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   150478篇
  免费   31177篇
  国内免费   2389篇
耳鼻咽喉   5199篇
儿科学   5332篇
妇产科学   2373篇
基础医学   2963篇
口腔科学   1483篇
临床医学   26528篇
内科学   47415篇
皮肤病学   7413篇
神经病学   14993篇
特种医学   6359篇
外科学   40818篇
综合类   230篇
现状与发展   72篇
预防医学   6926篇
眼科学   3316篇
药学   910篇
中国医学   6篇
肿瘤学   11708篇
  2024年   747篇
  2023年   5099篇
  2022年   1454篇
  2021年   3097篇
  2020年   6018篇
  2019年   2128篇
  2018年   7357篇
  2017年   7318篇
  2016年   8392篇
  2015年   8370篇
  2014年   15451篇
  2013年   15550篇
  2012年   5369篇
  2011年   5382篇
  2010年   10293篇
  2009年   14183篇
  2008年   5697篇
  2007年   3924篇
  2006年   6394篇
  2005年   3667篇
  2004年   2950篇
  2003年   1933篇
  2002年   2008篇
  2001年   3787篇
  2000年   3005篇
  1999年   3207篇
  1998年   3641篇
  1997年   3458篇
  1996年   3359篇
  1995年   3202篇
  1994年   1936篇
  1993年   1557篇
  1992年   1381篇
  1991年   1407篇
  1990年   1058篇
  1989年   1186篇
  1988年   1013篇
  1987年   856篇
  1986年   887篇
  1985年   721篇
  1984年   551篇
  1983年   524篇
  1982年   515篇
  1981年   401篇
  1980年   363篇
  1979年   313篇
  1978年   332篇
  1977年   398篇
  1975年   282篇
  1972年   303篇
排序方式: 共有10000条查询结果,搜索用时 36 毫秒
71.
72.
73.
74.
75.
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   
76.
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   
77.
78.
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   
79.
80.
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