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   2096767篇
  免费   153945篇
  国内免费   5283篇
耳鼻咽喉   28103篇
儿科学   63046篇
妇产科学   55450篇
基础医学   304137篇
口腔科学   60433篇
临床医学   195364篇
内科学   405716篇
皮肤病学   42308篇
神经病学   169973篇
特种医学   78697篇
外国民族医学   432篇
外科学   311875篇
综合类   43787篇
现状与发展   2篇
一般理论   668篇
预防医学   163986篇
眼科学   46849篇
药学   158482篇
  9篇
中国医学   4933篇
肿瘤学   121745篇
  2019年   16110篇
  2018年   23016篇
  2017年   17543篇
  2016年   19214篇
  2015年   21935篇
  2014年   30025篇
  2013年   45854篇
  2012年   62857篇
  2011年   66351篇
  2010年   38861篇
  2009年   36240篇
  2008年   62306篇
  2007年   65563篇
  2006年   66415篇
  2005年   63973篇
  2004年   61351篇
  2003年   58577篇
  2002年   56983篇
  2001年   104469篇
  2000年   107883篇
  1999年   90244篇
  1998年   23432篇
  1997年   21042篇
  1996年   20881篇
  1995年   19670篇
  1994年   18326篇
  1993年   17067篇
  1992年   70495篇
  1991年   68438篇
  1990年   66283篇
  1989年   63732篇
  1988年   58696篇
  1987年   57158篇
  1986年   53997篇
  1985年   51655篇
  1984年   37992篇
  1983年   32259篇
  1982年   18200篇
  1979年   34227篇
  1978年   23683篇
  1977年   19783篇
  1976年   18495篇
  1975年   19519篇
  1974年   23815篇
  1973年   22889篇
  1972年   21434篇
  1971年   20183篇
  1970年   18924篇
  1969年   17492篇
  1968年   16356篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
101.
Bowel diseases of prematurity, including necrotizing enterocolitis, are dreaded ailments of neonates. Early diagnosis is difficult, with clinical and radiographic findings often inconclusive. We present a novel use of contrast-enhanced ultrasound in detection of pediatric bowel disease. Early identification of compromised blood flow or an at-risk bowel can be quantitatively detected and monitored. This ability has implications for guidance of emerging therapies, allowing targeting of inflammation. These findings represent an advancement in detection of bowel disease in neonates.  相似文献   
102.
A 17‐year‐old boy presented with recurring severe dermatitis of the face of 5‐months duration that resembled impetigo. He had been treated with several courses of antibiotics without improvement. Biopsy showed changes consistent with allergic contact dermatitis and patch testing later revealed sensitization to benzoyl peroxide, which the patient had been using for the treatment of acne vulgaris.  相似文献   
103.
104.
Abstract

Objective: To understand the origin of extremely high gonadotropin levels in a perimenopausal woman.

Methods: A 52-year-old woman with a 2?months of amenorrhea followed spontaneous menstrual cycles recovery was referred to our outpatient clinic with elevated follicle-stimulating hormone (FSH, 483 mUI/ml), luteinizing hormone (LH, 475 mUI/ml) and prolactin (PRL, 173?ng/ml). She was known to take levosulpiride. The gonadotropin levels did not fit with the clinical features.

Results: A gonadotroph tumor was ruled out. Further analysis confirmed constantly high FSH, LH and PRL levels. The measurements were repeated using different analytical platforms with different results. After serial dilutions, nonlinearity was present suggesting an immunoassay interference. After post-polyethylene glycol recovery, hormone levels appeared in the normal range. Anti-goat antibodies were recognized in the serum of the patient.

Conclusions: This case report shows a case of falsely abnormal high gonadotropin and PRL levels in a woman during menopause transition. In the clinical practice the evaluation of gonadotropin profile is not recommended at this age, but the abnormal levels stimulated further evaluation. An interference in the assay due to anti-goat antibodies resulted in abnormally high level of FSH and LH. A strict collaboration between clinicians and the laboratory is needed, when laboratory findings do not correspond to clinical findings.  相似文献   
105.
106.
107.
In 1963, Goffman argued that forming a group based on shared stigma may provide benefits. However, there is no empirical research on whether perception that a separate, unique, coherent group exists (i.e., group entitativity) influences coping, such as educating others or secrecy, for the stigmatized individual or his or her spouse. Further, little is known about how spouses influence each other in terms of promoting the education of others about a stigmatizing condition, especially when it comes to the role of believing that stigma-based groups, to which they may both belong, exist. This study provides a step toward bridging this gap in the research by applying the label management model in efforts to understand coping for couples in which one spouse is diagnosed with genetic mutations leading to alpha-1 antitrypsin deficiency (AATD). This study included 50 married couples in which one spouse is diagnosed with genetic mutations leading to alpha-1 antitrypsin deficiency (AATD). We found that group entitativity related to those with AATD counterbalanced the influence of genetic stigma on spouses’ intentions to keep the diagnosis secret or to educate others about it. Intrapersonal and interpersonal influences appeared among spouses. Attention is needed on the power of creating groups for stigmatized persons and their relatives. Indeed, people live within a dynamic world of group entities, and multiple social identities including spousal and familial. While attention has been paid to the diffusion of stigmas to loved ones, less has been paid to the uplift of group entities for them.  相似文献   
108.
109.
110.
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