拟南芥LIKE HETEROCHROMATIN PROTEIN 1(LHP1)/TERMINAL FLOWER2(TFL2)基因被认为是后生动物HP1的同系物。在动物中,HP1通常参与异染色质形成及基因沉默。与HP1不同,LHP1定位于常染色质并抑制位于常染色质中众多基因的表达。拟南芥LHP1/...拟南芥LIKE HETEROCHROMATIN PROTEIN 1(LHP1)/TERMINAL FLOWER2(TFL2)基因被认为是后生动物HP1的同系物。在动物中,HP1通常参与异染色质形成及基因沉默。与HP1不同,LHP1定位于常染色质并抑制位于常染色质中众多基因的表达。拟南芥LHP1/TFL2突变体表现出多重表型,如早花、降低对光周期敏感性、顶端花序和植株矮小。目前对LHP1的研究特别是在单子叶植物水稻中的研究,仅限于蛋白表达谱差异,而未在基因序列及基因表达调控水平上作深入的研究。鉴于拟南芥LHP1的重要功能,今后需对LHP1同源基因在不同物种特别是单子叶植物水稻中的功能进行深入研究;此外,还应加强不同物种LHP1进化的关系分析、LHP1在不同物种整个生育期的表达谱、单子叶植物水稻中lhp1突变体的功能表达及LHP1在开花调控网络中的定位等方面的研究。展开更多
Low-heat Portland(LHP)cement is a new type of Portland cement that has been widely used in recent years due to its low heat of hydration,which makes it exceptional in temperature control for mass concrete construction...Low-heat Portland(LHP)cement is a new type of Portland cement that has been widely used in recent years due to its low heat of hydration,which makes it exceptional in temperature control for mass concrete construction.However,limited studies have investigated the impact of temperature and magnesium oxide(MgO)content on LHP cement-based materials.This study utilizes thermodynamic simulations to study the hydration process,pore structure,and autogenous shrinkage of LHP cement pastes with different water-to-cement ratios(0.3,0.4,and 0.5),curing temperatures(5,15,20,and 30℃),and MgO contents(mass fractions of 2%,4%,and 5%).Higher curing temperature is found to promote the hydration reactions in cement paste.Moreover,the incorporation of 4%MgO moderately decreases both porosity and dimensional shrinkage in pastes.The microstructural evolution of different LHP pastes is examined through a comparative analysis,lending insights into LHP cement-based material applications.展开更多
文摘拟南芥LIKE HETEROCHROMATIN PROTEIN 1(LHP1)/TERMINAL FLOWER2(TFL2)基因被认为是后生动物HP1的同系物。在动物中,HP1通常参与异染色质形成及基因沉默。与HP1不同,LHP1定位于常染色质并抑制位于常染色质中众多基因的表达。拟南芥LHP1/TFL2突变体表现出多重表型,如早花、降低对光周期敏感性、顶端花序和植株矮小。目前对LHP1的研究特别是在单子叶植物水稻中的研究,仅限于蛋白表达谱差异,而未在基因序列及基因表达调控水平上作深入的研究。鉴于拟南芥LHP1的重要功能,今后需对LHP1同源基因在不同物种特别是单子叶植物水稻中的功能进行深入研究;此外,还应加强不同物种LHP1进化的关系分析、LHP1在不同物种整个生育期的表达谱、单子叶植物水稻中lhp1突变体的功能表达及LHP1在开花调控网络中的定位等方面的研究。
基金supported by the National Natural Science Foundation of China(Nos.51602229 and U2040222)the Opening Project of Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education(Tongji University)+1 种基金the Joint Fund Project of Hubei Provincial Natural Science Foundation(No.2023AFD196)the Opening Funding of Henan Key Laboratory of Green Building Materials Manufacturing and Intelligent Equipment(No.2024LGSYS02),China.
文摘Low-heat Portland(LHP)cement is a new type of Portland cement that has been widely used in recent years due to its low heat of hydration,which makes it exceptional in temperature control for mass concrete construction.However,limited studies have investigated the impact of temperature and magnesium oxide(MgO)content on LHP cement-based materials.This study utilizes thermodynamic simulations to study the hydration process,pore structure,and autogenous shrinkage of LHP cement pastes with different water-to-cement ratios(0.3,0.4,and 0.5),curing temperatures(5,15,20,and 30℃),and MgO contents(mass fractions of 2%,4%,and 5%).Higher curing temperature is found to promote the hydration reactions in cement paste.Moreover,the incorporation of 4%MgO moderately decreases both porosity and dimensional shrinkage in pastes.The microstructural evolution of different LHP pastes is examined through a comparative analysis,lending insights into LHP cement-based material applications.
