汉语“吃”字系列的古今词义演变

吃东西人人都会,＂吃＂的规矩却不一定人人明白;＂吃＂字人人会写,＂吃＂字的由来却不一定人人知道。其根源和规矩也并不是从一开始就有,而是经历了漫长的时间才形成的。＂吃＂发展到一定程度,已经不只是一种生存行为,而是变成了一种文化。     

虚拟演播室教育电视节目中学习情境设计的原则

通过分析国内外虚拟演播室教育电视节目内容,提炼出创设虚拟演播室教育电视节目学习情境要遵循的原则,即符合学生的认知结构、符合真实性、符合多样性、有吸引力、有利于对问题的意义建构、体现虚拟交互性。     

扩招以来我国普通高校招生结构变化轨迹及特点

扩招以来我国普通高校招生结构发生了一系列变化:招生规模扩张轨迹呈现出明显的阶段性特征,先后经历了急剧扩张期———惯性扩张期———适当抑制扩张期三个阶段,在此过程中,政府的宏观教育政策发挥了主导作用;招生规模扩张的本专科学历层次结构变动非常明显,由最初的以本科生为主转变为以专科生为主,专科生成了扩招的主力军;地方高校占据我国高校规模扩张的绝对主体地位,地方政府发展高等教育具有理性和非理性交织的两重性特点,中央政府应加强高等教育政策的宏观调控;高校招生规模扩张以应用学科为主,基础学科招生以本科生为主,应用学科招生以专科生为主,基础学科招生年度百分比逐年下降,应用学科招生年度百分比逐年上升。     

Erratum to: RegIV expression showing specificity to gastrointestinal tract and its potential role in diagnosing digestive tract neuroendocrine tumor

The original version of this article unfortunately contained a mistake. The presentation of Table 6 was missing. The table is given below:     

HNCO hydrolysis performance in urea-water solution thermohydrolysis process with and without catalysts

The thermolysis of urea-water solution and its product, HNCO hydrolysis is investigated in a dual-reactor system. For the thermal decomposition below about 1073 K, the main products are ammonia (NH3) and isocyanic acid (HNCO) whereas at higher temperatures the oxidation processes take effect and the products include a low concentration of nitric oxide (NO) and nitrous oxide (N2O). The gas HNCO is quite stable and a high yield of HNCO is observed. The ratio of NH3 to HNCO increases from approximately 1.2 to 1.7 with the temperature. The chemical analysis shows that H radical is in favor of HNCO hydrolysis by instigating the reaction HNCO+H·→·NH2+CO and high temperature has positive effect on H radical. The hydrolysis of HNCO over an alumina catalyst made using a sol-gel process (designated as γ-Al2O3) is investigated. The conversion of HNCO is high even at the high space velocities (6×105 h-1) and low temperatures (393–673 K) in the tests with catalysts, which enhances HNCO hydrolysis and raises the ratio of NH3 to HNCO to approximately 100. The pure γ-Al2O3 shows a better catalytic performance than CuO/γ-Al2O3. The addition of CuO not only reduces the surface area but also decreases the Lewis acid sites which are recognized to have a positive effect on the catalytic activity. The apparent activation energy of the hydrolysis reaction amounts to about 25 kJ/mol in 393–473 K while 13 kJ/mol over 473 K. The overall hydrolysis reaction rate on catalysts is mainly determined by external and internal mass-transfer limitations.     

金矿企业的市场环境分析

以国内某黄金公司为例,采用SWOT分析的方法,分析了该公司的优势和劣势,表明了其当前面临的主要挑战和机遇,最后根据SWOT分析的结果,提出了公司长远发展的改进建议。     

浅析VB中用数据库存取图片的方法

在VB中,用数据库存取图像数据是很重要的技术方法,对初学者来说是个难点,本文章就我在日常的学习和利用中总结了控件绑定图片、ADO控件存储图片文件、用其缺省数据库的二进制类型字段来存放图形图像数据三种较为简便的方法以供参考。     

高职院校学生顶岗实习管理工作要点之探析

高职院校推行的学生顶岗实习教育教学活动是深化职业教育改革的重要举措,根据顶岗实习在教育对象、教育过程、教育目标和教育评价等方面所呈现出的特点,探讨了高职院校学生顶岗实习管理工作的要点所在。     

中国精品档案解析之二十三保晋公司档案:尽显山西近代保矿风云(下)

四、公司创设 在争矿过程中,山西爱国士绅充分认识到,山西矿产如不自己开采、挖掘,终将为外人所掠.为了"树自办之基,而示争矿之决心",爱国士绅们积极筹划,准备创建以开采全省煤矿为主的近代民族企业.     

Science Letters：IGFBP7 plays a potential tumor suppressor role against colorectal carcinogenesis with its expression associated with DNA hypomethylation of exon 1

Insulin-like growth factor binding-protein-7 （IGFBP7） was obtained from our previous colonic adenocarcinoma （CRC） and normal mucosa suppression subtraction hybridization （SSH） cDNA libraries. By RT-PCR and immunohistochemistry, we found that IGFBP7 was overexpressed in CRC tissue compared to normal tissue. However, our in vitro experiments performed in 10 CRC cell lines showed that IGFBP7 expressed only in SW480 and Caco2 cell lines, which implied an underlying reversible regulatory mechanism. Using methylation-specific PCR （MSP） and bisulfite sodium PCR （BSP）, we found that its expression was associated with DNA hypomethylation of exonl. This was further supported by the in vitro study which showed restored IGFBP7 expression after demethylation agent 5-aza-2＇-deoxycytidine treatment. Correlation analysis between IGFBP7 expression and prognosis indicated that overexpression of IGFBP7 in CRC tissue correlated with favourable survival. Investigation of the functional role of IGFBP7 through transfection studies showed that IGFBP7 protein could inhibit growth rate, decrease colony formation activity, and induce apoptosis in RKO and SW620 cells, suggesting it a potential tumor suppressor protein in colorectal carcinogenesis. In conclusion, our study clearly demonstrated that IGFBP7 plays a potential tumor suppressor role against colorectal carcinogenesis and its expression is associated with DNA hypomethylation of exon 1.