黑曲霉HD-404酸性蛋白酶若干动力学性质的研究

研究金属离子、EDTA、表面活性剂、碘乙醚等对黑曲霉HD-404酸性蛋白酶活力的影响的结果表明:Cu~(2+)、Mn~(2+)对酶有明显的激活作用;Cu~(2+)、Mn~(2+)和Al~(3+)同时使用时,产生协同效应,显著提高酶活力;十二烷基磺酸钠(SDS)、西湖高效洗洁剂对酶有明显的抑制作用;在以酪蛋白为底物时,AgNO_3是酶的不可逆抑制剂。     

北海市酸雨污染及成因的研究

对北海市1988～1990年的酸雨污染及成因进行初步的研究,结果表明:北海市已受到了一定程度的酸雨污染,其污染程度较我国部分城市和广西的主要城市为轻。降水的酸度与监测区域、时间,污染物,气象条件有较密切的关系。     

钆离子对钐、铕、铽、镝——草酸体系的荧光增敏效应

发现在草酸体系荧光法测定S_m~(3+)、Eu~(3+)、Tb~(3+)、Dy~(3+)含量时,由于Gd~(3+)的存在能使这些离子的特征荧光显著增敏,从而开发了Gd~(3+)一草酸增敏体系同时测定钐、铕、铽、镝的荧光新体系。用本法成功地同时测定了氟碳铈铜矿和氧化钆中的铕、铽含量。     

饲粮能量、粗朊和氨基酸水平对林麝麝香产量的影响

成年雄性林麝24头随机均分为3组,分别用高、中、低三种能量、粗朊和氨基酸水平的饲料饲养,观测其对饲料中能量、粗朊和氨基酸利用率,麝香产量和饲料总成本的影响。结果表明,中水平组的各项数据均显著低于高水平组(p<0.05),低水平组则极显著低于高水平组(p<0.01)。     

雪鸡肉几种氨基酸和微量元素的测定及对比分析

通过对雪鸡氨基酸和微量元素测定。结果表明：雪鸡肉中氨基酸含量丰富，总合百分含量高达２２．２１。８种必须氨基酸，除包氨酸外，其余含量都比较高。人工养殖的雪鸡肉同野生雪鸡肉相比较，１７种氨基酸总合百分含量高。雪鸡肉中氨基酸的总含量与家鸡、鹌鹑及乌骨鸡相比较，雪鸡仍占优势，但微量元素的含量略少。     

Effects of acid deposition on crops and forests

Summary Acid deposition includes the gases, sulphur dioxide and nitrogen oxides, and their derivative acids which are dissolved in various forms of precipitation. The effects of both dry and wet deposition on crops and forests are reviewed, including interactions between these two categories of pollutant. Particular emphasis is given to the current forest decline in central Europe, including the possible role of ozone.     

Photoelectrochemical synergetic degradation of Acid Orange II with TiO_2 modified β-PbO_2 electrode

Advanced oxidation processes (AOPs) have been paid increasing attention recently due to their effective degradation of organic pollutants into environmentally friendly chemicals even resulting in complete mineralization, among which TiO2 heterogeneous photocatalysis appears to be the most emerging destructive technology. Surfactants, pesticides, dyes and a wide range of organic pollutants can be effectively reduced when TiO2 particles are used in photocatalytic degradation process. However, …     

Photoelectrochemical synergetic degradation of Acid Orange II with TiO2 modified β-PbO2 electrode

Electrochemically assisted photocatalysis is an effective approach to improve photocatalytic efficiency. In this paper, modified β-PbO2 electrode was prepared by TiO2 co-deposition and characterized by SEM and XRD. Then 2.0g TiO2 modified β-PbO2 electrode (2.0 g TiO2 involved in the 200 mL co-deposition solution) was used in electrochemically assisted photocatalytic degradation of Acid Orange II and the influence of initial pH values was investigated when the potential applied across the electrodes was 1.5 V. When the potential applied was 2.5 V, the difference of the degradation process and the final products were studied. The results indicated that 2.0 g TiO2 modified β-PbO2 electrode was different from the unmodified one in that the β-PbO2 crystals became finer and the electrode became more compact and more uniform. The synergetic effect in electrochemically assisted photocatalytic degradation of Acid Orange Ⅱ was observed and degradation efficiency and TOC removal were the highest at initial solution pH 2.0. By UV-visible spectral analysis, it was proved that photoelectrochemical synergetic degradation of Acid Orange Ⅱ went through the step of producing main product maleic acid for the solution at the initial pH 2.0 within 2 h, but the degradation was slow for the solution at the initial pH 12.0.     

超声波降解酸性大红GR染料废水的研究

染料废水COD高、色度高、成分复杂,是一种典型的难降解废水。本文研究了用超声波降解低浓度酸性大红GR染料废水。结果表明,经频率为20kHz、功率为120w的超声波作用后,废水的COD升高,色度降低。用紫外光谱对降解后结构的表征说明其结构明显被破坏,苯环和萘环部分被打开为可被重铬酸钾氧化的小分子物质,使其COD升高、可生化性提高。同时,超声波还能起到加快反应速率的作用。     

酸性铬深蓝共振光散射光谱法测定蛋白质的研究

基于人血清白蛋白 (HSA)对酸性铬深蓝共振光散射的增强效应 ,拟定了一种新的测定HSA的共振光散射法 .在pH =3.78的B R缓冲溶液中 ,酸性铬深蓝与蛋白质结合 ,产生强烈的共振光散射 ,在λ =36 5nm处 ,共振光散射强度较大 ,且共振光散射强度与蛋白质的浓度成线性关系 ,线性范围为 0 .0～ 12 .0 μg mL ,检测限可达 0 .13μg mL .该法简便、快速 ,用于人体血清样品蛋白质的测定 ,结果令人满意 .