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   2566483篇
  免费   190117篇
  国内免费   7194篇
耳鼻咽喉   34404篇
儿科学   85458篇
妇产科学   72080篇
基础医学   369891篇
口腔科学   70571篇
临床医学   238999篇
内科学   497613篇
皮肤病学   56562篇
神经病学   213564篇
特种医学   97272篇
外国民族医学   811篇
外科学   371005篇
综合类   56819篇
现状与发展   4篇
一般理论   921篇
预防医学   208343篇
眼科学   58002篇
药学   185039篇
  7篇
中国医学   5933篇
肿瘤学   140496篇
  2021年   20046篇
  2019年   21286篇
  2018年   30709篇
  2017年   23414篇
  2016年   26567篇
  2015年   29920篇
  2014年   40945篇
  2013年   62147篇
  2012年   85419篇
  2011年   89869篇
  2010年   52585篇
  2009年   48935篇
  2008年   83080篇
  2007年   88208篇
  2006年   88869篇
  2005年   86544篇
  2004年   82453篇
  2003年   79025篇
  2002年   76455篇
  2001年   117753篇
  2000年   120979篇
  1999年   101153篇
  1998年   29114篇
  1997年   26343篇
  1996年   25939篇
  1995年   24657篇
  1994年   22707篇
  1993年   21310篇
  1992年   77353篇
  1991年   74938篇
  1990年   72656篇
  1989年   69045篇
  1988年   63809篇
  1987年   62205篇
  1986年   58644篇
  1985年   56003篇
  1984年   42550篇
  1983年   36145篇
  1982年   22073篇
  1979年   38567篇
  1978年   27366篇
  1977年   22698篇
  1976年   21731篇
  1975年   22515篇
  1974年   27268篇
  1973年   26583篇
  1972年   24631篇
  1971年   22770篇
  1970年   21380篇
  1969年   19666篇
排序方式: 共有10000条查询结果,搜索用时 8 毫秒
1.
2.
BackgroundThe aim of this study was to estimate the prevalence of dental prosthetic treatment and to investigate the demographic, social, economic and medical factors associated with the use of fixed and removable dentures in a representative sample of adults living in France.MethodsThe data were obtained from the 2002–2003 Decennial Health Survey, a cross-sectional study of a representative sample of the population living in France, which included 29,679 adults. Information was collected by interview. The variables collected were fixed denture, removable denture, age, gender, number of children, area of residence, nationality, educational attainment, family social status, employment status, annual household income per capita, supplementary insurance, chronic disease, eyesight problems/glasses, hearing problems/hearing aids. Multinomial logistic regression models were used to study the relationship between prosthetic treatment and demographic, socioeconomic and medical characteristics unadjusted, adjusted for age and adjusted for all the characteristics.ResultsThe prevalence of prosthetic treatment was 34.6% (95% confidence interval (CI): [34.1; 35.2]) for fixed prosthetic dentures and 13.8% (95% CI: [13.4; 14.2]) for removable prosthetic dentures. We showed a gradient between educational attainment and removable dentures; the odds ratio adjusted for all the variables (aOR) associated with no or primary education compared to post-secondary education was 2.56; 95% CI: [2.09; 3.13]. When annual household income per capita was low, subjects were less likely to report fixed dentures (aOR = 0.68; 95% CI: [0.62; 0.75]) than those with high annual household income per capita. Individuals without insurance less often reported fixed dentures than those with private insurance. Those reporting chronic disease were less likely to report fixed dentures (aOR = 0.87; 95% CI: [0.79; 0.95]) but more likely to report removable dentures (aOR = 1.29; 95% CI: [1.17; 1.43]) than those without chronic disease.ConclusionThis study reveals social, economic and medical inequalities in fixed and removable prosthetic treatment among adults in France.  相似文献   
3.
4.
5.
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   
6.
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   
7.
8.
9.
Metabolism describes the series of chemical reactions that are concerned with the provision of energy to biological systems. They may be divided into reactions involved in energy yield (catabolism: demand exceeds supply), and energy storage (anabolism: supply exceeds demand). Regulation of these pathways is critical for homeostasis, and derangements in metabolism are seen in a wide variety of pathological processes. Understanding metabolism is key to the treatment of many diseases, notably diabetes, as well as underpinning clinical nutritional support.  相似文献   
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