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   554篇
  免费   40篇
耳鼻咽喉   4篇
儿科学   7篇
妇产科学   12篇
基础医学   65篇
口腔科学   8篇
临床医学   33篇
内科学   171篇
皮肤病学   10篇
神经病学   90篇
特种医学   8篇
外科学   97篇
预防医学   39篇
眼科学   3篇
药学   19篇
中国医学   2篇
肿瘤学   26篇
  2023年   5篇
  2022年   5篇
  2021年   12篇
  2020年   8篇
  2019年   11篇
  2018年   13篇
  2017年   6篇
  2016年   5篇
  2015年   9篇
  2014年   12篇
  2013年   21篇
  2012年   35篇
  2011年   37篇
  2010年   25篇
  2009年   19篇
  2008年   25篇
  2007年   29篇
  2006年   28篇
  2005年   30篇
  2004年   24篇
  2003年   28篇
  2002年   39篇
  2001年   9篇
  2000年   14篇
  1999年   12篇
  1998年   11篇
  1997年   2篇
  1996年   3篇
  1995年   3篇
  1994年   2篇
  1993年   4篇
  1992年   8篇
  1991年   8篇
  1990年   7篇
  1989年   5篇
  1988年   10篇
  1987年   8篇
  1986年   5篇
  1985年   5篇
  1984年   14篇
  1983年   6篇
  1982年   2篇
  1981年   4篇
  1979年   7篇
  1977年   2篇
  1976年   2篇
  1975年   2篇
  1972年   4篇
  1965年   2篇
  1961年   1篇
排序方式: 共有594条查询结果,搜索用时 15 毫秒
51.
52.
53.
One quarter of all TB cases occur in China, which, during the past 20 years has moved from a planned economy to a socialist market economy. In the health sector, an important proportion of the financing originates from user payment. TB control is not an exception and different programmatic models are in place. This study examines, using a case study approach, three different TB programmes, one supposed to provide free service, one subsidized service and one with full cost recovery. The aim was to better understand the driving forces for programme performance in terms of case detection, case management and patient payments. The study found for all models that control and case management approaches were, to some extent, adapted to generate maximum income to the providers. The drive for income led to fewer cases detected, administration of unnecessary procedures and drugs, and a higher than necessary cost to the patients. The latter possibly leading to exclusion of poor people from the services. If user charges are to stay, TB control programmes need to be designed to take advantage of the financial incentives to improve performance. The referral system needs to be restructured, not to provide disincentives for good practices.  相似文献   
54.
Background and objectivesWe compare the inspiratory and expiratory regional lung densities between different levels of COPD severity (as assessed by the GOLD scale and by the BODE index), and to assess the relationship between regional lung densities and functional lung parameters.Patients and methodsFifty-five stable moderate-severe COPD men were selected. Functional evaluation included dyspnoea scale, blood gases, spirometry, plethysmography, diffusing capacity and six-minute walk test. Severity was classified according the GOLD scale and the BODE index. High resolution computed tomography (HRCT) scans of the entire lung at full inspiration and two sections at full expiration were obtained. Densitometry software was used to calculate the densities of the lung areas.ResultsInspiratory and expiratory mean lung densities (MLD) of the lower lobes were significantly lower in very severe and severe COPD patients than in moderate patients. In contrast, we only found differences between the upper lobe MLD values of moderate and severe COPD patients. Inspiratory and expiratory HRCT densities were similar among all BODE quartiles, for both the upper and lower lobes. In a multiple regression analysis, airway obstruction parameters were mainly related to the expiratory MLD of the lower lobes, whereas lung hyperinflation parameters were predicted by the inspiratory MLD of the lower lobes. Lastly, diffusion capacity was independently related to the expiratory/inspiratory MLD of the lower lobes and to the inspiratory MLD of the upper lobes.ConclusionsThere are differences in lung attenuation measurements by HRCT between the varying levels of COPD severity as assessed by the GOLD scale.  相似文献   
55.
Purpose This review aims to map the scope of published research on occupational therapy (OT) interventions and pertinent work and work-related outcomes for persons with occupational injuries and diseases. Methods The scoping review adapted Arksey and O’Malley’s framework. Six electronic databases were searched. Ancestral search was also done on five systematic reviews. The search was conducted from September 2015 to October 2015. Interventions and outcomes were coded using the International Classification of Functioning, Disability and Health Core Set for Vocational Rehabilitation to plot trends. Results Forty-six articles were included in the review. The top five intervention approaches included: acquiring skills (12.27%), health services, systems, and policies (10.43%), products and technology for employment (9.20%), handling stress and other psychological demands (7.98%), and apprenticeship (6.74%). The top five outcomes targeted included: remunerative employment (15.71%); sensation of pain (10.99%); emotional functions (5.76%); handling stress and other psychological demands (5.76%); economic self-sufficiency (4.71%); muscle endurance functions (4.71%); exercise tolerance functions (4.71%); undertaking multiple tasks (4.19%); acquiring, keeping, and terminating a job (4.19%); and looking after one’s health (4.19%). Conclusion The trend in interventions show the use of activities and environment facilitators which are attuned to the conceptual nature of OT. Furthermore, the trend in outcomes show that there is substantial evidence that supports the use of OT to target work. This review may provide a platform for collaboration with other professionals and also help identify research directions to strengthen the evidence base for OT in work-related practice.  相似文献   
56.

