冷藏温度对真空包装杏鲍菇品质的影响

探讨不同的冷藏温度对杏鲍菇真空贮藏品质变化的影响.实验结果表明:2℃贮藏可以降低杏鲍菇呼吸强度、推迟呼吸高峰的出现,抑制总酚含量的快速升高,而保持较高的可溶性蛋白质含量,降低杏鲍菇褐变速度,可达到贮藏保鲜的效果;杏鲍菇在2℃下真空包装贮藏20d,仍具有一定的商品价值,其呼吸高峰不明显,其白度(L^*)值为78.21,黄度(YI)值为20.65,总酚含量为21.52mg/g,可溶性蛋白质含量为6.35mg/g.     

芦笋采后生理与贮藏保鲜研究

对芦笋嫩茎采后细胞透性、呼吸强度、还原糖含量及可溶性固形物含量变化、纤维化、木质化等进行测定.结果表明,芦笋嫩茎采收后,以0.5 cm大孔PE薄膜袋包装,在2～4℃温度下贮藏保鲜效果最好.采后15～20 d时间内商品率可达90%左右;在-1～1℃之间贮藏时间超过10 d会出现冻害.初步认为,2℃可能是芦笋嫩茎贮藏的最适温度.     

可食性壳聚糖复合涂膜包装对鲜切莲藕保鲜效果的影响

采用不同质量浓度壳聚糖（0.5％、1.0％、2.0％）分别添加0.5％淀粉、1.0％氯化钙（CaC12）和1.0％抗坏血酸（AsA）作为涂膜剂,在（4±0.5）℃保存条件下对鲜切莲藕进行涂膜处理,测定鲜切莲藕贮藏过程中失重率和腐烂率、总糖含量、维生素C、褐变强度（BD）、多酚氧化酶（PPO）活性等的变化.结果表明：壳聚糖涂膜处理可有效降低鲜切莲藕的水分、维生素C等成分的损失,延缓鲜切莲藕褐变的发生,从而延长鲜切莲藕的货架期,且2.0％壳聚耱涂膜处理对鲜切莲藕具有良好的保鲜效果.     

枇杷果实贮藏生理的研究

于两个枇杷采收季节对不同贮藏温度下枇杷果实中过氧化物酶活性和呼吸强度的变化进行了研究,同时测定了贮藏中果实的总糖、还原糖、有机酸和维生素C的含量.研究表明,低温(5+0.5)℃显著延缓了果实种子中过氧化物酶活性的变化,推迟了果实呼吸高峰的出现时间,有利于各营养成分的保存.枇杷果实采收后,采用适宜的低温贮藏结合PE薄膜袋包装是一种较为理想的保鲜手段.     

贮藏温度和包装方式对油

研究了不同贮藏温度和包装方式处理组合条件下油果实呼吸强度、品质成分和脂质过氧化作用与耐贮性的关系.结果表明,以(3±1)℃+0.04mm厚度PE薄膜袋包装+100mg/kg保鲜剂Ⅱ号+乙烯吸收剂处理组合贮藏效果最好,能有效抑制果实呼吸强度和品质成分的变化,提高SOD活性和抑制POD活性上升及MDA含量增加,贮藏77 d时,好果率达100%,失重率仅为0.87%,且未发现果肉褐变.呼吸跃变前POD活性上升可作为果实衰老的一个标志,油果肉褐变与果实衰老有关.     

保鲜剂对玫瑰切花瓶插寿命的影响

实验以玫瑰切花为材料,研究了切花保鲜剂的最佳配方,并且对切花保鲜过程中的含水量、过氧化物酶活性、多酚氧化酶活性以及可溶性糖含量4个生理指标的变化进行了探讨.结果表明,玫瑰切花保鲜剂的最佳配方为蔗糖60 g/L、无水乙醇10 mL/L、抗坏血酸50 mg/L、8-羟基喹啉200 mg/L和硝酸钾52 mg/L.保鲜天数是对照值的2.2倍,经保鲜处理的切花能维持较高的含糖量,切花的过氧化物酶和多酚氧化酶的活性得到一定的抑制.     

