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Microbial biofilms in seafood: A food-hygiene challenge
Mizan, Md. Furkanur Rahaman,Jahid, Iqbal Kabir,Ha, Sang-Do Elsevier 2015 FOOD MICROBIOLOGY Vol.49 No.-
<P><B>Abstract</B></P> <P>Seafood forms a part of a healthy diet. However, seafood can be contaminated with foodborne pathogens, resulting in disease outbreaks. Because people consume large amounts of seafood, such disease outbreaks are increasing worldwide. Seafood contamination is largely due to the naturally occurring phenomenon of biofilm formation. The common seafood bacterial pathogens that form biofilms are Vibrio spp., Aeromonas hydrophila, Salmonella spp., and Listeria monocytogenes. As these organisms pose a global health threat, recent research has focused on elucidating methods to eliminate these biofilm-forming bacteria from seafood, thereby improving food hygiene. Therefore, we highlight recent advances in our understanding of the underlying molecular mechanisms of biofilm formation, the factors that regulate biofilm development and the role of quorum sensing and biofilm formation in the virulence of foodborne pathogens. Currently, several novel methods have been successfully developed for controlling biofilms present in seafood. In this review, we also discuss the epidemiology of seafood-related diseases and the novel methods that could be used for future control of biofilm formation in seafood.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Bacterial biofilms contaminate seafood. </LI> <LI> Most <I>Vibrio</I> spp. form biofilms on seafood. </LI> <LI> Numerous factors affect biofilm formation on seafood. </LI> <LI> Use of novel biofilm-reducing methods could minimize seafood-borne diseases. </LI> </UL> </P>
Mizan, Md Furkanur Rahaman,Ashrafudoulla, Md,Sadekuzzaman, Mohammad,Kang, Iksoon,Ha, Sang-Do Elsevier 2018 Food Control Vol.89 No.-
<P><B>Abstract</B></P> <P>The aim of this study was to evaluate the promotive and/or inhibitory effects of NaCl, glucose, their combinations on biofilm formation and quorum sensing (QS) autoinducer-2 (AI-2) production on black tiger shrimp surfaces, using three strains of <I>Vibrio parahaemolyticus</I>. Initially, six different NaCl concentrations (0.5, 1, 2, 3, 4, and 5%) were evaluated for a maximum biofilm formation (∼6.3 log CFU/cm<SUP>2</SUP>) at 30 °C. Inhibitory effects of glucose at six different levels (0.005, 0.01, 0.015, 0.02, 0.025, and 0.05%) were then investigated using the NaCl level previously found for a maximal biofilm formation. <I>V. parahaemolyticus</I> formed the best biofilm at 2% NaCl and the least biofilm at 5% NaCl, regardless of <I>vibrio</I> strain. In combination of 2% NaCl and glucose at different levels, the largest biofilm was observed at 0.015%, with the least biofilm seen at 0.05%, regardless of <I>vibrio</I> strain. Addition of salt and glucose more than the optimal level (2% salt and 0.015% glucose at 2% salt) inducted a stepwise inhibition of <I>vibrio</I> growth and biofilm formation in a continuous matter. In the visual evaluation, similar results were observed for <I>vibrio</I> growth, biofilm formation, live/dead cell detection, and quorum sensing.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Combined effect of NaCl-Glucose were studied on <I>V. parahaemolyticus</I> biofilm and quorum sensing. </LI> <LI> AI-2 detection was performed by HPLC-FLD. </LI> <LI> FESEM and CLSM analysis were investigated for visual observation. </LI> </UL> </P>
Mizan Tesfay Abraha,Shimelis Hussein,Mark Laing,Kebebew Assefa 한국작물학회 2017 Journal of crop science and biotechnology Vol.20 No.5
The extent of genetic variation and heritability of a trait are among the major determinants of selection gains in plant breeding programs. The aim of this study was to determine the magnitude of genetic variation and inheritance of grain yield, and component traits of newly developed tef populations under moisture-stressed and non-stressed conditions for drought tolerance breeding. Seventeen crosses along with the parents were evaluated in the F2 generation under moisture-stressed and non-stressed conditions in northern Ethiopia during 2015 and 2016. There were marked genotypic and phenotypic variation among the crosses in the F2 generation for plant height, panicle length, peduncle length, number of productive tillers per plant, main shoot panicle seed weight, biomass yield, and grain yield under both test conditions, important for successful selection and genetic advancement. The families of DZ-Cr-387 x 207832 and DZ-Cr-387 x 222076 were high grain yielders with early maturity under both test conditions.
