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INTRODUCTION Helicobacter pylori (H.pylori) was grouped as a class I carcinogen by the International Agency for Research on Cancer in 1994. A direct relation be-tween H.pylori infection and gastric carcinogenesis was demonstrated in 1998 in an experimental animal model (Watanabe et al., 1998). However, the role of H.pylori in human gastric carcinogenesis is sup-ported almost exclusively by epidemiological data and prospective histopathological studies. So far the mechanism of H.pylor… 相似文献
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任务型教学是一种与英语新课程标准理念相匹配的,有助于落实新课程标准的教学途径.尽管该理论从其提出至今不过短短的二十几年时间,由于它对语言学习所起的重要作用,它已被我们认同和接受.本文认为,设计一个合适的任务是运用该理论的关键.初中英语任务型教学中的任务设计必须把握好以下"六性",即目的性、真实性、阶梯性、实用性、拓展性和激励性. 相似文献
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<全日制义务教育物理课程标准>要求"了解科学技术社会(STS),逐步树立科学的世界观",说明还要求在教学实践中教师应将STS教育理念进行全面地渗透,我国对STS教育非常重视.渗透STS教育理念有利于学生把科学与技术、科学技术与社会相联系.作为初中物理教师,在实际的教学中,我们应从教学的各个环节着手,精心设计教学方案,将STS教育理念最大程度地体现出来,从而从物理教学的各个方面提升学生的科学素质. 相似文献
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近年来,内外资企业所得税的法律制度改革已成为社会的共识,尤其是在WTO框架范围内,政府本着“公平税负,鼓励竞争”的原则,将着力改革过去实行的内外资企业区别对待的企业所得税法律制度,现阶段的重点应从合理确定税前扣除等优惠政策入手,逐步实现“两法”的合并。 相似文献
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论述了赤峰中色库博红烨锌业公司在电解法炼锌过程中对电解液含铅的控制方法,从而有效控制了电解锌锌锭含铅量. 相似文献
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中师物理第三册181页,谈到“光的全反射现象,在自然界中经常可以看到。露水或喷泉的水珠,在阳光照耀下,显得格外明亮,就是光在水珠内发生全反射的缘故”。此问题很有探讨的必要。 1.各种形状的水珠都能“格外明亮”吗? 2.一定要在太阳光“直接照射”下,水珠才“格外明亮”吗? 3.能否用光路图进行具体探讨呢? 首先,用球形玻璃和椭球旋转体玻璃进引观察。发现球形玻璃就不显得格外明亮,只有椭球旋转体玻璃才显得“格外明亮”。 相似文献
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朱永良 《宁波教育学院学报》2003,5(Z1):34-35
新课程要求教师提高素质、更新观念、转变角色,呼唤充分体现尊重、民主和发展精神的新型师生关系,改革传统的学生观。教师应树立教育民主思想,尊重学生人格;要做学生的管理者、领路人和学生的知心朋友。 相似文献
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Objective: to explore a new serological method for detecting Helicobac ter pylori ( H. pylori ) infection. Methods: Serum soluble antigen of H. p ylor i was detected by using avidin-biotin ELISA technique to evaluate the status of H. pylori infection and for comparison with rapid urease test ( RUT ), histo logi c examination and serology. Results: The sensitivity, specificity, positive pred ictive value and negative predictive value were 77.46%, 91.07%, 91.67% a nd 76.12 %, respectively. The prevalence rate of serum H. pylori soluble antigen in 138 patients undergoing endoscopy was similar to the rate obtained by 14 C-UBT met hods ( P>0.05 ). Conclusions: The detection of serum H. pylori solub le antigen( HpSAg) could be used as a new serological method which is accurate, and convenie nt, not affected by the memorizing reaction of serum antibody; is more sensitive , m ore specific and suitable for clinical diagnosis, and evaluation of eradication and for follow-up of H. pylori as well as for detection in children and pre gnant women. 相似文献
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Objective: To evaluate the interaction between serum levels of soluble intercellular adhesion molecule-1 (sICAM-1) and Helicobacter pylori (H. pylori) infection in patients with chronic gastritis and peptic ulcer. Methods: The serum levels of sICAM-1 in 205 patients with chronic gastric diseases were detected by ELISA method and the status of H. pylori was determined by histologic examination, RUT, 14C - UBT, and serology. The sera obtained from 18 healthy volunteers served as controls. Results: The serum levels of sICAM-1 were significantly higher in patients with H. pylori positive than those of H. pylori negative (889.43±32.52 ng/ml vs. 747.07±30.45 ng/ml, P<0.05). The serum levels of sICAM-1 in patients with mild, moderate and severe infection of H. pylori were 841.68±72.36 ng/ml, 905.43±37.59 ng/ml and 1012.54±49.34 ng/ml,respectively (P<0.05). The serum levels of sICAM-1 proved to be significantly correlated with the density of H. pylori colonization in gastric mucosa (rs =0.316, P<0.001). The serum levels of sICAM-1 in patients with chronic gastritis and peptic ulcer were significantly higher than those in healthy controls (P<0.05). Conclusions: These results indicated that H. pylori infection up-regulates the expression of sICAM-1. 相似文献
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《全日制义务教育物理课程标准》要求“了解科学技术社会（STS）,逐步树立科学的世界观”,说明还要求在教学实践中教师应将STS教育理念进行全面地渗透,我国对STS教育非常重视。渗透STS教育理念有利于学生把科学与技术、科学技术与社会相联系：作为初中物理教师,在实际的教学中,我们应从教学的各个环节着手,精心设计教学方案,将STS教育理念最大程度地体现卅来．从而从物理教学的各个方面提升学生的科学索质。 相似文献