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   158049篇
  免费   31633篇
  国内免费   2394篇
耳鼻咽喉   5202篇
儿科学   5750篇
妇产科学   2654篇
基础医学   3820篇
口腔科学   1500篇
临床医学   28012篇
内科学   48186篇
皮肤病学   7567篇
神经病学   15452篇
特种医学   6517篇
外科学   41519篇
综合类   299篇
现状与发展   72篇
一般理论   8篇
预防医学   8364篇
眼科学   3401篇
药学   1341篇
中国医学   9篇
肿瘤学   12403篇
  2024年   696篇
  2023年   4854篇
  2022年   1246篇
  2021年   3224篇
  2020年   6120篇
  2019年   2371篇
  2018年   7542篇
  2017年   7467篇
  2016年   8537篇
  2015年   8558篇
  2014年   15701篇
  2013年   15999篇
  2012年   6021篇
  2011年   6081篇
  2010年   10659篇
  2009年   14487篇
  2008年   6312篇
  2007年   4573篇
  2006年   6977篇
  2005年   4271篇
  2004年   3499篇
  2003年   2422篇
  2002年   2482篇
  2001年   3823篇
  2000年   3029篇
  1999年   3240篇
  1998年   3735篇
  1997年   3522篇
  1996年   3413篇
  1995年   3266篇
  1994年   1972篇
  1993年   1604篇
  1992年   1399篇
  1991年   1429篇
  1990年   1079篇
  1989年   1193篇
  1988年   1027篇
  1987年   871篇
  1986年   908篇
  1985年   732篇
  1984年   562篇
  1983年   530篇
  1982年   526篇
  1981年   413篇
  1980年   375篇
  1979年   311篇
  1978年   335篇
  1977年   406篇
  1975年   281篇
  1972年   314篇
排序方式: 共有10000条查询结果,搜索用时 10 毫秒
81.
82.
As the proportion of racial, ethnic, and cultural minorities in the United States continues to expand, pediatric emergency medicine providers are increasingly likely to encounter cultural and language barriers in practice. This paper reviews a conceptual framework encompassing the decision to seek emergency care, the process of providing such care, and the adherence to treatment plans and follow-up. The ways in which cultural and language barriers can negatively impact each element of this model are discussed in detail. Specific examples include provider ignorance of dangerous folk beliefs, communication barriers secondary to inappropriate interpreter use, and discriminatory assumptions regarding child abuse, pain management, and sexual activity. The practitioner is then provided with concrete recommendations to reduce these negative effects.  相似文献   
83.
Acute myelogenous leukemia (AMU is a hematologic disorder that is characterized by an abnormal proliferation of immature myeloid cells. Granulocytic sarcomas are clusters of leukemic myeloid cells that may develop as a result of AML. Oral manifestations of AML are common and often involve enlargements of the gingiva and/or mucosal tissue from direct leukemia cell infiltration. We describe the case history of a 50-year-old man who had an ulcera-tive lesion of the oral mucosa that was determined to be a granulocytic sarcoma of AML-M0 subtype. The combination of both the subtype and clinical presentation of the leukemia makes this presentation unusual, and to the best of our knowledge, of a type that has not been previously reported in the literature.  相似文献   
84.
85.
BACKGROUND: Previous data indicate that injections of autologous fibroblasts increase collagen formation, accompanied by a concomitant increase in thickness and density of dermal collagen. OBJECTIVE: The purpose of this study was to determine efficacy and side effects of autologous living fibroblast injections versus placebo in a randomized Phase III trial for the treatment of various facial contour defects. METHODS: This was a double-blind, randomized comparison of injectable living autologous fibroblast cells and placebo for the treatment of facial contour defects (N=215). Live fibroblasts (20 million/mL) or placebo (the transport medium without living cells) were given as three doses administered at 1- to 2-week intervals. Efficacy evaluations were performed 1, 2, 4, 6, 9, and 12 months after the first injection. RESULTS: Living fibroblasts produced statistically significantly greater improvements in dermal deformities and acne scars than did placebo. The difference between live fibroblast injections and placebo achieved statistical significance at 6 months (p<.0001). At 9- and 12-month follow-up, live fibroblast-treated patients continued to demonstrate benefit from treatment with response rates of 75.0 and 81.6%, respectively. No serious treatment-related adverse events were reported. CONCLUSIONS: Our results indicate that autologous fibroblast injections can safely and effectively produce improvements in rhytids, acne scars, and other dermal defects continuing for at least 12 months after injection.  相似文献   
86.
87.
88.
89.
90.
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