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COVID-19 patient with an incubation period of 27 d:A case report

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World Journal of Clinical Cases 2021年第21期9卷 5955-5962页

作者： Xue Du Yang Gao Kai Kang Yang Chong Mei-Ling Zhang Wei Yang Chang-Song Wang Xiang-Lin Meng Dong-Sheng Fei Qing-Qing Dai Ming-Yan Zhao Department of Critical Care Medicine The First Affiliated Hospital of Harbin Medical UniversityHarbin 150001Heilongjiang ProvinceChina Department of Critical Care Medicine The Sixth Affiliated Hospital of Harbin Medical UniversityHarbin 150028Heilongjiang ProvinceChina Institute of Critical Care Medicine The Sino Russian Medical Research Center of Harbin Medical UniversityHarbin 150081Heilongjiang ProvinceChina Department of Critical Care Medicine The Harbin Medical University Cancer HospitalHarbin 150081Heilongjiang ProvinceChina Department of Critical Care Medicine The Second Affiliated Hospital of Harbin Medical UniversityHarbin 150086Heilongjiang ProvinceChina

BACKGROUND As a highly contagious disease,coronavirus disease 2019(COVID-19)is wreaking havoc around the world due to continuous spread among close contacts mainly via droplets,aerosols,contaminated hands or ***,centralized isolation of close contacts and suspected patients is an important measure to prevent the transmission of *** present,the quarantine duration in most countries is 14 d due to the fact that the incubation period of severe acute respiratory syndrome coronavirus type 2(SARS-CoV-2)is usually identified as 1-14 d with median estimate of 4-7.5 *** COVID-19 patients in the incubation period are also contagious,cases with an incubation period of more than 14 d need to be *** SUMMARY A 70-year-old male patient was admitted to the Department of Respiratory Medicine of The First Affiliated Hospital of Harbin Medical University on April 5 due to a cough with sputum and shortness of *** April 10,the patient was transferred to the Fever Clinic for further treatment due to close contact to one confirmed COVID-19 patient in the same *** the period from April 10 to May 6,nucleic acid and antibodies to SARS-CoV-2 were tested 7 and 4 times,respectively,all of which were *** May 7,the patient developed fever with a maximum temperature of 39℃,and his respiratory difficulties had *** results of nucleic acid and antibody detection of SARS-CoV-2 were *** May 8,the nucleic acid and antibody detection of SARS-CoV-2 by heilongjiang Provincial Center for Disease Control were also positive,and the patient was diagnosed with COVID-19 and reported to the Chinese Center for Disease Control and *** This case highlights the importance of the SARS-CoV-2 incubation *** epidemiological investigations and clinical observations are urgently needed to identify the optimal incubation period of SARS-CoV-2 and formulate rational and evidence-based quarantine policies for COVID-19

关键词： COVID-19 Incubation period Quarantine duration SARS-CoV-2 Case report

Boosting electrocatalytic activity for CO_(2) reduction on nitrogen-doped carbon catalysts by co-doping with phosphorus

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Journal of Energy Chemistry 2021年第3期30卷 143-150页

作者： Shuo Chen Tianfu Liu Samson O.Olanrele Zan Lian Chaowei Si Zhimin Chen Bo Li Key Laboratory of Functional Inorganic Material Chemistry(Ministry of education of China) School of Chemistry and Materials ScienceHeilongjiang UniversityHarbin 150080HeilongjiangChina Shenyang national Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016LiaoningChina

Electrochemical reduction of CO_(2)(CERR)to value-added chemicals is an attractive strategy for greenhouse gas mitigation,and carbon recycles *** metal catalysts suffered from low durability and sluggish kinetics impede the practical *** the other hand,doped carbon materials recently demonstrate superior catalytic performance in CERR,which shows the potential to diminish the problems of metal catalysts to some ***,we present the design and fabrication of nitrogen(N),phosphorus(P)co-doped metal-free carbon materials as an efficient and stable electrocatalyst for reduction of CO_(2) to CO,which exhibits an excellent performance with a high faradaic efficiency of 92%(-0.55 V ***)and up to 24 h stability.A series of characterizations including TEM and XPS verified that nitrogen and phosphorous are successfully incorporated into the carbon ***,the comparisons between co-doping and single doping catalysts reveal that co-doping can significantly increase CERR *** improved catalytic activity is attributed to the synergetic effects between nitrogen and phosphorous dopants,which effectively modulate properties of the active *** density functional theory(DFT)calculations were also performed to understand the synergy effects of *** is revealed that the phosphorous doping can significantly lower the Gibbs free energy of COOH^(*)***,the introduction of the second dopants phosphorous can reduce the reaction barrier along the reaction path and cause polarization of density of states at the Fermi *** changes can greatly enhance the activity of the *** a combined experimental and computational exploration,current work provides valuable insights into the reaction mechanism of CERR on N,P co-doped carbon catalysts,and the influence from synergy effects between dopants,which paves the way for the rational design of novel metal-free catalysts for CO2 electro-reduction.

