Abstract:All coding sequences in the genome of Escherichia coli were statistically investigated, which turned out that the synonymous codon usage is closely related to the amino acid sequence contexts. The influences of the nearest neighboring amino acids are

Abstract:由三氯氧磷变性木薯淀粉所得的酯化交联淀粉，颗粒完整，形貌和偏光十字形态保持不变，反应主要发生在淀粉颗粒的无定形区内；经红外光谱等检测，发现产物分子中存在P—O—C和P＝O基团，表明淀粉分子中的羟基置换出三氯氧磷分子中的氯原子而发生酯化和交联；极小取代度的变性淀粉，其碘复合物的可见光吸收光谱与原淀粉相似，三氯氧磷最先和支淀粉作用.

Abstract:An improved mathematical model of metabolic flux analysis by material balances and linear programming method was established, which was first applied to batch culture process in this paper. The analysis results indicate that the metabolic efficiency of su

Abstract:By analyzing the effects of biomass on the growth rate of yeast in fermentation, a fuzzy controller, which controlled feed rate in fed batch fermentation of yeast, was established in this paper. The fuzzy rule in the controller can be easily modified by

Abstract:运用遗传算法，利用莫格假丝酵母由木糖生产木糖醇的发酵培养基进行优化，用40个实验样本完成了6种培养基成分、50个浓度水平的优化任务.实验结果表明利用遗传算法可优化培养基成分含量，取得更好的发酵效果.按照优化后的培养基组成，由50g／L木糖获得了29.7g／L木糖醇，理论转化率为65.1%，比优化前提高了3.5%.

Abstract:通过对淀粉丙烯腈接枝共聚物(SPAN)皂化制备吸水剂HSPAN的研究表明HSPAN为水不溶性凝胶，但具有很强的吸水能力.以氢氧化钾皂化,酸作沉淀剂，经洗涤、分散和干燥制备HSPAN的工艺路线较为理想.皂化工艺条件在用碱量为SPAN中接枝链部分摩尔数的1.1倍、皂化温度95°C以上、皂化时间大于3h，且HSPAN的平板干燥温度在70°C时最好.当SPAN接枝百分率在70%左右时，制得的HSPAN吸水率最高.

Abstract:The gene encoding the Pyrococcus furiosus hyperthermophilic DNA polymerases ( pfu ) was cloned and primarily expressed in Escherichia coli by the molecular cloning technology. The gene showed a 2.3 kb fragment in agarose gel electrophoresis. The

Abstract:香菇膳食纤维采用双螺杆挤压机进行挤压处理.通过响应面分析方法对不同操作变量(螺杆转速、套筒温度、喂料水分)对产品色泽(以L、A、B值表示)的影响进行了探讨.总体而言，挤压处理使其L值低于原料组(对照组)，而A值高于原料组，B值介于对照组及挤压组之间，在高螺杆转速、低套筒温度、高喂料水分操作条件下L、A及E值变化最小.

Abstract:从顶青霉(Pencillium corylophilum)P-3-31培养液中分离到3种木聚糖酶组分，分别称为PartA、PartB和PartC.PartB进一步纯化，经SDS-PAGE鉴定为单带，相对分子质量为24200；PartC进一步纯化，经SDS-PAGE鉴定也是单带，相对分子质量为48300.PartA和PartB的最适反应条件为pH4.0,45℃;PartC的最适反应条件为pH5.5,55℃.PartA和PartB对木聚糖以外的底物不能水解；PartC具有水解CMC的交叉活性和β-木糖苷酶活性，但不能将木二糖水解成木糖.3个纯化酶组分和粗酶对不同来源的木聚糖底物均表现出不同的活性.对于粗酶，若桦木木聚糖为底物的相对酶活为100%，则玉米芯木聚糖为底物的相对酶活为143%，蔗渣木聚糖为底物的相对酶活为124%.

Abstract:The relationship between the composition of pectic substance fractions and the texture of pickled potherb mustards during pickling under normal and spoiled conditions was investigated. The results obtained were as follows: (1)Under the normal pickling con

Abstract:The flavonoid of tartary buckwheat showed different antioxidant effects in lard and linoleic acid. The flavonoid of tartary buckwheat with high quercetin content made a good antioxidant result in lard system. The flavonoid of tartary buckwheat with differ

Abstract:利用啤酒废酵母资源，通过破壁预处理与复合酶降解相结合的工艺，制取特定相对分子质量范围的蛋白水解物.响应面分析结果表明，在温度55～60℃,pH6.6～6.8,β-葡聚糖酶用量15～20U/g(以酵母计)的条件下，有最高的肽提取率.酶解7h，蛋白质提取率大于82%，经HPLC测定，水解产物中65%组分的相对分子质量在210～635之间，处于二肽和三肽相对分子质量范围.

