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   4278篇
  免费   260篇
  国内免费   16篇
耳鼻咽喉   53篇
儿科学   400篇
妇产科学   82篇
基础医学   499篇
口腔科学   58篇
临床医学   261篇
内科学   919篇
皮肤病学   66篇
神经病学   208篇
特种医学   68篇
外科学   411篇
综合类   246篇
一般理论   4篇
预防医学   388篇
眼科学   139篇
药学   389篇
中国医学   25篇
肿瘤学   338篇
  2023年   22篇
  2022年   55篇
  2021年   149篇
  2020年   106篇
  2019年   118篇
  2018年   132篇
  2017年   87篇
  2016年   130篇
  2015年   110篇
  2014年   187篇
  2013年   249篇
  2012年   341篇
  2011年   337篇
  2010年   188篇
  2009年   144篇
  2008年   220篇
  2007年   230篇
  2006年   228篇
  2005年   175篇
  2004年   135篇
  2003年   132篇
  2002年   116篇
  2001年   89篇
  2000年   76篇
  1999年   43篇
  1998年   37篇
  1997年   20篇
  1996年   15篇
  1992年   50篇
  1991年   52篇
  1990年   44篇
  1989年   42篇
  1988年   35篇
  1987年   35篇
  1986年   26篇
  1985年   22篇
  1984年   14篇
  1983年   11篇
  1979年   30篇
  1978年   15篇
  1977年   21篇
  1976年   12篇
  1975年   13篇
  1974年   19篇
  1973年   22篇
  1972年   21篇
  1971年   13篇
  1970年   25篇
  1969年   18篇
  1968年   12篇
排序方式: 共有4554条查询结果,搜索用时 15 毫秒
1.
2.
3.
4.
Sixty drinking water samples collected from various sources in different areas of Delhi during epidemic of cholera and gastroenteritis were analysed for bacteriological standards. Only 27 (45 per cent) samples were found to be satisfactory for human consumption. Remaining thirty-three (55 per cent) samples showed presence of coliform organisms with MPN value ranging from 10 to 1800+ per 100 ml. Among these positive samples, 31 (93.9 per cent) samples contained faecal coli. Twenty out of thirty (66.6 per cent) Hand pump, 9 out of 21 (42.8 per cent) Taps 2 out of 4 (50 per cent) Tube well and 2 out of 5 (40 per cent) of miscellaneous sources showed contamination with coliform organisms.  相似文献   
5.
Awareness among the general population of the risk factors and warning symptoms of stroke is essential for preventative purposes and for immediate effective treatment. The aim of the present study was to assess the awareness, among the general population and stroke survivors, of the risk factors and warning symptoms of stroke, to develop an educational strategy for its prevention and immediate effective treatment. Six hundred and sixty stroke patients (370 male, 290 female) and 4000 people from the general population who accompanied the patients (2800 male, 1200 female) were interviewed, using three sets of questionnaires, on the risk factors and warning symptoms of stroke. Poor knowledge or awareness of the risk factors and warning symptoms of stroke was found in both groups. Both groups suggested educational programs for stroke using printed information, audiovisual programs and community survey programs using simple and understandable information for the prevention and immediate effective treatment of stroke. Poor awareness of stroke contributes to a delay in the arrival of patients in hospital emergency departments for immediate effective treatment. Multifaceted programs regarding stroke, including printed information, audiovisual programs and stroke service programs, are advocated by both patients and the general population to improve stoke treatment and prevention.  相似文献   
6.
A 13-year-old boy who had hemophilia A was reported with pain in the left thigh and hip on walking. He had no history of trauma. Severe hemophilia A is diagnosed with a Factor VIII level of <1 iu/dl. The presumptive diagnosis was that of a spontaneous bleed into the hip joint. Factor VIII mutational analysis revealed a C to G substitution at nucleotide 6683 which results in a cystine change at codon 2194. However, the symptoms persisted and an X-ray demonstrated the presence of an acute on chronic slip of the upper femoral epiphysis. The patient was transferred to the center treating his hemophilia where the hip was pinned in situ under cover with Factor VIII. This case demonstrates the need to be aware of a possible traumatic diagnosis of hip pain in a hemophiliac child with a longstanding history of spontaneous bleeding into joints.  相似文献   
7.
8.
The genotoxic effect of an extract of smoke-dried meat was assayed by employing in vivo sperm head shape abnormality. A significant dose responsive mutagenic effect was observed using the sperm head shape abnormality test. The result indicates that higher doses i.e., 100 and 200 mg/kg body wt. of smoke meat extract, significantly induced sperm head shape abnormality as compared to lower doses i.e., 20 mg/kg body wt. and control.  相似文献   
9.
10.
Observation on serum prolactin in hepatic cirrhosis.   总被引:1,自引:0,他引:1  
Serum prolactin assays in patients of hepatic cirrhosis were analysed. Patients with cirrhosis had higher values of serum prolactin (27.2 +/- 5.1 ng/ml in males and 38.4 +/- 4.1 ng/ml in females) as compared to control subjects (p less than 0.05). Majority of patients of cirrhosis with suspected portal-systemic encephalopathy had significantly higher serum prolactin than those without encephalopathy (p less than 0.05). Significantly higher values of serum prolactin on admission had positive correlation with mortality (p less than 0.01). Clinico-biochemical severity of hepatic dysfunction was directly correlated with level of serum prolactin. The present study reveals the possibility of diagnostic and prognostic values of serum prolactin in cirrhosis, specially in clinical/sub-clinical subsets of portal-systemic encephalopathy.  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