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   1921875篇
  免费   127915篇
  国内免费   3945篇
耳鼻咽喉   23636篇
儿科学   62970篇
妇产科学   50295篇
基础医学   265057篇
口腔科学   52770篇
临床医学   167698篇
内科学   377704篇
皮肤病学   40745篇
神经病学   151970篇
特种医学   73736篇
外国民族医学   242篇
外科学   292618篇
综合类   41463篇
现状与发展   4篇
一般理论   562篇
预防医学   146471篇
眼科学   44068篇
药学   136794篇
  7篇
中国医学   5333篇
肿瘤学   119592篇
  2021年   13829篇
  2019年   14631篇
  2018年   41927篇
  2017年   32162篇
  2016年   35633篇
  2015年   21609篇
  2014年   28808篇
  2013年   41373篇
  2012年   64779篇
  2011年   80626篇
  2010年   52537篇
  2009年   43194篇
  2008年   74351篇
  2007年   79875篇
  2006年   60957篇
  2005年   59558篇
  2004年   58517篇
  2003年   56378篇
  2002年   52670篇
  2001年   93150篇
  2000年   95423篇
  1999年   77897篇
  1998年   20127篇
  1997年   17622篇
  1996年   17621篇
  1995年   16985篇
  1994年   15500篇
  1993年   14242篇
  1992年   57539篇
  1991年   55457篇
  1990年   53156篇
  1989年   50906篇
  1988年   46243篇
  1987年   45025篇
  1986年   42311篇
  1985年   40088篇
  1984年   29470篇
  1983年   24996篇
  1982年   14017篇
  1979年   25576篇
  1978年   17631篇
  1977年   14953篇
  1976年   13917篇
  1975年   14598篇
  1974年   17695篇
  1973年   16982篇
  1972年   15681篇
  1971年   14469篇
  1970年   13465篇
  1969年   12549篇
排序方式: 共有10000条查询结果,搜索用时 24 毫秒
91.
92.
93.
Relationship-centered care reflects both knowing and feeling: the knowledge that physician and patient bring from their respective domains of expertise, and the physician’s and patient’s experience, expression, and perception of emotions during the medical encounter. These processes are conveyed and reciprocated in the care process through verbal and nonverbal communication. We suggest that the emotional context of care is especially related to nonverbal communication and that emotion-related communication skills, including sending and receiving nonverbal messages and emotional self-awareness, are critical elements of high-quality care. Although nonverbal behavior has received far less study than other care processes, the current review argues that it holds significance for the therapeutic relationship and influences important outcomes including satisfaction, adherence, and clinical outcomes of care.  相似文献   
94.
95.
96.
OBJECTIVES: Pseudotumour cerebri has been previously recognized as a neurological side effect of combined oral contraceptives but has not been diagnosed with a delay of 3 years after initiation of combined oral contraceptives. CASE REPORT: A 19-year-old obese woman developed visual impairment and headache, 4 months after starting combined oral contraceptives. Three years later symptoms deteriorated and she presented with prominent tendon-jerks and congested optical-discs. Normal CSF drained with high pressure from the spinal tap. Pseudotumour cerebri was diagnosed. Headache and visual impairment resolved within 3 weeks after discontinuation of combined oral contraceptives. CONCLUSIONS: Combined oral contraceptives-induced pseudotumour cerebri may remain undetected for years. Young, obese women with visual impairment and headache under combined oral contraceptives should undergo immediate neurological and ophthalmological investigation.  相似文献   
97.
A 41-year-old Chinese lady had a Gr?fenberg ring in utero for 15 years. During that period of time, she had one normal vaginal delivery a year after insertion, followed by an ectopic pregnancy 12 years later. We discuss the possible mechanism of action of the Gr?fenberg ring and sequelae of its prolonged presence in the uterus.  相似文献   
98.
Postpartum fatigue is a normal condition that most women experience. Breastfeeding is often associated in women's minds as contributing to the feeling of overall perceived fatigue, and many women indicate that they have ceased breastfeeding because of fatigue. However, the relationship between feeding choice and perceived fatigue has never been established. Two hundred and fifty-three women participated in a study examining whether perceived fatigue differed for bottle-feeding and breastfeeding women at 3 different times during the postpartum period (2-4 days, 6 weeks, and 12 weeks postpartum). Results showed no significant differences for these 2 groups, suggesting that perceived fatigue during the postpartum period is not dependent on feeding choice. Additional analyses examining other variables with a potential effect were nonsignificant. Because perceived physical fatigue does not appear to be dependent on feeding choice, women should be prepared for the feeling of perceived fatigue during the postpartum period while at the same time be reassured that feeding choice is not correlated.  相似文献   
99.
100.
BACKGROUND: In the central nervous system, several neuropeptides are believed to be involved in the pathophysiology of Alzheimer's disease (AD). Indeed, previous studies have documented that glucagon-like peptide 1 (GLP-1) possesses neurotropic properties and can reduce amyloid-beta peptide levels in the brain in vivo. Moreover, the concentrations of neuropeptide Y (NPY) seem to be altered in the cerebrospinal fluid of patients with AD and in subjects with major depression. Finally, among the modifications induced by aging, a dysregulation of the ghrelin-growth hormone (GH) system has been reported. METHODS: We investigated the plasma concentrations of these neuropeptides in 14 subjects with AD. Data obtained from these patients were compared with data from an age- and weight-matched healthy group. RESULTS: No significant differences were found between the two groups in relation to plasma levels of GLP-1, NPY, ghrelin and GH. Peripheral NPY concentrations were positively correlated with ghrelin levels in both groups, and with plasma GLP-1 concentration only in controls. CONCLUSION: On the basis of our results, peripheral levels of these neuropeptides seem not to serve as biochemical markers of AD.  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