全文获取类型
收费全文 | 1401篇 |
免费 | 83篇 |
国内免费 | 12篇 |
专业分类
耳鼻咽喉 | 1篇 |
儿科学 | 126篇 |
妇产科学 | 24篇 |
基础医学 | 131篇 |
口腔科学 | 38篇 |
临床医学 | 203篇 |
内科学 | 311篇 |
皮肤病学 | 18篇 |
神经病学 | 41篇 |
特种医学 | 218篇 |
外科学 | 83篇 |
综合类 | 47篇 |
一般理论 | 1篇 |
预防医学 | 97篇 |
眼科学 | 23篇 |
药学 | 93篇 |
1篇 | |
中国医学 | 3篇 |
肿瘤学 | 37篇 |
出版年
2022年 | 5篇 |
2021年 | 9篇 |
2020年 | 12篇 |
2019年 | 9篇 |
2018年 | 15篇 |
2017年 | 21篇 |
2016年 | 17篇 |
2015年 | 24篇 |
2014年 | 27篇 |
2013年 | 35篇 |
2012年 | 32篇 |
2011年 | 42篇 |
2010年 | 48篇 |
2009年 | 53篇 |
2008年 | 43篇 |
2007年 | 30篇 |
2006年 | 30篇 |
2005年 | 30篇 |
2004年 | 21篇 |
2003年 | 21篇 |
2002年 | 32篇 |
2001年 | 26篇 |
2000年 | 17篇 |
1999年 | 27篇 |
1998年 | 88篇 |
1997年 | 84篇 |
1996年 | 91篇 |
1995年 | 59篇 |
1994年 | 56篇 |
1993年 | 49篇 |
1992年 | 25篇 |
1991年 | 27篇 |
1990年 | 14篇 |
1989年 | 44篇 |
1988年 | 37篇 |
1987年 | 42篇 |
1986年 | 24篇 |
1985年 | 35篇 |
1984年 | 25篇 |
1983年 | 29篇 |
1982年 | 19篇 |
1981年 | 19篇 |
1980年 | 11篇 |
1979年 | 9篇 |
1978年 | 7篇 |
1977年 | 12篇 |
1976年 | 10篇 |
1975年 | 8篇 |
1967年 | 7篇 |
1966年 | 4篇 |
排序方式: 共有1496条查询结果,搜索用时 109 毫秒
1.
PJ Commerford 《Cardiovascular journal of Africa》2015,26(4):151-Aug;26(4):151
2.
Hans Bosma Martin PJ van Boxtel Gertrudis IJM Kempen Jacques ThM van Eijk Jelle Jolles 《BMC public health》2007,7(1):179
Background
The aims of this study were to examine the extent to which higher intellectual abilities protect higher socio-economic groups from functional decline and to examine whether the contribution of intellectual abilities is independent of childhood deprivation and low birth weight and other socio-economic and developmental factors in early life. 相似文献3.
4.
5.
Previous reports in the literature have described correlation of increasing repeat length with severity of the phenotype, in Kennedy syndrome. We describe male siblings with different repeat lengths, with lack of expression of the phenotype in the sibling with the longer repeat length. The phenotype was identical to motor neurone disease. There is variability of expression in Kennedy syndrome and repeat length even in siblings cannot be taken as a conclusive indicator of severity. CAG repeat length cannot be used to predict the natural history of Kennedy disease. The diagnosis of Kennedy syndrome should be considered in male patients presenting with atypical motor neurone disease. 相似文献
6.
PJ Woll PhD MRCP R Pettengell PhD FRACP 《International journal of clinical practice》1997,51(2):111-115
SUMMARY The interferons are natural glycoproteins secreted in response to various stimuli, including viral infection. They have antiviral, antiproliferative and immunomodulatory effects on different target cell populations. Since recombinant human interferons have become available, they have been tested in a wide range of malignancies. They are well established in the treatment of hairy cell leukaemia, chronic myelogenous leukaemia and multiple myeloma. Although they have documented activity against lymphoma, melanoma, renal cell cancer and carcinoid tumours, their role in the treatment of these tumours is less clear. In the common solid tumours, such as lung cancer and colorectal cancer, the use of interferons remains experimental. Here we will summarise their practice applications in oncology, using randomised studies where available to establish their place in multi-modality treatment. We will not discuss their use as antiviral or immunomodulating agents in viral and autoimmune diseases, multiple sclerosis or after organ transplantation. 相似文献
7.
8.
T. A. Drews K. G. Lamping D. E. Laughlin W. P. Dole 《Medical & biological engineering & computing》1987,25(4):420-427
Although present sonomicrometer techniques for measuring continuous changes in vascular diameter are very useful, two problems
with available methods are difficulty in maintaining crystal alignment throughout an acute experiment and inability to measure
absolute dimensions less than 1 mm. We have designed and ultrasonic dimension gauge system to over come these problems. The
design uses a gate to pass a 20 MHz signal to a counter during the sonic travel time between crystals, and then converts the
digital count to an analogue voltage. Interference from the transmitting impulse in the received signal was minimised using
MOSFET transistors allowing measurements of absolute dimensions from 0.00 mm to 99.9 mm. An averaging effect which depends
upon the asynchrony between the basic timer and the counter clock results in a resolution of at least 10 μm. Repeated calibration
curves showed an accuracy of 2.5 μm without significant bias. Piezoelectric crystals were mounted to a lighweight stainless-steel
clip to facilitate attachment to the vessel and to maintain the crystals in focus during changes in diameter. Mean and phasic
diameters measured in the femoral artery with the clip device correlated well with measurements obtained with crystals sewn
to the adventitia of the femoral artery of the dog (slope =0.97, r=0.99). 相似文献
9.
10.