壳聚糖与柠檬酸复配涂膜液对草莓保鲜效果的研究

将草莓分别进行壳聚糖1%-柠檬酸2 %、壳聚糖1%-柠檬酸3 %、壳聚糖1%-柠檬酸4 %、空白对照4种方式涂膜处理,于4 ℃下贮藏5 d,对其采后生理指标(颜色、硬度、腐烂率、可溶性固形物、呼吸强度、过氧化物酶和多酚氧化酶活性等)进行测定。结果表明:壳聚糖涂膜能减缓草莓贮藏过程中的褐变程度,延缓草莓果肉的软化,降低草莓的腐烂率;壳聚糖处理的草莓样品组的呼吸强度分别由32.65,33.59,32.31 mL·(kg·h)^-1升至69.98,62.42,64.63 mL·(kg·h)^-1,而对照组的呼吸强度升至83.98 mL·(kg·h)^-1,其中壳聚糖1%-柠檬酸4 %涂膜液的保鲜效果最好。     

甘肃武威薄皮核桃茎尖组织培养中防褐变措施的研究

以多年生武威薄皮核桃茎尖为试材,研究了培养基成分、不同种类和质量浓度的褐变抑制剂、生长调节剂以及转瓶周期对其褐变的影响.结果表明:培养基成分、褐变抑制剂、生长调节剂和转瓶周期对外植体褐变的影响均不同;为抑制褐变及保证茎尖正常分化生长,先将茎尖接种于1/2 MS+ 2g/L活性炭的培养基中,置于5℃冰箱中暗培养7d后取出,再转接于DKW+6-BA(1.0 mg/L) +IAA (0.01 mg/L) +5 mL20％硫代硫酸钠的培养基中,置于25℃室内光照环境下培养,每隔3～5d转换1次培养基,能有效抑制褐变.     

柠檬酸抑制珍珠矮根状茎分化及其褐变机制研究

珍珠矮根状茎在添加不同质量浓度柠檬酸(0、0.1、0.2、0.5、1.0、2.0、5.0 g/L)的分化培养基(MS+NAA 0.5mg/L+蔗糖30.0 g/L+TDZ 0.1 mg/L)中培养50 d后,统计根状茎的平均出芽数,检测与褐变相关的酶活性和总酚含量.结果表明:柠檬酸质量浓度在0.1～1.0 g/L的范围内,随着培养基中柠檬酸含量的提高,根状茎的出芽数逐步升高;PPO、POD、PAL活性及总酚含量逐步降低,SOD和CAT活性逐步提高,当柠檬酸质量浓度为1.0 g/L,平均出芽数为4.48,培养基未明显褐变;柠檬酸质量浓度在1.0～5.0 g/L的范围内,随着柠檬酸质量浓度的提高,出芽数逐步下降,PPO、POD、PAL活性及总酚含量逐步升高,SOD、CAT活性逐步下降.     

白花刺蔷薇种子和果实的形态与组分

对白花刺蔷薇的种子和果实形态与化学成分含量进行了研究测定。结果表明：①白花刺蔷薇果实红色,长1.5～2.5 cm,径0.8～1.0 cm,内含种子1～12粒不等,种子外包白色薄膜;种子近似卵形,种皮土黄色或褐色。种子尺寸为4.58 mm×2.21 mm,单粒质量12.82 mg。②白花刺蔷薇种子总糖质量分数为124.2mg/g,高于粗脂肪（71.0 mg/g）、灰分（16.5 mg/g）、可溶性糖（11.7 mg/g）、蛋白质（1.7 mg/g）、游离氨基酸（0.2 mg/g）等其他内含物含量。③白花刺蔷薇果实中总糖质量分数为44.6 mg/g,明显高于酒石酸（4.5 mg/g）、苹果酸（4.0 mg/g）、单宁（3.3 mg/g）、赖氨酸（4.1 mg/g）、色氨酸（1.8 mg/g）、游离氨基酸（0.4 mg/g）、蛋白质（1.2 mg/g）等内含物的含量;Vc的质量分数为2.723 mg/g,远远高于苹果、梨等同科水果;SOD含量1 482.33 U/g,是刺梨的3倍;同时还含有Ca,Mg,Mn等多种矿质元素,开发利用前景广阔。     

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