Experimental Investigation on Promoting Effect of Composite Promoting Agents on Natural Gas Hydrate Formation

An experiment on effects of composite promoting agents composed of surfactants and liquid hydrocarbons on hydrate formation was conducted and the hydrate formation temperature,pressure,induction time and rate in the presence of different composite promoting agent packages were measured.The surfactants used covered sodium dodecyl sulfate(SDS),sodium dodecyl benzene sulfonate(SDBS) and 2-octyl sodium dodecyl sulfate(GC20S),and the liquid hydrocarbon additives utilized included cyclopentane(CP) and methyl cyclohexane(MCH).It appeared that all these combinations of composite promoting agents could promote hydrate formation.The type II hydrate formation conditions using composite promoting agents composed of CP and GC20S were the mildest and the induction time was the shortest;whereas the type H hydrates formation conditions using composite promoting agents composed of MCH and GC20S were the mildest and the induction time was also the shortest.

Vitamin C Found to Promote Cancer-Causing Agents

我们非常郑重地向读者推荐此文。一直被认为具有抗氧化、保护遗传物质DNA的维生素C具有两面性。美国研究员最新研究表明,维生素C还能帮助生成破坏DNA的物质。根据6月15日出版的美国《科学》周刊报道维生素C是有益健康的营养元素,它具有抗氧化性,能驱除细胞内的有害的自由基。但是美国宾夕法尼亚大学的一研究小组通过试管实验发现,维生素C能够作为催化剂帮助生成一种损伤DNA的genotoxins(基因毒素),这种毒素与DNA作用后引发DNA在人类肿瘤细胞中的突变。这意味着维生素C在保护DNA的同时,也具备伤害它的能力。作为普通读者,本文给我们最有益的启示应该是: …ponted to evidenece of a benefit from an overall healthy diet rather thantaking supplements on any particular nutrient。 此言应了国人的一句俗话:药补(taking supplements on any particularnutrient)不如食补(benefit from an overall healthy diet)。读者以为然否?】