芽孢乳酸菌产乳酸条件的研究

同型乳酸发酵菌株ＴＱ３３的主要产物为Ｌ－乳酸,论文对其适用的发酵培养基和最佳的发酵条件进行了讨论,认为ＴＱ３３在培养基配方为葡萄糖１０ｇ、酵母膏１．５ｇ;蛋白胨０．５ｇ;ＭｇＳＯ４·７Ｈ２Ｏ：０．０５ｇ;碳酸钙６ｇ（ｐＨ７．２－７．４）时,４０℃下振荡（１５０ｒ／ｍｉｎ．）培养２４ｈ后转入静置发酵阶段,发酵７２ｈ产酸量达到最高为６７．８ｇ／Ｌ,其中Ｌ－乳酸占９６％以上。     

一株产乳酸链球菌肽菌株SM526的分离鉴定及生理特性研究

自包头市售酸乳酪中分离出一株链球菌ＳＭ５２６，菌体多为长链球状，革兰氏染色阳性，抗酸染色阴性，兼性厌氧生长，最适生长温度为３０℃．无芽孢、荚膜及鞭毛，不运动．可从多种糖类产酸，但不产气．接触酶阴性，精氨酸双水解酶阳性，不液化明胶，还原石蕊牛奶并凝固．ＤＮＡ中Ｇ＋Ｃ为３８．５ｍｏｌ％．经鉴定，ＳＭ５２６菌株为乳酸链球菌（Ｓｔｒｅｐｔｏｃｏｃｃｕｓｌａｃｔｉｓ）．经用牛津杯琼脂扩散法检测ＳＭ５２６菌株发酵液，该菌能产生一种小分子活性肽——乳酸链球菌肽，它能抑制或杀死包括芽孢杆菌属、葡萄球菌属和梭菌属等在内的多种革兰氏阳性菌，但对革兰氏阴性菌、霉菌及酵母无效．以金黄色葡萄球菌（Ｓｔａｐｈｙｌｏｃｏｃｃｕｓａｕｒｅｕｓ）和枯草芽孢杆菌（Ｂａｃｉｌｕｓｓｕｂｔｉｌｉｓ）为指示菌株表明，乳酸链球菌肽对细菌的作用方式是杀菌     

一株产乳酸链球菌肽菌株SM526的分离鉴定及生理特性研究

自包头市售酸酪中分离出一株链球菌ＳＭ５２６，菌体多为长链球状，革兰氏染色阳性，抗酸染色阴性，兼性厌氧生长，最适生长温度为３０℃，无芽孢，英膜及鞭毛，不运动，可从多种糖类产酸，但不产气，接触酶阴性，精氨酸双水解酶阳性，不液化明胶，还原石蕊牛奶并凝固，ＤＮＡ中Ｇ＋Ｃ为３８．５ｍｏｌ％，经鉴定，ＳＭ５２６菌株为乳酸链球菌（Ｓｔｒｅｐｔｏｃｏｃｃｕｓｌａｃｔｉｓ）经用牛津杯琼经扩散法检测制或杀死包括芽孢杆     

一株产果胶酶菌株Xg－01的鉴定

从污物中分离出一株兼性厌氧芽孢杆菌，它可产生大量的果胶酶．该菌株生长ｐＨ范围广，生长最高温度为５０℃左右，它适应性强，生长快．在实验室中根据它的菌落形态、个体形态、生理特性和生化反应、生态环境、生活史等作为分类依据，定名为地衣芽孢杆菌（Ｂａｃｉｌｕｓｌｉｃｈｅｎｉｆｏｒｍｉｓ）     

紫外诱变原生质体选育碱性蛋白酶高产菌株的研究──1出发菌株的筛选及产酶条件的研究

从土壤中筛选到一株嗜碱性地衣芽孢杆菌（Ｂａｃｉｌｌｕｓｌｉｃｈｅｎｉｆｏｒｍｉｓ）５３－Ａ６．，该菌株能在ｐＨ１０以上６０℃的环境中良好生长，４５℃ｐＨ９～１２的条件下均可产生活力较高的碱性蛋白酶。酶反应的最适条件：６０℃，ｐＨ１０～１１，在ｐＨ８．５～１１之间较稳定。６０℃保温１ｈ剩余酶活在２０％以上。     

