Effect of Ti2Cu precipitation on antibacterial property of Ti-5Cu alloy

Publication date: Available online 16 November 2019Source: Materials Science and Engineering: CAuthor(s): Ju-Hui Wu, Ker-Kong Chen, Chih-Yeh Chao, Yen-Hao Chang, Je-Kang DuAbstractTo instill pure Ti with an antibacterial effect, Cu was added by metallurgical alloying to produce Ti–5 wt% Cu alloy (Ti–5Cu alloy). The precipitation of the likes of Ti2Cu in a Ti–Cu alloy is one of the factors that influences its antibacterial property. However, in the present study, Ti–5Cu alloy precipitates with different microstructures were obtained by applying heat treatment at different temperatures and for different durations. After the heat treatment, metallographic, microstructure, and element analyses were performed using scanning electron microscopy (SEM) and transmission electron microscopy (TEM) combined with energy dispersive X-ray spectroscopy (EDS). The antibacterial property of the Ti–5Cu alloy was assessed by the plated-count method using Escherichia coli (E. coli). The microstructure analysis revealed that the solution-treated alloy had no precipitation, while the aged alloy contained precipitations of intermetallic Ti2Cu compound. The aged alloy exhibited better antibacterial performance as the duration of the aging treatment increased. The optimal heat treatment for Ti–5Cu was found to be aging at 700 °C for 4 h, at which point the nucleation formation of the Ti2Cu particles would assume an acicular morphology. These acicular preci...
Source: Materials Science and Engineering: C - Category: Materials Science Source Type: research

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Publication date: Available online 6 December 2019Source: Food Research InternationalAuthor(s): Liping Guo, Yongcai Sun, Yinglian Zhu, Baowei Wang, Lin Xu, Ming Huang, Yufeng Li, Jingxin SunAbstractIn the present study, the action mechanism of ultrasound (US) combined with sodium hypochlorite (SH) against Escherichia coli was illustrated by different analysis, including reduction, particle size distribution, scanning electron microscopy (SEM), transmission electron microscopy (TEM), K+ leakage, confocal laser scanning microscopy (CLSM) and fluorescence spectroscopy of Escherichia coli. The results showed that ultrasound im...
Source: Food Research International - Category: Food Science Source Type: research
Publication date: Available online 6 December 2019Source: Journal of Photochemistry and Photobiology B: BiologyAuthor(s): Sai Kumar Tammina, Yang Wan, Yan Yan Li, Yaling YangAbstractA simple and one-step microwave digestion method was utilized to synthesize the highly photoluminescent glucosamine derived nitrogen and zinc doped carbon dots (N, Zn-CDs) with a bluish-green luminescence property. The synthesized N, Zn-CDs inherited a good photoluminescence property with a quantum yield of 74% and which were characterized with XPS, XRD, TEM, FT-IR, UV–Vis, and fluorescence spectrometry. More importantly N, Zn-CDs served ...
Source: Journal of Photochemistry and Photobiology B: Biology - Category: Speech-Language Pathology Source Type: research
Tin oxide (SnO2) nanoparticles were synthesised using various surfactants of different charges (n-cetyl trimethyl ammonium bromide, sodium dodecyl sulphate and TRITON X-100) by the co-precipitation method. The synthesised nanomaterials were characterised using different techniques to study their structural, surface morphological, optical and anti-bacterial activities. X-ray diffraction patterns revealed the formation of a tetragonal rutile structure in pure and surfactants-aided SnO2 nanoparticles and the results show good agreement with JCPDS data [41-1445]. The crystallite size of SnO2 nanoparticles was found to decrease...
Source: IET Nanobiotechnology - Category: Nanotechnology Source Type: research
An extracellular biosynthesis method has been developed to prepare cadmium selenide (CdSe) quantum dots (QDs) with strong fluorescence emission by incubating cheap Cd and Se inorganic salts with Escherichia coli (E.coli) bacteria. Ultraviolet–visible absorption spectra, photoluminescence (PL) spectra, and high-resolution transmission electron microscopy analysis showed that the biosynthesised CdSe QDs have an average size of 3.1 nm, the excellent optical properties with fluorescence emission around 494 nm, and the good crystallinity. It was found that addition of 80 mg of mercaptosuccinic acid resulted in the f...
Source: IET Nanobiotechnology - Category: Nanotechnology Source Type: research
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Source: World Journal of Urology - Category: Urology & Nephrology Source Type: research
Publication date: Available online 30 November 2019Source: Journal of Microbiological MethodsAuthor(s): Chengran Guan, Yan Ma, Xuan Chen, Ruifeng Zhao, Xinyuan Huang, Jianbo Su, Dawei Chen, Zhen Lu, Qiming Li, Ruixia GuAbstractThe promoter of the srf operon (PsrfA) had been used to construct a cell-density-dependent expression system in B. subtilis in our previous work. The PsrfA and its derivative PsrfA12 showed good performance of heterologous protein expression in B. subtilis. In this work, using green fluorescent protein (GFP) and β-galactosidase (LacZ) as the reporter proteins, the host feasibility and expression...
Source: Journal of Microbiological Methods - Category: Microbiology Source Type: research
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Source: Results in Physics - Category: Physics Source Type: research
In this study, we sequenced and characterized the goose-type lysozyme gene, termed as BsLysG, from the Chinese black sleeper (Bostrychus sinensis). The BsLysG encodes 196 amino acids and contains a soluble bacterial lytic transglycosylases domain, three catalytic residues (Glu72, Asp85 and Asp102) and the GLMQ motif (Gly97, Leu98, Met99 and Gln100). No signal peptide was observed in the BsLysG protein. The genomic DNA of BsLysG contains five exons and four introns. The sequence analyses showed that the BsLysG exhibits high similarity with LysG from other fishes. Phylogenetic analyses showed that the BsLysG is clustered tog...
Source: Fish and Shellfish Immunology - Category: Biology Source Type: research
Publication date: March 2020Source: Materials Science and Engineering: C, Volume 108Author(s): Yunan Qing, Kaishen Li, Dongdong Li, Yanguo QinAbstractFunctionalization of porous metals with antibacterial coatings is hotly pursued in recent decade. Here we fabricated a highly porous stainless steel component by selective laser melting and then coated with silver incorporated zeolite by in situ hydrothermal crystallization method. The morphology of their surface was investigated by scanning electron microscopy. The inhibition of Escherichia coli and Staphylococcus aureus were identified by bacterial viability studies after 2...
Source: Materials Science and Engineering: C - Category: Materials Science Source Type: research
In this study a novel and smart multi-functional hydrogel (MFH) was synthesized from N, N dimethyl acrylamide (DMAAm), gelatin, citric acid (CA) and pomegranate extract (PE) for instant and easy monitoring of the color change in MFH due to changes in medium conditions such as pH and temperature. MFH was utilized as food packaging material, equipped with the developed properties. MFH was synthesized with a redox polymerization technique in film form on petri dishes. Mechanical and water resistance properties of MFH were improved by CA and N, N, methylenebisacrylamide, while PE was used to gain antimicrobial, antioxidant and...
Source: Materials Science and Engineering: C - Category: Materials Science Source Type: research
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