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   22491篇
  免费   1914篇
  国内免费   1050篇
耳鼻咽喉   213篇
儿科学   270篇
妇产科学   400篇
基础医学   2955篇
口腔科学   338篇
临床医学   2613篇
内科学   4132篇
皮肤病学   510篇
神经病学   1091篇
特种医学   843篇
外国民族医学   5篇
外科学   2957篇
综合类   2247篇
现状与发展   1篇
一般理论   10篇
预防医学   1259篇
眼科学   634篇
药学   2307篇
  15篇
中国医学   830篇
肿瘤学   1825篇
  2024年   37篇
  2023年   241篇
  2022年   504篇
  2021年   952篇
  2020年   632篇
  2019年   683篇
  2018年   700篇
  2017年   646篇
  2016年   688篇
  2015年   1010篇
  2014年   1195篇
  2013年   1207篇
  2012年   1662篇
  2011年   1663篇
  2010年   1208篇
  2009年   1060篇
  2008年   1126篇
  2007年   1138篇
  2006年   1177篇
  2005年   1022篇
  2004年   826篇
  2003年   793篇
  2002年   728篇
  2001年   476篇
  2000年   418篇
  1999年   439篇
  1998年   342篇
  1997年   340篇
  1996年   290篇
  1995年   260篇
  1994年   178篇
  1993年   165篇
  1992年   161篇
  1991年   128篇
  1990年   120篇
  1989年   99篇
  1988年   105篇
  1987年   90篇
  1986年   73篇
  1985年   59篇
  1984年   41篇
  1983年   32篇
  1979年   37篇
  1978年   33篇
  1958年   63篇
  1957年   61篇
  1956年   59篇
  1955年   52篇
  1954年   43篇
  1949年   26篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
ABSTRACT

Purpose

Work-related eye injuries have been reported with a variety of epidemiologic and clinical characteristics. We aimed to identify epidemiologic characteristics of work-related eye injuries and risk factors associated with severe injury in a large metropolitan city.  相似文献   
2.
3.
4.
Lucio phenomenon is an atypical reaction of leprosy, characterized by vasculitic lesions that can mimic antiphospholipid syndrome (APS) clinically. Distinguishing the two can be difficult as antiphospholipid autoantibodies may be present in patients with leprosy. We report on a 32‐year‐old female patient presenting with a sudden onset of fever, hemorrhagic bullae, and skin necrosis on her lower legs. She was treated for APS due to the presence of antiphospholipid antibodies but had an inadequate response. A skin biopsy revealed thrombotic vasculopathy and necrotizing vasculitis associated with aggregation of foam cells in the perivascular area and subcutis, with acid‐fast bacilli in the histiocytes and blood vessel walls. Direct immunofluorescence showed IgM, C3, and fibrinogen deposition in the superficial and deep dermal blood vessels. The pathology confirmed the diagnosis of Lucio phenomenon, and appropriate therapy was given. It is essential to evaluate the patient comprehensively, including clinical, serological, and pathological aspects, to obtain the correct diagnosis.  相似文献   
5.
6.
It has been suggested that tumour‐infiltrating lymphocytes (TILs) are associated with the progression of oral squamous cell carcinoma (OSCC). However, the prognostic value of TILs is inconclusive due to the heterogeneity of immune cells within the tumour microenvironment. In this meta‐analysis, we aimed to assess the prognostic value of TILs in OSCC. The PubMed, Cochrane, Embase, Scopus and Web of Science databases were searched up to April 20, 2019, and 33 studies were ultimately included in this meta‐analysis. Our pooled meta‐analysis showed that high infiltration of CD8+ TILs, CD45RO+ TILs and CD57+ TILs favoured better overall survival (OS). However, high infiltration of CD68+ macrophages and CD163+ macrophages was associated with poor prognosis in OSCC. These findings suggest that CD8+ TILs, CD45RO+ TILs, CD57+ TILs, CD68+ macrophages and CD163+ macrophages might serve as novel prognostic factors and therapeutic targets in OSCC.  相似文献   
7.
Cytogenetic abnormalities are observed in approximately two‐thirds of patients with acute myeloid leukemia (AML). Chromosome rearrangements are associated with specific subtypes of AML and associated prognosis. We report a patient with AML, M2, who was primarily refractory to standard induction chemotherapy with idarubicin and cytarabine. Flow cytometry of a bone marrow aspirate showed aberrant expression of B‐cell markers including CD19. Cytogenetic studies disclosed a translocation between 5q35 and 11q13. Fluorescence in situ hybridization analyses demonstrated that neither the NSD1 nor MLL genes were involved in this case. Further study is required to define conclusively the genes involved and their contribution to pathogenesis in this case.  相似文献   
8.
喘鸣是婴幼儿时期呼吸道疾病中最常见的症状,病因很多,并非所有的喘鸣均由哮喘引起。气管、支气管炎及气管、支气管软骨软弱、异物、血管畸形,胸内肿瘤以及支气管淋巴结核等,均可引起喘鸣。分析天津市儿童医院收治的以喘鸣为主要症状的3岁以下婴幼儿196例,其主要病因见表1。表1天津市儿童医院收治的196例以喘鸣为主要症状的婴幼儿喘鸣病因病因例数大气道阻塞气管、支气管异物21气管、支气管淋巴结核51先天性气管、支气管、肺发育畸形12支气管软骨软化3纵隔囊肿和(或)肿瘤19血管畸形1中叶综合征5小气道阻塞毛细支气管炎30以喘息为表型的婴幼…  相似文献   
9.
通过历时2 a的现场监测,揭示了大面积堆场逐级增高情况下软土地基变形特性的规律,总结了固结沉降的规律,为软土地基的固结沉降分析计算提供依据.  相似文献   
10.
Most ureteral tumors are transitional cell neoplasms. Neuroendocrine tumors of the genitourinary tract are extremely rare. To our knowledge, only one ureteral carcinoid tumor has been reported before. We report a second case of ureteral carcinoid tumor found in a 70-year-old female.  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