全文获取类型
收费全文 | 23404篇 |
免费 | 4201篇 |
国内免费 | 265篇 |
专业分类
耳鼻咽喉 | 923篇 |
儿科学 | 679篇 |
妇产科学 | 518篇 |
基础医学 | 1922篇 |
口腔科学 | 649篇 |
临床医学 | 3268篇 |
内科学 | 5282篇 |
皮肤病学 | 714篇 |
神经病学 | 2231篇 |
特种医学 | 901篇 |
外科学 | 4876篇 |
综合类 | 396篇 |
现状与发展 | 2篇 |
一般理论 | 8篇 |
预防医学 | 2190篇 |
眼科学 | 570篇 |
药学 | 995篇 |
中国医学 | 8篇 |
肿瘤学 | 1738篇 |
出版年
2023年 | 585篇 |
2022年 | 252篇 |
2021年 | 493篇 |
2020年 | 873篇 |
2019年 | 425篇 |
2018年 | 886篇 |
2017年 | 825篇 |
2016年 | 944篇 |
2015年 | 934篇 |
2014年 | 1231篇 |
2013年 | 1480篇 |
2012年 | 929篇 |
2011年 | 864篇 |
2010年 | 953篇 |
2009年 | 1134篇 |
2008年 | 847篇 |
2007年 | 772篇 |
2006年 | 844篇 |
2005年 | 701篇 |
2004年 | 642篇 |
2003年 | 615篇 |
2002年 | 581篇 |
2001年 | 562篇 |
2000年 | 575篇 |
1999年 | 523篇 |
1998年 | 401篇 |
1997年 | 398篇 |
1996年 | 446篇 |
1995年 | 402篇 |
1994年 | 279篇 |
1993年 | 221篇 |
1992年 | 423篇 |
1991年 | 420篇 |
1990年 | 331篇 |
1989年 | 395篇 |
1988年 | 317篇 |
1987年 | 294篇 |
1986年 | 338篇 |
1985年 | 308篇 |
1984年 | 266篇 |
1983年 | 210篇 |
1982年 | 196篇 |
1979年 | 212篇 |
1978年 | 161篇 |
1977年 | 161篇 |
1975年 | 161篇 |
1974年 | 166篇 |
1973年 | 156篇 |
1972年 | 172篇 |
1971年 | 139篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
31.
32.
33.
Stimulation by mitogens and neuronal membranes of lymphocytes from patients with motor neurone disease 总被引:1,自引:0,他引:1
Jaqueline Aspin Roger Harrison Ahmed Jehanli George Lunt Malcolm Campbell 《Journal of neuroimmunology》1986,11(1):31-40
Stimulation of lymphocytes from motor neurone disease patients by either concanavalin A or PHA was shown to be significantly depressed relative to that from normal controls, as assayed by incorporation of [3H]thymidine or [3H]leucine or by glucose uptake. Corresponding significant differences were not shown by assays based upon incorporation of [3H]uridine or of lactate release. Lymphocytes from 4 out of 14 motor neurone disease patients showed a blastogenic response to membranes from rat spinal cord cells, compared with those from 0 out of 9 normal controls. These results not only suggest the possibility of an impaired cellular immune control in MND patients but also indicate the presence of lymphocytes sensitised specifically to neuronal membrane components. 相似文献
34.
Book reviewed in this articles: Essential Paediatric Dermatology . By J, Verbov Skin Disorders in the Elderly . Edited by B. E. Monk , R. A. C. Graham 相似文献
35.
36.
37.
38.
Noninvasive Intracranial Cerebral Flow Velocity Evaluation in the Emergency Department by Emergency Physicians 总被引:2,自引:0,他引:2
Michael Shafé MD Michael Blaivas MD RDMS Edmond Hooker MD Leigh Straus BS 《Academic emergency medicine》2004,11(7):774-777
Transcranial Doppler (TCD) is an accepted modality for the evaluation of cerebral blood flow velocities. OBJECTIVES: The purpose of this study was to test the feasibility of bedside TCD measurement in the emergency department (ED) with critically ill, intubated patients. METHODS: A prospective convenience sample of patients presenting to a university hospital over a two-month period underwent TCD evaluation of the middle cerebral artery. Intubated patients with head trauma and any patient requiring tracheal intubation were eligible. A 2-MHz Doppler probe was positioned over the temporal bone to acquire blood flow velocities. An emergency medicine resident and research assistant obtained measurements. Continuous TCD tracings were recorded on a video cassette recorder tape for quality assurance review and data collection. Vital signs and therapeutic interventions were also recorded. Flow velocities were measured in cm/s; the peak Resistance Index (RI) was calculated for each patient. RESULTS: A total of 30 patients were enrolled in the study. Adequate tracings were obtained in 25 patients (83%) without a disruption of resuscitation. Tracings could not be obtained in five patients; they were listed as TCD failures. However, in two of these patients, adequate flow velocity tracings were obtained after resuscitation. Four patients were evaluated during tracheal intubation. One patient was monitored successfully during cardiopulmonary resuscitation. The median time required for data acquisition was 1.9 minutes. The mean highest RI for those who expired was 0.84. For those who survived, the mean highest RI was 0.52. The difference of 0.32 was statistically significant (p = 0.04). CONCLUSIONS: Noninvasive blood flow velocity monitoring of the middle cerebral artery using TCD is feasible in the ED when performed at the bedside on intubated patients with traumatic brain injury and others during tracheal intubation and resuscitation. 相似文献
39.
Sanjay Sisodiya J Helen Cross Ingmar Blümcke David Chadwick John Craig Peter B Crino Paul Debenham Norman Delanty Frances Elmslie Mark Gardiner Jeffrey Golden David Goldstein David A Greenberg Renzo Guerrini Michael Hanna John Harris Paul Harrison Michael R Johnson George Kirov Dimitri M Kullman Andrew Makoff Carla Marini Rima Nabbout Lina Nashef Jeffrey L Noebels Ruth Ottman Munir Pirmohamed Asla Pitk?nen Ingrid Scheffer Simon Shorvon Graeme Sills Nicholas Wood Sameer Zuberi 《Epileptic Disord》2007,9(2):194-236
The Sixth Epilepsy Research Foundation workshop, held in Oxford in March 2006, brought together basic scientists, geneticists, epidemiologists, statisticians, pharmacologists and clinicians to consider progress, issues and strategies for harnessing genetics to improve the understanding and treatment of the epilepsies. General principles were considered, including the fundamental importance of clear study design, adequate patient numbers, defi ned phenotypes, robust statistical data handling, and follow-up of genetic discoveries. Topics where some progress had been made were considered including chromosomal abnormalities, neurodevelopment, hippocampal sclerosis, juvenile myoclonic epilepsy, focal cortical dysplasia and pharmacogenetics. The ethical aspects of epilepsy genetics were reviewed. Principles and limitations of collaboration were discussed. Presentations and their matched discussions are produced here. There was optimism that further genetic research in epilepsy was not only feasible, but might lead to improvements in the lives of people with epilepsy. 相似文献
40.