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The safety perspective of probiotic and non-probiotic yoghurts:a review

Food Quality and Safety 2019年第1期3卷 9-14页

作者： aziz homayouni rad Mina Javadi Hossein Samadi Kafil Haniyeh Rasouli Pirouzian Mahsa Khaleghi Department of Food Science and Technology Faculty of Nutrition and Food Sciences Drug Applied Research Center Tabriz University of Medical SciencesIran

Objectives:Milk and dairy products could be contaminated via various bacteria and *** have demonstrated that the contamination in traditionally yoghurt was higher than industrially processed *** milk with neutral pH and high water activity,serves as an excellent growth medium for different microorganisms,Therefore,the prepared yoghurts may be *** greatest and most widespread concern of yoghurt safety is microbial contamination,the presence of infectious bacteria and *** and Methods:“Probiotic yoghurt”was uses as key word in PubMed and science direct search engines during 1998-2018 and 70 papers were found and forty of them were used in this ***:Existence of yeasts and molds in industrial yoghurt is an indicative of poor hygienic practices in manufacturing and *** are a group of very toxic metabolites of fungi produced by toxicogenic strains of Aspergillus flavus,Aspergillus parasiticus and Aspergillus nomius in milk and dairy *** B1 is the most frequent produced mycotoxin in contaminated *** is a direct relationship between the AFM1 presences in yoghurt the risk of illnesses in ***:In conclusion,it is important to notify producers and consumers about the safety and contamination of yoghurt in order to reduce their potential health hazard and economic *** respect to the safety and health effects of probiotics,it is recommended to consume the probiotic yoghurt.

关键词： safety probiotic non-probiotic yoghurt.

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Modeling frequency distributions of tree height, diameter and crown area by six probability functions for open forests of Quercus persica in Iran

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Journal of Forestry Research 2016年第4期27卷 901-906页

作者： Mehrdad Mirzaei Jalal aziz Ali Mahdavi Asma Mohammad rad University of Guilan Sowmeh Sara City GuilanIslamic Republic of Iran Faculty of Natural Resources University of GuilanSowmeh Sara Islamic Republic of Iran Faculty of Agriculture university of Ilam IlamIslamic Republic of Iran Faculty of Natural Resources University of Tehran KarajIslamic Republic of Iran

The prediction of the distribution of quantitative variables in a forest stand is of great interest to forest managers, for the evaluation of forest resources and scheduling of future silvicultural treatments. The aim of this research was to model the distribution of quantitative variables for Quercus persica in open forests in Iran. To investigate the probability distribution of trees in natural stands, 642 trees were selected for measurement using a systematic random sampling method. Selected trees were measured and data were analyzed. Gamma, beta, normal,lognormal, exponential and Weibull probability distributions were fitted to the height distribution of trees. Variables of distribution functions were estimated using the maximum likelihood estimation method. Actual probability and probability which derived from functions was compared using Kolmogorov–Smirnov and Anderson–Darling tests. Beta, Weibull and Weibull probability distributions explained the distributions of tree height, DBH and crown area.

关键词： forests Quercus stands crown canopy Weibull Kolmogorov Darling exponential fitted

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Synthesis and in-vitro characterization of biodegradable porous magnesium-based scaffolds containing silver for bone tissue engineering

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Transactions of Nonferrous Metals Society of China 2019年第5期29卷 984-996页

作者： Hamid Reza BAKHSHESHI-rad Ehsan DAYAGHI Ahmad Fauzi ISMAIL Madzlan aziz Ali AKHAVAN-FARID Xiongbiao CHEN Advanced Materials Research Center Department of Materials Engineering Najafabad Branch Islamic Azad University Advanced Membrane Technology Research Center (AMTEC) Universiti Teknologi Malaysia Department of Mechanical Engineering College of Engineering University of Saskatchewan Department of Mechanical Materials and Manufacturing Engineering University of Nottingham Malaysia Campus Division of Biomedical Engineering College of Engineering University of Saskatchewan

