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https://www.readbyqxmd.com/read/28336882/antimicrobial-polymers-in-the-nano-world
#1
REVIEW
Marta Álvarez-Paino, Alexandra Muñoz-Bonilla, Marta Fernández-García
Infections are one of the main concerns of our era due to antibiotic-resistant infections and the increasing costs in the health-care sector. Within this context, antimicrobial polymers present a great alternative to combat these problems since their mechanisms of action differ from those of antibiotics. Therefore, the microorganisms' resistance to these polymeric materials is avoided. Antimicrobial polymers are not only applied in the health-care sector, they are also used in many other areas. This review presents different strategies that combine nanoscience and nanotechnology in the polymer world to combat contaminations from bacteria, fungi or algae...
February 22, 2017: Nanomaterials
https://www.readbyqxmd.com/read/28335438/the-food-production-environment-and-the-development-of-antimicrobial-resistance-in-human-pathogens-of-animal-origin
#2
REVIEW
Manjusha Lekshmi, Parvathi Ammini, Sanath Kumar, Manuel F Varela
Food-borne pathogens are a serious human health concern worldwide, and the emergence of antibiotic-resistant food pathogens has further confounded this problem. Once-highly-efficacious antibiotics are gradually becoming ineffective against many important pathogens, resulting in severe treatment crises. Among several reasons for the development and spread of antimicrobial resistance, their overuse in animal food production systems for purposes other than treatment of infections is prominent. Many pathogens of animals are zoonotic, and therefore any development of resistance in pathogens associated with food animals can spread to humans through the food chain...
March 14, 2017: Microorganisms
https://www.readbyqxmd.com/read/28331163/in-vitro-evaluation-of-candidate-bacillus-spp-for-animal-feed
#3
Sirima Mingmongkolchai, Watanalai Panbangred
The aim of this study was to select aerobic spore-formers for animal feed based on their in vitro probiotic potential, including their enzyme-producing ability and safety assessment. Seven isolates out of 187 spore-forming bacteria were selected for their ability to produce cellulase (89.21-1668.32 U/ml), xylanase (1399.68-4351.10 U/ml), and phytase (2.72-28.70 U/ml). Among seven isolates, five had activities towards a broad range of p-nitrophenyl esters with acyl chain lengths from C2 to C12. The probiotic properties of all selected isolates varied with respect to their acid and bile salt tolerance under simulated gastrointestinal tract (GIT) conditions, and their adherence ability to human intestinal cell lines (Caco-2 and HT-29)...
March 22, 2017: Journal of General and Applied Microbiology
https://www.readbyqxmd.com/read/28321211/first-foods-and-gut-microbes
#4
Martin F Laursen, Martin I Bahl, Kim F Michaelsen, Tine R Licht
The establishment of the human gut microbiota in early life has been associated with later health and disease. During the 1st months after birth, the microbial composition in the gut is known to be affected by the mode of delivery, use of antibiotics, geographical location and type of feeding (breast/formula). Consequently, the neonatal period and early infancy has attracted much attention. However, after this first period the gut microbial composition continues to develop until the age of 3 years, and these 1st years have been designated "a window of opportunity" for microbial modulation...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28316009/safety-assessment-of-commensal-enterococci-from-dogs
#5
Ivana Kubašová, Viola Strompfová, Andrea Lauková
Enterococci form a complex, diverse, and very important group of bacteria from the technological and food safety aspect, or from the health-improving aspect as probiotics. Generally, enterococci are considered to be of low pathogenic potential, which is associated mostly with clinical strains. In these strains, production of virulence factors as well as resistance to many antimicrobial drugs could complicate treatment of nosocomial infections. Because there is a lack of information on incidence of these attributes in animal commensal enterococci, we screened 160 strains originating from feces of clinically healthy dogs in Eastern Slovakia (n = 105)...
March 18, 2017: Folia Microbiologica
https://www.readbyqxmd.com/read/28314728/competitive-exclusion-reduces-transmission-and-excretion-of-extended-spectrum-%C3%AE-lactamase-producing-escherichia-coli-in-broilers
#6
Daniela Ceccarelli, Alieda van Essen-Zandbergen, Bregtje Smid, Kees T Veldman, Gert Jan Boender, Egil A J Fischer, Dik J Mevius, Jeanet A van der Goot
Extended-spectrum β-lactamases (ESBLs) and plasmid mediated AmpC β-lactamases (pAmpC) are enzymes able to hydrolyze a large variety of β-lactam antibiotics, including 3(rd) generation cephalosporins and monobactams. Broilers and broiler meat products can be highly contaminated with ESBL and pAmpC-producing Escherichia coli, also known as extended-spectrum cephalosporins (ESC)-resistant E. coli, and can be a source for human infections. As few data are available on interventions to reduce ESC-resistant E...
