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   2579271篇
  免费   209437篇
  国内免费   7702篇
耳鼻咽喉   34539篇
儿科学   84892篇
妇产科学   72171篇
基础医学   360431篇
口腔科学   74596篇
临床医学   231235篇
内科学   513094篇
皮肤病学   58517篇
神经病学   211387篇
特种医学   104343篇
外国民族医学   720篇
外科学   395969篇
综合类   63519篇
现状与发展   5篇
一般理论   912篇
预防医学   205367篇
眼科学   57415篇
药学   187872篇
  8篇
中国医学   4591篇
肿瘤学   134827篇
  2018年   25046篇
  2016年   22789篇
  2015年   26005篇
  2014年   36143篇
  2013年   54744篇
  2012年   70205篇
  2011年   74740篇
  2010年   45546篇
  2009年   43915篇
  2008年   70792篇
  2007年   75100篇
  2006年   76621篇
  2005年   74283篇
  2004年   72169篇
  2003年   69661篇
  2002年   67149篇
  2001年   120170篇
  2000年   123861篇
  1999年   104339篇
  1998年   30390篇
  1997年   27467篇
  1996年   28107篇
  1995年   27826篇
  1994年   26141篇
  1993年   24568篇
  1992年   86967篇
  1991年   84740篇
  1990年   82060篇
  1989年   78973篇
  1988年   73467篇
  1987年   72350篇
  1986年   68524篇
  1985年   66249篇
  1984年   50213篇
  1983年   42791篇
  1982年   26054篇
  1981年   23412篇
  1980年   22064篇
  1979年   46895篇
  1978年   33310篇
  1977年   28184篇
  1976年   26222篇
  1975年   27649篇
  1974年   33298篇
  1973年   32009篇
  1972年   29480篇
  1971年   27568篇
  1970年   25302篇
  1969年   23770篇
  1968年   21860篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
91.
92.
INTRODUCTION: Autoimmune hepatitis (AIH) is a well-defined entity in the West but there are sparse Indian data on this disease. AIM: To study the clinical profile and response to treatment of Indian patients with AIH. METHODS: This is a part retrospective and part prospective study of 50 patients (median age 48 years, range 11-82; 43 women) seen between 1995 to 2001, diagnosed to have AIH as per the revised scoring system. Clinical and laboratory profile, response to treatment, and complications of treatment were analyzed. RESULTS: AIH accounted for 6% of all patients with liver disease seen during the period. The presenting symptoms were gastrointestinal in 43 and non-gastrointestinal in 7, with median symptom duration of 6 months (range 2 weeks to 40 years). Forty patients (80%) had chronic liver disease. Associated illnesses were present in 28 patients. Twenty-six patients were classified as definite and the rest as probable AIH. Forty-nine patients had Type 1 AIH. Five patients had overlap syndrome. Forty-five patients (90%) received immunosuppressive therapy. Twelve of 18 patients receiving only prednisolone and 21 of 27 patients receiving prednisolone and azathioprine combination responded. Thirteen (26%) patients had therapy-related complications (infectious 5, non infectious 8) with two treatment-related deaths. CONCLUSION: Type 1 AIH was the predominant type of AIH. The majority of patients with AIH presented with chronic liver disease. There was good response to immunosuppressive therapy. Therapy-related complications occurred in one-fourth of patients.  相似文献   
93.
94.
95.
The aim of the present study was to explore differences in the clinical expression, clinical diagnoses and management of airway diseases in a primary-care setting. Patients aged >or=35 yrs who had ever smoked were enrolled when they presented for any reason to one of eight rural primary-care practices. Respiratory symptom questionnaires and spirometry were administered. In total, 1,034 patients had acceptable and reproducible spirometry, of whom 550 (53%) were males and 484 (47%) were females. Males smoked more than females (41.2 versus 29.2 pack-yrs) respectively, and were more likely to have a pre-bronchodilator forced expiratory volume in one second/forced vital capacity <0.70 at 22.4 versus 11.8%, respectively. However, more females than males reported breathlessness (51.0 versus 42.8%, respectively), a prior diagnosis compatible with airflow obstruction and taking respiratory medications (23.4 versus 14.9%, respectively). In conclusion, the current results suggest that females are more likely than males to report breathlessness and be prescribed respiratory medications independent of differences in the severity of airflow obstruction.  相似文献   
96.
97.
98.
99.
Clinicopathological and electron microscopical findings of eight cases of enzootic nasal adenocarcinoma of sheep, diagnosed solely in one big flock in Slovenia between years 2001 and 2003 are described. All affected sheep were female, their mean age was 4.5 ± 1.5 years and they either belonged to the Istrian pramenka breed (five sheep) or were crossbreeds (three sheep). Tumours that arose from the ethmoid area of the nasal cavity were unilateral in six cases (75%) and bilateral in two cases (25%). All tumours were classified as adenocarcinomas by histopathological examination and they displayed either a combination of tubular and papillary growth or less often solely tubular proliferation. No metastases were detected in regional lymph nodes, brain or other organs. Electron microscopical studies performed on the reprocessed paraffin‐embedded tissues revealed the presence of the virus‐like particles with an average diameter between 70 and 90 nm.  相似文献   
100.
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