钙对花粉萌发的启动效应和对花粉管生长的调节作用

本文以云南松和烟草为材料，研究了钙对花粉萌发和花粉管生长的效应。结果表明花粉萌发介质中高浓度的钙（１０＾－１０＾－２ｍｏｌ／Ｌ）显著抑制了云南松和烟草的花粉萌发和花粉管生长，而较低浓度的钙或缺钙（１０＾－３－０ｍｏｌ／Ｌ）对花粉萌发和花粉管生长无明显影响。测定萌发过程中花粉钙含量变化的结果表明，花粉水合阶段和萌发早期有一急剧的钙释放高峰。在培养介质中加入钙螯合剂ＥＧＴＡ抑制了花煌萌发，但这种抑制可     

钙对花粉萌发的启动产效应和对花粉管生长的调节作用

本文以云南松和烟草为材料，研究了钙对花粉萌发和花粉管生长的效应。结果表明花粉萌发介质中高浓度的钙（１０￣（－１）～１０￣（－１）２ｍｏｌ／Ｌ）显著抑制了云南松和烟草的花粉萌发和花粉管生长，而较低浓度的钙或缺钙（１０￣（－３）～０ｍｏｌ／Ｌ）对花粉萌发和花粉管生长无明显影响。测定萌发过程中花粉钙含量变化的结果表明，花粉水合阶段和萌发早期有一急剧的钙释放高峰。在培养介质中加入钙螫合剂ＥＧＴＡ抑制了花粉的萌发，但这种抑制可被随后加入的钙所逆转。钙通道阻塞剂Ｖｅｒａ－ｐａｍｉｌ和Ｃｏ￣（２＋）也能抑制或阻止花粉萌发，但这种抑制主要发生在花粉萌发的早期。此外，在同样浓度的钙载离子体Ａ＿（２３１８７）的处理下，花粉管生长比花粉萌发过程更为敏感。上述结果暗示着钙可能作为花粉萌发的启动者（Ｉｎｉｔｉａｔｏｒ）和花粉管生长的调节者（Ｒｅｇｕｌａｔｏｒ）来启动花粉萌发和调节花粉管生长。     

中国沙棘花粉生活力检测方法比较研究

比较分析了I-KI染色法、蓝墨水染色法、TTC染色法、过氧化物酶染色法和离体萌发法5种花粉生活力检测方法在测定中国沙棘花粉生活力中的适用性,并探索了花粉适宜的离体萌发条件.结果表明,I-KI染色法、TTC染色法未能将中国沙棘花粉染上色,因此不适合其生活力的检测;蓝墨水染色法和过氧化物酶染色法能够快速地测定中国沙棘花粉生活力,但测定值均偏高,误差相对较大;离体萌发法适合中国沙棘花粉生活力的测定.在筛选中国沙棘花粉适宜的培养基时,发现中国沙棘花粉在蔗糖(0.15～0.20 g·mL-1)+硼酸(0.1×10-4 g·mL-1)的培养基上萌发速度较快,有活力的花粉能够完全萌发且萌发率趋于稳定;附加琼脂的固体培养基对花粉的萌发影响不大.     

20个荷花品种花粉活力测定及贮藏研究

为研究荷花花粉的生活力,选择了20个荷花品种分别用TTC染色法、亚甲基蓝染色法和离体萌发法测定了花粉的染色率和萌发率,并研究了不同温度贮藏条件对花粉生活力的影响.结果表明,亚甲基蓝染色法不能作为荷花花粉生活力的测定方法,离体萌发法结果更直观和准确;20个荷花品种间的离体萌发率差异明显,最高为13.1%,最低为0;不同品种在三种贮藏温度下萌发率变化趋势相同,4℃条件下贮藏较有利于荷花花粉生活力的保持.     

