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   1571820篇
  免费   112754篇
  国内免费   5543篇
耳鼻咽喉   20886篇
儿科学   51676篇
妇产科学   43590篇
基础医学   232192篇
口腔科学   43178篇
临床医学   147467篇
内科学   300698篇
皮肤病学   32328篇
神经病学   131461篇
特种医学   59009篇
外国民族医学   390篇
外科学   221958篇
综合类   33474篇
现状与发展   1篇
一般理论   530篇
预防医学   127967篇
眼科学   35068篇
药学   116630篇
  6篇
中国医学   4049篇
肿瘤学   87559篇
  2021年   12694篇
  2019年   13488篇
  2018年   19906篇
  2017年   15139篇
  2016年   16949篇
  2015年   19389篇
  2014年   25483篇
  2013年   38532篇
  2012年   54050篇
  2011年   56438篇
  2010年   32767篇
  2009年   29609篇
  2008年   51924篇
  2007年   55215篇
  2006年   55304篇
  2005年   53775篇
  2004年   51219篇
  2003年   48944篇
  2002年   47622篇
  2001年   70687篇
  2000年   72630篇
  1999年   61039篇
  1998年   17378篇
  1997年   15458篇
  1996年   14642篇
  1995年   13800篇
  1994年   12870篇
  1993年   12106篇
  1992年   46360篇
  1991年   45593篇
  1990年   43989篇
  1989年   41845篇
  1988年   38750篇
  1987年   37749篇
  1986年   35948篇
  1985年   34327篇
  1984年   25742篇
  1983年   21870篇
  1982年   13097篇
  1979年   23556篇
  1978年   16638篇
  1977年   13614篇
  1976年   13271篇
  1975年   14022篇
  1974年   16898篇
  1973年   16578篇
  1972年   15398篇
  1971年   14336篇
  1970年   13208篇
  1969年   12095篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
101.
In 1963, Goffman argued that forming a group based on shared stigma may provide benefits. However, there is no empirical research on whether perception that a separate, unique, coherent group exists (i.e., group entitativity) influences coping, such as educating others or secrecy, for the stigmatized individual or his or her spouse. Further, little is known about how spouses influence each other in terms of promoting the education of others about a stigmatizing condition, especially when it comes to the role of believing that stigma-based groups, to which they may both belong, exist. This study provides a step toward bridging this gap in the research by applying the label management model in efforts to understand coping for couples in which one spouse is diagnosed with genetic mutations leading to alpha-1 antitrypsin deficiency (AATD). This study included 50 married couples in which one spouse is diagnosed with genetic mutations leading to alpha-1 antitrypsin deficiency (AATD). We found that group entitativity related to those with AATD counterbalanced the influence of genetic stigma on spouses’ intentions to keep the diagnosis secret or to educate others about it. Intrapersonal and interpersonal influences appeared among spouses. Attention is needed on the power of creating groups for stigmatized persons and their relatives. Indeed, people live within a dynamic world of group entities, and multiple social identities including spousal and familial. While attention has been paid to the diffusion of stigmas to loved ones, less has been paid to the uplift of group entities for them.  相似文献   
102.
103.
104.
105.
ABSTRACT

Domestic chickens (Gallus gallus domesticus) were exposed to imidacloprid by gavage once daily for 7 consecutive days at 0, 0.03, 0.34, 3.42, 10.25, and 15.5 mg/kg/day (n = 20 per group; 5 6-week-old males, 5 6-week-old females, 5 9-week-old males, and 5 9-week-old females). The severity and duration of neurobehavioral abnormalities were recorded. Components of the innate and adaptive immune system were assessed with 7 standard functional assays. Temporary neurobehavioral abnormalities were observed in a dose-dependent manner, including muscle tremors, ataxia, and depressed mentation. Based upon mean clinical severity scores, the no observed adverse effect level (NOAEL) was 3.42 mg/kg/day, and the lowest observed adverse effect level (LOAEL) was 10.25 mg/kg/day. The effective dose value for the presence of any neurobehavioral abnormalities in 50% of the test group (ED50) was 4.62 ± 0.98 mg/kg/day. The ED50 for an adjusted score that included both severity and duration of neurobehavioral abnormalities was 11.24 ± 9.33 mg/kg/day. These ED50 values are equivalent to a 1 kg bird ingesting 29 or 70 imidacloprid treated soybean seeds respectively. Immunotoxicity was not documented, possible causes include the assays were insensitive, relevant immune functions were not examined, or imidacloprid is not immunotoxic at this dosing schedule in this species. Neurobehavioral abnormalities were a more sensitive indicator of the sublethal effects of imidacloprid than immunotoxicity.  相似文献   
106.
107.
108.
109.
110.
There is a large and growing population of long-term cancer survivors. Primary care physicians (PCPs) are playing an increasingly greater role in the care of these patients across the continuum of cancer survivorship. In this role, PCPs are faced with the responsibility of managing a range of medical and psychosocial late effects of cancer treatment. In particular, the sexual side effects of treatment which are common and have significant impact on quality of life for the cancer survivor, often go unaddressed. This is an area of clinical care and research that has received increasing attention, highlighted by the presentation of this special issue on Cancer and Sexual Health. The aims of this review are 3-fold. First, we seek to overview common presentations of sexual dysfunction related to major cancer diagnoses in order to give the PCP a sense of the medical issues that the survivor may present with. Barriers to communication about sexual health issues between patient/PCPs in order are also described in order to emphasize the importance of PCPs initiating this important conversation. Next, we provide strategies and resources to help guide the PCP in the management of sexual dysfunction in cancer survivors. Finally, we discuss case examples of survivorship sexual health issues and highlight the role that a PCP can play in each of these case examples.  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