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Redistributing Cu species in Cu-SSZ-13 zeolite as NH3-SCR catalyst via a simple ion-exchange

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Chinese Journal of Chemical Engineering 2022年第1期35卷 329-341页

作者： Ben Liu Nangui Lv Chan Wang Hongwei Zhang yuanyuan Yue Jingdong Xu Xiaotao bi Xiaojun Bao National Engineering Research Center of Chemical Fertilizer Catalyst College of Chemical EngineeringFuzhou UniversityFuzhou 350002China Qingyuan Innovation Laboratory Quanzhou 362801China Sinochem Quanzhou Energy Technology Co LtdQuanzhou 362000China Department of Chemical&biological Engineering University of British Columbia2360 East MallVancouverBC V6T 1Z3Canada State Key Laboratory of Photocatalysis on Energy&Environment College of ChemistryFuzhou UniversityFuzhou 350116China

The nature and distribution of Cu species in Cu-SSZ-13 play a vital role in selective catalytic reduction of NO by NH3(NH3-SCR),but existing methods for adjusting the Cu distribution are complex and difficult to ***,we report a simple and effective ion-exchange approach to regulate the Cu distribution in the one-pot synthesized Cu-SSZ-13 that possesses sufficient initial Cu species and thus provides a“natural environment”for adjusting Cu distribution *** using this proposed strategy,a series of Cu-SSZ-13x zeolites with different Cu contents and distributions were *** is shown that the dealumination of the as-synthesized Cu-SSZ-13 during the ion-exchange generates abundant vacant sites in the double six-membered-rings of the SSZ-13 zeolite for relocating Cu2+species and thus allows the redistribution of the Cu *** catalytic results showed that the ion-exchanged Cu-SSZ-13 zeolites exhibit quite different catalytic performance in NH3-SCR reaction but superior to the parent *** structure–activity relationship analysis indicates that the redistribution of Cu species rather than other factors(e.g.,crystallinity,chemical composition,and porous structure)is responsible for the improved NH3-SCR performance and SO_(2) and H_(2)O *** work offers an effective method to precisely adjust the Cu distribution in preparing the industrial SCR catalysts.

关键词： Catalyst Zeolite Cu-SSZ-13 Ion-exchange Redistribution of Cu species Selective catalytic reduction(SCR)

Stability of phenolic compounds and drying characteristics of apple peel as affected by three drying treatments

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Food Science and Human Wellness 2021年第2期10卷 174-182页

作者： Qiancheng Ma Jinfeng bi Jianyong Yi Xinye Wu Xuan Li yuanyuan Zhao Key Laboratory of Agro-products Processing Ministry of Agriculture and Rural AffairsInstitute of Food Science and TechnologyChinese Academy of Agricultural SciencesBeijing 100193China School of Food Science and Technology Dalian Polytechnic UniversityDalian 116034China

To realize high-value utilization of discarded apple peel,this study investigated the effects of three selected commercial drying methods on drying kinetics,microstructure,color,phenolic stability and antioxidant capacity of apple *** peel was dehydrated by hot air drying(AD)at 75,65 and 55℃,heat pump drying(HP)at 65,55 and 45℃,and vacuum freeze-drying(FD),*** results showed that HP was superior to AD and FD in terms of drying *** addition,HP at 65℃provided high-quality dried apple peel due to less browning and brighter appearance,the highest retention of total phenolics(29.35 mg/g)and the strongest antioxidant activities,with the highest ABTS and FRAP value of 127.15 and 219.57μmol TE/g,*** content of the six major individual phenolics,*** acid,(-)-epicatechin,hyperoside,rutin,phlorizin and quercitrin,were found to be the highest in HP dried ***,the content of rutin was even increased after HP compared to the fresh *** drying efficiency,organoleptic quality and phenolic stability of the products,HP at 65°C is suggested for drying of apple peel.

