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Fungal-derived selenium nanoparticles and their potential applications in electroless silver coatings for preventing pin-tract infections

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Regenerative Biomaterials 2022年第1期9卷 41-51页

作者： Xinjin Liang Shuai Zhang geoffrey michael gadd John McGrath David W.Rooney Qi Zhao The Bryden Centre School of Chemical and Chemistry EngineeringQueen’s University BelfastUniveristy RoadBelfast BT71NNUK Geomicrobiology Group School of Life SciencesUniversity of DundeeDow StreetDundee DD15EHUK School of Pharmacy Queen’s University BelfastLisburn RoadBelfast BT97BLUK State Key Laboratory of Heavy Oil Processing Beijing Key Laboratory of Oil and Gas Pollution ControlCollege of Chemical Engineering and EnvironmentChina University of Petroleum18 Fuxue RoadChangping DistrictBeijing 102249China School of Biological Sciences Queen’s University BelfastChlorine GardensBelfast BT95DLUK School of Chemistry and Chemical Engineering Queen’s University BelfastStranmillis RoadBelfast BT95AGUK School of Science and Engineering University of DundeeNethergateDundee DD14HNUK

Pin-tract infections(PTIs)are a common complication of external fixation of fractures and current strategies for preventing PTIs have proven to be *** advances show that the use of anti-infection coatings with local antibacterial activity may solve this *** has been considered as a promising anti-infection agent owing to its antibacterial and antibiofilm *** this study,selenium nanoparticles(SeNPs)were synthesized via a cost-effective fungi-mediated biorecovery approach and demonstrated excellent stability and *** investigate their anti-infection potential,the SeNPs were doped in silver coatings through an electroless plating process and the silver–selenium(Ag–Se)coatings were tested for antibacterial and antibiofilm properties against Staphylococcus aureus F1557 and Escherichia coli WT F1693 as well as corrosion resistance in simulated body *** was found that the Ag–Se coating significantly inhibited *** growth and biofilm formation on the surface,reducing 81.2%and 59.7%of viable bacterial adhesion when compared with Ag and Ag–PTFE-coated surfaces after 3 *** Ag–Se coating also exhibited improved corrosion resistance compared with the Ag coating,leading to a controlled release of Ag^(+),which in turn reduced the risk of cytotoxicity against *** results suggest that the fungal-derived SeNPs may have potential in use as implant coatings to prevent PTIs.

关键词： infection coating silver selenium fungi

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Rapid aerobic granulation using biochar for the treatment of petroleum refinery wastewater

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Petroleum Science 2020年第5期17卷 1411-1421页

作者： Xin Wang Jie Ming Chun-Mao Chen Brandon A.Yoza Qian-Wei Li Jia-Hao Liang geoffrey michael gadd Qing-Hong Wang State Key Laboratory of Heavy Oil Processing State Key Laboratory of Petroleum Pollution ControlChina University of Petroleum-BeijingBeijing 102249China Hawaii Natural Energy Institute University of Hawaii at ManoaHonoluluHI 96822USA Geomicrobiology Group School of Life SciencesUniversity of DundeeDundee DD15EHScotlandUK

Aerobic granular sludge technology has great potential for the treatment of petroleum refinery ***,strategies to shorten the granulation time and improvement the stability still need to be *** this work,biochar was prepared from waste petroleum activated sludge(biochar-WPS) and used in a sequencing batch reactor for the treatment of petroleum refinery ***-WPS presented the surface area of 229.77 m2/g,pore volume of 0.28 cm3/g,H/C and O/C atomic ratios of 0.42 and 0.21,*** porous structure and a high degree of hydrophilicity were found to facilitate microbial colonization and adhesion as well as particle *** of biochar-WPS resulted in the formation of more substantial and stable aerobic granules(~66% of granules> 0.46 mm diameter) 15 days earlier compared with the *** addition of biochar-WPS enhanced the average removal efficiency of chemical organic demand(~3%),oil(~4%)and total nitrogen(~10%) over the *** microbial richness and diversity were observed within the formed granules and had an increased(~4%) proportion of denitrifying *** results indicate that an aerobic granulation mechanism using biochar-WPS is a feasible option for the treatment of petroleum refinery wastewater.

