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.     

高校图书馆与读者之间的法律关系研究

高校图书馆部分规章制度缺乏法律依据和高校图书馆与读者之间的法律关系不明确,是高校图书馆与读者冲突日益增多的主要原因。高校图书馆与读者之间的法律关系是基于合同形成的民事法律关系。民事法律关系的定位有助于图书馆维护自身利益和保护读者合法权益,有助于依法治馆的实现。     

数字图书馆版权问题解决模式分析

版权问题是数字图书馆建设中面临的关键性问题,文章对现有的几种解决数字图书馆版权问题的模式进行了介绍,并简单分析了这几种解决模式各自的局限性.     

食品工艺学教学改革探索

结合食品质量与安全专业发展特点的教学模式,通过对教学整体内容的调整、拓展、优化,探索教学改革新思路,以适应新世纪人才成长的要求.