关键词： Apple peel Heat pump drying Phenolic compounds Antioxidant capacity Color

Modified halloysite nanotubes reduce the toxic effects of zearalenone in gestating sows on growth and muscle development of their offsprings

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Journal of Animal Science and biotechnology 2016年第4期7卷 570-578页

作者： Rui Gao Qingwei Meng Jianan Li Min Liu yuanyuan Zhang Chongpeng bi Anshan Shan Institute of Animal Nutrition Northeast Agricultural University

Background： Zearalenone （ZEN） is an estrogenic mycotoxin that is primarily produced by Fusarium fungi and has been proven to affect the reproductive capacity of many species to varying degrees. The present experiment was designed to study the maternal persistent effects of zearalenone toxicity in gestating sows on growth and muscle development of their offsprings, and the alleviation of zearalenone toxicity by modified halloysite nanotubes （MHNTs）. Methods： Eighteen sows were fed with one of three dietary treatments that included the following：（1） a control diet, （2） a contaminated grain diet （with 50 % moldy corn, 2.77 mg/kg ZEN）, and （3） a contaminated grain diet （with 50 % moldy corn, 2.76 mg/kg ZEN）＋ 1% MHNTs. Each sow was exclusively fed its experimental diets from 35 to 70 d of gestation at a total of 2 kg daily. Muscle samples were collected from six piglets per treatment at birth, weaning and finishing. Results： The results showed that feeding the sows with the ZEN-contaminated diets from 35 to 70 d of gestation decreased the ADG, ADFI and G：F of their offsprings （P 〈 0.05）. The muscle fiber numbers in the newborn, weaning and growing-finishing pigs and the muscle fiber diameters at birth and weaning were also decreased by maternal ZEN exposure （P 〈 0.05）. The expressions of IGF-I, IGF-II, Myf-5 and Mstn at birth and IGF-II, Pax7, Myf-5 and MyoD1 at weaning were altered by feeding gestating sows with ZEN-contaminated diets （P 〈 0.05）. The MHNTs reduced most of the ZEN-induced toxic effects： the ADG and ADFI on growth performance, the muscle fiber numbers at weaning and finishing and the muscle fiber diameters at weaning （P 〈 0.05）. The expression levels of IGF-II and Mstn in newborn piglets and IGF-II and Myf-5 in weaning piglets were also prevented by adding 1% MHNTs （P 〈 0.05）. Conclusions： The present study demonstrated that the offsprings of sows fed with ZEN-contaminated diets from 35 to 70 day of gestation exhibited weakening on growth performance, p

关键词： Growth MHNTs Muscle development Offsprings Sows Zearalenone

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考虑分布式能源的智能配变台区系统设计

工业仪表与自动化装置 2022年第1期 112-116页

作者：孙文宇尹兆磊周迎伟毕圆圆赵磊张柏杨国网冀北电力有限公司承德供电公司河北承德067000

针对配变台区的功能智能化程度低问题,设计考虑分布式能源的智能配变台区系统。设计了遥信检测单元,完成了系统的硬件设计,结合分布式能源的负载特性与变化规律,确定变压器的容量。通过计算出配电台区变压器的无功功率补偿度,得到配变... 详细信息

针对配变台区的功能智能化程度低问题,设计考虑分布式能源的智能配变台区系统。设计了遥信检测单元,完成了系统的硬件设计,结合分布式能源的负载特性与变化规律,确定变压器的容量。通过计算出配电台区变压器的无功功率补偿度,得到配变台区变压器的容量,引入最优覆盖的基本思想,根据分布式能源的分布特点,分析了变压器的损耗,构建了智能配变台区无功功率补偿模型,结合智能配变台区继电安全保护算法设计,完成了系统的软件设计,实现了智能配变台区系统的设计。测试结果表明,考虑分布式能源的智能配变台区系统在硬件部分和软件部分都可以满足配变台区的功能需求。

关键词：分布式能源配变台区遥信检测功率补偿继电保护

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不同矫正状态对儿童青少年近视进展的影响

中华眼视光学与视觉科学杂志 2024年第4期26卷 261-268页

作者：柳国雍胡媛媛徐倩杨志鹏于明坤王艺蓉何明光毕宏生山东中医药大学眼科与视光医学院济南250014 山东中医药大学附属眼科医院济南250002 香港理工大学中国香港100872

目的:基于倾向性评分匹配(PSM)比较近视儿童青少年在不同矫正状态下的近视进展情况,为近视防控提供科学依据。方法:调查研究。于2021年9—10月采用多阶段分层整群随机抽样方法在山东省桓台县抽取4所小学和2所中学的在校学生共4657例。... 详细信息

