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   1368841篇
  免费   100318篇
  国内免费   1994篇
耳鼻咽喉   19133篇
儿科学   47495篇
妇产科学   36371篇
基础医学   193338篇
口腔科学   34126篇
临床医学   116904篇
内科学   276805篇
皮肤病学   28435篇
神经病学   109692篇
特种医学   55364篇
外国民族医学   660篇
外科学   212226篇
综合类   27781篇
现状与发展   1篇
一般理论   378篇
预防医学   104070篇
眼科学   28806篇
药学   99688篇
  2篇
中国医学   2430篇
肿瘤学   77448篇
  2018年   23739篇
  2017年   18515篇
  2016年   21134篇
  2015年   12748篇
  2014年   17473篇
  2013年   26522篇
  2012年   38957篇
  2011年   47483篇
  2010年   30342篇
  2009年   27341篇
  2008年   46359篇
  2007年   51243篇
  2006年   39787篇
  2005年   40488篇
  2004年   40063篇
  2003年   40054篇
  2002年   38263篇
  2001年   64330篇
  2000年   67022篇
  1999年   56638篇
  1998年   15327篇
  1997年   14011篇
  1996年   14336篇
  1995年   13614篇
  1994年   12947篇
  1993年   11935篇
  1992年   44677篇
  1991年   43620篇
  1990年   42360篇
  1989年   40236篇
  1988年   37000篇
  1987年   36378篇
  1986年   33725篇
  1985年   32387篇
  1984年   24200篇
  1983年   20338篇
  1982年   11811篇
  1981年   10710篇
  1980年   9619篇
  1979年   21443篇
  1978年   14889篇
  1977年   12553篇
  1976年   11763篇
  1975年   12632篇
  1974年   14696篇
  1973年   14130篇
  1972年   12950篇
  1971年   11737篇
  1970年   11083篇
  1969年   10061篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
91.
92.
Background: Dense deposit disease and atypical hemolytic uremic syndrome are often caused by Complement Factor H (CFH) mutations. This study describes the retinal abnormalities in dense deposit disease and, for the first time, atypical haemolytic uremic syndrome. It also reviews our understanding of drusen pathogenesis and their relevance for glomerular disease. Methods: Six individuals with dense deposit disease and one with atypical haemolytic uremic syndrome were studied from 2 to 40 years after presentation. Five had renal transplants. All four who had genetic testing had CFH mutations. Individuals underwent ophthalmological review and retinal photography, and in some cases, optical coherence tomography, and further tests of retinal function. Results: All subjects with dense deposit disease had impaired night vision and retinal drusen or whitish-yellow deposits. Retinal atrophy, pigmentation, and hemorrhage were common. In late disease, peripheral vision was restricted, central vision was distorted, and there were scotoma from sub-retinal choroidal neovascular membranes and atypical serous retinopathy. Drusen were present but less prominent in the young person with atypical uremic syndrome due to a heterozygous CFH mutation. Conclusions: Drusen are common in forms of C3 glomerulopathy caused by compound heterozygous or heterozygous CFH mutations. They are useful diagnostically but also impair vision. Drusen have an identical composition to glomerular deposits. They are also identical to the drusen of age-related macular degeneration, and may respond to the same treatments. Individuals with a C3 glomerulopathy should be assessed ophthalmologically at diagnosis, and monitored regularly for vision-threatening complications.  相似文献   
93.
Obtaining accurate assessment data from adolescents in treatment aids clinical decision making and facilitates more accurate outcome evaluations. However, findings could be biased due to underreported substance use and mental health symptoms. This article compares self-reports of youth in non-White matched client–assessor dyads and those in nonmatched dyads. There were no differences on self-reported substance use, but matched youth reported significantly fewer attention deficit/hyperactivity disorder symptoms versus the comparison group. One possible reason for these findings is the effect of in-group stereotype threat. Future studies should examine the potential effect that in-group stereotyping and perceived racism have on the therapeutic relationship.  相似文献   
94.
95.
96.
97.
While peer support has been investigated in multiple clinical contexts, its application to the postpartum setting is unknown. The aim was to assess acceptability of a postpartum peer support program for women with diabetes. Observational survey-based needs assessment of forty low-income women with diabetes, receiving care at a major medical institution. Mean age and gravidity were 30.7 years and 3.15 ± 1.67 respectively. 45 % expressed interest in a “buddy.” There was no significant difference between groups desiring and not desiring this program. A majority of respondents desired telephone, text messaging, and in-person contacts (79.2, 72.1, 83.8 %), with 72.5 % of patients desiring diabetes-related activities during clinic waiting time. Many women desire a postpartum diabetes reciprocal peer program for support outside of clinician visits. Patients are receptive to educational services during their wait and outside of clinic time, a potentially valuable opportunity to share important health information.  相似文献   
98.
99.
100.
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