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   150876篇
  免费   31223篇
  国内免费   2403篇
耳鼻咽喉   5162篇
儿科学   5379篇
妇产科学   2421篇
基础医学   3188篇
口腔科学   1473篇
临床医学   26658篇
内科学   47386篇
皮肤病学   7450篇
神经病学   14800篇
特种医学   6327篇
外科学   40878篇
综合类   241篇
现状与发展   72篇
一般理论   1篇
预防医学   7029篇
眼科学   3347篇
药学   935篇
中国医学   11篇
肿瘤学   11744篇
  2024年   693篇
  2023年   4791篇
  2022年   1199篇
  2021年   3093篇
  2020年   6035篇
  2019年   2150篇
  2018年   7385篇
  2017年   7321篇
  2016年   8430篇
  2015年   8409篇
  2014年   15488篇
  2013年   15605篇
  2012年   5456篇
  2011年   5501篇
  2010年   10345篇
  2009年   14249篇
  2008年   5787篇
  2007年   4025篇
  2006年   6476篇
  2005年   3750篇
  2004年   3013篇
  2003年   1987篇
  2002年   2075篇
  2001年   3779篇
  2000年   2993篇
  1999年   3204篇
  1998年   3637篇
  1997年   3464篇
  1996年   3360篇
  1995年   3208篇
  1994年   1937篇
  1993年   1560篇
  1992年   1370篇
  1991年   1408篇
  1990年   1054篇
  1989年   1178篇
  1988年   1012篇
  1987年   854篇
  1986年   888篇
  1985年   713篇
  1984年   550篇
  1983年   521篇
  1982年   519篇
  1981年   401篇
  1980年   366篇
  1979年   308篇
  1978年   331篇
  1977年   399篇
  1975年   283篇
  1972年   304篇
排序方式: 共有10000条查询结果,搜索用时 16 毫秒
71.
72.
73.
74.
75.
76.
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   
77.
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   
78.
79.
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   
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