CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Xinru Tan,Maolin Zhang,Dongyan Zhang,Yangxi Yan,Yuan Wang,Zhimin Li
The formation of micro-cracks in Ni-rich LiNi 0.8 Co 0.1 Mn 0.1 O 2 (NCM811) cathode particles is an extremely important factor affecting the electrochemical characteristics after long-term cycling. Generally, cracks can be divided into intergranular crack and intracrystalline crack according to their positions. Coating has been confirmed as a highly effective strategy to relieve intergranular cracks. However, the intracrystalline cracks of primary-like particles have rarely been studied. In this work, ethoxy functional polysiloxane (EPS) was directly coated on the surface of original NCM811 by tetraethyl orthosilicate (TEOS) hydrolytic polycondensation method without any additives. Then, the microstructure, micromorphology, surface state and electrochemical properties were investigated in detail by XRD , SEM, TEM, CV and EIS . The results displayed that the micro-cracks of primary-like particles were effectively suppressed under appropriate EPS coating. Accordingly, excellent capacity retention of 95.6% (100 cycles, 1C) and rate performance (144.6 mA h/g, 5C) were obtained. These improved mechanical and electrochemical properties are considered to be related to the EPS stress buffer layer , suppressed oxygen vacancies , inhibited phase transition and reduced volume change.
研究领域:
材料科学
·
电化学
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DOI
高影响因子
Oncotarget
·
2017
·
IF 5.168
Lu Yang,Yuling Wei,Ying Luo,Qunfang Yang,Huan Li,Congli Hu,Yang Yang,Junqing Yang
To observe the characteristic changes of PGE 2 -EP s pathway and divergent functions of PGE 2 receptor subtypes on neuronal injury. The primary cultured rat hippocampus neuron injury model was established via aluminum maltolate (100 μM). The aluminum-overload neurons were treated with the agonists of EP1 (17-phenyl trinor Prostaglandin E2 ethyl amide), EP2 (Butaprost), EP3 (Sulprostone) and EP4 (CAY10598) and antagonists of EP1 (SC-19220), EP2 (AH6809) and EP4 (L-161982) at different concentrations, respectively. The neuronal viability, lactate dehydrogenase leakage rate and PGE2 content were detected by MTT assay, lactate dehydrogenase assay kit and enzyme-linked immunosorbent assay, respectively. The mRNA and protein expressions of mPGES-1 and EPs were determined by RT-PCR and western blot, respectively. The pathomorphology was identified by hematoxylin-eosin staining. In the model group, neuronal viability significantly decreased, while lactate dehydrogenase leakage rate and PGE2 content increased. The mPGES-1, EP1, EP2 and EP4 mRNA expression, and the mPGES-1, EP1 and EP2 protein expression increased, while EP 3 level decreased. EP3 agonist exerted protective function in neuronal viability and lactate dehydrogenase leakage rate, while EP1 agonist, EP2 and EP4 antagonist exerted an opposite effect. In conclusion, aluminum-overload caused an imbalance of PGE 2 -EP 1-4 pathway and activation of EP receptor may provide a viable therapeutic target in neuronal injury.
研究领域:
神经科学
·
药理学
·
毒理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Peng Zhang,Xiao-Yan Xu,Xue-Lin Zhang,Kui Zou,Bing-Zhi Liu,Tai-Ping Qing,Bo Feng
Microbial extracellular polymeric substances (EPS) coating nanoparticles (NPs) surface can form NPs-EPS corona, which significantly affect the adsorption of NPs to toxic substances and alter the ecotoxicological effect of NPs. In this work, the EPS coronas on TiO 2 NPs (TNPs) and CeO 2 NPs (CNPs) were characterized and the adsorption characteristics of NPs with and without EPS corona to five heavy metals were investigated in single-metal and multiple-metal systems. The results of spectral analysis showed that NPs-EPS corona exhibited new crystalline phases and abundant functional groups. Moreover, 42 and 13 proteins were identified in the TNPs-EPS and CNPs-EPS coronas, respectively. The rates of Cd 2+ , Pb 2+ , Cu 2+ , Ni 2+ and Ag + adsorption by NPs-EPS corona increased to values that were 6.7˗7.6, 4.4˗5.1, 4.2˗5.5, 3.9˗4.9 and 8.5˗8.8 times those of NPs without EPS corona, respectively, in single-metal system. NPs-EPS coronas are effective in absorbing Ag + , Pb 2+ and Cu 2+ compared with Cd 2+ and Ni 2+ in multiple metal adsorption. These results indicated that NPs-EPS corona effectively adsorb and remove heavy metals by forming NPs-EPS-metal complexes and inducing precipitation. However, NPs-EPS corona can enhance the toxicity of NPs by accumulating highly-toxic heavy metals in aquatic environments.
