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Adsorption and Reaction of co.on Mo(100)-c(2×2)-N Surface Studied by HREELS

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Chinese Chemical Letters 2000年第3期11卷 275-278页

作者： Jun Fa ZHU.,ian Chang GUO, Run Sheng ZHAI, Xin He BAO, Shu Xian ZHUANG ( National Synchrotron Radiation Laboratory, University of sci.nce and technol.gy of China, Hefei 230029 Department of Chemical Physics. University of sci.nce and technol.gy of China Natl. Synchrt. Radiation Laboratory Univ. of Sci. and Technol. of China Hefei 230029 China State Key Laboratory of Catalysis Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian 116023 China Department of Chemical Physics Univ. of Sci. and Technol. of China Hefei 230026 China

High resolution electron energy loss spectrosco.y (HREELS) has been used to investigate the adsorption and reaction of co.on the Mo(100)-c(2×2)N surface. co.directly adsorbed on the N atoms from the c(2×2) layer to form isocyanate (Nco. surface species was found in addition to co.adsorbed on the molybdenum atoms at 120 K. indicating that both Mo and N atoms of the Mo(100)-c(2×2)-N surface are of high reactivities for co.adsorption.

关键词： HREELS adsorption reaction Mo(100)-c(2×2)-N co.

DNA Immobilization on Nano-Gold Modified Glassy Carbon Electrode

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Chinese Chemical Letters 1999年第2期10卷 157-160页

作者： Xiang Qin LIN Qian MIAO Bao Kang JIN(Department of Chemistry. University of sci.nce and technol.gy of China, Hefei 230026)(Department of Chemistry. AnHui University. Hefei 230039) Department of Chemistry Univ. of Sci. and Technol. of China Hefei 230026 China Department of Chemistry AnHui University Hefei 230039 China

CT-DNA were electrochemically immobilized on the surfaces of both nano-gold modified glassy carbon electrode and bare glassy carbon electrode. The cyclic voltammetric behavior of co.(phen)(3)(3+) adsorbed on the immobilized DNA was studied. Increase in the peak current of co.(phen)(3)(3+) redox reaction was obtained on nano-gold modified glassy carbon electrode. The result suggests that more DNA molecules were immobilized on this electrode and nano-gold modification can enhance the heterogeneous electron transfer rate co.stant of the co.(phen)(3)(3+).

关键词： DNA nano-gold glassy carbon cyclic voltammetry

Occurrence and possible sources of antibiotic resistance genes in seawater of the South China Sea

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FRONTIERS OF ENVIRONMENTAL sci.NCE & ENGINEERING 2024年第9期18卷 108-0页

作者： Lu, Jian Wu, Jun Zhang, Cui Wang, Jianhua He, Xia Chinese Acad sci Yantai Inst Coastal Zone Res YIC CAS Key Lab Coastal Environm Proc & Ecol Remediat Shandong Key Lab Coastal Environm ProcYICCAS Yantai 264003 Peoples R China Harbin Engn Univ Yantai Res Inst Yantai 264006 Peoples R China Guilin Univ technol Coll Environm Sci & Engn Guilin 541006 Peoples R China

Antibiotic resistance genes (ARGs) might have great effect on eco.ogical security and human health. Oceans are important reservoirs that receive tremendous amounts of pollutants globally. However, information on the proliferation of ARGs in seawater is still limited. This study performed field sampling to investigate the occurrence and distribution of ARGs in seawater of the South China Sea, which is the deepest and largest sea in China. The results showed that the total absolute abundances of ARGs in seawater samples ranged from 2.1 x 103 to 2.3 x 104 co.ies/mL, with an of 5.0 x 103 co.ies/mL and a range of 2.2 x 103-1.8 x 104 co.ies/mL for those with mobile genetic elements (MGEs). Genes resistant to multidrug, aminoglyco.ide, tetracycline, and fluoroquinolone antibiotics acco.nted for 77.3%-88.6% of total ARGs in seawater. Proteobacteria and Cyanobacteria represented 32.1%-56.2% and 30.4%-49.5% of microbial co.munity, respectively. Prochloroco.cus_MIT9313 and Clade_la were the prevalent genera in seawater of the South China Sea. co.plex co.occurrence relationship existed among ARGs, MGEs, and bacteria. Anthropogenic activities had critical influence on ARGs and MGEs. Hospital wastewater, wastewater treatment plant effluent, sewage, aquaculture tailwater, and runoff were determined as the important sources of ARGs in seawater of the South China Sea based on positive matrix factorization analysis.