Abstract:对产谷氨酰胺转胺酶菌种轮枝链霉菌（Streptoverticillium）SK-1的摇瓶条件进行了研究，结果表明当起始pH值为6.5～8.0，氮源、碳源为蛋白胨与甘油,培养时间为110h时，酶活最高可达1.8μmol/(min

Abstract:生化系统由于其高度的非线性，往往难以得到一个精确的数学模型.虽然许多学者为此做了很多工作，提出了各种模型，但这些模型的精确度和适应性还有待提高.而单纯用神经网络建立的模型由于其各种局限性，精确度也很难得到保证.将神经网络和先验模型结合而构成混合模型可以提高整个模型的精确度和泛化能力.本研究将动态递归神经网络和废水生化处理系统的先验模型结合，说明了结合先验模型的神经网络模型的优越性.

Abstract:The paste property of starch sodium dodecenylsuccinate and corn starch was studied with Haake rotoviscometer and Brabender viscometer. The result showed that the thickening ability of starch sodium dodecenylsuccinate was better than that of corn starch. T

Abstract:The experiment was conducted with sows and their piglets, to study the response of colostrums iron content, Hb value, serum ferrintin(SF) concentration to small peptide chelated iron in neonatal piglets. The results showed that supplement with 80 mg/kg

Abstract:通过对不同溶剂展开体系的选取，确定低聚原花青素分离的薄层色谱展开体系为v(甲苯)∶v(丙酮)∶v(乙酸)=3∶3∶1.从原花青素中分离制备得到儿茶素的单体、二聚体、三聚体，运用高效液相色谱对其进行了分析验证.

Abstract:Soyasaponins were physiologically active components existed in high concentration in soy germs. Two A group soyasaponins were isolated from soy germs with preparative HPLC method. Their structures were confirmed with characteristic reaction, UV and ESI/MS

Abstract:番茄红素油树脂是以番茄皮渣为原料、以非极性溶剂为介质来进行抽提而得到的油溶性成分的混合物，其中除含有番茄红素外，还含有一定数量油脂及脂肪酸，维生素E、甾醇及磷脂等类脂性成分.本研究通过对皂化后所得脂肪酸经AMP衍生化所产生衍生产物的GC／MS法，对其中的脂肪酸组成及其含量进行了分析.结果表明，番茄红素油树脂中脂肪酸组成包括14∶0，16∶0，18∶0，18∶1，18∶2，18∶3等几种，以饱和脂肪酸为主，约占脂肪酸总量的75%，而不饱和脂肪酸仅占25%，并且所有脂肪酸的碳链均较短.

Abstract:采用量压法、分光光度法和KI-淀粉法测定了一系列经不同程度热处理的脂肪氧合酶酶活力.分析了3种方法的优缺点和相关性，结果表明相关性良好，其中，量压法具有最广泛的酶液适用性，分光光度法灵敏度最高，KI-淀粉法更适合于工业化应用.

Abstract:A rapid and high performance method for determination of ethylene glycol monoethyl ether acetate (EEAC) in automotive coatings has been developed. The samples of automotive coatings were extracted with bexane.Ethylene glycol was used as the internal stand

Abstract:论述活塞环径向压力分布函数的一般形式，归纳、总结由径向压力分布求解自由状态型线的方法，对各种计算方法进行了分析比较.实际计算结果表明，各种计算方法之间误差较大，实际应用中采用能量法较宜.

Abstract:针对光纤成缆机生产线上的多只异种电动机的线速度同步控制，提出了模糊控制与PI控制相结合（FUZZY—PI）的方法，实践证明此方法具有动态响应快，超调量小，精度高等特点，能满足生产要求.

Abstract:MATLAB软件是当今控制系统的设计与仿真中重要的工具软件.作者将其用于电力电子学中，对各整流电路进行了仿真，并设计出了一个友好的图形用户界面.该软件仿真方便，结果直观、准确.

Abstract:给出了分子已知情况下比率估计量的偏差和均方误差以及均方误差的估计，并对两类比率估计量进行了比较.

Abstract:Based on the study of CAD software for single weave, this paper solved the CAD software for double wefted weave and double weave of heavy sike fabrics. The CAD software involving such specifications and parameters as warp/weft sizes, warp/weft density, wa

Abstract:In this paper,the influenced factors of test results of the adhesive force of size,which was measured by peel strength method and roving method,as well as the applicant range of these methods,were studied.

Abstract:根据射影几何的透射变换原理，提出一种作建筑形体平行斜透视的作图方法，该方法特点是准确、清晰、便捷.