研究领域:
环境科学
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纳米技术
·
毒理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Xiaodong Jin,Xinyi Wu,Wufei Tang,Zheni Tan,Wanfu Wang,Shibing Sun
Layer by layer (LBL) self-assembly coatings upon expandable polystyrene (EPS) surface play an important role in improving its flame retardancy. However, a large number of layers is needed to achieve a satisfied fire performance, and the coatings are difficult to adhere on the inert EPS surface, resulting in the poor durability. In this work, the surface of EPS was activated by ultraviolet ozone (UVO) with the appearance of oxygen contained groups, then a LBL coating with only two bilayers (branched polyethyleneimine (BPEI)-kaolinite (kaol)-BPEI-diethylene triamine penta (methylene phosphonic acid)) was covalently connected on the EPS surface. Compared with neat EPS, the obtained E-K 5 D 30 sample increased the value of limiting oxygen index (LOI) from 18.8 % to 37.7 %, improved the ignition time from 59 s to 95 s, reduced the peak heat release rate (pHRR) value from 282.0 kW/m 2 to 220.9 kW/m 2 , and enhanced the char residues from 6.3 % to 32.3 % after the combustion. Moreover, an ultraviolet (UV) curing layer with P/N elements was prepared upon E-K 5 D 30 sample to maximize the flame retardant durability. A novel amino-intercalated kaol was used to play a smoke suppression role. The results showed that E-K* 5 D 30 -P 8 N 3 sample further increased the LOI to 39.2 %. Even after 12 h washing, the E-K* 5 D 30 -P 8 N 3 sample exhibited a slight LOI reduction to 37.8 %, and fire performance index (FPI) value of 0.405 m 2 ·s/kW, showing the successful construction of coatings with good fire safety and flame retardant durability.
研究领域:
材料科学
·
聚合物化学
·
消防安全工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2025
·
IF 11.3
Jingye Cui,Huan He,Wanqi Shi,Zhicheng Liao,Danni Cui,Jianxiang Yang,Yixin Liu,Chaochao Lai,Bin Huang,Xuejun Pan
Microbial-derived extracellular polymeric substances (EPS) and iron minerals are ubiquitous in aquatic environments, and they can influence the fate of organic micropollutants such as 17α-ethinylestradiol (EE2). However, the interactions between EPS and iron minerals, and their influence on EE2 photodegradation, are seldom addressed in the literature. This study explored the effects of EPS derived from different aerobic or anaerobic microbials on the reductive dissolution of ferrihydrite (Fhy) and subsequent EE2 photodegradation, with emphasis on the impact of Fe-EPS complexes formation. In the dark, EPS could promote the reductive dissolution of Fhy via ligand-metal charge transfer, accompanied by Fe(III)-EPS complexes formation. Irradiation could further enhance such a dissolution process. Dissolved iron could accelerate the photolysis of protein and humic substances, triggering Maillard-like reactions that form the unsaturated medium- or high-molecular-weight polymers. The aerobic-EPS containing more proteins and humic substances photodegraded EE2 more effectively than anaerobic-EPS, with the triplet excited state playing a crucial role. In contrast, Fhy inhibited EPS-mediated EE2 photodegradation via light-shielding effect or photosensitizers oxidative decomposition. The information obtained in this research would contribute to the understanding of photochemistry involving EPS, iron minerals, and steroid estrogens, providing new insights into their environmental behavior.
