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Bio-inspired carbon electro-catalysts for the oxygen reduction reaction

Journal of Energy Chemistry 2016年第2期25卷 226-233页

作者： Kathrin Preuss Vasanth Kumar Kannuchamy Adam Marinovic mark isaacs Karen Wilson Isaac Abrahams Maria-Magdalena Titirici School of Engineering and Materials Science Queen Mary University of London Materials Research Institute Queen Mary University of London European Bioenergy Research Institute Aston University School of Biological and Chemical Sciences Queen Mary University of London

We report the synthesis, characterisation and catalytic performance of two nature-inspired biomassderived electro-catalysts for the oxygen reduction reaction in fuel cells. The catalysts were prepared via pyrolysis of a real food waste（lobster shells） or by mimicking the composition of lobster shells using chitin and CaCO3 particles followed by acid washing. The simplified model of artificial lobster was prepared for better reproducibility. The calcium carbonate in both samples acts as a pore agent, creating increased surface area and pore volume, though considerably higher in artificial lobster samples due to the better homogeneity of the components. Various characterisation techniques revealed the presence of a considerable amount of hydroxyapatite left in the real lobster samples after acid washing and a low content of carbon（23%）, nitrogen and sulphur（〈1%）, limiting the surface area to 23 m^2/g, and consequently resulting in rather poor catalytic activity. However, artificial lobster samples, with a surface area of ≈200 m^2/g and a nitrogen doping of 2%, showed a promising onset potential, very similar to a commercially available platinum catalyst, with better methanol tolerance, though with lower stability in long time testing over 10,000 s.

关键词： Carbonisation Biomass-derived carbons Oxygen reduction reaction Fuel cells Electro-catalysis

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Small bowel ulcerative lesions are common in elderly NSAIDs users with peptic ulcer bleeding

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World Journal of Gastrointestinal Endoscopy 2014年第12期6卷 612-619页

作者： Panagiotis Tsibouris Chissostomos Kalantzis Periklis Apostolopoulos Antonios Zalonis Peter Edward Thomas isaacs mark Hendrickse Georgios Alexandrakis Department of Gastroenterology NIMTS General Hospital Gastroenterologist Blackpool Victoria Hospital Blackpool FY3 8NR Lancashire United Kingdom

AIM: To determine the frequency of small bowel ulcerative lesions in patients with peptic ulcer and define the significance of those lesions. METHODS: In our prospective study, 60 consecutive elderly patients with upper gastrointestinal bleeding from a peptic ulceration(cases) and 60 matched patients with a non-bleeding peptic ulcer(controls) underwent small bowel capsule endoscopy, after a negative colonoscopy(compulsory in our institution). Controls were evaluated for non-bleeding indications. Known or suspected chronic inflammatory conditions and medication that could harm the gut were excluded. During capsule endoscopy, small bowel ulcerative lesions were counted thoroughly and classified according to Graham classification. Other small bowellesions were also recorded. Peptic ulcer bleeding was controlled endoscopically, when adequate, proton pump inhibitors were started in both cases and controls, and Helicobacter pylori eradicated whenever present. Both cases and controls were followed up for a year. In case of bleeding recurrence upper gastrointestinal endoscopy was repeated and whenever it remained unexplained it was followed by repeat colonoscopy and capsule ***: Forty(67%) cases and 18(30%) controls presented small bowel erosions(P = 0.0001), while 22(37%) cases and 4(8%) controls presented small bowel ulcers(P < 0.0001). Among non-steroidal antiinflammatory drug(NSAID) consumers, 39(95%) cases and 17(33%) controls presented small bowel erosions(P < 0.0001), while 22(55%) cases and 4(10%) controls presented small bowel ulcers(P < 0.0001). Small bowel ulcerative lesions were infrequent among patients not consuming NSAIDs. Mean entry hemoglobin was 9.3(SD = 1.4) g/d L in cases with small bowel ulcerative lesions and 10.5(SD = 1.3) g/dL in those without(P = 0.002). Cases with small bowel ulcers necessitate more units of packed red blood cells. During their hospitalization, 6(27%) cases with small bowel ulcers presented bleeding recurrence most po

关键词： Non-steroidal anti-inflammatory drugs Aspirin Wireless capsule endoscopy Small bowel ulcerative lesions Peptic ulcer bleeding

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Upper and Lower Bounds of Table Sums

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Algebra Colloquium 2021年第4期28卷 555-560页

作者： Xiaoyou Chen mark L.Lewis Hung P.Tong-Viet School of Sciences Henan University of TechnologyZhengzhou 450001China Department of Mathematical Sciences Kent State UniversityKentOH 44242USA Department of Mathematical Sciences Binghamton University 4400 Vestal Parkway EastBinghamtonNY 13902-6000USA

For a group G,we produce upper and lower bounds for the sum of the entries of the Brauer character table of G and the projective indecomposable character table of *** G is aπ-separable group,we show that the sum of the entries in the table of isaacs'partial characters is a real number,and we obtain upper and lower bounds for this sum.

关键词： character table Brauer characters projective indecomposable characters π-paxtial characters

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Ischemic heart disease,factor predisposing to Barrett's adenocarcinoma: A case control study

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World Journal of Gastrointestinal Pharmacology and Therapeutics 2014年第3期5卷 183-190页

作者： Panagiotis Tsibouris mark T Hendrickse Panagiota Mavrogianni Peter ET isaacs Gastroenterology Department NIMTS General Hospital11521 AthensGreece Gastroenterology Department Blackpool Victoria HospitalLancashire FY3 8NRUnited Kingdom

AIM:To define the significance of ischemic heart disease(IHD)(stable angina to infarction) co-existance in Barrett esophagus(BE) patients and patients with esophageal adenocarcinoma(AdE).METHODS: All BE/AdE patients in Blackpool-Wyre-Fylde area and Trikala prefecture identified from medical records. Patient clinical details were obtained from hospital and General Practitioner records. Additional information was gathered from validated ***: Forty(33%) AdE and 83(19%) BE patients had IHD(P = 0.002). Eighteen(15%) AdE and 34(8%) BE patients had suffered a myocardial infarction(P = 0.03). Three(3%) AdE and 7(2%) BE patients had severe heart failure(P = 0.82). Thirty-nine(47%) BE with IHD and 8(20%) AdE patients with IHD consumed aspirin daily(P = 0.004). Seventh-seven(93%) BE patients with IHD and 36(90%) AdE patients with IHD were on statins(P = 0.86). Logistic regression analysis: AdE was more frequent in the elderly,with long termreflux,long BE and concurrent IHD(odds ratio: 2.086,P = 0.001) not consuming statins. Eighteen(22%) BE patients with IHD [16(84%) with myocardial infarction] vs 33(10%) without IHD died from non-neoplastic causes within 24 mo from BE diagnosis(P = 0.005). CONCLUSION: IHD is more prevalent in AdE than BE patients. Increased prevalence of AdE is related with the presence of myocardial infarction but not severe heart failure,possibly because patients with BE and se-vere IHD have low life expectancy.

关键词： Barrett esophagus Esophageal adenocarcinoma Ischemic heart disease Myocardial infarction Non-steroidal anti-inflammatory drugs

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