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   577篇
  免费   11篇
  国内免费   1篇
儿科学   18篇
妇产科学   9篇
基础医学   86篇
口腔科学   7篇
临床医学   57篇
内科学   58篇
皮肤病学   6篇
神经病学   13篇
特种医学   15篇
外科学   198篇
综合类   2篇
一般理论   1篇
预防医学   73篇
眼科学   10篇
药学   12篇
中国医学   1篇
肿瘤学   23篇
  2023年   2篇
  2022年   10篇
  2021年   17篇
  2020年   10篇
  2019年   73篇
  2018年   176篇
  2017年   32篇
  2016年   11篇
  2015年   8篇
  2014年   12篇
  2013年   22篇
  2012年   11篇
  2011年   11篇
  2010年   13篇
  2009年   9篇
  2008年   11篇
  2007年   14篇
  2006年   11篇
  2005年   10篇
  2004年   8篇
  2003年   4篇
  2002年   8篇
  2001年   1篇
  2000年   10篇
  1999年   6篇
  1998年   4篇
  1997年   7篇
  1996年   8篇
  1995年   3篇
  1994年   2篇
  1993年   1篇
  1992年   4篇
  1991年   7篇
  1990年   1篇
  1989年   1篇
  1987年   1篇
  1986年   1篇
  1985年   4篇
  1984年   5篇
  1983年   6篇
  1982年   8篇
  1981年   4篇
  1980年   2篇
  1979年   1篇
  1978年   1篇
  1977年   5篇
  1976年   4篇
  1975年   2篇
  1974年   5篇
  1973年   2篇
排序方式: 共有589条查询结果,搜索用时 15 毫秒
1.
Summary Of the 105 great cormorants (Phalacrocorax carbo sinensins) from northern Poland (the Vistula Lagoon and Masurian Lake District), examined in 2000–2001, 67 proved hosts of the nematode Syncuaria squamata (Linstow, 1883). The prevalence, mean intensity, and intensity range amounted to 63.8 %, 36.2 specimens, and 1–120 specimens, respectively. The infection was heavier in the immature birds (84.6 %, 40.9 inds, and 1–120 inds) than in the adults (3.7 %, 1 ind.). The nematodes were dominated by gravid females (n=1846), followed by males (n=157), immature females (n=79), and L4 larvae (n=2). Measurements of the parasite are provided. S. squamata is a new species for the parasite fauna of Poland.  相似文献   
2.
Summary During studies on the helminth fauna of wolves inhabiting natural ecosystems of Poland, 86 scats were examined. All the samples were collected in the autumn of 2005. Spirocerca lupi was detected with decantation and flotation techniques. The prevalence was 2.32 %. This is the first record of the parasite from Poland and the third case of its occurrence in the wolf (Canis lupus L.) within its distribution range.  相似文献   
3.
Ureteropelvic junction obstruction was noted in a newborn male infant with acro-pectoro-renal field defect. To our knowledge, this association has not previously been reported. Ultrasonography of the urinary tract should be performed on all children with aplasia of the pectoralis major muscle.  相似文献   
4.
5.
6.
A 22-year-old male college student had a syndactyly between the second and third fingers of his left hand, which was congenitally small in size. His left pectoralis muscles were absent. He first walked at the age of 12 months, but soon developed difficulties in walking due to weakness of the legs. Atrophy and weakness of the legs aggravated gradually. He was diagnosed as having peroneal muscular atrophy and Poland syndrome, an association of which has not been reported before. A small number of similar cases of peroneal muscular atrophy with various skeletal abnormalities in the literature suggest that the association is not incidental, but of clinical significance.  相似文献   
7.
Gluteal and lower extremity hypoplasia with ipsilateral toe brachysyndactyly were noted in a 23-year-old woman similarly affected to the only previously reported case of the lower extremity counterpart of Poland sequence. Since no neurological deficit was found, and electromyographic and nerve conduction studies in the affected limb were normal, we propose a vascular origin which would involve the external iliac artery supply analogous to the subclavian artery supply disruption in the upper extremity Poland sequence.  相似文献   
8.
9.
Three male specimens of the eyeworm, Oxyspirura chabaudi, were found during the post mortem examination of one individual of Turdus merula L. (Passeriformes). This is the first record of Turdus merula as a host for O. chabaudi.  相似文献   
10.
We describe a female infant with apparent Poland anomaly (PA) and limb body wall defect. Analysis of the defects suggest that a disruption of the lateral embryonic plate mesoderm may have been responsible for the observed lesions. Because of the overlap of this case with PA, we re-examined previous reports of this syndrome. We think that the lesions could be equally well explained as a mesodermal disruption, and point out a previously unrecognised discrepancy between sex and affected side in sporadic PA and inherited PA which supports this view. © 1992 Wiley-Liss, Inc.  相似文献   
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