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   3201693篇
  免费   237492篇
  国内免费   7097篇
耳鼻咽喉   43827篇
儿科学   104354篇
妇产科学   86923篇
基础医学   469801篇
口腔科学   89490篇
临床医学   299017篇
内科学   612938篇
皮肤病学   68623篇
神经病学   258069篇
特种医学   118281篇
外国民族医学   810篇
外科学   470316篇
综合类   69689篇
现状与发展   13篇
一般理论   1224篇
预防医学   261157篇
眼科学   74093篇
药学   238153篇
  15篇
中国医学   6825篇
肿瘤学   172664篇
  2021年   25786篇
  2019年   26701篇
  2018年   37017篇
  2017年   27929篇
  2016年   30913篇
  2015年   35075篇
  2014年   49125篇
  2013年   74963篇
  2012年   102801篇
  2011年   109545篇
  2010年   64789篇
  2009年   60568篇
  2008年   101941篇
  2007年   108404篇
  2006年   109255篇
  2005年   105786篇
  2004年   101014篇
  2003年   96908篇
  2002年   93707篇
  2001年   142441篇
  2000年   146399篇
  1999年   123261篇
  1998年   36550篇
  1997年   32164篇
  1996年   32169篇
  1995年   30426篇
  1994年   28253篇
  1993年   26575篇
  1992年   96764篇
  1991年   94937篇
  1990年   92381篇
  1989年   88559篇
  1988年   81718篇
  1987年   80152篇
  1986年   75679篇
  1985年   72541篇
  1984年   54223篇
  1983年   46343篇
  1982年   27756篇
  1979年   49984篇
  1978年   35720篇
  1977年   29573篇
  1976年   28577篇
  1975年   30253篇
  1974年   36534篇
  1973年   35208篇
  1972年   32854篇
  1971年   30979篇
  1970年   28699篇
  1969年   26906篇
排序方式: 共有10000条查询结果,搜索用时 62 毫秒
181.
182.
183.
184.
185.
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   
186.
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   
187.
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   
188.
189.
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   
190.
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   
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