目的:基于倾向性评分匹配(PSM)比较近视儿童青少年在不同矫正状态下的近视进展情况,为近视防控提供科学依据。方法:调查研究。于2021年9—10月采用多阶段分层整群随机抽样方法在山东省桓台县抽取4所小学和2所中学的在校学生共4657例。对其中配戴框架眼镜者根据近视矫正状态分为近视足矫组和近视欠矫组,以睫状肌麻痹后等效球镜度(SE)变化量和眼轴长度(AL)增长量评估2组儿童青少年随访1年近视进展情况,SE变化量=基线SE-随访SE,AL增长量=随访AL-基线AL。通过PSM对2组儿童青少年的基线特征进行1∶1匹配,得到组间基线均衡的样本。经PSM后,采用Mann-Whitney U检验比较组间SE变化量和AL增长量的差异,并采用多因素广义线性模型分析不同矫正状态对近视进展的影响。结果:共纳入近视儿童青少年458例,年龄6~14(10.7±2.0)岁,男生48.9%(224/458)。PSM后,近视足矫组156例,近视欠矫组156例,2组的性别、年龄、基线SE和基线AL等数据差异均无统计学意义(均P>0.05)。与近视足矫组相比,近视欠矫组的SE变化量和AL增长量均较大(Z=-4.91,P<0.001;Z=-6.14,P<0.001)。多因素广义线性模型分析显示,在调整性别、年龄、基线SE、基线AL、父母近视、室内近距离用眼时间和户外活动时间后,近视欠矫与SE变化量(β=0.29,95%CI:0.18~0.39,P<0.001)、AL增长量(β=0.17,95%CI:0.13~0.21,P<0.001)均呈正相关。结论:近视欠矫可能会导致儿童青少年近视进展加快,应定期进行随访检查,及时对近视儿童青少年进行足矫。

关键词：近视近视欠矫近视进展儿童青少年

Degradation kinetics of larotaxel and identification of its degradation products in alkaline condition

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Journal of Pharmaceutical Analysis 2017年第2期7卷 118-122页

作者： Xiaoming Liang Zhenzhen Liu Huiyan Shi yuanyuan Zhang Shixiao Wang Kaishun bi Xiaohui Chen Department of Pharmaceutical Analysis School of PharmacyShenyang Pharmaceutical University Department of Functional Science School of MedicineYangtze University

Larotaxel, a new taxane compound prepared by partial synthesis from 10-deacetyl baccatin III, is active against tumors. In this research, a selective LC–MS method was developed and validated for the study of degradation kinetics of larotaxel, which was carried out in aqueous solutions with different pH（1.5, 3.0, 5.0, 6.5, 7.4, 9.0, 10 and 11.0） and temperature（0, 25, 37 and 45 °C）. The linear range was 0.5–25 μg/mL, the intra-and inter-day precisions were less than 7.0%, and accuracy ranged from 97.4–104.5% for each analyte. The observed rate obtained by measuring the remaining intact larotaxel was shown to follow first-order kinetics. The activation energies for degradation were 126.7 and 87.01 k J/mol at pH 1.5 and 11, respectively. Although larotaxel was stable in pH 5, 6.5 and 7.4 buffers at 37 °C for 24 h during our study, increasing or decreasing the pH of the solutions would decrease its stabilities. Moreover, three main degradation products in alkaline condition were separated by HPLC and identified by Q–TOF–MS. The three degradation products were confirmed as 10-deacetyl larotaxel, 7, 8-cyclopropyl baccatin Ⅲ and 10-deacetyl-7, 8-cyclopropyl baccatin Ⅲ.

关键词： Larotaxel Degradation kinetics pH Temperature Degradation products

“思、专、产、创”互融互通教学体系的构建--以食品质量与安全专业为例

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山东农业工程学院学报 2024年第8期41卷 124-128页

作者：毕文慧程媛媛郝征红于克学山东农业工程学院食品科学与工程学院山东济南250100

为提升创新创业教育质量,实现高水平、高素质专业型创新人才培养的目的,本研究强调思政教育引领教学活动,通过课程思政使学生树立正确价值观,形成长效创新驱动机制及产业服务意识,为创新创业实践注入活力;通过开发食品专业创新创业课程... 详细信息

