全文获取类型
收费全文 | 87864篇 |
免费 | 6219篇 |
国内免费 | 309篇 |
专业分类
耳鼻咽喉 | 1046篇 |
儿科学 | 2242篇 |
妇产科学 | 2070篇 |
基础医学 | 14003篇 |
口腔科学 | 1992篇 |
临床医学 | 8360篇 |
内科学 | 18792篇 |
皮肤病学 | 1328篇 |
神经病学 | 8130篇 |
特种医学 | 3705篇 |
外国民族医学 | 53篇 |
外科学 | 12388篇 |
综合类 | 623篇 |
一般理论 | 87篇 |
预防医学 | 6316篇 |
眼科学 | 1425篇 |
药学 | 5937篇 |
中国医学 | 203篇 |
肿瘤学 | 5692篇 |
出版年
2022年 | 678篇 |
2021年 | 1607篇 |
2020年 | 1001篇 |
2019年 | 1483篇 |
2018年 | 1794篇 |
2017年 | 1238篇 |
2016年 | 1470篇 |
2015年 | 1793篇 |
2014年 | 2255篇 |
2013年 | 3526篇 |
2012年 | 4849篇 |
2011年 | 4938篇 |
2010年 | 3300篇 |
2009年 | 2943篇 |
2008年 | 4409篇 |
2007年 | 4578篇 |
2006年 | 4540篇 |
2005年 | 4437篇 |
2004年 | 4352篇 |
2003年 | 4013篇 |
2002年 | 4020篇 |
2001年 | 2384篇 |
2000年 | 2376篇 |
1999年 | 2222篇 |
1998年 | 1131篇 |
1997年 | 960篇 |
1996年 | 838篇 |
1995年 | 825篇 |
1994年 | 674篇 |
1993年 | 743篇 |
1992年 | 1575篇 |
1991年 | 1495篇 |
1990年 | 1424篇 |
1989年 | 1392篇 |
1988年 | 1176篇 |
1987年 | 1164篇 |
1986年 | 1101篇 |
1985年 | 1020篇 |
1984年 | 741篇 |
1983年 | 712篇 |
1982年 | 507篇 |
1981年 | 493篇 |
1980年 | 424篇 |
1979年 | 661篇 |
1978年 | 399篇 |
1977年 | 373篇 |
1975年 | 399篇 |
1974年 | 431篇 |
1973年 | 375篇 |
1972年 | 358篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
1.
2.
3.
Zhenzhen Zhang Mark Garzotto Tomasz M. Beer Philippe Thuillier Stephen Lieberman Motomi Mori 《Nutrition and cancer》2016,68(8):1309-1319
Animal and human studies suggest fish oil and green tea may have protective effect on prostate cancer. Fatty acid synthase (FAS) has been hypothesized to be linked to chemoprotective effects of both compounds. This study evaluated the independent and joint effects of fish oil (FO) and green tea supplement (epigallocatechin-3-gallate, EGCG) on FAS and Ki-67 levels in prostate tissue. Through a double-blinded, randomized controlled trial with 2 × 2 factorial design, 89 men scheduled for repeat prostate biopsy following an initial negative prostate biopsy were randomized into either FO alone (1.9 g DHA + EPA/day), EGCG alone (600 mg/day), a combination of FO and EGCG, or placebo. We used linear mixed-effects models to test the differences of prostate tissue FAS and Ki-67 by immunohistochemistry between pre- and post-intervention within each group, as well as between treatment groups. Results did not show significant difference among treatment groups in pre-to-post-intervention changes of FAS (P = 0.69) or Ki-67 (P = 0.26). Comparing placebo group with any of the treatment groups, we did not find significant difference in FAS or Ki-67 changes (all P > 0.05). Results indicate FO or EGCG supplementation for a short duration may not be sufficient to produce biologically meaningful changes in FAS or Ki-67 levels in prostate tissue. 相似文献
4.
5.
6.
Factors predicting the development of pressure ulcers in an at‐risk population who receive standardized preventive care: secondary analyses of a multicentre randomised controlled trial
下载免费PDF全文
![点击此处可从《Journal of advanced nursing》网站下载免费的PDF全文](/ch/ext_images/free.gif)
7.
8.
9.
Bielik Peter Bonczek Ondřej Krejčí Přemysl Zeman Tomáš Izakovičová-Hollá Lydie Šoukalová Jana Vaněk Jiří Vojtěšek Bořivoj Lochman Jan Balcar Vladimir J. Šerý Omar 《Clinical oral investigations》2022,26(12):7045-7055
Clinical Oral Investigations - The aim of this study was the analysis of WNT10A variants in seven families of probands with various forms of tooth agenesis and self-reported family history of... 相似文献
10.
W. Do T. Elzerman R. de Bree A. Rosenberg T. Forouzanfar E.M. Van Cann 《International journal of oral and maxillofacial surgery》2021,50(5):591-597
The aim of this study was to analyse the effect of body mass index (BMI), both low and high values, on the perioperative complication rate in patients with oral squamous cell carcinoma (OSCC). The medical records of 259 patients operated between 2014 and 2017 for OSCC were reviewed. Univariate and multivariate analyses were performed. Sixty of the 259 patients developed 87 complications. Low or high BMI was not associated with the perioperative complication rate. A longer operating time and increased blood loss were associated with a higher perioperative complication rate and higher Clavien–Dindo grade. Low BMI, American Society of Anesthesiologists score 2 and 3, a longer operating time, and increased blood loss were associated with a longer hospital stay. Low BMI was associated with a longer hospital stay. Neither low nor high BMI was associated with the perioperative complication rate. A longer operating time and increased blood loss were associated with a higher perioperative complication rate and higher Clavien–Dindo grade. 相似文献