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Variation in humic and fulvic acids during thermal sludge treatment assessed by size fractionation, elementary analysis, and spectroscopic methods

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Frontiers of Environmental Science & Engineering 2014年第6期8卷 854-862页

作者： yuning YANG Huan LI Jinyi LI Key Laboratory of Microorganism Application and Risk Control of Shenzhen Graduate School at Shenzhen Tsinghua University Shenzhen 518055 China Joint Research Center of Urban Resource Recycling Technology of Graduate School at Shenzhen Tsinghua University and Shenzhen Green Eco-Manufacturer High-Tech Co. Ltd. Shenzhen 518055 China

Thermal pretreatment can be applied to sludge anaerobic digestion or dewatering. To analyze the variation in humic substances during thermal sludge treatment, sludge humic and fulvic acids were extracted before and after 30-min thermal treatment at 180℃, and then their contents, molecular weight distributions, elementary compositions, and spectral characteristics were compared. The results showed that the total contents of humic and fulvic acids in the sludge almost remained constant during thermal treatment, but 35% ofhumic and fulvic acids were dissolved from the sludge solids. Moreover, both humic and fulvic acids were partly decomposed and 32% of humic acids were converted to fulvic acids. The median value of the molecular weights of humic acids decreased from 81 to 41 kDa and that of fulvic acids decreased from 15 to 2 kDa. Besides the reduction in molecular size, the chemical structures of humic and fulvic acids also exhibited a slight change, i.e. some oxygen functional groups disappeared and aromatic structures increased after thermal sludge treatment.

关键词： sludge thermal treatment humic acids fulvic acids

基于cag致病岛探讨胃“炎-癌”转化的中医核心病机

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中国中西医结合消化杂志 2024年第8期32卷 735-740页

作者：姜天童刘震(审校) 白宇宁王少丽田志华陈敬予李萌中国中医科学院广安门医院消化科北京100053

幽门螺杆菌(Helicobacter pylori,HP)是目前已知的诱发胃癌的首要可控危险因素。cag致病岛作为Ⅰ型HP强致病力产毒菌株的特殊生理学标志,具有编码致病菌中毒素、黏附因子、侵袭因子或其他毒力因子基因的作用,与HP对胃上皮细胞的毒力损... 详细信息

幽门螺杆菌(Helicobacter pylori,HP)是目前已知的诱发胃癌的首要可控危险因素。cag致病岛作为Ⅰ型HP强致病力产毒菌株的特殊生理学标志,具有编码致病菌中毒素、黏附因子、侵袭因子或其他毒力因子基因的作用,与HP对胃上皮细胞的毒力损害和致癌机制有直接关系。结合现代医学cag致病岛诱导胃“炎-癌”转化机制与中医学理论研究,认为胃“炎-癌”转化的中医核心病机为“脾虚湿困,毒损络阻”。本文通过探讨cag致病岛及其相关毒力因子的致炎致癌机制,阐释胃“炎-癌”转化的中医核心病机及诊治规律,以求探索有益于延缓、逆转胃“炎-癌”转化级联过程的中西医结合诊疗思路。

关键词： cag致病岛幽门螺杆菌胃“炎-癌”转化胃癌病机

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牛百叶脱黑膜与涨发工艺的研究现状

食品安全导刊 2024年第3期 177-180,185页

作者：李昀玲牛千宝刘丽宅高胜博陈岩刘笑笑延边大学吉林延吉136200 吉林省农业科学院(中国农业科技东北创新中心) 吉林长春130033 农业农村部肉牛遗传育种重点实验室吉林长春130033 吉林省肉用草食家畜生产技术国际联合研究中心吉林长春130033 吉林省长春皓月清真肉业股份有限公司吉林长春130000

牛百叶是牛的副产品,具有独特的风味,富含多种营养成分,因此受到了很多消费者的喜爱,牛百叶的内表面附有一层黑色的黏膜,直接降低了食品的品质,因此脱黑膜十分必要。本文围绕现有牛百叶脱黑膜工艺与涨发工艺的相关研究,综述了牛百叶脱... 详细信息

牛百叶是牛的副产品,具有独特的风味,富含多种营养成分,因此受到了很多消费者的喜爱,牛百叶的内表面附有一层黑色的黏膜,直接降低了食品的品质,因此脱黑膜十分必要。本文围绕现有牛百叶脱黑膜工艺与涨发工艺的相关研究,综述了牛百叶脱黑膜剂与涨发剂的种类、辅助脱膜措施等研究现状,并对其未来发展进行展望,以期为牛百叶加工及产品开发提供借鉴与参考。

