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https://www.readbyqxmd.com/read/28231152/antimicrobial-active-packaging-including-chitosan-films-with-thymus-vulgaris-l-essential-oil-for-ready-to-eat-meat
#1
Jesús Quesada, Esther Sendra, Casilda Navarro, Estrella Sayas-Barberá
An active packaging system has been designed for the shelf life extension of ready to eat meat products. The package included an inner surface coated with a chitosan film with thyme essential oil (0%, 0.5%, 1%, and 2%) not in direct contact with the meat. Our aim was to reduce the impact of thyme essential oil (EO) on meat sensory properties by using a chemotype with low odor intensity. The pH, color parameters, microbial populations, and sensory properties were assessed during 4 weeks of refrigerated storage...
August 29, 2016: Foods (Basel, Switzerland)
https://www.readbyqxmd.com/read/28226251/effects-of-sulfate-on-heavy-metal-release-from-iron-corrosion-scales-in-drinking-water-distribution-system
#2
Huifang Sun, Baoyou Shi, Fan Yang, Dongsheng Wang
Trace heavy metals accumulated in iron corrosion scales within a drinking water distribution system (DWDS) could potentially be released to bulk water and consequently deteriorate the tap water quality. The objective of this study was to identify and evaluate the release of trace heavy metals in DWDS under changing source water conditions. Experimental pipe loops with different iron corrosion scales were set up to simulate the actual DWDS. The effects of sulfate levels on heavy metal release were systemically investigated...
February 13, 2017: Water Research
https://www.readbyqxmd.com/read/28225595/colorimetric-and-electrochemical-bacteria-detection-using-printed-paper-and-transparency-based-analytic-devices
#3
Jaclyn A Adkins, Katherine Boehle, Colin Friend, Briana Chamberlain, Bledar Bisha, Charles S Henry
The development of transparency-based electrochemical and paper-based colorimetric analytic detection platforms is presented as complimentary methods for food and waterborne bacteria detection from a single assay. Escherichia coli and Enterococcus species, both indicators of fecal contamination, were detected using substrates specific to enzymes produced by each species. β-galactosidase (β-gal) and β-glucosidase (β-gluco) are both produced by E. coli, while β-glucosidase (β-gluco) is produced by Enterococcus spp...
February 22, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28223979/broadcast-spawning-coral-mussismilia-hispida-can-vertically-transfer-its-associated-bacterial-core
#4
Deborah C A Leite, Pedro Leão, Amana G Garrido, Ulysses Lins, Henrique F Santos, Débora O Pires, Clovis B Castro, Jan D van Elsas, Carla Zilberberg, Alexandre S Rosado, Raquel S Peixoto
The hologenome theory of evolution (HTE), which is under fierce debate, presupposes that parts of the microbiome are transmitted from one generation to the next [vertical transmission (VT)], which may also influence the evolution of the holobiont. Even though bacteria have previously been described in early life stages of corals, these early life stages (larvae) could have been inoculated in the water and not inside the parental colony (through gametes) carrying the parental microbiome. How Symbiodinium is transmitted to offspring is also not clear, as only one study has described this mechanism in spawners...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28222375/on-site-nutrient-recovery-and-removal-from-source-separated-urine-by-phosphorus-precipitation-and-short-cut-nitrification-denitrification
#5
Song Yao, Liping Chen, Detian Guan, Zhongguo Zhang, Xiujun Tian, Aimin Wang, Guotian Wang, Qian Yao, Dangcong Peng, Jiuyi Li
Source separation and treatment of human urine have been recognized as a resource-efficient alternative to conventional urban drainage, not only reducing nutrient loads on municipal wastewater treatment plants, but recovering valuable resources from waste streams. In this work, on-site phosphorus (P) recovery from real urine was carried out by using the brine from a reverse osmosis process as the flush water for urine-diverting toilets and a P precipitant, while nitrogen (N) was removed via short-cut nitrification-denitrification (SCND) in a membrane bioreactor (MBR)...
