Ca~(2 )对低温下水稻幼苗膜的保护作用

缺Ｃａ２＋的水稻幼苗在低温胁迫下（４℃ ３６ｈ），细胞膜功能及超微结构破坏严重。在培养液中 加入适当浓度的 Ｃａ场＋（０． ５～ １． ０ ｍｍｏｌ／Ｌ）可降低冷胁迫下稻苗的电解质渗漏率和 ＭＤＡ含量，提高 ＳＯＤ、ＣＡＴ、ＰＯＤ活性，保护叶绿体和线粒体超微结构免遭破坏。ＣａＭ特异性抑制剂ＣＰＺ能部分抑制 Ｃａ２＋降低冷害稻苗的电解质渗漏率及ＭＤＡ含量和提高ＳＯＤ、ＰＯＤ活性的作用，暗示Ｃａ２＋对水稻幼苗 膜的保护作用与ＣａＭ有一定关系。     

Ca2+、PEG预处理对干旱胁迫下小麦幼苗某些酶活性的影响

本文结果表明，Ｃａ＾２＋、ＰＥＧ预处理小麦种子具有提高其幼苗ＲＷＣ及ＳＯＤ、ＣＡＴ、ＰＯＤ的活性和降低膜透性的效应，在干旱胁迫下植株生长抑制减轻。随着干旱胁迫的加强、ＳＯＤ、ＣＡＴ、ＰＯＤ活性迅速上升并始终维持较高水平，具体表现为浸种处理ＰＥＧ〉Ｃａ＾２＋〈Ｈ２Ｏ；ＲＷＣ表现为ＰＥＧ〉Ｃａ＾２＋〉Ｈ２Ｏ，植株生长抑制程度表现为ＰＥＧ〈Ｃａ＾２＋〈Ｈ２Ｏ。解除干旱胁迫后，Ｃａ＾２＋，ＰＥＧ浸种处理的     

低温对杂交一代黄瓜幼苗生理特性的影响

对四个黄瓜亲本及其杂交一代（Ｆ１）的生理特性试验研究表明，Ｆ１的相对电导值与双亲的相对电导值呈正相关关系。ＭＤＡ含量在低温处理４８ｈ后上升，７２ｈ后下降，较耐低温亲本的Ｆ１的ＭＤＡ含量低于双亲平均值，不耐低温亲本的Ｆ１的ＭＤＡ含量高于双亲的平均值。２低温处理７２ｈ后ＣＡＴ酶活性下降。ＰＯＤ酶活性上升；ＰＯＤ酶同工酶分析表明，低温处理后酶带数增加，耐低温的Ｆ１酶带增加较多。     

植物低温保护剂对喷药棉苗抗寒力及产量的影响

用ＰＬＴＰＡ（植物低温保护剂）处理棉花幼苗，促进ＳＯＤ、ＰＯＤ、ＣＡＴ活性升高；ＭＤＡ含量降低；抗寒力鉴定结果表明，棉苗可抵抗－２℃～－５℃低温长达１２ｈ不受冻害。这种抗寒力可保持一个月。产量提高     

水分胁迫下蔗叶活性氧代谢的数学分析

水分胁迫加速了蔗叶活性氧的产生并消弱其清除能力。经回归模拟显示，蔗叶ＭＤＡ含量、质膜差别透性、Ｏ２＾－产生速率和组织自动氧化速率均随土壤含水量的降低呈指数增加，ＳＯＤ活性和ＧＳＨ含量呈抛物线变化，而ＣＡＴ活性呈对数降低；逐步回归分析定量地指出了水分胁迫下蔗叶ＳＯＤ和ＣＡＴ在清除活性氧、防止膜脂过氧化和质膜破坏中的协同作用关系，且受Ｏ２＾－产生的影响；经卡方测验证实，该回归模型各参数与大田干旱胁迫的     

缺磷胁迫对大豆膜脂过氧化及保护酶活性的影响

研究大豆不同磷素基因型在缺磷胁迫条件下叶片ＳＯＤ、ＣＡＴ、ＰＯＤ活性及ＭＤＡ含量的变化。结果表明,磷高效基因型‘铁7555’和‘辽豆13号’保护酶活性升高或升幅较大,磷低效基因型‘凤59-15’和‘辽豆11号’则活性下降或变化不明显,低磷胁迫下大豆叶片ＳＯＤ和ＰＯＤ活性升高。     

