A supramolecular hydrogel （defined as G1） formed from 1,2,4,5-benzene tetracarboxylic acid （BTCA） and 2-amino-3- hydroxypyridine possessed higher Tgel than that of another hydrogel （defined as G2） formed from BT...A supramolecular hydrogel （defined as G1） formed from 1,2,4,5-benzene tetracarboxylic acid （BTCA） and 2-amino-3- hydroxypyridine possessed higher Tgel than that of another hydrogel （defined as G2） formed from BTCA and 3-hydroxypyridine. Based on the analysis of their xerogels by 1H NMR, IR and XRD, the higher stability of G1 was attributed to the formation of stronger hydrogen binding enhanced by the ortho amino group of 2-amino-3-hydroxypyridine.展开更多
Seven organophosphoric acid triesters （OPEs） and eight polycyclic aromatic hydrocarbons （PAHs） in black cicadas were measured to determine the concentration levels and to investigate how the cicadas are affected b...Seven organophosphoric acid triesters （OPEs） and eight polycyclic aromatic hydrocarbons （PAHs） in black cicadas were measured to determine the concentration levels and to investigate how the cicadas are affected by soil contamination. Adult cicadas, nymphal exoskeletons, and soils were sampled in Higashi Osaka, Japan. Four OPEs and six PAHs were detected in the adult cicadas. The total concentrations of OPEs and PAHs ranged from 27.2 ng/g to 824 ng/g and from 4.30 ng/g to 270 ng/g, respectively. Four OPEs and five PAHs were detected in the nymphal exoskeletons. The total concentrations of OPEs and PAHs ranged from 184 ng/g to 1830 ng/g and from 40.3 ng/g to 970 ng/g, respectively. In the soils, three OPEs and six PAHs were detected at the same concentration levels as those detected in the adult cicadas. Significant correlations were observed in the micropollutant concentrations between soils and adult cicadas, and between soils and nymphal exoskeletons. This trend indicates that black cicadas accumulate OPEs and PAHs from contaminated soils.展开更多
文摘A supramolecular hydrogel （defined as G1） formed from 1,2,4,5-benzene tetracarboxylic acid （BTCA） and 2-amino-3- hydroxypyridine possessed higher Tgel than that of another hydrogel （defined as G2） formed from BTCA and 3-hydroxypyridine. Based on the analysis of their xerogels by 1H NMR, IR and XRD, the higher stability of G1 was attributed to the formation of stronger hydrogen binding enhanced by the ortho amino group of 2-amino-3-hydroxypyridine.
文摘Seven organophosphoric acid triesters （OPEs） and eight polycyclic aromatic hydrocarbons （PAHs） in black cicadas were measured to determine the concentration levels and to investigate how the cicadas are affected by soil contamination. Adult cicadas, nymphal exoskeletons, and soils were sampled in Higashi Osaka, Japan. Four OPEs and six PAHs were detected in the adult cicadas. The total concentrations of OPEs and PAHs ranged from 27.2 ng/g to 824 ng/g and from 4.30 ng/g to 270 ng/g, respectively. Four OPEs and five PAHs were detected in the nymphal exoskeletons. The total concentrations of OPEs and PAHs ranged from 184 ng/g to 1830 ng/g and from 40.3 ng/g to 970 ng/g, respectively. In the soils, three OPEs and six PAHs were detected at the same concentration levels as those detected in the adult cicadas. Significant correlations were observed in the micropollutant concentrations between soils and adult cicadas, and between soils and nymphal exoskeletons. This trend indicates that black cicadas accumulate OPEs and PAHs from contaminated soils.
