64 resultados para PSI


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在光系统I(PSI)内部结合有大量的水分子,而这些水分子的生理功能还不清楚。在本工作中,我们通过外加具有渗透活性和吸水强的多羟基化合物甘油和蔗糖来改变PSI环境中水的含量,研究水的改变对PSI结构与功能的影响。主要结果如下: 1.甘油和蔗糖对PSI的电子传递产生影响,影响程度和大小与它们的浓度有关。一般地,低浓度的甘油和蔗糖可促进PSI的电子传递,而在高浓度时,这种促进作用有所减弱。但过高浓度的甘油(>60%, v/v)会抑制PSI的电子传递活性。 2.与对PSI电子传递的影响趋势相类似,在低浓度的甘油和蔗糖存在下,PSI的光化学反应活性(PSI反应中心色素P700的光氧化还原能力)大为增加,而较高浓度的甘油和蔗糖对P700的氧化还原能力有所抑制。 3.甘油和蔗糖也会改变PSI中的主体色素(bulk chlorophyll)和长波色素或红色素(red chlorophyll)之间的能量分布。它们的作用导致激发能分配失衡,使更多的激发能分配到红色素。 4.甘油和蔗糖的作用还会影响PSI的蛋白质构象。甘油使PSI蛋白质内部的色氨酸残基(Trpapolar)处于更加疏水的微环境,而蔗糖却使极性环境中的色氨酸残基(Trppolar)周围微环境的极性继续增大。它们均会使色氨酸残基邻近的具有淬灭活性的蛋白质的位置和/或方向有所变化。同时,甘油和蔗糖的作用也会导致PSI的疏水性增加。

