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   28953篇
  免费   2432篇
  国内免费   493篇
耳鼻咽喉   481篇
儿科学   1145篇
妇产科学   503篇
基础医学   2490篇
口腔科学   1200篇
临床医学   2886篇
内科学   4626篇
皮肤病学   451篇
神经病学   8208篇
特种医学   383篇
外科学   1339篇
综合类   2005篇
现状与发展   3篇
一般理论   1篇
预防医学   3110篇
眼科学   206篇
药学   2089篇
  7篇
中国医学   437篇
肿瘤学   308篇
  2024年   77篇
  2023年   698篇
  2022年   741篇
  2021年   1512篇
  2020年   1441篇
  2019年   1353篇
  2018年   1331篇
  2017年   1294篇
  2016年   1222篇
  2015年   1105篇
  2014年   1813篇
  2013年   2747篇
  2012年   1430篇
  2011年   1711篇
  2010年   1294篇
  2009年   1356篇
  2008年   1379篇
  2007年   1259篇
  2006年   1093篇
  2005年   876篇
  2004年   773篇
  2003年   785篇
  2002年   626篇
  2001年   449篇
  2000年   401篇
  1999年   348篇
  1998年   348篇
  1997年   298篇
  1996年   221篇
  1995年   220篇
  1994年   193篇
  1993年   168篇
  1992年   182篇
  1991年   129篇
  1990年   139篇
  1989年   79篇
  1988年   98篇
  1987年   87篇
  1986年   73篇
  1985年   103篇
  1984年   77篇
  1983年   56篇
  1982年   51篇
  1981年   45篇
  1980年   36篇
  1979年   37篇
  1978年   35篇
  1977年   30篇
  1976年   17篇
  1974年   11篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
101.
小儿乙状结肠冗长症病理特点分析   总被引:11,自引:0,他引:11  
目的 探讨小儿乙状结肠冗长症的病理特点,以提高对该症病理特点的认识。方法 分析我科1993~2002年间经手术治疗12例小儿乙状结肠冗长症的临床病理资料。结果 小儿乙状结肠冗长症病理特点与先天性巨结肠同源病相似。主要表现为乙状结肠肠壁肥厚,部分肌纤维变性。结肠黏膜萎缩,黏膜下充血水肿;肌间神经丛减少,均可见神经节细胞发育幼稚,且数量减少或体积变小,呈固缩或空泡变性。结论 小儿乙状结肠冗长症大多有肠神经元发育异常。  相似文献   
102.
BACKGROUND: A subgroup of children with obsessive-compulsive and tic disorders are proposed to have an infectious trigger. The purpose of this study was to investigate the relationship between group A streptococcal titers and symptom fluctuations in children with a clinical course resembling that described for pediatric autoimmune neuropsychiatric disorders associated with streptococcus. METHODS: Twenty-five children with obsessive-compulsive disorder and/or tic disorder were evaluated for neuropsychiatric severity and group A streptococcal antibody titers (streptolysin O, deoxyribonuclease B, and carbohydrate A) at 6-week intervals for > or = six consecutive evaluations (total visits=277). RESULTS: Children with large symptom fluctuations (n=15) were compared with children without dramatic fluctuations (n=10). Co-movements of obsessive-compulsive/tic severity and group A streptococcal antibodies were assessed. In subjects with large symptom changes, positive correlations were found between streptococcal titers and obsessive-compulsive severity rating changes (p=.0130). These subjects were also more likely to have elevated group A streptococcal titers during the majority of observations (p=.001). Tic symptom exacerbations occurred more often in the fall/winter months than spring/summer months (p=.03). CONCLUSIONS: Patients with marked obsessive-compulsive/tic symptom changes may be characterized by streptococcal titer elevations and exhibit evidence of seasonal tic exacerbations.  相似文献   
103.
