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   1188412篇
  免费   85411篇
  国内免费   3814篇
耳鼻咽喉   16928篇
儿科学   30830篇
妇产科学   30659篇
基础医学   170603篇
口腔科学   36281篇
临床医学   102506篇
内科学   233872篇
皮肤病学   25348篇
神经病学   91381篇
特种医学   45713篇
外国民族医学   160篇
外科学   190750篇
综合类   26354篇
现状与发展   2篇
一般理论   286篇
预防医学   74699篇
眼科学   28731篇
药学   93806篇
  4篇
中国医学   3905篇
肿瘤学   74819篇
  2018年   12488篇
  2017年   9711篇
  2016年   10536篇
  2015年   11950篇
  2014年   16440篇
  2013年   23380篇
  2012年   31996篇
  2011年   33161篇
  2010年   19652篇
  2009年   18808篇
  2008年   31732篇
  2007年   33710篇
  2006年   34087篇
  2005年   32388篇
  2004年   31133篇
  2003年   29851篇
  2002年   29126篇
  2001年   72214篇
  2000年   74040篇
  1999年   61452篇
  1998年   14467篇
  1997年   12483篇
  1996年   12161篇
  1995年   11376篇
  1994年   10406篇
  1993年   9598篇
  1992年   45398篇
  1991年   43023篇
  1990年   41345篇
  1989年   40454篇
  1988年   36701篇
  1987年   35733篇
  1986年   33283篇
  1985年   31577篇
  1984年   22295篇
  1983年   18765篇
  1982年   9687篇
  1981年   8337篇
  1979年   19480篇
  1978年   12977篇
  1977年   11171篇
  1976年   9538篇
  1975年   10515篇
  1974年   12705篇
  1973年   11955篇
  1972年   11399篇
  1971年   10887篇
  1970年   10253篇
  1969年   9703篇
  1968年   8849篇
排序方式: 共有10000条查询结果,搜索用时 62 毫秒
151.
FGFR–TACC, found in different tumor types, is characterized by the fusion of a member of fibroblast grown factor receptor (FGFR) tyrosine kinase (TK) family to a member of the transforming acidic coiled-coil (TACC) proteins. Because chromosome numerical alterations, hallmarks of FGFR–TACC fusions are present in many hematological disorders and there are no data on the prevalence, we studied a series of patients with acute myeloid leukemia and myelodysplastic syndrome who presented numerical alterations using cytogenetic traditional analysis. None of the analyzed samples showed FGFR3–TACC3 gene fusion, so screening for this mutation at diagnosis is not recommended.  相似文献   
152.
153.
154.
155.
156.
157.
Purpose/aim: To focus on current aspects of primary thyroid lymphoma (PTL), which is a rare clinical entity usually manifested by a rapidly growing mass in the neck that can cause pressure symptoms.

Materials and Methods: Relevant papers in PubMed published through June 2017 were selected to track updated information about PTL with an emphasis on diagnosis and novel therapeutic management.

Results: The most frequent cases include non-Hodgkin lymphoma derived from B-cells, mainly diffuse large B-cell lymphoma (DLBCL) followed by mucosa-associated lymphoid tissue (MALT) lymphoma or a mixed type. Other subtypes are less common. Lymphomas derived from T-cells and Hodgkin lymphomas are extremely rare. Hashimoto's autoimmune thyroiditis has been implicated as a risk factor for lymphoma. At the molecular level, the Wnt5a protein and its receptor Ror2 are involved in the course of the disease. Ultrasonography, fine needle aspiration (FNA) biopsy, and core or open biopsy combined with new diagnostic facilities contribute to an accurate diagnosis. An increased potential exists for a cure without the need for a radical surgical procedure. Modern chemoradiation therapy plus the monoclonal antibody rituximab, which acts against CD20, have limited the need for surgical interventions and provide an excellent outcome in most cases. However, some cases have resulted in treatment failure or recurrence.

Conclusions: A multidisciplinary approach must be used to define the management policy in each case. Future efforts by researchers are likely to be focused on the molecular level.  相似文献   

158.
159.
BackgroundWomen suffering from kidney disease are more prone to fertility problems, due to uremia. Fortunately, their fertility rate increases dramatically after renal transplantation. This study analyzes the predictors/risk factors of successful pregnancy with live birth outcome while presenting an overview of the 7-year experience of a single center.MethodsThis retrospective cohort study includes 239 women of reproductive age (18–40 years) who underwent renal transplantation in a tertiary Turkish clinic between October 1, 2011, and August 24, 2017. The subjects were invited to take part in a survey questioning their obstetric characteristics and they were assessed in 2 groups: fertile and infertile. Multivariable linear regression analysis was conducted to determine the predictors of a successful pregnancy.ResultsThirty-five 35 patients wished to become pregnant: 12 got pregnant spontaneously, while 21 failed to become pregnant (spontaneously). The mean age of the patients at the survey was 34 ± 7. Regular menstrual cycles after renal transplantation, tacrolimus-mycophenolate mofetil maintenance protocol, and age at transplantation were found to be predictors of spontaneous pregnancy. The duration of peritoneal dialysis was significantly longer in the infertile group (48 vs 12 months).ConclusionEnd-stage renal disease's negative impacts, including menstrual abnormality and fertility problems, can be overcome by successful kidney transplantation with appropriate immunosuppression. Minimizing the duration of peritoneal dialysis, particularly in patients who desire future fertility, may be accepted as a logical management strategy.  相似文献   
160.
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