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   209519篇
  免费   18569篇
  国内免费   4425篇
耳鼻咽喉   3271篇
儿科学   4059篇
妇产科学   3573篇
基础医学   16899篇
口腔科学   7236篇
临床医学   19394篇
内科学   19638篇
皮肤病学   2445篇
神经病学   10404篇
特种医学   5703篇
外国民族医学   11篇
外科学   20236篇
综合类   34052篇
现状与发展   9篇
一般理论   24篇
预防医学   27875篇
眼科学   1984篇
药学   20424篇
  337篇
中国医学   25930篇
肿瘤学   9009篇
  2024年   551篇
  2023年   4016篇
  2022年   6456篇
  2021年   10401篇
  2020年   10113篇
  2019年   11381篇
  2018年   10119篇
  2017年   8745篇
  2016年   7870篇
  2015年   7288篇
  2014年   14414篇
  2013年   14631篇
  2012年   12926篇
  2011年   13743篇
  2010年   11050篇
  2009年   9491篇
  2008年   8784篇
  2007年   8864篇
  2006年   7575篇
  2005年   6376篇
  2004年   5277篇
  2003年   4694篇
  2002年   3626篇
  2001年   3017篇
  2000年   2684篇
  1999年   2193篇
  1998年   1743篇
  1997年   1571篇
  1996年   1261篇
  1995年   1205篇
  1994年   1100篇
  1993年   975篇
  1992年   891篇
  1991年   814篇
  1990年   709篇
  1989年   688篇
  1988年   635篇
  1987年   575篇
  1986年   529篇
  1985年   1783篇
  1984年   2054篇
  1983年   1288篇
  1982年   1710篇
  1981年   1183篇
  1980年   1013篇
  1979年   905篇
  1978年   739篇
  1977年   556篇
  1976年   701篇
  1975年   480篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
992.
Objective Report of two cases of exudative discoid and lichenoid dermatosis (Sulzberger-Garbe), with typical penile lesions. Differential diagnosis of persistent penile plaques. Background Following remission of the generalized eruption of exudative discoid and lichenoid dermatosis (Sulzberger-Garbe), it is not unusual to see a single remaining lesion localized on the penis. Since Sulzberger et al. (Sulzberger MB, Witten VH, Hunt JA. Puzzling persistent penile plaques. Arch Dermatol 1956:73:101-109) reviewed dermatoses presenting with puzzling persistent penile plaques in 1955, further dermatoses have evolved as important differential diagnoses. Much controversy has arisen as to the justification of exudative discoid and lichenoid dermatosis (Sulzberger-Garbe) as a disease entity. Conclusions Diagnosis of most cases of persistent plaques of dermatitis on the penis is possible with a careful examination of the entire skin, and a thorough history to discover past lesions. The possibility of malignancy makes a biopsy mandatory. Exudative discoid and lichenoid chronic dermatosis (Sulzberger-Garbe) typically responds well to systemic steroids. Intrale-sional triamcinolone acetonide has been demonstrated to be effective in the treatment of a persistent penile plaque in exudative discoid and lichenoid dermatosis (Sulzberger-Garbe), and may be helpful in discontinuing or reducing systemic therapy to a level compatible with long-term treatment.  相似文献   
993.
高位食管癌切除颈部胃食管重建术的临床应用和初步评价   总被引:1,自引:0,他引:1  
本文报道了我院自1988年至1994年间采用高位食管癌切除颈部胃食管重建术治疗高位食管癌23例的结果,其中男14例,女9例,年龄35-70岁,平均年龄52岁,病变位于颈段者11例,上胸段者12例。2,3,5年生存率分别为62.5%,55.1%,33.3%。同时介绍了手术要点和该术式的优点,并提出了吻合口瘘的预防措施。  相似文献   
994.
50种传统清热解毒药的抑菌实验   总被引:13,自引:1,他引:12  
华娟  周明康 《中药材》1995,18(5):255-258
本文报告了传统药物文献收载的50种清热解毒药的抑菌实验结果。显示抑菌作用的有41种,占82%。对阳性球菌显示有抑菌作用的有36种;对阴性杆菌显示有抑菌作用的有24种。其中的地胡椒、金果榄、毛果算盘子等显示有较广的抗菌效应,值得进一步研究。  相似文献   
995.
