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   254432篇
  免费   11090篇
  国内免费   655篇
耳鼻咽喉   3552篇
儿科学   7119篇
妇产科学   5878篇
基础医学   35554篇
口腔科学   8718篇
临床医学   15420篇
内科学   58481篇
皮肤病学   6996篇
神经病学   21171篇
特种医学   6371篇
外国民族医学   2篇
外科学   30437篇
综合类   1172篇
一般理论   59篇
预防医学   27901篇
眼科学   6181篇
药学   19178篇
  1篇
中国医学   1031篇
肿瘤学   10955篇
  2023年   1369篇
  2022年   1221篇
  2021年   4312篇
  2020年   2392篇
  2019年   4736篇
  2018年   7952篇
  2017年   4990篇
  2016年   4983篇
  2015年   5555篇
  2014年   6496篇
  2013年   9720篇
  2012年   16492篇
  2011年   17431篇
  2010年   8849篇
  2009年   6548篇
  2008年   14457篇
  2007年   15357篇
  2006年   14483篇
  2005年   14201篇
  2004年   13012篇
  2003年   12212篇
  2002年   11521篇
  2001年   7226篇
  2000年   8096篇
  1999年   6240篇
  1998年   1204篇
  1992年   3067篇
  1991年   2675篇
  1990年   2570篇
  1989年   2174篇
  1988年   2070篇
  1987年   1946篇
  1986年   1959篇
  1985年   1808篇
  1984年   1336篇
  1983年   1141篇
  1979年   1426篇
  1978年   944篇
  1977年   913篇
  1976年   889篇
  1975年   1032篇
  1974年   1315篇
  1973年   1387篇
  1972年   1296篇
  1971年   1274篇
  1970年   1173篇
  1969年   1238篇
  1968年   1274篇
  1967年   1132篇
  1966年   999篇
排序方式: 共有10000条查询结果,搜索用时 62 毫秒
51.
52.
53.
54.
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   

55.
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   
56.
Journal of Digital Imaging - Vertebral Compression Fracture (VCF) occurs when the vertebral body partially collapses under the action of compressive forces. Non-traumatic VCFs can be secondary to...  相似文献   
57.
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   
58.
59.
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   
60.
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   
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