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   1479篇
  免费   61篇
  国内免费   71篇
耳鼻咽喉   23篇
儿科学   91篇
妇产科学   14篇
基础医学   278篇
口腔科学   28篇
临床医学   228篇
内科学   213篇
皮肤病学   49篇
神经病学   78篇
特种医学   193篇
外科学   126篇
综合类   32篇
预防医学   42篇
眼科学   4篇
药学   124篇
肿瘤学   88篇
  2021年   22篇
  2020年   19篇
  2019年   26篇
  2018年   22篇
  2017年   19篇
  2016年   22篇
  2015年   43篇
  2014年   51篇
  2013年   68篇
  2012年   61篇
  2011年   60篇
  2010年   54篇
  2009年   50篇
  2008年   54篇
  2007年   88篇
  2006年   57篇
  2005年   30篇
  2004年   50篇
  2003年   36篇
  2002年   40篇
  2001年   34篇
  2000年   40篇
  1999年   42篇
  1998年   33篇
  1997年   37篇
  1996年   34篇
  1995年   27篇
  1994年   24篇
  1993年   22篇
  1992年   15篇
  1991年   18篇
  1990年   19篇
  1989年   31篇
  1988年   33篇
  1987年   21篇
  1986年   18篇
  1985年   23篇
  1984年   10篇
  1982年   17篇
  1981年   17篇
  1980年   14篇
  1979年   12篇
  1978年   16篇
  1977年   21篇
  1976年   19篇
  1975年   15篇
  1973年   9篇
  1972年   15篇
  1968年   9篇
  1966年   9篇
排序方式: 共有1611条查询结果,搜索用时 15 毫秒
1.
2.
3.
Trauma und Berufskrankheit - Bei 4–5% aller Frakturen handelt es sich um proximale Humerusfrakturen, begünstigend wirkt v. a. die Osteoporose. Aus diesem Grund ist unter...  相似文献   
4.
麦冬类中药组织切片计算机三维重建图鉴   总被引:9,自引:0,他引:9  
利用计算机技术实现麦冬类中药组织连续切片三维重建与动态显示,为计算机辅助生药学鉴定和教学提供了新的三维图像技术和研究资料。  相似文献   
5.
6.
7.
Pre-clerking of all patients undergoing elective general surgical operations was introduced at our hospital in an attempt to reduce an unacceptably high operation cancellation rate. A prospective audit has been performed on the effect of this policy on the cancellation rate. Before the introduction of pre-clerking there was a marked seasonal variation in the number of patients who failed to attend for surgery, which could be explained by absence on holiday. This seasonal variation disappeared after the start of pre-clerking clinics, but there has been no reduction in the number of cancellations for medical reasons.  相似文献   
8.
79 patients with ischaemic stroke were investigated, with 31 patients showing a pure hemiparesis, 22 an additional depressive syndrome and 26 a dementia. After an average time intervall of 28 months, a follow-up investigation was performed on these 3 groups relative to their course and rehabilitation outcome. No significant differences were present between the 3 groups as regards age and sex distribution as well as hemisyndrome severity. The neurological and psychiatric findings at follow-up differed significantly from the primary findings. Also, significant differences were found in the degree of disability, and in the self- and family ratings of rehabilitation outcome, with a poorer long-term course, i.e. a higher degree of disability, significantly more frequent in the dementia group. Comparison of self- and family-ratings showed that self-ratings given were significantly worse in the dementia and depressive groups, whereas patients with purely neurological symptoms rated themselves better than their relatives did.  相似文献   
9.
Impact of clinical history on fracture detection with radiography   总被引:3,自引:0,他引:3  
The effect of knowledge of localizing symptoms and signs in the detection of fractures was studied. Forty radiographs of the extremities were examined twice by seven radiologists; the sessions were separated by 4 months. In 26 cases, a subtle fracture was present; 14 cases were normal. In half of the cases at each session, the precise location of pain, tenderness, or swelling was provided. The observer was asked to determine if the case was normal or abnormal (provide the exact location of the fracture) and to indicate the degree of confidence in the diagnosis. Responses were converted to a numeric scale for analysis. Analysis of receiver operator characteristic parameters indicates that clues regarding location of trauma facilitate detection of fractures. The improvement is based largely on an increased true-positive rate without an increased false-positive rate, regardless of the decision criteria of the radiologist (overall willingness to "overread" or "underread"). This has direct clinical applicability and reinforces the plea of radiologists for precise clinical information.  相似文献   
10.
王文杰  朱秀媛 《药学学报》1989,24(2):151-154
Lei Wan, Poliporus mylittae Cook et Mass(Omphalia lapidescena Scbraet) is a kind of fungus used in traditional Chinese medicine, as an antheiminthie From Lei Wan, an "active component designated as. S-4001 had been isolated.Preliminary results indicate that S-4001 belongs to D, β, 1-3 glucan with some 1-6 linkages.After administration of S-4001, significant antiinflammatory activity was found in various experimental animal models, including croton oil induced ear edema in mice and agar or yeast induced ankle swelling in rats. An inhibitory action on leucocyte migration inducced by intraperitoneal injection of CMC in rats was also observed. The plasma content of corticosterone was significantly increased, but the content of ascorbic acid in the adrenals did not change in rats given S-4001. Apart from these actions, S-4001 showed a number of immunostimulating actions such as increasing the clearance of Congo red from mice blood and potentiating the immunohemolysis reaction in 615 mice.  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