研究领域:
环境化学
·
光化学
·
环境科学
·
微生物学
·
地球化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
WATER RESEARCH
·
2023
·
IF 12.8
Jinlan Yu,Kang Xiao,Hao Xu,Yitong Li,Qiao Xue,Wenchao Xue,Aiqian Zhang,Xianghua Wen,Guoren Xu,Xia Huang
Extracellular polymeric substances (EPS), with a stratified structure including tightly-bound EPS (TB-EPS), loosely-bound EPS (LB-EPS), and soluble EPS (S-EPS) surrounding the microbial cells, are known to vitally affect the physicochemical and biological functions of activated sludge in wastewater treatment. Polysaccharides (PS), proteins (PN), and humic acids (HA) are key components of EPS but their roles in constructing the multi-layer architecture are still unclear. This study explored the EPS characteristics in relation to the components using spectroscopic fingerprinting techniques. Ultraviolet-visible (UV-vis) spectra demonstrated stark difference between TB-EPS and other EPS. Fluorescence excitation-emission matrix (FEEM) and apparent quantum yield revealed further detailed differences. Fluorescence quotient analysis highlighted the dominance of TB-EPS, LB-EPS, and S-EPS in the excitation/emission wavelength (Ex/Em) region of Em = 350–400 nm, Em > 400 nm, and low-Stokes shift band (Em − Ex < 25 nm), respectively. Wavelength-wise prediction of the FEEM intensity was achieved through multiple linear regression against the chemical composition and variance partitioning analysis witnessed binary interactions of PS×HA and PS×PN in S-EPS, PN×HA and PS×PN in LB-EPS, and ternary interaction of PS×PN×HA in TB-EPS as well as the wavelength-specific fluorescence responses of these interactions. Further, X-ray photoelectron spectroscopy, infrared spectra, and circular dichroism spectra corroborated the differences in primary, secondary, and tertiary structures across the EPS layers. Ultrahigh-performance liquid chromatography-mass spectrometry detected molecular fragments confirming the multi-component hybridization among PS , PN, and HA . This study demonstrates a spectroscopic approach to sensitively fingerprint the fine structure of EPS, which has the potential for rapid monitoring of EPS and related sludge properties in wastewater treatment systems.
研究领域:
环境科学
·
废水处理
·
分析化学
·
微生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMOSPHERE
·
2018
·
IF 4.427
Guangxia Liu,Hongjie Sheng,Yuhao Fu,Yang Song,Marc Redmile-Gordon,Yan Qiao,Chenggang Gu,Leilei Xiang,Fang Wang
Extracellular polymeric substances (EPS), chars and persistent organic pollutants (POPs) frequently coexist in the environment. However, a knowledge gap exists regarding their interactions. Therefore, we applied 2,2′,4,4′-tetrabromodiphenyl ether (BDE-47) as a model POP to investigate the influence of bovine serum albumin (BSA) and sodium alginate (SA) - representing protein and polysaccharide components of EPS - on POP adsorption to biochars. Surface activities of tested biochars were characterised using nuclear magnetic resonance, X-ray photoelectron spectroscopy and Fourier transform infrared spectroscopy . The adsorption capacities of BDE-47 on biochars were significantly improved by both EPS analogues: BSA at concentrations of only 5 mg L −1 and SA at 80 mg L −1 at c e = 1 S w BDE-47 concentration. However, 80 mg L −1 BSA decreased the BDE-47 adsorption capacities on biochars at the tested BDE-47 concentrations. Chemisorption and pore filling mechanisms appeared to dominate the adsorption process of BDE-47 on maize straw and wheat straw biochars. After adding BSA (or SA), a hydrophobic partition effect was found to best explain the adsorption process and linearity of adsorption was enhanced. These results progress our understanding of bioavailability and migration of POPs: especially relevant to the water industry and biochar/EPS facilitated removal of these contaminants.
