The synthesis of 1,3,5-substituted-1,2,4-triazoles from α-imino-3-pyridine formic acid,acetamidine and anisole hydrazine as a model reaction in this paper and the synthesis mechanism of 1,3,5-substituted-1,2,4-triazo...The synthesis of 1,3,5-substituted-1,2,4-triazoles from α-imino-3-pyridine formic acid,acetamidine and anisole hydrazine as a model reaction in this paper and the synthesis mechanism of 1,3,5-substituted-1,2,4-triazole compounds from carboxylic acids,amidines and hydrazines have been first investigated with the B3 LYP/6-311＋＋G＊＊ method.According to the potential energy profile,it can be predicted that the course of the reaction consists of five reactions containing six elementary reactions.The α-imino-3-pyridine formic acid and acetamidine form first an intermediate product through a dehydration reaction; the intermediate product further combines with hydrogen ion to form a positive ion; the positive ion reacts with anisole hydrazine by a dehydration reaction to form another positive ion; then,followed by two isomerization reactions,the final reaction with the acetate ion（Ac-） produces the final product.The research results reveal the laws of synthesis reaction of 1,3,5-substituted-1,2,4-triazoles by the carboxylic acids,amidines,hydrazines and their derivatives on theoretical level.It provides the systemic theoretical basis for the synthesis,development and application of 1,3,5-substituted-1,2,4-triazole compounds.展开更多
细胞许多新陈代谢活动都伴随着离子浓度的改变,通过对离子浓度的检测可以间接检测细胞代谢状态。荧光共振能量转移技术(fluorescence resonance energy transfer,FRET)可以实现在活细胞内对离子浓度微弱变化的动态检测,为细胞离子代谢...细胞许多新陈代谢活动都伴随着离子浓度的改变,通过对离子浓度的检测可以间接检测细胞代谢状态。荧光共振能量转移技术(fluorescence resonance energy transfer,FRET)可以实现在活细胞内对离子浓度微弱变化的动态检测,为细胞离子代谢的可视化检测提供了有力工具。本文综述了FRET技术在离子浓度、离子通道以及膜电位检测方面的应用。展开更多
基金supported by the National Natural Science Foundation of China(No.51102114)
文摘The synthesis of 1,3,5-substituted-1,2,4-triazoles from α-imino-3-pyridine formic acid,acetamidine and anisole hydrazine as a model reaction in this paper and the synthesis mechanism of 1,3,5-substituted-1,2,4-triazole compounds from carboxylic acids,amidines and hydrazines have been first investigated with the B3 LYP/6-311＋＋G＊＊ method.According to the potential energy profile,it can be predicted that the course of the reaction consists of five reactions containing six elementary reactions.The α-imino-3-pyridine formic acid and acetamidine form first an intermediate product through a dehydration reaction; the intermediate product further combines with hydrogen ion to form a positive ion; the positive ion reacts with anisole hydrazine by a dehydration reaction to form another positive ion; then,followed by two isomerization reactions,the final reaction with the acetate ion（Ac-） produces the final product.The research results reveal the laws of synthesis reaction of 1,3,5-substituted-1,2,4-triazoles by the carboxylic acids,amidines,hydrazines and their derivatives on theoretical level.It provides the systemic theoretical basis for the synthesis,development and application of 1,3,5-substituted-1,2,4-triazole compounds.
文摘细胞许多新陈代谢活动都伴随着离子浓度的改变,通过对离子浓度的检测可以间接检测细胞代谢状态。荧光共振能量转移技术(fluorescence resonance energy transfer,FRET)可以实现在活细胞内对离子浓度微弱变化的动态检测,为细胞离子代谢的可视化检测提供了有力工具。本文综述了FRET技术在离子浓度、离子通道以及膜电位检测方面的应用。