March 17, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/28300643/draft-genome-sequence-of-multidrug-resistant-salmonella-enterica-serovar-brancaster-strain-ps01-isolated-from-chicken-meat-malaysia
#7
Pui San Chin, Choo Yee Yu, Geik Yong Ang, Wai-Fong Yin, Kok-Gan Chan
OBJECTIVES: Salmonella spp. represent one of the main diarrhoeal pathogens that are transmitted via the food supply chain. Here we report the draft genome sequence of a multidrug-resistant Salmonella enterica serovar Brancaster (PS01) that was isolated from poultry meat in Malaysia. METHODS: Genomic DNA was extracted from Salmonella strain PS01 and was sequenced using an Illumina HiSeq 2000 platform. The generated reads were de novo assembled using CLC Genomics Workbench...
March 11, 2017: Journal of Global Antimicrobial Resistance
https://www.readbyqxmd.com/read/28293865/the-inhibition-effect-of-lactobacilli-against-growth-and-biofilm-formation-of-pseudomonas-aeruginosa
#8
Dariush Shokri, Mohammad Rabbani Khorasgani, Milad Mohkam, Seyed Masih Fatemi, Younes Ghasemi, Asghar Taheri-Kafrani
The emergence of antibiotic-resistant and food-spoilage microorganisms has renewed efforts to identify safe and natural alternative agents of antibiotics such as probiotics. The aim of this study was the isolation of lactobacilli as potential probiotics from local dairy products with broad antibacterial and anti-biofilm activities against antibiotic-resistant strains of Pseudomonas aeruginosa and determination of their inhibition mechanism. Antibiotic susceptibility and classification of acquired resistance profiles of 80 P...
March 14, 2017: Probiotics and Antimicrobial Proteins
https://www.readbyqxmd.com/read/28293682/genome-sequence-of-the-thermotolerant-foodborne-pathogen-salmonella-enterica-serovar-senftenberg-atcc-43845-and-phylogenetic-analysis-of-loci-encoding-increased-protein-quality-control-mechanisms
#9
Scott V Nguyen, Gregory P Harhay, James L Bono, Timothy P L Smith, Dayna M Harhay
Salmonella enterica subsp. enterica bacteria are important foodborne pathogens with major economic impact. Some isolates exhibit increased heat tolerance, a concern for food safety. Analysis of a finished-quality genome sequence of an isolate commonly used in heat resistance studies, S. enterica subsp. enterica serovar Senftenberg 775W (ATCC 43845), demonstrated an interesting observation that this strain contains not just one, but two horizontally acquired thermotolerance locus homologs. These two loci reside on a large 341...
January 2017: MSystems
https://www.readbyqxmd.com/read/28291385/determination-of-oxytetracycline-and-4-epi-oxytetracycline-residues-in-feathers-and-edible-tissues-of-broiler-chickens-using-liquid-chromatography-coupled-with-tandem-mass-spectrometry
#10
Javiera Cornejo, Ekaterina Pokrant, Magdalena Krogh, Cristóbal Briceño, Héctor Hidalgo, Aldo Maddaleno, Carolina Araya-Jordán, Betty San Martín
Antibiotics have been widely used in poultry production for the treatment of bacterial diseases. However, drug residues can remain in products derived from animals after the cessation of the drug therapies. Feathers, in particular, have shown an affinity for antibiotics such as tetracycline, suggesting the persistence of these drugs in nonedible tissue. After the birds are slaughtered, feathers are ground into feather meals, which are used as organic fertilizer or an ingredient in animal diets, thereby entering into the food chain and becoming a potential risk for public health...
