为了更好地研究管线钢在土壤溶液中的腐蚀机理,为其防腐蚀措施的制订提供理论依据,采用四点弯曲法,结合动电位极化和电化学交流阻抗等电化学测试技术研究了近中性模拟土壤溶液中应力、温度以及主要离子浓度等因素对X80钢应力腐蚀行为的...为了更好地研究管线钢在土壤溶液中的腐蚀机理,为其防腐蚀措施的制订提供理论依据,采用四点弯曲法,结合动电位极化和电化学交流阻抗等电化学测试技术研究了近中性模拟土壤溶液中应力、温度以及主要离子浓度等因素对X80钢应力腐蚀行为的影响。结果表明:在NS4溶液中,应力变化对于Ecorr的影响很小,其仅在15 m V内波动;温度对腐蚀速率的影响呈现规律性变化,即温度升高,X80钢的腐蚀速率增大;外加应力存在时,随Cl-浓度的增加,其自腐蚀电位Ecorr和腐蚀速率变化较大,均比无应力时的高;在较低HCO3-存在的条件下,HCO3-有促进腐蚀加剧的作用。展开更多
The rice mutant ossac4(starch accumulating 4)was raised from seeds of the rice(Oryza sativa L.)indica maintainer line Xinong 1B treated with ethyl methanesulfonate.The distal and medial portions of the second leaf dis...The rice mutant ossac4(starch accumulating 4)was raised from seeds of the rice(Oryza sativa L.)indica maintainer line Xinong 1B treated with ethyl methanesulfonate.The distal and medial portions of the second leaf displayed premature senescence in the ossac4 mutant at the four-leaf stage.Physiological and biochemical analysis,and cytological examination revealed that the ossac4 mutant exhibited the premature leaf senescence phenotype.At the four-leaf stage,the leaves of the ossac4 mutant exhibited significantly increased contents of starch compared with those of the wild type(WT).Quantitative real-time PCR analysis showed that the expression levels of photosynthesis-associated genes were down-regulated and the expression levels of glucose metabolism-associated genes were abnormal.Genetic analysis indicated that the ossac4 mutation was controlled by a single recessive nuclear gene.The OsSAC4 gene was localized to a 322.7-kb interval between the simple-sequence repeat marker XYH11-90 and the single-nucleotide polymorphism marker SNP5300 on chromosome 11.The target interval contained 20 annotated genes.The present results demonstrated that ossac4 represents a novel starch accumulation and premature leaf senescence mutant,and lays the foundation for cloning and functional analysis of OsSAC4.展开更多
文摘为了更好地研究管线钢在土壤溶液中的腐蚀机理,为其防腐蚀措施的制订提供理论依据,采用四点弯曲法,结合动电位极化和电化学交流阻抗等电化学测试技术研究了近中性模拟土壤溶液中应力、温度以及主要离子浓度等因素对X80钢应力腐蚀行为的影响。结果表明:在NS4溶液中,应力变化对于Ecorr的影响很小,其仅在15 m V内波动;温度对腐蚀速率的影响呈现规律性变化,即温度升高,X80钢的腐蚀速率增大;外加应力存在时,随Cl-浓度的增加,其自腐蚀电位Ecorr和腐蚀速率变化较大,均比无应力时的高;在较低HCO3-存在的条件下,HCO3-有促进腐蚀加剧的作用。
基金This work was supported by the National Key Research and Development Program of China(2017YFD0100201)the Project of Chongqing Science&Technology Commission Grants,China(CSTCCXLJRC201713and CSTC2016SHMS-ZTZx0017)and the Fundamental Research Funds for the Central Universities,China(XDJK2017C030).
文摘The rice mutant ossac4(starch accumulating 4)was raised from seeds of the rice(Oryza sativa L.)indica maintainer line Xinong 1B treated with ethyl methanesulfonate.The distal and medial portions of the second leaf displayed premature senescence in the ossac4 mutant at the four-leaf stage.Physiological and biochemical analysis,and cytological examination revealed that the ossac4 mutant exhibited the premature leaf senescence phenotype.At the four-leaf stage,the leaves of the ossac4 mutant exhibited significantly increased contents of starch compared with those of the wild type(WT).Quantitative real-time PCR analysis showed that the expression levels of photosynthesis-associated genes were down-regulated and the expression levels of glucose metabolism-associated genes were abnormal.Genetic analysis indicated that the ossac4 mutation was controlled by a single recessive nuclear gene.The OsSAC4 gene was localized to a 322.7-kb interval between the simple-sequence repeat marker XYH11-90 and the single-nucleotide polymorphism marker SNP5300 on chromosome 11.The target interval contained 20 annotated genes.The present results demonstrated that ossac4 represents a novel starch accumulation and premature leaf senescence mutant,and lays the foundation for cloning and functional analysis of OsSAC4.
