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   35831篇
  免费   2106篇
  国内免费   106篇
耳鼻咽喉   341篇
儿科学   1256篇
妇产科学   949篇
基础医学   3986篇
口腔科学   418篇
临床医学   6299篇
内科学   6057篇
皮肤病学   374篇
神经病学   3730篇
特种医学   792篇
外国民族医学   1篇
外科学   3545篇
综合类   407篇
现状与发展   1篇
一般理论   52篇
预防医学   4924篇
眼科学   471篇
药学   2111篇
  2篇
中国医学   33篇
肿瘤学   2294篇
  2023年   208篇
  2022年   349篇
  2021年   651篇
  2020年   476篇
  2019年   732篇
  2018年   909篇
  2017年   631篇
  2016年   697篇
  2015年   759篇
  2014年   1083篇
  2013年   1744篇
  2012年   2490篇
  2011年   2647篇
  2010年   1418篇
  2009年   1242篇
  2008年   2375篇
  2007年   2577篇
  2006年   2475篇
  2005年   2371篇
  2004年   2192篇
  2003年   2137篇
  2002年   2026篇
  2001年   364篇
  2000年   311篇
  1999年   401篇
  1998年   420篇
  1997年   349篇
  1996年   278篇
  1995年   314篇
  1994年   243篇
  1993年   243篇
  1992年   219篇
  1991年   205篇
  1990年   214篇
  1989年   172篇
  1988年   153篇
  1987年   154篇
  1986年   151篇
  1985年   152篇
  1984年   167篇
  1983年   191篇
  1982年   165篇
  1981年   168篇
  1980年   136篇
  1979年   85篇
  1978年   90篇
  1977年   88篇
  1976年   59篇
  1975年   57篇
  1974年   60篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
41.
A 25–year-old woman was admitted to the hospital because of rising trough cyclosporine concentrations thought to be due to self-administration of 4 times the normal dosage of the drug for 8 days. Her symptoms included colicky central abdominal pains and urinary retention; her serum creatinine concentrations were elevated. Whole blood cyclosporine and metabolite concentrations were measured by high-performance liquid chromatography and monoclonal radioimmunoassays. The highest reported trough cyclosporine concentration was 5877 ng/ml, and AM1 (M17) concentration was 3425 ng/ml. A cyclosporine half-life of 91 hours was calculated. Nine days after the agent was discontinued the patient's serum creatinine concentration had returned to normal and her symptoms resolved. Due to the availability of three sizes of cyclosporine capsules, and the need for frequent dosage changes, continued vigilance is necessary to ensure that patients understand their drug regimen.  相似文献   
42.
43.
Our group has previously reported significant changes in the incorporation of precursors into glycerophospholipids, particularly phosphatidylserine, in polymorphonuclear cells obtained from the peripheral blood of cluster headache patients, when compared with controls. The potential of these results led to further work using both the previous methodology and a modified isolation technique to obtain polymorphonuclear cells in as pure a state as possible. Neither the new results obtained using the original technique, nor the results with high purity polymorphonuclear cells from controls and cluster headache patients, confirm the marked changes in precursor uptake into glycerophospholipids originally reported.  相似文献   
44.
We conducted a cohort study to identify the risks and outcomes of influenza A (H3N2) pneumonia. Of the 145 patients studied, 10 (7%) had influenza A pneumonia. Logistic regression identified multiple comorbidities (P<.001) and diarrhea at the initial presentation (P=.001) as associated risks. Infection with influenza A (P=.01) and receipt of inadequate antimicrobial therapy (P=.005) were predictors of mortality.  相似文献   
45.
The adsorptive stripping voltammetric behaviour of F(ab')2 and Fab fragments of anti-mouse immunoglobulin G is described. Conditions were optimized for the determination of these fragments with respect to accumulation potential, accumulation time, scan rate, pulse amplitude, drop size and electrolyte composition. The F(ab')2 and Fab fragments gave rise to behaviour similar to that reported previously for the intact immunoglobulin.  相似文献   
46.
47.
Background Despite considerable interest in the genetic, physical and neurological aspects of Rett syndrome (RS), there have been few studies of associated behavioural and emotional features. Furthermore, few case studiesor surveys have included adult women with RS. The main aim of the present study was to compare behaviour problems in a sample of women with RS against data from normative samples. Methods The primary carers of 50 women with RS completed the community version of the Aberrant Behavior Checklist. Results Women with RS were rated as having lower levels of irritability, hyperactivity and inappropriate speech behaviours than normative samples of adults with intellectual disability. Conclusions A number of factors may affect the presentation of behaviour problems in women with RS (e.g. cognitive impairments or physical disabilities). Therefore, more research is needed in order to generate information about the behavioural phenotype of RS. The implications of the present data for future research are also discussed.  相似文献   
48.
49.
Three patients,with known brain injury and neuropsychological impairments, are followed through an individualized cognitive rehabilitation programme and post discharge from the treatment programme. Single Photon Emission Computed Tomography (SPECT) of the brain was employed to evaluate resting relative cerebral blood flow (rCBF) during the process of recovery from brain injury. All patients experienced significant improvements on measures of neuropsychological functioning and improvements in rCBF during this longitudinal study. The specific changes in rCBF appear to be related to the location of the patient s brain injury and strategies particular to cognitive rehabilitation therapy. Continued improvements in rCBF, functional abilities, and cognitive skills were documented in these three cases up to 45 months post brain injury.  相似文献   
50.
The oral-motor function of 10 infants with Turner syndrome and their age- and sex-matched controls were assessed during feeding. In addition to well-recognised dysmorphic features, including oral anomalies and high-arched palates, index infants had marked hypotonia of the cheeks and lips, dysfunctional tongue movements and poorly developed chewing skills. Their meal-times were significantly shorter than those of the controls and they weighed significantly less at six, 12 and 15 months. All mothers of infants with Turner syndrome complained of difficulties feeding their children and these problems often had been present since birth.  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