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   2370篇
  免费   245篇
  国内免费   46篇
耳鼻咽喉   3篇
儿科学   128篇
妇产科学   76篇
基础医学   256篇
口腔科学   52篇
临床医学   252篇
内科学   585篇
皮肤病学   48篇
神经病学   143篇
特种医学   196篇
外科学   318篇
综合类   38篇
预防医学   137篇
眼科学   75篇
药学   131篇
  1篇
肿瘤学   222篇
  2021年   23篇
  2019年   20篇
  2018年   29篇
  2017年   25篇
  2016年   23篇
  2015年   28篇
  2014年   64篇
  2013年   52篇
  2012年   70篇
  2011年   63篇
  2010年   58篇
  2009年   45篇
  2008年   70篇
  2007年   105篇
  2006年   77篇
  2005年   101篇
  2004年   64篇
  2003年   68篇
  2002年   64篇
  2001年   65篇
  2000年   79篇
  1999年   59篇
  1998年   70篇
  1997年   73篇
  1996年   73篇
  1995年   54篇
  1994年   39篇
  1993年   46篇
  1992年   55篇
  1991年   58篇
  1990年   69篇
  1989年   70篇
  1988年   82篇
  1987年   75篇
  1986年   50篇
  1985年   63篇
  1984年   45篇
  1983年   46篇
  1982年   34篇
  1981年   22篇
  1980年   26篇
  1979年   30篇
  1978年   20篇
  1977年   26篇
  1976年   23篇
  1975年   25篇
  1974年   22篇
  1973年   32篇
  1971年   27篇
  1969年   19篇
排序方式: 共有2661条查询结果,搜索用时 15 毫秒
1.
2.
3.
4.

Background  

Shoulder disorders are a common health problem in western societies. Several treatment protocols have been developed for the clinical management of persons with shoulder pain. However available evidence does not support any protocol as being superior over others. Systematic reviews provide some evidence that certain physical therapy interventions (i.e. supervised exercises and mobilisation) are effective in particular shoulder disorders (i.e. rotator cuff disorders, mixed shoulder disorders and adhesive capsulitis), but there is an ongoing need for high quality trials of physical therapy interventions. Usually, physical therapy consists of active exercises intended to strengthen the shoulder muscles as stabilizers of the glenohumeral joint or perform mobilisations to improve restricted mobility of the glenohumeral or adjacent joints (shoulder girdle). It is generally accepted that a-traumatic shoulder problems are the result of impingement of the subacromial structures, such as the bursa or rotator cuff tendons. Myofascial trigger points (MTrPs) in shoulder muscles may also lead to a complex of symptoms that are often seen in patients diagnosed with subacromial impingement or rotator cuff tendinopathy. Little is known about the treatment of MTrPs in patients with shoulder disorders.  相似文献   
5.
In January 1989, the Johannesburg City Health Department developed an AIDS education poster. The poster was adapted from a cartoon in the Sowetan newspaper and was formally evaluated before its final production. As a result of this evaluation further editing and restructuring of the poster proved necessary. The methodology used in the evaluation is outlined, and some of the findings that emerged during the evaluation are discussed, since few formal evaluations of health education material seem to have been documented in South Africa. This study highlights the importance of formative evaluation of printed health educational media by a sample of the target audience before production and distribution.  相似文献   
6.
7.
8.
Renal uptake of Tl-201 reflects renal perfusion and may have a role in defining renal asymmetry in patients with hypertension who are referred for myocardial scintigraphy. The authors compared two methods of quantitating differential renal uptake of Tl-201, with similar data obtained from the angiographic and renal uptake (RU) phases of Tc-99m DTPA scintigraphy in 35 patients with hypertension. For Tl-201, asymmetry in renal counts was quantitated based on a simple outline technique or on interpolative background subtraction of 5-minute posterior images. Inter-observer and intra-observer variability among duplicate measurements were lower for Tl-201, particularly with interpolative background subtraction, than for Tc-99m DTPA. Renal/background ratios were similar for Tl-201 and RU-phase Tc-99m DTPA images when considering liver, spleen, or inter-renal regions as background; however, paraspinal uptake was relatively higher with Tl-201 (P less than 0.01). Qualitatively, renal asymmetry scores with the two radiotracers agreed (r = 0.89, blinded readings by four observers), although asymmetry was more marked with Tl-201 (P = 0.06). Measurements with Tl-201 agreed with both phases of Tc-99m DTPA (r = 0.96 to 0.98), but interpolative background subtraction systematically yielded greater inter-renal asymmetry than RU (P less than 0.01), reflecting the qualitative impression. Thus, ancillary Tl-201 imaging reflects differences between the kidneys in a fashion similar but not identical to Tc-99m DTPA scintigraphy.  相似文献   
9.
Education for and the practice of Clinical Pharmacy in South Africa have been neglected. This paper describes one attempt to improve matters. An initial survey of pharmacies, pharmacists and other staff in a small group of private hospitals determined the level of Clinical Pharmacy organization and services. The results were used to design a Clinical Pharmacy (training) Programme for selected pharmacists in the group. The programme consisted of six units, each of which was presented in at least a full-day session, with strong audiovisual support, small group discussion and rigorous exercises. During and after each session, implementation and application in the respective hospitals were monitored, as were participants' reactions. Clinical Pharmacy services increased markedly as a result of the programme, as did job satisfaction and motivation among most of the participating pharmacists.  相似文献   
10.
Regional cerebral blood flow was studied in 7 patients with clinically suspected Alzheimer's disease and 10 normal controls by single photon computed emission tomography (SPECT) using HM-PAO. All patients with Alzheimer's disease and no controls had parietal lobe hypoperfusion which was usually bilateral. In patients with more severe dementia hypoperfusion extended into the frontal lobes. Parietal lobe hypoperfusion corresponds to parietal lobe degeneration which is the one of the first neocortical regions to show the typical degenerative changes of Alzheimer's disease. SPECT with HM-PAO is a non-invasive investigation available in most nuclear medicine departments and complements existing tests in the routine evaluation of patients presenting with dementia.  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