吉他霉素发酵工艺的代谢调控研究

研究了吉他霉素发酵工艺的代谢调控,探讨了前体及代谢调节物对抗生素效价的影响.实验结果表明,在发酵开始前期加入0.8％的前体丙酸钠及0.025％的调节物硫酸镁,效价分别比对照组提高了47.2％和30％.     

发酵玉米芯水解液制备乙醇的研究

为了提高戊糖发酵制备乙醇的产率,利用经驯化后的嗜单宁管囊酵母发酵玉米芯水解液,研究了嗜单宁管囊酵母的驯化工艺和发酵条件对乙醇产率的影响,得到了优化的工艺条件。结果表明,经驯化后的嗜单宁管囊酵母发酵玉米芯水解液的糖利用率比原来提高了41.23％,乙醇得率提高了118.83％,戊糖和己糖利用率分别为89.55％和85.23％。优化的发酵条件为初始糖浓度60～90g/L,初始pH5.5～6.0,接种量(体积分数)8％,发酵周期96h。在该发酵条件下,酒精得率可达0.346g/g。     

酸性环境中木聚糖酶高产菌株的筛选及鉴定

从pH 5.0的酸性土壤中筛选出一株木聚糖酶高产菌株A4,菌体固态发酵产酶条件优化表明,最佳发酵培养基配方为：麸皮37.79％,玉米芯9.10％,NH4NO3 0.51％,MnSO4 1.60％,水50％,接种量2.0％,最适发酵温度28～32 ℃,发酵培养48～52 h,木聚糖酶活力最高达到750 U/g（碳源）.该菌株所产木聚糖酶的最适pH为4.8,比野生黑曲霉的pH值低.通过生长形态和分子生物学方法相结合的鉴定该菌株为黄曲霉.     

棉粕对芨芨草叶片在绵羊瘤胃内降解率与发酵的影响

以3只装有永久性瘤胃瘘管的新疆细毛羊羯羊(体重为40±3.02kg)为研究对象,研究不同棉粕添加水平对氨化和未氨化芨芨草叶片中营养成分在绵瘤胃为降解率及对瘤胃发酵的影响。试验结果表明:1)与不添加棉粕组对比,添加不同水平棉粕(100g、200g、300g)均能显著提高(P<0.05)二种芨芨草叶片的DM、OM、NDF、ADF有效降解率。2)添加不同水平棉粕均能显著提高试羊瘤胃内NH3-N平均浓度(P<0.05),但添加棉粕各组差异均不显著(P>0.05)。3)添加不同棉粕水平的各组与不添加组对比,绵羊瘤胃内丙酸和总挥发性脂肪酸的平均浓度均提高,pH值、乙酸和丁酸的浓度均降低,但差异均不显著(P>0.05)。添加不同水平棉粕,均能提高芨芨草叶片中养分瘤胃降解率,但不改变瘤胃发酵模式。     

t. of Physics, Jinan University, 510632, Guanzhou, China;

通过原生质体融合技术,在酿酒酵母与扣囊拟,内孢霉属间原生质体融合产物中,获得兼有两亲株遗传特性的融合子Ｐ５０１和Ｐ５１９．对两融合子进了木薯粉液化物的发酵试验,结果显示乙醇含量分别达６．９％（体积比）和７．７％（体积比）,比亲本提高５３．３％和３７．５％,酒精得率分别提高７．４８％和１０．８９％,提示该技术可用于筛选优良菌株。     

农户自制人工瘤胃饲料的技术及效果

农户自制人工瘤胃饲料系工业化生产人工瘤胃饲料技术的推广与应用,其效果表明:产品质量与工业化生产人工瘤胃饲料基本一致;比未经发酵稻草粉的粗蛋白提高50.0％,真蛋白提高109.4％,粗纤维降解27.1％,消化能也有质的差异,肉猪饲喂效果,日增重比曲酒糟组(对照)高8.2～13.4％。     

