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   1368368篇
  免费   105743篇
  国内免费   4344篇
耳鼻咽喉   17147篇
儿科学   44538篇
妇产科学   37183篇
基础医学   202975篇
口腔科学   36726篇
临床医学   133973篇
内科学   264183篇
皮肤病学   26788篇
神经病学   115290篇
特种医学   49535篇
外国民族医学   422篇
外科学   188571篇
综合类   29593篇
现状与发展   1篇
一般理论   501篇
预防医学   118447篇
眼科学   29888篇
药学   101479篇
  6篇
中国医学   3182篇
肿瘤学   78027篇
  2021年   11392篇
  2019年   12133篇
  2018年   16878篇
  2017年   12720篇
  2016年   13729篇
  2015年   15687篇
  2014年   21546篇
  2013年   33264篇
  2012年   45792篇
  2011年   48490篇
  2010年   28043篇
  2009年   25786篇
  2008年   44226篇
  2007年   46566篇
  2006年   46686篇
  2005年   45103篇
  2004年   43089篇
  2003年   40872篇
  2002年   39639篇
  2001年   61823篇
  2000年   63624篇
  1999年   53211篇
  1998年   15043篇
  1997年   13659篇
  1996年   13466篇
  1995年   12817篇
  1994年   11958篇
  1993年   11219篇
  1992年   42323篇
  1991年   41535篇
  1990年   40156篇
  1989年   38069篇
  1988年   35322篇
  1987年   34353篇
  1986年   32783篇
  1985年   31248篇
  1984年   23546篇
  1983年   20017篇
  1982年   12054篇
  1979年   21327篇
  1978年   15202篇
  1977年   12406篇
  1976年   12202篇
  1975年   12412篇
  1974年   15141篇
  1973年   14813篇
  1972年   13659篇
  1971年   12683篇
  1970年   11731篇
  1969年   10646篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
91.
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   
92.
93.
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   
94.
95.
96.
97.
98.
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   
99.
100.
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