几种不同楸树花粉萌发率的测定及花粉超低温保存方法

对5种不同楸树(楸树、滇楸、梓树、灰楸和黄金树)花粉萌发率的研究表明:花粉在恒温25℃培养6 h时萌发率较好,培养基为:10%蔗糖 0.01%硼酸 1%琼脂。在室温水培条件下,花粉在3 d内都保持较好的萌发率,第4天至第7天萌发率快速下降。花粉在液氮和-70℃条件下贮藏生活力较好,随贮藏时间延长生活力下降幅度也较小;常温贮藏时花粉萌发率最低,且生活力丧失快;而0℃和-20℃贮藏花粉生活力居中。超低温保存后花粉的解冻方式对花粉的萌发率影响较大,楸树各树种均以温水浴(35~38℃)下解冻5 min效果最好。     

香石竹花粉生活力的研究

采用离体萌发法和TTC染色法对香石竹多头类型品种粉恋、迷恋、皇族,单头品种兰贵人的花粉生活力进行了测定,同时对花粉生活力测定方法进行了比较研究．结果表明：在0．15％硼酸＋10％蔗糖＋1％琼脂培养基上,花粉萌发率最高;4个品种中,迷恋的花粉萌发率最高,粉恋和皇族其次,兰贵人最低;TTC染色法测定的花粉生活力比萌发法高．     

不同培养和贮藏条件对‘凤丹白’牡丹花粉萌发的影响

为了确定不同质量浓度的蔗糖和硼酸组合溶液对‘凤丹白’(Paeonia ostii‘Fengdanbai’)牡丹花粉萌发的影响,探讨在适宜的培养质量浓度条件下不同的培养时间与萌发率之间的关系、不同温度条件贮藏后干花粉萌发率的变化情况,以新鲜的‘凤丹白’牡丹花粉为材料,用花粉离体萌发法进行活力测定并采用液体培养花粉的方法。结果表明:0.06 g·L~(-1)硼酸+100 g·L~(-1)蔗糖培养的‘凤丹白’花粉萌发率为63.22%,最适的离体培养时间为8 h,在5种不同温度条件下贮藏后生活力变化显著,超低温(-80℃)状态下花粉生活力基本保持不变,可以长期贮藏;4℃,低温(-18℃)状态下花粉生活力下降较慢,可以短期贮藏;而在30℃和25℃状态下花粉生活力下降较快,不适合贮藏。湿花粉生活力在30℃条件下比在25℃条件下下降的更快,在温度条件相同时湿花粉生活力均低于干花粉生活力。     

多个月季品种与蔷薇的花粉生活力研究

以30个月季品种及蔷薇属植物为试验材料,采用沙尔达考夫染色法、悬滴液发芽法测定其花粉生活力,并根据花粉萌发率对品种进行分级.结果表明:1)悬滴液发芽法更适合花粉生活力的测定,10%蔗糖浓度下适宜月季品种及蔷薇属植物的花粉萌发;2)30个月季品种和蔷薇中,花粉萌发率较高的是‘十姊妹’、‘橘红火焰’、‘小果蔷薇’和‘粉荷’,分别为84.20%、71.60%、59.20%和54.00%,花粉生活力随着时间的延长而降低;3)以花粉萌发率为判断标准,月季品种及蔷薇分为三个等级,一级品种:‘十姊妹’、‘橘红火焰’,萌发率高于50%;二级品种:‘粉和平’、‘摩尼卡’,萌发率在10%~50%;三级品种:‘光谱’、‘金阵雨’,萌发率低于10%.     

尿素和硼及生长调节剂对荔枝花粉萌发与生长的影响

25度条件下,在荔枝花粉萌发培养基上添加0．1％－0．4％的尿素,0．1－1．5％的硼酸及0．1－1．0mg.L^-1的萘乙酸均不同程度地促进花粉萌发与花粉管生,5－50mg.L^-1乙烯对花粉的萌发与花粉管生长则有抑制作用,抑制程度与其浓度呈正相关,在1－5mg.L^-1的BA下,花粉萌发率下降,但花粉管生长受促,25mg.L^-1BA可显著抑制花粉的萌花与生长,三个荔枝品种花粉萌发对温度较敏感,18度时不萌发。     

红桤木花粉生活力及其贮藏方法的研究

以红桤木花粉为试材,用TTC染色法和离体培养法对其生活力进行了测定,同时探讨了不同贮藏方法对花粉生活力的影响。结果表明：TTC法不适于红桤木花粉生活力的测定;花粉在10 %蔗糖+0.1 %硼酸的培养基上培养8 h后萌发率最高;随着贮藏时间的延长红桤木花粉生活力下降,其适宜贮藏温度为-20 ℃;超低温保存中花粉以自来水冲洗解冻效果最好,但超低温保存并没有延长花粉保存时间。     

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.     

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     

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

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