牡丹花冷藏技术

牡丹冷藏技术是近几年来进行牡丹四季开花研究(牡丹周年开花)而进行的一种牡丹种苗贮藏配套技术;是牡丹四季开花项目进行的基础。四季开花包括牡丹抑制栽培和牡丹促成栽培两种栽培模式。因此,根据栽培模式的不同,其贮藏方式、技术又有所不同。     

贮藏条件对刺葡萄酒主要黄酮类物质的影响

研究了不同的贮藏条件下，刺葡萄酒在贮藏期间主要黄酮类物质的变化. 实验结果表明：随贮藏时间的延长，刺葡萄酒中的主要黄酮类物质逐渐降低，适量的游离SO 2、低温和满罐贮藏可以减缓游离花色苷、原花青素、总类黄酮含量的下降；游离SO 2为40 mg/L、贮藏温度为16 ℃、满罐贮藏12个月的刺葡萄酒，其游离花色苷、原花青素、总类黄酮的保存率分别为99 31%, 76 50%, 92 12%.     

矮牡丹染色体核型分析

该研究目的在于确定矮牡丹的染色体数目与核型。以矮牡丹幼嫩叶片为材料,通过固定、酸解、染色、压片拍照,分析了万花山分布的"延州白"矮牡丹染色体数目、染色体核型,以期为矮牡丹新品种选育及多倍体的育种提供细胞学依据。结果表明,万花山的矮牡丹染色体数目为10条,是二倍体,核型公式为2n=2x=10=8m+2st,染色体相对长度为6.71%～10.01%,核型不对称系数62.43%,属于2A型。     

短期高温对牡丹叶片光合作用及相关生理指标的影响

以3年生盆栽牡丹"洛阳红"为试材,研究了短期高温胁迫下牡丹叶片膨大期叶片的光合作用和几种生理指标的变化.结果表明,短期高温处理后,牡丹叶片净光合速率(Pn)及可溶性蛋白质、叶绿素、游离脯氨酸(Pro)含量分别比对照上升27.53%,74.86%,34.49%,8.79%,而气孔导度(Gs)、胞间CO2质量浓度(Ci)、蒸腾速率(Tr),丙二醛(MDA)含量分别比对照下降28.05%,61.9%,19.57%.短期适度的高温并不会对牡丹的生长造成不良影响.     

碱液去皮工艺对牡丹籽出油率的影响研究

以牡丹籽为研究对象,采用碱液去皮,以牡丹籽出油率为考察指标,通过单因素实验考察了碱液种类、碱液浓度、加热时间、加热温度等因素对出油率的影响,并选取主要影响因素进行正交实验;结果表明:碱液去皮各因素对牡丹籽出油率影响从大到小依次为碱液浓度、加热时间、加热温度,最佳工艺条件为氢氧化钠浓度9%、加热时间5 min、加热温度80℃,此时,牡丹籽出油率达到83.61%。     

杨树花粉低温贮藏技术

设定了-90,-30,-15,5℃和室温5个水平贮藏银中杨花粉,用氯化2,3,5-三苯基四唑(TTC)染色法测定花粉活力.结果表明:银中杨单株间花粉寿命变异显著;花粉活力因贮藏温度不同而存在显著差异,温度越低花粉寿命越长.室温条件下银中杨花粉7 d后即丧失活力;在5℃贮藏10 d时,有活力花粉为22.98%,15 d后丧失活力;15 d后在-15,-30℃条件下贮藏的有活力花粉分别为31.98%,38.56%;在-90℃条件下贮藏15 d后,有活力花粉为82.70%,30 d时有活力的花粉为50.68%.     

三种贮藏温度条件下牡丹花粉的储藏特性

以"凤丹白"等5个牡丹品种的花粉为试材,分别贮藏于室温、14℃和-20℃条件下,定期测定花粉萌发率.结果表明牡丹花粉室温下安全贮藏期(T50)为5.90 d;4 ℃下花粉安全贮藏期为40.48 d;-20℃下花粉安全贮藏期为91.86 d,且品种之间差异显著.     

双维双变贮藏技术研究——金冠苹果呼吸速率的测定

苹果采后,在变温(10～7℃)下贮藏6周,呼吸作用仍银旺盛.用变温,变CO_2条件下(TDCA)贮藏,可以对呼吸与后熟进行抑制,能代替经典的低温贮藏和现代气调(CA)贮藏. 本文以金冠苹果实验比较了0℃冷藏,CA与TDCA贮藏,并以温度为7℃的一般空气下呼吸速率为100％进行比较,三种不同的贮藏方式分别为42％,22％,19％.全冠苹果在空气中高于4～5℃的贮藏条件,呼吸速率就已有明显的高峰期出现,而在0℃冷藏,CA贮藏,TDCA贮藏中均未出现呼吸高峰.其呼吸速率曲线都具有相似平稳下降的趋势,TDCA的呼吸速率与CA相似且低于0℃冷藏.     

永定红柿采后LOX和保护酶与果实贮藏性的关系

以永定红柿(Diospyros Kaki cv.Yongdinghongshi)果实为试材,研究了在0～5℃低温和室温条件下柿果LOX、SOD、POD等酶活性与果实贮藏性的关系.结果表明,适宜低温可显著抑制果实LOX和POD酶活性,保持果实SOD酶较高活性,从而延缓脂质过氧化作用,减少MDA的积累.还研究提出了永定红柿的贮藏保鲜技术.     

琼脂硫酸酯酶酶制剂的制备工艺及其贮藏性能

以重组大肠杆菌(Escherichia.coli)发酵获得的能特异性水解琼脂硫酸酯的重组芳香基硫酸酯酶为研究对象,以酶活力为指标,利用单因素试验对喷雾干燥法制备琼脂硫酸酯酶酶制剂的工艺参数进行优化,并对琼脂硫酸酯酶贮藏过程中各影响因素进行了研究。结果表明,最佳的喷雾干燥工艺条件为:利用麦芽糊精作为助干剂,海藻糖为保护剂,麦芽糊精质量分数25%,进风温度130℃,进料速度400 m L/h,热风流量3.5 m3/min,喷雾压力0.25 MPa。然后对制备得到的琼脂硫酸酯酶酶制剂的贮藏稳定性进行考察,发现温度、空气对琼脂硫酸酯酶固体酶制剂的贮藏稳定性影响较大。分别在4℃和28℃贮藏91 d,4℃贮藏的固体酶制剂的酶活力保留率为71.6%,而在28℃贮藏的固体酶制剂酶活力保留率为63%。真空条件下28℃贮藏91 d,酶活力保留率为65.2%,而敞口条件下为38.3%。光照对琼脂硫酸酯酶酶制剂贮藏也有一定的影响,4℃下避光保存91 d,酶活力保留率为72.3%;而不避光贮藏的酶活力保留率只有48.2%。说明,琼脂硫酸酯酶固体酶制剂适宜在4℃、真空、避光条件下贮藏。     

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.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

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.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

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