关键词： Metal-free catalyst CO_(2)reduction Co-doping,DFT

Neuroprotective effect of Eleutheroside B on 1-methyl-4-phenylpyridinium ion-induced apoptosis in PC12 cells

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Neural Regeneration Research 2011年第18期6卷 1375-1379页

作者： Fang Lu Yang Dong Laijun Deng Shumin Liu Shihui Zhou Lifeng An Bo Tang Institute of Traditional Chinese Medicine Heilongjiang University of Chinese Medicine Harbin 150040 Heilongjiang Province China Key Laboratory of Chinese Materia Medica (heilongjiang University of Chinese Medicine) Ministry of Education Harbin 150040 Heilongjiang Province China Jiamusi College Heilongjiang University of Traditional Chinese Medicine Jiamusi 154007 Heilongjiang Province China

Apoptosis and viability of PC12 cells following 1-methyl-4-phenylpyridinium ion （MPP＋）-induced injury were monitored by flow cytometry, following Annexin V-propidium iodide double labeling, and 3-（4,5-Dimethylthiazol-2-yl）-2,5-diphenyltetrazolium bromide assay, respectively. The release of lactate dehydrogenase, superoxide dismutase activity and levels of malondialdehyde were determined by UV spectrophotometry. The changes in mitochondrial membrane potential and the intracellular concentration of calcium were determined by flow cytometry, and the activity of caspase-3 was monitored by western blot. According to cell viability and apoptosis studies, MPP＋-induced apoptosis in PC12 cells was inhibited in the presence of 10 tJg/mL of Eleutheroside B Our results indicate that the neuroprotective effect of Eleutheroside B, following MPP＋-induced apoptosis in PC12 cells, involves increasing the anti-oxidative stress capacity of cells, maintaining the high-energy state of mitochondrial membrane potential, reducing intracellular calcium concentration and inhibiting caspase-3 activity.

关键词： Eleutheroside B PC12 cells apoptosis 1-methyl-4-phenylpyridinium ion mitochondria Parkinson's disease

Improving Electrochemical Performance of Cellulose Fiber-based Supercapacitor Electrode Using Polypyrrole-wrapped Iron Oxyhydroxide

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Paper And Biomaterials 2021年第3期6卷 10-19页

作者： Youngchu Kang Hailan Jin Xianhui An Xueren Qian Key Laboratory of Bio-based Material Science&Technology(Northeast Forestry University)Ministry of education HarbinHeilongjiang Province150040China

Polypyrrole(PPy)@cellulose fiber-based composites have been widely investigated as electrode materials for use in flexible ***,they cannot readily provide high specific capacitance and cyclic stability owing to their inherent drawbacks,such as high resistance,Weber impedance,and volume expansion or collapse during charging/*** this study,iron oxyhydroxide(FeOOH)is incorporated in the abovementioned composite to decrease the equivalent series resistance,charge transfer resistance,and Weber impedance,thereby enhancing electron transfer and ion diffusion,which results in superior electrochemical *** PPy-wrapped FeOOH@cellulose fiber-based composite electrode with the molar ratio of FeSO_(4) to NaBH4 of 1∶1 exhibits a high specific capacitance of 513.8 F/g at a current density of 0.2 A/g,as well as an excellent capacitance retention of 89.4% after 1000 cycles.

关键词： cellulose fibers iron oxyhydroxide polypyrrole electrode material electrochemical performance

Boosting oxygen reduction activity and CO_(2) resistance on bismuth ferrite-based perovskite cathode for low-temperature solid oxide fuel cells below 600℃

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Journal of Energy Chemistry 2024年第3期90卷 600-609,I0013页

作者： Juntao Gao Zhiyun Wei Mengke Yuan Zhe Wang Zhe Lü Qiang Li Lingling Xu Bo Wei School of Physics Harbin Institute of TechnologyHarbin 150001HeilongjiangChina Key Laboratory of Functional Inorganic Material Chemistry Ministry of EducationSchool of Chemistry and Materials ScienceHeilongjiang UniversityHarbin 150080HeilongjiangChina School of Physics and Electronic Engineering Harbin Normal UniversityHarbin 150025HeilongjiangChina