February 16, 2017: Chemosphere
https://www.readbyqxmd.com/read/28221955/synergistic-effect-of-freezing-and-irradiation-on-bonito-fish-sarda-sarda-bloch-1793
#6
Can Okan Altan, Hülya Turan
In this study, bonito fish ( Sarda sarda Bloch, 1793) were irradiated at 3 or 5 kGy, packaged, frozen, and stored at -20 ± 2°C for 12 months. During storage, the microbiological, physical, and chemical changes of the fish flesh were then assessed. Increasing the irradiation dose to 5 kGy provided greater inhibition of mesophilic and psychotropic aerobic bacteria (P < 0.05). Because fewer bacteria were detected in irradiated (3 and 5 kGy) as compared with unirradiated control fish suggests that freezing and irradiation yielded better results when combined...
December 2016: Journal of Food Protection
https://www.readbyqxmd.com/read/28221949/growth-of-escherichia-coli-o157-h7-non-o157-shiga-toxin-producing-escherichia-coli-and-salmonella-in-water-and-hydroponic-fertilizer-solutions
#7
Angela Shaw, Kara Helterbran, Michael R Evans, Christopher Currey
The desire for local, fresh produce year round is driving the growth of hydroponic growing systems in the United States. Many food crops, such as leafy greens and culinary herbs, grown within hydroponics systems have their root systems submerged in recirculating nutrient-dense fertilizer solutions from planting through harvest. If a foodborne pathogen were introduced into this water system, the risk of contamination to the entire crop would be high. Hence, this study was designed to determine whether Escherichia coli O157:H7, non-O157 Shiga toxin-producing E...
December 2016: Journal of Food Protection
https://www.readbyqxmd.com/read/28221924/reductions-in-natural-microbial-flora-nonpathogenic-escherichia-coli-and-pathogenic-salmonella-on-jalapeno-peppers-processed-in-a-commercial-antimicrobial-cabinet-a-pilot-plant-trial
#8
Jeremy M Adler, Erin D Cain-Helfrich, Cangliang Shen
This experiment aimed to validate the use of antimicrobial solutions in a spray cabinet to inactivate natural microbial flora, nonpathogenic Escherichia coli , and Salmonella on jalapeno peppers. Jalapeno peppers, uninoculated or inoculated with a five-strain mixture of rifampin-resistant E. coli (3.9 log CFU/g) or novobiocin- and nalidixic acid-resistant Salmonella (4.2 log CFU/g), were passed through a commercial antimicrobial cabinet containing both a top and bottom bar spraying (1.38 bar and 2 liters/min) water, sodium hypochlorite (50 ppm), sodium hypochlorite with pH adjusted to 6...
November 2016: Journal of Food Protection
https://www.readbyqxmd.com/read/28221910/influence-of-thawing-methods-and-storage-temperatures-on-bacterial-diversity-growth-kinetics-and-biogenic-amine-development-in-atlantic-mackerel
#9
S Onyango, H Palmadottir, T Tómason, V T Marteinsson, P M K Njage, E Reynisson
Limited knowledge is currently available on the influence of fish thawing and subsequent storage conditions on bacterial growth kinetics, succession, and diversity alongside the production of biogenic amines. This study aimed to address these factors during the thawing and subsequent storage of mackerel. Thawing was either done fast in 18°C water for 2 h or slowly at 30°C overnight. Subsequent storage was at 30°C (ambient) for 36 h and 2 to 5°C (refrigerated) for 12 days. The cultivation methods used were total viable counts, hydrogen sulfide-producing bacteria, and Pseudomonas ...
November 2016: Journal of Food Protection
https://www.readbyqxmd.com/read/28221888/histamine-formation-in-a-dry-salted-twaite-shad-alosa-fallax-lacustris-product
#10
Mauro Vasconi, Federica Bellagamba, Cristian Bernardi, Piera Anna Martino, Vittorio Maria Moretti
Landlocked shad is a freshwater clupeid fish ( Alosa fallax lacustris ) whose consumption is associated with the risk of scombrotoxin poisoning. Traditionally, fresh shad are subjected to an artisanal processing procedure, consisting of dry salting and maturation under pressure, to give a fish product named missoltino , which is stored in large metallic barrels and is sold to local consumers and restaurants. In recent years, the introduction of modern food packaging technologies has enabled this product to also be distributed in shops and supermarkets...