关键词：牛百叶脱黑膜辅助措施涨发

Mutation N856K in spike reduces fusogenicity and infectivity of Omicron BA.1

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Signal Transduction and Targeted Therapy 2023年第3期8卷 908-911页

作者： Chunyun Sun Huiyu Wang Ji Yang Desheng Kong yuning Chen Haiyue Wang Lingling Sun Jianbo Lu Min Teng Liangzhi Xie Beijing Engineering Research Center of Protein and Antibody Sinocelltech Ltd.Beijing 100176China Beijing Key Laboratory of Monoclonal Antibody Research and Development Sino Biological Inc.Beijing 100176China Cell Culture Engineering Center Chinese Academy of Medical Sciences&Peking Union Medical CollegeBeijing 100005China

Dear Editor,COVID-19 lung pathology is characterized by interstitial pneumonia with cell-cell fusion-induced syncytia and extensive tissue damage.1 The correlation between viral fusogenicity and pathogenicity has been reported in SARS-CoV-2 variants.2 Compared with the previous Delta or D614G variants,Omicron BA.1 has been proven to be less fusogenic and pathogenic.

关键词： lung pathology damage

金属有机框架/纳米酶复合SERS基底在生物医学分析领域的应用与展望

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光散射学报 2024年第1期36卷 16-22页

作者：胡森蒋雨宁曹佳颖郑强廷吴一萍郭小玉应叶刘新玲文颖杨海峰上海师范大学资源化学教育部重点实验室上海市稀土功能材料重点实验室上海市分子成像探针与传感器高校重点实验室上海200234

表面增强拉曼散射(Surface-Enhanced Raman Scattering,SERS)技术是基于分子振动指纹信息的分析方法,灵敏度高,选择好,可无损现场检测,加之水体系干扰小,在生物样本分析和医学早期诊断等领域有潜在的应用前景。纳米酶是人工模拟酶,与天... 详细信息

表面增强拉曼散射(Surface-Enhanced Raman Scattering,SERS)技术是基于分子振动指纹信息的分析方法,灵敏度高,选择好,可无损现场检测,加之水体系干扰小,在生物样本分析和医学早期诊断等领域有潜在的应用前景。纳米酶是人工模拟酶,与天然酶相比,易于批量制备、种类多样和环境稳定的优点。金属有机框架化合物(Metal-organic framework,MOF)便于设计和合成,具有介孔晶体结构,比表面积大,可固载其它纳米材料,提高稳定性。本综述关注纳米酶、MOF与SERS基底复合提高分析性能和稳定性,重点介绍了基于MOF/纳米酶/SERS技术平台在生物医药分析领域的应用现状与展望。

关键词：表面增强拉曼散射金属有机框架纳米酶生物医学分析

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一种传感器型故障指示器在配电网中的应用

宁夏电力 2024年第4期 37-40,48页

作者：杜严行张国清王豫宁王玉财翟虎成张泽锋国网宁夏电力有限公司宁东供电公司宁夏银川750411 国网宁夏电力有限公司石嘴山供电公司宁夏石嘴山753000

为实现配电网单相接地故障的快速选线感知及定位,方便抢修人员快速处理故障,提出一种利用传感器型故障指示器与现有配电自动化终端零序电流进行单相接地故障定位的方法。应用结果表明,该型传感器在单相接地故障判别方面具有灵敏性高、... 详细信息

为实现配电网单相接地故障的快速选线感知及定位,方便抢修人员快速处理故障,提出一种利用传感器型故障指示器与现有配电自动化终端零序电流进行单相接地故障定位的方法。应用结果表明,该型传感器在单相接地故障判别方面具有灵敏性高、金属性单相接地故障的检测优势,应用该传感器与现有配电自动化终端可准确实现金属性单相接地故障定位。

关键词：配电网传感器暂态零序电流故障指示器故障定位

Fabrication of SmCo_(5) alloy via cobalt-induced calciothermic reduction and magnetic properties of its ribbon

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Journal of Rare Earths 2021年第5期39卷 572-578页