关键词： Biochar Petroleum refinery wastewater Petroleum activated sludge Granular sludge Denitrifying bacteria

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环境中的真菌

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国外科技新书评介 2008年第9期 17-18页

作者： G.M. gadd 张涛不详中国科学院微生物研究所博士生

真菌在陆地生态系统中具有非常重要的作用，在分解有机体、植物致病、共生生物体和元素循环中起着关键的作用。由于传统学科的划分界限，菌物学家对该领域缺乏研究。

关键词：真菌环境陆地生态系统元素循环菌物学家有机体生物体植物

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Induction of chronic cholestasis without liver cirrhosis-Creation of an animal model

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World Journal of Gastroenterology 2017年第23期23卷 4191-4199页

作者： Felix Dondorf RenéFahrner michael Ardelt Eleonora Patsenker Felix Stickel Uta Dahmen Utz Settmacher Falk Rauchfuβ Department of General Visceral and Vascular SurgeryJena University Hospital Division of Gastroenterology and Hepatology University Hospital Zürich

To analyze time intervals of inflammation and regeneration in a cholestatic rat liver *** 36 Lewis rats, divided into six groups of 6 animals (postoperative observation periods: 1, 2, 3, 4, 6, 8 wk), the main bile duct was ligated with two ligatures and observed for the periods mentioned above. For laboratory evaluation, cholestasis parameters (bilirubin, γ-GT), liver cell parameters (ASAT, ALAT) and liver synthesis parameters (quick, albumin) were determined. For histological analysis, HE, EvG, ASDCL and HMGB-1 stainings were performed. Furthermore, we used the mRNA of IL-33, gadd45a and p-21 for analyzing cellular stress and regeneration in cholestatic *** chemical laboratory and histological evaluation, a distinction between acute and chronic cholestatic liver injury with identification of inflammation and regeneration could be demonstrated by an increase in cholestasis (bilirubin: 1-wk group, 156.83 ± 34.12 μmol/L, P = 0.004) and liver cell parameters (ASAT: 2-wk group, 2.1 ± 2.19 μmol/L.s, P = 0.03; ALAT: 2-wk group, 1.03 ± 0.38 μmol/L.s, P = 0.03) after bile duct ligation (BDL). Histological evaluation showed an increase of bile ducts per portal field (3-wk group, 48 ± 6.13, P = 0.004) during the first four weeks after bile duct ligation. In addition to inflammation, which is an expression of acute cholestasis, there was an increase of necrotic areas in the histological sections (2-wk group, 1.38% ± 2.28% per slide, P = 0.002). Furthermore, the inflammation could be verified by ASDCL (4-wk group, 22 ± 5.93 positive cells per portal field, P = 0.041) and HMGB-1 [2-wk group, 13 ± 8.18 positive cells per field of view (FoV), P = 0.065] staining. Therefore, in summary of the laboratory evaluation and histological studies, acute cholestasis could be found during the first four weeks after bile duct ligation. Subsequently, the described parameters declined so that chronic cholestasis could be assumed. For quantification of secondary biliary ci

关键词： Rats Cholestasis Chronic cholestasis Rat liver model

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Identification of differentially expressed genes after partial rat liver ischemia/reperfusion by suppression subtractive hybridization

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World Journal of Gastroenterology 2005年第9期11卷 1303-1316页

作者： Christine Fallsehr Christina Zapletal michael Kremer Resit Demir Magnus von Knebel Doeberitz Ernst Klar Institute of Molecular Pathology Department of Surgery

AIM: To identify potential diagnostic target genes in early reperfusion periods following warm liver ischemia before irreversible liver damage occurs. METHODS: We used two strategies (SSH suppression subtractive hybridization and hybridization of cDNA arrays) to determine early changes in gene expression profiles in a rat model of partial WI/R, comparing postischemic and adjacent nonischemic liver lobes. Differential gene expression was verified (WI/R; 1 h/2 h) and analyzed in more detail after warm ischemia (1 h) in a reperfusion time kinetics (0, 1, 2 and 6 h) and compared to untreated livers by Northern blot hybridizations. Protein expression was examined on Western blots and by immunohistochemistry for four differentially expressed target genes (Hsp70, Hsp27, gadd45a and IL-1rI). RESULTS: Thirty-two individual WI/R target genes showing altered RNA levels after confirmation by Northern blot analyzes were identified. Among them, six functionally uncharacteristic expressed sequences and 26 known genes (12 induced in postischemic liver lobes, 14 with higher transcriptional expression in adjacent nonischemic liver lobes). Functional categories of the verified marker genes indicate on the one hand cellular stress and tissue damage but otherwise activation of protective cellular reactions (AP-1 transcription factors, apoptosis related genes, heat shock genes). In order to assign the transcriptional status to the biological relevant protein level we demonstrated that Hsp70, Hsp27, gadd45a and IL-1rI were clearly up-regulated comparing postischemic and untreated rat livers, suggesting their involvement in the WI/R context. CONCLUSION: This study unveils a WI/R response gene set that will help to explore molecular pathways involved in the tissue damage after WI/R. In addition, these genes especially Hsp70 and gadd45a might represent promising new candidates indicating WI/R liver damage.

关键词： Organ injury Liver ischemia AP-1 transcription factor Heat shock protein gadd45A Suppression subtractive hybridization

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