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   5704篇
  免费   520篇
  国内免费   63篇
耳鼻咽喉   17篇
儿科学   66篇
妇产科学   52篇
基础医学   245篇
口腔科学   104篇
临床医学   537篇
内科学   696篇
皮肤病学   67篇
神经病学   247篇
特种医学   100篇
外科学   519篇
综合类   1256篇
一般理论   2篇
预防医学   1528篇
眼科学   103篇
药学   433篇
  24篇
中国医学   231篇
肿瘤学   60篇
  2024年   14篇
  2023年   108篇
  2022年   181篇
  2021年   249篇
  2020年   255篇
  2019年   400篇
  2018年   280篇
  2017年   207篇
  2016年   139篇
  2015年   153篇
  2014年   389篇
  2013年   362篇
  2012年   333篇
  2011年   394篇
  2010年   254篇
  2009年   209篇
  2008年   239篇
  2007年   221篇
  2006年   184篇
  2005年   159篇
  2004年   103篇
  2003年   82篇
  2002年   70篇
  2001年   63篇
  2000年   65篇
  1999年   47篇
  1998年   37篇
  1997年   28篇
  1996年   12篇
  1995年   8篇
  1994年   10篇
  1993年   5篇
  1992年   7篇
  1991年   5篇
  1990年   4篇
  1988年   4篇
  1987年   3篇
  1985年   77篇
  1984年   104篇
  1983年   92篇
  1982年   93篇
  1981年   104篇
  1980年   76篇
  1979年   82篇
  1978年   81篇
  1977年   52篇
  1976年   60篇
  1975年   66篇
  1974年   54篇
  1973年   58篇
排序方式: 共有6287条查询结果,搜索用时 15 毫秒
61.
Wearne MJ  Beigi B  Davis G  Rose GE 《Ophthalmology》1999,106(12):2325-8; discussion 2328-9

Objective

Retrograde intubation of canaliculi during dacryocystorhinostomy can restore canalicular patency in cases otherwise managed with bypass tubes. The surgical technique and success for this procedure are discussed.

Design

A retrospective, noncomparative case series with clinic or telephone interview for long-term follow-up of patients’ symptoms.

Participants

One hundred two patients who had undergone this particular lacrimal drainage surgery at Moorfields Eye Hospital between 1992 and 1997.

Intervention

All patients underwent a dacryocystorhinostomy and retrograde canaliculostomy while under general anesthetic.

Main outcome measures

Relief or reduction of epiphora and discharge.

Results

One hundred twenty-three lacrimal systems of 102 patients were included. There were 53 females and 49 males, with ages at surgery ranging from 6 to 83 years (mean, 49 years). The etiology was idiopathic (30%), herpetic canaliculitis (24%), punctal agenesis (18%), and trauma (11%); less-common causes included dacryocystitis, Stevens-Johnson syndrome, eczema, and prior radiation therapy. Both upper and lower canalicular systems were involved in the majority (73%) of patients, and in 13 (11%) systems a dacryocystorhinostomy had previously been performed. The silicone tube was placed for a mean of 2 months (range, 1 week–9 months), and the mean postoperative follow-up was 8 months (range, 2–24 months). Epiphora subjectively improved in 90 (73%) of 123 systems, of which 27 (22%) of 123 were asymptomatic. In 33 systems (27%) in which epiphora persisted, 14 (11%) have undergone closed placement of a Jones canalicular bypass tube with control of symptoms.

