A new bone/blood index in the study of labelled citrate metabolism in rat bones in fracture, deafferentation, rickets, and caries]

A new bone/blood index has been developed which is calculated by dividing % of radionuclide inclusion in the bones by % of the inclusion in the serum. Graphic image of the index changes with time is significantly more demonstrative than digital tables and allows one not only easily measure distribution of the labelled compound between fractions diluted in the blood and sorbed on the bone but also specify a major direction of their transport between blood and bone. The index confirms the presence of biphasic primary fast but weak physical adsorption and secondary slow and strong chemisorption. This was established by the study of time course of the labelled citrate in intact rats of different age as well as in fracture and bone innervation defect, in rickets and dental caries. The proposed index can be applied in investigation of various diseases.     

Attachment of thioglycosides to proteins: enhancement of liver membrane binding

Thioglycosides of D-galactose, D-glucose, N-acetyl-D-glucosamine, and D-mannose were covalently attached to Aspergillus oryzae alpha-amylase, hen's eggs lysozyme, and bovine serum albumin by amidination, diazo coupling, and amide formation. The binding of the newly formed glycoproteins (neoglycoproteins) to rabbit liver membranes was measured, using asialoorosomucoid as a reference. Attachment of D-galactosides by any of the three methods enhanced binding by several orders of magnitude. Coupling of a comparable number of D-mannosides or N-acetyl-D-glucosaminides had little or no effect. Attachment of D-glucosides also enhanced binding but to a variable extent depending on the method of attachment. Thus, the behavior of neoglycoproteins toward rabbit liver membranes closely paralleled that of serum glycoproteins (Ashwell and Morell, 1974) with respect to sugar specificity.     

偏振对种子注入影响的研究

针对2.09 μm单频Ho∶YAG激光器种子注入实验中声光布拉格衍射对不同偏振态的影响进行了理论分析,由于不同偏振态在声光介质中的折射率不同,计算了s偏振光和p偏振光通过声光晶体后的最大偏移距离,同时对两束偏振光经过布拉格衍射进入F-P腔后的输出信号进行了理论分析计算及仿真,并通过实验进行了验证。     

铋掺杂硅酸盐玻璃的制备及性能表征

针对铋掺杂的硅酸盐玻璃进行了研究,用不断提高玻璃系统中碱性氧化物含量的方法研究掺铋硅酸盐玻璃的性能,最终通过各种表征发现碱性氧化物可以提高Bi离子的发光效果,并且这种近红外荧光是由Bi5 引起的.铋掺杂的硅酸盐玻璃具有良好的光学性能,将成为未来超宽带光纤放大器的增益介质.     

铜冶炼烟气制酸酸性废水处理新工艺研究

介绍了处理铜冶炼烟气制酸酸性废水生产白砷和氯化钙的新工艺研究.试验确定了除酸时中和液最佳pH值为4.0,除砷时最佳pH值为9.0,回收砷时钙砷物质的量比最佳值为2.0.该工艺流程简单、处理成本低、产渣量少,可以回收有价金属.工艺过程中产出的白砷和氯化钙分别符合工业白砷三级品和工业氯化钙V型指标.处理后的废水各项指标均符合国家排放标准.     

黑木耳糖蛋白的提取及单糖、氨基酸组成分析

为获得优质的黑木耳糖蛋白,明确其单糖及氨基酸组成,本研究通过单因素实验和响应面法对超声波辅助碱法提取黑木耳糖蛋白的工艺条件进行优化,并采用AKTAgo纯化仪、DEAE GE Healthcare色谱柱对糖蛋白进行分离纯化,采用高效液相色谱(HPLC)法分析其单糖和氨基酸组成。黑木耳糖蛋白的最佳提取工艺条件为:超声时间90 min、料液比1:90 g/L、超声功率200 W、pH8.4、提取温度45℃,此条件下糖蛋白提取的综合评分为55.93分。经分离纯化得到糖蛋白的纯度为74.1%、蛋白回收率为37.5%,该糖蛋白中的单糖组成以葡萄糖(9.95 mg/g)、甘露糖(5.24 mg/g)为主,氨基酸以L-天冬氨酸/L-天冬酰胺(1.16 mg/g)、L-苯丙氨酸(1.14 mg/g)、L-谷氨酸/L-谷氨酰胺(1.10 mg/g)为主。因此,超声波碱法可有效提高黑木耳糖蛋白提取效率,且黑木耳糖蛋白中含有酸性杂多糖、必需氨基酸齐全,为黑木耳糖蛋白的深入研究及应用开发提供了科学参考。     

光谱无损检测技术在农产品产地溯源中的研究进展

实现农产品产地溯源的无损检测,是建立农产品质量安全追溯体系的重要途径,也是保障食品安全质量、维护消费者合法权益的有效手段。相比于传统的检测方法,无损检测技术因其能实现不破坏被检样品的同时获取内外部有效信息的优点而被广泛应用于食品的产地溯源领域。本文主要概述了近红外光谱、高光谱成像、拉曼光谱三种光谱检测技术的原理及其在不同种类可食用农产品产地溯源中的最新应用现状,得出各光谱检测技术在农产品产地鉴别方面具有一定的可行性,同时对未来的研究方向作了展望,以期为农产品产地溯源的无损检测技术体系研究提供理论参考。