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Role of alloyed Al on the microstructure and corrosion behavior of as-cast dilute Mg-2Zn-xAl-0.5ca alloys

cORROSION ScIENcE 2023年 211卷

作者： Li, Yi-Jia Li, Mei-Xuan Hua, Zhen-Ming Wang, Bing-Yu Gao, Yipeng Wang, Hui-Yuan Jilin Univ Key Lab Automobile Mat Minist Educ Nanling Campus5988 Renmin St Changchun 130025 Peoples R China Jilin Univ Sch Mat Sci & Engn Nanling Campus5988 Renmin St Changchun 130025 Peoples R China Jilin Univ Int Ctr Future Sci Changchun 130012 Peoples R China

Effect of Al on microstructure and corrosion behaviors of cast Mg-2Zn-xAl-0.5ca (x = 0, 0.5, 1.0, 2.0 wt%) alloys is investigated. The 0.5Al specimen shows the lowest corrosion rate (4 mm/y) because appropriate Al doping into ca2Mg6Zn3 decreases cathodic activity of this phase and Al alloying significantly refines intermetallics, both of which contribute to reducing pitting corrosion. Moreover, finer grains enhance barrier effect of continuous netlike phases at grain boundaries, effectively confining the corrosion propagation. The formation of Al2O3 reinforces the surface film. Optimum Al content is determined as 0.5-1.0%, which endows alloy with admirable corrosion resistance and high ultimate tensile strength.

关键词： A Magnesium Alloy Intermetallics B SEM Weight loss c Pitting corrosion

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Kinetic and thermodynamic studies of novel acid phosphatase isolated and purified from carthamus oxyacantha seedlings

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INTERNATIONAL JOURNAL OF BIOLOGIcAL MAcROMOLEcULES 2023年 224卷 20-31页

作者： Zaman, Umber Khan, Shahid Ullah Hendi, Awatif A. Rehman, Khalil Ur Badshah, Syed Refat, Moamen S. Alsuhaibani, Amnah Mohammed Ullah, Kalim Wahab, Abdul Gomal Univ Inst Chem Sci Dera Ismail Khan Pakistan Khyber Med Univ KPK Women Med & Dent Coll Dept Biochem Peshawar Pakistan Natl Key Lab Crops Genet & Improvement Wuhan Peoples R China Princess Nourah bint Abdulrahman Univ Coll Sci Dept Phys POB 84428 Riyadh 11671 Saudi Arabia Taif Univ Coll Sci Dept Chem POB 11099 Taif 21944 Saudi Arabia Princess Nourah bint Abdulrahman Univ Coll Educ Dept Phys Sport Sci POB 84428 Riyadh 11671 Saudi Arabia Kohat Univ Sci & Technol Dept Zool Kohat Khyber Pakhtunk Pakistan Kohat Univ Sci & Technol Dept Pharm Kohat Khyber Pakhtunk Pakistan

Acid phosphatase (AcP) is a key enzyme in the regulation of phosphate feeding in plants. In this study, a new AcP from c. oxyacantha was isolated to homogeneity and biochemically described for the first time. Specific activity (283 nkat/mg) was found after 2573 times purification fold and (17 %) yield. Using SDS-PAGE under denaturing and nondenaturing conditions, AcP was isolated as a monomer with a molecular weight of 36 kDa. Lc-MS/MS confirmed the presence of this band, suggesting that c. oxycantha AcP is a monomer. The enzyme could also hydrolyze orthophosphate monoester with an optimal pH of 5.0 and a temperature of 50 degrees c. Ther-modynamic parameters were also determined (Ea, Delta H degrees, Delta G degrees, and Delta S degrees). AcP activity was further studied in the presence of cysteine, DTT, SDS, EDTA, beta-ME, Triton-X-100 H2O2, and PMSF. The enzyme had a Km of 0.167 mM and an Ea of 9 kcal/mol for p-nitrophenyl phosphate. The biochemical properties of the c. oxyacantha enzyme distinguish it from other plant acid phosphatases and give a basic understanding of AcP in c. oxyacantha. The results of this investigation also advance our knowledge about the biochemical significance of AcP in c. oxyacantha. Thermal stability over a wide pH and temperature range make it more suitable for use in harsh industrial environments. However, further structural and physiological studies are anticipated to completely comprehend its important aspects in oxyacantha species.

