Abstract:将黑曲霉AS0023生产的果糖转移酶作用于底物蔗糖,可制备含量为55%的低聚果糖,但该产品中亦含有30%的副产物葡萄糖.利用酵母消化低聚果糖产品中的葡萄糖,可生产高纯度低聚果糖.将筛选得到具有较弱转化酶活性的酵母SK2.003,经培养后添加于总糖浓度为20%的低聚果糖中,经30℃、250r/min反应24h,制得纯度为80.24%的低聚果糖.

Abstract:Some properties of the red bean starch were studied, including granule microphotograph, hilum,X ray differaction pattern, molecular weight distribution and Brabender amylograms. Comparisions were made with corn and potato starche

Abstract:验证了超临界二氧化碳作为从油脂脱臭馏出物中分离生育酚的可行性.采用一套气液相交替循环的测定装置对油酸甲酯-二氧化碳、生育酚-二氧化碳体系进行了相平衡数据的测定,并据此进行了油酸甲酯、生育酚在超临界二氧化碳中溶解度、分配系数的分析,为超临界二氧化碳萃馏装置的设计积累了必要的基础数据.

Abstract:运用正交试验理论,对L-乳酸高产突变株NAF-032的优化摇瓶发酵条件作了初步研究,确定了优化的发酵培养基和发酵条件.优化发酵培养基为(g/L)葡萄糖140,氯化铵1,KH2PO40.3,MgSO4*7H2O0.25,ZnSO4*7H2O0.08;优化培养条件为34℃,摇床转速200r/min,装液量50mL(250mL容积三角瓶),一次性添加CaCO380g/L调节pH值.米根霉NAF-032的摇瓶发酵L-乳酸积累量可达94.28g/L.

Abstract:采用正交试验方案筛选得到以乳链菌肽(Nisin)为主的复合防腐剂,可以延缓低温火腿肠中的微生物引起的腐败,保质期达到3个月.在研究Nisin复合防腐剂延长低温火腿肠保质期的同时,分析了添加Nisin等食品添加剂对低温火腿肠色泽和质构的影响.结果表明低温火腿肠的色泽在辅料A0.25～0.50g/kg,辅料B20～25g/kg,辅料C1.5g/kg,辅料D0.15～0.25g/kg时较理想;低温火腿肠的硬度只与辅料A和辅料B二因素有关,当辅料A0.10g/kg,辅料B20g/kg时硬度较大.低温火腿肠的弹性在辅料A0.10g/kg,辅料B1.5g/kg,辅料C0.15g/kg时较好

Abstract:The rheological properties of tomato purees were determined at four temperatures, and four concentrations. It showed that the systems exhibited pseudoplastic behavior with large magnitudes of Casson yield stresses(40 140Pa). Two models, K=K 0 exp (E

Abstract:The effect of citrate salts in different concentrations on the system of allocated milk alcohol drink was studied in this paper. The pH value and viscosity of the milk alcohol drink system increased with the increase of the citrate concentration. In add

Abstract:The effect of six kinds of preservatives on controlling the bacteria's further growth in Aloe gel juice was studied .The effect order from good to bad is as follows: propyl p hydroxybenzoate, ethyl p hydroxybenzoate, methy p hydrobenzoate, sodium be

Abstract:用酶法催化氧化胆固醇制备胆甾-4-烯-3-酮相对于化学法合成具有反应简单、成本较低等优点.作者探讨了在正辛烷作为有机相的两相反应体系中,以胆固醇氧化酶催化氧化胆固醇制备胆甾-4-烯-3-酮的方法.在胆固醇质量浓度为40g/L,反应时间40min、反应温度40℃、磷酸缓冲液-正辛烷体积比32、通氧40L/h及搅拌转速300r/min下,胆固醇转化率达到92%,经薄板层析及紫外扫描,发现转化产物为单一的胆甾-4-烯-3-酮.

Abstract:通过质粒转化实验,获得了较好的产hEGF重组菌,对重组菌发酵条件进行优化,获得最佳初始糖质量浓度为5g/L、蛋白胨20g/L、酵母抽提物10g/L、(NH4)2HPO43.5g/L、Amp100mg/L;最佳接种时间为种子液生长到5～6h,即菌体OD值在1.0～2.0;诱导剂最佳添加时间为8h,即菌体OD值在8.0左右.通过流加发酵进行高密度培养,可使重组菌的hEGF的产率达102mg/L,比优化前提高了近30%.

