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   1924篇
  免费   109篇
  国内免费   7篇
耳鼻咽喉   33篇
儿科学   88篇
妇产科学   33篇
基础医学   185篇
口腔科学   52篇
临床医学   166篇
内科学   452篇
皮肤病学   50篇
神经病学   93篇
特种医学   59篇
外科学   273篇
综合类   73篇
预防医学   91篇
眼科学   66篇
药学   166篇
中国医学   15篇
肿瘤学   145篇
  2023年   20篇
  2022年   46篇
  2021年   103篇
  2020年   46篇
  2019年   59篇
  2018年   73篇
  2017年   34篇
  2016年   72篇
  2015年   55篇
  2014年   100篇
  2013年   91篇
  2012年   122篇
  2011年   142篇
  2010年   89篇
  2009年   67篇
  2008年   101篇
  2007年   104篇
  2006年   93篇
  2005年   66篇
  2004年   69篇
  2003年   60篇
  2002年   48篇
  2001年   43篇
  2000年   30篇
  1999年   34篇
  1998年   14篇
  1997年   13篇
  1996年   10篇
  1995年   11篇
  1994年   8篇
  1993年   5篇
  1992年   19篇
  1991年   17篇
  1990年   18篇
  1989年   19篇
  1988年   21篇
  1987年   17篇
  1986年   18篇
  1985年   13篇
  1984年   10篇
  1983年   12篇
  1982年   2篇
  1981年   2篇
  1979年   12篇
  1978年   9篇
  1977年   7篇
  1976年   3篇
  1973年   5篇
  1970年   2篇
  1959年   1篇
排序方式: 共有2040条查询结果,搜索用时 46 毫秒
141.
As any swelling over dorsum nose is cosmetically unacceptable so is the post-operative scar. The external rhinoplasty approach proceeds in the natural tissue dissection planes in the nose, thus ensuring minimal bleeding, improved exposure and good healing with minimal scar formation. We present cases of three different swellings due to rhinophyma, dermoid cyst and a rare interesting foreign body all dealt with external rhinoplasty approach with good results.  相似文献   
142.
Sixty nine patients with sinonasal symptoms were subjected to diagnostic endoscopy. Functional endoscopic sinus surgery was done subsequently for chronic sinusitis in 42 patients, for ethmoidal polypi in 18 patients and for antrochoanal polypi in 9 patients. A follow up of 18 to 36 months ( mean 27 months) reveals a success rate of 84% in the overall study, 81.5% in patients with chronic sinusitis alone, 87.5% in ethmoidal polypi and 100% in patients with antrochoanal polyps.  相似文献   
143.
Percutaneous transthoracic needle aspiration was performed on 228 occasions to obtain lung specimens from 202 patients with suspected Pneumocystis carinii pneumonitis. In 121 patients the diagnosis was established by identifying P carinii organisms in lung aspirates. Six patients whose aspirates did not contain P carinii were found to have the organism at autopsy. Findings from toluidine blue O and Gomori methenamine silver nitrate stains were equally satisfactory for detecting P carinii, but the percentage of specific diagnosis was higher when specimens were stained with both. Pneumothorax that required a thoracotomy tube occurred in 39 patients. Other infectious agents, either bacteria or fungi, were found in only four patients. Percutaneous pulmonary needle aspiration--when performed under fluoroscopic guidance--is a rapid and effective method for the diagnosis of P carinii pneumonitis.  相似文献   
144.
145.
146.
147.

Purpose:

To monitor changes in the number of cerebral microbleeds (CMBs) in a longitudinal study of healthy controls (HC) and mild‐cognitively impaired (MCI) patients using susceptibility weighted imaging (SWI).

Materials and Methods:

SWI was used to image 28 HC and 75 MCI patients annually at 1.5 Tesla over a 4‐year period. Magnitude and phase data were used to visualize CMBs for the first and last scans of 103 subjects.

Results:

Preliminary analysis revealed that none of the 28 HC had more than three CMBs. In the 75 MCI patients, five subjects had more than three CMBs in both first and last scans, while one subject had more than three bleeds only in the last scan. In five of these six MCI patients, the number of CMBs increased over time and all six went on to develop progressive cognitive impairment (PCI). Of the 130 total CMBs seen in the last scans of the six MCI cases, most were less than 4 mm in diameter.

Conclusion:

SWI can reveal small CMBs on the order of 1 mm in diameter and this technique can be used to follow their development longitudinally. Monitoring CMBs may be a means by which to evaluate patients for the presence of microvascular disease that leads to PCI. J. Magn. Reson. Imaging 2010;31:142–148. © 2009 Wiley‐Liss, Inc.  相似文献   
148.
149.
150.
BACKGROUND: Gastric outlet obstruction is occasionally reported to occur in advanced gall bladder malignancy and may require palliative surgery. A review of 39 patients who required gastroenterostomy for symptomatic or incipient gastric outlet obstruction in carcinoma gall bladder is presented. METHODS: This retrospective review included 24 women and 15 men over nine years who underwent gastrojejunostomy for locally advanced neoplasms of the gall bladder. RESULTS: Twenty two patients with carcinoma gall bladder had symptomatic gastric outlet obstruction whereas in 17 patients gastrojejunostomy had been performed for intraoperatively assessed impending obstruction. Thirty-four patients had concomitant jaundice. In most cases, there was obstruction of the first two parts of the duodenum, mostly by direct tumoral infiltration (64%). All patients underwent anterior gastrojejunostomy, with billoenteric bypass in 15 patients. There were two postoperative deaths. Eight patients developed postoperative delayed gastric emptying; all settled on conservative management, though two patients had recurrent refractory vomiting. Thirty patients had no vomiting till a follow up ranging from 36 days to 11 months. CONCLUSIONS: Gastric outlet obstruction may frequently complicate gall bladder cancer and a satisfactory palliation can be achieved in most patients by gastrojejunostomy.  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