March 14, 2017: Journal of Food Protection
https://www.readbyqxmd.com/read/28290091/collection-of-mullet-fish-mugil-cephalus-from-west-coast-of-india-evaluation-of-its-quality-with-relation-to-food-safety
#11
Ishan H Raval, Keshob C Das, Soumya Haldar
The present study focuses on bacterial and selected heavy metal contaminations of economically important mullet fish (Mugil cephalus) collected from West coast of Gujarat, India. Molecular identification using 16S rRNA sequencing revealed the presence of Aeromonas veronii, A. mollusorum, A. cavae, A. bivalvum, and V.alginolyticus in the gill and the intestine along with some other non-pathogenic bacteria. Pathogenicity of different Aeromonas species was confirmed by hemolysin assay. Apart from pathogenicity, multidrug resistance pattern was also reported against some commonly used antibiotics...
March 14, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28288581/prevalence-virulence-factor-genes-and-antibiotic-resistance-of-bacillus-cereus-sensu-lato-isolated-from-dairy-farms-and-traditional-dairy-products
#12
James Owusu-Kwarteng, Alhassan Wuni, Fortune Akabanda, Kwaku Tano-Debrah, Lene Jespersen
BACKGROUND: B. cereus are of particular interest in food safety and public health because of their capacity to cause food spoilage and disease through the production of various toxins. The aim of this study was to determine the prevalence, virulence factor genes and antibiotic resistance profile of B. cereus sensu lato isolated from cattle grazing soils and dairy products in Ghana. A total of 114 samples made up of 25 soil collected from cattle grazing farm land, 30 raw milk, 28 nunu (yoghurt-like product) and 31 woagashie (West African soft cheese)...
March 14, 2017: BMC Microbiology
https://www.readbyqxmd.com/read/28287715/a-dual-recognition-fret-based-platform-for-one-step-sensitive-detection-of-pathogenic-bacteria-using-fluorescent-vancomycin-gold-nanoclusters-and-aptamer-gold-nanoparticles
#13
Mengqun Yu, Hong Wang, Fei Fu, Linyao Li, Jing Li, Gan Li, Yang Song, Mark T Swihart, Erqun Song
The effective monitoring, identification, and quantification of pathogenic bacteria is essential for addressing serious public health issues. In this study, we present a universal and facile one-step strategy for sensitive and selective detection of pathogenic bacteria using a dual molecular affinity-based Förster (fluorescence) resonance energy transfer (FRET) platform based on the recognition of bacterial cell walls by antibiotic and aptamer molecules, respectively. As a proof of concept, Vancomycin (Van), and a nucleic acid aptamer were employed in a model dual recognition scheme for detecting Staphylococcus aureus (S...
March 13, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28286570/strain-specific-probiotic-properties-of-lactic-acid-bacteria-and-their-interference-with-human-intestinal-pathogens-invasion
#14
Raffaella Campana, Saskia van Hemert, Wally Baffone
BACKGROUND: One of the working mechanisms of probiotic bacteria is their ability to compete with pathogens. To define the probiotic properties of seven Lactic Acid Bacteria (LAB) strains, we tested them for survival in simulated gastro-intestinal conditions, antimicrobial activities, co-aggregative abilities, and interferences studies against five human intestinal pathogens (Salmonella enteritidis ATCC 13076, Listeria monocytogenes ATCC 7644, Escherichia coli O157: H7 ATCC 35150, Cronobacter sakazakii ATCC 29544 and Campylobacter jejuni ATCC 33291)...
2017: Gut Pathogens
https://www.readbyqxmd.com/read/28285658/competition-assays-revealed-paenibacillus-pasadenensis-strain-r16-as-a-novel-antifungal-agent
#15
Alessandro Passera, Giovanni Venturini, Giovanna Battelli, Paola Casati, Francesca Penaca, Fabio Quaglino, Piero Attilio Bianco
The development of new sustainable containment strategies of plant diseases is very important to guarantee food security while reducing the environmental impact of agriculture. Research of new biocontrol agents is a long and difficult process that involves several steps that start from the identification of possible candidates which, for example, show antibiotic activities, and ends with in field, large scale trials. In this study, the plant growth promoting potential and antifungal effect exerted by a novel, putative candidate biocontrol agent, strain R16, identified as Paenibacillus pasadenensis by sequence analysis of 16S rRNA and rpoB genes, against three important plant pathogenic fungi (Botrytis cinerea, Fusarium verticillioides, and Phomopsis viticola), were assessed...
