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Occurrence of Clostridium perfringens contamination in poultry feed ingredients:Isolation, identification and its antibiotic sensitivity pattern

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Animal Nutrition 2017年第3期3卷 309-312页

作者： Shanmugasundaram Udhayavel Gopalakrishnamurthy Thippichettypalayam Ramasamy Vasudevan Gowthaman shanmugasamy malmarugan Kandasamy Senthilvel Poultry Disease Diagnosis and Surveillance Laboratory Veterinary College and Research Institute CampusTamil Nadu Veterinary and Animal Sciences University Department of Veterinary Microbiology Veterinary College and Research InstituteTamil Nadu Veterinary and Animal Sciences University

This work has been undertaken to study the occurrence of Clostridium perfringens contamination in the poultry feed ingredients and find out its in-vitro antibiotic sensitivity pattern to various antimicrobial drugs. Two hundred and ninety-eight poultry feed ingredient samples received at Poultry Disease Diagnosis and Surveillance Laboratory, Namakkal, Tamil Nadu in South India were screened for the presence of C. perfringens. The organisms were isolated in Perfringens agar under anaerobic condition and subjected to standard biochemical tests for confirmation. In vitro antibiogram assay has been carried out to determine the sensitivity pattern of the isolates to various antimicrobial drugs. One hundred and one isolates of C. perfringens were obtained from a total of 298 poultry feed ingredient samples. Overall positivity of 33.89% could be made from the poultry feed ingredients. Highest level of C. perfringens contamination was detected in fish meal followed by bone meal, meat and bone meal and dry *** assay indicated that the organisms are highly sensitive to gentamicin(100%), chlortetracycline(96.67%), gatifloxacin(93.33%), ciprofloxacin(86.67%), ofloxacin(86.67%) and lincomycin(86.67%). All the isolates were resistant to penicillin-G. Feed ingredients rich in animal proteins are the major source of C. perfringens contamination.

关键词： Poultry feed ingredients Contamination Clostridium perfringens Isolation Identification Antibiogram

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Development of CeO_2 nanorods reinforced electrodeposited nickel nanocomposite coating and its tribological and corrosion resistance properties

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Journal of Rare Earths 2018年第12期36卷 1319-1325页

作者： S.shanmugasamy K.Balakrishnan A.Subasri S.Ramalingam A.Subramania Centre for Nanoscience and Technology Pondicherry University Department of Chemistry Kalasalingam University

A simple electrodeposition technique was used to prepare Ni-CeOnanorods composite coating(Ni-CeONRs) using Watt’s nickel plating bath containing CeOnanorods(NRs) as the reinforcement phase under optimized process conditions. The X-ray diffraction analysis(XRD) was used for the structural analysis of Ni-CeONRs composite coatings and their average crystalline size is ～22 nm for pure Ni and ～18 nm,respectively. The crystalline structure is fcc for the Ni-CeOnanocomposite coatings. The surface morphology of the electrodeposited Ni-CeONRs composite coatings was analyzed by scanning electron microscopy(SEM). Microhardness of pure Ni and Ni-CeONRs composite coatings are found to be 253 HV and 824 HV, respectively. The inclusion of CeONRs increases the microhardness of Ni-CeONRs composite coatings. The corrosion resistance behavior of Ni-CeONRs composite coating was evaluated by Tafel polarization and AC impedance methods. It is revealed that CeONRs reinforced Ni matrix shows higher microhardness and corrosion resistance than existing reported electrodeposited pure Ni and CeOnanoparticles reinforced Ni coatings.

关键词： CeO_2 nanorods Rare earths Electrodeposition Nanocomposite coating Microhardness

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