关键词： Isolation Purification Acid phosphatase c oxyacantha Seeds

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combinational exposure to hydroxyatrazine increases neurotoxicity of polystyrene nanoparticles on caenorhabditis elegans

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ScIENcE OF THE TOTAL ENVIRONMENT 2023年 880卷 163283页

作者： Wang, Yuxing Yuan, Xiaoan Zhou, Rong Bu, Yuanqing Wang, Dayong Southeast Univ Med Sch Key Lab Environm Med Engn Minist Educ Nanjing Peoples R China Nanjing Inst Environm Sci Minist Ecol & Environm Nanjing Peoples R China Shenzhen Ruipuxun Acad Stem Cell & Regenerat Med Shenzhen Peoples R China

Using caenorhabditis elegans as an animal model, we investigated combinational effect between 2-hydroxyatrazine (HA) and polystyrene nanoparticle (PS-NP) on function and development of D-type motor neurons. Exposure to HA (10 and 100 mu g/L) alone caused decreases in body bend, head thrash, and forward turn and increase in backward turn. Exposure to 100 mu g/L HA also caused neurodegeneration of D-type motor neurons. Moreover, combinational exposure to HA (0.1 and 1 mu g/L) induced enhancement in PS-NP (10 mu g/L) toxicity in inhibiting body bend, head thrash, and forward turn, and in increasing backward turn. In addition, combinational exposure to HA (1 mu g/L) could result in neurodegeneration of D-type motor neurons in PS-NP (10 mu g/L) exposed nematodes. combinational exposure to HA (1 mu g/L) and PS-NP (10 mu g/L) increased expressions of crt-1, itr-1, mec-4, asp-3, and asp-4, which govern the induction of neurodegeneration. Moreover, combinational exposure to HA (0.1 and 1 mu g/L) strengthened PS-NP (10 mu g/L)-induced decreases in glb-10, mpk-1, jnk-1, and daf-7 expressions, which encode neuronal signals regulating response to PS-NP. Therefore, our results demonstrated the effect of combinational exposure to HA and nanoplastics at environmentally relevant concentrations in causing toxic effect on nervous system in organisms.

关键词： c elegans combinational exposure Nanoplastic Hydroxyatrazine

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Principles for quorum sensing-based exogeneous denitrifier enhancement of nitrogen removal in biofilm: a review

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cRITIcAL REVIEWS IN ENVIRONMENTAL ScIENcE AND TEcHNOLOGY 2023年第14期53卷 1404-1429页

作者： Zhu, Ying-nan Wang, Jinfeng Liu, Qiuju Jin, Ying Ding, Lili Ren, Hongqiang Nanjing Univ Sch Environm State Key Lab Pollut Control & Resource Reuse Nanjing Peoples R China

Denitrifying bacteria play critical roles in enhancing biological biofilm denitrification for nitrogen removal in industrial and municipal wastewater treatment and groundwater remediation. Evidence intensively confirms that exogenous quorum sensing (QS) bacteria prompt biofilm formation and denitrification. Yet, exogenous bacteria forfeiting during bioaugmentation may occur despite of its priority effect and improved community function, because of open, intricate traits in wastewater treatment system. critical topics include regulating signal-based microecological structure, effectively assembling 3D biofilm, and regulating carbon and nitrogen metabolization of denitrifiers to reduce cO2 and N2O emissions. This review demonstrates classifications of denitrifiers and the vital role of QS in regulating biofilm denitrification. Furthermore, the ecological principles of microbial community construction with the addition of exogenous denitrifiers are summarized. Moreover, the effects of signaling molecules on carbon and nitrogen transcription and metabolization are discussed. In conclusion, technologies based on quorum sensing for enhanced denitrification have high application potential and challenges. Herein, we provide a guideline for enhancing nitrogen removal by exogenous quorum-sensing bacteria and synthetic biofilms design during upgrading of municipal wastewater treatment plants.

