全文获取类型
| 收费全文 | 229931篇 |
| 免费 | 16721篇 |
| 国内免费 | 824篇 |
专业分类
| 耳鼻咽喉 | 2577篇 |
| 儿科学 | 6046篇 |
| 妇产科学 | 4747篇 |
| 基础医学 | 29867篇 |
| 口腔科学 | 4938篇 |
| 临床医学 | 21842篇 |
| 内科学 | 49459篇 |
| 皮肤病学 | 2986篇 |
| 神经病学 | 22116篇 |
| 特种医学 | 7555篇 |
| 外国民族医学 | 13篇 |
| 外科学 | 36012篇 |
| 综合类 | 3701篇 |
| 现状与发展 | 2篇 |
| 一般理论 | 305篇 |
| 预防医学 | 20568篇 |
| 眼科学 | 4925篇 |
| 药学 | 15442篇 |
| 1篇 | |
| 中国医学 | 410篇 |
| 肿瘤学 | 13964篇 |
出版年
| 2023年 | 1014篇 |
| 2022年 | 1769篇 |
| 2021年 | 4157篇 |
| 2020年 | 2480篇 |
| 2019年 | 3964篇 |
| 2018年 | 4649篇 |
| 2017年 | 3660篇 |
| 2016年 | 3873篇 |
| 2015年 | 4625篇 |
| 2014年 | 6803篇 |
| 2013年 | 9787篇 |
| 2012年 | 14486篇 |
| 2011年 | 15731篇 |
| 2010年 | 8869篇 |
| 2009年 | 7951篇 |
| 2008年 | 14704篇 |
| 2007年 | 15548篇 |
| 2006年 | 15024篇 |
| 2005年 | 15442篇 |
| 2004年 | 14768篇 |
| 2003年 | 13740篇 |
| 2002年 | 13254篇 |
| 2001年 | 2016篇 |
| 2000年 | 1590篇 |
| 1999年 | 2199篇 |
| 1998年 | 2992篇 |
| 1997年 | 2588篇 |
| 1996年 | 2329篇 |
| 1995年 | 2069篇 |
| 1994年 | 1862篇 |
| 1993年 | 1760篇 |
| 1992年 | 1311篇 |
| 1991年 | 1243篇 |
| 1990年 | 1156篇 |
| 1989年 | 1034篇 |
| 1988年 | 1109篇 |
| 1987年 | 1127篇 |
| 1986年 | 1069篇 |
| 1985年 | 1178篇 |
| 1984年 | 1575篇 |
| 1983年 | 1553篇 |
| 1982年 | 1932篇 |
| 1981年 | 1750篇 |
| 1980年 | 1701篇 |
| 1979年 | 882篇 |
| 1978年 | 1039篇 |
| 1977年 | 1006篇 |
| 1976年 | 912篇 |
| 1975年 | 741篇 |
| 1974年 | 733篇 |
排序方式： 共有10000条查询结果，搜索用时 0 毫秒
1.
Katja T. Turunen Vasiliki Pletsa Panagiotis Georgiadis John K. Triantafillidis Dimitrios Karamanolis 《Nutrition and cancer》2016,68(4):560-567
The aim of the study was to determine the effect of β-glucan on the cytotoxicity and genotoxicity of polypectomized patient's fecal water (FW). Polypectomized volunteers (n = 69) were randomly assigned to consume bread with or without β-glucan, for 3 months. FW was collected at the beginning (t = 0), the 30th and 90th day and 2 wk after the intervention. Cytotoxicity and genotoxicity were estimated on Caco-2 cells, using trypan blue exclusion test and comet assay, respectively. Gastrointestinal symptoms were recorded and subjects kept a 3-day food diary at baseline and after completion. Trypan blue exclusion test revealed cell survival of approximately 87% after incubation with FW. The FW samples showed 49% genotoxicity at the baseline. Genotoxicity in the intervention group decreased during the trial reaching statistical significance on the 90th day compared to control. An increase was noticed 2 wk after the trial, but it still remained significantly lower compared to control. Group-specific analysis for β-glucan also revealed significant decrease in the genotoxicity on the 90th day compared to baseline. β-glucan ingestion in polypectomized patients significantly decreased the genotoxicity of their FW. Our findings suggest that β-glucan consumption could possibly provide protection against colon cancer development. 相似文献
2.
3.
4.
5.
6.
7.
8.
9.
Alexander Real Chierika Ukogu Divya Krishnamoorthy Nicole Zubizarreta Samuel K. Cho Andrew C. Hecht James C. Iatridis 《The spine journal》2019,19(2):225-231
Background Context
Low back pain (LBP) is a common complaint in clinical practice of multifactorial origin. Although obesity has been thought to contribute to LBP primarily by altering the distribution of mechanical loads on the spine, the additional contribution of obesity-related conditions such as diabetes mellitus (DM) to LBP has not been thoroughly examined.Purpose
To determine if there is a relationship between DM and LBP that is independent of body mass index (BMI) in a large cohort of adult survey participants.Study Design
Retrospective analysis of prospectively collected National Health and Nutrition Examination Survey (NHANES) data to characterize associations between LBP, DM, and BMI in adults subdivided into 6 subpopulations: normal weight (BMI 18.5–25), overweight (BMI 25–30), and obese (BMI >30) diabetics and nondiabetics. Diabetes was defined with glycohemoglobin A1c (HbA1c) ≥6.5%.Patient Sample
11,756 participants from NHANES cohort.Outcome Measures
Percentage of LBP reported.Methods
LBP reported in the 1999-2004 miscellaneous pain NHANES questionnaire was the dependent variable examined. Covariates included HbA1c, BMI, age, and family income ratio to poverty as continuous variables as well as race, gender, and smoking as binary variables. Individuals were further subdivided by weight class and diabetes status. Regression and graphical analyses were performed on the study population as a whole and also on subpopulations.Results
Increasing HbA1c did not increase the odds of reporting LBP in the full cohort. However, multivariate logistic regression of the 6 subpopulations revealed that the odds of LBP significantly increased with increasing HbA1c levels in normal weight diabetics. No other subpopulations reported significant relationships between LBP and HbA1c. LBP was also significantly associated with BMI for normal weight diabetics and also for obese subjects regardless of their DM status.Conclusions
LBP is significantly related to DM status, but this relationship is complex and may interact with BMI. These results support the concept that LBP may be improved in normal weight diabetic subjects with improved glycemic control and weight loss, and that all obese LBP subjects may benefit from improved weight loss alone. 相似文献10.
Clint R. Bellenger John B. Arnold Jonathan D. Buckley Dominic Thewlis Joel T. Fuller 《Journal of Science and Medicine in Sport》2019,22(3):294-299