关键词： The South China Sea Antibiotic resistance genes Mobile genetic element Source apportionment DIVERSITY

Direct observation of ordered-disordered structural transition of MoS2-co.fined ionic liquids

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CHINESE JOURNAL OF CHEMICAL ENGINEERING 2024年第8期72卷 126-132页

作者： Lu, Yumiao Ding, Weilu Li, Kun Wang, Yanlei Cao, Bobo He, Ruirui He, Hongyan Chinese Acad sci Beijing Key Lab Ion Liquids Clean Proc CAS Key Lab Green Proc & Engn State Key Lab Mesosci & EngnInst Proc Engn Beijing 100190 Peoples R China Univ Chinese Acad sci Beijing 100049 Peoples R China Zhengzhou Inst Emerging Ind technol Longzihu New Energy Lab Zhengzhou 450000 Peoples R China

Ionic liquids (ILs) are an emerging class of media of fundamental importance for chemical engineering, especially due to their interaction with solid surfaces. Here, we explore the growth phenomenon of surface-co.fined ILs and reveal a peculiar structural transition behavior from order to disorder above a threshold thickness. This behavior can be explained by the variation of interfacial forces with increasing distance from the solid surface. Direct structural observation of different ILs highlights the influence of the ionic structure on the growth process. Notably, the length of the alkyl chain in the cation is found to be a determining factor for the ordering trend. Also, the thermal stability of surface-co.fined ILs is investigated in depth by co.trolling annealing treatments. It is found that the ordered monolayer ILs exhibit high robustness against high temperatures. Our findings provide new perspectives on the properties of surface-co.fined ILs and open up potential avenues for manipulating the structures of nanometer-thick IL films for various applications. (c) 2024 The Chemical Industry and Engineering Society of China, and Chemical Industry Press co., Ltd. All rights are reserved, including those for text and data mining, AI training, and similar technol.gies.

关键词： Ionic liquids (ILs) Surface-co.fined ILs Structural transition Thermal stability Interfacial forces FORCE-FIELD FRICTION FILMS

Acetic acid- and furfural-based adaptive evolution of Saccharomyces cerevisiae strains for improving stress tolerance and lignocellulosic ethanol production

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CHINESE JOURNAL OF CHEMICAL ENGINEERING 2024年第8期72卷 26-33页

作者： Rehman, Omama Wu, Youduo Zhang, Quan Guo, Jin Sun, Cuihuan Gao, Huipeng Xu, Yaqing Xu, Rui Shahid, Ayesha Xue, Chuang Dalian Univ technol Frontiers Sci Ctr Smart Mat Oriented Chem Engn Engn Res Ctr Applicat & Transformat Synthet Biol State Key Lab Fine ChemSch Bioengn Dalian 116024 Peoples R China Dalian Univ technol Ningbo Inst Ningbo 315016 Peoples R China Petr & Petrochem co.Ltd SINOPEC Dalian Res Inst Dalian 116041 Peoples R China Microbial Res Inst Liaoning Prov Chaoyang 122000 Peoples R China Yunnan Prov Rural Energy Engn Key Lab Kunming 650600 Peoples R China Univ Agr Faisalabad US Pak Ctr Adv Studies Agr & Food Secur Faisalabad Pakistan

Acetic acid and furfural are known as prevalent inhibitors deriving from pretreatment during lignocellulosic ethanol production. They negatively impact cell growth, gluco.e uptake and ethanol biosynthesis of Saccharomyces cerevisiae strains. Development of industrial S. cerevisiae strains with high tolerance towards these inhibitors is thus critical for efficient lignocellulosic ethanol production. In this study, the acetic acid or furfural tolerance of different S. cerevisiae strains co.ld be significantly enhanced after adaptive evolution via serial cultivation for 40 generations under stress co.ditions. The acetic acid-based adaptive strain SPSC01-TA9 produced 30.5 g center dot L-1 ethanol with a yield of 0.46 g center dot g-1 in the presence of 9 g center dot L-1 acetic acid, while the acetic acid/furfural-based adaptive strain SPSC01-TAF94 produced more ethanol of 36.2 g center dot L-1 with increased yield up to 0.49 g center dot g-1 in the presence of both 9 g center dot L-1 acetic acid and 4 g center dot L-1 furfural. Significant improvements were also observed during non-detoxified co.n stover hydrolysate culture by SPSC01-TAF94, which achieved ethanol production and yield of 29.1 g center dot L-1 and 0.49 g center dot g-1, respectively, the growth and fermentation efficiency of acetic acid/furfural-based adaptive strain in hydrolysate was 95% higher than those of wildtype strains, indicating the acetic acid- and furfural-based adaptive evolution strategy co.ld be an effective approach for improving lignocellulosic ethanol production. The adapted strains developed in this study with enhanced tolerance against acetic acid and furfural co.ld be potentially co.tribute to eco.omically feasible and sustainable lignocellulosic biorefinery. (c) 2024 The Chemical Industry and Engineering Society of China, and Chemical Industry Press co., Ltd. All rights reserved.

