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   1891209篇
  免费   135795篇
  国内免费   4227篇
耳鼻咽喉   24515篇
儿科学   61721篇
妇产科学   50749篇
基础医学   269571篇
口腔科学   53155篇
临床医学   167245篇
内科学   376055篇
皮肤病学   43981篇
神经病学   149076篇
特种医学   69833篇
外国民族医学   331篇
外科学   282642篇
综合类   39794篇
现状与发展   4篇
一般理论   590篇
预防医学   142383篇
眼科学   44097篇
药学   137820篇
  7篇
中国医学   5031篇
肿瘤学   112631篇
  2021年   15705篇
  2019年   16725篇
  2018年   26019篇
  2017年   19239篇
  2016年   20665篇
  2015年   23459篇
  2014年   30971篇
  2013年   45688篇
  2012年   66327篇
  2011年   68922篇
  2010年   39472篇
  2009年   35778篇
  2008年   63238篇
  2007年   67300篇
  2006年   66968篇
  2005年   64104篇
  2004年   61617篇
  2003年   58190篇
  2002年   55962篇
  2001年   96370篇
  2000年   98279篇
  1999年   81143篇
  1998年   20511篇
  1997年   17967篇
  1996年   18053篇
  1995年   17379篇
  1994年   15852篇
  1993年   14581篇
  1992年   59951篇
  1991年   57629篇
  1990年   55189篇
  1989年   52834篇
  1988年   48185篇
  1987年   46897篇
  1986年   44019篇
  1985年   41651篇
  1984年   30612篇
  1983年   25972篇
  1982年   14609篇
  1979年   26668篇
  1978年   18400篇
  1977年   15681篇
  1976年   14520篇
  1975年   15361篇
  1974年   18592篇
  1973年   17896篇
  1972年   16536篇
  1971年   15326篇
  1970年   14232篇
  1969年   13368篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
51.
52.
Acne vulgaris (acne) is a chronic inflammatory disease of the sebaceous gland, characterized by follicular hyperkeratinization, excessive colonization by Propionibacterium acnes (Pacnes) as well as immune reactions and inflammation. Despite an armamentarium of topical treatments available including benzoyl peroxide, retinoids and azelaic acid, topical antibiotics in monotherapies, especially erythromycin and clindamycin, are still used in Europe to treat acne. This intensive use led to antimicrobial‐resistant P. acnes and staphylococci strains becoming one of the main health issues worldwide. This is an update on the current topical acne treatments available in Europe, their mechanism of action, their potential to induce antimicrobial resistance and their clinical efficacy and safety.  相似文献   
53.
54.
We report on a child with several café au lait spots in association with a lumbar lipomeningomyelocele as an apparently new association. Cutaneous markers, the identification of which plays a crucial role in the early diagnosis and management of spinal malformations, can accompany occult spinal dysraphism. Herein we report a case of lumbar lipomeningomyelocele associated with an overlying café au lait spot that served as a marker of occult spinal dysraphism. The patient also had segmental café au lait spots on the face, making the association unique.  相似文献   
55.
56.
Dosage form is a mean used for the delivery of drug to a living body. In order to get the desired effect the drug should be delivered to its site of action at such rate and concentration to achieve the maximum therapeutic effect and minimum adverse effect. Since oral route is still widely accepted route but having a common drawback of difficulty in swallowing of tablets and capsules. Therefore a lot of research has been done on novel drug delivery systems. This review is about oral dispersible tablets a novel approach in drug delivery systems that are now a day''s more focused in formulation world, and laid a new path that, helped the patients to build their compliance level with the therapy, also reduced the cost and ease the administration especially in case of pediatrics and geriatrics. Quick absorption, rapid onset of action and reduction in drug loss properties are the basic advantages of this dosage form.  相似文献   
57.
Sinus venosus atrial septal defect (SV‐ASD) usually coexists with partial anomalous pulmonary vein connection (PAPVC). It is a difficult diagnosis in transthoracic echocardiography (TTE) due to eccentric position of defects. We present a rare case of atypical anatomical variation in PAPVC, which was never described before. Two right pulmonary veins drained into superior vena cava, which overrode SV‐ASD and interatrial septum, a third pulmonary vein into the right atrium. Complete diagnosis could not be set after TTE, nor transesophageal echocardiography, whereas angio‐CT was finally conclusive. This diagnostic approach allowed the surgical planning.  相似文献   
58.
59.
60.
In the current immunosuppressive therapy era, vessel thrombosis is the most common cause of early graft loss after renal transplantation. The prevalence of IgA anti–β2-glycoprotein I antibodies (IgA-aB2GPI-ab) in patients on dialysis is elevated (>30%), and these antibodies correlate with mortality and cardiovascular morbidity. To evaluate the effect of IgA-aB2GPI-ab in patients with transplants, we followed all patients transplanted from 2000 to 2002 in the Hospital 12 de Octubre prospectively for 10 years. Presence of IgA-aB2GPI-ab in pretransplant serum was examined retrospectively. Of 269 patients, 89 patients were positive for IgA-aB2GPI-ab (33%; group 1), and the remaining patients were negative (67%; group 2). Graft loss at 6 months post-transplant was significantly higher in group 1 (10 of 89 versus 3 of 180 patients in group 2; P=0.002). The most frequent cause of graft loss was thrombosis of the vessels, which was observed only in group 1 (8 of 10 versus 0 of 3 patients in group 2; P=0.04). Multivariate analysis showed that the presence of IgA-aB2GPI-ab was an independent risk factor for early graft loss (P=0.04) and delayed graft function (P=0.04). There were no significant differences regarding patient survival between the two groups. Graft survival was similar in both groups after 6 months. In conclusion, patients with pretransplant IgA-aB2GPI-ab have a high risk of early graft loss caused by thrombosis and a high risk of delayed graft function. Therefore, pretransplant IgA-aB2GPI-ab may have a detrimental effect on early clinical outcomes after renal transplantation.  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