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   185953篇
  免费   32799篇
  国内免费   2584篇
耳鼻咽喉   5572篇
儿科学   5998篇
妇产科学   2713篇
基础医学   7616篇
口腔科学   2502篇
临床医学   29048篇
内科学   55872篇
皮肤病学   8074篇
神经病学   17470篇
特种医学   7678篇
外科学   46591篇
综合类   464篇
现状与发展   72篇
预防医学   8161篇
眼科学   3982篇
药学   3961篇
中国医学   100篇
肿瘤学   15462篇
  2024年   700篇
  2023年   4945篇
  2022年   1544篇
  2021年   3686篇
  2020年   6293篇
  2019年   2576篇
  2018年   7926篇
  2017年   7761篇
  2016年   8959篇
  2015年   9012篇
  2014年   16217篇
  2013年   16571篇
  2012年   6936篇
  2011年   7135篇
  2010年   11282篇
  2009年   15020篇
  2008年   7205篇
  2007年   5516篇
  2006年   8017篇
  2005年   5443篇
  2004年   4608篇
  2003年   3574篇
  2002年   3733篇
  2001年   5037篇
  2000年   4396篇
  1999年   4437篇
  1998年   4118篇
  1997年   3835篇
  1996年   3734篇
  1995年   3516篇
  1994年   2250篇
  1993年   1863篇
  1992年   2204篇
  1991年   2153篇
  1990年   1796篇
  1989年   1966篇
  1988年   1728篇
  1987年   1502篇
  1986年   1498篇
  1985年   1291篇
  1984年   1007篇
  1983年   859篇
  1982年   712篇
  1981年   561篇
  1980年   537篇
  1979年   600篇
  1978年   567篇
  1977年   579篇
  1975年   417篇
  1972年   447篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
91.
92.
93.
Three patients with dysphagia caused by compression of the distal esophagus by a tortuous nonaneurysmal atherosclerotic aorta are described. All three patients were elderly women; systemic hypertension and cardiomegaly were present in two patients. Barium studies of the esophagus showed displacement and compression of the distal esophagus by the thoracic aorta. Debilitating dysphagia was treated surgically in one patient. The other two patients had milder symptoms and were managed conservatively. Esophageal manometry in these three patients showed superimposed pulsations and elevated intraluminal pressure just proximal to the lower esophageal sphincter. To evaluate the significance of these manometric findings and their correlation with clinical symptoms, we reviewed manometric tracings in 47 normal subjects. Ten of these subjects had an elevation of baseline intraluminal esophageal pressure as a result of superimposed vascular pulsations. We conclude that (1) compression of the distal esophagus by a tortuous atherosclerotic aorta in the appropriate setting can lead to clinically significant dysphagia and (2) a manometric finding of vascular compression of the esophagus does not necessarily correlate symptomatic dysphagia.  相似文献   
94.
95.
MICHELLE EHRLICH  MD    JAGGI RAO  MD    ANJU PABBY  MD    MITCHEL P. GOLDMAN  MD 《Dermatologic surgery》2006,32(5):618-625
BACKGROUND AND OBJECTIVE: Facial rhytides are a common cosmetic concern. Surgical treatment effects dramatic improvement; however, the associated risk and cost may be prohibitive. Recent focus is on developing topical products containing biologically active ingredients for at-home therapy. Our study examines the effects of a topical cream containing transforming growth factor-beta(1) (TGF-beta(1)), l-ascorbic acid, and Cimicifuga racemosa extract (CRS) (Topix Pharmaceuticals, North Amityville, NY, USA). MATERIALS AND METHODS: In the first arm of the study, 12 subjects were randomized to apply CRS to the left or right side of their face and a cream containing l-ascorbic acid and C. racemosa in silicone base (vitamin C [Vit C]) to the contralateral side twice daily for 3 months. In the second arm of the study, 20 subjects were randomized to apply CRS to the left or right side of their face and Tissue Nutrient Solution Recovery Complex (TNS) (SkinMedica, Carlsbad, CA, USA), a product containing a variety of growth factors including VEGF, PDGF-A, G-CSF, HGF, IL-6, IL-8, and TGF-beta(1) (Nouricel-MD) without l-ascorbic acid, C. racemosa extract, or silicone base, to the contralateral side of their face twice daily for 3 months. Digital photographs were scored by study-blinded physicians, and self-assessments were completed by all subjects at baseline and at the conclusion of the protocol. RESULTS: CRS and TNS were well tolerated, and all subjects completed the 3-month protocol for the CRS versus Vit C arm of the study. Physicians rated success in facial wrinkling scores on the CRS-treated side of the face for 27 of 31 subjects. Responders showed, on average, 21.7% improvement in physician-rated wrinkle scores. The mean improvement in the group of 31 patients as a whole was 12%. Eighteen of 31 subjects reported a noticeable improvement on their CRS-treated side. Both CRS and TNS demonstrate significant success between baseline and 3-month scores, and both growth factor products are superior to Vit C. Patients preferred CRS over TNS. CONCLUSION: CRS is effective in minimizing the appearance of facial rhytides. The success of the CRS product is largely attributable to the incorporation of TGF-beta(1).  相似文献   
96.
97.
98.
99.
100.
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