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   318735篇
  免费   14927篇
  国内免费   11144篇
耳鼻咽喉   2315篇
儿科学   7983篇
妇产科学   4302篇
基础医学   32984篇
口腔科学   3916篇
临床医学   31908篇
内科学   51686篇
皮肤病学   2145篇
神经病学   23733篇
特种医学   14195篇
外国民族医学   92篇
外科学   43017篇
综合类   28889篇
现状与发展   52篇
一般理论   6篇
预防医学   28077篇
眼科学   6882篇
药学   24879篇
  145篇
中国医学   9791篇
肿瘤学   27809篇
  2024年   525篇
  2023年   2440篇
  2022年   6352篇
  2021年   8228篇
  2020年   6061篇
  2019年   5102篇
  2018年   26729篇
  2017年   21804篇
  2016年   23684篇
  2015年   7775篇
  2014年   9259篇
  2013年   8263篇
  2012年   17833篇
  2011年   32541篇
  2010年   26184篇
  2009年   17472篇
  2008年   26833篇
  2007年   28958篇
  2006年   7702篇
  2005年   9096篇
  2004年   8039篇
  2003年   8795篇
  2002年   6232篇
  2001年   3626篇
  2000年   3733篇
  1999年   3670篇
  1998年   2453篇
  1997年   2525篇
  1996年   1863篇
  1995年   1762篇
  1994年   1519篇
  1993年   935篇
  1992年   1127篇
  1991年   983篇
  1990年   869篇
  1989年   761篇
  1988年   637篇
  1987年   550篇
  1986年   468篇
  1985年   356篇
  1984年   169篇
  1983年   145篇
  1982年   97篇
  1981年   75篇
  1980年   89篇
  1979年   59篇
  1938年   60篇
  1934年   30篇
  1932年   56篇
  1930年   46篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
81.
985份病案质量检查分析   总被引:1,自引:0,他引:1  
姚炯  徐哲 《中国病案》2004,5(11):27-27
根据浙江省病历管理质控中心出台的住院病案质量检查评分表,对我院2003年4至12月九个月期间的住院病案随机抽检985份,探讨我院病历书写质量的现状、存在的问题,以及进一步提高病历质量的对策.  相似文献   
82.
Conclusion In the year 2003 there is no “one best bariatric operation” for every severely obese patient. The choice of operation must be tailored to each individual patient’s needs and wishes. For the superobese patient, the patient diagnosed with intestinal metaplasia of the stomach, and for those patients who do not wish to undergo the severe dietary restrictions imposed by the RNY-GB, the BPD-DS is a valuable surgical option.  相似文献   
83.
Depressive symptoms in older adults are common, but the minority of elderly meet criteria for major depressive disorder. This has led to confusion regarding the recognition of diagnosis, approach to treatment, and monitoring of outcomes in this needy population. Few depressed older adults are willing to seek treatment from psychiatrists or mental health specialists. Treatment approaches to the depressive spectrum of disorders in late life, which encompasses major and minor depressive disorder, dysthymic disorder, and mood disorders related to medical conditions, must include evidence-based algorithms that can be delivered in a variety of health care settings. Several recent multisite trials have advanced the use of collaborative care models and the systematic stepwise approach to the treatment of depression and anxiety states in older adults. This offers the ability to provide effective treatment of depression for older adults, consistent with current guidelines, in primary care and specialized health care settings.  相似文献   
84.
85.
86.
目的 探讨冠状动脉内支架置入术并发症的观察及护理.方法 回顾分析338例行冠状动脉内支架置入术患者的临床资料.结果 术中发生室颤5例,均经电复律后窦性心律恢复.术后共发生并发症27例,其中亚急性支架内血栓形成1例,心包填塞1例,拔管时发生血管迷走神经反射12例,穿刺部位出血5例,皮下血肿7例,假性动脉瘤3例.结论 严密的观察和护理干预可有效减少冠脉内支架置入术并发症的发生.  相似文献   
87.
88.
Purpose Reelin is important in the guidance of neuronal stem cells in the central nervous system during normal development. We wished to determine whether reelin is expressed in the retina and cornea after injury. Methods Mice underwent laceration of their retina as well as corneal epithelial debridement. The mice were sacrificed at 3 days, and eyes were fixed and stained for reelin expression and reelin messenger ribonucleic acid (mRNA). Results In normal eyes, reelin was expressed only at very low levels in the ganglion cell layer of the retina and the endothelial cell layer of the cornea. In injured eyes, there was marked expression in reelin immunoreactivity in the retina and cornea. Reelin gene expression was seen in the retina and cornea. Conclusions Reelin is expressed during normal retinogenesis. This study shows that reelin is also upregulated following injury to the retina and cornea. The expression of reelin following injury suggests that reelin may play an important role in regulating stem cell trafficking in neuronal and nonneuronal tissues following injury similar to its role in normal organogenesis. For consideration of publication in Graefe’s Archive for Clinical and Experimental Ophthalmology.  相似文献   
89.
Background A recombinant form of the α2(IV)NC1 domain of type IV collagen has been shown to have potent anti-angiogenic activity although this peptide has not been studied in the context of proliferative retinopathies. In the current investigation we examined the potential for α2(IV)NC1 to regulate retinal microvascular endothelial cell function using a range of in vitro and in vivo assay systems. Materials and methods α2(IV)NC1 at concentrations between 0.1 and 1 μg/ml was added to retinal microvascular endothelial cells (RMECs) followed by assessment of cell attachment, proliferation and survival. This agent was also tested within a novel in vitro three-dimensional retinal angiogenesis assay and the number of angiogenic sprouts quantified. α2(IV)NC1 was also delivered intra-vitreally to mice with oxygen-induced proliferative retinopathy (OIR) and neovascularisation evaluated in comparison with vehicle-treated controls. Results RMECs treated with α2(IV)NC1 (0.1, 0.5 and 1 μg/ml) showed delayed attachment at 3 h post-seeding, although this deficit had been restored at the 6-h time point. BrdU assay of DNA replication revealed that confluent RMECs treated with α2(IV)NC1 showed no measurable response in comparison with vehicle-treated controls. By contrast, proliferation of sub-confluent RMECs was significantly reduced by α2(IV)NC1 at 0.5 μg/ml (P<0.01). α2(IV)NC1 also induced apoptosis in RMECs and inhibited angiogenesis of pre-existing retinal vascular networks in vitro (P<0.001). Intra-vitreal injection of α2(IV)NC1 in the OIR model significantly inhibited pre-retinal neovascularisation compared with vehicle-treated controls (P<0.001). Conclusion α2(IV)NC1 inhibits angiogenesis in the retinal microvasculature. This recombinant protein has potential for the treatment of neovascularisation in proliferative retinopathies. BioStratum Inc. did not sponsor this research in any way. None of the authors are paid consultants with this company.  相似文献   
90.
跳水运动员颈椎损伤的生物力学研究   总被引:1,自引:1,他引:0  
作者通过在新鲜成人颈椎标本上做了椎体静力性负荷和动力性负荷实验,表明颈椎在后伸位应力为前屈位的50%,最大应力位于颈椎4-6,是跳水运动员头颈部入水时引起颈椎致伤的生物力学因素。  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