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   220936篇
  免费   39183篇
  国内免费   1279篇
耳鼻咽喉   3532篇
儿科学   6080篇
妇产科学   4920篇
基础医学   22377篇
口腔科学   8374篇
临床医学   36166篇
内科学   49547篇
皮肤病学   5362篇
神经病学   24061篇
特种医学   8598篇
外国民族医学   9篇
外科学   33436篇
综合类   727篇
现状与发展   41篇
一般理论   109篇
预防医学   27459篇
眼科学   4270篇
药学   8531篇
中国医学   252篇
肿瘤学   17547篇
  2024年   579篇
  2023年   5429篇
  2022年   1595篇
  2021年   4616篇
  2020年   6627篇
  2019年   4034篇
  2018年   9289篇
  2017年   9341篇
  2016年   10086篇
  2015年   10468篇
  2014年   13817篇
  2013年   16626篇
  2012年   10994篇
  2011年   10881篇
  2010年   10509篇
  2009年   12899篇
  2008年   10064篇
  2007年   9278篇
  2006年   10123篇
  2005年   8356篇
  2004年   6925篇
  2003年   6242篇
  2002年   5720篇
  2001年   6234篇
  2000年   5508篇
  1999年   5567篇
  1998年   3670篇
  1997年   3207篇
  1996年   3328篇
  1995年   2817篇
  1994年   2165篇
  1993年   1890篇
  1992年   3431篇
  1991年   3035篇
  1990年   2782篇
  1989年   2647篇
  1988年   2457篇
  1987年   2093篇
  1986年   1989篇
  1985年   1866篇
  1984年   1374篇
  1983年   1292篇
  1982年   787篇
  1981年   698篇
  1980年   547篇
  1979年   943篇
  1978年   669篇
  1977年   570篇
  1974年   510篇
  1973年   477篇
排序方式: 共有10000条查询结果,搜索用时 296 毫秒
61.
62.
63.
64.
65.
66.
Breast elastography has been available for more than 15 years but is not widely incorporated into clinical practice. Many publications report extremely high accuracy for various breast elastographic techniques. However, results in the literature are extremely variable. This variability is most likely due to variations in technique, a relatively steep learning curve, and variability in methods between vendors. This article describes our protocol for performing breast elastography using both strain elastography and shear wave elastography, which produces high sensitivity and specificity. Additionally, we will describe the most commonly known false-positive and false-negative lesions as well as how to detect them.  相似文献   
67.
The midwifery art has emphasised the uniqueness of human beings throughout its Nordic history. The educated Nordic midwife has in the last decade celebrated several hundred years of memories. This article studies how the key ideas of the midwifery art and patterns of ideas become evident in the zeitgeist from the beginning of the 19th century to the millennium in the Nordic countries. The legacy and pattern of ideas of the art of midwifery are interpreted in relation to the texts of the selected historical sources and based on Ricoeur's phenomenological-hermeneutic approach to the text and further to the dedication of understanding and interpretation. The historical sources refer to unprinted primary sources from historical archives and printed secondary and tertiary sources. The patterns of ideas include a tripartite whole: the true cultivation of the head, the philosophy and aesthetics of the hand, the strength of the heart and the drive of calling. These ideas open for unique visions and attest to the evident in modern midwives. Today's midwives have academic training with examinations, and the education is based on scientific evidence. The midwife profession is authorised by the state and supervised by the authorities.  相似文献   
68.
69.

Background

Early dumping is a poorly defined and incompletely understood complication after Roux-en-Y gastric (RYGB).

Objective

We performed a mixed-meal tolerance test in patients after RYGB to address the prevalence of early dumping and to gain further insight into its pathophysiology.

Setting

The study was conducted in a regional hospital in the northern part of the Netherlands.

Methods

From a random sample of patients who underwent primary RYGB between 2008 and 2011, 46 patients completed the mixed-meal tolerance test. The dumping severity score for early dumping was assessed every 30 minutes. A sum score at 30 or 60 minutes of ≥5 and an incremental score of ≥3 points were defined as indicating a high suspicion of early dumping. Blood samples were collected at baseline, every 10 minutes during the first half hour, and at 60 minutes after the start.

Results

The prevalence of a high suspicion of early dumping was 26%. No differences were seen for absolute hematocrit value, inactive glucagon-like peptide-1, and vasoactive intestinal peptide between patients with or without early dumping. Patients at high suspicion of early dumping had higher levels of active glucagon-like peptide-1 and peptide YY.

Conclusion

The prevalence of complaints at high suspicion of early dumping in a random population of patients after RYGB is 26% in response to a mixed-meal tolerance test. Postprandial increases in both glucagon-like peptide-1 and peptide YY are associated with symptoms of early dumping, suggesting gut L-cell overactivity in this syndrome.  相似文献   
70.
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