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   1339800篇
  免费   100104篇
  国内免费   4302篇
耳鼻咽喉   16849篇
儿科学   43693篇
妇产科学   36436篇
基础医学   198517篇
口腔科学   36202篇
临床医学   129912篇
内科学   259009篇
皮肤病学   26502篇
神经病学   112234篇
特种医学   48223篇
外国民族医学   366篇
外科学   184402篇
综合类   28785篇
现状与发展   1篇
一般理论   462篇
预防医学   114774篇
眼科学   29022篇
药学   99155篇
  6篇
中国医学   3201篇
肿瘤学   76455篇
  2021年   11201篇
  2019年   11837篇
  2018年   16530篇
  2017年   12442篇
  2016年   13408篇
  2015年   15380篇
  2014年   21061篇
  2013年   32347篇
  2012年   44631篇
  2011年   47282篇
  2010年   27261篇
  2009年   25066篇
  2008年   42944篇
  2007年   45273篇
  2006年   45382篇
  2005年   43746篇
  2004年   41687篇
  2003年   39590篇
  2002年   38392篇
  2001年   60848篇
  2000年   62518篇
  1999年   52281篇
  1998年   14592篇
  1997年   13287篇
  1996年   13123篇
  1995年   12463篇
  1994年   11631篇
  1993年   10926篇
  1992年   41574篇
  1991年   40760篇
  1990年   39444篇
  1989年   37342篇
  1988年   34583篇
  1987年   33695篇
  1986年   32152篇
  1985年   30640篇
  1984年   23037篇
  1983年   19592篇
  1982年   11755篇
  1979年   20804篇
  1978年   14816篇
  1977年   12064篇
  1976年   11877篇
  1975年   12110篇
  1974年   14800篇
  1973年   14473篇
  1972年   13356篇
  1971年   12418篇
  1970年   11485篇
  1969年   10410篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
3.
4.
Background: Lay belief systems about the malleability of human attributes have been shown to impact behavior change in multiple domains. Addiction mindset—i.e., beliefs about the permanence (vs. malleability) of addiction — may affect cigarette smokers’ ability to quit, but this has never been examined. Objectives: The aims of the present research were to develop a measure of addiction mindset (study 1) and examine its associations with various psychological aspects of quitting smoking (study 2). Methods: In Study 1, using factor analysis of current smokers’ and nonsmokers’ (n?=?600) responses to 22 items designed to measure addiction mindset, we developed a reliable six-item Addiction Mindset Scale (AMS). In Study 2, adult smokers (n?=?200) completed the AMS, and measures of a number of psychological processes related to smoking. Results: Higher scores on the AMS, indicative of the belief that addiction is malleable (referred to as a growth mindset), were positively and significantly associated with greater motivation to quit, greater commitment to quitting, greater self-efficacy to abstain, less attribution of failure to lack of ability to change addiction, and fewer self-reported barriers to cessation (all p’s < .05). Conclusions: The results of this study show a relationship between the beliefs about the permanence of addiction and psychological processes relevant to quitting smoking. The findings underscore the potential of future research exploring how addiction mindsets relate to successful smoking cessation as well as other types of addictive behavior and how they can be applied to change people’s behavior.  相似文献   
5.
Pharmaceutical Chemistry Journal - An HPLC-MS method for simultaneous quantitative determination of a novel gestagenic pharmaceutical and two of its metabolites in rat and rabbit blood sera was...  相似文献   
6.
Neorickettsia helminthoeca (NH), the agent of salmon poisoning disease or canine neorickettiosis (CN), is a bacterial endosymbiont of the nematode Nanophyetus salmincola, and infections are spreading among specific fish‐eating mammalians. This article describes the pathologic and immunohistochemical findings associated with spontaneous NH‐induced infections in dogs from Southern Brazil. The principal pathologic findings were hypertrophy of Peyer patches and lymphadenopathy with lymphocytic proliferation, chronic interstitial pneumonia, and chronic enteritis associated with positive intralesional immunoreactivity to antigens of NH within macrophages and histiocytes. Positive immunoreactivity against canine parvovirus‐2 (CPV‐2) or/and canine distemper virus was not detected in the evaluated intestinal segments or in the samples from the cerebellum and lungs, respectively, from the dogs evaluated. These findings demonstrated that NH was involved in the enteric, pulmonary, and lymphoid lesions herein described, and provide additional information to confirm the occurrence of this bacterial endosymbiont within this geographical location. It is proposed that chronic pneumonia should be considered as a pathologic manifestation of NH‐induced infections. Additionally, our results show that the occurrences of CN seem to be underdiagnosed in Southern Brazil due to the confusion with the incidence of CPV‐2.  相似文献   
7.
8.
9.
10.
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