关键词： Quorum sensing (QS) AHLs denitrifying bacteria regulation of carbon and nitrogen metabolism c N Eakalak Khan and Lena Q Ma

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The influence of Au2O3 on insulating character of ZnO-P2O5-SeO2 glass system: investigation by means of dielectric studies

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APPLIED PHYSIcS A-MATERIALS ScIENcE & PROcESSING 2023年第3期129卷 1-16页

作者： Reddy, G. Naga Koti Sekhar, A. Venkata Pavic, L. Bafti, A. Pisk, Jana Reddy, A. Siva Sesha Venkatramaiah, N. Raju, G. Naga Kumar, V. Ravi Veeraiah, N. Acharya Nagarjuna Univ Dept Phys Guntur 522510 India Rudjer Boskovic Inst Zagreb 10000 Croatia Univ Zagreb Fac Chem Engn & Technol Zagreb 10000 Croatia Univ Zagreb Fac Sci Dept Chem Zagreb 10000 Croatia Krishna Univ Dept Phys Machilipatnam 521004 Andhra Pradesh India SRM Inst Sci & Technol Dept Chem Chennai India Andhra Loyola Coll Autonomous Dept Phys Vijayawada Andhra Pradesh India

Zinc selenium phosphate glasses added with the traces of Au2O3 were prepared and heat-treated. XRD, TEM, DSc, FT-IR and optical absorption (OA) spectroscopy methods were used for the structural assessment of these samples. Later, different dielectric parameters viz., dielectric constant (epsilon '), electric moduli (M), impedance (Z) and a.c. conductivity (sigma(ac)) were measured over wide regions of frequency (omega) and temperature (T) as functions of Au2O3 concentration. Dielectric breakdown strength (DBS) of these samples was also measured at ambient conditions. The characterization studies indicated that multiple crystal grains were entrenched in the residual amorphous phase of the samples. The X-ray diffraction studies revealed that the bulk glasses consisted of Au-2(SeO3)(3) crystal phase and Au-0 metallic particles (MPs). As Au2O3 content was raised, the intensity of the XRD peak related to Au3+ crystal phase indicated a growing trend, whereas that of Au-0 MPs showed a decreasing trend. The results of XPS studies revealed similar inferences. The FT-IR results pointed out an improved degree of augmentation of the glass network as the content of Au2O3 was increased. Optical absorption (OA) - spectra of the glasses indicated a broad absorption band in the spectral range of 500-600 nm due to the surface plasmon resonance (SPR) of Au-0 MPs. The intensity of the band was observed to decrease as Au2O3 content was increased and indicated decreasing proportion of Au-0 metallic particles in the samples. The dielectric parameters exhibited a decreasing trend, whereas the dielectric breakdown strength (DBS) and electrical impedance indicated a substantial hike due to the increasing concentration of Au2O3. Overall, the presence of Au2O3 caused a significant improvement in the insulating strength of the ZnO added SeO2-P2O5 glasses and hence such glasses may be considered as insulating layers in the display panel devices.

关键词： ZnO-P2O5-SeO2 glasses Au ions Dielectric studies A c conductivity Dielectric breakdown strength

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corrosion Behavior of Mg-Zn-RE Alloys (RE = Gd, Y, Nd)

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JOURNAL OF MATERIALS ENGINEERING AND PERFORMANcE 2023年第6期32卷 2840-2852页

作者： Kumar, Arun S. Rajesh, K. R. Jayaraj, Jithu Raghu, K. G. Srinivasan, A. CSIR Natl Inst Interdisciplinary Sci & Technol Thiruvananthapuram 695019 Kerala India Acad Sci & Innovat Res AcSIR Ghaziabad 201002 India

The effect of different rare earth elements (Gd, Y, Nd) with similar atomic percentage on the corrosion behavior of Mg-1.52Zn (at.%) was investigated. The secondary phases and corrosion film formed on the surface of the alloys during immersion in aqueous Nacl solution affects the corrosion behavior of the alloy. The electrochemical, weight loss and hydrogen evolution tests revealed that corrosion rate of Mg-1.52Zn-0.15Gd was the highest and the corrosion rate of other three alloys were almost similar. The discrete second phases in Mg-1.52Zn-0.15Gd acted as severe cathodes to the matrix and accelerated the micro-galvanic corrosion whereas network shaped and uniformly distributed phases in Mg-1.52Zn-0.15Nd alloy effectively retarded corrosion. The immediate formation of Nd2O3 in the corrosion film of Mg-1.52Zn-0.15Nd alloy also contributed in improved corrosion resistance. Dominant presence of Y2O3 in Mg-1.52Zn-0.16Yalloy contributed to its better corrosion resistance.