干旱对小麦幼苗SOD活性和CaM水平的影响

本研究结果表明，干旱引直小麦幼苗中超氧化物歧化酶（ＳＯＤ）活性和丙二醛（ＭＤＡ）含量增高，钙调素（ＣａＭ）水平下降。萎蔫的幼苗复水４天后，ＳＯＤ活性和ＭＤＡ含量又下降，恢复至对照水平，而ＣａＭ含量急剧上升且高于对照。研究还表明，ＳＯＤ可能不ＣａＭ的调节。财时对ＳＯＤ活力测定计算方法也进行了探讨。     

棉花抗氧化系统对黄萎病的反应

本文阐述了棉花抗气化系统及光合、呼吸作用对黄萎病的反应。研究表明，ＣＡＴ和ＰＯＤ对黄萎病反应最早，酶活性变化最大。由于病株ＣＡＴ活性下降导致Ｈ２Ｏ２积累，并引起叶绿体中占主要地位的Ｃｕ／Ｚｎ－ＳＯＤ失活，线粒体中占主要地位的Ｍｎ－ＳＯＤ活性保持相对稳定，与之对应的光合速率下降显著超过呼吸速率。我们认为，ＣＡＴ、ＳＯＤ活性下降既造成了对宿主细胞的伤害，同时也是宿主的防御反应，在宿主－病原菌相互作用过程中，ＣＡＴ活性下降引起的Ｈ２Ｏ２积累是诱导因素。     

甘薯品种抗旱性生理指标及其综合评价初探

采用土壤干旱和室内ＰＥＧ水分胁迫测定相结合的办法，研究有关生理指标与甘薯抗旱性关系，结果表明，水分胁迫下伴随着叶片相对含水量（ＲＷＣ）的明显下降，丙二醛（ＭＤＡ）含量显著增加，质膜相对透性（ＲＰＰ）急剧上升，而过氧化氢酶ＣＡＴ活性迅速下降；抗旱性强的品种叶片ＲＰＰ和ＭＤＡ的增加幅度显著你芋不抗旱品种，而前者叶片ＲＷＣ和ＣＡＴ活性的下速度显著慢于后者，并具有比后者较强的渗透调节能力，中等抗旱品种介乎     

陆地棉功能叶不同生育时期酶活性及脂质过氧化作用的研究

对不同熟性棉花品种功能叶几种酶活性及脂质过氧化水平（以丙二醛含量表示）的研究结果表明，超氧物歧化酶（ＳＯＤ）活性在吐絮前呈波动上升，吐絮盛期争剧下降；丙二醛（ＭＤＡ）含量吐絮前缓慢上升，吐絮后明显增加；过氧化氢酶（ＣＡＴ）活性在结铃以前随叶片发育而上升，结铃后急剧下降；过氧化物酶（ＰＯＤ）活性始终呈上升趋势。进一步对ＰＯＤ同工酶进行电泳发现，其酶谱构成随生育进程而变化，早熟品种在开花期酶带条数最多     

冷冻干燥速溶蛋花汤的加工技术

介绍了运用冷冻干燥技术进行速溶蛋花汤的加工,研究了生产工艺、特点以及影响产品质量的主要因素。试验表明,采用冷冻干燥技术加工的速溶蛋花汤,具有营养丰富、风味独特、方便快捷等特点。     

Measuring of Quantity of Matter-mass and the Measuring of Inertia of Matter-momentclm

A new definition of inertia,i.e. the momentum is the measuring of inertia of matter, is proposed. The article through and etc., subjects, the correctness of the new notion of inertia:The monentum is the measuring of inertia has been demonstrated, and the unsolved contradictions of the traditional definition of inetia. And the mass is the measuring of inertia has been revealed.     

壳聚糖对石榴果汁澄清效果的影响

利用壳聚糖的絮凝作用对壳聚糖在甜石榴汁澄清中的应用效果进行了研究,试验结果表明,壳聚糖用量为0.3g/L、澄清时间为60min、温度为35℃时,甜石榴汁透光率可达85%以上,且通过对壳聚糖处理前后可溶性固形物、总酸、VC等营养成分含量的比较,确定以上工艺参数为甜石榴汁澄清的最佳选择。     

香蕉遗传转化方法研究进展

香蕉是热带亚热带发展中国家重要的粮食作物和碳水化合物来源。但近年来,香蕉生产受到严重的病虫危害。大多数香蕉栽培品种是三倍体,生长周期长,而且不孕。由于没有种子,给繁殖和育种带来一定的困难。遗传转化技术的发展为香蕉品种的改良提供了一种有效的手段。香蕉的遗传转化方法有电激法、基因枪法、农杆菌介导法等。农杆菌介导法的应用是香蕉品种改良的一个重大突破。香蕉遗传转化的外植体也发展到多种,有原生质体,胚性细胞悬浮系,分生组织,以及横切薄片等。近几年,随着分子生物学的发展,出现了转化效率更高,重复性更好的香蕉遗传转化技术。如农杆菌和基因枪结合法,离心辅助农杆菌介导法、真空渗透技术等。这些新技术新方法的出现,必将推动香蕉产业高速发展。     

