Results 11 to 20 of about 22,454 (115)
Zhejiang Daxue xuebao. Lixue ban, 2019 在MP2/ SMD/6-311++g（3df，2pd）//WB97X-D/SMD/6-311++G（d，p）理论水平上，研究了水液相环境下羟自由基诱导的苯丙氨酸分子的损伤机理。研究发现，羟自由基（水分子簇） 抽取α-氢、β-氢、苯环-氢以及羟自由基与苯环加成均可致苯丙氨酸分子损伤。势能面计算表明，羟自由基（水分子簇） 抽取α-氢和β-氢的最低能垒分别为68.4 和89.3 kJ·mol-1，羟自由基抽取苯环-氢的最低能垒为111.6 kJ·mol-1，羟自由基加成到苯环不同位点碳的能垒大约在106.5 ...
PANYu(潘宇) +6 more
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Membrane Lipid Peroxidation in Fluoride Poisoned Silkworm Larvae (Bombyx mori)
浙江大学学报. 农业与生命科学版, 2001 自从70年代提出生物自由基伤害学说以来，现已被广泛地用于研究需氧生物细胞的毒害机理．细胞自由基产生和清除的平衡遭到破坏时，自由基的增加会导致细胞的伤害．特别是自由基袭击了生物膜系统，使膜的磷脂双分子层中不饱和脂肪酸中的不饱和键发生过氧化而分解，从而造成整体膜的破坏．即所谓的“膜脂过氧化作用”．
LU Shun-lin, DING Chun-yang
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ESR study of free radicals photoinduced by C60 solution(C60光敏反应产生自由基的ESR研究)
Zhejiang Daxue xuebao. Lixue ban, 2002 富勒烯(C60)的吡啶溶液在光辐射下,以5,5-二甲基-1-吡咯啉-N-氧化物(DMPO)为捕捉剂,用电子自旋共振法(ESR)直接检测到很强的ESR信号,证明C60在光辐射下有自由基产生.通过计算机的ESR模拟和分析,认为得到的ESR信号为[DMPO-O2-]·与[DMPO-OH]·的叠加信号.当分别用超氧化物歧化酶和甘露醇为清除剂时,ESR信号明显降低,证明在光辐射下产生的自由基为超氧阴离子自由基()和羟自由基(OH·).
FENGYa-fei(冯亚非)
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Study on Antioxidant Activity and Active Ingredients of Black Garlic Blueberry Wine(黑蒜蓝莓酒抗氧化能力及活性成分研究) [PDF]
Shipin kexue jishu xuebao, 2017 The anthocyanins, total flavonoids, and total phenol in three formulation wines of black garlic blueberry were determined. Meanwhile, the removal ability of hydroxyl radicals, DPPH free radicals, and superoxide anion as well as the inhibition rate of LPO
JI Yanru(姬妍茹) +7 more
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Gongye shui chuli, 2020 随着环境污染日益严重，各种形式的高级氧化技术逐渐发展起来。其中活化过硫酸盐高级氧化技术由于原料易得，效果显著等优点颇受人们关注。过硫酸盐活化主要产生硫酸根自由基和羟基自由基两种高活性自由基，能够有效去除难降解有机污染物。阐述了过硫酸盐活化体系中两种主要活性自由基的特点及其与有机物的反应机理；综述了活化过硫酸盐的不同方式，做了各种活化方法的技术经济优劣性分析，并对存在问题进行了分析和展望。
米记茹 +6 more
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Functional Ecology, EarlyView.Read the free Plain Language Summary for this article on the Journal blog. Abstract Drylands are mainly structured by both vascular plants and biological soil crusts (biocrusts), the latter often regarded as a self‐organizing component of these ecosystems.
Haoran Luo +13 more
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Zhongguo shiyan zhenduanxue, 2021 细胞通过有氧代谢使生命活动得以进行和维持,有氧代谢过程中会产生活性氧(ROS)等多种自由基[1]。自由基对细胞来说是一把双刃剑,一方面,自由基是有氧代谢所必备的;另一方面,对机体存在毒性。许多实验已经表明,自由基反应能导致细胞退化、老化、裂解[2]。H2O2是一种ROS,在诱导细胞的损伤、死亡中起关键作用。它能损伤DNA、使酶失活、氧化激素、破坏细胞膜的完整性,甚至杀死细胞等,是多种疾病的起点[3]。
李波, 信瑞, 柳承鑫, 曲丹华
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Multi‐gradient warming reshapes functional traits and adaptive responses of alpine meadow plants
Functional Ecology, EarlyView.Read the free Plain Language Summary for this article on the Journal blog. Abstract Plant functional traits in alpine meadows are critical indicators of ecosystem responses to climate warming, yet dynamic changes in trait networks across warming gradients and their consequences for community functions remain poorly understood.
Zhiwei Yan +6 more
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Phenology drives asymmetric responses of ecosystem productivity stability to warming and cooling
Functional Ecology, EarlyView.Read the free Plain Language Summary for this article on the Journal blog. Abstract Ecosystem productivity stability is a key indicator of ecosystem functioning under climate change, but the role of cooling periods in increasingly variable climates remains poorly resolved.
Yao Wei +11 more
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Housing policies and market returns in China: Evidence from a novel policy index
Real Estate Economics, EarlyView.Abstract This article examines the relationship between housing policy interventions and market returns in China with a novel policy index. Using natural language processing techniques, we construct a sentence‐level policy index based on government policy documents from 2008 to 2024.
Siu Kei Wong, Yumou Wang
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