Infection is a major potential complication in the clinical treatment of bone injuries. Magnesium (Mg)-based composites are biodegradable and antibacterial biomaterials that have been employed to reduce infection following surgical implants. The aim of present study was to synthesize and in-vitro characterize Mg-based scaffolds containing silver for bone tissue engineering. Porous Mg-based scaffolds with four silver concentrations (i.e., 0, 0.5 wt.%, 1 wt.%, and 2 wt.%), denoted by Mg?Ca?Mn-Zn-xAg (MCMZ?xAg)(where x is the silver concentration), were fabricated by the space holder technique. The effects of silver concentration on pore architecture, mechanical properties, bioactivity, and zone of bacterial inhibition were investigated in-vitro. X-ray diffractometry (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and fluorescence microscopy were utilized to characterize the obtained scaffolds. In-vitro corrosion test results indicated that the MCMZ scaffolds with lower silver content were more resistant to corrosion than those enriched with higher amounts of silver. Examination of the antibacterial activity showed that the MCMZ?Ag scaffolds exhibited superb potential with respect to suppressing the growth of Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus), in the inhibition zone around the MCMZ?Ag scaffolds, with increasing in the amount of incorporated silver;however, higher amounts of silver increased the cytotoxicity. Taken together, the results of this study demonstrate that the porous 0.5 wt.% Ag-containing scaffolds with interconnected pores, adequate mechanical properties, antibacterial activity, and cell adhesion are promising with respect to the repair and substitution of damaged and diseased bones.

关键词： Mg-based scaffold biocompatibility antibacterial activities bioactivity corrosion behavior

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Bioactivity,in-vitro corrosion behavior,and antibacterial activity of silver-zeolites doped hydroxyapatite coating on magnesium alloy

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Transactions of Nonferrous Metals Society of China 2018年第8期28卷 1553-1562页

作者： H.R.BAKHSHESHI-rad E.HAMZAH A.F.ISMAIL M.aziz E.KARAMIAN N.IQBAL Advanced Materials Research Center Department of Materials EngineeringNajafabad Branch Islamic Azad University Department of Materials Manufacturing and Industrial EngineeringFaculty of Mechanical Engineering Universiti Teknologi Malaysia Advanced Membrane Technology Research Center (AMTEC) Universiti Teknologi Malaysia Department of Biomedical Engineering University of Engineering and TechnologyLahore Pakistan

Mg-based alloys received significant attention for temporary implant applications while, their applications have been limited by high degradation rate. Therefore, silver-zeolite doped hydroxyapatite（Ag-Zeo-HAp） coating was synthesized on Ti O2-coated Mg alloy by physical vapour deposition（PVD） assisted electrodeposition technique to decrease the degradation rate of Mg alloy. X-ray diffraction（XRD） analysis and field emission scanning electron microscopy（FE-SEM） images showed the formation of a uniform and compact layer of Ag-Zeo-HAp with a thickness of 15 μm on the Ti O2 film with a thickness of 1 μm. The potentiodynamic polarization（PDP） and electrochemical impedance spectroscopy（EIS） tests indicated that corrosion resistance of Mg-Ca alloy was considerably increased by the Ag-Zeo-HAp coating. The bioactivity test in the simulated body fluid（SBF） solution showed that a dense and homogeneous bonelike apatite layer was formed on the Ag-Zeo-HAp surface after 14 d. Investigation of antibacterial activity via disk diffusion and spread plate methods showed that the Ag-Zeo-HAp coating had a significantly larger inhibition zone（3.86 mm） towards Escherichia coli（E. coli） compared with the Ti O2-coated Mg alloy（2.61 mm）. The Ag-Zeo-HAp coating showed high antibacterial performance, good bioactivity, and high corrosion resistance which make it a perfect coating material for biomedical applications.

关键词： magnesium alloy zeolite coatiilg bioactivity conosion behavior antibacterial activity

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