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   8043篇
  免费   1063篇
  国内免费   152篇
耳鼻咽喉   19篇
儿科学   416篇
妇产科学   78篇
基础医学   728篇
口腔科学   54篇
临床医学   909篇
内科学   1169篇
皮肤病学   83篇
神经病学   91篇
特种医学   82篇
外科学   753篇
综合类   1222篇
现状与发展   6篇
预防医学   2006篇
眼科学   110篇
药学   743篇
  11篇
中国医学   677篇
肿瘤学   101篇
  2024年   11篇
  2023年   136篇
  2022年   233篇
  2021年   601篇
  2020年   529篇
  2019年   374篇
  2018年   312篇
  2017年   321篇
  2016年   376篇
  2015年   378篇
  2014年   699篇
  2013年   692篇
  2012年   562篇
  2011年   572篇
  2010年   439篇
  2009年   400篇
  2008年   366篇
  2007年   350篇
  2006年   267篇
  2005年   244篇
  2004年   192篇
  2003年   197篇
  2002年   107篇
  2001年   115篇
  2000年   81篇
  1999年   64篇
  1998年   59篇
  1997年   59篇
  1996年   53篇
  1995年   54篇
  1994年   42篇
  1993年   47篇
  1992年   41篇
  1991年   41篇
  1990年   28篇
  1989年   37篇
  1988年   17篇
  1987年   29篇
  1986年   12篇
  1985年   26篇
  1984年   12篇
  1983年   10篇
  1982年   11篇
  1981年   12篇
  1980年   13篇
  1979年   5篇
  1978年   10篇
  1977年   7篇
  1976年   5篇
  1975年   5篇
排序方式: 共有9258条查询结果,搜索用时 296 毫秒
81.
简要梳理了新发重大传染病对医院运营的影响,并从布局及流程管理、应急资源管理、人力资源管理、绩效分配管理、经济管理及信息化建设6个方面提出优化策略,同时从加强传染病基础设施建设、规划传染病救治中心、鼓励一院多区模式、建设应急物资储备库、完善应急资源保障体系、给予医院适当财政支持方面提出政策建议,以期为新发重大传染病背景下医院的运营优化提供参考借鉴。  相似文献   
82.
摘 要:目的:分析手足口病聚集性疫情在人群中的发生情况和分布特征。方法:收集2018年1月—2020年12月苏州 市各市 (区) 疾病预防控制中心每月上报的手足口病聚集性疫情信息,进行描述性统计分析。结果:2018—2020年苏州市共 报告手足口病聚集性疫情1 006起,报告病例3 129例,其中57.06%的疫情涉及2例病例。疫情发生的高峰期为每年的5—6月 和9月;报告疫情起数排在前三位的市 (区) 分别为张家港市、吴中区和太仓市;89.46%的疫情发生在幼托机构。采集342 起疫情的867例标本进行实验室检测,检出阳性病原的326起,占95.32%。阳性疫情以柯萨奇病毒A组6型 (CoxA6) 为主, 其次为柯萨奇病毒 A 组 16 型 (CoxA16)。结论:手足口病聚集性疫情呈现明显的双峰分布,幼托机构是疫情防控的重点场 所,病原存在单一感染和混合感染,不同年份病原构成存在差异。  相似文献   
83.
《Value in health》2022,25(4):566-570
ObjectivesMany trials conclude “no clinically meaningful detriment” to health-related quality of life (HRQL) or function between arms, even when notable differential toxicity is observed. Mean change from baseline analyses of function or HRQL can possibly obscure important change in subgroups experiencing symptomatic toxicity. We evaluate the impact of diarrhea, a key treatment arm toxicity, on patient-reported HRQL and functioning in clinical trials submitted to US Food and Drug Administration.MethodsThis study used 4 randomized, breast cancer trials (adjuvant to late-line metastatic) as case examples. Diarrhea, physical functioning (PF), and global health status and quality of life (GHS/QoL) from the European Organisation for Research and Treatment of Cancer Quality of Life Questionnaire-C30 were analyzed at baseline and approximately 3 and 6 months.ResultsGenerally, patients reporting very much diarrhea at months 3 and 6 had worse PF (9-19 points lower) and GHS/QoL (16-19 points lower) than patients reporting no diarrhea regardless of treatment arm. In the change from baseline analysis, patients reporting very much diarrhea also experienced a greater decrease in PF (6-13 points) and GHS/QoL (6-16 points) versus patients reporting no diarrhea in both arms.ConclusionsIn trials with moderate to large differences in symptomatic toxicity by arm, reporting “no meaningful difference in functioning and HRQL between arms” based on mean change from baseline analysis is insufficient and may obscure important impacts on subgroups experiencing symptomatic adverse events. Additional exploratory analyses with simple data visualizations evaluating functioning or HRQL in patient subgroups experiencing expected symptomatic toxicities can further inform the safety and tolerability of an investigational agent.  相似文献   
84.
Irritable Bowel Syndrome (IBS) is a chronic functional gastrointestinal disorder characterized by abdominal pain associated with defecation or a change in bowel habits. Gut microbiota, which acts as a real organ with well-defined functions, is in a mutualistic relationship with the host, harvesting additional energy and nutrients from the diet and protecting the host from pathogens; specific alterations in its composition seem to play a crucial role in IBS pathophysiology. It is well known that diet can significantly modulate the intestinal microbiota profile but it is less known how different nutritional approach effective in IBS patients, such as the low-FODMAP diet, could be responsible of intestinal microbiota changes, thus influencing the presence of gastrointestinal (GI) symptoms. The aim of this review was to explore the effects of different nutritional protocols (e.g., traditional nutritional advice, low-FODMAP diet, gluten-free diet, etc.) on IBS-D symptoms and on intestinal microbiota variations in both IBS-D patients and healthy subjects. To date, an ideal nutritional protocol does not exist for IBS-D patients but it seems crucial to consider the effect of the different nutritional approaches on the intestinal microbiota composition to better define an efficient strategy to manage this functional disorder.  相似文献   
85.
