Results 41 to 50 of about 22,086 (119)
Zhejiang Daxue xuebao. Lixue ban, 2007 建立一种以luminol试剂为发光底物，检测连二亚硫酸钠水溶液体系产生的超氧阴离子自由基的化学发光法.研究表明，当luminol的浓度为0.05 mg/mL，连二亚硫酸钠浓度为0.012 mg/mL，体系pH=10.3时，可得最佳测定条件.分别测定了茶多酚、芦丁、槲皮素和抗坏血酸清除超氧阴离子自由基（）的能力.结果表明此方法操作简便、测量快速，能用于天然活性物质清除超氧阴离子能力的测定和清除自由基机理的研究.
SONGWei-hua(宋伟华) +2 more
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Mechanoluminescent Mixed‐Anion Borate Sr2B5O9Cl:Eu for Dynamic Anticounterfeiting
Rare Metals, Volume 45, Issue 7, July 2026.ABSTRACT Mechanoluminescence (ML)—the emission of light in response to mechanical stimuli—offers a direct and visually intuitive route for transducing mechanical information into optical signals. Herein, we report a mixed‐anion strategy to prepare mixed‐anion borate Sr2B5O9Cl:Eu phosphors through a facile, low‐temperature, and ambient‐atmosphere solid ...
Yuhong Han +7 more
wiley +1 more source
四川大学学报. 自然科学版, 2006 运用群论和原子分子静力学方法,推导了SiH(SiD)自由基分子基态的合理离解极限.采用多种方法和基组组合优化计算了SiH(SiD)自由基分子基态的平衡结构,振动频率和离解能.使用二次组态相互作用方法QCISD(T)结合6-311++g(3df,3pd)基组对SiH(SiD)自由基分子基态进行了单点能扫描计算.对标准的Murrell-Sorbie函数进行修正,用最小二乘法分别拟合Murrell-Sorbie函数和修正的Murrell-Sorbie函数得到了SiH(SiD ...
宋晓书 +4 more
doaj
Functional Ecology, Volume 40, Issue 7, Page 2332-2344, July 2026.Read the free Plain Language Summary for this article on the Journal blog. Abstract The stoichiometric ratios of carbon (C), nitrogen (N) and phosphorus (P) serve as important indicators for assessing nutrient balance in forest ecosystems, but their relationships with photosynthetic dynamics require deeper characterization.
Minghao Chen +9 more
wiley +1 more source
Zhongguo shiyan zhenduanxue, 2014 直结肠癌是世界第二大癌症,致死率也位居第二位。临床分期往往决定了直结肠癌患者的预后,早期阶段确诊的患者往往预后良好[1]。电子顺磁共振谱仪（EPR）可以测定血浆蛋白的功能特性,以HSA为例,采用具有稳定自由基结构（如氮氧自由基,doxyl）的长链脂肪酸作为人工引入的自由基,然后与血清白蛋白结合 ...
刘忠超 +4 more
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Functional Ecology, Volume 40, Issue 7, Page 2128-2142, July 2026.Read the free Plain Language Summary for this article on the Journal blog. Abstract Soil organic nitrogen (SON) transformation is critical for global nutrient cycling and ecosystem productivity, yet how its responsiveness to climate change differs across diverse land use types remains poorly resolved.
Xinyi Yang +10 more
wiley +1 more source
Rare Metals, Volume 45, Issue 6, June 2026.ABSTRACT Engineering of the catalyst interface and modulation of transition–metal d–band play critical roles in the electrocatalytic hydrogen evolution reaction (HER). Herein, a synthetic strategy is developed to fabricate nitrogen‐doped carbon nanotubes (N–CNTs)–supported Ni3Se4–CeO2 heterojunction catalysts through a facile chemical vapor deposition (
Zhiqiang Sun +10 more
wiley +1 more source
四川大学学报. 自然科学版, 2013 从猴头菇(Hericium erinaceus)子实体中,经过除杂、粉碎、热水浸提、醇沉处理后,得到了猴头菇杂聚糖粗提物,并运用DEAE-cellulose column进行柱层析分离纯化,得到猴头菇寡聚糖(HEO-A).通过水解,单糖分析,扫描电镜技术(SEM),高效凝胶渗透色谱(HPGPC),红外光谱技术(IR)和核磁共振技术(NMR)对猴头菇寡聚糖进行了初步的结构分析.结果显示,猴头菇寡聚糖由木糖和葡萄糖两种单糖构成,均重分子量为1877D.在体外化学模拟条件下 ...
王芳 +9 more
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Gongye shui chuli, 2023 环境中富集的各种有机污染物对生态系统和人体健康存在较大威胁。近年来，基于过硫酸盐（PS）的高级氧化技术（AOPs）因操作简单、成本较低且氧化还原能力强，在高效降解有机污染物方面展现出巨大潜力。铁基生物炭（Fe-biochar）由于具有吸附和催化的双重优势，在活化PS降解有机污染物领域得到了广泛应用。简述了Fe-biochar复合材料的制备方法，介绍了Fe-biochar活化PS过程的影响因素，分析了污染物降解过程中存在的反应机制。Fe-biochar不仅可以通过吸附作用去除污染物 ...
张洪涛 +7 more
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Atom Probe Tomography‐Based Analysis of Residual Trace Elements in Advanced Metallic Materials
Rare Metals, Volume 45, Issue 6, June 2026.ABSTRACT Residual trace elements inherited from raw materials strongly influence the mechanical and environmental performance of advanced metallic alloys and recycling materials due to preferable boundary/interface segregation and resultant embrittlement effects, yet their parts per million level concentrations pose significant challenges to ...
Congcong Li +17 more
wiley +1 more source