Results 21 to 30 of about 22,086 (119)
Zhongguo youzhi旨在为文冠果壳资源的综合利用提供参考，通过DPPH自由基、超氧阴离子自由基、羟自由基及脂质过氧自由基清除能力研究文冠果壳总皂苷和总黄酮的抗氧化活性,并分析了抗氧化活性与构效关系。结果表明：文冠果壳总皂苷和总黄酮均具有一定的DPPH自由基、超氧阴离子自由基、羟自由基及脂质过氧自由基清除能力，且文冠果壳总黄酮对4种自由基的清除能力均高于文冠果壳总皂苷；构效关系分析表明，文冠果壳总皂苷和总黄酮抗氧化活性差异与其化学结构有关。综上，从文冠果壳中提取总黄酮，并将其作为天然抗氧化剂进行开发 ...
刘荣徽，魏媛，刘超，赵光鸿，杨洋，刘玉冰，汪甜甜，王珊，史高峰，王国英LIU Ronghui, WEI Yuan, LIU Chao, ZHAO Guanghong, YANG Yang,
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Drivers of bat researchers’ intent to adopt field hygiene practices
Conservation Biology, EarlyView.Abstract Infectious disease is a growing threat to wildlife, with zoonotic transmission most likely at the human–wildlife interface. One underappreciated activity at this interface is fieldwork with wild animals, but associated risks can be mitigated through field hygiene (FH) practices, such as using personal protective equipment and other appropriate
Joanna L. Coleman +6 more
wiley +1 more source
Informal supply chains of wild meat from rural Amazonia and food security in an urban center
Conservation Biology, EarlyView.Abstract Iquitos, the most populated city in the Peruvian Amazon, is a hub in the regional supply chain of wild meat and supplies urban consumers. Studies on wild meat consumption have focused primarily on markets, limiting the scope of species considered to those that are economically valuable and potential inferences from those data.
Fiorella Briceño Huerta +3 more
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Assessing differences among elasmobranch nurseries to aid conservation based on a genomics framework
Conservation Biology, EarlyView.Abstract Elasmobranch nurseries often differ in environmental conditions, demographics, and use patterns. These differences affect the distribution of genetic variation among nurseries. However, conservation and management strategies often fail to account for such differences because they are difficult to characterize.
Dominic G. Swift +8 more
wiley +1 more source
四川大学学报. 自然科学版, 2003 利用荧光光度分析法研究了黑色素对羟基自由基的清除活性.羟基自由基由Cu2+催化过氧化氢氧化抗坏血酸的反应产生.研究表明在一定浓度范围内,黑色素清除羟基自由基能力与黑色素的初始浓度呈线性关系,不同来源的黑色素对羟基自由基的清除能力具有明显的不同.黑色素与尿酸、硫脲相比是更强的羟基自由基清除剂.
李晓燕, 刘志洪, 蔡汝秀
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International Journal of Applied Linguistics, EarlyView.ABSTRACT Research on English‐Medium‐Instruction (EMI) highlights inadequate support for students transitioning from L1‐medium‐instruction to EMI. To date, little research has focused on how L2 students’ adaptation to an EMI environment influences their L2 learning motivation (LLM).
Kevin W. H. Tai
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International Journal of Applied Linguistics, EarlyView.ABSTRACT Although the use of AI technologies (e.g., chatbots and automated writing evaluations (AWE)) has gained considerable attention in language learning fields in recent years, how AI technologies have been designed and implemented in language learning education, as well as their effectiveness, is understudied.
Shen Qiao +2 more
wiley +1 more source
Zhongguo shiyan zhenduanxue, 2011 过氧化脂质（Lipid Peroxidation LPO）是反映自由基对机体损伤的指标,超氧化物歧化酶（Superoxide Dismutase SOD）是生理状态下机体存在的防止自由基反应的酶,它能清除自由基 ...
姚刚, 马兴钢
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International Journal of Applied Linguistics, EarlyView.ABSTRACT Studies on classroom interactions suggest that displaying affiliation through linguistic and multimodal resources could promote positive emotions like enjoyment, thereby enhancing engagement and enthusiasm in second/foreign language learning.
Karen C. K. Choi, Kevin W. H. Tai
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Zhejiang Daxue xuebao. Lixue ban, 2019 采用密度泛函理论的B3LYP 方法、微扰理论的MP2 方法和自洽反应场（SCRF） 理论的SMD 模型方法，研究了水环境下羧基与氨基间为单氢键的α-Ala 旋光异构及羟自由基和氢氧根作用的反应。研究发现：α- Ala 的旋光异构可在a 和b 两个通道实现，a 通道为羧基顺反异构后，水分子簇作媒介质子以氨基为桥从α 碳的一侧向另一侧迁移；b 通道为水分子簇作媒介，质子从α 碳向氨基氮的迁移与羧基顺反异构协同进行。在a 通道，羟自由基水分子簇可致α-Ala 损伤。势能面计算表明：水环境下，在a 通道3 ...
YANHongyan(闫红彦) +3 more
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