新疆布尔津县土地利用格局特征研究

基于RS与GIS技术,利用景观生态学理论及景观格局指数对布尔津县土地利用现状进行定量分析。结果显示为：（1）布尔津县以草地、林地为主要景观类型,镶嵌着耕地、水域等景观类型。（2）四个分区（即高山区、丘陵区、平原区、荒漠区）的林地资源组成差异明显,耕地、居民、交通及工矿用地集中分布在丘陵区和平原区（3）从各项指数来看,高山区的多样性指数较低;平原区是受人文因素最多的区域,景观优势度低,各种土地利用类型比例差异不大,有利于生态可持续发展,但要合理的开发利用;荒漠区生态环境相对脆弱,要加强生态环境的保护与改善。通过该研究对布尔津县的土地利用现状作一个了解,为该县乃至整个地区的景观规划和可持续发展战略提供科学依据。     

酸枣幼根原生质体的制备

以生长6～9 d的酸枣种子幼根为试验材料,0.7 mol·L-1甘露醇作为渗透压稳定剂、pH值5.5～6.0、28℃恒温水浴条件下,以光学显微镜观察的水解总时间、初始产生原生质体的时间、原生质体产量及细胞碎片量为指标,研究通过酶水解来制备酸枣幼根原生质体的方法.结果表明,在含1％果胶酶+4％纤维素酶R-10+3％纤维素...     

影响核桃贮藏品质因素的分析

介绍了几种核桃贮藏方法,综述了影响核桃贮藏品质的几个主要因素,以及针对上述影响因素提出若干解决对策.     

Efficiency of water use of early plantings of sunflower

Rain fed crop production in Mediterranean environments depends to a large extent on strategies that avoid the intense summer drought. Early plantings of sunflower have given consistently higher yields in such environments, but the basis for such yield increases has not been explored. We conducted two field experiments at Cordoba (Spain) to investigate the effects of an early and a late planting date on the components of water-limited crop productivity; namely, water use (T), water use efficiency (TE) and harvest index (HI) of sunflower. The results were generalized by simulating rain fed sunflower yields, under early (1 January) and late (15 March) plantings, for a 25-year period with the aid of a simulation model of the Ceres type (OILCROP-SUN) which has been validated in Cordoba. Experimental seed yields of early plantings in 1989 and 1996 were 2.0 and 3.0 t ha⁻¹, while late plantings yields were 1.3 and 2.4 t ha⁻¹, for the 2 years. Average simulated yields were 2.7 ± 1.1 and 1.9 ± 0.7 t ha⁻¹ for early and late plantings, respectively. For the 2 years, T of early plantings was higher than that of late plantings, but the response of TE and HI to planting date was not the same in the two experiments. In the simulation exercise, T and TE of early plantings were consistently higher than those of late plantings, while there were no differences in the HI for the two planting dates. We conclude that early plantings of sunflower increase rain fed yields by increasing both T and TE, while the impact of planting date on HI very much depends on the crop water stress pattern, which is quite variable from year to year even in the predictable Mediterranean environment.     

Establishment of High-frequency Regeneration System of Explants of Alfalfa

The cotyledon and hypocotyl of eight varieties of alfalfa( Medicago sativa L. )are used to study the effect of different cultivation procedures and genotypes on embryogenic callus and embryoid induction,plant development and transplant of alfalfa.The varieties of alfalfa with high embryoid induction rate and high differentiation rate are screened. A high frequency regeneration system for alfalfa tissue culture is established:which is benifical to the gene transformation of alfalfa.     

The Simulation of Comfort of Nine DOF of Automobile

Automobile comfort dynamic simulation is necessary when we predict and evaluate the comfort of a automobile or optimize performance of automobile. The nine DOF vibration model of automobile is established , which acts root mean square value of body in multiple work conditions as comfort evaluation indices. Based on the comfort simulation, the Hongyan 1160 is predicted in the way of comfort. The programmes can be used in many different automobiles . The computational result indicates that the model can simulate vibration of automobile truly. It is significant to research automobile comfort evaluation to optimize performance of automobile and comfort simulation .The computational program can be applied to optimize or simulate which has some reference value.