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   37480篇
  免费   2466篇
  国内免费   1252篇
耳鼻咽喉   299篇
儿科学   1127篇
妇产科学   2523篇
基础医学   5528篇
口腔科学   751篇
临床医学   4338篇
内科学   3640篇
皮肤病学   478篇
神经病学   2794篇
特种医学   700篇
外国民族医学   1篇
外科学   4755篇
综合类   6199篇
现状与发展   2篇
一般理论   5篇
预防医学   2795篇
眼科学   713篇
药学   2481篇
  17篇
中国医学   1179篇
肿瘤学   873篇
  2024年   48篇
  2023年   378篇
  2022年   631篇
  2021年   964篇
  2020年   958篇
  2019年   969篇
  2018年   936篇
  2017年   1043篇
  2016年   1087篇
  2015年   1029篇
  2014年   1953篇
  2013年   2619篇
  2012年   1773篇
  2011年   2060篇
  2010年   1770篇
  2009年   1788篇
  2008年   1826篇
  2007年   1880篇
  2006年   1861篇
  2005年   1713篇
  2004年   1540篇
  2003年   1339篇
  2002年   1117篇
  2001年   953篇
  2000年   808篇
  1999年   791篇
  1998年   655篇
  1997年   562篇
  1996年   536篇
  1995年   589篇
  1994年   473篇
  1993年   380篇
  1992年   378篇
  1991年   404篇
  1990年   346篇
  1989年   297篇
  1988年   276篇
  1987年   244篇
  1986年   237篇
  1985年   341篇
  1984年   306篇
  1983年   193篇
  1982年   246篇
  1981年   220篇
  1980年   191篇
  1979年   133篇
  1978年   122篇
  1977年   74篇
  1976年   63篇
  1975年   29篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
Understandings of violence, and especially sexual violence against children, must be situated within the local context. The 2009 Violence against Children Survey in Zanzibar indicated that 6% of girls and 9% of boys reported having experienced sexual violence before the age of 18 years. This paper reports on an in-depth qualitative study conducted in Zanzibar to provide further insights to these findings by examining the circumstances for sexual and other violence against children in Zanzibar. Twenty-four in-depth interviews with young people and 18 focus-group discussions with young people and adults were conducted in rural and urban Zanzibar. A further 8 interviews were conducted with parents and key stakeholders in government and NGO offices that provide services for children. The findings revealed that religious and cultural practices, which form the foundation of Swahili culture in Zanzibar, provide a moral frame for childhood development, but structural factors make children vulnerable to sexual violence. Both boys and girls are vulnerable to sexual violence in the home, neighbourhood, at school and, in particular, at madrasa or Qur’anic schools. As religion and culture are strong influences on childhood, preventing sexual violence at madrasa schools would strengthen the positive aspects of religious teachings for ensuring a safe childhood.  相似文献   
992.
Diagnosis of gonorrhoea is an ongoing challenge. The organism is fastidious requiring meticulous collection and transport for successful cultivation. Asymptomatic infections are common which go undetected by conventional methods thereby leading to continued transmission and the risk of complications. The nucleic acid amplification tests, now increasingly used in developed countries, offer improved sensitivity compared to bacterial culture. However, these continue to suffer sequence related problems leading to false positive and false negative results. Further, these cannot be used for generation of data on antibiotic susceptibility because genetic markers of antibiotic resistance to recommended therapies have not been fully characterised. They are unaffordable in a setting like ours where reliance is placed on syndromic approach for sexually transmitted infection (STI) management. The use of syndromic approach has resulted in a considerable decline in the number of Neisseria gonorrhoeae isolates that have been cultured for diagnostic purposes. Many laboratories formerly doing so are no longer performing culture for gonococci, and the basic skills have been lost. There is a need to not only revive this skill but also adopt newer technologies that can aid in accurate diagnosis in a cost-effective manner. There is room for innovation that can facilitate the development of a point-of-care test for this bacterial STI.  相似文献   
993.
994.