While poorly-absorbed sugar alcohols such as sorbitol are widely used as sweeteners, they may induce diarrhea in some individuals. However, the factors which determine an individual’s susceptibility to sugar alcohol-induced diarrhea remain unknown. Here, we show that specific gut bacteria are involved in the suppression of sorbitol-induced diarrhea. Based on 16S rDNA analysis, the abundance of Enterobacteriaceae bacteria increased in response to sorbitol consumption. We found that Escherichia coli of the family Enterobacteriaceae degraded sorbitol and suppressed sorbitol-induced diarrhea. Finally, we showed that the metabolism of sorbitol by the E. coli sugar phosphotransferase system helped suppress sorbitol-induced diarrhea. Therefore, gut microbiota prevented sugar alcohol-induced diarrhea by degrading sorbitol in the gut. The identification of the gut bacteria which respond to and degrade sugar alcohols in the intestine has implications for microbiome science, processed food science, and public health.  相似文献   
86.
Modelling and simulation methods can play an important role in guiding public health responses to infectious diseases and emerging health threats by projecting the plausible outcomes of decisions and interventions. The 2003 SARS epidemic marked a new chapter in disease modelling in Canada as it triggered a national discussion on the utility and uptake of modelling research in local and pandemic outbreaks. However, integration and application of model-based outcomes in public health requires knowledge translation and contextualization. We reviewed the history and performance of Pan-InfORM (Pandemic Influenza Outbreak Research Modelling), which created a national infrastructure in Canada with a mandate to develop innovative knowledge translation methodologies to inform policy makers through modelling frameworks that bridge the gaps between theory, policy, and practice. This review demonstrates the importance of a collaborative infrastructure as a “Community of Practice” to guide public health responses, especially in the context of emerging diseases with substantial uncertainty, such as the COVID-19 pandemic. Dedicated resources to modelling and knowledge translation activities can help create synergistic strategies at the global scale and optimize public health responses to protect at-risk populations and quell socioeconomic and health burden.  相似文献   
87.
BackgroundThe greatest risk of infectious disease undernotification occurs in settings with limited capacity to detect it reliably. World Health Organization guidance on the measurement of misreporting is paradoxical, requiring robust, independent systems to assess surveillance rigor. Methods are needed to estimate undernotification in settings with incomplete, flawed, or weak surveillance systems. This study attempted to design a tuberculosis (TB) inventory study that balanced rigor with feasibility for high-need settings.ObjectiveThis study aims to design a hybrid TB inventory study for contexts without World Health Organization preconditions. We estimated the proportion of TB cases that were not reported to the Ministry of Health in 2015. The study sought to describe TB surveillance coverage and quality at different levels of TB care provision. Finally, we aimed to identify structural-, facility-, and provider-level barriers to notification and reasons for underreporting, nonreporting, and overreporting.MethodsRetrospective partial digitalization of paper-based surveillance and facility records preceded deterministic and probabilistic record linkage; a hybrid of health facilities and laboratory census with a stratified sampling of HFs with no capacity to notify leveraged a priori knowledge. Distinct extrapolation methods were applied to the sampled health facilities to estimate bacteriologically confirmed versus clinical TB. In-depth interviews and focus groups were used to identify causal factors responsible for undernotification and test the acceptability of remedies.ResultsThe hybrid approach proved viable and instructive. High-specificity verification of paper-based records in the field was efficient and had minimal errors. Limiting extrapolation to clinical cases improved precision. Probabilistic record linkage is computationally intensive, and the choice of software influences estimates. Record absence, decay, and overestimation of the private sector TB treatment behavior threaten validity, meriting mitigation. Data management demands were underestimated. Treatment success was modest in all sectors (R=37.9%–72.0%) and did not align with treatment success reported by the state (6665/8770, 75.99%). One-fifth of TB providers (36/178, 20%) were doubtful that the low volume of patients with TB treated in their facility merited mastery of the extensive TB notification forms and procedures.ConclusionsSubnational inventory studies can be rigorous, relevant, and efficient in countries that need them even in the absence of World Health Organization preconditions, if precautions are taken. The use of triangulation techniques, with minimal recourse to sampling and extrapolation, and the privileging of practical information needs of local decision makers yield reasonable misreporting estimates and viable policy recommendations.  相似文献   
88.
Ophidiomycosis represents a conservation threat to wild snake populations. The disease was reported in North America early in the 21st century, but the history of ophidiomycosis has not been investigated. We examined museum specimens and confirmed cases of ophidiomycosis >50 years before the disease’s reported emergence.  相似文献   
89.
90.
近年来,人与野生动物日益频繁的接触,再加上病原微生物本身不断的变异和进化,导致新发传染病(emerging infectious diseases,EIDs)的发生呈持续增长态势,暴发频率不断增加,给全球公共卫生带来极大威胁与挑战。在下一次新发传染病暴发之际,希望能通过合理运用相关技术方法准确快速回答“病原体是什么”、“病原体来自哪”两大问题,从而及时有效预警并从源头控制新发传染病的大流行。对当前新发传染病病原体的鉴定技术进行归纳介绍,并探讨各种技术的优劣势以及各自应用领域。  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