背景:不同于非炎症性细胞凋亡,细胞焦亡是炎症性细胞死亡的一种形式,它伴随着膜完整性的破坏和促炎性细胞内物质的释放,因而与多种疾病有关。沉默信息调节因子家族是依赖于烟酰胺腺嘌呤二核苷酸的组蛋白去乙酰化酶家族。除了去乙酰化外...背景:不同于非炎症性细胞凋亡,细胞焦亡是炎症性细胞死亡的一种形式,它伴随着膜完整性的破坏和促炎性细胞内物质的释放,因而与多种疾病有关。沉默信息调节因子家族是依赖于烟酰胺腺嘌呤二核苷酸的组蛋白去乙酰化酶家族。除了去乙酰化外,还具有其他酶活性,如脱琥珀酸化、脱丙酰化和腺苷二磷酸-核糖基化等,在参与细胞焦亡调控中发挥重要的作用。目的:综述沉默信息调节因子家族在细胞焦亡中的作用及影响。方法:第一作者通过检索PubMed、Web of Science、中国知网、万方数据库,检索时限为各数据库建库至2024年3月,中文检索词为“沉默信息调节因子,沉默信息调节因子1,沉默信息调节因子2,沉默信息调节因子3,沉默信息调节因子4,沉默信息调节因子5,沉默信息调节因子6,沉默信息调节因子7,细胞焦亡”,英文检索词为“Sirtuins,Sirtuin1,Sirtuin2,Sirtuin3,Sirtuin4,Sirtuin5,Sirtuin6,Sirtuin7,pyroptosis”,最后纳入71篇文献进行综述。结果与结论:①沉默信息调节因子家族均参与了对细胞焦亡的调控;②过表达沉默信息调节因子1、沉默信息调节因子4可通过多种通路抑制细胞焦亡,从而缓解细胞焦亡对机体的损害;③沉默信息调节因子3除了影响细胞焦亡经典通路外,还能通过增强线粒体活性氧的清除能力、有丝分裂来抑制细胞焦亡;④沉默信息调节因子5参与细胞内代谢和能量平衡的调节,包括能量的摄入、储存和消耗;⑤沉默信息调节因子6既能通过多种通路影响细胞焦亡,还能影响巨噬细胞M1极化、活性氧的生成以及细胞焦亡相关因子消皮素D的裂解以抑制细胞焦亡;⑥过表达沉默信息调节因子7可抑制细胞焦亡;⑦沉默信息调节因子2与其他家族成员不同,其被敲降后才可抑制细胞焦亡,但报道较少,需要更为深入与全面的研究。展开更多
In this paper, an experimental study was conducted in order to test the feasibility of sintering mullite directly from the high-alumina fly ash, without adding any extra material. The results show that the mullite con...In this paper, an experimental study was conducted in order to test the feasibility of sintering mullite directly from the high-alumina fly ash, without adding any extra material. The results show that the mullite contents in most sintered samples are over 70%. The samples sintered from the beneficiated fly ash have a higher content of mullite than those from the as-received fly ash under the same synthetic conditions. To obtain an equal amount of mullite, a higher sintering temperature is needed for the beneficiated fly ash than for the as-received fly ash. Considering the physical properties of sintered mullite, the favorable sintering temperature is 1400℃ for the as-received fly ash and 1500℃ for the beneficiated fly ash. A higher sintering temperature and a shorter holding time are profitable to sintering mullite. The orthogonal test confirmed that the dominant factor affecting mullite synthesis is sintering temperature, and that the most profitable matching conditions are 200 MPa-1500℃-3 h for the as-received fly ash and 200 MPa-1500 ℃-4 h for the beneficiated fly ash.展开更多
