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   6288篇
  免费   290篇
  国内免费   24篇
耳鼻咽喉   130篇
儿科学   616篇
妇产科学   97篇
基础医学   702篇
口腔科学   149篇
临床医学   423篇
内科学   1072篇
皮肤病学   103篇
神经病学   337篇
特种医学   182篇
外科学   888篇
综合类   145篇
一般理论   2篇
预防医学   466篇
眼科学   240篇
药学   529篇
中国医学   33篇
肿瘤学   488篇
  2022年   46篇
  2021年   147篇
  2020年   117篇
  2019年   155篇
  2018年   135篇
  2017年   105篇
  2016年   169篇
  2015年   149篇
  2014年   258篇
  2013年   292篇
  2012年   421篇
  2011年   413篇
  2010年   290篇
  2009年   191篇
  2008年   314篇
  2007年   329篇
  2006年   340篇
  2005年   309篇
  2004年   239篇
  2003年   233篇
  2002年   175篇
  2001年   90篇
  2000年   68篇
  1999年   74篇
  1998年   41篇
  1996年   34篇
  1995年   32篇
  1992年   61篇
  1991年   63篇
  1990年   43篇
  1989年   70篇
  1988年   46篇
  1987年   56篇
  1986年   62篇
  1985年   49篇
  1984年   40篇
  1982年   36篇
  1981年   39篇
  1980年   40篇
  1979年   55篇
  1978年   37篇
  1977年   36篇
  1976年   41篇
  1975年   51篇
  1974年   61篇
  1973年   42篇
  1971年   46篇
  1970年   47篇
  1968年   32篇
  1967年   35篇
排序方式: 共有6602条查询结果,搜索用时 15 毫秒
1.

Background

Sewage management is hazardous due to chronic exposure to chemical gases, bioaerosols and micro-organisms through inhalation; accidental oral intake and penetration through skin or mucous membranes through injuries or breech in personal protective equipment. While there has been some research on isolated infections and multisystem symptom profiling of sewage workers, there is little research on the burden of chronic illnesses like Tuberculosis and Non Communicable Diseases (NCDs).

Methods

A cross sectional observational study was conducted on chronic comorbidity profile of sewage workers with more than five years of occupational experience and employed in three contiguous districts of NCT of Delhi.

Results

The study sample consisted of 104 sewage workers with mean age of 50.71 (±8.43) years, an average of 7.35 (±3.75) years of formal education and an average occupational exposure to sewage work of 21.28 (±10.54) years.21.15% sewage workers had Tuberculosis and 92.31% had at least one of the chronic respiratory diseases (COPD, Asthma or ACOS). 85.6% of participants were smokers. The most common NCD was Hypertension (67.3%) followed by Dyslipidaemia (50%) and Diabetes Mellitus (43.3%). There was clustering of NCDs with 53.85% subjects having three or more chronic disorders. Less than 5% of study participants were free from all the investigated chronic diseases.

Conclusion

The sewage workers have an adverse chronic morbidity profile for both Tuberculosis and NCDs. There is an urgent need for epidemiological research and targeted screening and public health intervention for Tuberculosis and other NCDs in sewage workers as an occupational group.  相似文献   
2.
3.
4.
5.
6.
The aim of this study is to review the literature to find out the exact etiology of anastomotic cancers of colon post resection and differentiate them between a recurrence, second primary, and metastatic disease (local manifestation of systemic disease). Web-based literature search was done, and datas collected. We searched PubMed for papers using the keywords colon cancer recurrence, anastomotic recurrence, and recurrent colon carcinoma. We also searched for systematic review in the same topic. In addition, we used our personal referrence archive. Anastomotic recurrences of colon are postulated to arise due to inadequate margins, tumor implantation by exfoliated cells, altered biological properties of bowel anastomosis, and missed synchronous lesions. Some tumors are unique with repeated recurrence after repeated resection. Duration after primary surgery plays a major role in differentiating recurrent and second primary lesions. Repeated recurrences after repeated resections have to be considered a manifestation of systemic disease or metastatic disease due to the virulence of the disease. A detailed analysis and study of patients with colonic anastomotic lesion are required to differentiate it between a recurrent, a second primary lesion, and a metastatic disease (local manifestation of a systemic disease). The nomenclature is significant to study the survival of these patients, as a second primary lesion will have different survival compared to that of recurrent lesions.  相似文献   
7.
Neurodegeneration with brain iron accumulation (NBIA) is the term applied to a heterogeneous group of disorders resulting in iron deposition in the basal ganglia. Well-known phenotypic features are progressive regression with extra pyramidal involvement and a variable course. A 10-year-old child born to consanguineous parents presented with progressive generalized opisthotonic dystonia, retrocollis, oromandibular dyskinesias, apraxia for swallowing, optic atrophy and severe self-mutilation of lips. MR imaging showed brain iron accumulation. Other causes of self-mutilation were excluded. Early infantile onset, ophisthotonic dystonia with oromandibular dyskinesias and characteristic MR images are suggestive of NBIA. There is only one case reported in the literature of self-mutilation in this condition.  相似文献   
8.
9.
10.
PurposeEmergence of vancomycin variable enterococci (VVE) poses a challenge to empiric vancomycin therapy. Vancomycin-variable enterococci (VVE) are vanA-positive, yet phenotypically vancomycin-susceptible enterococci that can switch to a vancomycin-resistant phenotype when exposed to vancomycin. The aim of the present study was to determine the prevalence of VVE in India.MethodsIsolates of phenotypically vancomycin susceptible Enterococcus faecium from 20 tertiary care hospitals across India were collected and tested for the presence of vanA, vanR, vanS, vanB and vanC genes by conventional PCR using previously published primers. Isolates positive for vanA gene were considered as VVE.ResultsThe prevalence of VVE was 1.5% (5/340). Only one VVE isolate was positive for vanR and vanS, and all the isolates were negative for vanB and vanC.ConclusionsAlthough the prevalence is low, our finding emphasizes the importance of routinely screening for van genes in enterococci that are phenotypically susceptible. Silenced vanA able to escape detection and revert to resistance during vancomycin therapy represents a new challenge in clinical settings.  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