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光系统I(photosystem I,PSI)是光合膜上参与光合作用原初反应过程的主要膜蛋白超分子复合体之一。高等植物的PSI是由核心复合体(14个亚基)和捕光色素蛋白复合体I(light-harvesting complex I, LHCI,含4个Lhca蛋白)组成的超分子复合体,它的主要功能是调节光诱导的从囊腔侧的质体兰素(plastocyanin,PC)向基质侧的铁氧还蛋白(ferredoxin,Fd)的电子传递。研究PSI的结构与功能对于揭示植物光合作用高效吸能、传能的分子机理具有重要意义。在本文中,我们首先建立了分离制备PSI及其亚组分的方法(Qin et al., 2007),并在此基础上对PSI在强光破坏的过程中结构与功能的变化进行了比较深入的研究。本论文的主要研究结果如下: 1.快速、高效分离纯化PSI及其亚组分方法的建立。 国际上传统的PSI分离方法(Bassi and Simpson, 1987; Croce et al., 1998; Påsllon et al.1995; Schmid et al. 2002),耗时长较长(分离PSI颗粒一般需要多于20h的蔗糖超速离心过程,而分离PSI的亚组分则需要25-60h的蔗糖超速离心过程)、得率较低,这不便于PSI方面的研究,为此我们首先改进了传统的分离纯化方法。新方法以高等植物菠菜叶片作为原材料,使用Triton X-100作为增溶剂,通过差速离心技术获得的粗制品,然后使用十二烷基麦芽糖苷(n-Dodecyl β-D-maltoside, DDM)增溶PSI粗制品,之后采用100,000×g,垂直转头(Beckman VTi 50)0.1-1 mol/L蔗糖梯度离心3h获得纯度较高的PSI颗粒。然后使用DDM和3-(N, N-Dimethylpalmitylammonio) propanesulfonate (zw 3-16)两种增溶剂处理PSI,后经100,000×g,垂直转头(Beckman VTi 50)蔗糖梯度离心4h获得纯度较高的PSI core、LHCI-680、LHCI-730复合体。采用吸收光谱、荧光光谱技术研究了各样品的基本光谱学特性,采用HPLC分析了各样品的色素组成,结果显示平均每个Lhca蛋白结合1.5-1.6黄体素,1.0紫黄质, 0.8-1.1 β-胡萝卜素,该方法制备的LHCI比传统方法制备的LHCI减少了类胡萝卜素的丢失。这一工作为以后结构与功能的研究工作奠定了良好的基础。 2.PSI复合体及其亚组分的特性研究。 PSI颗粒具有一定的适应环境酸碱变化的能力,在我们的试验条件下PSI颗粒在pH 5-10相对稳定。PSI、LHCI很难通过加入Mg2+、Ca2+、Na+阳离子聚集沉淀。经绿胶鉴定我们制备的LHCI-680、LHCI-730是二聚体形式;而把PSI绿胶后再进行第二向十二烷基硫酸钠-聚丙烯酰氨凝胶电泳(SDS-PAGE)电泳,结果发现在稍强烈的绿胶增溶条件下,LHCI-730是以二聚体的形式存在,但是LHCI-680却是以单体的形式出现。这说明LHCI形成的二聚体,尤其是LHCI-680,较容易受到增溶处理而分离成单体形式,解释了以生化分离手段得到的LHCI-680的聚集形式是单体还是二聚体这个目前国际上还有有争议的问题。 3.PSI、LHCI光破坏的基本特点。 采用白光(2500 μmol•m-2•s-1)照射PSI颗粒,通过SDS-PAGE及室温吸收光谱检测光照过程中PSI复合体的变化,结果表明:去氧处理能够大大延缓PSI的光破坏,而PSI脱辅基蛋白不会发生光破坏,这说明PSI发生的光破坏可能与Chl与O2的相互作用有关。采用白光(1000 μmol•m-2•s-1、300 μmol•m-2•s-1)处理LHCI-680、LHCI-730,发现LHCI-680被破坏的速度明显快于LHCI-730被破坏的速度,这是首次在体外分离的水平上揭示了不同LHCI光破坏方面的差异。LHCI-680与LHCI-730在光破坏方面的差异可能与两种天线蛋白结合的类胡萝卜素的种类和数量不同有关,还可能与二者结合的长波长Chl的情况有关,但是具体的原因还有待于进一步的研究。 4.结合不同的捕光色素蛋白复合体(light-harvesting complex,LHC)对PSI光破坏的影响。 为了研究结合不同的捕光天线对PSI光破坏的影响,我们制备了PSI-LHCII、PSIPSI core三种复合体。使用白光(2500 μmol•m-2•s-1)照射这三种复合体,并通过测定各复合体在光破坏过程中蛋白亚基、吸收光谱、PSI活性及P700含量的变化,对比三者光破坏的速度,结果发现PSI-LHCII在这三种复合体中光破坏速度最快,而PSIPSI core两种复合体光破坏速度基本一致。我们推测在光照过程中部分光系统II捕光Chl a/b蛋白复合体II(light-harvesting complex II,LHCII)能够向PSI core传递能量,另外PSI-LHCII绿胶分析的结果表明发生了LHCII三聚体向单体的转变,这种强光下发生的LHCII聚合形式的转化可能是高光强下调节光能捕获的一种机制,由于植物体内具有较完整的保护系统,体内PSI-LHCII的光破坏可能与体外情况不同;另外LHCI与PSI core的解离可能发生在强光照射的早期,具有保护PSI core减少光破坏的积极作用。该部分的研究首次观察了结合不同的捕光天线对PSI光破坏的影响。

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磷脂酰甘油(PG)是光系统I(PSI)中唯一的磷脂,也是PSI重要的组成部分。在本工作中,我们通过改变PSI中PG的含量(体外重组至PG脂质体或专一性磷脂酶降解),研究了PG对PSI的调控作用。主要结果如下: 1. 外加PG导致PSI色素的结合状态和激子相互作用发生改变。吸收光谱中,Chl a特征峰蓝移且吸收降低。低温荧光光谱中,680nm处的峰逐渐明显,F730-735 /F680的比值下降,LHCI-730激发峰蓝移。可视CD光谱中Chl a、Chl b蓝移,它们的相互作用增强;类胡萝卜素分子发生红移。 2. PSI的重组引起了PSI蛋白质结构的改变,即蛋白的α-螺旋结构增加而无序结构含量减少。同时,PSI蛋白质内部的色氨酸残基处于更极性的环境。 3. PG对PSI的电子传递的影响具有浓度效应。低浓度时可以促进PSI的电子传递活性,而在相对较高浓度时抑制PSI的电子传递。 4. PLA2的处理导致PSI中PG的缺失,抑制了PSI反应中心P700的暗还原反应,即延长了其还原所用的时间。P700的暗还原反应存在快相和慢相两相反应。PG的缺失降低了这两相反应的反应速率,抑制了电子从质体蓝素(PC)到P700+的传递。