文摘依托数学模型和情景模拟,形成弹性的土地利用优化配置方案,对促进生态脆弱农区生态、农业和经济用地协调发展具有重要意义。以河套灌区乌兰布和灌域为例,采用MSPA(morphological spatial pattern analysis)和斑块重要性指数识别和提取生态源地,耦合NSGA-Ⅲ(non-dominated sorting genetic algorithmⅢ)和FLUS(future land use simulation)模型,基于4种情景模拟形成具有弹性的生态脆弱农区土地利用优化配置方案。结果表明:基于NSGA-Ⅲ可以快速形成研究区多目标下的Pareto解集,且解集内的各目标效益均优于2020年土地利用效益值。生态安全优先发展、粮食生产优先发展和经济优先发展情景存在其他两项目标效益提升不明显的情况。相对来说,最小土地利用变化条件下的均衡效益发展情景可在土地利用变化幅度最小的情况下,达到更高、更均衡的综合效益。制订土地利用优化配置方案时,在参考各情景土地利用优化配置布局的基础上识别土地利用协调冲突区,有助于形成弹性的土地利用优化配置方案,以适应区域可能发生的内外部经济政策环境变化。
文摘背景:不同于非炎症性细胞凋亡,细胞焦亡是炎症性细胞死亡的一种形式,它伴随着膜完整性的破坏和促炎性细胞内物质的释放,因而与多种疾病有关。沉默信息调节因子家族是依赖于烟酰胺腺嘌呤二核苷酸的组蛋白去乙酰化酶家族。除了去乙酰化外,还具有其他酶活性,如脱琥珀酸化、脱丙酰化和腺苷二磷酸-核糖基化等,在参与细胞焦亡调控中发挥重要的作用。目的:综述沉默信息调节因子家族在细胞焦亡中的作用及影响。方法:第一作者通过检索PubMed、Web of Science、中国知网、万方数据库,检索时限为各数据库建库至2024年3月,中文检索词为“沉默信息调节因子,沉默信息调节因子1,沉默信息调节因子2,沉默信息调节因子3,沉默信息调节因子4,沉默信息调节因子5,沉默信息调节因子6,沉默信息调节因子7,细胞焦亡”,英文检索词为“Sirtuins,Sirtuin1,Sirtuin2,Sirtuin3,Sirtuin4,Sirtuin5,Sirtuin6,Sirtuin7,pyroptosis”,最后纳入71篇文献进行综述。结果与结论:①沉默信息调节因子家族均参与了对细胞焦亡的调控;②过表达沉默信息调节因子1、沉默信息调节因子4可通过多种通路抑制细胞焦亡,从而缓解细胞焦亡对机体的损害;③沉默信息调节因子3除了影响细胞焦亡经典通路外,还能通过增强线粒体活性氧的清除能力、有丝分裂来抑制细胞焦亡;④沉默信息调节因子5参与细胞内代谢和能量平衡的调节,包括能量的摄入、储存和消耗;⑤沉默信息调节因子6既能通过多种通路影响细胞焦亡,还能影响巨噬细胞M1极化、活性氧的生成以及细胞焦亡相关因子消皮素D的裂解以抑制细胞焦亡;⑥过表达沉默信息调节因子7可抑制细胞焦亡;⑦沉默信息调节因子2与其他家族成员不同,其被敲降后才可抑制细胞焦亡,但报道较少,需要更为深入与全面的研究。
基金This work was financed by the National Natural Science Foundation of China (Grant No. 40672103 , 40575065) the Program for New Century Excellent Talents in University of the Chinese Ministry of Education. The authors sincerely thank Professor Li Kaiqi for his constructive suggestions and useful discussions.
文摘In this paper, an experimental study was conducted in order to test the feasibility of sintering mullite directly from the high-alumina fly ash, without adding any extra material. The results show that the mullite contents in most sintered samples are over 70%. The samples sintered from the beneficiated fly ash have a higher content of mullite than those from the as-received fly ash under the same synthetic conditions. To obtain an equal amount of mullite, a higher sintering temperature is needed for the beneficiated fly ash than for the as-received fly ash. Considering the physical properties of sintered mullite, the favorable sintering temperature is 1400℃ for the as-received fly ash and 1500℃ for the beneficiated fly ash. A higher sintering temperature and a shorter holding time are profitable to sintering mullite. The orthogonal test confirmed that the dominant factor affecting mullite synthesis is sintering temperature, and that the most profitable matching conditions are 200 MPa-1500℃-3 h for the as-received fly ash and 200 MPa-1500 ℃-4 h for the beneficiated fly ash.