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   21499篇
  免费   1710篇
  国内免费   86篇
耳鼻咽喉   314篇
儿科学   595篇
妇产科学   465篇
基础医学   3017篇
口腔科学   445篇
临床医学   2001篇
内科学   5024篇
皮肤病学   239篇
神经病学   2014篇
特种医学   650篇
外科学   3410篇
综合类   331篇
一般理论   16篇
预防医学   1633篇
眼科学   582篇
药学   1177篇
中国医学   44篇
肿瘤学   1338篇
  2023年   187篇
  2022年   394篇
  2021年   782篇
  2020年   408篇
  2019年   615篇
  2018年   743篇
  2017年   485篇
  2016年   500篇
  2015年   615篇
  2014年   791篇
  2013年   1043篇
  2012年   1506篇
  2011年   1535篇
  2010年   838篇
  2009年   712篇
  2008年   1256篇
  2007年   1244篇
  2006年   1226篇
  2005年   1158篇
  2004年   1067篇
  2003年   936篇
  2002年   925篇
  2001年   155篇
  2000年   139篇
  1999年   172篇
  1998年   181篇
  1997年   166篇
  1996年   139篇
  1995年   129篇
  1994年   118篇
  1993年   115篇
  1992年   107篇
  1991年   102篇
  1990年   110篇
  1989年   92篇
  1988年   106篇
  1987年   113篇
  1986年   76篇
  1985年   105篇
  1984年   106篇
  1983年   101篇
  1982年   135篇
  1981年   125篇
  1980年   164篇
  1979年   77篇
  1978年   87篇
  1977年   79篇
  1976年   84篇
  1975年   63篇
  1974年   71篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
11.
12.

Background  

There are few effective strategies reported for the primary prevention of low back pain (LBP). Core stabilization exercises targeting the deep abdominal and trunk musculature and psychosocial education programs addressing patient beliefs and coping styles represent the current best evidence for secondary prevention of low back pain. However, these programs have not been widely tested to determine if they are effective at preventing the primary onset and/or severity of LBP. The purpose of this cluster randomized clinical trial is to determine if a combined core stabilization exercise and education program is effective in preventing the onset and/or severity of LBP. The effect of the combined program will be compared to three other standard programs.  相似文献   
13.
The purpose of the present study was to evaluate the haemostatic efficacy of fibrin sealant in patients with hereditary haemorrhagic telangiectasia (HHT) or Rendu-Osler-Weber disease suffering epistaxis. A retrospective observational study of patients with HHT who were admitted to an emergency room for anterior or posterior epistaxis during May 2000-March 2003. A total of 24 patients were evaluated, of whom 15 were managed with foam nasal packing during May 2000-March 2002 and another nine were treated during March 2002-March 2003 with 0.3 ml fibrin sealant spray (Quixil; Omrix, Belgium). The immediate and the distant results were compared. Immediate haemostasis was achieved in all seven patients treated with fibrin glue, with good healing of bleeding sites, no secondary bleeding, no inflammation, and no plaque or crists. Twelve months of follow-up monitoring (until October 2003) of atrophic changes of nasal mucosa, bleeding frequency and intensity proved absence of atrophy of nasal mucosa and decreased bleeding frequency. In this group, the bleeding episode duration averaged 2 min 35 s since the moment of admittance. In the nasal packing group, we found local swelling, pain, and slow healing of the bleeding site with accidental atrophy of nasal mucosa and no effect on further bleeding frequency and intensity. Removal of nasal packing frequently initiates secondary bleeding. The rates of these side effects were higher in comparison with the fibrin glue group. The bleeding episode duration was also longer. In patients with HHT suffering profuse epistaxis, fibrin glue is more effective and convenient for the patients as compared with foam nasal packing. It is also safer, since it lacks the complications that usually accompany packing as swelling, atrophy of the nasal mucosa, and secondary bleeding provoked by the removal of the pack.  相似文献   
14.
15.
16.
It's all about sex: gender, lung development and lung disease.   总被引:1,自引:0,他引:1  
Accumulating evidence suggests that gender affects the incidence, susceptibility and severity of several lung diseases. Gender also influences lung development and physiology. Data from both human and animal studies indicate that sex hormones might contribute to disease pathogenesis or serve as protective factors, depending on the disease involved. In this review, the influence of gender and sex hormones on lung development and pathology will be discussed, with specific emphasis on pulmonary fibrosis, asthma and cancer.  相似文献   
17.
18.
Hyper-IgM syndrome with CHARGE association   总被引:1,自引:0,他引:1  
A girl with coloboma of the iris, sensorineural deafness, growth delay, distinctive face, and cranial nerve dysfunction was diagnosed of CHARGE association in the first year of life. She presented with repeated otitis. At 3 yr of age, the patient suffered a septicemia ( Streptococcus pneumoniae , Corynebacterium sp.). The immunoglobulin G (IgG) and IgA serum levels were decreased, IgM increased and cellular immunity parameters were normal, supporting the diagnosis of hyper-IgM (HIM) syndrome. The sequence of CD40 ligand and cytidine deaminase genes were normal. From then on, she was receiving immunoglobulin intravenously with an excellent outcome . Here, we report the first case of CHARGE association and HIM syndrome in the same patient. Although the cause could not be identified, a non-random link is likely.  相似文献   
19.
20.
Approximately one quarter of a series of 45 schizophrenic and schizoaffective patients with operationally diagnosed episodes of postpsychotic depression were also found to have anxiety symptoms consistent with the panic-attack syndrome. The incidence of such attacks was distributed across all demographic groups. Heuristic and treatment implications of this observation are considered.  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