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   178817篇
  免费   11632篇
  国内免费   705篇
耳鼻咽喉   2503篇
儿科学   4883篇
妇产科学   3437篇
基础医学   23203篇
口腔科学   3549篇
临床医学   17517篇
内科学   38338篇
皮肤病学   2803篇
神经病学   17957篇
特种医学   6221篇
外国民族医学   13篇
外科学   26523篇
综合类   2302篇
现状与发展   3篇
一般理论   201篇
预防医学   13299篇
眼科学   4782篇
药学   11516篇
中国医学   203篇
肿瘤学   11901篇
  2023年   697篇
  2022年   1220篇
  2021年   2866篇
  2020年   1761篇
  2019年   2888篇
  2018年   3402篇
  2017年   2460篇
  2016年   2863篇
  2015年   3457篇
  2014年   5110篇
  2013年   7883篇
  2012年   11397篇
  2011年   12251篇
  2010年   6842篇
  2009年   6314篇
  2008年   11536篇
  2007年   12308篇
  2006年   11813篇
  2005年   12166篇
  2004年   11560篇
  2003年   11033篇
  2002年   10640篇
  2001年   1491篇
  2000年   1133篇
  1999年   1591篇
  1998年   2333篇
  1997年   2020篇
  1996年   1702篇
  1995年   1582篇
  1994年   1424篇
  1993年   1352篇
  1992年   1042篇
  1991年   955篇
  1990年   835篇
  1989年   817篇
  1988年   838篇
  1987年   718篇
  1986年   835篇
  1985年   916篇
  1984年   1223篇
  1983年   1174篇
  1982年   1639篇
  1981年   1513篇
  1980年   1417篇
  1979年   788篇
  1978年   906篇
  1977年   800篇
  1976年   707篇
  1975年   566篇
  1974年   594篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
41.
42.
43.
44.
Dermatophyte infections are exceedingly rare in neonates, possibly due to the thin stratum corneum and high sebum content of neonatal skin. Only a handful of cases of tinea faciei have been reported in neonates, with the majority of reports occuring in India. Here, we report what to our knowledge is the earliest reported presentation of tinea faciei in the United States. We also provide a brief literature review of other reported cases of tinea faciei in neonates less than 30 days of age.  相似文献   
45.

Introduction

In the United States there has been a large increase in participation in lacrosse for both males and females. The purpose of this study was to analyze the number of head injuries, injury rates (calculated using the reported number of participants) and types of head injuries that are seen in emergency departments in the United States.

Methods

We compared injuries between male and female lacrosse participants. This was a retrospective study using a publicly available database produced by the US Consumer Product Safety Commission and information about lacrosse participation from US Lacrosse.

Results

A linear regression was performed and showed a positive correlation between number of head injuries to males and time from 2002 to 2010 (R2?=?0.823; p?=?0.001). While the number of injuries to the head in female lacrosse participants was not significant. There was a negative correlation between the number of head injuries to males from 2010 to 2016 (R2?=?0.800; p?=?0.007), but again, there was no significance for female injury count (R2?=?0.417; p?=?0.117). Other significant differences between head injuries in males and females included the mechanism of injury and the type of injury recorded.

Conclusion

The most recent data from 2010 to 2016, suggest that both males and females have had a decrease in injury rate. However the total number of female head injuries is not significantly decreasing and as the sport continues to grow there will likely be more total head injuries and visits to the emergency department.  相似文献   
46.
The presented case reports on successful treatment with everolimus in a neonate with left ventricular giant rhabdomyoma. The authors used a different dosage regime compared to literature and documented rapid tumor regression by 3D echocardiography.  相似文献   
47.
Risk is a concept inherent in every medical procedure. It can be defined as the probability of an adverse event in a defined population over a specified period of time. In the frame of food allergy management, it might be related to a diagnostic procedure, a treatment, or the consumption of foods. The risk of an adverse event can also be augmented by individual factors. This rostrum article discusses various aspects faced by children with food allergies in the light of risk, and their practical implications. Identifying personal risks for severe reaction, such as unstable asthma, and correcting them whenever possible also contribute to a reduction of the risk inherent to food allergy. Among the facets discussed, oral food challenges (OFC) are the most common diagnostic procedures implying an inherent risk. The risk of OFCs can be minimized by correct indication and timing of the test, a safe setting, as well as by ensuring that the patient is otherwise well without potential stressor potentially increasing the risk of a more severe reaction. Oral immunotherapy (OIT) has been studied as a potential treatment for increasing the threshold dose for reaction, and thus reducing the risk of accidental reaction. Nevertheless, the procedure is not devoid of risk as the patients may and do often react during the course of the procedure. Ingestion of trace amounts in processed foods, mainly in community settings such as restaurants, schools, or day care, represents a potential risk of reactions, although for a minority of patients. Precautionary allergen labeling (PAL) is a widespread strategy to reduce the potential risk of reactions due to traces. However, PAL is currently inefficient due to inconsistent labeling, also not indicating a clear maximum amount possibly present in the manufactured food. Finally, cost-effectiveness needs to be considered in risk management, as many risk reduction procedures are clearly not cost-effective.  相似文献   
48.
The intention of this article is to introduce the reader to the Transograph from a historical perspective. The technical data presented are intended to help the reader understand the design of this unique instrument and how it was programmed, but will not provide the reader a thorough understanding of this philosophy. The article seeks neither to defend nor criticize the principles of Transographics.  相似文献   
49.
50.
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