关键词： B magnesium c rare earths corrosion

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Dissecting Physical and Biochemical Effects in Nanotopographical Regulation of cell Behavior

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AcS NANO 2023年第3期17卷 2124-2133页

作者： Wang, Kai Man, Kun Liu, Jiafeng Meckes, Brian Yang, Yong Univ North Texas Dept Biomed Engn Denton TX 76207 USA Schoen Adams Res Inst Spaulding Discovery Ctr Musculoskeletal Recovery Charlestown MA 02129 USA Harvard Med Sch Dept Phys Med & Rehabil Boston MA 02115 USA

Regulating cell behavior using nanotopography has been widely implemented. To facilitate cell adhesion, physical nanotopography is usually coated with adhesive proteins such as fibronectin (FN). However, the confounding effects of physical and biochemical cues of nanotopography hinder the understanding of nanotopography in regulating cell behavior, which ultimately limits the biomedical applications of nanotopography. To delineate the roles of the physical and biochemical cues in cell regulation, we fabricate substrates that have either the same physical nanotopography but different biochemical (FN) nanopatterns or identical FN nanopatterns but different physical nanotopographies. We then examine the influences of physical and biochemical cues of nanotopography on spreading, nuclear deformation, mechanotransduction, and function of human mesenchymal stem cells (hMScs). Our results reveal that physical topographies, especially nanogratings, dominantly control cell spreading, YAP localization, proliferation, and differentiation of hMScs. However, biochemical FN nanopatterns affect hMSc elongation, YAP intracellular localization, and lamin a/c (LAMAc) expression. Furthermore, we find that physical nanogratings induce nanoscale curvature of nuclei at the basal side, which attenuates the osteogenic differentiation of hMScs. collectively, our study highlights the dominant effect of physical nanotopography in regulating stem cell functions, while suggesting that fine-tuning of cell behavior can be achieved through altering the presentation of biochemical cues on substrate surfaces.

关键词： nanotopography adhesive proteins contact printing stem cells nuclear curvature lamin A c

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Biogas production from anaerobic co-digestion using kitchen waste and poultry manure as substrate-part 1: substrate ratio and effect of temperature

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BIOMASS cONVERSION AND BIOREFINERY 2023年第8期13卷 6635-6645页

作者： Rahman, Md Anisur Shahazi, Razu Nova, Syada Noureen Basher Uddin, M. Rakib Hossain, Md Shahadat Yousuf, Abu Shahjalal Univ Sci & Technol Dept Chem Engn & Polymer Sci Sylhet 3114 Bangladesh Univ Napoli Parthenope Dept Engn I-80143 Naples Italy

The rapidly declining fossil fuels are no longer able to meet the ever-increasing energy demand. Moreover, they are considered responsible for greenhouse gas (GHG) emission, contributing to the global warming. On the other hand, organic wastes, such as kitchen waste (KW) and poultry manure (PM), represent considerable pollution threat to the environment, if not properly managed. Therefore, anaerobic co-digestion of KW and PM could be a sustainable way of producing clean and renewable energy in the form of biogas while minimizing environmental impact. In this study, the anaerobic co-digestion of KW with PM was studied to assess the rate of cumulative biogas (cBG) production and methane percentage in four digester setups (D1, D2, D3, and D4) operated in batch mode. Each digester setup consisted of five parallelly connected laboratory-scale digesters having a capacity of 1 L each. The digester setups were fed with KW and PM at ratios of 1:0 (D1), 1:1 (D2), 2:1 (D3), and 3:1 (D4) at a constant loading rate of 300 mg/L with 50 gm cow manure (cM) as inoculum and were studied at both room temperature (28 degrees c) and mesophilic temperature (37 degrees c) over 24 days. The co-digestion of KW with PM demonstrated a synergistic effect which was evidenced by a 16% and 74% increase in cBG production and methane content, respectively, in D2 over D1. The D3 with 66.7% KW and 33.3% PM produced the highest cBG and methane percentage (396 +/- 8 mL and 36%) at room temperature. At mesophilic condition, all the digesters showed better performance, and the highest cBG (920 +/- 11 mL) and methane content (48%) were observed in D3. The study suggests that co-digestion of KW and PM at mesophilic condition might be a promising way to increase the production of biogas with better methane composition by ensuring nutrient balance, buffering capacity, and stability of the digester.