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PSII是一个叶绿体类囊体膜的蛋白复合体,它由20多个蛋白亚基组成,这些蛋白由核基因和叶绿体基因共同编码。由于PSII结构的复杂性,PSII的组装是多步骤的,并得到辅因子和调控蛋白的协助。但我们对参与调控步骤的蛋白因子还了解不多。鉴于叶绿体有限的编码能力,推测参与叶绿体组装调控的因子主要是由核基因来编码的。辨定这些核编码的叶绿体蛋白并深入研究其作用的分子机制将有助于我们了解PSII生物发生的分子机理。为此,我们利用叶绿素荧光成像系统对pER16 T-DNA插入突变体库进行了筛选,并对高荧光突变体lpa3进行了研究。主要研究结果如下: 突变体lpa3生长较为缓慢,叶色黄绿,叶绿素含量低。在突变体中,最大荧光量子产率Fv/Fm降低到0.514,表明PSII光合功能受到了损伤。突变体lpa3叶绿素荧光慢诱导曲线的正常下降表明PSII后的电子传递正常。突变体P700氧化还原动力学与野生型一致,则进一步表明PSI在突变体中是具有功能的。77K发射荧光光谱显示PSII的特征峰在突变体中较高,而PSI的特征荧光峰没有变化,则进一步显示突变体lpa3是一个PSII突变体。 通过Tail-PCR,发现突变体中T-DNA插入导致基因lpa3缺失表达,并且lpa3基因的互补可以使突变体的性状得到恢复。该基因表达的蛋白LPA3含有一个跨膜区域,是一个类囊体膜蛋白。该蛋白不是PSII的蛋白组成成分,可能与自身或者其它的蛋白组成一个复合体而起作用。 在突变体lpa3中PSII蛋白质尤其是核心蛋白D1、D2,含量下降。并且突变体中PSII蛋白复合体含量下降。但是突变体中PSII基因的表达并没有在转录水平受到调节,并且蛋白D1和D2的翻译起始也没有受到影响。体外标记实验表明,PSII中D1蛋白的合成明显降低,而其它蛋白的合成没有改变。进一步实验表明,突变体中PSII的组装效率降低。推测D1蛋白由于不能有效组装而反馈调节自身的合成。 酵母双杂交实验表明LPA3蛋白可以与D1蛋白相互作用,并且也与参与PSII组装的蛋白Alb3相互作用。因此,LPA3蛋白可能和蛋白Alb3形成一个复合体,该复合体与D1蛋白直接相互作用而参与调控PSII的组装。

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光系统I与光系统II ( PSIPSII ) 是由核基因与叶绿体基因共同编码的蛋白组成的多亚基色素蛋白复合体,其复合物组装过程中蛋白以一定地次序合成并组装。现有研究表明光合膜多亚基复合物形成的每一个过程都需要一个或多个调节因子的参与。发现这些调节因子,并研究它们的作用机制将有助于我们认识高等植物两个光系统复合物组装和功能调控的分子机理。因此,我们采用正向遗传学和反向遗传学方法去寻找这些调控因子。我们一方面应用Gateway技术构建拟南芥cDNA表达文库,采用酵母双杂交技术从中筛选与Alb3互作的蛋白,称为ALIP ( Albino3 Interacting Protein );从ABRC订购编码这些互作蛋白的基因的T-DNA插入突变株系,其中发现了一个影响PSI功能的突变体alip1;另一方面,通过对拟南芥T-DNA插入突变体库进行筛选,发现了一批影响PSII功能的突变体 ( low photosystem II accumulation ),其中包括lpa1、lpa2和lpa66-1。本实验对alip1和lpa66-1突变体进行了深入研究,初步探讨了这两个基因编码的蛋白参与调控PSI以及PSII的组装机理。 突变体lpa66-1是一个高叶绿素荧光突变体,与野生型比较生长缓慢,叶色黄,叶绿素含量低。叶绿素荧光慢诱导曲线显示它是一个影响PSII功能的突变体。类囊体膜蛋白的免疫印迹发现lpa66-1突变体中PSII复合物的累积量降低到野生型的30%左右,其他复合物的含量变化不大。体内蛋白标记实验显示,PSII反应中心蛋白D1,D2的合成速率下降,PSII核心蛋白的周转加快。新合成的蛋白组装进PSII的效率比野生型显著降低。LPA66是一个定位于叶绿体的PPR蛋白。因为野生型拟南芥LPA66蛋白能够特异性的编辑psbF转录本,故野生型psbF转录本中第77C被编辑为77U,从而使相应的氨基酸序列中第26个氨基酸丝氨酸被编辑为苯丙氨酸,而lpa66-1突变体中,LPA66蛋白的缺失导致该位点不能被编辑,PSII复合体也不能有效组装。 Alb3/Oxa1p/YidC蛋白家族广泛的参与蛋白质转运和多亚基复合物组装,采用分裂泛素化酵母双杂交发现与Alb3相互作用蛋白ALIP1。突变体alip1也是一个高叶绿素荧光突变体,叶色黄,在土里生长极为缓慢,且不能开花,不育。叶绿素荧光慢诱导曲线显示,突变体中PSII功能基本没有受影响;而P700显示alip1是一个影响PSI功能的突变体。类囊体膜蛋白的免疫印迹发现突变体中PSI核心蛋白PsaA/B的累积量为野生型的40%左右,而PSII及其他复合物的含量无明显变化。Northern印迹结果显示PsaA/B在转录水平不受影响,而体内蛋白标记实验显示,PSI反应中心蛋白PsaA/B的合成速度下降。蔗糖密度梯度离心分析类囊体膜蛋白的组分显示ALIP1能够与Alb3共迁移。而Alb3对于类囊体膜上大分子复合体的组装有重要作用,我们推测,ALIP1可能与Alb3形成一个复合物,或者作为一个中间体介导Alb3参与PSI的组装。

