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   324704篇
  免费   9327篇
  国内免费   183篇
耳鼻咽喉   3447篇
儿科学   11759篇
妇产科学   6551篇
基础医学   39438篇
口腔科学   6186篇
临床医学   24945篇
内科学   58405篇
皮肤病学   4968篇
神经病学   31914篇
特种医学   14819篇
外科学   50552篇
综合类   3017篇
一般理论   65篇
预防医学   26913篇
眼科学   5973篇
药学   19561篇
中国医学   859篇
肿瘤学   24842篇
  2023年   935篇
  2022年   719篇
  2021年   1832篇
  2020年   1544篇
  2019年   1996篇
  2018年   24949篇
  2017年   19843篇
  2016年   22740篇
  2015年   4260篇
  2014年   4590篇
  2013年   7211篇
  2012年   15171篇
  2011年   29691篇
  2010年   23638篇
  2009年   14846篇
  2008年   28125篇
  2007年   30556篇
  2006年   9676篇
  2005年   11154篇
  2004年   11727篇
  2003年   12736篇
  2002年   10646篇
  2001年   5639篇
  2000年   7170篇
  1999年   3961篇
  1998年   1819篇
  1997年   1543篇
  1996年   1138篇
  1995年   994篇
  1994年   955篇
  1993年   878篇
  1992年   814篇
  1991年   757篇
  1990年   760篇
  1989年   736篇
  1988年   596篇
  1987年   660篇
  1986年   551篇
  1985年   787篇
  1984年   735篇
  1983年   623篇
  1982年   694篇
  1981年   613篇
  1980年   607篇
  1979年   530篇
  1978年   490篇
  1977年   512篇
  1976年   444篇
  1975年   447篇
  1974年   441篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
911.
CASE REPORT: The reported female patient underwent sub-total resection of an intra-medullary cervicothoracic astrocytoma classified as WHO grade II in 1984 at the age of 18 months and received local irradiation. In 1989, a local recurrence was diagnosed and a partial resection was performed. Sixteen years later, a small recurrent cervicothoracic tumour was found and spinal seeding to the equine nerve roots and the left cerebellar cortex was apparent on MRI. The patient was implanted with a ventriculoperitoneal shunt for a pseudo-tumour cerebri producing papilloedema, which eventually lead to amaurosis. After an extended biopsy, the invasive lumbosacral tumour was classified as glioblastoma multiforme. Two months later, the patient died after rapid progression of the caudal cranial nerve dysfunction. DISCUSSION AND CONCLUSION: Anaplastic progression and dissemination of spinal astrocytomas even two decades after initial diagnosis and treatment are rare. Therapies and diagnostic follow-up strategies are discussed.  相似文献   
912.
913.
914.

Objective:   

The aim of the present study was to characterise traumatic deaths occurring in the emergency room (ER) and to assess retrospectively the quality of given emergency care by evaluating whether any of the deaths could be identified as potentially preventable.  相似文献   
915.
Over 800 Maine residents will be diagnosed with colorectal cancer (CRC) this year, and nearly 300 will die from the disease. While CRC screening can reduce these rates, it is only among insured populations that screening rates exceed 50%. This project aimed to reduce barriers to, and increase rates of CRC screening among underinsured and uninsured women, ages 50 years and over, residing in Cumberland County, Maine. The existing network of the Maine Breast and Cervical Health Program (MBCHP) was used to reach the target population. A packet containing (1) an offer for no-cost fecal occult blood test (FOBT) screening and CRC-related educational materials, and (2) a stamped, addressed postcard specifying the woman’s interest in these resources, was mailed to 300 MBCHP enrollees residing in Cumberland County. Women requesting screening were contacted by phone to further determine eligibility. Ninety-three women (31%) requested FOBT kits and 29 of these women requested educational materials. Ten women were ineligible for screening because of previous colonoscopy. Fifty-two completed FOBT kits (63%) were returned; all were negative. An additional 42 (14%) women requested educational materials only. To reduce the burden of CRC in Maine and nationally, disparate populations must be reached with efficient and effective screening services. Established networks are proven means for reaching uninsured and underinsured individuals with education, screening services, and necessary follow-up care. This project serves as a model for the future development of similar programs statewide and nationally.  相似文献   
916.
Corporations have engaged in sponsorship of health management programs and, more recently, disease management programs to facilitate healthy and productive work environments. The purpose of this review is to examine the health and financial outcomes from these corporate-sponsored disease management programs. This article focuses on seven diseases or chronic conditions (arthritis, asthma, cancer, depression, diabetes mellitus, heart disease, and migraine) that potentially impact employee productivity (both in time away from work and in loss of effectiveness at work) and health status including medical and pharmaceutical utilization and costs.Corporate-sponsored disease management programs typically focus on education and screening for selected diseases or chronic conditions. Partnerships have been formed with health plans and third-party program providers to reach employees with interventions and treatment. The typical outcome measures from these programs have primarily been clinical indicators and medical utilization. Measures of productivity need to be incorporated as important outcome measures for disease management programs.The estimated financial opportunity for the corporation is a reflection of the cost differential for a given disease and the prevalence of that disease within the employee population. Primary diseases, chronic conditions, and health risks contribute to increased medical utilization and decreased productivity within the corporation. Promoting programs that focus on the whole person, including health risks, chronic conditions, and diseases, will likely increase the possibility of success in helping the employee to better self-manage their health conditions and consequently provide gains for both the individual and the corporation.  相似文献   
917.
918.

Objective  

To observe and evaluate the value of utilizing selective internal iliac artery infusion and selective internal iliac artery embolization for the treatment of unremitting gross hematuria of stage T4 bladder carcinoma.  相似文献   
919.
The aim of this study was to determine the types nosocomial infections (NIs) and the risk factors for NIs in the central intensive care unit (ICU) of Trakya University Hospital. The patients admitted to the ICU were observed prospectively by the unit-directed active surveillance method based on patient and the laboratory over a 9-month-period. The samples of urine, blood, sputum or tracheal aspirate were taken from the patients on the first and the third days of their hospitalization in ICU; the patients were cultured routinely. Other samples were taken and cultured if there was suspicion of an infection. Infections were considered as ICU-associated if they developed after 48 hours of hospitalization in the unit and 5 days after discharge from the unit if the patients had been sent to a different ward in the hospital. The rate of NIs in 135 patients assigned was found to be 68%. The most common infection sites were lower respiratory tract, urinary tract, bloodstream, catheter site and surgical wound. Hospitalization in ICU for more than 6 days and colonization was found to be the main risk factor for NIs. Prolonged mechanical ventilation and tracheostomy, as well as frequently changed nasogastric catheterization, were found to be risk factors for lower respiratory tract infections. For bloodstream infections, both prolonged insertion of and frequent change of arterial catheters, and for urinary tract infections, female gender, period and repeating of urinary catheterization were risk factors. A high prevalence rate of nosocomial infections was found in this study. Invasive device use and duration of use continue to greatly influence the development of nosocomial infection in ICU. Important factors to prevent nosocomial infections are to avoid long hospitalization and unnecessary device application. Control and prevention strategies based on continuing education of healthcare workers will decrease the nosocomial infections in the intensive care unit.  相似文献   
920.
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