Owing to the diversity of structure and potential applications in the field of electrics,sensors,and light-emitting diodes,lead halide perovskites have attracted great attention in recent years.Especially those lead h...Owing to the diversity of structure and potential applications in the field of electrics,sensors,and light-emitting diodes,lead halide perovskites have attracted great attention in recent years.Especially those lead halide perovskites with non-centrosymmetric crystal structures usually exhibit nonlinear optical(NLO) characteristics,which may endow them photoelectricity switching functionality.In this work,a lead-based hybrid organic-inorganic perovskite(HOIP) material,trimethyliodomethylammonium lead trichloride(TMIM·PbCl_(3)),is obtained on the basis of tetramethylammonium lead chloride through halogen substitution on the cation part.It shows dual-phase-transition behavior around 345 and 358 K, which is significantly improved.TMIM·PbCl_(3)crystallizes in the chiral space group,P2_(1)2_(1)2_(1), and shows a welldefined second harmonic generation(SHG) response,and good switching endurance,which makes it an excellent candidate for SHG switching material.This work highlights the importance of halogen substitution for crystal engineering and may pave way for the further exploration of the optoelectronic devices.展开更多
拟用一套以籼型恢复系IR24为背景亲本,渗入粳稻Asominori血缘的共有65个家系的染色体片段置换系(chromosome segment substitution(CSS)lines of IR24 as recipient parent and Asominori as donor parent,简称IAS群体)为父本,以荣丰A、...拟用一套以籼型恢复系IR24为背景亲本,渗入粳稻Asominori血缘的共有65个家系的染色体片段置换系(chromosome segment substitution(CSS)lines of IR24 as recipient parent and Asominori as donor parent,简称IAS群体)为父本,以荣丰A、中9A、1133A、1A 4个籼型不育系为母本,测定与产量相关的5个农艺性状的杂种优势。利用染色体片段置换系已有的分子标记图谱和QTLIci Mapping软件,采用逐步回归和极大似然估计相结合的方法,以LOD值≥2.0作为经验阈值来判断QTL是否存在来检测影响杂种优势的数量性状位点。研究结果表明,4套测交群体共检测到94个杂种优势位点,在所有检测到影响单株有效穗数,平均穗长,着粒密度,千粒质量等性状杂种优势位点中,分别位于第3,7和11染色体上的分子标记RM5474,RM336,RM287能够在4套测交群体中检测到,表现出一因多效现象,因此认为,QTL的一因多效可能也是杂种优势形成的遗传基础之一。展开更多
In this paper, a new hybrid model of amino acid substitution is developed and compared with the others in previous works. The results show that the new hybrid model can characterize the protein sequences very well by ...In this paper, a new hybrid model of amino acid substitution is developed and compared with the others in previous works. The results show that the new hybrid model can characterize the protein sequences very well by calculating Fisher weights, which can denote how much the variants contribute to the classification.展开更多
Phenylene-gallosilicates were prepared with the same crystalline structure as their aluminum analogues. The new Ga-Eni Carbon Silicates(Ga-ECS) phases were investigated by X-ray diffraction, scanning electron microsco...Phenylene-gallosilicates were prepared with the same crystalline structure as their aluminum analogues. The new Ga-Eni Carbon Silicates(Ga-ECS) phases were investigated by X-ray diffraction, scanning electron microscopy, nuclear magnetic resonance and thermogravimetric analysis, which demonstrated that gallium isomorphously replaced aluminum in the framework of the organic-inorganic hybrids similar to the case of classical zeolites. Hybrid ECS materials were obtained with different types of bridged silsesquioxane precursors that maintained the aluminum-silicate nature of the inorganic moiety. This work confirms a new level of crystal chemistry versatility for this class of materials, and demonstrates the possibility to tailor also the inorganic part of the framework by changing the nature of the trivalent heteroatom.展开更多