研究领域:
环境科学
·
化学
·
材料科学
·
污染控制
·
水处理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2021
·
IF 6.953
Feiwei Cao,Mingming Liang,Jianxin Liu,Yu Liu,John A. Renye,Phoebe X. Qi,Daxi Ren
Yak yogurt, one of the naturally fermented dairy products prepared by local herdsmen in the Qinghai-Tibet Plateau, contains a diverse array of microorganisms. We isolated and identified a novel Streptococcus thermophilus strain, ZJUIDS-2-01, from the traditional yak yogurt. We further purified and carried out detailed structural, physiochemical, and bioactivity studies of an exopolysaccharide (EPS-3A) produced by S. thermophilus ZJUIDS-2-01. The weight-average molecular weight (Mw) of EPS-3A was estimated to be 1.38 × 10 6 Da by High-Performance Gel Permeation Chromatography (HPGPC). The monosaccharide analysis established its composition to be glucose, galactose, N -acetyl-D-galactosamine, and rhamnose in a ratio of 5.2:2.5:6.4:1.0. The molecular structure of EPS-3A was determined by the combination of permethylation analysis, FT-IR, and NMR spectroscopic techniques. The ζ-potential measurements indicated that EPS-3A had a p K a value of ~4.40. The DSC yielded a melting point (T m ) of 80.4 °C and enthalpy change (ΔH) of 578 J/g for EPS-3A, comparable to those of the xanthan gum (XG), a commercial EPS. EPS-3A exhibited better O/W emulsion stability and flocculating capacity than XG. Furthermore, it also demonstrated similar antioxidant activity to XG and promising in vitro antibacterial properties. This work evidenced that EPS-3A derived from S. thermophilus ZJUIDS-2-01 holds the potential for food and industrial applications.
研究领域:
食品科学
·
微生物学
·
生物化学
·
生物技术
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产品关联
DOI
PubMed
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2018
·
IF 4.61
Jinfeng Zhao,Shixiang Liu,Na Liu,Han Zhang,Qiongzhi Zhou,Fei Ge
Extracellular polymeric substances (EPS) play significant roles in protecting cells against environmental stresses. However, little information is known about the roles of different EPS in these processes. In this study, the productions and physicochemical characterizations of soluble-EPS (S-EPS) and bound-EPS (B-EPS), the two different fractions of EPS from a green alga Chlorella vulgaris under the stress of ZnO nanoparticle (nano-ZnO) were investigated. The contents of S-EPS and B-EPS which described as dissolved organic carbon , polysaccharides and proteins, both increased with the addition of tested nano-ZnO (0.01 and 0.04 mM) in a 72 h cultivation. EPS-Free (EPS-F) cells produced more S-EPS and B-EPS than the EPS-Cover (EPS-C) cells did with the tested nano-ZnO, especially the contents of protein in the S-EPS of EPS-F cells increased by 45.5% with 0.04 mM nano-ZnO compared to the control at 72 h. Tryptophan-like substances of the protein in S-EPS exhibited a stronger chemical static quenching than tyrosine-like substances with nano-ZnO. In addition, the hydroxyl ( OH) as well as carboxyl (C O) group, and C O of amide I, N H/C N of amide II groups in proteins were confirmed that involved in the reaction of S-EPS and B-EPS with nano-ZnO, meanwhile hemiacetal groups in saccharides were oxidized to carboxyl groups. This study could provide a better understanding of EPS in protecting against cells damage with nanoparticles.
