丙酸钙对牦牛肉保鲜效果的研究

将牦牛内在不同浓度的丙酸钙溶液中浸泡，真空包装后在0～4℃条件下冷藏，通过测定1、7、14、21、28d的挥发性盐基氮和pH来观测其保鲜效果，结果表明丙酸钙对牦牛肉有明显的保鲜效果，浓度以3％最佳。     

酸枣叶中Vc的浸提及稳定性研究

用酒精、柠檬酸、水浸提酸枣叶片中的Ｖｃ，对浸提率和浸提液中Ｖｃ的稳定性进行了研究。结果表明：在相同浸提温度、时间条件下，浸提率大小为酒精溶液＞酸溶液＞水溶液；升高水温可使浸提率大大提高，在５０℃水温条件下，浸提８ｈ，可使浸提率达到９９．３８％。浸提液中Ｖｃ的稳定性受热及空气的影响较大，加热和与空气接触都可以加速Ｖｃ的损失。降低浸提液的ｐＨ值和加一定量的糖可对Ｖｃ起保存效果。     

关于香辛料保鲜猪肉技术的研究

叙述了几种常见香辛料及其主要保鲜机能成分，并以不同组合与不同浓度提取液配制成一系列天然保鲜剂。运用感官鉴定、ｐＨ值比色法、硫化氢实验、微生物检测法和蛋白质沉淀法，在不同温度条件下，对香辛料保鲜猪肉技术进行研究。结果表明：在６℃条件下，经香辛料保鲜剂处理过的生猪肉保鲜期可达１３ｄ，而不经处理的对照样只能保鲜２ｄ，两者差异显著。研究发现香辛料中丁香、肉桂、豆蔻、小茴香保鲜作用较好     

钴的模拟腐蚀产物在柠檬酸、过氧化氢水溶液中的溶解特性

研究了压水堆主回路钴的模拟腐蚀产物在柠檬酸、过氧化氢和柠檬酸—过氧化氢的水溶液中的溶解特性，结果表明：钴模拟腐蚀产物在柠檬酸水溶液中的溶解量随柠檬酸浓度的增加而明显增大，在不同pH值时，按溶解量q排列的次序是：q3．00＞q4．50＞q4．00＞q3．50＞q2．33，在同一浓度的柠檬酸水溶液中，钴模拟腐蚀产物的溶解量比铁的相应值高0倍以上；钴模拟腐蚀产物的溶解量70℃时比60℃、80℃时都高；钴模拟腐蚀产物在H2O2水溶液中的溶解量比在柠檬酸中的相应值低得多，在过氧化氢－柠檬酸水溶液中的溶解量比单一柠檬酸水溶液的相应值高．图4，参7     

植酸盐乳液对荔枝保鲜效果的探讨

本文研究植酸及其钠、钾盐对荔枝果实的保鲜效果试验。结果表明，用量为０．２％植酸钠或钾盐、０．１％多菌灵的溶液经０．５％的油酸钠或海藻酸钠乳化后浸泡当天采摘的荔枝果实１５至３０秒，室温晾干，用聚乙烯薄膜袋包封。在日均气温２９℃至３３℃，相对湿度６４％至８８％之间变化的第七天内，荔枝果色保鲜率平均为９５．３６％，空白试验则为７５．８％。随后的５天日均气温为２６．８℃至３１．４℃，相对湿度７２％至７９％，则荔枝果色保鲜率平均达到７７．３％，空白试验则为０。经此试验的荔枝果实，好果果壳仍呈鲜红色，果肉完整，鲜甜味不变。     

螺旋藻放氢的研究

螺旋藻含有可逆性氢酶，在合适的条件下能催化放氢。研究表明：当培养基的ｐＨ值为８．５￣９．５，气相氧浓度为１％的条件时，能使螺旋藻放氢达到最大效率。外加葡萄糖、蔗糖有利于放氢，葡萄糖，蔗糖的最适浓度为０．１ｍｏｌ／Ｌ，而α－酮戊二酸，柠檬酸等对螺旋藻的放氢没有促进作用。     

荔枝保鲜过程中多酚氧化酶活性的抑制研究

荔枝保鲜过程中极易产生酶促褐变．本文采用分光光度法，研究了荔枝果皮的多酚氧化酶(PPO)的活性．考察了抗坏血酸、柠檬酸、亚硫酸钠、硫代硫酸钠、双氧水等的褐变抑制效果，确定出以柠檬酸为抑制剂后，通过抑制剂浓度、pH值、温度等因素对多酚氧化酶活性的影响，得出各个影响因素的两个水平值．最后通过正交试验法确定出荔枝保鲜过程中多酚氧化酶抑制的最佳条件．     

压水堆主回路摸拟腐蚀产物在柠檬酸、过氧化氢水溶液中的溶解特性研究 Ⅱ 钴的模拟腐蚀产物

研究了压水堆主回路钴的模拟腐蚀产物在柠檬酸水溶液、过氧化氢水溶液、柠檬酸—过氧化氢水溶液中的溶解特性，结果表明：钴模拟腐蚀产物在柠檬酸水溶液中的溶解量随柠檬酸浓度的增加而明显增大并且比铁的相应值高10倍以上，在pH2．33－pH4．50范围内，pH3．00时的溶解量囊大，在60、70、80℃温度下，70℃时的溶解量最高；钴模拟腐蚀产物在H2O2水溶液中的溶解量比柠檬酸中的相应值低；钴模拟腐蚀产物在过氧化氢—柠檬酸水溶液中的溶解量比单一柠檬酸水溶液的相应值高．     

家用洗洁精对蚕豆根尖的毒性效应

本文研究了８种家用洗洁精对蚕豆根尖的毒性效应，结果表明，在０．１％的浓度下，６种洗洁精溶液使得蚕豆根尖细胞的微核率显著上升，在１％和１０％的浓度下，８种洗洁精溶液均使得蚕豆根尖发黑，生长变形．     

固定化黑曲霉Ax-6分生孢子生产柠檬酸的研究

用海藻酸钙包埋黑曲霉Ａｘ－６分生孢子制成固定化孢子,在发酵培养基中进行表面培养和间歇式培养生产柠檬酸,固定化孢子在１４％蔗糖为单一碳源的培养基中,ｐＨ为３．８,温度为３５℃下表面培养１３ｄ,柠檬酸产量为６５．５３ｇ．Ｌ＾－１,在相同条件下,间歇式培养３１ｄ,柠檬酸的产量保持在５２．１５－８１．０２ｇ．ｌ＾－１,第２批柠檬酸产量高达８１．０２ｇ．Ｌ＾－１,而游离孢子仅保持发酵１７ｄ。第２批柠檬酸最高     

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

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