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   173027篇
  免费   8241篇
  国内免费   577篇
耳鼻咽喉   2767篇
儿科学   5096篇
妇产科学   3985篇
基础医学   23530篇
口腔科学   5942篇
临床医学   11387篇
内科学   41770篇
皮肤病学   5618篇
神经病学   14215篇
特种医学   4045篇
外国民族医学   2篇
外科学   20833篇
综合类   1089篇
一般理论   52篇
预防医学   16866篇
眼科学   3774篇
药学   12063篇
中国医学   931篇
肿瘤学   7880篇
  2023年   1053篇
  2022年   1645篇
  2021年   4752篇
  2020年   2387篇
  2019年   4422篇
  2018年   6189篇
  2017年   3709篇
  2016年   3602篇
  2015年   4121篇
  2014年   5518篇
  2013年   7846篇
  2012年   12089篇
  2011年   12999篇
  2010年   6884篇
  2009年   5458篇
  2008年   10093篇
  2007年   10642篇
  2006年   9866篇
  2005年   9847篇
  2004年   8751篇
  2003年   8145篇
  2002年   7583篇
  2001年   4739篇
  2000年   5290篇
  1999年   4215篇
  1998年   1012篇
  1997年   777篇
  1996年   671篇
  1995年   588篇
  1994年   489篇
  1993年   395篇
  1992年   1712篇
  1991年   1413篇
  1990年   1285篇
  1989年   1073篇
  1988年   964篇
  1987年   862篇
  1986年   857篇
  1985年   753篇
  1984年   536篇
  1983年   457篇
  1979年   499篇
  1975年   342篇
  1974年   432篇
  1973年   411篇
  1972年   364篇
  1971年   381篇
  1970年   343篇
  1969年   379篇
  1968年   331篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
51.
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   

52.
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   
53.
54.
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   
55.
56.
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   
57.
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   
58.
59.
Gray platelet syndrome (GPS) is a rare (<1/1 000 000) and inherited platelet function disorder characterized by macrothrombocytopenia, α-granule deficiency, and hemorrhages. Bleeding intensity does not correlate with platelet count nor with functional test results. We hereby describe the perioperative bleeding prevention and management of a patient with GPS requiring multiple redo cardiac surgeries.  相似文献   
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