全文获取类型
收费全文 | 1985篇 |
免费 | 84篇 |
专业分类
耳鼻咽喉 | 24篇 |
儿科学 | 78篇 |
妇产科学 | 77篇 |
基础医学 | 155篇 |
口腔科学 | 49篇 |
临床医学 | 312篇 |
内科学 | 464篇 |
皮肤病学 | 89篇 |
神经病学 | 97篇 |
特种医学 | 26篇 |
外科学 | 287篇 |
综合类 | 82篇 |
一般理论 | 9篇 |
预防医学 | 141篇 |
眼科学 | 18篇 |
药学 | 134篇 |
肿瘤学 | 27篇 |
出版年
2016年 | 9篇 |
2015年 | 25篇 |
2014年 | 29篇 |
2013年 | 33篇 |
2012年 | 12篇 |
2011年 | 10篇 |
2010年 | 50篇 |
2009年 | 61篇 |
2008年 | 9篇 |
2007年 | 11篇 |
2005年 | 9篇 |
2003年 | 13篇 |
2001年 | 18篇 |
2000年 | 14篇 |
1999年 | 33篇 |
1998年 | 37篇 |
1997年 | 80篇 |
1996年 | 58篇 |
1995年 | 39篇 |
1994年 | 57篇 |
1993年 | 44篇 |
1992年 | 38篇 |
1991年 | 37篇 |
1990年 | 45篇 |
1989年 | 32篇 |
1988年 | 45篇 |
1987年 | 31篇 |
1986年 | 27篇 |
1985年 | 14篇 |
1984年 | 21篇 |
1983年 | 17篇 |
1982年 | 28篇 |
1981年 | 22篇 |
1980年 | 21篇 |
1979年 | 26篇 |
1978年 | 13篇 |
1977年 | 18篇 |
1976年 | 16篇 |
1975年 | 12篇 |
1972年 | 9篇 |
1971年 | 9篇 |
1963年 | 14篇 |
1959年 | 75篇 |
1958年 | 125篇 |
1957年 | 128篇 |
1956年 | 134篇 |
1955年 | 112篇 |
1954年 | 136篇 |
1949年 | 42篇 |
1948年 | 45篇 |
排序方式: 共有2069条查询结果,搜索用时 31 毫秒
101.
The porcine bronchial artery: surgical and angiographic anatomy 总被引:2,自引:0,他引:2
JOHN GADE MARTIN A. NORGAARD CLAUS B. ANDERSEN GÖSTA PETTERSSON ULRIK G. SVENDSEN PETER S. OLSEN 《Journal of anatomy》1999,194(2):241-247
The pig is often used in experimental studies on the significance of bronchial artery circulation, but the anatomy of this artery is only poorly described. The purpose of this study was to improve the anatomical basis for experimental studies on the porcine bronchial artery circulation. The origin of the artery from the aorta is described in 32 pigs. Heart–lung blocks were perfused with saline and removed in 16 pigs, and the broncho-oesophageal orifice was identified and cannulated. In these 16 specimens the intrapulmonary ramification was studied by angiography, and the extrapulmonary distribution and supply area by injection of Evans Blue. The broncho-oesophageal artery originated from the aorta as a single trunk in 91%. Angiography showed that each principal bronchus was accompanied by 2 bronchial artery branches far into the lung parenchyma. The central branching pattern of the artery between the aorta and the principal bronchi was divided into 3 subtypes. Evans Blue showed communication with the whole mediastinum. The anatomical relations are described. It is concluded that the broncho-oesophageal artery divides to follow each bronchus with 2 bronchial branches. A nomenclature for these branches is suggested. The pig anatomy is suited for experimental investigations on the bronchial circulation. 相似文献
102.
ANDREW BOTTOMLEY phd CHANTAL QUINTEN msc CORNEEL COENS msc FRANCESCA MARTINELLI msc MURIELLE MAUER phd JOHN MARINGWA phd CHARLES S. CLEELAND phd HENNING FLECHTNER phd CAROLYN GOTAY phd EVA GREIMEL phd MADELEINE KING phd DAVID OSOBA md MARTIN J.B. TAPHOORN phd BRYCE B. REEVE phd JOLIE RINGASH phd JOSEPH SCHMUCKER-VON KOCH phd & JOACHIM WEIS phd 《European journal of cancer care》2009,18(2):105-107
103.
104.