研究领域:
环境科学
·
微生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMOSPHERE
·
2021
·
IF 7.086
Lingxiao Fu,Xiaofeng Wu,Yongbin Zhu,Lei Yao,Chengqiang Wu,Haixiang Cheng,Yiran Xu,Jun Hu,Weijun Gao
Manganese dioxide (MnO 2 ) is a Mn deposit widely accumulated in the corrosion layer of pipelines, and iodide (I − ) is a halogen ion frequently detected in waters. The biofilm dwelling on the corrosion scales often secretes extracellular polymeric substances (EPS) into drinking water . The paper aimed to study the I − oxidation by MnO 2 and iodinated disinfection byproducts (I-DBPs) formation with biofilm EPS as a precursor. More than 93% of formed free iodine was finally converted into organic iodine in the MnO 2 /I − /EPS system. Compared with humic acid , EPS had a lower carbonaceous I-DBPs (C-IDBPs) formation while a higher nitrogenous I-DBPs (N-IDBPs) formation. The formation of iodomethanes (I-THMs), iodoacetonitriles (I-HANs) and iodoacetic acids (I-HAAs) decreased with the increase of pH due to the weakening of polarization effect and redox potential , while the iodoacetamides (I-HAcAms) formation achieved the maximum at pH 6.0 due to the difference between the hydrolysis rate of I-HANs and decomposition rate of I-HAcAms. The I-DBPs formation was positively correlated with I − concentration, while negatively correlated with MnO 2 dose. Protein components displayed a higher formation of N-IDBPs and C-IDBPs than polysaccharide components due to higher nitrogen proportion and more iodination sites. Among 20 protein monomers , aspartic acid was considered as the most important precursor of the four investigated I-DBPs species. The paper is helpful to understand the I-DBPs formation when I − in the bulk water come into contact with Mn deposits attached by biofilm.
研究领域:
环境科学
·
水处理
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Scientific Reports
·
2016
·Vol. 6
·期 1
·1-7
·
IF 5.228
Li Shan-Wei,Sheng Guo-Ping,Cheng Yuan-Yuan,Yu Han-Qing
Although the capacity for electroactive bacteria to convert environmental metallic minerals and organic pollutants is well known, the role of the redox properties of microbial extracellular polymeric substances (EPS) in this process is poorly understood. In this work, the redox properties of EPS from two widely present electroactive bacterial strains ( Shewanella oneidensis and Pseudomonas putida ) were explored. Electrochemical analysis demonstrates that the EPS extracted from the two strains exhibited redox properties. Spectroelectrochemical and protein electrophoresis analyses indicate that the extracted EPS from S. oneidensis and P. putida contained heme-binding proteins, which were identified as the possible redox components in the EPS. The results of heme-mediated behavior of EPS may provide an insight into the important roles of EPS in electroactive bacteria to maximize their redox capability for biogeochemical cycling, environmental bioremediation and wastewater treatment.
研究领域:
微生物学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL RESEARCH
·
2025
·
IF 7.7
Junxin Jia,Yaqi Jiao,Jiaying Gu,Tianyuan Zhang,Qin Zhou,Hui Li,Sa Wang,Hongliang Guo,Hongtao Shi,Li Li
Phenanthrene (PHE) serves as a representative polycyclic aromatic hydrocarbon (PAH) that poses a significant risk to ecosystems and human health owing to its persistence and biotoxicity. A novel bio-mineral system was developed by integrating natural birnessite with the PHE-degrading strain Novosphingobium sp. HDJX-2 to address the need for effective remediation, which achieved the complete degradation of PHE within 72 h. The mechanistic analysis demonstrated that the enhanced degradation efficiency resulted from multidimensional synergism between minerals and microbes. The metabolic activity of HDJX-2 modified the microstructure of birnessite and increased its active sites, whereas birnessite simultaneously stimulated cellular activity and markedly promoted the secretion of bound extracellular polymeric substances (B-EPS). Additionally, birnessite induced the expression of more hydrophobic proteins, thereby enhancing the recognition and binding capacity of EPS for hydrophobic PHE molecules. This structural modification was accompanied by increased glucose (Glc) and glucosamine (GalN) contents, which reduced microbial aggregation and improved cell dispersion, facilitating pollutant accessibility and metabolism. Furthermore, the phenolic compounds in EPS were involved in synergistic coupling with birnessite. This contributed to the formation of high-molecular-weight, highly aromatic, and highly unsaturated polymeric products, further enhancing the PHE adsorption, enrichment, and catalytic degradation. This study offers theoretical support and practical framework for the development of efficient and sustainable PAH remediation strategies.
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）