Results 21 to 30 of about 22,454 (115)
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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Subspecies taxonomy reflects social and geographic patterns of taxonomic effort in tetrapods
Conservation Biology, EarlyView.Abstract Subspecies have been used in conservation biology to account for intraspecific patterns in genetic diversity, which is crucial to long‐term population viability. Although over 3200 subspecies are currently assessed by the International Union for Conservation of Nature Red List, their biological relevance remains controversial.
Jhonny J. M. Guedes +3 more
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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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Using the capabilities approach to achieve people‐centered conservation
Conservation Biology, EarlyView.Abstract Top‐down interventions carried out by state and nonstate institutions to conserve biodiversity and improve the lives of forest‐proximate people (FPP) in the Global South tend to reflect economistic understandings of human well‐being. More progressive and people‐centered conservation projects are guided by normative visions of how the world ...
Arthur Rodrigues +4 more
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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 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
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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AI foundation models in plant biology
New Phytologist, EarlyView.Foundation models decode genomes, engineer proteins, phenotype crops, and drive AI agents across plant biology. This figure was created in BioRender (BioRender.com/xcmmkel). Summary Rapid technological progress has enabled plant biologists to accumulate unprecedented volumes of multi‐scale, multi‐modal data, yet this abundance of data has intensified ...
Haopeng Yu
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Zhongguo shiyan zhenduanxue, 2002 目的 证实西比灵对急性脑梗死患者血清中自由基的影响。方法 选取急性脑梗死患者 ,随机分为一般治疗组、自由基清除剂治疗组、西比灵治疗组、自由基清除剂加西比灵治疗组 ,对各组患者于治疗前后进行疗效评定 ,于治疗前、治疗后 3、7、15d分别采静脉血 ,应用WSPS法测定LPO含量 ,化学发光法测定SOD活性。结果 西比灵治疗组LPO含量降低 ,SOD活性稳定 ,自由基清除剂加西比灵组LPO含量降低更加明显。结论 西比灵可抑制脑梗死患者脑组织内自由基的生成 ,与自由基清除剂联合应用疗效更加显著 ...
刘松岩 +4 more
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