首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   1485833篇
  免费   108568篇
  国内免费   2517篇
耳鼻咽喉   20868篇
儿科学   50430篇
妇产科学   39603篇
基础医学   212171篇
口腔科学   38526篇
临床医学   129000篇
内科学   302633篇
皮肤病学   33439篇
神经病学   119590篇
特种医学   57001篇
外国民族医学   715篇
外科学   221310篇
综合类   28031篇
现状与发展   1篇
一般理论   465篇
预防医学   115527篇
眼科学   31710篇
药学   109448篇
  3篇
中国医学   3060篇
肿瘤学   83387篇
  2021年   12156篇
  2019年   13386篇
  2018年   20159篇
  2017年   14741篇
  2016年   15741篇
  2015年   17722篇
  2014年   23217篇
  2013年   35251篇
  2012年   51414篇
  2011年   53475篇
  2010年   30432篇
  2009年   27745篇
  2008年   49318篇
  2007年   52756篇
  2006年   51804篇
  2005年   50470篇
  2004年   48751篇
  2003年   46565篇
  2002年   45228篇
  2001年   67626篇
  2000年   70158篇
  1999年   59719篇
  1998年   15927篇
  1997年   14426篇
  1996年   14789篇
  1995年   14009篇
  1994年   13246篇
  1993年   12223篇
  1992年   46632篇
  1991年   45364篇
  1990年   43988篇
  1989年   41733篇
  1988年   38484篇
  1987年   37674篇
  1986年   34981篇
  1985年   33551篇
  1984年   25116篇
  1983年   21102篇
  1982年   12250篇
  1981年   11107篇
  1979年   22185篇
  1978年   15434篇
  1977年   13092篇
  1976年   12150篇
  1975年   13222篇
  1974年   15411篇
  1973年   14864篇
  1972年   13619篇
  1971年   12358篇
  1970年   11646篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
81.
82.
We report our experience of eight cases of isolated full thickness burns of the penis. Early excision of burns of the penile shaft and repair with a preputial flap or mesh split skin graft produces excellent results, with a reduction in complications and an early re-establishment of sexual function. Conservative treatment of burns of the glans, on the other hand, is appropriate and results in minimal scarring.  相似文献   
83.
The use of additional epidural sympathetic block during and after microvascular surgery in the lower extremities to prevent vasospasm is generally agreed on. However, a significant fall in the perfusion rate of the transplants was seen after application of bupivacaine (Marcain) via the epidural catheter. This effect has, to our knowledge, not been described before and is probably caused by the sympathectomy effect of this type of analgesia.  相似文献   
84.
The present study demonstrates that alcohol-induced memory impairment can be attenuated by pretreatment with an oral tryptophan supplementation. These results provide support for the role of a brain serotonin deficit in this impairment and highlight the impact a dietary manipulation can have on a complex behavioral process.  相似文献   
85.
The Dundee Memory Clinic was established in 1991. This paper reviews the diagnosis of the first 150 attenders and compares the findings with those of other memory clinics.  相似文献   
86.
Macrophage NRAMP1 and its role in resistance to microbial infections   总被引:12,自引:0,他引:12  
  相似文献   
87.
88.
89.
With pulsed X-ray cinematography we have analysed the angular excursions of the distal hindlimb joints (proximal interphalangeal, PIP; metatarsophalangeal, MTP; ankle) in cats walking on a treadmill. These distal joints transmit the body weight and the dynamic forces onto the ground. We have included the knee and hip joints in the analysis to relate the angular excursions of the proximal and distal joints and to verify the data previously obtained with external markers on the kinematics of the proximal joints. At the beginning of the stance phase the PIP joints flexed rapidly, the MTP joints extended slowly and the ankle and knee yielded under body weight. Whereas the PIP joints maintained a rather constant angular position of −75° throughout the stance phase, extension continued in the MTP joints from −230° at touch-down to −270° at the end of the stance phase. Around 50 ms before lift-off the MTP joints flexed rapidly. Early (−30 ms) after lift-off this flexion changed into a slow extension. The PIP joints extended swiftly at the stance-swing transition and moderately at the end of the swing phase. During the middle part of the swing phase they flexed slowly. Small rotatory movements around the long axis of the foot took place in the last 100 ms of the swing phase. The results of this study on the distal joints are discussed in relation to the placing of the paw, to the translation of forward propulsion into a MTP movement and to the lifting of the paw (conventionally described as toe curling). They show a differentiated mechanical interaction between the different distal limb joints during these different phases, which must be known in detail to interpret the corresponding electromyographic data and to understand how the hip is moved forward over the MTP joints which serve as the final pivot during stance.  相似文献   
90.
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号