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   931320篇
  免费   64398篇
  国内免费   2545篇
耳鼻咽喉   12899篇
儿科学   29699篇
妇产科学   27136篇
基础医学   129668篇
口腔科学   25681篇
临床医学   77449篇
内科学   190055篇
皮肤病学   19618篇
神经病学   72886篇
特种医学   37490篇
外国民族医学   345篇
外科学   148011篇
综合类   19962篇
现状与发展   2篇
一般理论   279篇
预防医学   66719篇
眼科学   20984篇
药学   66340篇
中国医学   1998篇
肿瘤学   51042篇
  2021年   7599篇
  2018年   10604篇
  2017年   8093篇
  2016年   8722篇
  2015年   9826篇
  2014年   13800篇
  2013年   20988篇
  2012年   28092篇
  2011年   29736篇
  2010年   17883篇
  2009年   16828篇
  2008年   27703篇
  2007年   29481篇
  2006年   29474篇
  2005年   28796篇
  2004年   27529篇
  2003年   26524篇
  2002年   26018篇
  2001年   41730篇
  2000年   42877篇
  1999年   36585篇
  1998年   10167篇
  1997年   9299篇
  1996年   9209篇
  1995年   8557篇
  1994年   8179篇
  1993年   7655篇
  1992年   28377篇
  1991年   27117篇
  1990年   26543篇
  1989年   25479篇
  1988年   23673篇
  1987年   23291篇
  1986年   22360篇
  1985年   21259篇
  1984年   15890篇
  1983年   13589篇
  1982年   8138篇
  1979年   14686篇
  1978年   10262篇
  1977年   8697篇
  1976年   8197篇
  1975年   9013篇
  1974年   10760篇
  1973年   10231篇
  1972年   9695篇
  1971年   8945篇
  1970年   8608篇
  1969年   8045篇
  1968年   7701篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
3.
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   
4.
5.
6.
Abstract

This study is a single-center, retrospective analysis of postmenopausal women presenting with dyspareunia and vulvar pain, aiming to evaluate relative effectiveness of vestibular CO2 laser therapy as a treatment. Three monthly sessions of laser were performed to each patient and thereafter a three-months follow-up was stablished. A total number of 72 patients undergoing vestibular laser treatment were recruited from patient files in the period between 2016 and 2018. Among these, 39 women also received a concomitant treatment with ospemifene (60?mg/day) during the study period. There was a statistically significant reduction of all the symptoms in both groups up to the three month follow-up. Regarding dryness and dyspareunia, the relief tent to be more prominent in the ospemifene?+?laser group at all follow-ups and remained statistically significant at three-month follow-up. Specifically, vestibular dryness was significantly lower in the ospemifene?+?laser group compared with the laser treatment group (?87% vs???34%, respectively), and the vestibular health score started declining faster in the ospemifene?+?laser group. Although, additional research is needed to understand the mechanism of action, our data shows that a combination regimen of laser and ospemifene may improve clinical effectiveness for long-term treatment of symptoms associated with the under-recognized genitourinary syndrome of menopause.  相似文献   
7.
8.
According to the current nutritional recommendations issued by professional diabetes and nutrition associations, diabetic patients should keep to a diet consisting of 45–60% carbohydrates, 10–20% protein, and not more than 35% fat. However, not all of these nutritional recommendations are evidence based. For example, current studies show that the intake of insoluble roughage may be underrepresented. It is also possible that diabetic patients could benefit from keeping to the lower end of the recommended range for carbohydrates (45%) and the upper end of the range advised for protein (20%).  相似文献   
9.
10.
Conclusion  Several quality-control measures take place before (patient and camera preparation) and during SPECT acquisition to achieve high-quality images. Not uncommonly, technologists and physicians are left with suboptimal images that have to be addressed to reach the “right answer” for patient diagnosis and hence management. In many cases patients may be reimaged, especially if the problem is detected early, but in other cases either the patient has left the nuclear laboratory or there is an inevitable problem that, even with reimaging, will not be resolved. In these situations the technologist and physician have to seek the available techniques to obtain the best images possible. These resources are discussed in this issue as an aid in quality control to obtain the best possible images.  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