Critical illness polyneuropathy and myopathy:a systematic review   总被引:1,自引:0,他引:1  
Critical illness polyneuropathy and critical illness myopathy are frequent complications of severe illness that involve sensorimotor axons and skeletal muscles, respectively. Clinically, they manifest as limb and respiratory muscle weakness. Critical illness polyneuropathy/myopathy in isolation or combination increases intensive care unit morbidity via the inability or difficulty in weaning these patients off mechanical ventilation. Many patients continue to suffer from decreased exercise capacity and compromised quality of life for months to years after the acute event. Substantial progress has been made lately in the understanding of the pathophysiology of critical illness polyneuropathy and myopathy. Clinical and ancillary test results should be carefully interpreted to differentiate critical illness polyneuropathy/myopathy from similar weaknesses in this patient population. The present review is aimed at providing the latest knowledge concerning the pathophysiology of critical illness polyneuropathy/myopathy along with relevant clinical, diagnostic, differentiating, and treatment information for this debilitat- ing neurological disease.  相似文献   
995.
996.
997.
IntroductionPerinatal asphyxia (PA) is a major cause of neonatal mortality and morbidity. Research has shown that in rats fetal asphyxia (FA) can provoke neuroprotection against a subsequent more severe perinatal asphyctic insult. This is called fetal asphyctic preconditioning (PC). Our objective was to investigate alterations in the placental inflammatory phenotype associated with PC.MethodsFA was induced in the rat at embryonic day 17 by reversibly clamping the uterine circulation and PA was induced at birth by submersion of the uterine horns in a saline bath for 19 min. The effect of PC was studied by inducing FA at E17, followed by PA at E21. Placental TNF-α, IL-1β, IL-6 and IL-10 mRNA and protein levels were measured by qPCR and ELISA.ResultsIL-1β mRNA increased in the labouring FA group, but IL-1β protein decreased after both FA and PA. In the PC group, IL-1β mRNA and protein levels were similar to controls. IL-6 protein increased 6 h after FA, however decreased 24 h after FA. IL-6 mRNA was higher in the labouring PA group. IL-10 protein decreased 24 h after FA. At birth, IL-10 mRNA increased in the PA group; however, IL-10 protein decreased in both the PA and the FA group. In the PC group, IL-10 mRNA and protein were similar to control levels.DiscussionDepleted protein concentrations of IL-10 and IL-1β after one single asphyctic insult were reversed after fetal asphyctic PC. In addition, PC placentas showed less up-regulation of IL-6 mRNA compared to the PA ones. This modulated placental inflammatory phenotype might contribute to the improved neonatal outcome showed after fetal asphyctic PC.  相似文献   
998.
To determine whether the change in the number of pulmonary ultrasound B-line can accurately assess the extravascular lung water (EVLW) before and after continuous bedside blood purification (CBP) in patients with multiple organ dysfunction syndrome (MODS).Seventy-six patients with MODS who underwent CBP were examined within 24 hours before and after CBP using pulmonary ultrasound to detect the number of ultrasound B-line or using pulse indicator continuous cardiac output method to examine extravascular lung water, blood oxygenation index, and B-type natriuretic peptide (BNP) content. The correlation of the change in the number of B lines before and after CBP treatment with the negative balance of 24 hours liquid, the change of oxygenation index, and BNP content were analyzed.In the 76 patients, CBP treatment significantly decreased EVLW, the number of B-line, and BNP (P < .05 for all), while it significantly increased the oxygenation index (P < .05). Correlation analysis showed that the decrease in B-line number after CBP treatment was positively correlated with the 24 hours negative lung fluid balance, decrease of EVLW, oxygenation index improvement, and decreased BNP content. The change in the numbers of pulmonary ultrasound B-line can accurately assess the change of EVLW before and after CBP treatment and reflect the efficiency of ventilation in the lungs and the risk of heart failure.Thus, it can replace pulse indicator continuous cardiac output as an indicator for evaluating EVLW in patients with MODS treated with CBP.  相似文献   
999.
1000.
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