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   127117篇
  免费   5746篇
  国内免费   278篇
耳鼻咽喉   2016篇
儿科学   3993篇
妇产科学   2673篇
基础医学   17182篇
口腔科学   4333篇
临床医学   7744篇
内科学   31678篇
皮肤病学   4062篇
神经病学   9997篇
特种医学   2908篇
外国民族医学   1篇
外科学   15815篇
综合类   672篇
一般理论   36篇
预防医学   12402篇
眼科学   2861篇
药学   8687篇
中国医学   616篇
肿瘤学   5465篇
  2023年   803篇
  2022年   500篇
  2021年   2564篇
  2020年   1270篇
  2019年   2876篇
  2018年   4978篇
  2017年   2895篇
  2016年   2679篇
  2015年   2986篇
  2014年   3372篇
  2013年   5133篇
  2012年   9165篇
  2011年   9823篇
  2010年   4880篇
  2009年   3391篇
  2008年   7815篇
  2007年   8375篇
  2006年   7764篇
  2005年   7699篇
  2004年   6821篇
  2003年   6410篇
  2002年   6010篇
  2001年   3834篇
  2000年   4471篇
  1999年   3298篇
  1998年   507篇
  1997年   316篇
  1996年   313篇
  1995年   248篇
  1992年   1261篇
  1991年   1052篇
  1990年   930篇
  1989年   762篇
  1988年   635篇
  1987年   621篇
  1986年   618篇
  1985年   526篇
  1984年   388篇
  1983年   297篇
  1979年   332篇
  1978年   206篇
  1975年   267篇
  1974年   316篇
  1973年   349篇
  1972年   292篇
  1971年   313篇
  1970年   292篇
  1969年   292篇
  1968年   267篇
  1967年   235篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
31.
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   

32.
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   
33.
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   
34.
35.
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   
36.
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   
37.
38.
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   
39.
40.
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