全文获取类型
收费全文 | 26637篇 |
免费 | 2518篇 |
国内免费 | 54篇 |
专业分类
耳鼻咽喉 | 398篇 |
儿科学 | 697篇 |
妇产科学 | 423篇 |
基础医学 | 3781篇 |
口腔科学 | 640篇 |
临床医学 | 2767篇 |
内科学 | 5023篇 |
皮肤病学 | 327篇 |
神经病学 | 2208篇 |
特种医学 | 844篇 |
外科学 | 3874篇 |
综合类 | 598篇 |
一般理论 | 28篇 |
预防医学 | 2858篇 |
眼科学 | 738篇 |
药学 | 1799篇 |
中国医学 | 26篇 |
肿瘤学 | 2180篇 |
出版年
2021年 | 426篇 |
2020年 | 249篇 |
2019年 | 373篇 |
2018年 | 466篇 |
2017年 | 346篇 |
2016年 | 400篇 |
2015年 | 450篇 |
2014年 | 626篇 |
2013年 | 915篇 |
2012年 | 1376篇 |
2011年 | 1365篇 |
2010年 | 743篇 |
2009年 | 669篇 |
2008年 | 1171篇 |
2007年 | 1267篇 |
2006年 | 1236篇 |
2005年 | 1288篇 |
2004年 | 1148篇 |
2003年 | 1117篇 |
2002年 | 1023篇 |
2001年 | 823篇 |
2000年 | 825篇 |
1999年 | 710篇 |
1998年 | 292篇 |
1997年 | 267篇 |
1996年 | 266篇 |
1995年 | 243篇 |
1994年 | 241篇 |
1993年 | 213篇 |
1992年 | 603篇 |
1991年 | 535篇 |
1990年 | 505篇 |
1989年 | 530篇 |
1988年 | 457篇 |
1987年 | 438篇 |
1986年 | 418篇 |
1985年 | 398篇 |
1984年 | 333篇 |
1983年 | 272篇 |
1982年 | 207篇 |
1981年 | 215篇 |
1979年 | 304篇 |
1978年 | 268篇 |
1977年 | 185篇 |
1975年 | 195篇 |
1974年 | 262篇 |
1973年 | 209篇 |
1972年 | 215篇 |
1971年 | 175篇 |
1969年 | 170篇 |
排序方式: 共有10000条查询结果,搜索用时 203 毫秒
21.
Long-term results of pectoralis major muscle transposition for infected sternotomy wounds. 总被引:1,自引:0,他引:1 下载免费PDF全文
During an 11.5-year period, 100 consecutive patients (79 male, 21 female) underwent repair of an infected sternotomy wound. Sixty-five patients had failed attempts at wound closure by other physicians. Median age was 61.5 years (range, 5 to 85 years). Reconstruction included muscle in 79 patients, omentum in 4, and both in 15. A total of 175 muscles were transposed, including 169 pectoralis major, 3 rectus abdominis, 2 external oblique, and 1 latissimus dorsi. Median number of operations was four (range, 1 to 11). Mechanical ventilation was required in 30 patients. Two perioperative deaths occurred, one related to sepsis. Median follow-up was 4.2 years (range, 1.3 to 13.5 years). Twenty-six patients had recurrent infection. Median time from our closure to recurrence was 5.5 months (range, 0.3 to 27.6 months). Cause of recurrence was inadequate removal of cartilage in 16 patients, bone in 6, and retained foreign body in 4. Eighteen patients had the wound reopened with further resection; 10 had another muscle or omentum transposition. There were 30 late deaths, only one related to recurrent infection. At the time of death or last follow-up, 92 patients had a healed chest wall. Transposition of the pectoralis major muscle remains an excellent method of management for infected sternotomy wounds. Failure is directly related to persistent infection of cartilage, bone, or retained foreign bodies. 相似文献
22.
23.
Leonard A. Jason PhD Steven B. Pokorny PhD Monica Adams MPH Annie Topliff MA Courtney Harris BA Yvonne Hunt PhD 《The American journal on addictions / American Academy of Psychiatrists in Alcoholism and Addictions》2009,18(5):367-374
This study evaluated the effects of tobacco Purchase, Use and Possession (PUP) laws on student perceptions of adolescent tobacco use within towns and schools. Twenty‐four towns were randomly assigned into two conditions, the experimental condition (E PUP) involved efforts to increase both PUP law enforcement and reduce minors' access to commercial sources of tobacco, whereas the control condition (C) focused only on efforts to reduce minors' access to commercial sources of tobacco. A hierarchical linear modeling analytical approach was selected due to the multilevel data and nested design. The present study found that over time, youth in the experimental PUP condition observed less youth tobacco usage at school and in their town, and perceived lower rates of tobacco among their peers at school and among friends than youth in the control condition. The findings suggest that PUP law enforcement might be used to strengthen community norms against youth tobacco use. 相似文献
24.
U. Logonder Z. Jenko-Pranikar T. Scott-Davey J. Punger
ar I. Kriaj J.B. Harris 《Experimental neurology》2009,219(2):591-594
A mutant form of ammodytoxin A, a neurotoxic phospholipase A2 from the venom of the long nosed viper Vipera ammodytes ammodytes, was prepared by site-directed mutagenesis, conjugated to a nanogold particle and inoculated into the antero-lateral aspect of one hind limb of female mice. Eight hours later the mice were killed, the soleus muscles of both ipsi- and contra-lateral hind limbs were removed, exposed to a silver enhancing medium and then prepared for transmission electron microscopy. Silver-enhanced particles were subsequently found concentrated in the peri-synaptic area, particularly within the synaptic gutter and the deep synaptic folds, and in many cases had been taken up into the cytoplasm of the terminal boutons of the motor axon. The results suggest that the presynaptic neurotoxicity of snake venom phospholipases A2 involves several components of the neuromuscular apparatus, including intracellular organelles of the motor nerve terminal. 相似文献
25.
26.
Localized osteolysis in stable, non-septic total hip replacement 总被引:6,自引:0,他引:6
M J Jasty W E Floyd A L Schiller S R Goldring W H Harris 《The Journal of bone and joint surgery. American volume》1986,68(6):912-919
We are reporting four cases of extensive, localized bone resorption adjacent to a rigidly anchored, cemented total hip replacement. None of these hips showed evidence of infection on clinical, bacteriological, or pathological evaluation. The tissue from the regions of osteolysis showed sheets of macrophages and foreign-body giant cells invading the femoral cortices. Abundant methylmethacrylate particulate debris was present in the tissues, but polyethylene wear debris was absent. The histological appearance of this tissue resembled that reported about loosened total hip implants with the exception of the synovial-like layer at the cement surface. The cases reported here show that aggressive bone lysis may occur around stable cemented total hip arthroplasties without the presence of sepsis or malignant disease. 相似文献
27.
28.
J Harris 《Journal of medical ethics》1991,17(4):185-188
29.
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
30.
Gavin Wright 《ANZ journal of surgery》2005,75(11):952-952