饲用酶制剂、益生菌的热稳定性与真空喷涂技术进展

综述了饲用酶制剂包括植酸酶、纤维素酶、β-葡聚糖酶、木聚糖酶、蛋白酶和益生菌包括乳酸菌类、芽孢杆菌类和真菌及酵母类的热稳定性研究进展,以及提高这些产品的热稳定性的措施,总结了饲用酶制剂和益生菌真空喷涂于颗粒饲料的技术研究进展,指出了该类研究的存在问题和研究方向。     

Synthesis and photoluminescence properties of novel red-emitting Ca14Mg2(SiO4)8:Eu3+/Sm3+ phosphors

Novel red-emitting Eu3+, Sm3+ singly doped and co-doped Ca14Mg2(SiO4)8 phosphors were prepared by conventional solid- state reaction. Powder X-ray diffraction patterns were employed to confirm phase pu...     

Thermoluminescence characteristics of NaSr4（BO3）3：Ce^3＋ under β-ray irradiation

The thermoluminescence (TL) properties of Ce3+ doped NaSr4(BO3)3 phosphor under the β-ray irradiation were reported. The polycrystalline sample was synthesized by high temperature solid-state reaction. The TL glow curve of NaSr4(BO3)3:Ce3+ phosphor was com-posed of only one peak. TL kinetic parameters of NaSr4(BO3)3:Ce3+ were deduced by the peak shape method, the activation energy (E) was 0.590 eV and the frequency factor was 1.008×106s-1. TL dose response was linear in the range of measurement. The 3-dimensional (3D) TL emission spectrum was also recorded, the emission spectrum consisted of two bands located at 441 and 479 nm respectively, corresponding to the characteristic 4f05d1→2F(5/2,7/2) transitions of the Ce3+ ion. The fading behavior of the NaSr4(BO3)3:Ce3+ phosphor over a period of 15 d was also studied.     

微生物絮凝剂的研究现状及其应用

本文综述了微生物絮凝剂的研究发展、微生物絮凝剂产生菌、絮凝机制其在水处理中的应用, 并预示了今后微生物絮凝剂领域的研究将出现的重点。     

Long-lasting phosphorescence study on Y_3Al_5O_（12） doped with different concentrations of Ce~（3＋）

Long-lasting phosphorescence (LLP) was observed in Ce-doped Y3Al5O12 phosphors synthesized in reducing atmosphere. The characteristic emission of the 2D-2F5/2 and 2D-2F7/2 transition of Ce3+ in photoluminescence (PL) and LLP spectra was studied. It was interesting that the ratio between the peak areas of 2D-2F5/2 and 2D-2F 7/2 transitions in the PL spectrum was different from the ratio of that in LLP emission spectrum. And the ratios had different change regularities with increased Ce3+ concentration. The p...     

SDS/CTAB混合水溶液体系的相行为及流变性

以SDS和CTAB为例研究了正负离子表面活性剂混合体系的流变性质,探讨了流变性与相行为的关系。研究发现,混合体系相图中对称的存在两个双水相区,在这两个相区附近体系具有高黏度性质,盐的加入可使体系的两个黏度峰值大幅度增加。并阐述了小分子盐对体系微观结构和黏度的影响机理。冷冻蚀刻电镜照片证明,混合体系的高黏度性质与形成液晶结构有关。