Developing green and efficient methods to acquire lignocellulose-based chemicals with high added value is beneficial for facilitating green chemistry and sustainable development.The goal of this study is to demonstrat...Developing green and efficient methods to acquire lignocellulose-based chemicals with high added value is beneficial for facilitating green chemistry and sustainable development.The goal of this study is to demonstrate that bio-based benzaldehyde,a noteworthy high-value chemical,is able to be directionally prepared from lignocellulosic biomass.This new control-lable transformation was materialized by uniting catalytic-pyrolysis of lignocellulose to toluene intermediate and catalytic oxidation of toluene intermediate to bio-based benzalde-hyde.This work also developed a highly active magnetic catalyst(CoFe_(2)O_(4)@Biochar(HTR)),achieving 77.1%benzaldehyde selectivity and 46.7%benzaldehyde yield using this catalyst.It was found that introducing the biochar carrier into the cobalt iron composite metal oxide cat-alyst enhanced hydroxyl radical formation and bio-based benzaldehyde synthesis.Based on catalyst characterizations and hydroxyl radical analysis,potential reaction mechanism for bio-based benzaldehyde synthesis was proposed.This strategy may provide a beneficial pathway for developing high-value bio-based chemical(benzaldehyde)using renewable lignocellulosic biomass.展开更多
目的 :探讨端粒酶基因 h TRT和 h TR在胃癌组织中的表达及其意义。方法 :用原位杂交技术检测 48例胃癌组织、1 0例正常胃粘膜组织中端粒酶基因的表达。结果 :48例胃癌组织中 h TRT和 h TR阳性表达分别为 79.2 %和 85 .4% ;1 0例正常胃...目的 :探讨端粒酶基因 h TRT和 h TR在胃癌组织中的表达及其意义。方法 :用原位杂交技术检测 48例胃癌组织、1 0例正常胃粘膜组织中端粒酶基因的表达。结果 :48例胃癌组织中 h TRT和 h TR阳性表达分别为 79.2 %和 85 .4% ;1 0例正常胃粘膜组织中除1例 h TR弱阳性表达外均为阴性表达 ,胃癌组织与正常胃粘膜组织中 h TRT、h TR的表达均有显著性差异。结论 :端粒酶基因 h TRT和 h TR在胃癌中均为高表达 ,且 h TRT和 h TR有相关性 。展开更多
基金supported by the National Natural Sci-ence Foundation of China(Nos.U21A20288 and 21978280).
文摘Developing green and efficient methods to acquire lignocellulose-based chemicals with high added value is beneficial for facilitating green chemistry and sustainable development.The goal of this study is to demonstrate that bio-based benzaldehyde,a noteworthy high-value chemical,is able to be directionally prepared from lignocellulosic biomass.This new control-lable transformation was materialized by uniting catalytic-pyrolysis of lignocellulose to toluene intermediate and catalytic oxidation of toluene intermediate to bio-based benzalde-hyde.This work also developed a highly active magnetic catalyst(CoFe_(2)O_(4)@Biochar(HTR)),achieving 77.1%benzaldehyde selectivity and 46.7%benzaldehyde yield using this catalyst.It was found that introducing the biochar carrier into the cobalt iron composite metal oxide cat-alyst enhanced hydroxyl radical formation and bio-based benzaldehyde synthesis.Based on catalyst characterizations and hydroxyl radical analysis,potential reaction mechanism for bio-based benzaldehyde synthesis was proposed.This strategy may provide a beneficial pathway for developing high-value bio-based chemical(benzaldehyde)using renewable lignocellulosic biomass.
文摘目的 :探讨端粒酶基因 h TRT和 h TR在胃癌组织中的表达及其意义。方法 :用原位杂交技术检测 48例胃癌组织、1 0例正常胃粘膜组织中端粒酶基因的表达。结果 :48例胃癌组织中 h TRT和 h TR阳性表达分别为 79.2 %和 85 .4% ;1 0例正常胃粘膜组织中除1例 h TR弱阳性表达外均为阴性表达 ,胃癌组织与正常胃粘膜组织中 h TRT、h TR的表达均有显著性差异。结论 :端粒酶基因 h TRT和 h TR在胃癌中均为高表达 ,且 h TRT和 h TR有相关性 。
