全文获取类型
收费全文 | 2004篇 |
免费 | 124篇 |
国内免费 | 6篇 |
专业分类
耳鼻咽喉 | 11篇 |
儿科学 | 52篇 |
妇产科学 | 33篇 |
基础医学 | 213篇 |
口腔科学 | 30篇 |
临床医学 | 189篇 |
内科学 | 333篇 |
皮肤病学 | 16篇 |
神经病学 | 220篇 |
特种医学 | 120篇 |
外科学 | 290篇 |
综合类 | 56篇 |
一般理论 | 1篇 |
预防医学 | 242篇 |
眼科学 | 15篇 |
药学 | 128篇 |
中国医学 | 21篇 |
肿瘤学 | 164篇 |
出版年
2021年 | 17篇 |
2020年 | 18篇 |
2019年 | 27篇 |
2018年 | 33篇 |
2017年 | 25篇 |
2016年 | 21篇 |
2015年 | 29篇 |
2014年 | 42篇 |
2013年 | 88篇 |
2012年 | 89篇 |
2011年 | 85篇 |
2010年 | 73篇 |
2009年 | 63篇 |
2008年 | 79篇 |
2007年 | 85篇 |
2006年 | 106篇 |
2005年 | 84篇 |
2004年 | 102篇 |
2003年 | 75篇 |
2002年 | 58篇 |
2001年 | 51篇 |
2000年 | 64篇 |
1999年 | 46篇 |
1998年 | 38篇 |
1997年 | 35篇 |
1996年 | 36篇 |
1995年 | 41篇 |
1994年 | 24篇 |
1993年 | 20篇 |
1992年 | 45篇 |
1991年 | 32篇 |
1990年 | 30篇 |
1989年 | 60篇 |
1988年 | 29篇 |
1987年 | 46篇 |
1986年 | 40篇 |
1985年 | 31篇 |
1984年 | 37篇 |
1983年 | 22篇 |
1982年 | 17篇 |
1981年 | 17篇 |
1980年 | 15篇 |
1979年 | 16篇 |
1978年 | 16篇 |
1977年 | 13篇 |
1976年 | 11篇 |
1975年 | 16篇 |
1974年 | 14篇 |
1973年 | 10篇 |
1968年 | 8篇 |
排序方式: 共有2134条查询结果,搜索用时 125 毫秒
1.
2.
3.
4.
P Gustafson K Herrlin L Biling H Willén A Rydholm 《Acta radiologica (Stockholm, Sweden : 1987)》1992,33(5):474-476
Fifty-one patients with deep-seated soft tissue sarcoma of the extremities and trunk wall were examined with contrast-enhanced CT for presence of nonenhanced tumor areas (CT necrosis). After a median follow-up time of 3 years, 19 of the 41 patients with CT necrosis had developed metastases, compared to none of the 10 patients who had tumors without CT necrosis. Tumors with CT necrosis were larger than tumors without, but in tumors of similar size, absence of CT necrosis was a favorable prognostic sign. 相似文献
5.
6.
Robert C Susil Kevin Camphausen Peter Choyke Elliot R McVeigh Gary S Gustafson Holly Ning Robert W Miller Ergin Atalar C Norman Coleman Cynthia Ménard 《Magnetic resonance in medicine》2004,52(3):683-687
A technique for transperineal high-dose-rate (HDR) prostate brachytherapy and needle biopsy in a standard 1.5 T MRI scanner is demonstrated. In each of eight procedures (in four patients with intermediate to high risk localized prostate cancer), four MRI-guided transperineal prostate biopsies were obtained followed by placement of 14-15 hollow transperineal catheters for HDR brachytherapy. Mean needle-placement accuracy was 2.1 mm, 95% of needle-placement errors were less than 4.0 mm, and the maximum needle-placement error was 4.4 mm. In addition to guiding the placement of biopsy needles and brachytherapy catheters, MR images were also used for brachytherapy treatment planning and optimization. Because 1.5 T MR images are directly acquired during the interventional procedure, dependence on deformable registration is reduced and online image quality is maximized. 相似文献
7.
The first 150 words of the full text of this article appear below. Key points Coronary artery disease accounts for >30% ofdeaths in Western society. The diagnosis of myocardial infarctionshould be qualified by size, causation and time from occurrence. Mortalityis reduced by immediate or primary percutaneouscoronary intervention or thrombolysis within the first 24 hof onset of ST-segment elevation myocardial infarction. Strategiesto reduce platelet activation (glycoprotein IIb/IIIa receptorantagonists, or clopidogrel) are now recommended in the treatmentof high-risk non-ST-segment myocardial infarction/unstable angina. Elevatedserum troponins may be the result of non-ischaemic myocardialdamage, especially in critical illness.
Pathophysiology
Changes in the definition of terms relating to the diagnosisof myocardial infarction (MI) have evolved by better understandingof the pathophysiology culminating in the new term of acutecoronary syndrome (ACS). Figure 1 illustrates the processesthat occur in the development of an acute coronary event. 相似文献
8.
9.
Familial Pick''s disease and dementia in frontal lobe degeneration of non-Alzheimer type are not variants of prion disease. 下载免费PDF全文
10.
We analysed 256 patients with primary soft-tissue sarcoma of the extremities diagnosed between 1970 and 1990 to see if tumour-related and host-related prognostic factors influenced both the selection of operation and the margin of clearance obtained at surgery. Amputation was more often performed in young patients, in those with distal tumours, and in those with deep-seated tumours. Inadequate surgical margins (those with a high risk of local recurrence) were more common in patients with deep-seated and large tumours than in patients with superficial and small tumours. These features of the tumour and the host, which have been shown to be prognostic for survival, also influenced the choice and performance of surgical procedures. 相似文献