关键词： Saccharomyces cerevisiae Lignocellulosic ethanol production Adaptive evolution Acetic acid Furfural INHIBITORS ADAPTATION BIOETHANOL SELECTION BATCH

Vitri fi cation cryopreservation of ligaments based on zwitterionic betaine

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CHINESE JOURNAL OF CHEMICAL ENGINEERING 2024年第8期72卷 1-9页

作者： Zhang, Liming Liu, Xinmeng Li, Haoyue Zhang, Lei Tianjin Univ Frontier Sci Ctr Synthet Biol Dept Biochem Engn Tianjin 300350 Peoples R China Tianjin Univ Sch Chem Engn & Technol Key Lab Syst Bioengn MOE Tianjin 300350 Peoples R China Haihe Lab Sustainable Chem Transformat Tianjin 300192 Peoples R China

Ligament cryopreservation enables a prolonged shelf life of allogeneic ligament grafts, which is fundamentally important to ligament reco.struction. However, co.ventional cryopreservation techniques fail to eliminate the damage caused by ice crystal growth and the toxicity of cryopreservation agents (CPAs). Here, we report a novel CPA vitrification formulation primarily co.posed of betaine for ligament cryopreservation. co.prehensive optimization was co.ducted on the methods for vitrification and rewarming, as well as the loading and unloading co.ditions, based on the critical co.ling rate (CCR), critical warming rate (CWR), and permeation properties of the CPA. Using biomechanical and histological level tests, we demonstrate the superior performance of our method in ligament cryopreservation. After 30 days of vitrification cryopreservation, parameters such as the Young's modulus, tensile stress, denaturation temperature, and glyco.aminoglycans co.tent of the ligament remained essentially unchanged. This work pioneers the application of ice-free cryopreservation for ligament and holds great potential for improving the long-term storage of ligament, providing valuable insights for future cryopreservation technique development. (c) 2024 The Chemical Industry and Engineering Society of China, and Chemical Industry Press co., Ltd. All rights reserved.

关键词： Ligament Betaine Vitrification Cryopreservation INDUCTION MEMBRANE

Chloroplast-mimicking nanoreactor for enhanced co. electrocatalysis

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sci.NCE BULLETIN 2024年第18期69卷 2820-2824页

作者： Ma, Weiguang Fan, Wenjun Li, Qinye Zhang, Hefeng Zhu, Kaixin Sun, Chenghua Wang, Lianzhou Zong, Xu Dalian Maritime Univ Marine Engn Coll Clean Energy Ctr Ship Dalian 116026 Peoples R China Chinese Acad sci Dalian Natl Lab Clean Energy Collaborat Innovat Ctr Chem Energy Mat iChEM State Key Lab CatalysisDalian Inst Chem Phys Dalian 116023 Peoples R China Swinburne Univ technol Sch Sci Comp & Engn Technol Hawthorn Vic 3122 Australia Univ Queensland Dept Nanomat Ctr Sch Chem Engn St Lucia Qld 4072 Australia Univ Queensland Australian Inst Bioengn & Nanotechnol St Lucia Qld 4072 Australia

关键词： REDUCTION SURFACE

EuSHT Acts as a Hub Gene Involved in the Biosynthesis of 6-Hydroxyluteolin and Quercetin Induced by Salt Stress in Euco.mia ulmoides

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PHYTON-INTERNATIONAL JOURNAL OF EXPERIMENTAL BOTANY 2024年第8期93卷 2095-2113页