为提升创新创业教育质量,实现高水平、高素质专业型创新人才培养的目的,本研究强调思政教育引领教学活动,通过课程思政使学生树立正确价值观,形成长效创新驱动机制及产业服务意识,为创新创业实践注入活力;通过开发食品专业创新创业课程,构建了食品质量与安全专业专创融合的课程体系;并将创新创业教育内容与食品产业需求对接,以实际需求为导向开展创新创业活动。从而实现了思政教育、专业教育、产业实践与创新创业教育的互融互通,形成了富有特色的食品质量与安全专业创新创业教学体系,并为相关专业的人才培养提供了参考。

关键词：思政引领专创融合产创融合教学体系

Altered hACE2 binding affinity and S1/S2 cleavage efficiency of SARS-CoV-2 spike protein mutants affect viral cell entry

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Virologica Sinica 2023年第4期38卷 595-605页

作者： Ke Wang Yu Pan Dianbing Wang Ye Yuan Min Li yuanyuan Chen Lijun bi Xian-En Zhang National Key Laboratory of biomacromolecules Institute of BiophysicsChinese Academy of SciencesBeijing100101China Faculty of Synthetic biology Shenzhen Institute of Advanced TechnologyShenzhen518055China University of Chinese Academy of Sciences Beijing100101China

SARS-CoV-2 variants are constantly emerging,hampering public health measures in controlling the number of *** it is well established that mutations in spike proteins observed for the different variants directly affect virus entry into host cells,there remains a need for further expansion of systematic and multifaceted ***,we comprehensively studied the effect of spike protein mutations on spike expression and proteolytic activation,binding affinity,viral entry efficiency and host cell tropism of eight variants of concern(VOC)and variants of interest(VOI).We found that both the full-length spike and its receptor-binding domain(RBD)of Omicron bind to hACE2 with an affinity similar to that of the *** addition,Alpha,Beta,Delta and Lambda pseudoviruses gained significantly enhanced cell entry ability compared to the wild-type,while the Omicron pseudoviruses showed a slightly increased cell entry,suggesting the vastly increased rate of transmission observed for Omicron variant is not associated with its affinity to *** also found that the spikes of Omicron and Mu showed lower S1/S2 cleavage efficiency and inefficiently utilized TMPRSS2 to enter host cells than others,suggesting that they prefer the endocytosis pathway to enter host ***,all variants'pseudoviruses we tested gained the ability to enter the animal ACE2-expressing *** the infection potential of rats and mice showed significantly increased,strongly suggesting that rodents possibly become a reservoir for viral *** insights gained from this study provide valuable guidance for a targeted approach to epidemic control,and contribute to a better understanding of SARS-CoV-2 evolution.

关键词： SARS-CoV-2 Variants of Concern(VOC) Omicron binding affinity Viral entry Host-tropism

Studies on Hemolysis of Hemolysin Produced by Synechocystis sp. PCC 6803

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Journal of Ocean University of China 2011年第4期10卷 362-368页

作者： bi Shuai WANG Wei ZHAO yuanyuan RU Shaoguo LIU Yunzhang College of Marine Life Sciences Ocean University of ChinaQingdao 266003P.R.China

Hemolysin produced by various bacteria,may destroy erythrocyte membranes via a pore-forming mechanism,a deter-gent action,or a lipase *** to this experiment,the mode of action used by cyanobacterial hemolysin had not been *** characterize the action mode of hemolysin produced by the wild-type strain of Synechocystis ***6803,hemolysis of erythrocytes originating from human,mouse,sheep,rabbit and goldfish was *** erythrocytes of mouse,sheep and rabbit were sensitive,while those of human and fish were resistant,to this *** rabbit erythrocytes,it was shown that hemoly-sis occurred in two steps:a binding step within the first 10 min of treatment and a lytic step after 30 *** binding and lysis were highly *** of erythrocyte density on hemolysis suggest that the hemolysin might target erythrocytes via a multiple-hit *** the osmotic protection experiment,all tested osmotic protectants,with molecular diameters ranging from 0.9 ?5.66 nm,failed to effectively inhibit *** electron micrographs showed that the hemolysin caused protuberances or echinocytes in rabbit erythrocytes,and then disrupted and ruptured the *** of hemolysis showed distinct differences from other pore-forming mechanisms,suggesting that this hemolysin might act through a detergent-like or lipase mecha-nism,rather than a pore-forming mechanism.

关键词： cyanobacterium Synechocystis sp.PCC 6803 hemolysin erythrocyte hemolysis