发酵花生秧粉对育肥猪生产性能的影响及其促生长机理

研究经复合菌剂发酵后的花生秧粉对育肥猪生产性能的影响及其促生长机理,探讨利用发酵花生秧粉进行育肥猪节粮健康养殖的可行性.以大白×长白×杜洛克三元杂交猪为供试猪,共分为3组,对照组饲喂常规饲粮,实验组Ⅰ饲喂90％常规饲粮+10％发酵花生秧粉,实验组Ⅱ饲喂80％常规饲粮+20％发酵花生秧粉,实验为期40 d,测定并计算各组供试猪的料重比与增重成本,同时采集各组供试猪的新鲜粪样,测定粪样中菌群结构,常规消化酶活力以及常规营养物质含量的变化情况.结果显示:实验组工、Ⅱ与对照组相比,其料重比分别降低11.70％和4.96％,增重成本分别下降9.45％和0.48％,全程成本分别降低4.71％和9.23％;实验组Ⅰ、Ⅱ菌群数量与对照组相比,其大肠杆菌数量分别降低48.75％ (P＜0.01)和40.99％ (P＜0.01),双歧杆菌数量分别提高1.89％ (P＞0.05)和22.78％ (P＜0.05),乳酸菌数量分别提高8.17％ (P＞0.05)和17.13％(P＜0.05),芽孢菌株数量分别提高18.14％ (P＜0.05)和5.42％(P＞0.05);实验组Ⅰ、Ⅱ消化酶活力与对照组相比,纤维素酶活力分别提高15.68％ (P＜0.01)和4.10％ (P＞0.05),蛋白酶活力分别提高2.41％ (P＞0.05)和6.28％ (P＞0.05),淀粉酶活力分别提高17.07％ (P＜0.01)和14.02％ (P＜0.05),脂肪酶活力分别提高2.58％ (P＞0.05)和4.78％(P＞0.05);实验组Ⅰ、Ⅱ试猪粪便中常规营养物质含量与对照组相比,粗蛋白含量都降低9.09％ (P＜0.01),粗纤维含量分别降低5.71％(P＞0.05)和2.86％(P＞0.05),木质素含量都降低4.00％ (P＞0.05),有机酸含量分别降低7.56％(P＜0.01)和9.33％ (P＜0.01),粗脂肪含量分别降低6.67％ (P＞0.05)和14.67％ (P＜0.01),而灰分含量变化不大.研究结果表明:利用发酵花生秧粉饲喂育肥猪可促进动物生长,且大大降低生产成本,为发酵花生秧粉在育肥猪的饲喂养殖中奠定了理论基础.     

酿酒酵母与扣囊拟内孢霉属间原生质体融合的研究

通过原生质体融合技术,在酿酒酵母与扣囊拟,内孢霉属间原生质体融合产物中,获得兼有两亲株遗传特性的融合子Ｐ５０１和Ｐ５１９,对两融合子进了木薯粉液化物的发酵试验,结果显示乙醇含量分别达６．９％（体积比和７．７％（体积比）,比亲本提高５３．３％和３７．５％,酒精得率分别提高７．４８％和１０．８９％,提示该技术可用于筛选优良菌株。     

β成核剂改性PPR/iPP共混物的力学性能与结晶结构的关系

利用差示扫描量热法和X射线衍射法研究了稀土配合物（β成核剂）改性无规共聚聚丙烯(PPR)/等规聚丙烯(iPP)共混物的力学性能和结晶结构的关系.结果表明:添加0.05％的β成核剂能够大幅度地提高PPR、PPR/iPP(质量比分别为70/30、50/50、30/70)共混物、iPP的冲击韧性,缺口冲击强度分别从42.7、...     

半胱胺、四黄素和绿益康对草杂鸡生产性能的影响

目的：研究了半胱胺、四黄素和绿益康三种饲料添加剂对草杂鸡生产性能的影响。方法：试验选取320只1日龄草杂鸡,随机分成4组,每组80只,即试验I、Ⅱ、Ⅲ组和对照组。四黄素、绿益康和半胱胺分别按0.6％添加到试验I、Ⅱ、Ⅲ组的基础日粮中。基础日粮自配。试验期为28天。结果：饲喂半胱胺的试验组第一周平均活重比对照组提高4.27％且差异显著（p〈0.05）;饲喂第二周平均重比对照组、绿益康组和四黄素组的平均活重分别提高了1233％、11.5％和15.66％且差异都显著（p〈0.05）。平均日增重提高了4.29％,料重比降低了22.7％,育成率提高了3.8％。饲喂绿益康的试验组第一周,平均活重比对照组和四黄素组分别提高了5.04％和4.76％且差异都显著（p〈0.05）,三周后平均活重提高了3.96％,平均日增重提高了4.92％,料重比降低了15.7％,育成率提高了75％。饲喂四黄素的试验组平均重提高0.93％,日增重提高了4.92％,料重比下降了20％,育成率提高了7.5％。结论：本试验结果表明绿益康防病促生长效果最好。半胱胺对草杂鸡的促生长效果最好且在饲喂半胱胺的第一、二两周后差异显著（p〈0.05）,四黄素有明显的防病促生长作用。     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the     

An affordable accurate evaluation of the binding conformations predicted by molecular docking studies in bio-system

Franck-Condon factors bridge the gap between theoretical modeling and experimental observations for molecular electronic spectroscopy and electron transfer.Under the displaced harmonic oscillator approximation,multidimensional Franck-Condon factors are decomposed into a product of many one-dimensional(1D)Franck-Condon(FC)factors,and each 1D-FC factor is associated with one Huang-Rhys factor that determines the leading contribution of     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with