Abstract:对一株宇佐美曲霉进行紫外光、微波和60Co的逐级诱变育种,使酸性蛋白酶产量从2800U/mL提高到7200U/mL.突变株传代多次,产酶性能保持稳定;对突变株与出发株的发酵过程进行了比较研究,发现突变株最大产酶时间提前10h以上,而培养基pH值对产酶有一定影响.

Abstract:Extraction of the volatile components in cooked chicken meat was conducted by Simultaneous Distillation Extractor(SDE).GC MS was used to identify the volatile components in cooked chicken meat, and 44 compounds were identified,in which the number of car

Abstract:以高密度聚乙烯(HDPE)与乙烯-醋酸乙烯共聚物(EVA)为基体材料,表面改性氢氧化镁为填料,红磷为阻燃剂,通过熔融共混的方法,得到了低烟无卤阻燃电缆料.研究了EVA/HDPE的不同配比、氢氧化镁及红磷的不同用量对材料力学性能和阻燃性能的影响.结果表明,当EVA/HDPE为3∶1,表面处理氢氧化镁用量为70份(以树脂100份计),阻燃助剂红磷8份,加工助剂6份时,所得到电缆料的物理机械性能和阻燃性能良好,可满足实际生产的需要.

Abstract:Fixe dcatalyst TiO 2/SiO 2(TSO) was prepared by TiCl 4 and isopropyl alcohol. Photocatalytically degrade dye soultion, preparing conditions and photocatalytic conditions were studied. TSO remains the construction of silica gel with the advantages of bi

Abstract:采用HPLC法研究了番茄油树脂中番茄红素的测定方法.结果表明最佳的色谱分离条件为流动相采用V(乙腈)V(甲醇)V(二氯甲烷)＝7∶7∶2的体系、检测波长472nm,在此条件下可以很好地分离番茄红素、β-胡萝卜素及其异构体,番茄红素和β-胡萝卜素的保留时间分别为9～10min和13～14min.保留时间和样品的重复性试验表明,变异系数均低于5%,回收率范围在98%～101%之间.

Abstract:Ideal ultrafiltration curve was compared with real one for determining Critical Micelle Concentration of surfactants. Applicability of ultrafiltration membrane and effect of solution volume on determination of CMC were examined. The applicability and acc

Abstract:A method of parametric designing on the basis of 3D CAD system was adopted, and the connection between 3D models template and parametric programming with the design variables was put forward. Effective programming and general purpose have increased. A ge

Abstract:In this paper, a stable optimal model with a neural network for boiler combustion was developed. The object function of the model is minimizing the energy cost. A penalty function algorithm for the model was given, at the same time a case for the model ap

Abstract:A new method to solve the proplem of the data which characterized with layer was found in the paper,and the method which was developed from the traditional way combines XML technology with DBMS technology was also obtained. This paper also introduced the

Abstract:In this paper,a Web based database accessing model with hierarchy structure was introduced and a method of fuzzy optimization query was given.

Abstract:In this paper, a method for improving the searching efficiency of A * algorithm was proposed. Through introducing look ahead function into A * algorithm, the evaluating function can be improved and therefore A * algorithm may become more efficient. Th

Abstract:For the ratio estimate in two-stage sampling, the bias and mean square errors(MES) of the estimater value have been obtained, and the estimater value of the MSE has been given.

Abstract:对黄色短杆菌L-异亮氨酸高产菌XQ-4(AHVrAECrSucgSGrEthrα-ABrIleHxr)分批发酵供氧需求进行了研究.在2L台式发酵罐中进行分批发酵,当体积传氧系数(Kla)为385h-1左右时,供氧比较适宜,在138g/L的葡萄糖溶液中可产生23.5g/LL-异亮氨酸.

Abstract:利用磷钼酸蓝离心分光光度法,对磷酸酯表面活性剂中的微量无机磷进行直接测定,该方法在大量有机磷酸酯存在时对无机磷的测定无干扰,样品无需预处理,回收率为95%～103%.可监测反应釜中的磷化剂含量,适用于对生产过程的实时监控.

Abstract:The bottom disk of the rotator of a high shear homogenizer was considered as an inner edge clampped circular plate subjected to some axisymetric moments,and its bending deformation was studied in this paper using an analytic method. The formulas obtained

Abstract:随着反义核酸的发现及对其研究的深入,反义技术已被应用于生物基因调控的研究,并逐步应用于抗病毒及肿瘤、爱滋病等基因水平治疗等新兴药物的开发.概述了反义核酸概念及作用机理,人工反义的设计、合成以及应用前景.

Abstract:Chitosan is modified by enzymatic hydrolysis into chitooligosacchrides with some interesting functional properties and physiological activities, which have attracted many researchers in chitin science in recent years. Several hydrolases to chitosan and me