作者： Donghui Liu Fei Niu Xiaolin Zhang yuning Meng Youming Yang Faculty of Materials Metallurgy and ChemistryJiangxi University of Science and TechnologyGanzhou 341000China Institute of Engineering Research Jiangxi University of Science and TechnologyGanzhou 341000China National Engineering Research Center for Ionic Rare Earth Ganzhou 341000China

SmCo_(5)alloy was prepared via direct calciothermic reduction using anhydrous samarium fluoride(SmF_(3))as raw material and cobalt as *** of the thermodynamic calculation show that the direct reduction of cobalt-induced SmF_(3)for preparing SmCo_(5)alloy is *** alloy with 33.89 wt%samarium and a yield of 96.45%were achieved under the optimal conditions of 10%and 20%excess of SmF_(3)and calcium over the stoichiometry,respectively,and 1450℃for 4 *** X-ray diffraction results show that the reduction products are SmCo_(5)alloy and CaF_(2).The scanning electron microscopy micrograph of the SmCo_(5)alloy ingot exhibits a distinct dendritic morphology composed of samarium and *** X-ray photoelectron spectroscopy shows that the atomic ratio of samarium to cobalt is approximately 1:5 and both elements demonstrate zero valency(Sm^(0),Co^(0)).The magnetic properties measurement of the SmCo_(5)alloy melt-spun ribbon shows the remanent magnetization B_r=0.59 T,intrinsic coercivity H_(Ci)=345.82 kA/m and maximum magnetic energy density(BH)_(max)=42.20 kJ/m^(3).These results may be helpful for the development of novel valence-variable rare-earth alloys.

关键词： Calciothermic reduction Cobalt-induced SmF_(3) SmCo_(5) Preparation Rare earths

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水稻—油菜轮作模式下稻套油栽培技术

安徽农学通报 2024年第6期30卷 1-4页

作者：韩仁长朱先飞邹玉宁黄冠丁龙余洪根方先勇安徽国豪农业科技有限公司安徽合肥230031

油菜是重要油料作物之一,水稻套播油菜作为稻油轮作生产的一项重要农业技术,对提高粮油产量,实现农业可持续发展具有重要意义。本文分析了稻套油模式的优势以及栽培技术要点,为推广油稻轮作栽培技术提供参考。

关键词：稻油轮作稻套油免耕直播

Extraction and back-extraction behaviors of 14 rare earth elements from sulfuric acid medium by TODGA

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Journal of Rare Earths 2018年第6期36卷 642-647页

作者： Huiting Yuan Weixiang Hong Yushan zhou Baisong Pu Aijun Gong Tao Xu Qishan Yang Fukai Li Lina Qiu Weiwei Zhang yuning Liu School of Chemistry and Biological Engineering University of Science and Technology BeijingBeijing 100083China North China Rare Earth Hi-Tech Company Limited Baotou 014030China School of Chemistry and Chemical Engineering Inner Mangolia University of Science and TechnologyBaotou 014010China

The unique physical and chemical properties of rare earth elements lay the foundation for their extensive application. N,N,N’,N’ Tetra-octyl-3-oxopentanediamide(TODGA) is excellent in its ability of extracting rare earth elements and it is favored for green initiative. In this paper, the extraction and back-extraction of14 rare earth elements by TODGA were studied. Experiments show that in conditions of 6 mol/L sulfuric acid, the extraction temperature of 25 ℃,the phase ratio of 1:1 and 0.04 mol/LTODGA(aviation kerosene as the diluent), the extraction rates of 14 rare earth elements including lanthanum, cerium, praseodymium,neodymium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, and yttrium were 99.00%-99.73%. Mixed with hydrochloric acid and nitric acid(HCl 3.5 mol/L, HNO30.5 mol/L), the recoveries of the 14 rare earth elements are 91.52%-99.91% when the extraction temperature is 25 ℃ and the ratio is 1:1. The following application is based on the optimum conditions above with practical samples(from the roasting production line of China North Rare Earth High-tech Company Limited) for extraction and back-extraction experiments. Experiments show that TODGA has excellent enrichment effect on 14 rare earth elements, the extraction rates are 91.36%-99.80%, the back-extraction rates are 87.29%-99.64% and the total recoveries are 81.19%-99.44%.

关键词： Rare earth Extraction Back-extraction N,N,N',N' Tetra-octyl-3-oxopentanediamide(TODGA) Enrichment