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   230391篇
  免费   11295篇
  国内免费   833篇
耳鼻咽喉   3241篇
儿科学   6821篇
妇产科学   5758篇
基础医学   31182篇
口腔科学   7929篇
临床医学   15631篇
内科学   56711篇
皮肤病学   7054篇
神经病学   19253篇
特种医学   5631篇
外国民族医学   30篇
外科学   29792篇
综合类   1180篇
一般理论   55篇
预防医学   20327篇
眼科学   4576篇
药学   15332篇
中国医学   927篇
肿瘤学   11089篇
  2023年   1313篇
  2022年   1962篇
  2021年   5551篇
  2020年   2945篇
  2019年   5231篇
  2018年   7497篇
  2017年   4693篇
  2016年   4775篇
  2015年   5245篇
  2014年   6943篇
  2013年   9923篇
  2012年   15571篇
  2011年   16205篇
  2010年   8725篇
  2009年   7237篇
  2008年   13362篇
  2007年   14086篇
  2006年   13246篇
  2005年   13186篇
  2004年   11830篇
  2003年   11127篇
  2002年   10426篇
  2001年   6203篇
  2000年   6679篇
  1999年   5425篇
  1998年   1631篇
  1997年   1237篇
  1996年   1121篇
  1995年   1002篇
  1994年   799篇
  1993年   714篇
  1992年   2414篇
  1991年   2174篇
  1990年   1978篇
  1989年   1703篇
  1988年   1500篇
  1987年   1444篇
  1986年   1390篇
  1985年   1257篇
  1984年   953篇
  1983年   814篇
  1979年   827篇
  1978年   585篇
  1975年   629篇
  1974年   704篇
  1973年   753篇
  1972年   636篇
  1971年   637篇
  1970年   613篇
  1969年   605篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
51.
52.
53.
Clinical Oral Investigations - The aim of this study was the analysis of WNT10A variants in seven families of probands with various forms of tooth agenesis and self-reported family history of...  相似文献   
54.
55.
Food-grade titanium dioxide (E171) is widely used as a food additive, and it is known that after oral consumption, E171 is translocated into the bloodstream reaching the highest titanium level at 6 h. E171 is accumulated in some organs triggering toxicity, but the effects on the blood parameters after oral consumption have been less studied. Recently, evidence shows that oral exposure to E171 induces behavioral signs of anxiety and depression. The relation between blood alterations and psychiatric disorders has been previously demonstrated. However, the oral exposure to E171 effects on alterations in blood parameters and effects linked to alterations in animal behavior has not been explored. In this short communication, we aimed to investigate the effects of E171 on specific blood parameters (hematocrit, hemoglobin, number of erythrocytes, and leukocytes) and anxiety and compulsive-like behavior in males and females orally exposed to ~5 mg/kg for 4 weeks. The results showed that E171 decreased hematocrit and hemoglobin in male but not in female mice while leukocyte and erythrocyte count remained unaltered. Oral consumption of E171 decreased the levels of anxiety-like behavior in females but not in male mice, while compulsive-like behavior was increased in both male and female mice.  相似文献   
56.
57.
58.
59.
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   

60.
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   
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