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   1281005篇
  免费   98210篇
  国内免费   1999篇
耳鼻咽喉   18442篇
儿科学   44425篇
妇产科学   35030篇
基础医学   182587篇
口腔科学   33603篇
临床医学   111546篇
内科学   258697篇
皮肤病学   28040篇
神经病学   100746篇
特种医学   51311篇
外国民族医学   660篇
外科学   196688篇
综合类   27050篇
现状与发展   1篇
一般理论   381篇
预防医学   95847篇
眼科学   27978篇
药学   94951篇
  2篇
中国医学   2427篇
肿瘤学   70802篇
  2018年   13228篇
  2017年   10018篇
  2016年   10978篇
  2015年   12463篇
  2014年   17275篇
  2013年   26356篇
  2012年   36246篇
  2011年   38294篇
  2010年   22933篇
  2009年   21905篇
  2008年   36795篇
  2007年   39409篇
  2006年   39658篇
  2005年   38582篇
  2004年   37718篇
  2003年   36556篇
  2002年   35872篇
  2001年   64003篇
  2000年   66502篇
  1999年   56419篇
  1998年   15153篇
  1997年   13774篇
  1996年   14210篇
  1995年   13466篇
  1994年   12776篇
  1993年   11803篇
  1992年   44562篇
  1991年   43472篇
  1990年   42223篇
  1989年   40117篇
  1988年   36898篇
  1987年   36238篇
  1986年   33619篇
  1985年   32282篇
  1984年   24138篇
  1983年   20270篇
  1982年   11727篇
  1981年   10692篇
  1980年   9515篇
  1979年   21343篇
  1978年   14822篇
  1977年   12532篇
  1976年   11693篇
  1975年   12623篇
  1974年   14661篇
  1973年   14118篇
  1972年   12944篇
  1971年   11729篇
  1970年   11050篇
  1969年   10024篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
951.
952.
Isolated fractures of the metacarpal and phalangeal bones are common injuries of the upper extremities. They usually occur at the age of 10–40, whereas the highest incidence is observed in childhood. The results of treatment have an important impact for the practical value of the hand. This article aims to give a brief overview of the different fracture types and their treatment options.  相似文献   
953.
954.
955.
A 50-yr-old man presented with synovitis of the metacarpophalangealjoints, Raynaud's phenomenon, recurrent pericarditis and a linearpalpable rash in both axillae.  相似文献   
956.
957.
958.
Acute myelogenous leukemia (AMU is a hematologic disorder that is characterized by an abnormal proliferation of immature myeloid cells. Granulocytic sarcomas are clusters of leukemic myeloid cells that may develop as a result of AML. Oral manifestations of AML are common and often involve enlargements of the gingiva and/or mucosal tissue from direct leukemia cell infiltration. We describe the case history of a 50-year-old man who had an ulcera-tive lesion of the oral mucosa that was determined to be a granulocytic sarcoma of AML-M0 subtype. The combination of both the subtype and clinical presentation of the leukemia makes this presentation unusual, and to the best of our knowledge, of a type that has not been previously reported in the literature.  相似文献   
959.
A common distal radio-ulnar joint (DRUJ) stabilisation procedure uses a tendon graft running from the lip of the radial sigmoid notch to the ulnar fovea and through a bony tunnel to the ulnar shaft, before being wrapped round the distal ulna and sutured to itself. Such graft fixation can be challenging and requires a considerable tendon length. The graft length could be reduced by fixing the graft to the ulna using a bone anchor or interference screw. The aim of this study was to compare the strength of three distal ulna graft fixation methods (tendon wrapping and suturing, bone anchor and interference screw). Four human cadaveric ulnae were used. A tendon strip was run through a tunnel in the distal ulna and secured by: (1) wrapping round the shaft and suturing it to itself, (2) a bone anchor and (3) an interference screw in the bone tunnel. Load to failure was determined using a custom-made apparatus and an Instron machine. Maximum failure load was highest for the bone anchor fixation (99.3 ± 23.7 N) followed by the suturing (96.2 ± 12.1 N), and the interference screw fixation (46.9 ± 5.6 N). There was no significant difference between the tendon suturing and bone anchor methods, but the tendon suturing was statistically significantly higher compared to the interference screw (P = 0.028). In performing anatomical stabilisation of the DRUJ fixation of the tendon graft to the distal ulna with a bone anchor provides the most secure fixation. This may make the stabilisation technique less demanding and require a smaller tendon graft.  相似文献   
960.
BackgroundThe incidence of strictures developing after gastrojejunostomy has been reported to range from 3% to 31%. We found an unacceptably high stricture rate (13%) using a 21-mm circular stapler. Attempts to use the 25-mm circular stapler were frustrated by disparities between the size of the instrument and the patient's anatomy. We, therefore, modified the technique to accomplish the anastomosis with the linear stapler and hand sewing (LSA) at community hospitals in Southern California.MethodsA total of 124 anastomoses were accomplished with the circular stapler (CSA) followed by 100 anastomoses using the LSA technique. Drains were used routinely with the CSA technique but were used only selectively with the LSA technique. Stricture was defined as that requiring endoscopic dilation for symptoms. Leaks were confirmed radiologically or surgically, and bleeding was defined as the need for transfusion. Our analysis used the Student t test and Fisher's exact test, with P <.05 considered statistically significant.ResultsNo patient died. The LSA technique was faster and resulted in significantly fewer postoperative strictures and complications compared with the CSA technique.ConclusionThe results of our study have shown that the LSA technique, as described, is preferable to the CSA technique.  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