Introduction

The assessment of the Diabetes Mellitus 2 Care Process (PAI-DM2) through the assessment tool for the chronic illness’ care models (IEMAC-Diabetes) allows the design of health interventions for the improvement of medical care.

Objective

Analysing the quality of healthcare provided to DM2 patients.

Design

Quasiexperimental study before and after intervention with a not randomised control group.

Location

Health care district of primary care Sevilla.

Participants

12 groups of ascribed patients, 5 Primary Care Healthcenter, chosen in a discretionary way.

Intervention

Physicians and nurses from the 12 intervention groups took part in a training program, including an external rotation in the Diabetes Daycare Hospital.

Main measurements

Number of included patients, glycated hemoglobin, feet exploration (FE), and ocular fundus (OF).

Results

1,475 DM-2 patients were analysed. The proportion of included patients per group was 8.5%, 45.5% were women. At the beginning of the study, the rate of patients with HbA1c < 7% were 38.9% in 2013 against 47.7% in 2014 and 40.2% in 2016; 33% of the patients had an OF in 2013 against 41.77% in 2014; 51.6% of patients had an EF against 54.7% in 2014. After the intervention, statistically significant differences were reached in HbA1c (p = 0.01) and retinography requested (p = 0.01).

Conclusions

IEMAC-Diabetes allows spotting improvement areas in the PAI-DM2. The absence of statistically significant differences may be the result of contamination in the sample and/or Hawthorne effect.  相似文献   
57.
Based on a medicinal chemistry guided hypothetical pharmacophore model, novel series of indolyl sulfonamides have been designed and prepared as selective and high-affinity serotonin 5-HT(6) receptor ligands. Furthermore, based on a screening approach of a discovery library, a series of benzoxazinepiperidinyl sulfonamides were identified as selective 5-HT(6) ligands. Many of the compounds described in this paper possess excellent affinities, displaying pK(i) values greater than 8 (some even >9) and high selectivities against a wide range (>50) of other CNS relevant receptors. First, structure-affinity relationships of these ligands are discussed. In terms of functionality, high-affinity antagonists, as well as agonists and even partial agonists, were prepared. Compounds 19c and 19g represent the highest-affinity 5-HT(6) agonists ever reported in the literature. These valuable tool compounds should allow for the detailed study of the role of the 5-HT(6) receptor in relevant animal models of disorders such as cognition deficits, depression, anxiety, or obesity.  相似文献   
58.
Amyloidosis and Alzheimer's disease   总被引:8,自引:0,他引:8  
Alzheimer's disease (AD) is the most frequent type of amyloidosis in humans and the commonest form of dementia. Extracellular Abeta amyloid deposits in the form of amyloid plaques and cerebral amyloid angiopathy as well as intraneuronal neurofibrillary tangles co-exist in the brain parenchyma of AD patients, the cognitive areas being the most severely affected. This review focuses on the potential role of amyloid in the development of neurodegeneration and presents studies of AD and other unrelated inherited dementia syndromes associated with neuronal loss and amyloid deposition in the brain.  相似文献   
59.
J Vitorica  D Park  A L de Blas 《Brain research》1990,537(1-2):209-215
The expression of the GABAA/benzodiazepine receptor (GABAR/BZDR) complex in primary neuronal cultures from rat brain embryos has been investigated. The GABAR/BZDR complex was photoaffinity labeled with [3H]flunitrazepam [3H]FNZ and immunoprecipitated with subunit specific antibodies. These were the mAb 62-3G1 which is specific for the 57-kDa GABA binding subunit, and the rabbit antiserum A which recognizes the 51-kDa [3H]FNZ binding subunit. The results indicate that the cultured neurons express 5 different peptides of 51, 53, 54, 57 and 59 kDa that can be photoaffinity labeled with [3H]FNZ and that all of them are physically coupled to the GABAA receptor. Most of the [3H]FNZ photolabeled peptides have similar mobilities to those found in the brain of the newborn rat. Nevertheless, some of the quantitative changes in the photolabeled peptides observed during the normal development of the rat brain were not observed or occurred at much slower pace in the cultured neurons.  相似文献   
60.
The annual incidence of Schistosoma japonicum infection was calculated from the record of the yearly examination among school children of Dagami Area, Leyte, Philippines. Data were processed mainly by the computer. Children were examined for eggs by the merthiolate formalin concentration technique and by the circumoval precipitin test (COPT) once a year in 3 consecutive school years (SY), SY 1974/75, 1975/76 and 1976/77. About 600 to 700 children were examined yearly and the ratios of cases rechecked after 1 year were about 30%. A method to calculate the overall incidence in children who were examined at different intervals, was newly established. The incidence appeared to rise rapidly in the survey period, being 25.59% and 41.30% by fecal examination and 10.74% and 21.27% by COPT in SY 1975/76 and 1976/77, respectively. From the combined results of fecal examination and COPT, the reliable values of incidence, however, were shown to be stable during 2 years such as 22.06% and 24.21%, respectively. The incidence estimated by the age prevalence data was 20.25% in SY 1976/77 by the combined results and was found to be lower than the directly calculated value.  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