全文获取类型
收费全文 | 14784篇 |
免费 | 1049篇 |
国内免费 | 68篇 |
专业分类
耳鼻咽喉 | 316篇 |
儿科学 | 350篇 |
妇产科学 | 252篇 |
基础医学 | 2231篇 |
口腔科学 | 310篇 |
临床医学 | 1331篇 |
内科学 | 3161篇 |
皮肤病学 | 373篇 |
神经病学 | 1384篇 |
特种医学 | 848篇 |
外国民族医学 | 4篇 |
外科学 | 2159篇 |
综合类 | 152篇 |
一般理论 | 5篇 |
预防医学 | 979篇 |
眼科学 | 151篇 |
药学 | 983篇 |
中国医学 | 11篇 |
肿瘤学 | 901篇 |
出版年
2023年 | 58篇 |
2022年 | 128篇 |
2021年 | 271篇 |
2020年 | 154篇 |
2019年 | 232篇 |
2018年 | 286篇 |
2017年 | 246篇 |
2016年 | 318篇 |
2015年 | 386篇 |
2014年 | 463篇 |
2013年 | 614篇 |
2012年 | 993篇 |
2011年 | 1051篇 |
2010年 | 578篇 |
2009年 | 569篇 |
2008年 | 947篇 |
2007年 | 1001篇 |
2006年 | 892篇 |
2005年 | 900篇 |
2004年 | 876篇 |
2003年 | 838篇 |
2002年 | 777篇 |
2001年 | 223篇 |
2000年 | 176篇 |
1999年 | 218篇 |
1998年 | 185篇 |
1997年 | 182篇 |
1996年 | 150篇 |
1995年 | 134篇 |
1994年 | 118篇 |
1993年 | 115篇 |
1992年 | 108篇 |
1991年 | 96篇 |
1990年 | 89篇 |
1989年 | 97篇 |
1988年 | 73篇 |
1987年 | 82篇 |
1986年 | 88篇 |
1985年 | 71篇 |
1984年 | 87篇 |
1983年 | 75篇 |
1982年 | 79篇 |
1981年 | 59篇 |
1980年 | 62篇 |
1979年 | 59篇 |
1978年 | 48篇 |
1975年 | 53篇 |
1974年 | 56篇 |
1973年 | 48篇 |
1972年 | 50篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
Wiener Medizinische Wochenschrift - 相似文献
2.
3.
4.
5.
6.
7.
Christoph Mulert Georg Juckel Michael Brunnmeier Susanne Karch Gregor Leicht Roland Mergl Hans-Jürgen M?ller Ulrich Hegerl Oliver Pogarell 《Clinical EEG and neuroscience》2007,38(2):78-81
During the last 10 years the knowledge about rostral anterior cingulate cortex (ACC) activity in major depression has substantially increased. Several groups have independently described a relationship between resting activity in this area and response to antidepressant treatment. We have recently confirmed a relationship between resting activity of rostral ACC activity and response in a group of 20 patients with major depression using resting theta activity. In this earlier study regions of interest (ROI) were defined in order to establish regional specificity. Differences between responders and nonresponders were only found in the ACC-ROI, but not in the posterior cingulate region. We have now reanalyzed our data using a whole brain voxelwise approach, in order not to miss any other relevant functional differences. In addition to major differences between responders and nonresponders in the rostral ACC, we have identified a nearby region in the midline orbito-frontal region. 相似文献
8.
Michiel R. de Boer Jos Twisk Annette C. Moll Hennie J. M. Völker-Dieben Henrica C. W. de Vet Ger H. M. B. van Rens 《Ophthalmic & physiological optics》2006,26(6):535-544
Consecutive patients (n = 215) who were referred to optometric (55%) or multidisciplinary (45%) low-vision services and above 50 years of age were recruited from four hospitals in the Netherlands. They completed two vision-related quality of life questionnaires, the Vision Quality of Life Core Measure (VCM1) and the Low Vision Quality of Life Questionnaire (LVQOL), before their first visit with low-vision services and 1 year later. At follow-up, patients referred to multidisciplinary low-vision services had lower scores on the mobility subscale of the LVQOL than patients referred to optometric low-vision services [5.3 points; 95% confidence interval (CI): 0.2-10.5]. Paired sample t-tests for the two groups of patients taken together show improvement for the VCM1 (3.1 points; 95% CI: 0.6-5.6) and deterioration for the basic aspects of vision (3.5 points; 95% CI: 1.1-5.9) and the mobility (6.6 points; 95% CI: 3.7-9.5) subscales of the LVQOL. In conclusion, people referred to optometric services showed less deterioration in mobility than those referred to multidisciplinary services. No differences were observed for any of the other subscales of the LVQOL and the VCM1. Future research in this field should include randomized controlled designs comparing low-vision services with no treatment or placebo. 相似文献
9.
Jean-Pierre Bassand René Faivre Pascal Berthout Jean-Claude Cardot Josette Verdenet Roland Bidet Jean-Pierre Maurat 《European journal of nuclear medicine and molecular imaging》1987,13(8):419-424
The influence of left ventricular volume variations and regurgitant fraction variations upon left ventricular ejection fraction, during exercise was examined using equilibrium radionuclide angiography in patients suffering from aortic regurgitation. Ejection fraction (EF), regurgitant fraction (RF), end diastolic volume (EDV) and end systolic volume (ESV) variations from rest to peak exercise were determined in 44 patients suffering from chronic aortic regurgitation (AR) and in 8 healthy volunteers (C). In C, EF increased (+0.10±0.03, P<0.01) and ESV decreased significantly (-23%±12%, P<0.01) RF and EDV did not vary significantly. In AR patients, EF, EDV and ESV did not vary significantly because of important scattering of individual values. Changes in EF and ESV were inversely correlated (r=-0.79, P<0.01) and RF decreased significantly (-0.12±0.10, P<0.01). Volumes and EF changes during exercise occurred in three different ways. In a 1st subgroup of 7 patients, EF increased (+0.09±0.03, P<0.05) in conjunction with a reduction of ESV (-24%±12%, P<0.05) without a significant change in EDV. In a 2nd group of 22 patients. EF decreased (-0.04±0.07, P<0.01) in association with an increase in ESV (+17%±16%, P<0.01) and no change in EDV. In a 3rd subgroup of 15 patients, EF decreased (-0.02±0.06, P<0.01) despite a reduction in ESV (-7%±6%, P<0.01) because of a dramatic EDV decrease (-10%±6%, P<0.05). In this subgroup, changes in EF were inversely correlated with changes in ESV (r=-0.55, P<0.01) and positively related to EDV variations (r=0.42, P=0.02). EDV related to EDV variations (r=0.42, P=0.02). EDV changes were weakly, but significantly, correlated to RF decrease (r=0.39, P<0.05). We conclude that changes in left ventricular ejection fraction during exercise in patients with chronic aortic regurgitation are significantly related in some patients to changes in ventricular loading conditions as well as contractile state. Therefore, a correct interpretation of EF changes during exercise requires the simultaneous determination of changes in LV volumes.Abbreviations EDV
end diastolic volume
- EF
ejection fraction
- ESV
end systolic volume
- LV
left ventricle
- RV
right ventricle 相似文献
10.
Compromise of immune function in obstructive jaundice. 总被引:5,自引:0,他引:5