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   2386067篇
  免费   168266篇
  国内免费   4468篇
耳鼻咽喉   35193篇
儿科学   75482篇
妇产科学   69699篇
基础医学   340624篇
口腔科学   69881篇
临床医学   202596篇
内科学   464631篇
皮肤病学   52069篇
神经病学   187818篇
特种医学   93762篇
外国民族医学   778篇
外科学   369805篇
综合类   53049篇
现状与发展   7篇
一般理论   711篇
预防医学   170888篇
眼科学   56286篇
药学   181165篇
  5篇
中国医学   4988篇
肿瘤学   129364篇
  2018年   21627篇
  2015年   21449篇
  2014年   29836篇
  2013年   45695篇
  2012年   60925篇
  2011年   65041篇
  2010年   38645篇
  2009年   36832篇
  2008年   62869篇
  2007年   68398篇
  2006年   69373篇
  2005年   67743篇
  2004年   65487篇
  2003年   63579篇
  2002年   62719篇
  2001年   109033篇
  2000年   112204篇
  1999年   95296篇
  1998年   26300篇
  1997年   23796篇
  1996年   23458篇
  1995年   22161篇
  1994年   20985篇
  1993年   19310篇
  1992年   75675篇
  1991年   73974篇
  1990年   72861篇
  1989年   71105篇
  1988年   66263篇
  1987年   65109篇
  1986年   62210篇
  1985年   59247篇
  1984年   44375篇
  1983年   38103篇
  1982年   22754篇
  1981年   20434篇
  1979年   42372篇
  1978年   30087篇
  1977年   26040篇
  1976年   24083篇
  1975年   26945篇
  1974年   31897篇
  1973年   30876篇
  1972年   29562篇
  1971年   27544篇
  1970年   25859篇
  1969年   24979篇
  1968年   23481篇
  1967年   20798篇
  1966年   19437篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
1.
2.
3.
4.
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   
5.
6.
7.
8.
9.
Objectives: The steeling effect suggests that early-life adversity can have a beneficial impact later in life. However, little is known about its underlying mechanisms and long-term outcomes . The study aimed to examine the role of early-life adversity (ELA) on successful aging, and whether this relationship can be explained by mental and physical health.

Method: Socio-demographics, early-life adversity (ELA), individual quality of life (iQoL), and mental and physical health of 270 individuals (Mage = 66.82 years, 71.5% female) were assessed. Polynomial regressions and mediation analyses were conducted.

Results: Significant inverse U-shaped associations were found between ELA and iQoL (β = ?.59, p = .005) and between ELA and mental health (β = ?.64, p = .002), but not between ELA and physical health. Furthermore, mental health significantly mediated the relationship between ELA and iQoL (b = ?.84, BCa CI [?1.66, ?.27]).

Conclusion: Highest level of individual quality of life (i.e. successful aging) was related to a moderate amount of ELA. Additionally, mental health significantly mediated this relationship. These findings suggest that some amount of ELA could be beneficial for successful aging. Resource-focused interventions are needed to improve health and promote successful aging for an underdetected, at-risk subgroup with low early-life adversity.  相似文献   

10.

Introduction

Physician communication impacts patient outcomes. However, communication skills, especially around difficult conversations, remain suboptimal, and there is no clear way to determine the validity of entrustment decisions. The aims of this study were to 1) describe the development of a simulation-based mastery learning (SBML) curriculum for breaking bad news (BBN) conversation skills and 2) set a defensible minimum passing standard (MPS) to ensure uniform skill acquisition among learners.

Innovation

An SBML BBN curriculum was developed for fourth-year medical students. An assessment tool was created to evaluate the acquisition of skills involved in a BBN conversation. Pilot testing was completed to confirm improvement in skill acquisition and set the MPS.

Outcomes

A BBN assessment tool containing a 15-item checklist and six scaled items was developed. Students' checklist performance improved significantly at post-test compared to baseline (mean 65.33%, SD = 12.09% vs mean 88.67%, SD = 9.45%, P < 0.001). Students were also significantly more likely to have at least a score of 4 (on a five-point scale) for the six scaled questions at post-test. The MPS was set at 80%, requiring a score of 12 items on the checklist and at least 4 of 5 for each scaled item. Using the MPS, 30% of students would require additional training after post-testing.

Comments

We developed a SBML curriculum with a comprehensive assessment of BBN skills and a defensible competency standard. Future efforts will expand the mastery model to larger cohorts and assess the impact of rigorous education on patient care outcomes.  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