January 2017: Journal of Food Protection
https://www.readbyqxmd.com/read/28221887/soil-type-soil-moisture-and-field-slope-influence-the-horizontal-movement-of-salmonella-enterica-and-citrobacter-freundii-from-floodwater-through-soil
#11
Mary Theresa Callahan, Shirley A Micallef, Robert L Buchanan
Pathogens in soil are readily mobilized by infiltrating water to travel downward through the soil. However, limited data are available on the horizontal movement of pathogens across a field. This study used a model system to evaluate the influence of soil type, initial soil moisture content, and field slope on the movement of Salmonella enterica serovar Newport across a horizontal plane of soil under flooding conditions. Three soil types of varying clay content were moistened to 40, 60, or 80% of their maximum water-holding capacities and flooded with water containing 6 log CFU/ml Salmonella Newport and Citrobacter freundii , the latter being evaluated as a potential surrogate for S...
January 2017: Journal of Food Protection
https://www.readbyqxmd.com/read/28221885/antibacterial-and-antiadhesive-activities-of-extracts-from-edible-plants-against-soft-drink-spoilage-by-asaia-spp
#12
Hubert Antolak, Agata Czyzowska, Dorota Kregiel
This study was conducted to investigate the antibacterial and antiadhesive activities of ethanol extracts from five edible plant parts: cinnamon bark ( Cinnamomum zeylanicum ), licorice root ( Glycyrrhiza radix ), nettle leaves ( Urtica dioica ), green tea leaves ( Camellia sinensis ), and elderberry flowers ( Sambucus nigra ). The chemical constituents of the extracts were identified using high-performance liquid chromatography and liquid chromatography plus mass spectrometry. Six strains of Asaia lannensis and Asaia bogorensis bacteria isolated from spoiled commercial fruit-flavored noncarbonated mineral water were used...
January 2017: Journal of Food Protection
https://www.readbyqxmd.com/read/28221856/enumeration-and-identification-of-coliform-bacteria-injured-by-chlorine-or-fungicide-mixed-with-agricultural-water
#13
Hidemi Izumi, Yuji Nakata, Ayano Inoue
Chemical sanitizers may induce no injury (bacteria survive), sublethal injury (bacteria are injured), or lethal injury (bacteria die). The proportion of coliform bacteria that were injured sublethally by chlorine and fungicide mixed with agricultural water (pond water), which was used to dilute the pesticide solution, was evaluated using the thin agar layer (TAL) method. In pure cultures of Enterobacter cloacae , Escherichia coli , and E. coli O157:H7 (representing a human pathogen), the percentage of chlorine-injured cells was 69 to 77% for dilute electrolyzed water containing an available chlorine level of 2 ppm...
October 2016: Journal of Food Protection
https://www.readbyqxmd.com/read/28221855/survival-kinetics-of-salmonella-enterica-and-enterohemorrhagic-escherichia-coli-on-a-plastic-surface-at-low-relative-humidity-and-on-low-water-activity-foods
#14
Hidekazu Hokunan, Kento Koyama, Mayumi Hasegawa, Shuso Kawamura, Shigenobu Koseki
We investigated the survival kinetics of Salmonella enterica and enterohemorrhagic Escherichia coli under various water activity (aw) conditions to elucidate the net effect of aw on pathogen survival kinetics and to pursue the development of a predictive model of pathogen survival as a function of aw. Four serotypes of S. enterica (Stanley, Typhimurium, Chester, and Oranienburg) and three serotypes of enterohemorrhagic E. coli ( E. coli O26, E. coli O111, and E. coli O157:H7) were examined. These bacterial strains were inoculated on a plastic plate surface at a constant relative humidity (RH) (22, 43, 58, 68, or 93% RH, corresponding to the aw) or on a surface of almond kernels (aw 0...
October 2016: Journal of Food Protection
https://www.readbyqxmd.com/read/28221846/fate-of-pathogenic-bacteria-associated-with-production-of-pickled-sausage-by-using-a-cold-fill-process
#15
Nelson J Gaydos, Catherine N Cutter, Jonathan A Campbell
Preservation by pickling has been used for many years to extend the shelf life of various types of food products. By storing meat products in a brine solution containing an organic acid, salt, spices, as well as other preservatives, the pH of the product is reduced, thus increasing the safety and shelf life of the product. Pickling may involve the use of heated brines to further add to the safety of the food product. When precooked, ready-to-eat (RTE) sausages are pickled with a heated brine solution, the process is referred to as hot filling...
