首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   378515篇
  免费   42426篇
  国内免费   1748篇
耳鼻咽喉   6357篇
儿科学   11452篇
妇产科学   8389篇
基础医学   41284篇
口腔科学   16083篇
临床医学   44358篇
内科学   89449篇
皮肤病学   10959篇
神经病学   34726篇
特种医学   11420篇
外国民族医学   28篇
外科学   52565篇
综合类   2081篇
现状与发展   41篇
一般理论   96篇
预防医学   41813篇
眼科学   7976篇
药学   19266篇
中国医学   1304篇
肿瘤学   23042篇
  2024年   864篇
  2023年   6286篇
  2022年   3491篇
  2021年   8456篇
  2020年   8588篇
  2019年   7918篇
  2018年   15725篇
  2017年   13059篇
  2016年   13230篇
  2015年   14139篇
  2014年   18341篇
  2013年   23072篇
  2012年   22242篇
  2011年   22949篇
  2010年   16536篇
  2009年   16891篇
  2008年   18727篇
  2007年   18792篇
  2006年   18744篇
  2005年   17566篇
  2004年   15771篇
  2003年   14333篇
  2002年   12091篇
  2001年   10388篇
  2000年   10214篇
  1999年   9070篇
  1998年   4052篇
  1997年   3451篇
  1996年   3484篇
  1995年   2990篇
  1994年   2312篇
  1993年   2058篇
  1992年   4600篇
  1991年   4187篇
  1990年   3759篇
  1989年   3589篇
  1988年   3231篇
  1987年   2934篇
  1986年   2783篇
  1985年   2546篇
  1984年   1888篇
  1983年   1595篇
  1982年   933篇
  1981年   846篇
  1979年   1322篇
  1978年   943篇
  1975年   866篇
  1974年   937篇
  1973年   954篇
  1972年   815篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
3.
4.
5.
6.
7.
Abstract

Objectives: This study examined word use as an indicator of interpersonal positive reframing in daily conversations of couples coping with breast cancer and as a predictor of stress.

Design: The Electronically Activated Recorder (EAR) and Linguistic Inquiry and Word Count (LIWC) were used to examine naturally occurring word use conceptually linked to positive reframing (positive emotion, negative emotion, and cognitive processing words).

Sample: Fifty-two couples coping with breast cancer.

Methods: Couples wore the EAR, a device participants wear, that audio-recorded over one weekend (>16,000 sound files), and completed self-reports of positive reframing (COPE) and stress (Perceived Stress Scale). LIWC, a software program, measured word use.

Findings: Both partners’ word use (i.e., positive emotion and cognitive processing words) was associated with their own reported positive reframing, and spouses’ word use was also indicative of patients’ positive reframing. Results also revealed that, in general, words indicating positive reframing predicted lower levels of stress.

Conclusions: Findings supported the hypothesis that partners—and particularly spouses of breast cancer patients—may assist each other’s coping by positively reframing the cancer experience and other negative experiences in conversation.  相似文献   
8.
9.
10.

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   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号