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   218050篇
  免费   35415篇
  国内免费   2544篇
耳鼻咽喉   5627篇
儿科学   7159篇
妇产科学   3502篇
基础医学   12657篇
口腔科学   2950篇
临床医学   33493篇
内科学   61197篇
皮肤病学   8324篇
神经病学   21200篇
特种医学   8423篇
外国民族医学   1篇
外科学   50177篇
综合类   1103篇
现状与发展   72篇
一般理论   72篇
预防医学   13137篇
眼科学   4997篇
药学   5721篇
  1篇
中国医学   86篇
肿瘤学   16110篇
  2024年   720篇
  2023年   5075篇
  2022年   1667篇
  2021年   4379篇
  2020年   6714篇
  2019年   3425篇
  2018年   8872篇
  2017年   8409篇
  2016年   9572篇
  2015年   9786篇
  2014年   17548篇
  2013年   18468篇
  2012年   10463篇
  2011年   10604篇
  2010年   13085篇
  2009年   16557篇
  2008年   10432篇
  2007年   9129篇
  2006年   11476篇
  2005年   8538篇
  2004年   7599篇
  2003年   6159篇
  2002年   6162篇
  2001年   4262篇
  2000年   3343篇
  1999年   3765篇
  1998年   4454篇
  1997年   4117篇
  1996年   3909篇
  1995年   3732篇
  1994年   2393篇
  1993年   1997篇
  1992年   1687篇
  1991年   1679篇
  1990年   1282篇
  1989年   1396篇
  1988年   1257篇
  1987年   1051篇
  1986年   1100篇
  1985年   944篇
  1984年   847篇
  1983年   832篇
  1982年   883篇
  1981年   760篇
  1980年   699篇
  1979年   497篇
  1978年   564篇
  1977年   586篇
  1975年   377篇
  1972年   372篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
81.
82.
83.
84.
85.
86.
87.
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   
88.
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   
89.
90.
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   
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