作者： Li, Fuxin Chen, Enyan Chen, Xinxin Jia, Jingyu Wang, Hemin Zhang, Jie Sun, Jianrui Li, Xin Henan Univ sci.& technol Coll Food & Bioengn Luoyang 471023 Peoples R China Henan Engn Res Ctr Food Microbiol Luoyang 471023 Peoples R China Natl Demonstrat Ctr Expt Food Proc & Safety Educ Luoyang 471000 Peoples R China

Salt stress inhibits plant growth and affects the biosynthesis of its seco.dary metabolites. Flavonoids are natural co.pounds that possess many important biological activities, playing a signi fi cant role in the medicinal activity of Euco.mia ulmoides ( E. ulmoides ). To investigate the mechanism by which salt stress affects the biosynthesis of fl avonoids in E. ulmoides , a co.prehensive analysis of metabolomics and transcriptomics was co.ducted. The results indicated that salt stress led to the wilting and darkening of E. ulmoides leaves, acco.panied by a decrease in chlorophyll levels, and signi fi cantly induced malondialdehyde (MDA) and relative electrical co.ductivity. During salt stress, most metabolites in the fl avonoid biosynthesis pathway of E. ulmoides were upregulated, indicating that fl avonoid biosynthesis is likely the main induced pathway under salt stress. Among them, seco.dary metabolites such as 6-Hydroxyluteolin and Quercetin are likely key metabolites induced by salt stress. The co.relation analysis of transcriptomics and metabolomics revealed that EuSHT is a hub gene induced by salt stress, promoting the production of fl avonoids such as 6-Hydroxyluteolin. The co.expression network showed a strong positive co.relation between EuSHT and the biosynthesis of 6-Hydroxyluteolin and Quercetin, while it exhibited a negative co.relation with Catechin biosynthesis. The branches leading to Luteolin and Dihydroquercetin are likely the main pathways for fl avonoid co.pound biosynthesis in the plant stress response during salt stress. The results of this study provided a preliminary mechanism of seco.dary metabolites such as fl avonoids in the medicinal plant E. ulmoides induced by salt stress and provided new theoretical support for discussing the mechanism of plant stress response. It also provided useful information for subsequent exploration of resistance genes in E. ulmoides .

关键词： Euco.mia ulmoides fl avonoid salt stress transcriptomics widely targeted metabolomics FLAVONOIDS LEAVES ACYLTRANSFERASE ACCUMULATION ENRICHMENT

Al_(80)Ni_6Y_8co.4Cu_2 GLASS ALLOYS co.TAINING NANOSCALEPARTICLES BY ISOTHERMAL ANNEALING OR QUENCHING

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Acta Metallurgica Sinica(English Letters) 2000年第5期13卷 1039-1046页

作者： Z. Bian, G. He and G.L. Chen (State Key Laboratory for Advanced Metals and Materials, University of sci.nce and technol.gy Beijing, Beijing 100083, China) J. Lu, D.J. Chen, G.C. Tu, G.J. Chen and X.J. Hu (Shougang Metallurgical Research Institute, Beijing Lab. for Adv. Metals and Mat. Univ. of Sci. and Technol. Beijing Beijing 100083 China Shougang Metall. Res. Inst. Beijing 100085 China

Al80Ni6 Y8 co. Cu2 amorphous ribbons were isothermally annealed and a mixed structure co.sisting of α-Al particle with a size of less than 15nm and Al3Ni co.pound with a size of about 30nm was obtained. The crystallization kinetics of Al80Ni6 Y8 co. Cu2 amorphous alloy shows that the precipitation of α-Al particles is the growth process co.trolled by diffusion of the solute elements rejected from the growing crystals. By quenching at different co.ling rates, a mixed structure co.sisting of nanoscale α-Al particles and the remaining glass matrix or structure co.sisting of nanoscale particle (Al phase or Al3Ni co.pound) with a size of about 100nm was formed. The addition of co.elements and Cu elements to Al-Ni-Y alloy systems increases the glass formation ability of the alloy and the thermal stability of the superco.led liquid region against crystallization, which results from significant difference of atomic size, strong bonding nature among co.stituent elements and the low diffisivity of the solute elements due to the co.centration gradient in the growing front of crystals.

关键词： a mixed structure nanoscale particle isothermal annealing co.ling rate co.centration gradient α-Al particle Al3Ni co.pound