Sequence of the open reading frame of the FL01 gene from Saccharomyces cerevisiae

The cloned part of the flocculation gene FLO1 of Saccharomyces cerevisiae (Teunissen, A.W.R.H., van den Berg, J.A. and Steensma, H.Y. (1993). Physical localization of the flocculation gene FLO1 on chromosome I of Saccharomyces cerevisiae, Yeast, in press) has been sequenced. The sequence contains a large open reading frame of 2685 bp. The amino acid sequence of the putative protein reveals a serine- and threonine-rich C-terminus (46%), the presence of repeated sequences and a possible secretion signal at the N-terminus. Although the sequence is not complete (we assume the missing fragment consists of repeat units), these data strongly suggest that the protein is located in the cell wall, and thus may be directly involved in the flocculation process.     

预氧化化学强化混凝在污水处理中的试验研究

通过采用氧化剂预氧化强化混凝方法处理市政污水的试验研究,证实预氧化化学强化一级处理法可以有效的除去水体中悬浮物、COD、总磷,对水体中NH3-N也有明显的去除作用。经过多种常规药剂筛选,确定采用NaClO和S-8000A进行处理效果最佳,并对其工艺条件进行了试验研究,确定最佳pH值和反应时间。     

水处理絮凝效果综合控制指标研究进展

在分析絮凝相似原则的基础上,综合前人的基础理论和研究成果,对现有絮凝控制指标G、GT、GTRe-1/2、E1t/3T、Eu、Fr等进行了综合对比,阐述了各个指标产生的理论基础及优缺点,并指出现有的絮凝控制指标在一定程度上都存在很大的局限。随着混凝理论的发展和混凝动力学研究的深入,在大量试验的基础上,迫切要求出现更符合实际、更科学的新的参数。     

高锰酸盐复合药剂助凝处理高稳定性地表水

以富含有机物的地表水为研究对象，通过烧杯搅拌试验与生产性对比试验考察了高锰酸盐复合药剂对高稳定性地表水的助凝效果。结果表明，高锰酸盐复合药剂预氧化助凝能显著提高该地表水的混凝效果，明显提高水质或降低混凝剂药耗，比单纯用聚合铝混凝显著降低沉后余浊，在达到相同沉后余浊情况下，比单纯用聚合铝混凝显著降低沉后余浊。在达到相同沉后余浊情况下，比单纯用聚合铝混凝降低药耗３５％￣３８％。     

羧甲基壳聚糖在含油漆废水处理中的应用

研究了用水溶性羧甲基壳聚糖做絮凝剂对含油漆废水 [模拟汽车生产线上产生的含油漆废水配制的 ,w(油漆 ) =0 .3 75% ]的絮凝试验 ,考察了处理效果。研究发现 ,絮凝 80 0 m L这种废水的最小用量为 2 5mg/L,仅为化学絮凝剂用量的 1 /2 0 ,不受 p H限制 ,受温度影响较小 ,絮体形成迅速 ,具有无毒、无污染、使用简便等特点     

污水处理剂的综合评选实验研究

通过对江汉油田含油污水所进行的水处理剂综合评选实验,评选出了聚丙烯酰胺等3种絮凝剂、1种助絮凝剂、4种防垢缓蚀剂和2种杀菌剂以及较佳的净水条件,同时还得出了各种处理剂的加入顺序,经用综合评选出来的配方处理含油污水,其除油率达到100%,除铁率达到97.4%,除机械杂质达到97%,且溶解氧(DO),硫酸盐还原菌(SRB)、腐生菌(TGB)和结垢率均达到了部颁《注入水水质标准》,实验研究还为清污混注提供了有用的数据,证明各药剂配伍性很好。     

YEAST FLOCCULATION: A NEW METHOD FOR CHARACTERISING CELL SURFACE INTERACTIONS

Flocculation is a property of yeast cells that has been traditionally used in industrial fermentations, especially in the brewing and wine industries. It is a cell wall interaction and an increase in flocculation is strongly correlated with an increase in cell surface hydrophobicity . Methods to assay yeast cell surface hydrophobicity are only qualitative and while electrostatic interactions can play an important role, they are not always taken into account . In this work, a simple and accurate method based on contact angle measurements is described to determine yeast cell surface hydrophobicity. With this method, it is possible to quantify yeast cell surface hydrophobicity by determining the free energy of interaction between cells and water molecules. Several yeast strains with different flocculation characteristics have been used to validate the method .     

造纸配料组分的湿部化学

对造纸配料组分及其胶体化学特性、表面动电行为、配料组分的聚集、吸附等作了较为系统的论述。     

煤泥水磁化改性及磁化-絮凝沉降研究

为研究磁化作用对煤泥颗粒同种表面电荷(ζ电位)及表面水化膜的影响,以磁场强度和磁化时间为变量对煤泥水进行磁化处理试验。采用自然沉降、絮凝沉降、混凝沉降和预磁化-絮凝沉降等方法对煤泥水进行沉降处理,分析沉降特性,揭示煤泥水磁化处理作用机理。结果表明,在0.15~0.25 T磁场下预磁化2~3 min时,煤泥颗粒的ζ电位由30.5 me V降至20.1 me V,煤泥颗粒的表面水化膜明显减薄。混凝沉降与预磁化-絮凝沉降的沉降速度、尾泥高度均明显优于单纯的絮凝沉降,而预磁化-絮凝沉降在沉降速度、上清液透光率、尾泥高度等方面又优于混凝沉降,尾泥高度减少25%,煤泥水透光率达到82.2%。