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Gaining insight into the mechanisms of chemoreception in aphids is of primary importance for both integrative studies on the evolution of host plant specialization and applied research in pest control management because aphids rely on their sense of smell

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报道了美姑脊蛇Achalinus meiguensis线粒体基因组全序列.美姑脊蛇线粒体全序列长17239bp,由22个tRNA,2个rRNA和13个蛋白质基因及2个非编码的控制区或D-loop组成,存在着基因重排现象.对已报道蛇类线粒体基因组全序列进行比对分析后,发现一些蛇类线粒体基因组进化规律:双控制区现象在爬行动物进化历史中独立地发生,有不同的演化历史;tRNA假基因是在真蛇下目(Caenophidia)中进化形成的;TΨC臂的相对较短(一般少于5bp)和缺失"DHU"臂造成蛇类tRNA较短.通过M

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收集人工条件下培养的葛仙米球形群体,以不同浓度的NaCl溶液处理,当浓度超过0.2mol/L后,叶绿素a荧光的可变部分(Fv)与最大荧光(Fm)之比值(Fv/Fm)与NaCl浓度呈负相关,光合放氧速率也随着NaCl浓度升高而降低.这两者随氯化钠浓度升高而降低的趋势均呈现出两个阶段性:低NaCl浓度时的缓慢降低阶段和高NaCl浓度时的快速降低阶段.Fv/Fm比值的转折点在0.2mol/L,而光合放氧速率的在0.4mol/L,后者与海水的浓度接近.呼吸作用几乎不受NaCl的影响.光系统I(PSI)和光系统II

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对经空间飞行搭载而获得的通罗鱼腥藻突变株的分析发现,与对照相比,它在生长率和光合效率方面明显较高.进一步分析其光合色素的组成,叶绿素荧光及PSII/PSI比值,发现突变株的PC/Chl比值明显低于对照藻株,而叶绿素荧光高于对照,PSII/PSI比值是对照藻株的1.7倍,在其它光合色素的比例上也有差异.分析这些结果表明,突变株与对照株在光合特征上有差异可能是突变株在色素系统的改变引起光能捕捉和光能利用上更为高效的原因.

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The mitochondrial genome complete sequence of Achalinus meiguensis was reported for the first time in the present study. The complete mitochondrial genome of A. meiguensis is 17239 bp in length and contains 13 protein-coding genes, 22 tRNA, 2 rRNA, and 2 non-coding regions (Control regions). On the basis of comparison with the other complete mitochondrial sequences reported, we explored the characteristic of structure and evolution. For example, duplication control regions independently occurred in the evolutionary history of reptiles; the pseudo-tRNA of snakes occurred in the Caenophidia; snake is shorter than other vertebrates in the length of tRNA because of the truncations of T psi C arm (less than 5 bp) and "DHU" arm. The phylogenic analysis by MP and BI analysis showed that the phylogenetic position of A. meiguensis was placed in Caenophidia as a sister group to other advanced snakes with the exclusion of Acrochordus granulatus which was rooted in the Caenophidia. Therefore we suggested that the subfamily Xenodermatinae, which contains A. meiguensis, should be raised to a family rank or higher rank. At the same time, based on the phylogenic statistic test, the tree of Bayesian was used for estimating the divergence time. The results showed that the divergence time between Henophidia and Caenophidia was 109.50 Mya; 106.18 Mya for divergence between Acrochordus granulatus and the other snakes of the Caenophidia; the divergence time of A. meiguensis was 103 Mya, and Viperidae diverged from the unilateral of Elapidae and Colubridae was 96.06 Mya.

