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   2149735篇
  免费   161101篇
  国内免费   5998篇
耳鼻咽喉   29584篇
儿科学   67433篇
妇产科学   59332篇
基础医学   313125篇
口腔科学   63438篇
临床医学   198960篇
内科学   412690篇
皮肤病学   43871篇
神经病学   178093篇
特种医学   80249篇
外国民族医学   552篇
外科学   308880篇
综合类   50299篇
现状与发展   4篇
一般理论   743篇
预防医学   182244篇
眼科学   48573篇
药学   158114篇
  6篇
中国医学   4953篇
肿瘤学   115691篇
  2021年   17557篇
  2019年   18239篇
  2018年   25459篇
  2017年   19291篇
  2016年   20729篇
  2015年   23988篇
  2014年   33611篇
  2013年   50553篇
  2012年   69910篇
  2011年   74009篇
  2010年   42568篇
  2009年   39218篇
  2008年   66970篇
  2007年   71455篇
  2006年   70927篇
  2005年   69486篇
  2004年   66813篇
  2003年   63573篇
  2002年   60138篇
  2001年   90406篇
  2000年   92431篇
  1999年   78185篇
  1998年   23205篇
  1997年   21039篇
  1996年   20666篇
  1995年   19537篇
  1994年   18530篇
  1992年   63369篇
  1991年   62076篇
  1990年   60489篇
  1989年   57765篇
  1988年   53880篇
  1987年   52763篇
  1986年   50227篇
  1985年   48240篇
  1984年   36772篇
  1983年   31429篇
  1982年   19283篇
  1979年   35065篇
  1978年   25097篇
  1977年   20826篇
  1976年   19879篇
  1975年   20966篇
  1974年   25756篇
  1973年   25001篇
  1972年   23440篇
  1971年   21805篇
  1970年   20458篇
  1969年   19350篇
  1968年   17884篇
排序方式: 共有10000条查询结果,搜索用时 4 毫秒
1.
2.
3.
4.
5.
6.
7.
8.
Objectives: The steeling effect suggests that early-life adversity can have a beneficial impact later in life. However, little is known about its underlying mechanisms and long-term outcomes . The study aimed to examine the role of early-life adversity (ELA) on successful aging, and whether this relationship can be explained by mental and physical health.

Method: Socio-demographics, early-life adversity (ELA), individual quality of life (iQoL), and mental and physical health of 270 individuals (Mage = 66.82 years, 71.5% female) were assessed. Polynomial regressions and mediation analyses were conducted.

Results: Significant inverse U-shaped associations were found between ELA and iQoL (β = ?.59, p = .005) and between ELA and mental health (β = ?.64, p = .002), but not between ELA and physical health. Furthermore, mental health significantly mediated the relationship between ELA and iQoL (b = ?.84, BCa CI [?1.66, ?.27]).

Conclusion: Highest level of individual quality of life (i.e. successful aging) was related to a moderate amount of ELA. Additionally, mental health significantly mediated this relationship. These findings suggest that some amount of ELA could be beneficial for successful aging. Resource-focused interventions are needed to improve health and promote successful aging for an underdetected, at-risk subgroup with low early-life adversity.  相似文献   

9.
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   
10.

Background

Rosacea is a chronic inflammatory skin condition whose etiology has been linked to mast cells and the antimicrobial peptide cathelicidin LL-37. Individuals with refractory disease have demonstrated clinical benefit with periodic injections of onabotulinum toxin, but the mechanism of action is unknown.

Objectives

To investigate the molecular mechanism by which botulinum toxin improves rosacea lesions.

Methods

Primary human and murine mast cells were pretreated with onabotulinum toxin A or B or control. Mast cell degranulation was evaluated by β-hexosaminidase activity. Expression of botulinum toxin receptor Sv2 was measured by qPCR. The presence of SNAP-25 and VAMP2 was established by immunofluorescence. In vivo rosacea model was established by intradermally injecting LL-37 with or without onabotulinum toxin A pretreatment. Mast cell degranulation was assessed in vivo by histologic counts. Rosacea biomarkers were analyzed by qPCR of mouse skin sections.

Results

Onabotulinum toxin A and B inhibited compound 48/80-induced degranulation of both human and murine mast cells. Expression of Sv2 was established in mouse mast cells. Onabotulinum toxin A and B increased cleaved SNAP-25 and decreased VAMP2 staining in mast cells respectively. In mice, injection of onabotulinum toxin A significantly reduced LL-37-induced skin erythema, mast cell degranulation, and mRNA expression of rosacea biomarkers.

Conclusions

These findings suggest that onabotulinum toxin reduces rosacea-associated skin inflammation by directly inhibiting mast cell degranulation. Periodic applications of onabotulinum toxin may be an effective therapy for refractory rosacea and deserves further study.  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