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Molecular mechanism for the unusual enhancement of the second-step chemiluminescence production from the carcinogenic tetrabromohydroquinone and H2O_(2)
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作者 Zi-Han Wang chun-hua huang +2 位作者 Zhi-Sheng Liu Li Mao Ben-Zhan Zhu 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2024年第7期330-342,共13页
We have found recently that two-step intrinsic hydroxyl radical(·OH)-dependent chemiluminescence(CL)could be produced by carcinogenic tetrahaloquinone and H_(2)O_(2).However,the first-step CL was too fast to clea... We have found recently that two-step intrinsic hydroxyl radical(·OH)-dependent chemiluminescence(CL)could be produced by carcinogenic tetrahaloquinone and H_(2)O_(2).However,the first-step CL was too fast to clearly detect the stepwise generation of·OH and CL,and to distinguish the exact dividing point between the first-step and second-step CL.Here we found that,extremely clear two-step intrinsic CL could be produced by the relative slow reaction of tetrabromohydroquinone(TBHQ)with H_(2)O_(2),which was directly dependent on the two-step·OH generation.Interestingly,the second-step,but not the first-step CL production of TBHQ/H_(2)O_(2)(CRET donor)was markedly enhanced by fluorescein(a typical xanthene dye,CRET acceptor)through a unique chemiluminescence resonance energy transfer(CRET)process.The novel CRET system of TBHQ/H_(2)O_(2)/fluorescein was successfully applied for the sensitive detection of TBHQ with the detection limit as low as 2.5μmol/L.These findings will help to develop more sensitive and highly efficient CL or CRET systems and specific CL sensor to detect the carcinogenic haloquinones,which may have broad environmental applications. 展开更多
关键词 Two-step chemiluminescence Bromohydroquinone Hydrogen peroxide Hydroxyl radical CRET
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醛肟类神经性毒剂防治药物的新型解毒分子作用机制 被引量:1
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作者 任福荣 肖璇 +4 位作者 谢琳娜 徐丹 邵杰 黄春华 朱本占 《中国科学:化学》 CAS CSCD 北大核心 2018年第10期1247-1259,共13页
吡啶盐醛肟类药物是一类常见的有机磷类神经性毒剂和农药的解毒剂.卤代苯醌是一类致癌性的活性中间体,最近在饮用水消毒副产物中也被检出.我们发现, 2-吡啶盐醛肟类代表性药物如解磷定可快速促进四氯-1,4-苯醌通过连续两步的脱氯水解反... 吡啶盐醛肟类药物是一类常见的有机磷类神经性毒剂和农药的解毒剂.卤代苯醌是一类致癌性的活性中间体,最近在饮用水消毒副产物中也被检出.我们发现, 2-吡啶盐醛肟类代表性药物如解磷定可快速促进四氯-1,4-苯醌通过连续两步的脱氯水解反应转化为2,5-二氯-3,6-二羟基-1,4-苯醌,比其自然水解的速率提高了18万倍.然而,当解磷定中的氮羟基被掩蔽后则不能促进四氯-1,4-苯醌水解.通过联合运用多种分离和分析鉴定方法发现,解磷定最终转化为其相应的腈类化合物.采用^(18)O-H_2O标记等实验,最终确定2-吡啶盐醛肟类药物对四卤苯醌类致癌物的解毒机理是通过亲核取代同时伴随两次Beckmann裂解反应.本文介绍了这类可在正常生理条件下发生的连续两步Beckmann裂解反应,以期对将来研究这两类具有重要生物学和环境学意义的醛肟类药物及多卤代醌类环境致癌物具有指导作用. 展开更多
关键词 Beckmann裂解反应 吡啶盐醛肟 神经性毒剂防治药物 四氯-1 4-苯醌 解毒机理
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Network meta-analysis on different acupuncture therapies for post-stroke spastic hemiplegia 被引量:9
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作者 Rui-qi WANG chun-hua huang Qing-zhong WU 《World Journal of Acupuncture-Moxibustion》 CSCD 2022年第1期78-84,共7页
Objective:To perform a network meta-analysis on four commonly used acupuncture therapies(electroacupuncture,fire acupuncture,warm acupuncture,and filiform needling) and rehabilitation therapy in the treatment of post-... Objective:To perform a network meta-analysis on four commonly used acupuncture therapies(electroacupuncture,fire acupuncture,warm acupuncture,and filiform needling) and rehabilitation therapy in the treatment of post-stroke spastic hemiplegia so as to compare the differences in clinical therapeutic effect between acupuncture therapy and rehabilitation therapy as well as among different therapeutic methods of acupuncture.Methods:A computer-based retrieval was conducted in Chinese and English databases,i.e.CNKI,WanFang,VIP,SinoMed,PubMed,Embase,Web of Science and Cochrane library.The search period limit was from the database establishment to April 17,2020.Data analysis was performed through Revman 5.3,Gemtc 0.14.3 and Stata 14.2.Results:A total of 27 trials were finally eligible,including 1880 patients,943 patients of which were in observation group and 937 patients in control group.In terms of the improvement of effective rate,electroacupuncture,fire needling,warm acupuncture and filiform needling methods were all better than rehabilitation therapy,and among which,warm acupuncture was the highest in probability to be the optimal measure.Regarding the improvement in Fugl-Meyer Assessment(FMA) motor function score,fire needling,warm acupuncture and filiform needling methods were all better than rehabilitation therapy,and among which,fire needling method was the highest in probability to be the optimal measure.In view of the improvement of BI score,fire needling method was better than electroacupuncture and filiform needling method,while,warm acupuncture was better than electroacupuncture,thus,fire needling method may be the optimal measure.For the modified Ashworth muscular tension assessment,there was no significant differences in pairwise comparison among different interventions and warm acupuncture was probably the optimal measure.Conclusion:The overall therapeutic effect of 4 acupuncture therapies is better than rehabilitation therapy on post-stroke spastic hemiplegia,respectively,among which,the therapeutic effect of warm acupuncture and fire needling method is the best.However,because of a limitation of the varieties of acupuncturemoxibustion therapy and the number of included trials,it needs to conduct more rigorous and scientific randomized controlled trials so that this conclusion can be further confirmed. 展开更多
关键词 Spastic hemiplegia POST-STROKE ACUPUNCTURE-MOXIBUSTION Network meta-analysis
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