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   2861806篇
  免费   227390篇
  国内免费   5224篇
耳鼻咽喉   41061篇
儿科学   89642篇
妇产科学   74974篇
基础医学   413254篇
口腔科学   81985篇
临床医学   261588篇
内科学   554740篇
皮肤病学   59416篇
神经病学   232984篇
特种医学   113025篇
外国民族医学   946篇
外科学   431956篇
综合类   66954篇
现状与发展   3篇
一般理论   1096篇
预防医学   227902篇
眼科学   67532篇
药学   216126篇
  7篇
中国医学   6179篇
肿瘤学   153050篇
  2018年   29417篇
  2017年   22708篇
  2016年   25117篇
  2015年   28314篇
  2014年   40318篇
  2013年   61305篇
  2012年   82449篇
  2011年   87130篇
  2010年   51321篇
  2009年   48911篇
  2008年   82341篇
  2007年   88023篇
  2006年   89009篇
  2005年   86062篇
  2004年   83164篇
  2003年   80000篇
  2002年   78912篇
  2001年   134736篇
  2000年   139039篇
  1999年   117110篇
  1998年   33205篇
  1997年   29899篇
  1996年   29865篇
  1995年   28740篇
  1994年   26945篇
  1993年   25096篇
  1992年   94261篇
  1991年   91592篇
  1990年   88777篇
  1989年   85839篇
  1988年   79577篇
  1987年   78190篇
  1986年   74132篇
  1985年   70485篇
  1984年   53134篇
  1983年   45182篇
  1982年   26999篇
  1981年   24080篇
  1979年   49685篇
  1978年   34978篇
  1977年   29438篇
  1976年   27861篇
  1975年   29581篇
  1974年   36183篇
  1973年   34319篇
  1972年   32234篇
  1971年   29735篇
  1970年   28119篇
  1969年   26133篇
  1968年   23798篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
91.
92.
Caring for patients with end-stage kidney disease (ESKD) in the United States is challenging, due in part to the complex epidemiology of the disease's progression as well as the ways in which care is delivered. As CKD progresses toward ESKD, the number of comorbidities increases and care involves multiple healthcare providers from multiple subspecialties. This occurs in the context of a fragmented US healthcare delivery system that is traditionally siloed by provider specialty, organization, as well as systems of payment and administration. This article describes the role of care fragmentation in the delivery of optimal ESKD care and identifies research gaps in the evidence across the continuum of care. We then consider the impact of care fragmentation on ESKD care from the patient and health system perspectives and explore opportunities for system-level interventions aimed at improving care for patients with ESKD.  相似文献   
93.
94.
Nevo  N.  Goldstein  A. L.  Staierman  M.  Eran  N.  Carmeli  I.  Rayman  S.  mnouskin  Y. 《Hernia》2022,26(6):1491-1499
Hernia - The minimally invasive surgical repair of combined inguinal and ventral hernias often requires shifting from one approach or plane to another. The traditional enhanced-view totally...  相似文献   
95.
目的探讨维生素D(VitD)联合鱼油对糖尿病前期(PDM)患者糖脂代谢、胰岛β细胞功能的影响。 方法选取PDM患者132例,随机均分为联合组(VitD+鱼油)、VitD组(VitD)和对照组(不干预)。比较各组糖脂代谢、胰岛β细胞功能、炎症反应、血管内皮功能等指标。 结果与干预前比较,干预后联合组甘油三酯降低,白细胞介素-10增高(P<0.05),联合组和VitD组低密度脂蛋白胆固醇、肿瘤坏死因子-α、胰岛素抵抗指数、前列腺素E2、瘦素、抵抗素降低(P<0.05),空腹胰岛素、胰岛β细胞功能指数、脂联素增高(P<0.05),且联合组改善更为明显(P<0.05)。 结论维生素D联合鱼油治疗PDM患者可改善其脂代谢和胰岛功能相关指标,具有一定临床应用价值。  相似文献   
96.
Haemophilia is a common cause of genetically inherited bleeding disorders. Pseudotumours occur in 1–2 % of persons with severe forms of haemophilia. These are a result of repeated haemorrhage into soft tissues, subperiosteum or a site of bone fracture with inadequate resorption of the extravasated blood. There are a number of therapeutic alternatives for this dangerous condition: surgical removal, percutaneous management, irradiation, embolization etc. In this case report, we describe the natural history, clinical course and successful surgical management of a patient with haemophilia who presented with a massive pseudotumour. We also briefly review the relevant literature on the various therapeutic modalities that have been implemented in the management of this rare complication. Though surgeons may be averse to operate on haemophiliacs, primary surgical management as done in our case may prove to be the definitive treatment option for such patients.  相似文献   
97.
98.
99.
Red cell exchange (RCE) is a common procedure in adults with sickle cell disease (SCD). Implantable dual lumen Vortex (DLV) ports can be used for RCE in patients with poor peripheral venous access. We performed a retrospective cohort study of RCE procedures performed in adults with SCD. The main objective of the study was to compare the inlet speed, duration of procedures and rate of complications performed through DLV ports to those performed through temporary central venous and peripheral catheters. Twenty‐nine adults with SCD underwent a total of 318 RCE procedures. Twenty adults had DLV ports placed and 218 procedures were performed using DLV ports. Mean length of follow‐up after DLV port placement was 397 ± 263 days. Six DLV ports were removed due to infection and 1 for malfunction after a mean of 171 ± 120 days. Compared to temporary central venous and peripheral catheters, DLV port procedures had a greater rate of procedural complications, a longer duration, and a lower inlet speed (all P < 0.01). When accounting for the maximum allowable inlet speed to avoid citrate toxicity, 40% of DLV port procedures were greater than 10% below maximum speed, compared to 7 and 14% of procedures performed through temporary central venous and peripheral catheters (P < 0.0001). In conclusion, DLV ports can be used for RCE in adults with SCD, albeit with more procedural complications and longer duration. The smaller internal diameter and longer catheter of DLV ports compared to temporary central venous catheters likely accounts for the differences noted. J. Clin. Apheresis 30:353–358, 2015. © 2015 Wiley Periodicals, Inc.  相似文献   
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