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   3488篇
  免费   168篇
  国内免费   15篇
耳鼻咽喉   60篇
儿科学   297篇
妇产科学   52篇
基础医学   313篇
口腔科学   133篇
临床医学   300篇
内科学   711篇
皮肤病学   70篇
神经病学   146篇
特种医学   154篇
外科学   433篇
综合类   141篇
预防医学   165篇
眼科学   98篇
药学   356篇
中国医学   30篇
肿瘤学   212篇
  2023年   45篇
  2022年   118篇
  2021年   154篇
  2020年   86篇
  2019年   94篇
  2018年   160篇
  2017年   106篇
  2016年   135篇
  2015年   134篇
  2014年   178篇
  2013年   209篇
  2012年   255篇
  2011年   277篇
  2010年   158篇
  2009年   117篇
  2008年   133篇
  2007年   137篇
  2006年   131篇
  2005年   109篇
  2004年   77篇
  2003年   89篇
  2002年   60篇
  2001年   59篇
  2000年   51篇
  1999年   35篇
  1998年   46篇
  1997年   46篇
  1996年   23篇
  1995年   21篇
  1994年   27篇
  1993年   16篇
  1992年   23篇
  1991年   32篇
  1990年   31篇
  1989年   34篇
  1988年   44篇
  1987年   27篇
  1986年   26篇
  1985年   29篇
  1984年   8篇
  1983年   11篇
  1981年   9篇
  1980年   5篇
  1979年   23篇
  1978年   22篇
  1977年   10篇
  1976年   6篇
  1973年   5篇
  1969年   10篇
  1968年   5篇
排序方式: 共有3671条查询结果,搜索用时 10 毫秒
51.

Background:

To evaluate and compare the ultrasound (US) features of transient small bowel intussusception (SBI) with those which required surgical management.

Materials and Methods:

US features of 26 children with 32 intussusceptions from January 2014 to August 2014 were recorded and compared with follow-up imaging or surgical findings.

Results:

Transient SBI when compared to surgically managed intussusception has shorter length of intussusception (mean 2.25 cm, range 1.8-4.5 cm vs. mean 5.6 cm, range, 2.3-7.8 cm), smaller transverse diameter (mean, 1.2 cm, range 0.8-2.3 cm vs. mean, 3.3 cm, range 2.9-5.4 cm) and thin wall (mean, 3.3 mm, 2.3-4.9 mm vs. mean, 6.8 mm, range, 4.3-11.2 mm). Four out of five surgically managed intussusceptions were associated with the lead point while none of the transient SBI had any lead point. Peristalsis was absent in all surgically managed intussusceptions.

Conclusion:

Transient SBI is associated with a shorter length of intussusception, smaller transverse diameter, thin walls, absence of the lead point and visible peristalsis. All these findings may help in distinguishing it from those requiring surgical management.Key words: Children, surgically managed small bowel intussusception, transient small bowel intussusception, ultrasound  相似文献   
52.
Oviposition deterrent activity of three mosquito repellents namely diethyl phenyl acetamide (DEPA), diethyl benzamide (DEB) along with diethyl toluamide (DEET) was studied in the laboratory against Aedes aegypti, A. albopictus, and Culex quinquefasciatus mosquitoes. All the repellents evaluated at three log concentrations 0.1, 0.01, and 0.001 % in comparison with control by dual choice method. The oviposition response and oviposition activity index (OAI) was estimated by counting number of eggs laid in both the treatment and control. Mean OAI determined for A. aegypti was in the range of ?0.23 to +0.22, ?0.3 to +0.27, and +0.04 to +0.33 for DEPA, DEET, and DEB, respectively, whereas it was ?0.77 to ?0.035, ?0.92 to +0.001, and ?0.77 to ?0.07 for A. albopictus and ?0.927 to ?0.251, ?1 to ?0.41, and ?0.94 to ?0.17 for C. quinquefasciatus. The oviposition deterrent activity was observed in the order of DEET > DEPA > DEB. Similarly, the response of species toward the repellents as oviposition deterrent was in the trend of C. quinquefasciatus > A. albopictus > A. aegypti. The finding suggests potential role of mosquito repellents as oviposition deterrent.  相似文献   
53.
We report a case of a 65-year-old female diagnosed with sever dengue fever. She started showing recovery from dengue fever with medical management. On day 6 of admission, she had leukocytosis, altered mental sensorium, and hemoptysis. Chest tomography showed air space consolidation with multiple nodules in the left upper and middle lobe sputum and bronchoalveolar lavage cultures were positive for Aspergillus flavus. The patient showed improvement with voriconazole and therapy was continued for 6 weeks.  相似文献   
54.
55.
56.
57.
58.
59.
60.
Gingival recession beyond grade III and grade IV level involving furcation defects can lead to tooth loss if not intervened at appropriate time. The treatment options include scaling and root planing, Furcation-plasty, Tunnel preparation, Root separation and resection. The chief complaint of the patient was pain in the upper left first molar because of grade III furcation involvement. Since it was a four rooted molar, the treatment of choice was hemisection of the tooth and extraction of the distal half following endodontic treatment. As the second molar was mesially tilted the prosthodontic rehabilitation was done with a hybrid prosthesis involving a full coverage conventional porcelain fused to metal retainer on the hemisected molar and a resin bonded partial coverage retainer on the tilted second molar. The resultant prosthesis is termed as "Hybrid prosthesis".  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