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   3931969篇
  免费   292534篇
  国内免费   6745篇
耳鼻咽喉   56453篇
儿科学   124500篇
妇产科学   105584篇
基础医学   565242篇
口腔科学   112394篇
临床医学   361386篇
内科学   750984篇
皮肤病学   83434篇
神经病学   319638篇
特种医学   151344篇
外国民族医学   1277篇
外科学   590462篇
综合类   89574篇
现状与发展   13篇
一般理论   1606篇
预防医学   317529篇
眼科学   93816篇
药学   294153篇
  14篇
中国医学   7544篇
肿瘤学   204301篇
  2018年   42188篇
  2017年   32009篇
  2016年   35708篇
  2015年   40326篇
  2014年   57691篇
  2013年   87768篇
  2012年   119329篇
  2011年   126877篇
  2010年   75468篇
  2009年   71420篇
  2008年   119442篇
  2007年   127272篇
  2006年   128461篇
  2005年   124846篇
  2004年   120128篇
  2003年   115598篇
  2002年   113188篇
  2001年   175041篇
  2000年   180556篇
  1999年   152796篇
  1998年   45589篇
  1997年   40432篇
  1996年   40012篇
  1995年   38318篇
  1994年   35725篇
  1993年   33545篇
  1992年   121576篇
  1991年   118609篇
  1990年   115274篇
  1989年   111042篇
  1988年   102922篇
  1987年   101068篇
  1986年   95421篇
  1985年   91691篇
  1984年   69244篇
  1983年   59086篇
  1982年   35795篇
  1981年   32043篇
  1979年   64968篇
  1978年   46079篇
  1977年   38685篇
  1976年   36882篇
  1975年   39085篇
  1974年   47654篇
  1973年   45369篇
  1972年   42871篇
  1971年   40113篇
  1970年   37351篇
  1969年   35150篇
  1968年   32288篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
61.
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   
62.
63.
64.
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   
65.
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   
66.
67.
68.
69.
70.
This study used the National Survey of Ambulatory Surgery (NSAS) database to measure the incidence of and risk factors for symptoms in the ambulatory surgery center and problems within 24 h after isolated carpal tunnel release (CTR). The NSAS contained records on 400,000 adult patients with carpal tunnel syndrome who were treated with CTR in 2006, based on ICD-9 codes. The type of anesthesia used and factors associated with symptoms and problems were sought in bivariate and multivariable statistical analyses. The mean duration of the procedure was 16 ± 8.8 min. Only 5 % were performed under local anesthesia without sedation, 45 % with IV sedation, 28 % regional anesthesia, and 19 % general anesthesia. Symptoms in the ambulatory surgery center or a problem within 24 h after discharge were recorded in 10 % of patients, all of them minor and transient, including difficulties with pain and its treatment. The strongest risk factors were male sex, age of 45 years and older, and participation of an anesthesiologist. Local anesthesia and regional anesthesia were associated with more perioperative symptoms and postoperative problems. Most CTR are performed with some sedation in the United States. CTR is a safe procedure: one in 10 patients will experience a minor issue in the perioperative or immediate postoperative period.  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