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   2601篇
  免费   116篇
  国内免费   9篇
耳鼻咽喉   18篇
儿科学   475篇
妇产科学   43篇
基础医学   230篇
口腔科学   21篇
临床医学   153篇
内科学   497篇
皮肤病学   66篇
神经病学   109篇
特种医学   72篇
外科学   440篇
综合类   151篇
预防医学   83篇
眼科学   47篇
药学   135篇
中国医学   6篇
肿瘤学   180篇
  2023年   16篇
  2022年   18篇
  2021年   39篇
  2020年   23篇
  2019年   35篇
  2018年   69篇
  2017年   31篇
  2016年   68篇
  2015年   46篇
  2014年   81篇
  2013年   100篇
  2012年   174篇
  2011年   149篇
  2010年   123篇
  2009年   77篇
  2008年   142篇
  2007年   137篇
  2006年   119篇
  2005年   101篇
  2004年   88篇
  2003年   104篇
  2002年   101篇
  2001年   83篇
  2000年   83篇
  1999年   69篇
  1998年   38篇
  1997年   22篇
  1996年   26篇
  1995年   16篇
  1994年   29篇
  1993年   9篇
  1992年   49篇
  1991年   51篇
  1990年   32篇
  1989年   31篇
  1988年   27篇
  1987年   28篇
  1986年   28篇
  1985年   31篇
  1984年   21篇
  1983年   13篇
  1981年   23篇
  1980年   9篇
  1979年   17篇
  1978年   18篇
  1977年   25篇
  1976年   26篇
  1975年   11篇
  1974年   11篇
  1968年   8篇
排序方式: 共有2726条查询结果,搜索用时 15 毫秒
1.
2.
3.
4.
Semen analysis was performed on 48 men who had undergone orchiopexy, 40 for unilateral impalpable testes and 8 for bilateral impalpable testes. Patients with unilateral impalpable testes had varying sperm analysis; 18 (86%) of the 23 patients with unilateral impalpable canalicular testes had normal sperm analysis. All patients with bilateral impalpable testes were azoospermic. The subsequent quality of the semen is dependent upon the original anatomical positions of the undescended testes.  相似文献   
5.
Malignant schwannoma (malignant peripheral nerve sheath tumour, MPNST) is a rare high-grade tumour arising from peripheral nerves. We report the case of a 3-year-old male who presented with a non-tender lesion on the dorsum of his penis. The lesion was excised and a formal circumcision performed. Histology of the lesion revealed a spindle cell tumour. Immunohistochemistry showed the tumour cells to be strongly positive for S100 and Vimentin. A diagnosis of intermediate grade malignant peripheral nerve sheath tumour was made. Malignant schwannoma is rare in children and is previously unreported in the penis in the paediatric age group without evidence of neurofibromatosis.  相似文献   
6.
7.
In most Special Care Neonatal Units (SCNUs) in India, mothers are excluded from the care of their sick babies for fear of over-crowding and dislocation. We have attempted to study the feasibility of involving mothers in the care of their babies admitted for neonatal septicemia and to analyse whether this changed the sepsis related case fatality rate. The study material consisted of 158 neonates with blood culture positive neonatal septicemia whose mothers were actively involved in their care during their stay in the SCNU of LNJPN Hospital throughout 1987-88. The mothers lived in with their sick neonates and were extremely useful in feeding, cleaning, and monitoring for some important signs and symptoms. There were no epidemics of infection in the nursery during this period. All the babies discharged were receiving breast feeds, and the mothers were confident in taking care of them before discharge. The mortality in this group was 43%. The onset of septicemia was most often in the first week (36%) being 25.9% in second week, 26.6% in the third, and 11.4% in the fourth. Mortality was maximum (64.5%) when the onset of illness was in the first 3 days. Klebsiella and S. aureus were commonly isolated organisms (38.6 and 21.5%, respectively). Gram negative organisms were isolated in 66.5% cases with higher mortality in this group. Nearly 46% of the babies weighed 2 kg or less, with a mortality of 60.2% compared to 28.2% in those more than 2 kg. Only 3 to 5% and 40 to 66.7% of Gram negative and 23 and 70% of Gram positive organisms were sensitive to ampicillin and gentamicin, respectively.  相似文献   
8.
9.
A 32-year-old male presented with progressive weakness and numbness of both upper limbs of one-month duration. The patient had weakness and wasting of small muscles of both hands with weak grip. Sensory system revealed graded sensory loss to pain, temperature and touch in C5 to T1 distribution and vibration and joint position sense from C5 to C8 in the both upper limbs. There was areflexia in the upper limbs while there was no motor or sensory deficit in the lower limbs. The cortical potential on stimulation of posterior tibial nerve was prolonged on both sides. On MR imaging of the cervical spine there was iso to low intense lesion which was hyperintense on T2-weighted imaging along the dorsal aspect of the cord extending from C2 to C6 level. The axial images showed involvement of the posterior column. The serum vitamin B12 level was found to be low. The patient responded to parenteral cyanocobalamine therapy and the radiological lesion subsequently resolved.  相似文献   
10.
Erratum     
Prem Puri 《Diabetologia》1992,35(6):594-594
  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