Developing efficient and stable cathodes for low-temperature solid oxide fuel cells(LT-SOFCs) is of great importance for the practical ***,we propose a series of Sm-modified Bi_(0.7-x)Sm_xSr_(0.3)FeO_(3-δ) perovskites as highly-active catalysts for *** doping can significantly enhance the electrocata lytic activity and chemical stability of *** 600℃,Bi_(0.675)Sm_(0.025)Sr_(0.3)FeO_(3-δ)(BSSF25) cathode has been found to be the optimum composition with a polarization resistance of 0.098 Ω cm^2,which is only around 22.8% of Bi_(0.7)Sr_(0.3)FeO_(3-δ)(BSF).A full cell utilizing BSSF25 displays an exceptional output density of 790 mW cm^(-2),which can operate continuously over100 h without obvious *** remarkable electrochemical performance observed can be attributed to the improved O_(2) transport kinetics,superior surface oxygen adsorption capacity,as well as O_(2)p band centers in close proximity to the Fermi ***,larger average bonding energy(ABE) and the presence of highly acidic Bi,Sm,and Fe ions restrict the adsorption of CO_(2) on the cathode surface,resulting in excellent CO_(2) *** work provides valuable guidance for systematic design of efficient and durable catalysts for LT-SOFCs.

关键词： Low-temperature solid oxide fuel cell Perovskite cathode DFT calculations CO_(2) tolerance

Hollow Ni Mo-based nitride heterojunction with super-hydrophilic/aerophobic surface for efficient urea-assisted hydrogen production

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Journal of Energy Chemistry 2024年第8期95卷 428-439,I0009页

作者： Yuying Fan Ying Gu Dongxu Wang Yanqing Jiao Aiping Wu Chungui Tian Key Laboratory of Functional Inorganic Material Chemistry Ministry of Education of the People’s Republic of ChinaHeilongjiang UniversityHarbin 150080HeilongjiangChina College of Chemistry Chemical Engineering and Resource UtilizationNortheast Forestry UniversityHarbin 150040HeilongjiangChina

Hydrogen evolution reaction(HER)and urea oxidation reaction(UOR)are key reactions of the watercycling associated catalytic process/*** design of catalysts with a super-hydrophilic/aerophobic structure and optimized electron distribution holds great ***,we have designed a threedimensional(3D)hollow Ni/NiMoN hierarchical structure with arrayed-sheet surface based on a onepot hydrothermal route for efficient urea-assisted HER based on a simple hydrothermal *** Ni/NiMoN catalyst exhibits super-hydrophilic/aerophobic properties with a small droplet contact angle of 6.07°and an underwater bubble contact angle of 155.7°,thus facilitating an escape of bubbles from the *** functional theory calculations and X-ray photoelectron spectroscopy results indicate the optimized electronic structure at the interface of Ni and NiMoN,which can promote the adsorption/desorption of reactants and *** virtues combining with a large specific surface area endow Ni/NiMoN with efficient catalytic activity of low potentials of 25 mV for HER and 1.33 V for UOR at10 mA cm^(-2).The coupled HER and UOR system demonstrates a low cell voltage of 1.42 V at 10 mA cm^(-2),which is approximately 209 mV lower than water electrolysis.

关键词： Hydrogen evolution Transition metal nitrides Hollow heterojunctions Urea electrooxidation Super hydrophilic/aerophobic

Basal Energy Expenditure of Chinese healthy Adults:Comparison of Measured and Predicted Values

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Biomedical and Environmental Sciences 2020年第8期33卷 566-572页

作者： MAO De Qian WU Jing Huan HUANG Cheng Yu LI Ke Ji LIU Xiao Li ZHANG Shi Lian WANG Yan Ling CHEN Wei LI Ming YANG Xiao Guang PIAO Jian Hua Key Laboratory of Trace Element Nutrition of national health commission of the People’s Republic of China Department of Trace Element NutritionNational Institute for Nutrition and HealthChinese Center for Disease Control and PreventionBeijing 100050China West China School of Public health Sichuan UniversityChengdu 610041SichuanChina School of Public health Peking UniversityBeijing 100191China Shenzhen Center for Chronic Disease Control Shenzhen 518055GuangdongChina Hebei province Center for Disease Prevention and Control Shijiazhuang 050021HebeiChina Mudanjiang Center for Disease Prevention and Control Mudanjiang 157020HeilongjiangChina Peking Union Medical College Hospital Beijing 100730China

