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   195932篇
  免费   9506篇
  国内免费   515篇
耳鼻咽喉   2892篇
儿科学   6181篇
妇产科学   4811篇
基础医学   26975篇
口腔科学   6548篇
临床医学   12939篇
内科学   47069篇
皮肤病学   6421篇
神经病学   16035篇
特种医学   4599篇
外国民族医学   30篇
外科学   24607篇
综合类   1059篇
一般理论   49篇
预防医学   18735篇
眼科学   3976篇
药学   13508篇
中国医学   841篇
肿瘤学   8678篇
  2023年   1146篇
  2022年   1686篇
  2021年   4435篇
  2020年   2324篇
  2019年   4445篇
  2018年   6382篇
  2017年   3947篇
  2016年   3883篇
  2015年   4208篇
  2014年   5538篇
  2013年   8049篇
  2012年   12838篇
  2011年   13518篇
  2010年   7177篇
  2009年   5864篇
  2008年   11011篇
  2007年   11614篇
  2006年   11008篇
  2005年   10924篇
  2004年   9827篇
  2003年   9317篇
  2002年   8802篇
  2001年   5978篇
  2000年   6529篇
  1999年   5189篇
  1998年   1314篇
  1997年   958篇
  1996年   868篇
  1995年   746篇
  1994年   597篇
  1993年   565篇
  1992年   2283篇
  1991年   2087篇
  1990年   1879篇
  1989年   1628篇
  1988年   1440篇
  1987年   1389篇
  1986年   1319篇
  1985年   1190篇
  1984年   884篇
  1983年   751篇
  1979年   788篇
  1978年   539篇
  1975年   600篇
  1974年   678篇
  1973年   729篇
  1972年   628篇
  1971年   629篇
  1970年   608篇
  1969年   596篇
排序方式: 共有10000条查询结果,搜索用时 34 毫秒
51.
52.
Background: Most theoretical models of self-determination suggest that both environmental and personal factors influence the development of self-determination. The design and implementation of interventions must be conducted with foreknowledge of such mediating and moderating factors if the intervention is to be successful.

Methods: The purpose of this study was to examine the degree to which several personal factors and school characteristics affect and explain students’ self-determination. A total of 232 students with intellectual disability from Spain participated. Their self-determination level was assessed by the ARC-INICO Scale.

Results: Students with moderate levels of intellectual disability obtained significantly lower scores on self-determination than their peers with mild intellectual disability. There were significant differences in relation to the level of support needs and their experience with transition programs. The level of support needs was a significant predictor.

Conclusion: These findings contribute to current research in this field and practical implications were discussed.  相似文献   

53.
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   
54.
55.
Clinical Rheumatology - We aimed to estimate the frequency of overlap of antineutrophil cytoplasmic antibody (ANCA)-associated vasculitis (AAV) with systemic autoimmune diseases. Retrospective...  相似文献   
56.
57.
European Journal of Clinical Microbiology & Infectious Diseases - We compared the performance of an in-house-developed flow cytometry assay for intracellular cytokine staining (FC-ICS) and a...  相似文献   
58.
Melatonin, the main hormone produced by the pineal gland, is secreted in a circadian manner (24‐hr period), and its oscillation influences several circadian biological rhythms, such as the regulation of clock genes expression (chronobiotic effect) and the modulation of several endocrine functions in peripheral tissues. Assuming that the circadian synchronization of clock genes can play a role in the regulation of energy metabolism and it is influenced by melatonin, our study was designed to assess possible alterations as a consequence of melatonin absence on the circadian expression of clock genes in the epididymal adipose tissue of male Wistar rats and the possible metabolic repercussions to this tissue. Our data show that pinealectomy indeed has impacts on molecular events: it abolishes the daily pattern of the expression of Clock, Per2, and Cry1 clock genes and Pparγ expression, significantly increases the amplitude of daily expression of Rev‐erbα, and affects the pattern of and impairs adipokine production, leading to a decrease in leptin levels. However, regarding some metabolic aspects of adipocyte functions, such as its ability to synthesize triacylglycerols from glucose along 24 hr, was not compromised by pinealectomy, although the daily profile of the lipogenic enzymes expression (ATP‐citrate lyase, malic enzyme, fatty acid synthase, and glucose‐6‐phosphate dehydrogenase) was abolished in pinealectomized animals.  相似文献   
59.
60.
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