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   3083篇
  免费   149篇
  国内免费   7篇
耳鼻咽喉   29篇
儿科学   256篇
妇产科学   102篇
基础医学   424篇
口腔科学   65篇
临床医学   249篇
内科学   544篇
皮肤病学   94篇
神经病学   105篇
特种医学   50篇
外科学   398篇
综合类   65篇
一般理论   5篇
预防医学   179篇
眼科学   178篇
药学   223篇
中国医学   16篇
肿瘤学   257篇
  2024年   1篇
  2023年   20篇
  2022年   39篇
  2021年   83篇
  2020年   64篇
  2019年   93篇
  2018年   105篇
  2017年   59篇
  2016年   81篇
  2015年   86篇
  2014年   163篇
  2013年   187篇
  2012年   255篇
  2011年   324篇
  2010年   188篇
  2009年   119篇
  2008年   180篇
  2007年   221篇
  2006年   166篇
  2005年   151篇
  2004年   170篇
  2003年   133篇
  2002年   138篇
  2001年   39篇
  2000年   28篇
  1999年   19篇
  1998年   18篇
  1997年   16篇
  1996年   10篇
  1995年   7篇
  1994年   5篇
  1993年   6篇
  1992年   7篇
  1991年   9篇
  1990年   5篇
  1989年   5篇
  1988年   8篇
  1987年   10篇
  1986年   3篇
  1985年   4篇
  1984年   6篇
  1982年   1篇
  1981年   1篇
  1980年   1篇
  1977年   1篇
  1973年   1篇
  1972年   3篇
排序方式: 共有3239条查询结果,搜索用时 15 毫秒
991.
992.
A 3-month-old infant presented with unilateral proptosis. Ophthalmic and physical examinations, computed tomography, and histopathologic examination of a biopsy specimen were performed. Histopathologic examination confirmed fungal orbital cellulitis. The patient responded to 6 weeks of antifungal therapy. Fungal orbital cellulitis should be included in the differential diagnosis for infants with proptosis.  相似文献   
993.
994.
Cardiac retransplantation is often the only therapy to treat GV or other causes of allograft failure. Previous reports of retransplantation have conflicting results. In this series of 18 re-transplants in 16 patients from 1984-2005, indications for retransplantation were: GV (67%); GV with cellular rejection (28%); acute graft failure (2.5%); and chronic graft failure (2.5%). Mean age at retransplantation was 12.3 (range: 0.7-22) years with a mean primary graft survival of 5.3 years (range: 8 days-10.5 years). There was no short-term mortality with only three deaths at 4, 10, and 16 years post-retransplantation. Fourteen of 18 patients had risk factors for adverse outcomes following retransplantation: ECMO support in one patient prior to retransplantation; impaired renal function in three patients; elevated panel reactive antibody screen in seven patients; a history of PTLD in five patients; and a recent episode of rejection (13-36 days) in four patients. One-, five- and ten-year survival after retransplantation was 100%, 83% and 66%, respectively, comparable to survival after primary transplantation. Freedom from rejection was not significantly different between primary and retransplantations. All patients who underwent treatment for PTLD had excellent results after retransplantation with one recurrence 16 months after retransplant. Overall, patients had excellent survival after retransplantation even in those with risk factors for poor outcome.  相似文献   
995.
996.
997.
BACKGROUND: The extent of association of human papilloma virus (HPV) in human conjunctival neoplasias has been debated in studies originating from different parts of the world, but no substantial evidence has been generated on Indian subjects. This prompted us to carry out a retrospective study on conjunctival neoplasias diagnosed over the past 12 years. MATERIALS AND METHODS: Histopathological and immunohistochemical analysis of 65 specimens of ocular neoplasias and 30 normal controls diagnosed between 1991 and 2002 at a tertiary eye care hospital, was undertaken. Formalin-fixed, paraffin-embedded tissues were reviewed for confirming histopathological diagnosis, presence of koilocytosis and changes related to actinic keratosis. Immunohistochemical analysis was done using HPV-specific monoclonal antibodies. Clinicopathological correlation and the association of HPV antigen with the histopathological features were performed. RESULTS: Out of the 65 cases analyzed, 35 were papillomas and 30 were ocular surface squamous neoplasias (OSSN). The mean age was 48 years with a male preponderance. Histologically, koilocytosis was observed in 17.1% of papillomas and 36.6% of OSSN. Actinic keratosis was present in 33% of OSSN. Immunohistochemically 17.1% conjunctival papillomas stained positive for HPV antigen, all cases of OSSN were negative for HPV. There was no correlation between koilocytosis or actinic keratosis and the detection of HPV antigen. CONCLUSIONS: The association between HPV and conjunctival neoplasias is variable in different geographical areas and also depends on the methods of detection used. This study warrants the need for applying more advanced techniques at a molecular level to determine the possible etiology of HPV in conjunctival neoplasias among Asian-Indians.  相似文献   
998.
Imiquimod, an immune response modifier, is known to possess both anti-viral and anti-tumor effect. We report our experience of treating a large superficial spreading basal cell carcinoma with 5% imiquimod cream. A 65-year-old male had an asymptomatic, hyperpigmented, slowly progressive, indurated, 3 x 4 cm plaque on the left cheek for two months. Biopsy from the lesion showed features of basal cell carcinoma. The patient was treated with imiquimod 5% cream, topically three times a week for six months with complete resolution of the lesion and without any side-effects. There was no clinical or histological recurrence after three months of stopping the treatment.  相似文献   
999.
Twelve children with pancreatic pseudocysts were managed for over 10 years at our institute that is a tertiary referral center of our country. A majority of them had posttraumatic pancreatic pseudocysts. Six of them were early referrals and presented within 1–2 weeks of pancreatic injury while the remaining six were referred later than 6 weeks with thick cyst walls. An initial conservative management and observation (with serial ultrasounds) led to a resolution of the pseudocysts in three patients (25% resolution rate). All the remaining subjects were treated using surgical modality (cystogastrostomy). In all the subjects where cystogastrostomy was done, the pseudocysts resolved completely, except in one child, who required the procedure to be repeated. The authors encountered no complications of the pancreatic pseudocyst disease in children i.e. infection, rupture, etc, that have been frequently described for adults. The authors conclude that pancreatic pseudocyst is a comparatively benign entity in children with a better outcome than in adults. Though various sophisticated treatment modalities are in vogue in the developed countries for managing pancreatic pseudocysts in children, cystogastrostomy is still a valid option for this purpose in the developing countries with suboptimal infrastructure and gives good results.  相似文献   
1000.
Persistent interstitial pulmonary emphysema (PIPE) is a syndrome characterized by air-leakage in the perivascular tissues of the lung, primarily affecting mechanically ventilated neonates. Reports in the literature of infants developing PIPE with no history of respiratory distress syndrome (RDS) or mechanical ventilation are scarce. Here, we present a case of a 3-month-old former full term male infant with no history of RDS or mechanical ventilation who presented with focal cystic lung disease associated with spontaneous tension pneumothorax. He was ultimately found to have PIPE based on pathologic evaluation of the resected cystic region. We believe that focal PIPE should be included in the differential diagnosis of cystic lung disease in a full term, unventilated infant, even when spontaneous pneumothorax is the presenting entity.  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