October 2016: Journal of Food Protection
https://www.readbyqxmd.com/read/28221026/nanomechanics-of-ph-responsive-drug-loaded-bi-layered-polymer-grafts
#16
Prathima Chandra Nalam, Hyun-Su Lee, Nupur Bhatt, Robert W Carpick, David M Eckmann, Russell J Composto
Stimuli-responsive polymer films play an important role in the development of smart antibacterial coatings. In this study, we consider complementary architectures of polyelectrolyte films including a thin chitosan layer (CH), poly (acrylic acid) (PAA) brushes and a bilayer structure of CH grafted to PAA brushes (CH/PAA) as possible candidates for targeted drug delivery platforms. Atomic force microscopy (AFM) was employed to study the structure-mechanical property relationship for these mono- and bi- layered polymer grafts at pH 7...
February 21, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28220111/identity-abundance-and-reactivation-kinetics-of-thermophilic-fermentative-endospores-in-cold-marine-sediment-and-seawater
#17
Marta Volpi, Bente Aa Lomstein, Andreas Sichert, Hans Røy, Bo B Jørgensen, Kasper U Kjeldsen
Cold marine sediments harbor endospores of fermentative and sulfate-reducing, thermophilic bacteria. These dormant populations of endospores are believed to accumulate in the seabed via passive dispersal by ocean currents followed by sedimentation from the water column. However, the magnitude of this process is poorly understood because the endospores present in seawater were so far not identified, and only the abundance of thermophilic sulfate-reducing endospores in the seabed has been quantified. We investigated the distribution of thermophilic fermentative endospores (TFEs) in water column and sediment of Aarhus Bay, Denmark, to test the role of suspended dispersal and determine the rate of endospore deposition and the endospore abundance in the sediment...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28217979/enantioseparation-of-3-phenyllactic-acid-by-chiral-ligand-exchange-countercurrent-chromatography
#18
Shengqiang Tong, Xiaoping Wang, Mangmang Shen, Liqiong Lv, Mengxia Lu, Zhisi Bu, Jizhong Yan
3-Phenyllactic acid is an antimicrobial compound with broad-spectrum activity against various bacteria and fungus. The observed difference in pharmacological activity between optical isomeric 3-phenyllactic acid necessitates a method for enantioseparation. Chiral ligand exchange countercurrent chromatography was investigated for the enantioseparation of 3-phenyllactic acid with a synthesized chiral ligand. A two-phase solvent system was composed of n-butanol/hexane/water (0.4:0.6:1, v/v/v) to which N-n-dodecyl-l-hydroxyproline was added to the organic phase as chiral ligand and cupric acetate was added in the aqueous phase as a transitional metal ion...
February 20, 2017: Journal of Separation Science
https://www.readbyqxmd.com/read/28217926/reduction-oxidation-cycles-of-organic-matter-increase-bacterial-activity-in-the-pelagic-oxycline
#19
Maximilian P Lau, Michael Hupfer, Hans Peter Grossart
Dissolved organic matter (DOM) in aquatic ecosystems contains redox-active moieties, which are prone to oxidation and reduction reactions. Oxidized moieties feature reduction potentials Eh , so that the moieties may be used as terminal electron acceptors (TEAs) in microbial respiration with a thermodynamic energy yield between nitrate and sulfate reduction. Here, we study the response of pelagic freshwater bacteria to exposure to native DOM with varying availabilities of oxidized moieties and hence redox state...
February 20, 2017: Environmental Microbiology Reports
https://www.readbyqxmd.com/read/28217877/high-resolution-sequencing-reveals-unexplored-archaeal-diversity-in-freshwater-wetland-soils
#20
Adrienne B Narrowe, Jordan C Angle, Rebecca A Daly, Kay C Stefanik, Kelly C Wrighton, Christopher S Miller
Despite being key contributors to biogeochemical processes, archaea are frequently outnumbered by bacteria, and consequently are underrepresented in combined molecular surveys. Here, we demonstrate an approach to concurrently survey the archaea alongside the bacteria with high-resolution 16S rRNA gene sequencing, linking these community data to geochemical parameters. We applied this integrated analysis to hydric soils sampled across a model methane-emitting freshwater wetland. Geochemical profiles, archaeal communities, and bacterial communities were independently correlated with soil depth and water cover...
February 20, 2017: Environmental Microbiology
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