关键词： co-digestion Kitchen waste Poultry manure Biogas Degradation rate c N Mesophilic temperature

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氯化镧影响大鼠海马ATP含量、cOX IV及cyt c表达的研究

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毒理学杂志 2020年第1期34卷 1-5页

作者：袁慧孙文昌洪云婷张彦强王剑波蔡原杨敬华中国医科大学公共卫生学院卫生毒理学教研室辽宁沈阳110122

目的探究氯化镧对大鼠海马三磷酸腺苷(Adenosine triph osphate,ATP)含量、细胞色素c氧化酶4(cytochrome c oxidase IV,cOX IV)活性、cOX IV蛋白、线粒体和胞浆中细胞色素c(cytochrome c,cyt c)蛋白表达水平的影响,探究镧损害学习记忆... 详细信息

目的探究氯化镧对大鼠海马三磷酸腺苷(Adenosine triph osphate,ATP)含量、细胞色素c氧化酶4(cytochrome c oxidase IV,cOX IV)活性、cOX IV蛋白、线粒体和胞浆中细胞色素c(cytochrome c,cyt c)蛋白表达水平的影响,探究镧损害学习记忆能力的机制。方法32只成年雌性Wistar大鼠随机分为对照组、低、中和高剂量染镧组,在孕哺期各组分别饮用蒸馏水、0.125%、0.25%和0.5%的Lacl3溶液。仔鼠通过吸吮母乳染镧,哺乳期结束后进行跳台实验,取子代大鼠海马进行ATP含量和cOX IV活性测定,采用Western blot法检测子代大鼠海马组织中cOX IV蛋白、线粒体及胞浆内cyt c蛋白水平。结果与对照组相比,中和高剂量染镧组子代大鼠在跳台实验中学习记忆能力降低、差异具有统计学意义(P<0.05),海马组织中ATP含量和cOX IV活性降低,cOX IV蛋白表达水平降低,差异具有统计学意义(P<0.05)。与对照组相比,中和高剂量染镧组子代大鼠海马线粒体内cyt c蛋白水平降低且差异具有统计学意义(P<0.05),而中和高剂量染镧组胞浆内cyt c蛋白水平升高且差异具有统计学意义(P<0.05)。结论在该试验条件下,镧损害大鼠学习记忆能力的机制可能与海马ATP含量、cOX IV活性、cOX IV蛋白水平下降及线粒体内cyt c蛋白释放到胞浆中有关。

关键词：氯化镧海马 ATP cOX IV cyt c

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Thermochromic properties of pure NiTiO3 and its cu- or co-doped derivatives

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cERAMIcS INTERNATIONAL 2023年第8期49卷 12267-12273页

作者： Acher, Loren Ji, Hyewon Garino, Nicolas Massuyeau, Florian Pontille, Laurie cauwet, Francois Brioude, Arnaud Jobic, Stephane Ferro, Gabriel carole, Davy Univ Claude Bernard Lyon 1 Lab Multimateriaux & Interfaces UMR CNRS 5615 Villeurbanne France Nantes Univ Inst Materiaux Nantes Jean Rouxel CNRS F-44000 Nantes France Univ Lyon 1 Lab Multimateriaux & Interfaces 6 Rue Victor Grignard F-69622 Villeurbanne France

Nickel titanate is a yellow-brown pigment which adopts the ilmenite crystal structure as corundum and hematite. Since cr doped Al2O3 and Fe2O3 present a thermochromic behavior, NiTiO3 was also studied for its potential ability to change colour with temperature. Powders were synthesized via a modified Pechini method followed by a calcination step at 700 degrees c. The thermochromic properties in the 20 degrees c-400 degrees c temperature range were collected via the determination of the colorimetric L*a*b* parameters. Namely, the hue continuously shifts from yellow-brown to red-brown, with L*a*b* parameters moving from 60.4/19.2/58.5 to 42.9/30.5/43.1. This colour change is fully reversible even after several cycling. Temperature dependent UV-vis spectroscopy showed that the transparency window at 550-650 nm at room temperature shifts to 575-650 nm at 400 degrees c. This fully explains the observed colour change. Finally, the effects of cu or co doping on NiTiO3 optical and thermo-chromic properties were also investigated.

关键词： Thermochromism c Optical properties colour D BaTiO3 and titanates

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