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   55558篇
  免费   4490篇
  国内免费   1705篇
耳鼻咽喉   519篇
儿科学   1131篇
妇产科学   1145篇
基础医学   6059篇
口腔科学   1125篇
临床医学   6242篇
内科学   10952篇
皮肤病学   1071篇
神经病学   3240篇
特种医学   1224篇
外国民族医学   6篇
外科学   6252篇
综合类   6170篇
现状与发展   2篇
一般理论   10篇
预防医学   4810篇
眼科学   1284篇
药学   4995篇
  53篇
中国医学   2294篇
肿瘤学   3169篇
  2024年   167篇
  2023年   714篇
  2022年   1698篇
  2021年   2698篇
  2020年   1906篇
  2019年   1815篇
  2018年   1986篇
  2017年   1763篇
  2016年   1503篇
  2015年   2202篇
  2014年   2909篇
  2013年   3390篇
  2012年   5021篇
  2011年   5076篇
  2010年   3424篇
  2009年   2956篇
  2008年   3617篇
  2007年   3542篇
  2006年   3096篇
  2005年   2809篇
  2004年   2193篇
  2003年   2064篇
  2002年   1686篇
  2001年   467篇
  2000年   380篇
  1999年   330篇
  1998年   283篇
  1997年   258篇
  1996年   229篇
  1995年   185篇
  1994年   149篇
  1993年   120篇
  1992年   108篇
  1991年   79篇
  1990年   83篇
  1989年   72篇
  1988年   64篇
  1987年   54篇
  1986年   56篇
  1985年   53篇
  1984年   47篇
  1983年   42篇
  1982年   58篇
  1981年   66篇
  1980年   36篇
  1979年   40篇
  1978年   21篇
  1977年   32篇
  1976年   31篇
  1975年   19篇
排序方式: 共有10000条查询结果,搜索用时 11 毫秒
31.
The aim of this research was to quantify sleep problems in patients suffering from Parkinson's disease by means of the new Parkinson's Disease Sleep Scale (PDSS) and to correlate such problems with the possible influence of current drug treatment. A total of 70 patients (36 men and 34 women) with a diagnosis of Parkinson's disease were enrolled. Their mean age was 69.7 +/- 8.2 years, and duration of disease was 7.4 +/- 4.8 years. All patients completed the PDSS and the Unified Parkinson's Disease Rating Scale (UPDRS Parts I-IV). Drug consumption and doses were registered. The mean score on the PDSS scale was 109.23 +/- 19.75 and on the UPDRS III scale was 25.24 +/- 11.35. The lowest scores were obtained in Item 3 (sleep fragmentation): 5.53 (2.46); and in Item 8 (nocturia): 5.75 (2.91). There was a weak correlation between the PDSS and UPDRS III (cc = -0.355, P = 0.003), PDSS and UPDRS I (cc = -0.272, P = 0.02), and PDSS and UPDRS IV (cc = -0.416, P < 0.001). Motor conditions, mental state, and drug complications influence sleep quality. Although this effect was significant, it was not of a great magnitude. Dopaminergic drugs did not increase daytime sleepiness. As a whole, sleep quality in patients who took dopaminergic agonists did not differ from that of patients who took levodopa in monotherapy.  相似文献   
32.
33.
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   
34.
Hyperoxaluria is frequently seen in patients with inflammatory bowel disease, or after resection of the ileum. It is assumed to be responsible for the development of nephrolithiasis, nephrocalcinosis (oxalate nephrosis) and progressive renal impairment in these patients. Steatorrhea may aggravate the severity of hyperoxaluria. A 60-year-old male underwent massive resection of the jejunum and ileum 10 years prior to admission, due to strangulation of the small bowel, with occlusion of the superior mesenteric artery. He remained well except for steatorrhea which developed two-and-a-half years prior to admission, when microhematuria, proteinuria and oxaluria developed progressively. Since that time, the nephrolithiasis, nephrocalcinosis and renal failure have continued to worsen despite therapy with oxalate restriction and oxalate-binding agents. A renal biopsy, performed late in the clinical course, showed severe changes in the renal parenchyma. The decline in renal function proved irreversible. The unusual metabolic consequences of massive resection of the small intestine and their mechanisms are discussed.  相似文献   
35.
Loss of heterozygosity for distal markers on 22q in human gliomas.   总被引:5,自引:0,他引:5  
Loss of constitutional heterozygosity as determined through the analysis of restriction-fragment-length polymorphism (RFLP) on tumoral and constitutional DNA has proven to be helpful to delimit the location of tumor-suppressor genes in the human genome. In malignant gliomas this approach indicates that chromosomes 9p, 10, 17p, and 22 may contain genes of this category involved in its origin and/or progression. Regarding chromosome 22, the data so far provided by molecular studies confirmed those previously reported by cytogenetic studies, suggesting the existence of a sub-group of malignant gliomas characterized by monosomy of this chromosome. However, the precise location of the putative glioma suppressor gene on chromosome 22 remains ambiguous. We have performed a combined cytogenetic and RFLP study on a series of 31 gliomas, looking for structural abnormalities of this chromosome. In 3 instances, terminal deletions of the long arm of chromosome 22 were observed by both methodologies, suggesting that the band q13 region distal to the D22S80 marker might be the critical domain non-randomly involved in tumor suppression of gliomas.  相似文献   
36.
大学生生涯规划及其对护理教育的意义   总被引:1,自引:0,他引:1  
对大学生生涯规划及国内外研究状况进行综述,指出生涯规划对护理教育的意义,提出在高等护理教育中加强大学生的生涯规划将是我国护理教育的主要发展方向之一。  相似文献   
37.
38.
Stress is known to be one of the risk factors of stroke. Most of the knowledge on the effects of stress on cerebrovascular disease in humans is restricted to catecholamines and glucocorticoids effects on blood pressure and/or development of atherosclerosis. However, few experimental studies have examined the possible mechanisms by which stress may affect stroke outcome. We have used an acute stress protocol consisting of the exposure of male Fischer rats to an acute, single exposure immobilisation protocol (6 h) prior to permanent middle cerebral artery occlusion (MCAO), and we have found that stress worsens behavioural and neurological outcomes and increased infarct size after MCAO. The possible regulatory role of the TNFalpha and IL-1beta was studied by looking at the release of these cytokines in brain. The results of the present study showed an increase in IL-1beta release in cerebral cortex after exposure to acute stress. Brain levels of IL-1beta are also higher in previously stressed MCAO rats than in MCAO animals without stress. Pharmacological blockade of IL-1beta with an antibody anti-IL-1beta led to a decrease in the infarct size as well as in neurological and behavioural deficits after MCAO. In summary, our results indicate that IL-1beta, but not TNFalpha, accounts at least partly for the worsening of MCAO consequences in brain of rats exposed to acute stress.  相似文献   
39.
40.
Abstract: Hydantoin is an anticonvulsant drug with several side effects. A teralogenic potential has been suggested. The fetal hydantoin syndrome is an entity that consists of a broad range of morphologic and developmental disorders in children born of epileptic mothers exposed to hydantoin during pregnancy. We treated a girl in whom onychopathy was a monosymptomatic or mild form of this syndrome.  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