In this study, large areas of goldfish telencephalon were ablated including rostral nucleus preopticus periventriculare (rNPP), and degenerating axons were traced by a modified Fink and Heimer procedure. The lesioning procedure ablated large regions of area dorsalis telencephali pars medialis, centralis, and dorsolateral complex; and completely removed area ventralis telencephali pars dorsalis, ventralis, and lateralis. In addition, the supracommissural nucleus and rNPP were lesioned specifically because both nuclei have been thought to be involved in courtship behavior and endocrine control of reproduction. This investigation demonstrated extensive fiber projections from telencephalic nuclei and/or rNPP to the hypothalamus. Lesioned telencephalon and/or rNPP projected bilaterally to nucleus preopticus and the suprachiasmatic nucleus and unilaterally to the following tuberal nuclei: nucleus anterior tuberis, and the lateral hypothalamic nucleus. A much larger fiber projection to the inferior lobe nuclei was also observed with a large contralateral as well as ipsilateral input.  相似文献   
996.
Advances in biomedical science have resulted in dramatic improvementsin the medical care of chronically ill and handicapped children.Past measurement problems have resulted in a lack of clarityregarding the psychological adjustment of these children. Themothers of 270 chronically ill and handicapped children wereadministered the Child Behavior Checklist in an attempt to identifypatterns of behavioral functioning across six pediatric chronicdisorders: juvenile diabetes, spina bifida, hemophilia, chronicobesity, juvenile rheumatoid arthritis, and cerebral palsy.In general, it was found that children in all chronic disordergroups were perceived by their mothers as evidencing on theaverage more behavioral and social competence problems thanexpected based on norms for children in general. However, theirbehavioral and social adjustment was reported as better thanthat of a normative sample of children referred to mental healthclinics. There were essentially no differences between childrenwith different chronic disorders in terms of behavior problemsand social competence. The results were taken to support theview that these children were as a group at risk for adjustmentproblems. They were also discussed in terms of the noncategorialapproach, which suggests that similar psychosocial challengesare faced across pediatric chronic physical disorders.  相似文献   
997.
本文对300例肛肠疾病采用CO_2激光治疗,治愈率为94.33%,一次切割完成,不需止血缝合,一般7-15天痊愈,疗效明显优于其它治疗方法。  相似文献   
998.
The phosphorylation patterns of isolated red blood cell (RBC) membranes labeled with [ γ-32p]ATP are altered by Zn++ ions. Zn++ ions caused an increased phosphate incorporation into a 72 KDa protein and several proteins in the 40–60 KDa region and a decrease in the labeling of a 53 KDa protein. The 72 KDa and 53 KDa proteins have been identified as protein 4.2 and a protease-cleaved fragment of protein 3, respectively. Evidence suggests that the changes in phosphorylation pattern may be due to the stimulation of endogenous membrane alkaline phosphatase(s). Our results suggest that Zn++, at physiological concentrations in the intact erythrocyte, could modulate the phosphorylation of selected proteins which may regulate their association in the cytoskeletal network.  相似文献   
999.
本工作在于探讨单一电铃电路条件性训练在建立儿童自主排尿反射中的治疗作用。采用新型研制的电铃电路床单,将电铃声刺激与膀胱充盈刺激有效的吻合起来,夜间训练遗尿患儿清醒后自主排尿。对年龄5~10岁,经多项检查诊断确定为功能性遗尿的患儿(男18名,女4名)22人施行条件性行为训练方法。临睡的铺平电铃电路床单、患儿遗尿初期浸湿床单,引起铃响(患儿不惊醒时由母亲唤醒),患儿起床自主排尿。采用阳性强化法对患儿自主排尿进行巩固,给予原发以及继发性奖赏。结果:单一电铃电路条件性训练平均12个有效治疗日后,94.97%(18/19)患儿遗尿症状消失,其中效果最佳者仅用了3个有效治疗日,最后长的达30个有效治疗日,2人因故中断治疗,1人治疗无效。可见,单一行为方法是一条治疗儿童功能性遗尿的有效措施。  相似文献   
1000.
用双向电泳分析淡色库蚊卵、二令幼虫、四令幼虫、蛹和成虫蛋白质组成.电泳完毕后,用考马斯亮兰G-250染色,结果以成蚊蛋白质多肽点为最多(116点),其次依次为蛹(101点)、卵(70点)、四令幼虫(53点)、二令幼虫(18点)。它们在不同分子量和不同PH 范围内的分布也不同,但总的来看,在幼体阶段(卵、二、四令幼虫及蛹)多偏低分子量和低PI 值的点,发育至成虫阶段,分布走向全面。  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