Conclusions

Retrograde canaliculostomy and intubation can spare a significant number of patients the long-term inconvenience of Jones tubes. Failure of this technique does not, however, compromise or complicate the future placement of a bypass tube.  相似文献   
62.
BACKGROUND: To describe the ultrasound biomicroscopic (UBM) features of anterior segment cysts. DESIGN: A retrospective case series. PARTICIPANTS: One hundred eighteen eyes with anterior segment cysts examined by UBM at The New York Eye and Ear Infirmary between August 1992 and November 1997 were included in this study. INTERVENTION: The authors reviewed demographic and diagnostic data from the medical record including ocular and medical history, age, race, gender, and intraocular pressure. Ultrasound data concerning the type, number, position, and acoustic characteristics of cysts were recorded. The authors then correlated the written, clinical, and UBM characteristics. RESULTS: One hundred eyes (92.6%) had neuroepithelial cysts. Ninety (83.3%) of these had primary neuroepithelial cysts, 10 (9.3%) had cysts associated with uveitis, 7 (6.5%) had implantation cysts, and 1 (0.9%) had a cavitated ciliary body tumor. Neuroepithelial cysts typically were round or ovoid, thin-walled, and echolucent. Of the 90 eyes with primary neuroepithelial cysts, 56 (62.2%) had 3 or fewer cysts; multiple cysts (>3 per eye) were found in 34 eyes (37.8%). The multiple cysts occupied more than 180 degrees in 12 patients (13.3%). Primary neuroepithelial cysts were located at the iridociliary junction (74.2%), pars plicata (14.0%), pars plana (6.8%), and iris (5.0%). Implantation cysts (seven eyes) tended to have thicker walls and two contained a copious, echogenic material. CONCLUSION: The UBM results provide important information regarding location and extent of anterior segment cystic lesions. Ultrasound characteristics may help differentiate between neuroepithelial, implantation, and neoplastic cysts.  相似文献   
63.
Neutropenia, fever, and infection   总被引:5,自引:0,他引:5  
With the advances in the management of various neoplastic diseases and subsequent improvement in "disease-free" states, complications of therapy--particularly, infectious complications--have evolved as stumbling blocks to survival. Among neutropenic (absolute neutrophil count below 1,000/mm3) patients with cancer, infection is the major autopsy-determined cause of death. With expected "cure rates" of childhood leukemia approaching 60 to 70 percent, it seems unreasonable to lose such patients to an infectious cause of death, yet this, indeed, happens. The purpose of this review is to (1) define the magnitude of the problem; (2) describe the various agents responsible for infections in neutropenic patients; (3) attempt to more sharply define degrees of neutropenia and mechanical defenses; and (4) consider various approaches to studying and treating these infections.  相似文献   
64.
65.
38所综合医院病种质量管理调查分析   总被引:7,自引:1,他引:7  
搜集整理吉林省 38所二、三级综合医院为期一年的 31个病种3.4万份病例的信息资料,对其治疗转归、平均住院日和平均住院费用进行了统计分析,为制定病种质量控制标准和深入广泛开展病种质量管理提供了可靠依据。  相似文献   
66.
从药品的特殊属性谈医药企业的服务营销   总被引:5,自引:0,他引:5  
曹燕  姜卫  吴世玉  陈世全 《中国药房》2005,16(5):331-333
目的 :探讨我国医药企业在市场竞争日益激烈的现状下的服务营销策略选择。方法 :分析处方药品和非处方药品的服务特性 ,并介绍药品市场营销的新观念———服务营销的发展及应用。结果与结论 :医药企业的服务营销应针对处方药品走服务的差异化、有形化、规范化道路 ;针对非处方药品走服务的标准化、技巧化、品牌化道路。  相似文献   
67.
参合农民对新农合定点医疗机构服务质量的评价   总被引:7,自引:4,他引:7  
目的现场调查参合农民对新农合定点医疗机构服务质量的评价情况,为有关卫生主管部门改进新农合定点医疗机构服务质量提供科学依据.方法随机整群抽样,以问卷方式调查抽取的部分云南省寻甸县参合农民对新农合定点医疗机构服务质量的意见和建议.结果参合农民对各级定点医疗机构医疗技术水平、服务态度、收费、卫生资源配置情况的评价分布差异分别都有统计学意义(P<0.001).经非条件Logistic回归分析表明,村卫生室虽然设备较差,只有部分需要的药,但医务人员治疗一些常见病的医疗技术水平尚可,距离近,收费低,可信度和满意程度较高,参合农民选择就诊的可能性相应较高.结论各级定点医疗机构服务质量一般,卫生资源配置不合理,县级医疗机构服务态度较差,收费过高.建议有关卫生主管部门大力提高乡村医生的医技水平,合理配置卫生资源,改善县级医疗机构的服务态度,降低并统一新农合定点医疗机构的收费.  相似文献   
68.
我院在确立了研究型医院的定位后,采取了一系列的科研改革举措,如重新整合科研力量,发展重点学科,加大对科研的投入,设立院所青年科研启动基金,强调人才建设,加强科研管理工作等,这些举措对促进原始创新,增强我院核心竞争力将起到重要作用,从而使我院发展成国内最大、国际知名的心脏病研究中心。  相似文献   
69.
This article estimates the population prevalence of current injection drug users (IDUs) in 96 large US metropolitan areas to facilitate structural analyses of its predictors and sequelae and assesses the extent to which drug abuse treatment and human immunodeficiency virus (HIV) counseling and testing are made available to drug injectors in each metropolitan area. We estimated the total number of current IDUs in the United States and then allocated the large metropolitan area total among large metropolitan areas using four different multiplier methods. Mean values were used as best estimates, and their validity and limitations were assessed. Prevalence of drug injectors per 10,000 population varied from 19 to 173 (median 60; interquartile range 42–87). Proportions of drug injectors in treatment varied from 1.0% to 39.3% (median 8.6%); and the ratio of HIV counseling and testing events to the estimated number of IDUs varied from 0.013 to 0.285 (median 0.082). Despite limitations in the accuracy of these estimates, they can be used for structural analyses of the correlates and predictors of the population density of drug injectors in metropolitan areas and for assessing the extent of service delivery to drug injectors. Although service provision levels varied considerably, few if any metropolitan areas seemed to be providing adequate levels of services.  相似文献   
70.
目的了解公共场所服务业人员对艾滋病及其传播途径的认知情况。方法2005年9月,采用匿名自填式问卷调查方法,调查深圳市公共场所服务业人员的一般人口社会学特征,对艾滋病的认知情况及影响因素进行分析。结果服务业人员对艾滋病知识有一定的了解,对其主要传播途径有较好的掌握,但在非传播途径的了解方面仍存在一些模糊认识。对安全套的预防作用认识不足。多数愿意接受艾滋病的健康检查。结论应进一步加强公共场所服务业人员的艾滋病教育,使其对艾滋病基本知识有一个全面的了解。推广使用安全套。同时加强预防艾滋病措施的宣传,出台相关的政策。  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