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A vipp1 mutant of Synechocystis sp. PCC 6803 could not be completely segregated under either mixotrophic or heterotrophic conditions. A vipp1 gene with a copper-regulated promoter (P-petE-vipp1) was integrated into a neutral platform in the genome of the merodiploid mutant. The copper-induced expression of P-petE-vipp1 allowed a complete segregation of the vipp1 mutant and observation of the phenotype of Synechocystis 6803 with different levels of vesicle-inducing protein in plastids 1 (Vipp1). When P-petE-vipp1 was turned off by copper deprivation, Synechocystis lost Vipp1 and photosynthetic activity almost simultaneously, and at a later stage, thylakoid membranes and cell viability. The photosystem II (PSII)-mediated electron transfer was much more rapidly reduced than the PSI-mediated electron transfer. By testing a series of concentrations, we found that P-petE-vipp1 cells grown in medium with 0.025 mu M Cu2+ showed no reduction of thylakoid membranes, but greatly reduced photosynthetic activity and viability. These results suggested that in contrast to a previous report, the loss of photosynthetic activity may not have been due to the loss of thylakoid membranes, but may have been caused more directly by the loss of Vipp1 in Synechocystis 6803.

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When tobacco BY-2 cells were treated with 60 mu g/mL MC-RR for 5 d, time-dependent effects of MC-RR on the cells were observed. Morphological changes such as abnormal elongation, evident chromatin condensation and margination, fragmentation of nucleus and formation of apoptotic-like bodies suggest that 60 mu g/mL MC-RR induced rapid apoptosis in tobacco BY-2 cells. Moreover, there was a significant and rapid increase of ROS level before the loss of mitochondrial membrane potential (Delta Psi(m)) and the onset of cell apoptosis. Ascorbic acid (AsA), a major primary antioxidant, prevented the increase of ROS generation, blocked the decrease in Delta Psi(m) and subsequent cell apoptosis, indicating a critical role of ROS in serving as an important signaling molecule by causing a reduction of Delta Psi(m) and MC-RR-induced tobacco BY-2 cell apoptosis. In addition, a specific mitochondrial permeability transition pores (PTP) inhibitor, cyclosporin A (CsA), significantly blocked the MC-RR-induced ROS formation, loss of Delta Psi(m), as well as cell apoptosis when the cells were MC-RR stressed for 3 d, suggesting that PTP is involved in 60 mu g/mL MC-RR-induced tobacco cell apoptosis signalling process. Thus, we concluded that the mechanism of MC-RR-induced apoptosis signalling pathways in tobacco BY-2 cells involves not only the excess generation of ROS and oxidative stress, but also the opening of PTP inducing loss of mitochondrial membrane potential. (C) 2007 Published by Elsevier Ltd.

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A fish cell line, fathead minnow (FHM) cell, was used to investigate the alteration of mitochondrial dynamics and the mechanism of apoptosis under Rana grylio virus (RGV) infection. Microscopy observations, flow-cytometry analysis and molecular marker detection revealed the apoptotic fate of the RGV-infected cells. Some typical apoptotic characteristics, such as chromatin condensation, DNA fragmentation and mitochondrial fragmentation, were observed, and significantly morphological changes of mitochondria, including size, shape, internal structure and distribution, were revealed. The mitochondria in RGV-infected cells were aggregated around the viromatrix, and the aggregation could be blocked by colchicine. Moreover, the Delta psi m collapse was induced, and caspase-9 and caspase-3 were activated in the RGV-infected cells. In addition, NF-kappa B activation and intracellular Ca2+ increase were also detected at different times after infection. The data revealed the detailed dynamics of mitochondrion-mediated apoptosis induced by an iridovirus, and provided the first report on mitochondrial fragmentation during virus-induced apoptosis in fish cells.

