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随着社会经济的快速发展和生活水平的不断提高,人们对木质家具及其他木制品的需求及质量要求日益提高。木材干燥作为保证木制品质量的重要环节愈来愈被木制品加工企业所重视,木制品加工企业寻求高智能全自动木材干燥设备的愿望越来越迫切。 相似文献
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橡胶叶水浸提液对花生幼苗早期根系形态及其生理特性的影响 总被引:1,自引:0,他引:1
为深入理解橡胶树的化感抑制作用,采用适当浓度的橡胶叶水浸提液处理刚萌动的花生种子10 d,测定花生幼苗早期根系形态及其生理指标。结果表明:橡胶叶水浸提液能显著降低花生幼苗胚根长度、苗高、根鲜重、地上部鲜重以及根冠比,对根生长的抑制作用比地上部强烈;能显著降低根系总长、根表面积、根体积和根尖数,但对根平均直径有轻微的促进作用,与对照相比,差异不显著;能显著降低根系SOD、POD、CAT活性、可溶性蛋白质、可溶性糖、脯氨酸含量以及根系活力,却明显增加根系MDA含量和相对电导率。说明橡胶叶水浸提液可通过破坏花生幼苗的抗氧化防御机制,降低其渗透调节能力,减少根系的吸收面积,抑制根系的吸收活性来抑制花生幼苗的生长。 相似文献
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We designed and synthesized two pairs of specific primers amplified S1 gene by RT-PCR method to investigate the variation in S1 genes of porcine epidemic diarrhea virus (PEDV) in 2012 in Henan.S1 genes of 5 PEDV strains were cloned and sequenced, and their phylogenetic trees were analyzed from different swine breeding farms. Sequences analysis showed that S1 genes shared 98.3% to 99.5% nucleotide identities and 97.1% to 98.9% amino acids homologies among five PEDV isolates. Compared with domestic landing PEDV from 2011, the nucleotide homologies were 88.6% to 98.0% and amino acid homologies were 85.3% to 98.7%. Compared with CV777, the nucleotide homologies were 88.7% to 89.1% and amino acid homologies were 87.3% to 88.4%. Homology analysis showed that S1 genes of 5 isolates shared the same genetic mutation, there were the same insertions and deletions. Compared with domestic mutant strains landed from 2011, there was no tendency. However, compared with CV777, there were three nucleotide insertions from 163 to 166 bp, nine nucleotide insertions from 173 to 174 bp, three nucleotide insertions from 405 to 406 bp and three nucleotide deletions from 463 to 464 bp. These insertions and deletions of nucleotides led to its corresponding changes in encoding amino acids. Phylogenetic analysis showed that S1 genes of 5 PEDV strains belonged to the third group. However compared with part of PEDV first group domestic mutant strains landed in 2011, the nucleotide homologies were 88.6% to 89.3% and amino acid homologies were 85.3% to 86.9%. CV777 was the second group. The results showed that S1 genes of PEDV prevalent strain exist in first and third groups, but mainly prevailing third group strains, the pathogenic and antigenic differences of these strains should be further studied. 相似文献
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高温胁迫下外源茉莉酸甲酯、钙和水杨酸对蝴蝶兰幼苗耐热性的影响 总被引:8,自引:2,他引:6
为了探求外源茉莉酸甲酯、钙和水杨酸对蝴蝶兰耐热性的影响,分别采用最适浓度的3种药液和蒸馏水(对照)喷施蝴蝶兰幼苗叶片,并置于40℃高温胁迫4天,测定了有关生理指标的变化。结果表明:高温胁迫下,与对照处理相比,茉莉酸甲酯、钙处理明显提高了SOD、POD、CAT活性,而水杨酸处理在明显提高了SOD、POD活性的同时,却明显降低了CAT活性;3种处理明显提高了可溶性蛋白质和脯氨酸含量,显著降低了相对电导率和MDA含量。由此认为,茉莉酸甲酯、钙、水杨酸处理能提高蝴蝶兰幼苗的耐热性。根据形态和生理指标的差异性,可得出诱导耐热性强弱的顺序为:茉莉酸甲酯>钙>水杨酸。 相似文献
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一、新经济的特征新经济是相对于"传统经济"或"旧经济"而言的,是指在全球化资源配置和市场开发基础上,以信息和网络技术为支撑,由高新科技产业驱动,以创新为核心,可持续发展的经济,是经济社会发展的一次大调整。新经济主要呈现出以下几方面的特征:新经济是知识化的经济;新经济是创新化的经济;新经济是全球化的经济;新经济是网络化的经济. 相似文献
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一、中国技术人才的现状
技术型人才是指掌握和应用技术手段为社会谋取直接利益的人才。由于技术型人才的任务是为社会谋取直接利益,因而,他们常处于工作现场或生产一线工作。在人类社会劳动的链环中。他们处于工程型人才和技能型人才之间.所以国外也有称之为中间人才。 相似文献
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施肥对五节芒热值和表型性状的影响 总被引:5,自引:1,他引:4
对五节芒Miscanthus floridulus进行施肥措施研究氮肥、磷肥、钾肥对其灰分含量、热值以及表型性状方面的影响。采用正交试验设计,以热值、灰分含量、单株高度、地径、茎叶比、产量等为指标,研究不同氮磷钾配比对五节芒热值和表型性状的调控效应。结果表明,不同施肥水平对叶干质量热值、叶灰分含量、茎灰分含量、单支高度、地径、茎叶比达到显著影响,但对产量影响不显著。氮、磷、钾最佳组合为尿素(300 kg/hm2)+过磷酸钙(600 kg/hm2)+氯化钾(50 kg/hm2)时,五节芒灰分含量低,热值高;氮、磷、钾最佳组合为尿素(300 kg/hm2)+过磷酸钙(200 kg/hm2)+氯化钾(200 kg/hm2)时,五节芒的表型评价指标高。 相似文献