采用电感耦合等离子体质谱法(Inductively Coupled Plasma Mass Spectrometry,ICP-MS)测定了漳州市碱面及其原料(面粉、水、碱和盐)的硼含量,为碱面质量安全监测提供本底判断依据。结果表明,总计381份面粉、水、大树碱、盐和碱面样品均...采用电感耦合等离子体质谱法(Inductively Coupled Plasma Mass Spectrometry,ICP-MS)测定了漳州市碱面及其原料(面粉、水、碱和盐)的硼含量,为碱面质量安全监测提供本底判断依据。结果表明,总计381份面粉、水、大树碱、盐和碱面样品均检出了硼,最终碱面的硼本底值在0.02~0.732mg/kg之间,平均值为0.300mg/kg,呈正态分布。95%概率条件下的置信区间为0.250~0.349mg/kg,置信区间最大值为0.349mg/kg,该数值可作为漳州地区碱面的硼元素本底值参考。展开更多
Clustered regularly interspaced short palindromic repeat(CRISPR)technologies have opened new scientific avenues widely used in biomedical research.But simple and efficient strategies to reversibly control CRISPR are l...Clustered regularly interspaced short palindromic repeat(CRISPR)technologies have opened new scientific avenues widely used in biomedical research.But simple and efficient strategies to reversibly control CRISPR are lacking.In contrast to previous methods of attaching molecules to the ribose of guide RNAs(gRNAs),we focused on molecules that can directly react with nucleobases.Here,we developed a new strategy to switch off the CRISPR system by efficiently installing 4-(bromomethyl)phenylboronic acid onto nucleobases in gRNAs.CRISPR can then be activated by hydrogen peroxide(H_(2)O_(2)).Collectively,this work demonstrates boronic acid reversibly modulating CRISPR systems through a H_(2)O_(2)-responsive manner.展开更多
文摘采用电感耦合等离子体质谱法(Inductively Coupled Plasma Mass Spectrometry,ICP-MS)测定了漳州市碱面及其原料(面粉、水、碱和盐)的硼含量,为碱面质量安全监测提供本底判断依据。结果表明,总计381份面粉、水、大树碱、盐和碱面样品均检出了硼,最终碱面的硼本底值在0.02~0.732mg/kg之间,平均值为0.300mg/kg,呈正态分布。95%概率条件下的置信区间为0.250~0.349mg/kg,置信区间最大值为0.349mg/kg,该数值可作为漳州地区碱面的硼元素本底值参考。
基金the National Natural Science Foundation of China(grant nos.22177089,91853119,21721005,91753201,21877086,and 22177088)the Hubei Natural Science Foundation for Distinguished Young Scholars(grant no.2019CFA064)the Fundamental Research Funds for the Central Universities(grant no.2042019-kf0189).
文摘Clustered regularly interspaced short palindromic repeat(CRISPR)technologies have opened new scientific avenues widely used in biomedical research.But simple and efficient strategies to reversibly control CRISPR are lacking.In contrast to previous methods of attaching molecules to the ribose of guide RNAs(gRNAs),we focused on molecules that can directly react with nucleobases.Here,we developed a new strategy to switch off the CRISPR system by efficiently installing 4-(bromomethyl)phenylboronic acid onto nucleobases in gRNAs.CRISPR can then be activated by hydrogen peroxide(H_(2)O_(2)).Collectively,this work demonstrates boronic acid reversibly modulating CRISPR systems through a H_(2)O_(2)-responsive manner.
