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   43056篇
  免费   3383篇
  国内免费   106篇
耳鼻咽喉   666篇
儿科学   1589篇
妇产科学   1289篇
基础医学   5678篇
口腔科学   1007篇
临床医学   4112篇
内科学   9775篇
皮肤病学   870篇
神经病学   4233篇
特种医学   1463篇
外国民族医学   4篇
外科学   5901篇
综合类   649篇
一般理论   54篇
预防医学   3287篇
眼科学   839篇
药学   2338篇
中国医学   17篇
肿瘤学   2774篇
  2022年   410篇
  2021年   959篇
  2020年   543篇
  2019年   843篇
  2018年   959篇
  2017年   695篇
  2016年   750篇
  2015年   894篇
  2014年   1234篇
  2013年   1593篇
  2012年   2274篇
  2011年   2402篇
  2010年   1325篇
  2009年   1089篇
  2008年   1966篇
  2007年   2020篇
  2006年   1994篇
  2005年   1842篇
  2004年   1732篇
  2003年   1600篇
  2002年   1600篇
  2001年   1154篇
  2000年   1206篇
  1999年   1030篇
  1998年   422篇
  1997年   355篇
  1996年   360篇
  1995年   327篇
  1994年   318篇
  1993年   347篇
  1992年   900篇
  1991年   838篇
  1990年   708篇
  1989年   758篇
  1988年   697篇
  1987年   721篇
  1986年   663篇
  1985年   691篇
  1984年   563篇
  1983年   481篇
  1982年   322篇
  1980年   278篇
  1979年   466篇
  1978年   320篇
  1977年   274篇
  1976年   294篇
  1975年   283篇
  1974年   310篇
  1973年   306篇
  1972年   274篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
91.
The cognitive status of 12 clinically stable children with congenital HIV infection, nine of whom were neurologically impaired, age three to nine years, was assessed using the Kaufman ABC test. Seven of the children had ARC; five were diagnosed as having AIDS. The same children were evaluated by standard neurologic examinations with Characterization of tone and fine motor functioning. Two were diagnosed as being mildly retarded; six were borderline; and four tested as being of average intelligence. Visual-spatial perceptual based functioning was found to be more impaired than were abstract reasoning and verbally mediated skills in six (50%) of the patients. This pattern of impaired information processing was found irrespective of overall cognitive status. On neurological and physiatric examination abnormal developmental histories were obtained, or poor fine motor coordination, abnormal tone and gait, and impaired rapidly alternating movements were found in 9 of the 12 subjects. These findings suggest selective impairment in distinct areas of neurologic and neuropsychological functioning during stable phases of HIV infection in a select group of children. These patterns appear to persist over time. They differ from the clustering of impaired skills seen in children of comparable socio-cultural backgrounds without HIV infection. Similarities in functioning are noted between this subgroup of children with AIDS and ARC and comparable groups with cerebral palsy.  相似文献   
92.
Identifying alcoholism in medical patients   总被引:1,自引:0,他引:1  
  相似文献   
93.
94.
It has been suggested that the incidence of childhood empyema have increased during the last years in France without clear explanation. Streptococcus pneumoniae is responsible for the vast majority of bacteriological documented cases. Potential prevention of pleural empyemas by the heptavalent pneumococcal conjugate vaccine is dependent on adequation between specific pneumococcal serogroups present in vaccine and those responsible for empyemas. MATERIAL AND METHODS: We retrospectively collected cases of pleural empyemas registered at the National Reference Center for pneumococci (December 2002 to February 2004). Thirty children, aged 4.1+/-3.3 (SD) years, were included. RESULTS: Ten specific serogroups were identified: 1, 3, 5, 6B, 7F, 9V, 14, 18C, 19A, and 23F. Serogroups 19A and 1 were the 2 dominant serogroups and represented 50% of cases. All children infected with serotype 19A were younger than 5 years, whereas serotype 1 was identified in 80% of empyemas in children older than 5 years. Among the 30 patients enrolled, 20 (69%) were infected with serotypes not included in the conjugate vaccine. CONCLUSION: These results thus limit the potential impact of the heptavalent pneumococcal conjugate vaccine on the frequency of pleural empyemas in children.  相似文献   
95.
As an essential element of the comprehensive rehabilitation efforts at Northport VA Medical Center, and as a service whose demand is projected to increase substantially with the expanding proportion of aging veterans, eye/vision care has become increasingly important. As a result, the administration of the Medical Center decided to heed the suggestions of Congress and the Director of Optometry in VA Central Office and reorganize the delivery of eye/vision services so the ever-increasing demand could be met more rationally, efficiently and effectively. In this paper, the Northport VA Medical Center's Comprehensive Eye/Vision Program, including the residency program in rehabilitative optometry, will be described and the benefits of the reorganization will be discussed.  相似文献   
96.
Cardiac contusion following blunt chest trauma remains a diagnostic problem because of a lack of sensitive diagnostic tests. This study evaluated thallous chloride Tl 201 single-photon-emission computed tomography in a series of 48 patients following blunt chest trauma. Of the 48 patients, 23 had normal scans. None of these patients proved to have serious arrhythmias during three days of continuous monitoring. Of 25 patients with abnormal or ambiguous studies, five (20%) developed serious arrhythmias requiring therapy. Single-photon-emission computed tomography scanning thus was sensitive in indicating that group of patients at risk of serious arrhythmias, and may therefore prove to be a useful screening test to determine the need for hospitalization and arrhythmia monitoring following blunt chest trauma.  相似文献   
97.
Physicians integrating CAM therapies into clinical practice face many legal challenges, including the fact that legal rules governing CAM providers and practices are new and evolving in many cases. Laws vary by state, and their application depends on the specific clinical scenario in question. As more evidence accumulates regarding safety and efficacy or lack thereof of specific therapies for given conditions, physicians will find clinical knowledge more abundantly mapped and that the parameters of liability are increasingly clear. Meanwhile, good clinical practice and a working knowledge of major legal rules can help provide physicians with a good measure of legal protection in situations involving integration of CAM providers and therapies in conventional medical practice.  相似文献   
98.
Long-term effects of cochlear implants in children.   总被引:5,自引:0,他引:5  
OBJECTIVE: Since 1987, when the use of multichannel cochlear implants was initiated in children, candidacy has expanded; many thousands of children have received these devices, and results have revealed a wide range of performance. However, few long-term studies exist on a large population of these children. There have been concerns expressed that cochlear implant function might degrade over time, that devices and electrodes might migrate and extrude in the growing child, or that there might even be a deleterious effect of long-term stimulation of the cochlear nerve. The purpose of this study was to explore the long-term effects of implantation as a function of performance over time, reimplantation, and educational factors. STUDY DESIGN AND SETTING: We studied 81 children who received implants at a major academic medical center and were followed for 5 to 13 years. RESULTS: Results revealed significant gains in speech perception, use of oral language, and ability to function in a mainstream environment. There was no decrease in performance over time and no significant incidence of device or electrode migration or extrusion, and device failure did not cause a deterioration in long-term outcome. CONCLUSIONS: Multichannel cochlear implants in children provide perception, linguistic, and educational advantages, which are not adversely affected by long-term electrical stimulation.  相似文献   
99.
100.
We present a case of rapid failure of a total hip arthroplasty caused by infection with Haemophilus parainfluenzae. The septic loosening occurred over a period of 3 months and followed a dental extraction that had not been covered by prophylactic antibiotics. This failure occurred in a previously well-functioning and asymptomatic prosthetic joint.  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