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   3321篇
  免费   194篇
  国内免费   9篇
耳鼻咽喉   66篇
儿科学   229篇
妇产科学   46篇
基础医学   374篇
口腔科学   123篇
临床医学   231篇
内科学   646篇
皮肤病学   67篇
神经病学   236篇
特种医学   145篇
外科学   513篇
综合类   86篇
一般理论   1篇
预防医学   142篇
眼科学   142篇
药学   230篇
中国医学   17篇
肿瘤学   230篇
  2023年   20篇
  2022年   63篇
  2021年   160篇
  2020年   79篇
  2019年   101篇
  2018年   124篇
  2017年   89篇
  2016年   115篇
  2015年   108篇
  2014年   185篇
  2013年   183篇
  2012年   276篇
  2011年   249篇
  2010年   142篇
  2009年   98篇
  2008年   143篇
  2007年   182篇
  2006年   157篇
  2005年   137篇
  2004年   111篇
  2003年   76篇
  2002年   73篇
  2001年   45篇
  2000年   68篇
  1999年   58篇
  1998年   33篇
  1997年   28篇
  1996年   21篇
  1995年   15篇
  1994年   9篇
  1992年   23篇
  1991年   23篇
  1990年   30篇
  1989年   18篇
  1988年   18篇
  1987年   23篇
  1986年   20篇
  1985年   17篇
  1984年   19篇
  1983年   12篇
  1982年   12篇
  1978年   12篇
  1977年   11篇
  1976年   10篇
  1975年   18篇
  1974年   11篇
  1973年   9篇
  1972年   10篇
  1971年   11篇
  1970年   9篇
排序方式: 共有3524条查询结果,搜索用时 343 毫秒
1.
2.
Reported herein is a case of obsessive–compulsive disorder with persistent and distressing musical obsessions along with other symptoms. Advanced source analysis of electroencephalographic data indicated high spectral power over the bifrontal region. The musical symptoms were resistant to pharmacotherapy but there was some reduction in frequency and duration of musical obsessions with thought-stopping technique.  相似文献   
3.
4.
Defects involving the distal leg and foot are frequently encountered following various aetiological factors. Paucity of local tissue causes surgeons to resort to the retrograde peninsular flap, the cross leg flap or the free flap. With specific knowledge of perforators, the fasciocutaneous flap from the calf area can be transferred to the defect in a single stage based on skeletonised distal perforators. The surgical anatomy, flap planning and procedure have been detailed. Nineteen patients were treated during the period 1995 to 2005. The perforators were identified preoperatively by audio Doppler. The flaps were marked and dissected proximal to the defect skeletonising the distal perforators under loupe magnification and transferred to the defect in a single stage. The donor site was skin grafted. Out of 19 cases, 16 flaps healed uneventfully, one flap necrosed completely and in two cases there was marginal necrosis. The cases were followed up for 2-10 years with an average of 6 years. With detailed knowledge of perforators one can safely reconstruct distal moderate-size defects of the lower limb in a single stage, thus having the benefits of free tissue transfer without resorting to microsurgery. This technique has proved to be an advancement in the reconstructive repertoire allowing flaps of non conventional dimensions to be perfused by skeletonised perforators.  相似文献   
5.
6.
A case of congenital erythropoietic porphyria, with corneoscleral ulceration, a rare association in this disorder, was reported. Anterior segment ischemia is believed to play an important role in the etiopathogenesis of corneoscleral ulceration. Remarkable improvement occurred with use of topical heparin drops (500 units/ml).  相似文献   
7.
8.
We report two full-term infants who developed repetitive focal seizures within the first 48 hours of life. Neither infant had predisposing factors and there were no abnormalities on a computed tomography (CT) scan performed on day 2 of life. Magnetic resonance imaging (MRI) performed during the second week of life showed a focal hemorrhagic infarction in both patients. We conclude that either an MRI or a contrast-enhanced CT scan should be obtained within 1 week in patients in whom the initial imaging technique failed to reveal a focal lesion, at which time a cerebral infarction can be diagnosed with greater sensitivity.  相似文献   
9.
The alterations in the oesophageal epithelium were studied in mice after a single whole-body exposure to 7.5 Gy of Co-60 gamma rays in presence or absence of 2-mercaptopropionyl glycine. The epithelium showed an increase in the thickness which reached a maximum on the third day and then decreased gradually up to seventh day after irradiation in the non-drug treated group. In the 2-mercaptopropionyl glycine treated animals the epithelial thickness remained in the normal range except on the day 7 when it was significantly lower than normal. The total cell population registered a steady decline from one to seven days post-irradiation in both groups, but the number of cells was more in the 2-mercaptopropionyl glycine treated group. The number of pycnotic nuclei showed an inverse relationship to the total cell population, it increased continuously up to seven days in both the protected and non-protected groups. However, pycnotic nuclei were significantly lower in the protected group on days 3, 5 and 7 in non-protected group.  相似文献   
10.
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