Objective This study aimed to measure the basal energy expenditure(BEE)of Chinese healthy adults and establish an accurate predictive equation for this *** In total,470 Chinese healthy adults had their BEE measured using the Cosmed K4b2 portable metabolic *** linear regression analysis was applied to develop new optimal equations for predicting *** bias,accuracy rate,concordance correlation coefficient(CCC),and root mean square error(RMSE)were used to evaluate the accuracy of the predictive *** There was a significant difference in BEE between males and females,with 5,954 kJ/d and 5,089 kJ/d,*** living in rural areas expended significantly higher BEE(5,885 kJ/d)than those in urban areas(5,279 kJ/d).Previous equations developed by Henry,Schofield,Harris-Benedict(HB),and Liu overestimated the BEE of Chinese healthy *** new equations derived from the present study displayed the smallest average bias and RMSE from the measured basal energy expenditure(mBEE).The CCC of the new equations was higher than other predictive equations,but it was lower than *** was no significant difference in the accuracy rate among all predictive *** Sex and regional differences in BEE were observed in Chinese healthy *** the widely used previous predictive equations nor the one derived in the present study were accurate enough for estimating the BEE of Chinese healthy *** study is required to develop more accurate equations for predicting the BEE of Chinese healthy adults aged between 20–45 years.

关键词： Basal energy expenditure Chinese healthy adults Indirect calorimetry Predictive equations

The Preparation of Nanosized Pd/ZSM-23 Bifunctional Catalysts for n-Hexadecane Hydroisomerization by Employing PHMB as the Growth Modifi er

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Transactions of Tianjin University 2023年第6期29卷 482-491页

作者： Jiazheng Sun Shuxiang Xiong Qiong Wu Wei Wang Wei Wu national Center for International Research on Catalytic Technology Key Laboratory of Functional Inorganic Materials Chemistry(Ministry of Education)Heilongjiang UniversityHarbin 150080China

The development of highly effective metal-zeolite bifunctional catalysts for the hydroisomerization of n-alkanes is a paramount strategy to produce second-generation biofuels with high *** this study,polyhexamethylene biguanide hydrochloride(PHMB)is precisely added to the initial gel to synthesize nanosized ZSM-23 zeolites(Z23-x PH).Due to orientation adsorption and steric hindrance effects of PHMB,each sample of Z23-x PH demonstrates enhanced mesoporosity in comparison with the conventional Z23-C ***,the Bronsted acid density of the Z23-x PH samples is also signifi cantly reduced due to a reduction in the distribution of framework Al at T2-T5 *** corresponding Pd/23-C and Pd/Z23-x PH bifunctional catalysts with 0.5 wt%Pd loading for n-hexadecane hydroisomerization are prepared by incorporating ZSM-23 zeolites as acid *** to the catalytic test results,the suitable addition of PHMB can effectively promote the iso-hexadecane *** Pd/Z23-2PH catalyst with an n_(PHMB)/n(_Si)molar ratio of 0.002 demonstrates the highest maximum iso-hexadecane yield of 74.1%at an n-hexadecane conversion of 88.3%.Therefore,the employment of PHMB has provided a simple route for the development of highly effective Pd/ZSM-23 catalysts for n-alkane hydroisomerization.

关键词： n-Hexadecane hydroisomerization Nanosized ZSM-23 zeolite PHMB Bifunctional catalyst

CoWO4 nanopaticles wrapped by RGO as high capacity anode material for lithium ion batteries

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Rare Metals 2017年第5期36卷 411-417页

作者： Peng Yu Lei Wang Xu Liu Hong-Gang Fu Hai-Tao Yu Key Laboratory of Functional Inorganic Material Chemistry Ministry of education of China Heilongjiang UniversityHarbin 150080China

Transition-metal oxides have attracted increased attention in the application of high-performance lithium ion batteries（LIBs）, owing to its higher reversible capacity,better structural stability and high electronic ***, CoWO4 nanoparticles wrapped by reduced graphene oxide（CoWO4–RGO） were synthesized via a facile hydrothermal route followed by a subsequent heat-treatment process. When evaluated as the anode of LIB, the synthetic CoWO4–RGO nanocomposite exhibits better Li^＋ storage properties than pure CoWO4 nanostructures synthesized without graphene oxide（GO）. Specifically, it delivers a high initial specific discharge capacity of1100 mAh·g^-1 at a current density of 100 mA·g^-1, and a good reversible performance of 567 mAh·g^-1 remains after the 100th cycle. Moreover, full battery using CoWO4–RGO as anode and commercial LiCoO2 powder as cathode was assembled, which can be sufficient to turn on a 3 V,10 mW blue light emitting diode（LED）. The enhanced electrochemical performance for lithium storage can be attributed to the three-dimensional（3D） structure of the CoWO4–RGO nanocomposite, which can accommodate huge volume changes, and synergetic effect between CoWO4 and reduced graphite oxide（RGO） nanosheets,including an increased conductivity, shortened Li^＋ diffusion path.

关键词： CoWO4 Transition-metal oxide Graphene Li-ion battery Anode