番茄品系红熟果实的耐贮性与品质的通径分析     

陈贤  王再强  关文灵  杨德 《北方园艺》2007,(7):18-20

对11个番茄品系红熟果实在2因子4处理条件下贮藏21 d的变质率与采收时的果实品质性状进行通径分析,结果表明:变质率与果实采收时的营养成分的干物质、水分、可溶性固形物含量、糖酸比有关,其中果实干物质含量是果实变质率最重要的影响因子,其效应是由直接作用引起的.  相似文献   

几种抑制木薯采后生理性变质发生方法的比较     

弓淑芬 《热带作物学报》2013,33(11):1-4

比较了热激、酸化和隔绝氧气3种处理对木薯采后生理性变质的影响，结果显示，热激和酸化都能在一定程度上延缓木薯PPD的发生，隔绝氧气是最为理想的抑制木薯PPD发生的方法。因此，通过过量表达或者干扰某些基因表达，降低以至于去除伤口处的氧气的方法将是防治木薯采后生理性变质的有效途径。  相似文献   

失水对青皮种子劣变的影响^*   总被引：5，自引：1，他引：5       下载免费PDF全文

刘文明  宋学之 《林业科学研究》1993,6(2):162-166

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引种栽培西蒙得木的适应性研究Ⅰ——生物学习性观察及枯萎病研究     

赵光材 《热带农业科技》2007,30(3):43-47

概述了西蒙得木的经济价值和国内外发展状况,根据在云南发展中出现连续枯萎死亡的现象,首先研究了生物学习性和生态适应性,分离接种了来自病健根的菌类,得到的4种镰刀菌都要在根系衰弱时才能侵染根系,引起根系衰弱的原因需要进一步研究。  相似文献   

沥青混凝土桥面铺装早期病害原因的分析     

李国芬  侯彦明  朱华平 《森林工程》2007,23(2):62-64

对混凝土桥梁沥青砼桥面铺装的早期病害及其原因进行了分析与研究，在总结当前国内桥面铺装结构主要方法的基础上，通过理论分析，提出了用有限元进行结构受力分析以及需要重点研究分析的几个方面的问题。  相似文献   

THE MECHANISM OF SEED DETERIORATION     

Liu Enju Feng Yulong Sun Hongzhi Northeast Forestry University 《林业研究》1993,4(1):6-10

Seed deterioration is an irresistible physiological phenomenon.The aim to studyseed deterioration is to see if seed deterioration can be retarded artificially and the higher seedvigor of fine varieties be maintained.The change of seed deterioration occurs in almost every sys-tem,and affects many kinds of enzyme and almost all organelle,as a result,the seed loses its vig-or.The reason of seed deterioration and the lost of seed vigor are mainly studied and discussed inthis paper.According to the external and internal two kinds of theory advanced by E.H.Roberts,Much deep discussions are made from the view of biochemistry.  相似文献   

大豆种子抗劣变性的鉴定方法研究   总被引：3，自引：0，他引：3  

寿惠霞  宋文坚 《种子》1999,(2):3-5

以抗种子劣变性不同的５个栽培大豆和５个野生大豆品种为材料，比较了高温湿（相对湿度１００％，温度４０℃）条件下贮藏３天、７天、１０天和１４天及２０％的甲醇浸泡２小时等５种种子加速第化方法鉴定了种子抗劣变性的效果。结果表明，高温高湿老化７－１０天和２０％的甲醇浸泡２小时，可鉴定出大豆种子抗劣变性。  相似文献   

Effect of Reinforced-Concrete Deterioration on Structures     

CHEN Zhao? hui  HUANG He 《保鲜与加工》2003,(2):42-46

s:It is proposed that the research of the structural durability is necessary considering the structural damages under the effect of deterioration of reinforced concrete. The most common reasons, which cause the deterioration of structures in China, are reinforcement corrosion and freeze thaw cycles of concrete. Based on the summarizing of research works of the effect of reinforced concrete deterioration on structures, it is indicated that the structural durability research should be carried out either in view of material science or that of structural science, and should be also considered the interaction of several factors with uncertain nature instead of the determined individual factor analysis. The structural durability of serviceable should be paid much more attention while researching the durability of structural capacity. The effect of reinforced concrete deterioration on structural capacity, rigidity and durability should be researched henceforth.  相似文献   

Effect of acid rain on sandstone: The Royal Palace and the Riddarholm church,Stockholm     

A. G. Nord  K. Tronner 《Water, air, and soil pollution》1995,85(4):2719-2724

The deterioration of two kinds of sandstone is discussed for two 18:th century buildings in central Stockholm: the Royal Palace, and the Royal Carolean Burial Chapel (Karolinska gravkoret) annexed to the mediaeval Riddarholm church. The facades of calcitic Gotland sandstone show many signs of serious decay, such as gypsum formation, pulverized surface, exfoliation, discolouration, and salt efflorescence. The socles are built of the more resistant quartzitic Roslagen sandstone, displaying some discolouration, cracks, and slight exfoliation. In total about 300 samples have been analysed. The surface concentration of sulphur is highest at ground level and at rain-sheltered positions. Chemical and sulphur isotope data indicate that the stone decay to a large part may be attributed to anthropogenic sources like acid deposition and car traffic.  相似文献   

夏秋季市售新鲜猪肉变质程度与存放时间关系初探     

漆君  徐庚全  熊启峨  陶得知  王权  张竞存 《甘肃农业大学学报》1993,(2)

试验表明,市售新鲜猪肉,在气温23～31℃,相对湿度54％～93％的自然条件下,存放36h开始变为次鲜级,48h开始变质。以感官检查为标准,7项实验室检验中,以TVB-N符合最佳,依次是Pr、E、NH_3、ET、H_2S,pH符合最差。以TVB-N检验为标准,其它6项检验中,Pr、E、NH_3及感官检查结果最为接近。且据11个组合的平行程度,市售鲜猪肉新鲜度的实验室检验应以TVB-N、NH_3、Pr检验为主要项目。  相似文献