以人教版义务教育教科书《化学》与美国《科学探索者--化学反应》中的“物质构成”为例,从科学史、科学哲学与科学社会学的视角,在科学史,科学哲学与科学社会史(History of Science and Philosophy of Science,HPS)的内容数量、构成以...以人教版义务教育教科书《化学》与美国《科学探索者--化学反应》中的“物质构成”为例,从科学史、科学哲学与科学社会学的视角,在科学史,科学哲学与科学社会史(History of Science and Philosophy of Science,HPS)的内容数量、构成以及呈现方式等方面进行统计与分析。在内容方面,选取“原子构成”进行详细的比较,客观地反映两国初中化学教材融入HPS教育的现状,并提出相应建议,以期为今后的HPS化学教育提供参考。展开更多
The chemical composition and biological activity of Sanghuangporus vaninii solid culture treated by static magnetic field were studied.The compounds were isolated and purified using ultrasonic extraction and semi-prep...The chemical composition and biological activity of Sanghuangporus vaninii solid culture treated by static magnetic field were studied.The compounds were isolated and purified using ultrasonic extraction and semi-preparative liquid chromatography.Their structures were identified through spectral data,and the inhibitory activities againstα-amylase,α-glucosidase and pancreatic lipase were evaluated.Three compounds,5,7-dihydroxy-3,4'-dimethoxyflavone(1),D-(+)-Trehalose(2),pinolenic acid(3),were extracted from the petroleum ether layer.Comparison of peak heights indicated a significantly higher content of compounds subjected to a 4 mT static magnetic field compared to those untreated.Activity tests revealed that compounds 1 and 2 exhibited strong anti-α-amylase and anti-α-glucosidase activities.Specifically,compound 1 had inhibition rates of(65.37±0.05)%and(73.81±0.12)%after 4 mT treatment,compared to(57.26±0.11)%and(65.33±0.14)%without.Compound 2 showed inhibition rates of(68.61±0.12)%and(65.38±0.09)%with the magnetic field,versus(60.71±0.06)%and(56.18±0.02)%without.Compound 3 displayed a notable inhibitory effect on pancreatic lipase,with rates of(60.83±0.03)%after 4 mT treatment and(53.77±0.09)%without.This study demonstrates that the static magnetic field enhances the chemical content and bioactivity of Sanghuangporus vaninii solid culture,providing a basis for its further development and application.展开更多
文摘以人教版义务教育教科书《化学》与美国《科学探索者--化学反应》中的“物质构成”为例,从科学史、科学哲学与科学社会学的视角,在科学史,科学哲学与科学社会史(History of Science and Philosophy of Science,HPS)的内容数量、构成以及呈现方式等方面进行统计与分析。在内容方面,选取“原子构成”进行详细的比较,客观地反映两国初中化学教材融入HPS教育的现状,并提出相应建议,以期为今后的HPS化学教育提供参考。
基金supported by the Natural Science Foundation of Jilin Province(20220402050 GH,JJKH20220826KJ)Natural Science Foundation of Changchun Normal University(2020004).
文摘The chemical composition and biological activity of Sanghuangporus vaninii solid culture treated by static magnetic field were studied.The compounds were isolated and purified using ultrasonic extraction and semi-preparative liquid chromatography.Their structures were identified through spectral data,and the inhibitory activities againstα-amylase,α-glucosidase and pancreatic lipase were evaluated.Three compounds,5,7-dihydroxy-3,4'-dimethoxyflavone(1),D-(+)-Trehalose(2),pinolenic acid(3),were extracted from the petroleum ether layer.Comparison of peak heights indicated a significantly higher content of compounds subjected to a 4 mT static magnetic field compared to those untreated.Activity tests revealed that compounds 1 and 2 exhibited strong anti-α-amylase and anti-α-glucosidase activities.Specifically,compound 1 had inhibition rates of(65.37±0.05)%and(73.81±0.12)%after 4 mT treatment,compared to(57.26±0.11)%and(65.33±0.14)%without.Compound 2 showed inhibition rates of(68.61±0.12)%and(65.38±0.09)%with the magnetic field,versus(60.71±0.06)%and(56.18±0.02)%without.Compound 3 displayed a notable inhibitory effect on pancreatic lipase,with rates of(60.83±0.03)%after 4 mT treatment and(53.77±0.09)%without.This study demonstrates that the static magnetic field enhances the chemical content and bioactivity of Sanghuangporus vaninii solid culture,providing a basis for its further development and application.
