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   277144篇
  免费   22854篇
  国内免费   14517篇
耳鼻咽喉   2597篇
儿科学   3953篇
妇产科学   5474篇
基础医学   32598篇
口腔科学   4877篇
临床医学   34184篇
内科学   48237篇
皮肤病学   3372篇
神经病学   16697篇
特种医学   9692篇
外国民族医学   97篇
外科学   31639篇
综合类   34520篇
现状与发展   48篇
一般理论   61篇
预防医学   17974篇
眼科学   7445篇
药学   26735篇
  165篇
中国医学   10949篇
肿瘤学   23201篇
  2024年   725篇
  2023年   3645篇
  2022年   8919篇
  2021年   11998篇
  2020年   8754篇
  2019年   8153篇
  2018年   8718篇
  2017年   7501篇
  2016年   7237篇
  2015年   10717篇
  2014年   13685篇
  2013年   13377篇
  2012年   19749篇
  2011年   21510篇
  2010年   13005篇
  2009年   10549篇
  2008年   14976篇
  2007年   15263篇
  2006年   14872篇
  2005年   14887篇
  2004年   10982篇
  2003年   9942篇
  2002年   8849篇
  2001年   6253篇
  2000年   6295篇
  1999年   6733篇
  1998年   4136篇
  1997年   4046篇
  1996年   3155篇
  1995年   2929篇
  1994年   2545篇
  1993年   1774篇
  1992年   2504篇
  1991年   2163篇
  1990年   1825篇
  1989年   1607篇
  1988年   1417篇
  1987年   1347篇
  1986年   1082篇
  1985年   917篇
  1984年   763篇
  1983年   624篇
  1982年   560篇
  1981年   482篇
  1980年   447篇
  1979年   359篇
  1978年   303篇
  1977年   267篇
  1976年   243篇
  1974年   212篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
101.
102.
It's all about sex: gender, lung development and lung disease.   总被引:1,自引:0,他引:1  
Accumulating evidence suggests that gender affects the incidence, susceptibility and severity of several lung diseases. Gender also influences lung development and physiology. Data from both human and animal studies indicate that sex hormones might contribute to disease pathogenesis or serve as protective factors, depending on the disease involved. In this review, the influence of gender and sex hormones on lung development and pathology will be discussed, with specific emphasis on pulmonary fibrosis, asthma and cancer.  相似文献   
103.
The adequate treatment of methicillin-resistant Staphylococcus aureus (MRSA) osteomyelitis has intrigued clinicians for some time. As the resistance of these pathogens, coupled with the increase in community-acquired cases, continues steadily to rise, clinicians are finding it useful to employ multi-modal approaches for efficacious treatment. The authors present a single case report of a patient with recurrent MRSA osteomyelitis, lumbar paraspinal and epidural abscess. He was found to have decreased muscle strength and was hyporeflexic in the involved extremity. Serum testing demonstrated MRSA bacteremia. Neuroimaging studies revealed evidence of paraspinal abscess and a presumed herniated nucleus pulposus at the L5/S1 interspace with significant nerve root compromise. Despite antimicrobials, his symptoms persisted, necessitating surgical exploration. At surgery, paraspinal and epidural abscesses were encountered and debrided; however, no herniated disc was visualized. This case demonstrates the diagnostic and therapeutic dilemmas with which these lesions present. We postulate that the MRSA osteomyelitis/discitis pathogens were walled off in the disc space and subsequently inoculated the soft tissues with ensuing bacteremia. We concur that antimicrobial treatment should be the first line of therapy for these patients; however, surgical debridements and cautious spinal instrumentation should be employed where appropriate.  相似文献   
104.
Laparoscopic procedures continue to gain popularity over traditional open procedures for a number of abdominal and pelvic surgeries. With increasing experience, the application of this technique is rising because it provides an alternative, less invasive, approach to various surgical procedures. Herein, we report our experience with adult patients with polycystic kidney disease, requiring bilateral laparoscopic nephrectomy before renal transplantation.  相似文献   
105.
指背腱膜的解剖学研究   总被引:1,自引:1,他引:0  
目的 探讨指背腱膜的构成特点及临床意义。方法 在30只成人尸体手标本上,通过模拟手术,对指背腱膜的构成特点进行了应用解剖学观测。结果 指背腱膜的构成复杂,其中的外侧腱束、外侧束、外侧腱和中央束在手指畸形的发生中有着特殊的临床意义。外侧腱束主要形成伸近节指间关节的功能解剖机制;其与外侧束形成的密切纤维联系而具有协同外侧腱的功能;该腱束与屈肌腱鞘有联系又使其具有平衡屈肌和伸肌肌力的作用。中央束在指背腱膜的整体协调、畸形的发生及矫正过程中起着重要的功能。结论 通过对指背腱膜的解剖研究,可以解释因指屈、伸肌腱平衡被破坏后所形成的畸形。  相似文献   
106.
Guidelines for design of clinical trials evaluating behavioral headache treatments were developed to facilitate production of quality research evaluating behavioral therapies for management of primary headache disorders. These guidelines were produced by a Workgroup of headache researchers under auspices of the American Headache Society. The guidelines are complementary to and modeled after guidelines for pharmacological trials published by the International Headache Society, but they address methodologic considerations unique to behavioral and other nonpharmacological treatments. Explicit guidelines for evaluating behavioral headache therapies are needed as the optimal methodology for behavioral (and other nonpharmacologic) trials necessarily differs from the preferred methodology for drug trials. In addition, trials comparing and integrating drug and behavioral therapies present methodological challenges not addressed by guidelines for pharmacologic research. These guidelines address patient selection, trial design for behavioral treatments and for comparisons across multiple treatment modalities (eg, behavioral vs pharmacologic), evaluation of results, and research ethics. Although developed specifically for behavioral therapies, the guidelines may apply to the design of clinical trials evaluating many forms of nonpharmacologic therapies for headache.  相似文献   
107.
Functional separation of the lungs may be accomplished by several methods. Patient with restricted mouth opening has limited options for one-lung ventilation. We report the use of wire-guided endobronchial blockade, a new tool for achieving one-lung ventilation in a patient with restricted mouth opening requiring nasotracheal, fiberoptic intubation for esophagectomy and reconstruction with gastric tube substitution.  相似文献   
108.
[目的] 加强对输入性医学媒介生物预警应急工作,防止媒介传入,保障我国人民身体健康.[方法] 对江苏口岸2002~2005年上半年输入性媒介生物截获情况进行统计分析.[结果] 2002~2005年上半年江苏口岸输入性媒介生物疫情截获率逐年上升.[结论] 传染病传播媒介生物的监测、病原携带检测和传入性风险分析,将作为世界卫生组织评估“监测技术水平、预警反应能力和处置实力”的重要指标之一,成为各成员国关注的焦点,同时也将成为各成员国间设置贸易技术壁垒的重要手段之一.因此,加强传染病传播媒介生物监测和控制工作势在必行.  相似文献   
109.
110.
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