全文获取类型
收费全文 | 300423篇 |
免费 | 21994篇 |
国内免费 | 76篇 |
出版年
2018年 | 3920篇 |
2017年 | 3763篇 |
2016年 | 4734篇 |
2015年 | 4654篇 |
2014年 | 6071篇 |
2013年 | 8680篇 |
2012年 | 10013篇 |
2011年 | 10509篇 |
2010年 | 7481篇 |
2009年 | 6481篇 |
2008年 | 9384篇 |
2007年 | 9642篇 |
2006年 | 9191篇 |
2005年 | 8615篇 |
2004年 | 8715篇 |
2003年 | 8389篇 |
2002年 | 8217篇 |
2001年 | 12685篇 |
2000年 | 12271篇 |
1999年 | 9565篇 |
1998年 | 3014篇 |
1997年 | 2881篇 |
1996年 | 2645篇 |
1995年 | 2419篇 |
1992年 | 7423篇 |
1991年 | 7608篇 |
1990年 | 7587篇 |
1989年 | 7370篇 |
1988年 | 6868篇 |
1987年 | 6483篇 |
1986年 | 5989篇 |
1985年 | 6144篇 |
1984年 | 4921篇 |
1983年 | 4124篇 |
1982年 | 2847篇 |
1981年 | 2506篇 |
1980年 | 2424篇 |
1979年 | 4598篇 |
1978年 | 3572篇 |
1977年 | 3255篇 |
1976年 | 3196篇 |
1975年 | 3835篇 |
1974年 | 4223篇 |
1973年 | 4273篇 |
1972年 | 3773篇 |
1971年 | 3532篇 |
1970年 | 3032篇 |
1969年 | 3007篇 |
1968年 | 2783篇 |
1967年 | 2513篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
911.
912.
913.
Summary Two siblings with a short-limb dwarfing condition which we call acromesomelic dysplasia, Hunter-Thompson type are reported. Abnormalities are limited to the limbs and limb joints in this severe form of dwarfism. The middle and distal
segments of the limbs are most affected. The lower limbs are more affected than the upper. We are aware of one previously
published case of this entity reported by A. G. W. Hunter and M. W. Thompson in 1976. Dislocations of the elbows and ankles
were present in all three patients and dislocations of the hips and knees in two. One of the siblings who did not have hip
and knee dislocations clinically resembled Grebe chondrodysplasia, another severe acromesomelic dwarfing condition. However,
radiological analysis suggests that while acromesomelic dysplasia, Hunter-Thompson type and Grebe chondrodysplasia are related,
they are not identical. Grebe chondrodysplasia has been established as an autosomal recessive trait. It appears probable that
the entity we describe has the same mode of genetic transmission. 相似文献
914.
Interaction of Legionella pneumophila with tissue culture cells 总被引:1,自引:0,他引:1
915.
916.
917.
918.
919.
Some preliminary data regarding the test of penetration and proliferation of BHK and HeLa cells biocompatibility to a three dimensional stroma saturated with phosphorous and calcium salts (a biomaterial replacing bone) are presented. These data suggest that the analysed biomaterial might be used in surgical practices of prosthesis appliance on interfaces of fractured bone. 相似文献
920.
V. D. Taranenko 《Neurophysiology》1984,16(2):119-123
Neuronal responses of an acutely isolated slab of auditory cortex (area AI) to intracortical electrical stimulation were studied intracellularly in cats anesthetized with pentobarbital. It was found that 77% of responses were primary IPSPs, and allowing for secondary inhibitory responses, an inhibitory response was observed in 92% of neurons. All types of neuronal responses in the slab were short-latency. The maximal response latency did not exceed 5 msec. Neurons responding to stimulation by IPSPs were found at all depths in the slab, with a maximum in layers II–III. Nearly all primary IPSPswere mono- and disynaptic. Pentobarbital increased the duration of individual neuronal inhibitory responses in the isolated slab of auditory cortex without affecting maximal duration of the IPSP. The mechanisms of the effect of pentobarbital on the amplitude and duration of IPSPs are discussed.I. I. Mechnikov Odessa State University. Translated from Neirofiziologiya, Vol. 16, No. 2, pp. 147–152, March–April, 1984. 相似文献