May 2017: Microbiological Research
https://www.readbyqxmd.com/read/28285374/antibiotic-mixture-effects-on-growth-of-the-leaf-shredding-stream-detritivore-gammarus-fossarum
#16
Mirco Bundschuh, Torsten Hahn, Mark O Gessner, Ralf Schulz
Pharmaceuticals contribute greatly to human and animal health. Given their specific biological targets, pharmaceuticals pose a significant environmental risk by affecting organisms and ecosystem processes, including leaf-litter decomposition. Although litter decomposition is a central process in forest streams, the consequences of exposure to pharmaceuticals remain poorly known. The present study assessed the impact of antibiotics as an important class of pharmaceuticals on the growth of the leaf-shredding amphipod Gammarus fossarum over 24 days...
March 11, 2017: Ecotoxicology
https://www.readbyqxmd.com/read/28284554/effects-of-biochar-on-reducing-the-abundance-of-oxytetracycline-antibiotic-resistance-genes-and-human-pathogenic-bacteria-in-soil-and-lettuce
#17
Manli Duan, Haichao Li, Jie Gu, Xiaxia Tuo, Wei Sun, Xun Qian, Xiaojuan Wang
Antibiotics and antibiotic resistance genes (ARGs) in soil can affect human health via the food chain. Biochar is a soil amendment but its impacts on ARGs and the microbial communities associated with soil and vegetables are unclear. Therefore, we established three lettuce pot culture experiments, i.e., O300: 300 mg/kg oxytetracycline (OTC), BO300: 300 mg/kg OTC + 2% biochar, and a control without OTC or biochar. We found that under BO300, the relative abundances of ARGs were reduced by 51.8%, 43.4%, and 44...
March 8, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28283872/screening-food-borne-and-zoonotic-pathogens-associated-with-livestock-practices-in-the-sumapaz-region-cundinamarca-colombia
#18
Nelson E Arenas, Diego A Abril, Paola Valencia, Surabhi Khandige, Carlos Yesid Soto, Vilma Moreno-Melo
Hazardous practices regarding antibiotics misuse, unsanitary milking procedures, and the commercial sales of raw milk and unpasteurized dairy products are currently being practiced by livestock farmers in the Sumapaz region (Colombia). The purpose of this study was to screen for food-borne and zoonotic pathogens associated with local livestock practices. We evaluated 1098 cows from 46 livestock farms in the Sumapaz region that were selected by random. Of the total population of cattle, 962 animals (88%) were tested for bovine TB using a caudal-fold tuberculin test and 546 (50%) for brucellosis by a competitive ELISA...
March 11, 2017: Tropical Animal Health and Production
https://www.readbyqxmd.com/read/28277085/detection-of-class-i-and-ii-integrons-for-the-assessment-of-antibiotic-and-multidrug-resistance-among-escherichia-coli-isolates-from-agricultural-irrigation-waters-in-bulacan-philippines
#19
Cielo Emar M Paraoan, Windell L Rivera, Pierangeli G Vital
Contaminated irrigation water may greatly affect not only the quality of produce but also the people exposed to it. In this study, agricultural irrigation waters in Bulacan, Philippines were assessed and found to be contaminated with Escherichia coli (E. coli) ranging from 0.58 to 4.51 log10 CFU/mL. A total of 79 isolates of E. coli were confirmed through polymerase chain reaction (PCR) amplifying the uidA gene and were tested for phenotypic resistance using 10 antimicrobials through the Kirby-Bauer disc diffusion method...
February 10, 2017: Journal of Environmental Science and Health. Part. B, Pesticides, Food Contaminants, and Agricultural Wastes
https://www.readbyqxmd.com/read/28274457/detection-of-kanamycin-and-gentamicin-residues-in-animal-derived-food-using-igy-antibody-based-ic-elisa-and-fpia
#20
Cui Li, Yaoyao Zhang, Sergei A Eremin, Omar Yakup, Gang Yao, Xiaoying Zhang
Our aim in this study is to show that IgY antibody based immunoassays could be used to detect antibiotic residues in animal-derived food. Briefly, full antigens of gentamicin (Gent) and kanamycin (Kana) were used to immunize the laying chickens to prepare IgY antibodies. Then, these antibodies were evaluated by FPIA and ic-ELISA to detect Gent/Kana in animal-derived samples. The IC50 of FPIA and ic-ELISA based anti-Gent IgY were 7.70±0.6μg/mL and 0.32±0.06μg/mL, respectively. The IC50 of FPIA and ic-ELISA based anti-Kana IgY were 7...
July 15, 2017: Food Chemistry
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