嗜碱芽孢杆菌NTT33β-甘露聚糖酶的特性研究

本文研究了嗜碱芽孢杆菌（ Ｂａｃｉｌｌｕｓ ａｌｋａｌｏｐｈｉｌｉｃ） Ｎ Ｔ Ｔ３３β－ 甘露聚糖酶的产生条件和酶学性质．其产酶的最佳碳源为 １％ 槐豆角,最佳氮源为 １％ 蛋白胨＋ ０．２％ 酵母膏,发酵培养３６ｈ 产酶量最高（达 ６１．３ｕ／ｍ ｌ）．甘油、葡萄糖、甘露醇等对产酶有强的阻遏作用．经分离纯化后测得纯酶的分子量为３８．９ Ｋ Ｄ,等电点 ｐ Ｉ为３．０,酶反应最适 ｐ Ｈ 为 ９．０～１０．０,最适温度为８０℃,稳定 ｐ Ｈ 为６．０～９．０,稳定温度为６０℃以下,金属离子中 Ｃｕ２＋ , Ｂａ２＋ , Ｍ ｇ２＋ , Ａｌ３＋ , Ｃｏ２＋ 对该酶有一定的激活作用,而 Ａｇ＋ , Ｈｇ２＋ , Ｍｎ２＋ 对该酶有明显抑制作用     

α—乙酰乳酸脱羧酶产生菌的筛选

为降低啤酒生产中双乙酰的含量,从不同土壤中分离出１２４株芽孢杆菌,经过用不同发酵培养基和啤酒中双乙酰降低试验,反复筛选,得到一株初产α－乙酰乳酸脱羟酶活性较高的地衣芽孢杆菌Ｈ６（Ｂａｃｉｌｌｕｓ ｌｉｃｈｅｎｉｆｏｒｍｉｓ Ｈ６）。认为该菌株所产酶对啤酒生产有应用价值。     

木聚糖降解菌的筛选和木聚糖酶性质的研究

筛选两株生长快、产木聚糖酶活力高的菌种；黑曲霉（Ａｓｐｅｒｇｉｌｌｕｓｎｉｇｅｒ，ＡＮ０１）、链霉菌（Ｓｔｒｅｐｔｏｍｙｃｅｓｓｐ．Ｓｔｒ７Ｂ），酶活力分别达１２８ｍｇ／Ｌ·ｍｉｎ和１７６ｍｇ／Ｌ·ｍｉｎ；酶反应最适温度分别为６０℃与５０℃；最适ｐＨ值为５．０和６．０，并分别在ｐＨ２．２～５．０，５．８～６．４酶活性稳定；在６０℃条件下保温１．５ｈ，酶活力分别剩余２０．５％，８８．５％，其中ＡＮ０１株原酶液在９０℃保温１０ｍｉｎ，活力仍剩余１４．５％．Ｃｕ２＋对酶活表现出极强抑制，Ｆｅ２＋，Ｍｇ２＋，Ｃａ２＋等离子则有促进作用；用纸层析法探讨了不同培养时间各种产物产生的情况．     

K_(123)菌株普鲁兰酶(Pullulanase)的合成及其酶性质的研究

研究了一株从白酒发酵现场分离得到的Ｋ１２３菌株普鲁兰酶的合成及其部分酶性质．结果是Ｋ１２３菌株的异淀粉酶在培养液中的大量积累发生在稳定期后期,菌的最适生长温度为３５℃,产酶的最适温度则为３０℃;菌的最适生长ｐＨ和产酶的最适ｐＨ均在７．０～７．５;产酶的最佳碳源为可溶性淀粉,有效碳源是糯米淀粉、糊精、支链淀粉、玉米面、茁霉多糖、麦芽糖,而葡萄糖则抑制产酶;产酶的最佳氮源是蛋白胨、酪素水解物,无机氮源则使得Ｋ１２３菌株的产酶量略低于有机氮源．通气量对菌体的生长影响较大,但菌体的生长达稳定期后,通气量的改变对菌的产酶影响不大．Ｋ１２３菌株所产的异淀粉酶水解茁霉多糖的产物为麦芽三糖,不水解动物淀粉,是普鲁兰酶（ｐｕｌｕｌａｎａｓｅ）．该酶反应的最适温度为５０℃,最适ｐＨ５．８,受Ｃａ２＋,Ｍｎ２＋等离子激活,受Ｃｕ２＋,Ｚｎ２＋等离子抑制;该酶的热稳定性较差,５０℃以上迅速失活;ｐＨ稳定性较好,中性,微酸性条件下,冰箱中可长期保存．该酶应用于固态白酒发酵可提高出酒率平均４％以上．     

真菌转化菊糖生产低聚果糖的研究

研究了真菌黑曲霉（Ａｓｐｅｒｇｉｌｌｕｓ ｎｉｇｅｒ）Ａ９７转化菊糖生产果糖的适当条件,结果表明：发酵初始ｐＨ为５．５￣６．０,菊糖浓度为２％,接种量５％,控制前期发酵温度为２８￣３３℃,３６ｈ后发酵温度为３２￣３３℃,发酵周期为４２ｈ左右,最高产酶达２５４．７μ／ｍｌ,在１０Ｌ自控发酵罐中,产酶达到同样水平。产品总还原糖含量６８％,其中果糖９５％,葡萄糖５％。     

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     

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     

Journal of Donghua University ( English Edition) Contents of Volume 31

正~~