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   1378382篇
  免费   104914篇
  国内免费   4358篇
耳鼻咽喉   17196篇
儿科学   45405篇
妇产科学   37664篇
基础医学   203404篇
口腔科学   36386篇
临床医学   136879篇
内科学   265563篇
皮肤病学   27086篇
神经病学   116107篇
特种医学   48985篇
外国民族医学   366篇
外科学   187677篇
综合类   29276篇
现状与发展   1篇
一般理论   553篇
预防医学   120859篇
眼科学   29640篇
药学   101757篇
  6篇
中国医学   3204篇
肿瘤学   79640篇
  2021年   11686篇
  2019年   12476篇
  2018年   17315篇
  2017年   13086篇
  2016年   14101篇
  2015年   16192篇
  2014年   22159篇
  2013年   34271篇
  2012年   47298篇
  2011年   50280篇
  2010年   28996篇
  2009年   26625篇
  2008年   45756篇
  2007年   48294篇
  2006年   48280篇
  2005年   46843篇
  2004年   44658篇
  2003年   42412篇
  2002年   40967篇
  2001年   61247篇
  2000年   62842篇
  1999年   52701篇
  1998年   15149篇
  1997年   13764篇
  1996年   13511篇
  1995年   12868篇
  1994年   12001篇
  1993年   11202篇
  1992年   41786篇
  1991年   40949篇
  1990年   39616篇
  1989年   37515篇
  1988年   34746篇
  1987年   33854篇
  1986年   32316篇
  1985年   30799篇
  1984年   23202篇
  1983年   19742篇
  1982年   11952篇
  1981年   10468篇
  1979年   20903篇
  1978年   14917篇
  1977年   12114篇
  1976年   11933篇
  1975年   12158篇
  1974年   14864篇
  1973年   14509篇
  1972年   13391篇
  1971年   12442篇
  1970年   11506篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
91.
A 17‐year‐old boy presented with recurring severe dermatitis of the face of 5‐months duration that resembled impetigo. He had been treated with several courses of antibiotics without improvement. Biopsy showed changes consistent with allergic contact dermatitis and patch testing later revealed sensitization to benzoyl peroxide, which the patient had been using for the treatment of acne vulgaris.  相似文献   
92.
93.
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   
94.
95.
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   
96.
97.
98.
99.
100.
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