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   419759篇
  免费   25003篇
  国内免费   1497篇
耳鼻咽喉   6082篇
儿科学   12137篇
妇产科学   12085篇
基础医学   64700篇
口腔科学   10529篇
临床医学   35718篇
内科学   77973篇
皮肤病学   10205篇
神经病学   31126篇
特种医学   18712篇
外国民族医学   43篇
外科学   62936篇
综合类   8282篇
现状与发展   4篇
一般理论   187篇
预防医学   26479篇
眼科学   10100篇
药学   32103篇
中国医学   2221篇
肿瘤学   24637篇
  2022年   3677篇
  2021年   6567篇
  2020年   3443篇
  2019年   5155篇
  2018年   7229篇
  2017年   5592篇
  2016年   6907篇
  2015年   8843篇
  2014年   10928篇
  2013年   14585篇
  2012年   20103篇
  2011年   20066篇
  2010年   12198篇
  2009年   10755篇
  2008年   16068篇
  2007年   16546篇
  2006年   15705篇
  2005年   14829篇
  2004年   13784篇
  2003年   12612篇
  2002年   11590篇
  2001年   16171篇
  2000年   16255篇
  1999年   13440篇
  1998年   3901篇
  1997年   3427篇
  1996年   3130篇
  1995年   2980篇
  1994年   2719篇
  1992年   9028篇
  1991年   9118篇
  1990年   8863篇
  1989年   8609篇
  1988年   7766篇
  1987年   7517篇
  1986年   7034篇
  1985年   6866篇
  1984年   5007篇
  1983年   4294篇
  1979年   4635篇
  1978年   3387篇
  1977年   2840篇
  1976年   2629篇
  1975年   2949篇
  1974年   3481篇
  1973年   3468篇
  1972年   3217篇
  1971年   3033篇
  1970年   2907篇
  1969年   2637篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
31.
Pharmaceutical Chemistry Journal - Three extracts were produced from the above-ground part of the meadowsweet Filipendula ulmaria (L.) Maxim. using water, 40% ethanol, and 70% ethanol. Comparative...  相似文献   
32.
The identification of EGFR mutations in non‐small‐cell lung cancer is important for selecting patients, who may benefit from treatment with EGFR tyrosine kinase inhibitors. The analysis is usually performed on cytological aspirates and/or histological needle biopsies, representing a small fraction of the tumour volume. The aim of the present investigation was to evaluate the diagnostic performance of this molecular test. We retrospectively included 201 patients with primary adenocarcinoma of the lung. EGFR mutation status (exon 19 deletions and exon 21 L858R point mutation) was evaluated on both pre‐operative biopsies (131 histological and 70 cytological) and on the surgical specimens, using PCR. Samples with low tumour cell fraction were assigned to laser micro‐dissection (LMD). We found nine (4.5%) patients with EGFR mutation in the lung tumour resections, but failed to identify mutation in one of the corresponding pre‐operative, cytological specimens. Several (18.4%) analyses of the pre‐operative biopsies were inconclusive, especially in case of biopsies undergoing LMD and regarding exon 21 analysis. Discrepancy of mutation status in one patient may reflect intra‐tumoural heterogeneity or technical issues. Moreover, several inconclusive results in the diagnostic biopsies reveal that attention must be paid on the suitability of pre‐operative biopsies for EGFR mutation analysis.  相似文献   
33.
34.
A 48-year-old smoker with a history of hyperthyroidism treated 10 years prior to presentation with radioactive iodine ablation of the thyroid gland presented to his ophthalmologist with a 2-week history of transient loss of vision in the right eye occurring for 1 to 2 hours each morning. He denied ocular pain, diplopia or change in the prominence of one or both eyes. Examination revealed 2 mm of relative proptosis on the right, bilateral temporal flare and lower lid retraction. There was minimal upper lid retraction and no evidence of lid lag. Ocular motility was full. Dilated fundoscopic examination revealed bilateral optic nerve edema, right more than left. CT of the orbit demonstrated enlargement of the extraocular muscles bilaterally with marked enlargement of the right medial rectus and left inferior rectus muscles resulting in crowding at the orbital apex bilaterally. Laboratory testing revealed the patient to be hyperthyroid. The patient was treated with high dose oral steroids followed by orbital radiation. Hyperthyroidism was managed by the patient’s primary care physician. Visual symptoms rapidly improved with oral steroids and orbital radiation. Optic nerve edema completely resolved. Repeat CT imaging demonstrated a reduction in the enlargement of the extraocular muscles with relief of bilateral optic nerve compression.  相似文献   
35.
36.
European Journal of Orthopaedic Surgery & Traumatology - The goals of this study were to compare patient satisfaction and wound-related complications in patients receiving 2-octyl cyanoacrylate...  相似文献   
37.
38.
39.
Synovial chondromatosis is a rare lesion in the wrist, but some cases in the distal radioulnar joint have been reported and previous case reports emphasize joint calcifications, shown on preoperative plain radiographs. We report an extremely uncommon case of synovial chondromatosis in the pisotriquetral joint, in which radiographs and magnetic resonance imaging did not demonstrate apparent calcified bodies. In our case, for the accurate diagnosis and treatment, surgical exploration of the joint and synovectomy with removal of loose bodies was performed.  相似文献   
40.
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