用1套以籼型恢复系IR24为背景亲本、渗入粳稻Asominori血缘的65个家系的染色体片段置换系[chromosome segment substitution(CSS)lines of IR24 as recipient parent and Asominori as donor parent,简称IAS群体]为父本,以赣香A、五丰A...用1套以籼型恢复系IR24为背景亲本、渗入粳稻Asominori血缘的65个家系的染色体片段置换系[chromosome segment substitution(CSS)lines of IR24 as recipient parent and Asominori as donor parent,简称IAS群体]为父本,以赣香A、五丰A两个籼型不育系为母本配制杂交组合,测定了两个群体与产量相关的5个性状的杂种优势。利用染色体片段置换系已有的分子标记图谱和QTLIciMapping软件,采用逐步回归和极大似然估计相结合的方法,以LOD值≥2.0作为经验阈值来判断QTL是否存在来检测影响杂种优势的数量性状位点。研究结果表明,在两套测交群体中共检测到100个杂种优(劣)势位点;在所有检测到的影响单株有效穗数、平均穗长、着粒密度、千粒重等性状的杂种优(劣)势位点中,分别位于第3、7和11染色体上的与杂种优势紧密连锁的分子标记RM5474、RM336、RM287能够在两套测交群体中检测到;还有其它一些微效QTL位点也表现出一因多效现象。展开更多
基金supported by the National Natural Science Foundation of China (No. 21901099)。
文摘Owing to the diversity of structure and potential applications in the field of electrics,sensors,and light-emitting diodes,lead halide perovskites have attracted great attention in recent years.Especially those lead halide perovskites with non-centrosymmetric crystal structures usually exhibit nonlinear optical(NLO) characteristics,which may endow them photoelectricity switching functionality.In this work,a lead-based hybrid organic-inorganic perovskite(HOIP) material,trimethyliodomethylammonium lead trichloride(TMIM·PbCl_(3)),is obtained on the basis of tetramethylammonium lead chloride through halogen substitution on the cation part.It shows dual-phase-transition behavior around 345 and 358 K, which is significantly improved.TMIM·PbCl_(3)crystallizes in the chiral space group,P2_(1)2_(1)2_(1), and shows a welldefined second harmonic generation(SHG) response,and good switching endurance,which makes it an excellent candidate for SHG switching material.This work highlights the importance of halogen substitution for crystal engineering and may pave way for the further exploration of the optoelectronic devices.
文摘拟用一套以籼型恢复系IR24为背景亲本,渗入粳稻Asominori血缘的共有65个家系的染色体片段置换系(chromosome segment substitution(CSS)lines of IR24 as recipient parent and Asominori as donor parent,简称IAS群体)为父本,以荣丰A、中9A、1133A、1A 4个籼型不育系为母本,测定与产量相关的5个农艺性状的杂种优势。利用染色体片段置换系已有的分子标记图谱和QTLIci Mapping软件,采用逐步回归和极大似然估计相结合的方法,以LOD值≥2.0作为经验阈值来判断QTL是否存在来检测影响杂种优势的数量性状位点。研究结果表明,4套测交群体共检测到94个杂种优势位点,在所有检测到影响单株有效穗数,平均穗长,着粒密度,千粒质量等性状杂种优势位点中,分别位于第3,7和11染色体上的分子标记RM5474,RM336,RM287能够在4套测交群体中检测到,表现出一因多效现象,因此认为,QTL的一因多效可能也是杂种优势形成的遗传基础之一。
基金supported by the National Natural Science Foundation of China(No 29877016).
文摘In this paper, a new hybrid model of amino acid substitution is developed and compared with the others in previous works. The results show that the new hybrid model can characterize the protein sequences very well by calculating Fisher weights, which can denote how much the variants contribute to the classification.
文摘Phenylene-gallosilicates were prepared with the same crystalline structure as their aluminum analogues. The new Ga-Eni Carbon Silicates(Ga-ECS) phases were investigated by X-ray diffraction, scanning electron microscopy, nuclear magnetic resonance and thermogravimetric analysis, which demonstrated that gallium isomorphously replaced aluminum in the framework of the organic-inorganic hybrids similar to the case of classical zeolites. Hybrid ECS materials were obtained with different types of bridged silsesquioxane precursors that maintained the aluminum-silicate nature of the inorganic moiety. This work confirms a new level of crystal chemistry versatility for this class of materials, and demonstrates the possibility to tailor also the inorganic part of the framework by changing the nature of the trivalent heteroatom.
文摘用1套以籼型恢复系IR24为背景亲本、渗入粳稻Asominori血缘的65个家系的染色体片段置换系[chromosome segment substitution(CSS)lines of IR24 as recipient parent and Asominori as donor parent,简称IAS群体]为父本,以赣香A、五丰A两个籼型不育系为母本配制杂交组合,测定了两个群体与产量相关的5个性状的杂种优势。利用染色体片段置换系已有的分子标记图谱和QTLIciMapping软件,采用逐步回归和极大似然估计相结合的方法,以LOD值≥2.0作为经验阈值来判断QTL是否存在来检测影响杂种优势的数量性状位点。研究结果表明,在两套测交群体中共检测到100个杂种优(劣)势位点;在所有检测到的影响单株有效穗数、平均穗长、着粒密度、千粒重等性状的杂种优(劣)势位点中,分别位于第3、7和11染色体上的与杂种优势紧密连锁的分子标记RM5474、RM336、RM287能够在两套测交群体中检测到;还有其它一些微效QTL位点也表现出一因多效现象。