Mizan, Md. Furkanur Rahaman,Jahid, Iqbal Kabir,Kim, Minhui,Lee, Ki-Hoon,Kim, Tae Jo,Ha, Sang-Do Taylor Francis 2016 BIOFOULING -CHUR- Vol.32 No.4
<P>Vibrio parahaemolyticus is one of the leading foodborne pathogens causing seafood contamination. Here, 22 V. parahaemolyticus strains were analyzed for biofilm formation to determine whether there is a correlation between biofilm formation and quorum sensing (QS), swimming motility, or hydrophobicity. The results indicate that the biofilm formation ability of V. parahaemolyticus is positively correlated with cell surface hydrophobicity, autoinducer (AI-2) production, and protease activity. Field emission scanning electron microscopy (FESEM) showed that strong-biofilm-forming strains established thick 3-D structures, whereas poor-biofilm-forming strains produced thin inconsistent biofilms. In addition, the distribution of the genes encoding pandemic clone factors, type VI secretion systems (T6SS), biofilm functions, and the type I pilus in the V. parahaemolyticus seafood isolates were examined. Biofilm-associated genes were present in almost all the strains, irrespective of other phenotypes. These results indicate that biofilm formation on/in seafood may constitute a major factor in the dissemination of V. parahaemolyticus and the ensuing diseases.</P>
Genesis of the Heneshk IOCG deposit, Iran: magnetite mineral chemistry and sulfur isotope
Morteza Mizan,Xiao-Wen Huang 한국지질과학협의회 2020 Geosciences Journal Vol.24 No.5
The Heneshk Fe ± Cu deposit, a metamorphosed IOCG (Iron Oxide Copper Gold) is situated in Sanandaj–Sirjan Zone, SW Iran. Mineralization occurs as two stratabound ‘U’ shape ore bodies, hosted by a meta-dolomite member of a metamorphic complex. The ore and gangue minerals comprise magnetite, chalcopyrite, hematite, martite, mushketovite, pyrite, barite, calcite, dolomite, and quartz. The successive mineral assemblage formed in the five paragenetic stages (I to V) during an ongoing deformation regime from the plastic to the brittle deformation regime. The mineralization stages comprise stage I, III, and IV. Stage I–III and IV formed in the plastic and the brittle deformation regime by the metamorphic processes in a shear zone, respectively. The concomitant alteration products of these stages comprise sodic, Fe, K, hydrolytic and silicification. The sodic and Fe alterations occur as a pre-mineralization stage and each mineralization stage is accompanied by K and hydrolytic alterations. A late barite-calcite-quartz assemblage (stage V) overprinted on the previous stages (I to IV). Stage I mineralization formed at a depth of ~10 km and temperature of ~300 °C (a high pressure-low temperature environment). The partitioning and substitution of the Mg, Al, Ti, Ni, Cr, Mn, Si, and Zn elements increased in this relatively higher pressure environment cause of the highest concentrations of the Al, Ti, Ni, Cr, and Zn, in comparison with metamorphic magnetite. The mineral chemistry of the Heneshk magnetite (average elemental concentrations) is in accordance with the metamorphic magnetite and can consider as a pure magnetite with the low elemental concentration. Also, the δ34SH2S Heneshk mineralized fluid ranges between 39.8 to 40.6‰, indicating the contribution of the paleo-evaporates. The pleo-evaporates leached from the older strata during metamorphism, and their precipitation in the form of the sulfide minerals occurs through the TSR (Thermochemical Sulfate Reduction) mechanism.
Abdul Kadir OTHMAN(Abdul Kadir OTHMAN ),Mizan HITAM(Mizan HITAM ),Zuhaina ZAKARIA(Zuhaina ZAKARIA ),Mohd Rafizi RAHMAD(Mohd Rafizi RAHMAD ),Zuraidah MOHD SANUSI(Zuraidah MOHD SANUSI ) 한국유통과학회 2022 The Journal of Asian Finance, Economics and Busine Vol.9 No.9
The purpose of this paper is to explain the process of developing and validating the instrument to measure the university’s organizational core values and sub-values known as ESI iDART. The three core values are excellence, synergy, and integrity, while the five sub-values comprise knowledge, discipline, trustworthiness, diligence, and responsibility that all staff should understand and practice. These values must be measured to examine the extent to which the staff has practiced them in their work life. With regard to methodology, the research instrument used in the study was developed using a focus group study involving 39 university staff from various departments and campuses. The instrument was later refined and validated by a group of experts from the university. In the main study, the instrument was distributed to all 17,969 university staff from all over the country. After one month, a total of 11,688 university staff participated in the survey indicating a 66% response rate. Using descriptive analysis, reliability analysis, and ANOVA, the results indicate that instrument is considered valid and reliable to be used. The major findings from the study show that organizational values increase over time. Some theoretical and managerial implications are also discussed.
Buckling resistance of axially loaded square concrete-filled double steel tubular columns
Junchang Ci,Mizan Ahmed,Viet-Linh Tran,Hong Jia,Shicai Chen,Tan N. Nguyen 국제구조공학회 2022 Steel and Composite Structures, An International J Vol.43 No.6
Thin-walled square concrete-filled double steel tubular (CFDST) columns composed of the inner circular tube filled with concrete can be used to carry the large axial loads or strengthen existing CFST columns in composite constructions. This paper reports an experimental program carried out on short square CFDST columns loaded concentrically. The influences of important column parameters on the post-buckling performance of such columns are investigated. Test results exhibit that the inner circular tube significantly improves the ultimate loads and the ductility of such columns compared to conventional concrete-filled steel tubular (CFST) and double-skin CFST (DCFST) columns with an inner void. A mathematical model developed is used to simulate the ultimate strengths and load-strain curves of such columns loaded axially. Furthermore, the ultimate strengths of such columns are predicted using existing codified design models for conventional CFST columns as well as the formulas proposed by previous researchers and compared against a large database comprising 500 CFDST columns. Lastly, an accurate artificial neural network model is developed for the practical applications of such columns under axial loading.