BACKGROUND: Adipokines are involved in the regulation of many inflammatory processes and are present at very high concentrations in cord blood of term infants. OBJECTIVE: We analysed data of a large prospective birth cohort study to examine whether adiponectin and leptin concentration in cord blood are determinants of wheezing disorders in children within the first 2 years of life. METHODS: Seven hundred and forty mothers and their newborns were included in this analysis. Adiponectin and leptin concentrations were measured in cord blood. The cumulative incidence of physician-reported asthma or obstructive bronchitis was recorded during a 2-year follow-up. RESULTS: During the first 2 years of life, asthma or obstructive bronchitis was reported by the caring paediatricians for 157 (19.6%) of the children. We found a strong interaction of cord blood adiponectin and history of atopic disease in the mother with respect to the risk of physician-reported asthma or obstructive bronchitis (P=0.006). Compared with children with cord blood levels in the middle quintile (reference category), the odds ratios for physician-reported asthma or obstructive bronchitis in the bottom quintile and top quintile were 0.14 [95% confidence interval (CI) 0.02-0.90] and 2.12 (95% CI 0.67-6.66), respectively (P for trend=0.0003), among children of mothers with a history of atopy. This association was independent of other established risk factors. Leptin levels in cord blood were not associated with risk of asthma or obstructive bronchitis. CONCLUSIONS: In children of mothers with a history of atopy, concentrations of adiponectin in cord blood could play an important role in determining risk of wheezing disorders in early childhood.  相似文献   
104.
清醒sprague-Dawley雄性大鼠64只,以折断胫腓骨造成应激。观察非内侧基底下丘脑脑区损毁对应激前(Bo)、后(Bs)血浆皮质酮变化的影响。以Bs/Bo及Bs-Bo的值衡量应激反应的大小。根据所损毁脑区的部位及范围将动物分为6组:假手术组、室旁核损毁组、室旁核部分损毁组、室旁核少量损毁组、下丘脑前部—视前区损毁组、下丘脑后部损毁组。用统计学方法比较了6组动物的Bs/Bo及Bs-B0值,以及根据4例室旁核完全损毁动物仍保持有应激反应的事实,我们得出结论:(1)在清醒大鼠的损伤性应激反应中,下丘脑室旁核较其他非基底内侧下丘脑区具有较重要的作用。(2)室旁核以外的促肾上腺皮质激素释放因子神经元可能也参与应激反应。  相似文献   
105.
Background Health-related quality of life (HRQL) is an accepted outcome measure in patients with mood and anxiety disorders. Yet, surprisingly little attention has been paid to the determinants. In this paper we test the hypothesis that it is associated with personality traits while controlling for mental disorders. Methods A large sample of outpatients (n=640) with mood and anxiety disorders was studied. The empirically supported five factor model of normal personality traits was assessed using the NEO-FFI and includes: neuroticism, extraversion, openness to experience, agreeableness, and conscientiousness. Mental disorders were assessed with the CIDI, and HRQL with the SF-36. Results Regression analyses revealed that the NEO-FFI scores, with the exception of conscientiousness, were significantly associated with SF-36 subscales and summary scores, independently from the mental disorders. The percentage of explained variance due to the personality traits was highest for the subscales Vitality (10.0%), Mental Health (13.3%) and the Mental Health Summary Score (9.5%). Furthermore, specific personality traits were related to specific SF-36 subscales. Conclusions A low HRQL of patients with mood or anxiety disorders is not only determined by the disease or the current health but is also shaped by personality traits that are relatively stable throughout an individual's life time.  相似文献   
106.
目的 :探讨慢性丝虫病患者发生心理障碍的相关因素。方法 :用问卷、交谈和观察法对慢性丝虫病 14 0例进行调查分析。结果 :患者中忧郁自卑型 87例 ,占 6 2 % ,消极悲观型 12 0例 ,占 85 % ,焦虑紧张型 35例 ,占 2 5 % ,有对抗情绪 5例 ,占 3 6 %。结论 :在慢性丝虫病患者中心理障碍的产生有不同原因 ,存在个体差异  相似文献   
107.
108.
109.
110.
目的:探讨精神疾病患者劳动能力鉴定状况及与其相关问题。方法:分析1998至2002年共187例精神疾病患者的劳动能力鉴定资料,并进行不同年代、不同诊断、不同级别的组问比较。结果:除1998年外,其余各年度基本资料相似;诊断以精神分裂症为主,精神发育迟滞为次;前者的平均年龄最大、病期最短、累计病休时间最长、残疾级别最低,后者反之。结论:劳动能力鉴定应按有关标准执行,但目前仍存在一些有待进一步完善的问题。  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