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A new discrimination method for the maize seed varieties based on the near-infrared spectroscopy was proposed. The reflectance spectra of maize seeds were obtained by a FT-NIR spectrometer (12 000-4 000 cm(-1)). The original spectra data were preprocessed by first derivative method. Then the principal component analysis (PCA) was used to compress the spectra data. The principal components with the cumulate reliabilities more than 80% were used to build the discrimination models. The model was established by Psi-3 neuron based on biomimetic pattern recognition (BPR). Especially, the parameter of the covering index was proposed to assist to discriminating the variety of a seed sample. The authors tested the discrimination capability of the model through four groups of experiments. There were 10, 18, 26 and 34 varieties training the discrimination models in these experiments, respectively. Additionally, another seven maize varieties and nine wheat varieties were used to test the capability of the models to reject the varieties not participating in training the models. Each group of the experiment was repeated three times by selecting different training samples at random. The correct classification rates of the models in the four-group experiments were above 91. 8%. The correct rejection rates for the varieties not participating in training the models all attained above 95%. Furthermore, the performance of the discrimination models did not change obviously when using the different training samples. The results showed that this discrimination method can not only effectively recognize the maize seed varieties, but also reject the varieties not participating in training the model. It may be practical in the discrimination of maize seed varieties.

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本文从3-硝基苯酐出发合成了3-位异构体的聚酰亚胺如:3,3'PTI-PoP,3,3'-PEI-PoP,3,3'-PSI-PoP。并利用本实验室已有的4-位异构体双酐,与3-位异构体双酐按不同比例混合分别与4,4'-二胺基二苯醚(简称PoP)共聚获得一系列共聚产物,此外还合成了尚未完见文献报导的3,4'-PTI-PoP,并对由不同异构体双酐获得的聚酰亚胺的性能进行了全面系统地研究与比较。考察了3-位异构体和4-位异构体所获得的聚酰胺酸溶液的稳定性,发现3-位异构体的聚酰胺酸比4-位异构体降解得快。用热分析法研究了聚酰亚胺的热稳定性,可以发现,PTI-PoP是具有最高的热稳定性。开始分解温度在530 ℃以上,属于最耐热聚合物的一种。PEI-PoP分解温度在500 PoP以上。PSI-PoP的热稳定性低于前二者。另一个现象是热稳定性与异构体无关,3-位和4-位异构体聚合物具有相当一致的稳定性。此外含有硫醚的聚酰亚胺的热稳定性高于含氧醚链的聚合物。PEI-PoP具有相当突击的韧性,且其韧性与异构体无明显关系,而PTI-PoP的韧性却决定于异构体的结构。4,4'-PTI-PoP具有较好的韧性,但3,3'-PTI-PoP就显得较脆,共聚物的韧性随4-位异构体组成的增加韧性增大。有趣的是3,4'-PTI-PoP具有较好的韧性。玻璃化转变温度系PSI-PoP最高,3,3'-PSI-PoP的T_g高于350 ℃,4,4'-PSI-PoP最低,3,3'-PEI-PoP的T-g高于4,4'-PEI-PoP。共聚物的T_g随4-位异构体含量的增加而降低。PEI-PoP耐光水学性能良好,PTI-PoP次之,其中4,4'-PEI-PoP优于3,3'-PEI-PoP;4,4'-PTI-PoP又好于3,3'-PTI-PoP。突出表现在4,4'-PEI-PoP和4,4'-PTI-PoP能够耐氯仿,而3,3'-PEI-PoP和3,3'-PTI-PoP氯仿则是它们的良溶剂。4,4'-PTI-PoP比3,3'-PTI-PoP耐碱。由不同异构体又酐所获得的聚酰亚胺的动态力学行为各异。3,3'-PTI-PoP和3,3'-PEI-PoP在到达玻璃化温度之前无明显的β-次转变峰,而4,4'-PTI-PoP和4,4'-PEI-PoP在50~200 ℃范围内有一个很宽的次转变峰。共聚物的次转变峰面积随异构体组成的不同而规律地变化,4-位异构体含量增加,面积增大。另外随温度升高,在T_g之前,贮能模量下降百分率也有规律可循,3,3'-PEI-PoP和3,3'-PTI-PoP分别比4,4'-PEI-PoP和4,4'-PTI-PoP下降幅度小。共聚物中,随4-位异构体含量的增加,模量下降百分率增大。3,4'-PTI-PoP的动态力学谱类似PTI-PoP共聚物,出现β-次转变峰,而其T_g高于4,4'-PTI-PoP低于3,3'-PTI-PoP.