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   2353570篇
  免费   171453篇
  国内免费   3333篇
耳鼻咽喉   32184篇
儿科学   75941篇
妇产科学   62747篇
基础医学   348648篇
口腔科学   63801篇
临床医学   211652篇
内科学   457882篇
皮肤病学   51766篇
神经病学   185609篇
特种医学   88132篇
外国民族医学   489篇
外科学   354332篇
综合类   47524篇
现状与发展   12篇
一般理论   848篇
预防医学   183050篇
眼科学   54421篇
药学   175277篇
  11篇
中国医学   4582篇
肿瘤学   129448篇
  2021年   19020篇
  2019年   19623篇
  2018年   27140篇
  2017年   20428篇
  2016年   22800篇
  2015年   25697篇
  2014年   36163篇
  2013年   54075篇
  2012年   74851篇
  2011年   79577篇
  2010年   47149篇
  2009年   44654篇
  2008年   74759篇
  2007年   79613篇
  2006年   80425篇
  2005年   77921篇
  2004年   74518篇
  2003年   71802篇
  2002年   69482篇
  2001年   108853篇
  2000年   111547篇
  1999年   93574篇
  1998年   27027篇
  1997年   23681篇
  1996年   24078篇
  1995年   22749篇
  1994年   20918篇
  1993年   19736篇
  1992年   72046篇
  1991年   70136篇
  1990年   68472篇
  1989年   65742篇
  1988年   60350篇
  1987年   59182篇
  1986年   55266篇
  1985年   53050篇
  1984年   39347篇
  1983年   33429篇
  1982年   19889篇
  1979年   35900篇
  1978年   25675篇
  1977年   21249篇
  1976年   20349篇
  1975年   21844篇
  1974年   26178篇
  1973年   24828篇
  1972年   23225篇
  1971年   22056篇
  1970年   20274篇
  1969年   19340篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
71.
72.
73.
74.
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   
75.
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   
76.
Vestibular function laboratories utilize a multitude of diagnostic instruments to evaluate a dizzy patient. Caloric irrigators, oculomotor stimuli, and rotational chairs produce a stimulus whose accuracy is required for the patient response to be accurate. Careful attention to everything from cleanliness of equipment to threshold adjustments determine on a daily basis if patient data are going to be correct and useful. Instrumentation specifications that change with time such as speed and temperature must periodically be checked using calibrated instruments.  相似文献   
77.
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   
78.
79.
80.
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