:2,自引:0,他引:2
Miguel Delgado-Rodríguez Silvia Palma Antonio Gómez-Ortega Gabriel Martínez-Gallego Marcelino Medina-Cuadros 《Infection control and hospital epidemiology》2006,27(8):825-828
OBJECTIVE: To assess which adverse postsurgical outcomes are best predicted by the Study on the Efficacy of Nosocomial Infection Control (SENIC) index and the National Nosocomial Infection Surveillance system (NNIS) index. DESIGN: Prospective cohort study. SETTING: The service of general surgery at a tertiary care hospital. PATIENTS: A consecutive series of patients hospitalized for more than 1 day (n=2,989). RESULTS: The outcome best predicted by the SENIC and NNIS indices was assessed by estimating the area under the receiver operating characteristic (ROC) curve. The areas under the ROC curves for nosocomial infection and in-hospital death were higher for the NNIS index than they were for the SENIC index (P<.05). The NNIS index predicted in-hospital death better than it predicted surgical site infection (area under the ROC curve+/-SE, 0.836+/-0.022 vs 0.689+/-0.017; P=.001). CONCLUSIONS: The NNIS index is superior to the SENIC index for all adverse postsurgical outcomes. Its ability to predict in-hospital mortality is clearly better than its ability to predict surgical site infection. 相似文献
5.
A 24-year-old man had unilateral gross hematuria that required nephrectomy. Pathological examination revealed massive intratubular hemorrhage and frequent deposition of an amorphous and homogeneous material positive for periodic acid, Schiff stain in the corticomedullary junction. This substance had the characteristics of Tamm-Horsfall protein and frequently herniated into the lumen of thin-walled veins of arcuate size. There was no apparent cause for the bleeding. To the best of our knowledge this is the third reported case with these peculiar findings and no apparent cause. We discuss some hypotheses as to the etiopathogenesis of this rare and intriguing condition. 相似文献
6.
7.
Marco Antonio Palma Rocio Ortiz Carlos Alvarez-Dardet Maria T. Ruiz 《Social science & medicine (1982)》2009
The possible effect of Government Consumption (a component of Gross Domestic Product (GDP)) on attainment of the hunger Millennium Development Goal (MDG1) was analyzed by evaluating the effect of macroeconomic, social, demographic and policy variables on average undernourished population. Eighty-four developing countries with data available on undernourished population were included in an ecological study. Regression models were applied to explore possible determinants of Undernourished between 1990 and 2004 and consequent achievement of the projected 2004 MDG1. In 2004, 1.4% of the overall undernourished population in the studied countries [70.16 million people] was in excess of the projected level required to meet MDG1. The multiple linear regression showed significant associations between Undernourished and poverty levels, the Gini Index, rural population and Government Consumption. The multiple logistic regression showed significant associations between achievement of projected 2004 MDG1 levels and Government Consumption and the Gini Index. The significant associations between Undernourished and Government Consumption suggest that the effects of GDP components on social conditions call for more thorough research and that policymakers such as governments and international financial institutions need to ensure that changes in distributive and redistributive policies do not negatively affect the possibility of achieving MDG1. 相似文献
8.
Franco Rilke M. D. F. R. C. Umberto Veronesi M. D. Alberto Luini M. D. Cristina Brambilla M. D. Viviana Galimberti M. D. Stefano Zurrida M. D. Silvana Pilotti M. D. M. I. A. C. Silvana Di Palma M. D. Roberto Zucali M. D. Laura Lozza M. D. 《The breast journal》1996,2(3):176-180
Abstract: Breast conservation surgery is an effective and safe treatment for many breast carcinomas. It may be possible to further limit the extent of resection (or expand the indication for breast conservation) by the application of preoperative chemotherapy and radiotherapy. We explored the feasibility of this in a pilot study.
Seventy-three patients (mean age 48, 63% premenopausal) with confirmed breast cancer, less than 2.5 cm, received chemotherapy (Group A) or chemotherapy plus radiotherapy (Group B) prior to limited resection (tumorectomy). Axillary dissection was always performed. Results: In 6/31 (19%) Group A and 17/42 (40%) Group B patients the tumor was not palpable after preoperative treatment, with complete pathological remission in 1 and 3 cases respectively. Histologic grading, mitosis, cellular alteration, and cellularity evaluations indicated a consistently greater therapeutic effect with chemoradiotherapy than with chemotherapy alone.
In conclusion, radiotherapy appears useful in the preoperative treatment of breast cancer and its use in association with various drug combinations should be further explored. 相似文献
Seventy-three patients (mean age 48, 63% premenopausal) with confirmed breast cancer, less than 2.5 cm, received chemotherapy (Group A) or chemotherapy plus radiotherapy (Group B) prior to limited resection (tumorectomy). Axillary dissection was always performed. Results: In 6/31 (19%) Group A and 17/42 (40%) Group B patients the tumor was not palpable after preoperative treatment, with complete pathological remission in 1 and 3 cases respectively. Histologic grading, mitosis, cellular alteration, and cellularity evaluations indicated a consistently greater therapeutic effect with chemoradiotherapy than with chemotherapy alone.
In conclusion, radiotherapy appears useful in the preoperative treatment of breast cancer and its use in association with various drug combinations should be further explored. 相似文献
9.
10.
E Villa I Ferretti M De Palma M Melegari P P Scaglioni P Trande C Vecchi N Fratti F Manenti 《Journal of hepatology》1991,13(2):256-259
A group of blood donors involved in post-transfusion hepatitis was investigated for the presence of the anti-HCV antibody and of HCV RNA as a more direct infection marker. RNA was extracted from serum, reverse transcribed and amplified using primers which belonged to the non structural region. The amplified product of the PCR reaction was 582 base pairs. Seven (25.9%) of the 27 blood donors examined were found anti-HCV-positive by ELISA; five (71.4%) of these were HCV RNA positive. Among the 20 anti-HCV-negative blood donors, four (20.0%) were HCV RNA positive. ALT levels were below 45 UI/l in 18 donors, while the other nine had ALTs over the limit accepted for transfusion. The anti-HCV-negative HCV RNA-positive blood donors had normal ALTs. Our study offers a direct explanation for the substantial proportion of residual cases of anti-HCV-positive post-transfusion hepatitis and suggests the necessity of creating a register of blood donors who have at some time presented blood enzyme abnormalities and for whom second level investigations such as HCV RNA should be used. 相似文献