全文获取类型
收费全文 | 701092篇 |
免费 | 66280篇 |
国内免费 | 3028篇 |
专业分类
耳鼻咽喉 | 12355篇 |
儿科学 | 23101篇 |
妇产科学 | 16359篇 |
基础医学 | 93257篇 |
口腔科学 | 16362篇 |
临床医学 | 74649篇 |
内科学 | 147462篇 |
皮肤病学 | 19803篇 |
神经病学 | 54477篇 |
特种医学 | 26263篇 |
外国民族医学 | 63篇 |
外科学 | 124501篇 |
综合类 | 9034篇 |
现状与发展 | 73篇 |
一般理论 | 174篇 |
预防医学 | 49334篇 |
眼科学 | 16156篇 |
药学 | 44087篇 |
中国医学 | 1046篇 |
肿瘤学 | 41844篇 |
出版年
2021年 | 7900篇 |
2020年 | 8651篇 |
2019年 | 7003篇 |
2018年 | 13971篇 |
2017年 | 11993篇 |
2016年 | 13423篇 |
2015年 | 14058篇 |
2014年 | 23074篇 |
2013年 | 27042篇 |
2012年 | 22124篇 |
2011年 | 23485篇 |
2010年 | 20360篇 |
2009年 | 23261篇 |
2008年 | 22021篇 |
2007年 | 21386篇 |
2006年 | 23599篇 |
2005年 | 20096篇 |
2004年 | 18845篇 |
2003年 | 16891篇 |
2002年 | 16629篇 |
2001年 | 27901篇 |
2000年 | 28107篇 |
1999年 | 23810篇 |
1998年 | 9185篇 |
1997年 | 8232篇 |
1996年 | 8410篇 |
1995年 | 7830篇 |
1994年 | 6271篇 |
1993年 | 5710篇 |
1992年 | 17115篇 |
1991年 | 17705篇 |
1990年 | 17477篇 |
1989年 | 16976篇 |
1988年 | 15587篇 |
1987年 | 15287篇 |
1986年 | 14483篇 |
1985年 | 13689篇 |
1984年 | 10185篇 |
1983年 | 8777篇 |
1979年 | 9726篇 |
1978年 | 7183篇 |
1977年 | 6164篇 |
1976年 | 5830篇 |
1975年 | 6679篇 |
1974年 | 7863篇 |
1973年 | 7362篇 |
1972年 | 7264篇 |
1971年 | 6883篇 |
1970年 | 6427篇 |
1969年 | 5965篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
3.
F. Murina R. Felice S. Di Francesco L. Nelvastellio I. Cetin 《Gynecological endocrinology》2020,36(5):431-435
AbstractThis study is a single-center, retrospective analysis of postmenopausal women presenting with dyspareunia and vulvar pain, aiming to evaluate relative effectiveness of vestibular CO2 laser therapy as a treatment. Three monthly sessions of laser were performed to each patient and thereafter a three-months follow-up was stablished. A total number of 72 patients undergoing vestibular laser treatment were recruited from patient files in the period between 2016 and 2018. Among these, 39 women also received a concomitant treatment with ospemifene (60?mg/day) during the study period. There was a statistically significant reduction of all the symptoms in both groups up to the three month follow-up. Regarding dryness and dyspareunia, the relief tent to be more prominent in the ospemifene?+?laser group at all follow-ups and remained statistically significant at three-month follow-up. Specifically, vestibular dryness was significantly lower in the ospemifene?+?laser group compared with the laser treatment group (?87% vs???34%, respectively), and the vestibular health score started declining faster in the ospemifene?+?laser group. Although, additional research is needed to understand the mechanism of action, our data shows that a combination regimen of laser and ospemifene may improve clinical effectiveness for long-term treatment of symptoms associated with the under-recognized genitourinary syndrome of menopause. 相似文献
4.
5.
6.
Xiaoxuan Liu Ameenat L. Solebo Livia Faes Sophie Beese Tasanee Braithwaite Matthew E. Round 《Ocular immunology and inflammation》2020,28(6):898-907
ABSTRACT
Purpose
New instrument-based techniques for anterior chamber (AC) cell counting can offer automation and objectivity above clinician assessment. This review aims to identify such instruments and its correlation with clinician estimates. 相似文献7.
N. V. Bashmakova G. N. Chistiakova I. A. Gazieva Y. M. Trapeznikova D. O. Mazurov 《Gynecological endocrinology》2015,31(10):31-33
AbstractThis study was undertaken to compare the concentrations of pro- and anti-angiogenic growth factors, nitric oxide (NO) stable metabolites in maternal serum and embryonic left ventricular (LV) isovolumic relaxation time (IRT, ms) during the first trimester in two groups of women: with pregnancy conceived by assisted reproductive technologies (ART, n?=?39) and normally conceived (control group, n?=?68) pregnancy. The concentration of vasoconstrictor endothelin 1 was 45.5 times more in ART than in control group. On the contrary, the concentrations of NO stable metabolites in ART were 1.9 times less than in control women. The assessment of angiogenic suppressors in ART women demonstrates the decrease in s-endoglin concentration was 1.6 times and in soluble receptor to vascular endothelial growth factor concentration was 2.0 times in comparison with control group. There was a significant increase in LV IRT in ART embryos in comparison to control ones. These data suggest significant changes in pro- anti-angiogenic factors balance and increase in vascular impedance in ART-conceived embryos. 相似文献
8.
9.
J. Rodríguez-Carrio A. Martínez-Zapico I. Cabezas-Rodríguez L. Benavente Á.I. Pérez-Álvarez P. López J.B. Cannata-Andía M. Naves-Díaz A. Suárez 《Nutrition, metabolism, and cardiovascular diseases : NMCD》2019,29(2):135-143
Background and aims
Since accelerated atherosclerosis has been reported in systemic lupus erythematosus (SLE), predictive biomarkers of cardiovascular disease (CVD) are needed. Among non-traditional risk factors, bone mineral density (BMD) has been related to CVD. However, its role in SLE remains controversial. This study aims to analyze the associations of subclinical atherosclerosis with traditional and non-traditional CV risk factors.Methods and results
In a cross-sectional study, atherosclerosis burden was compared between 112 female SLE patients and 31 controls. Plaque number and carotid intima-media wall thickness (cIMT) were assessed by ultrasonography. In a retrospective study, BMD determinations obtained 5-years before the ultrasonography assessment were analyzed in a subgroup of 62 patients. Plaque frequency was increased in SLE, even in patients without CV events or carotid wall thickening. cIMT was increased in patients with CVD, positively correlated with body mass index (BMI). Interestingly, a paradoxical effect of BMI on carotid parameters was observed. Whereas underweight patients (BMI < 20) showed increased prevalence of carotid plaques with low cIMT, those with BMI > 30 showed higher cIMT and plaque burden. Overweight patients (25 < BMI<30) exhibited both elevated cIMT and plaque number. BMI was an independent predictor of BMD. In our retrospective study, patients with either clinical or subclinical CVD exhibited lower BMD levels than their CV-free counterparts. A low lumbar spine BMD independently predicted CVD development after adjusting for confounders.Conclusion
SLE was associated with a higher subclinical atherosclerosis burden, a bimodal effect being observed for BMI. Decreased BMD can be a CV risk biomarker in SLE. 相似文献10.
Christopher N. Cooley Tyler J. Beranek Matthew A. Warpinski Robert Alexander Amanda O. Esquivel 《The American journal of emergency medicine》2019,37(2):199-203