SANTABHANU CHAKRABARTI M.D. GERGELY SZANTHO M.D. MARK S. TURNER Ph .D. M.R.C.P. GRAHAM STUART F.R.C.P. F.R.C.P.C.H. ROBIN P. MARTIN F.R.C.P. F.R.C.P.C.H. 《Pacing and clinical electrophysiology : PACE》2009,32(9):1123-1129
Background: Endocardial pacemaker lead placement can be challenging after Mustard and Senning operations for transposition of the great arteries (D-TGA), if there is atresia of the systemic venous pathways and because the coronary sinus cannot be used for cardiac resynchronization therapy. Radiofrequency (RF)-assisted perforation techniques have been used in congenital heart disease but have not been reported for use in pacemaker implantation.
Methods and Results: We describe RF perforation of an atretic superior systemic venous pathway and systemic venous baffles in three patients after Senning and Mustard operations to implant endocardial pacing systems to achieve conventional or biventricular pacing.
Conclusions: RF-energy-assisted perforation is feasible and effective tool to facilitate endocardial lead placement during dual-chamber and biventricular pacemaker implantation in patients with Mustard or Senning operations for D-TGA. 相似文献
Methods and Results: We describe RF perforation of an atretic superior systemic venous pathway and systemic venous baffles in three patients after Senning and Mustard operations to implant endocardial pacing systems to achieve conventional or biventricular pacing.
Conclusions: RF-energy-assisted perforation is feasible and effective tool to facilitate endocardial lead placement during dual-chamber and biventricular pacemaker implantation in patients with Mustard or Senning operations for D-TGA. 相似文献
105.
THOMAS G. BROWN MARIE CLAUDE OUIMET LOUISE NADEAU CHRISTINA GIANOULAKIS MARTIN LEPAGE JACQUES TREMBLAY MAURICE DONGIER 《Drug and alcohol review》2009,28(4):406-418
Issues. Driving while impaired by alcohol (DWI) is responsible for substantial mortality and injury. Significant gaps in our understanding of DWI re‐offending, or recidivism, reduce our ability to practically assess recidivism probability and to match interventions to individual risk profiles. These shortcomings reflect the baffling heterogeneity in the DWI population and the limited focus of much existing DWI recidivism research to psychosocial, psychological and substance use correlates. Approach. This narrative review summarises the evidence for the contribution of neurocognitive and psychobiological mechanisms to DWI behaviour and recidivism. Given the nascent nature of this literature, insight into the putative contribution of these mechanisms to DWI is also drawn from other experimental literatures, particularly those on alcohol use disorders and cognitive and behavioural neuroscience. Key Findings. Alcohol‐related neurotoxicity and dysregulation of hypothalamic–pituitary–adrenal axis and serotonergic systems may underlie certain offender characteristics consistently correlated with heightened DWI risk, persistence and intervention resistance. Their markers are less vulnerable to sources of bias than subjective psychosocial indices and are more far‐reaching than alcohol abuse in explaining DWI behaviour and recidivism. Implications. The investigation of neurocognitive and psychobiological mechanisms in DWI research is a promising avenue for discerning clinically meaningful subgroups within the DWI population. This can lead to research and development in alternative assessment and more targeted intervention technologies. Conclusion. Multidimensional research in DWI and recidivism offers novel avenues for increasing road safety.[Brown TG, Ouimet MC, Nadeau L, Gianoulakis C, Lepage M, Tremblay J, Dongier M. From the brain to bad behaviour and back again: Neurocognitive and psychobiological mechanisms of driving while impaired by alcohol. Drug Alcohol Rev 2009;28:406–418] 相似文献
106.
107.
MAY CI VAN SCHALKWYK NASON MAANI JONATHAN COHEN MARTIN MCKEE MARK PETTICREW 《The Milbank quarterly》2021,99(2):467
Policy Points
- Despite the pandemic''s ongoing devastating impacts, it also offers the opportunity and lessons for building a better, fairer, and sustainable world.
- Transformational change will require new ways of working, challenging powerful individuals and industries who worsened the crisis, will act to exploit it for personal gain, and will work to ensure that the future aligns with their interests.
- A flourishing world needs strong and equitable structures and systems, including strengthened democratic, research, and educational institutions, supported by ideas and discourses that are free of opaque and conflicted influence and that challenge the status quo and inequitable distribution of power.
108.
Seizures associated with 1% cyclopentolate eyedrops 总被引:1,自引:0,他引:1
D. A. FITZGERALD R. M. HANSON C. WEST F. MARTIN J. BROWN H. A. KILHAM 《Journal of paediatrics and child health》1990,26(2):106-107
A 4.5 year old boy with cerebral palsy presented with seizures associated with facial flushing and tachycardia following the instillation of 1% cyclopentolate, a commonly used mydriatic in paediatric practice. He had no prior history of convulsions. This case demonstrates the uncommon, though serious, atropine-like side effect of cyclopentolate eyedrops (Cyclogyl, Alcon) in usual dosage in a brain damaged child without an epileptic focus. 相似文献
109.
110.