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由于我国水资源的严重缺乏,人们不得不通过多种途径开发新水源,主要有海水淡化、远距离调水、城市污水处理回用。相比之下,污水处理回用投资少、工期短、见效快,比较现实易行,具有重要意义。 相似文献
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Production of Indigo by Immobilization of E. coli BL21 (DE3) Cells in Calcium-Alginate Gel Capsules
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The ability of catalyzing indole into indigo of gene engineering strain expressing P450 BM3 immobilized by entrapment in calcium-alginate gel capsules was examined,and various characteristics of immobilized cells were assessed.Optimum conditions for cells activity were not affected after immobilization,and pH and tempera- ture for both free and immobilized cells were found to be pH 7.5 and 35℃,respectively.The immobilized cells exhibited a markedly improved thermal stability than free cells.After five repeated experiments,the yield of indigo with the immobilized cells retained over 94%of their original activity,which indicated that the operational stability for recycling in batch processes was improved. 相似文献
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澡巾产品是一老产品,它不仅用于服装面料,同时由干其独特的性能而被广泛应用干洗浴,成为日用消费品之一。在今天纺织品不很景气的情况下,它仍能以其旺盛的生命力而立足于市场。但由于其原料以及强捻度的特殊性,给那些设备技术条件较差的小厂加工带来不便,在此,我们把生产中的体会加以简要论述,以供参考。一、原料及性能分析澡巾产品的原料多用133dtex及166dtex的粘胶长丝。这种纤维是有良好的吸湿性,在标准大气条件下回潮率可达12%~13.5%。其强度及伸长受回潮率的影响较大,在湿态条件下强度大大下降,而伸长率则会大为提高。… 相似文献
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