Beryllium-containing sludge(BCS)is a typical hazardous waste from Be smelting,which can cause serious harm to ecology and human health by releasing harmful Be if it is stored long-term in environment.Nonetheless,the o...Beryllium-containing sludge(BCS)is a typical hazardous waste from Be smelting,which can cause serious harm to ecology and human health by releasing harmful Be if it is stored long-term in environment.Nonetheless,the occurrence of Be in BCS is unclear,which seriously hinders the development of pollution control technologies.In order to enhance the understanding of BCS,the occurrence of Be and the microscale interactions with coexisting phases were investigated for the first time.It was found that CaSO_(4)·2H_(2)O and amorphous SiO_(2) are the primary phases of BCS.The simulated experiments of purified materials showed that Be interacted with CaSO_(4)·2H_(2)O and amorphous SiO_(2).Be can enter into the lattice of CaSO_(4)·2H_(2)O mainly as free Be2+.Amorphous SiO_(2) can adsorb Be2+particularly at a pH range of 3–5.The dissolution behavior experiment of BCS shows that about 52%of the Be is readily extracted under acidic conditions,which refers to the Be of independent occurrence.In contrast,the remaining 48%of Be can be extracted only after the CaSO_(4)·2H_(2)O has completely dissolved.Hence,CaSO_(4)·2H_(2)O is identified as the key occurrence phase which determines the highly efficient dissolution of Be.As a result,this study enhances the understanding of BCS and lays the foundation for the development of Be separation technologies.展开更多
非特异性脂质转移蛋白(non-specific lipid transfer protein,nsLTPs)广泛存在于植物界中,参与许多关键的生物学过程,如花粉的发育、种子发育及细胞壁的延伸等。OsLTPL166基因编码区长度是465 bp,其编码的蛋白质由154个氨基酸组成;根据...非特异性脂质转移蛋白(non-specific lipid transfer protein,nsLTPs)广泛存在于植物界中,参与许多关键的生物学过程,如花粉的发育、种子发育及细胞壁的延伸等。OsLTPL166基因编码区长度是465 bp,其编码的蛋白质由154个氨基酸组成;根据跨膜结构域及信号肽预测,OsLTPL166在13~35氨基酸处含有跨膜结构域,N端存在一个32个氨基酸残基的信号肽,切割位点位于氨基酸残基32和33之间,产生具有122个氨基酸残基的成熟蛋白质。组织表达分析发现,OsLTPL166仅在种子中特异性表达,且种子发育后期表达量较高。为了研究水稻Os LTPL166在种子发育中的功能,本研究以‘浙辐粳83’为遗传背景构建了敲除载体,利用CRISPR/Cas9技术对OsLTPL166进行定点编辑,共获得24个独立的转基因株系,其中纯合突变株系有7株,编辑方式主要为碱基的插入和缺失,导致氨基酸序列发生移码,成功获得OsLTPL166功能缺陷型突变体。本研究为进一步探究该基因在种子发育进程中的生物学功能提供了遗传材料。展开更多
基金supported by the National Natural Science Foundation of China(No.22276219)the foundation for Innovative Research Groups of the National Natural Science Foundation of China(No.52121004)+1 种基金the major program Natural Science Foundation of Hunan Province of China(No.2021JC0001)the Fundamental Research Funds for the Central Universities of Central South University(No.2024ZZTS0063).
文摘Beryllium-containing sludge(BCS)is a typical hazardous waste from Be smelting,which can cause serious harm to ecology and human health by releasing harmful Be if it is stored long-term in environment.Nonetheless,the occurrence of Be in BCS is unclear,which seriously hinders the development of pollution control technologies.In order to enhance the understanding of BCS,the occurrence of Be and the microscale interactions with coexisting phases were investigated for the first time.It was found that CaSO_(4)·2H_(2)O and amorphous SiO_(2) are the primary phases of BCS.The simulated experiments of purified materials showed that Be interacted with CaSO_(4)·2H_(2)O and amorphous SiO_(2).Be can enter into the lattice of CaSO_(4)·2H_(2)O mainly as free Be2+.Amorphous SiO_(2) can adsorb Be2+particularly at a pH range of 3–5.The dissolution behavior experiment of BCS shows that about 52%of the Be is readily extracted under acidic conditions,which refers to the Be of independent occurrence.In contrast,the remaining 48%of Be can be extracted only after the CaSO_(4)·2H_(2)O has completely dissolved.Hence,CaSO_(4)·2H_(2)O is identified as the key occurrence phase which determines the highly efficient dissolution of Be.As a result,this study enhances the understanding of BCS and lays the foundation for the development of Be separation technologies.
