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Disinfection by-product

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https://www.readbyqxmd.com/read/29678741/identification-and-characterization-of-an-endolysin-like-from-bacillus-subtilis
#1
Hossein Noormohammdi, Shamsozoha Abolmaali, Shakiba Darvish Alipour Astaneh
Drug-resistant Gram-positive pathogens have been a rising risk in hospitals and food industries from the last decades. Here in, the potential of endolysin production in Dasht Desert Bacterial Culture Collection (DDBCC), against indicator bacteria, was investigated. DDBCC was screened against autoclaved-indicator bacteria; Streptococcus faecalis, Streptococcus pyogenes, Bacillus sp, Bacillus subtilis and Staphylococcus aureus as the substrates for the endolysin enzymes. The endolysins were produced in BHI medium followed by ammonium sulfate purification...
April 17, 2018: Microbial Pathogenesis
https://www.readbyqxmd.com/read/29676755/drinking-water-disinfection-by-products-exposure-and-health-effects-on-pregnancy-outcomes-a-systematic-review
#2
Funanani Mashau, Esper Jacobeth Ncube, Kuku Voyi
Epidemiological studies have found that maternal exposure to disinfection by-products (DBPs) may lead to adverse pregnancy outcomes although the findings tend to be inconsistent. The objective of this study was to systematically review the evidence in associated with drinking water DBP exposure in relation to adverse pregnancy outcomes. Peer-reviewed articles were identified using electronic databases searched for studies published in the English language. Studies selected for review were evaluated for exposure assessment, confounders, and analyses risks of bias in the selection, outcomes assessment, and attrition...
April 2018: Journal of Water and Health
https://www.readbyqxmd.com/read/29672032/oxidation-processes-in-water-treatment-are-we-on-track
#3
Urs von Gunten
Chemical oxidants have been applied in water treatment for more than a century, first as disinfectants and later to abate inorganic and organic contaminants. The challenge of oxidative abatement of organic micropollutants is the formation of transformation products with unknown (eco)toxicological consequences. Four aspects need to be considered for oxidative micropollutant abatement: (i) Reaction kinetics, controlling the efficiency of the process, (ii) mechanisms of transformation product formation, (iii) extent of formation of disinfection byproducts from the matrix, (iv) oxidation induced biological effects, resulting from transformation products and/or disinfection byproducts...
April 19, 2018: Environmental Science & Technology
https://www.readbyqxmd.com/read/29668034/response-of-formed-biofilm-of-enterobacter-cloacae-klebsiella-oxytoca-and-citrobacter-freundii-to-chlorite-based-disinfectants
#4
Linlin Cai, Huawei Wang, Lijiao Liang, Guangyu Wang, Xinglian Xu, Huhu Wang
Bacterial biofilms formed on equipment surfaces are potential sources of cross-contamination and can be responsible for the spread of bacteria involved in food spoilage, such as some Enterobacteriaceae family members. In this study, the effect of chlorite-based disinfectants, including sodium hypochlorite (SH), chlorine dioxide (CD), strongly acidic electrolyzed water (StAEW), and neutral electrolyzed water (NEW), on inactivation of mono-biofilms of Enterobacter cloacae, Klebsiella oxytoca, and Citrobacter freundii was evaluated separately...
April 18, 2018: Journal of Food Science
https://www.readbyqxmd.com/read/29666613/novel-biocontrol-methods-for-listeria-monocytogenes-biofilms-in-food-production-facilities
#5
REVIEW
Jessica A Gray, P Scott Chandry, Mandeep Kaur, Chawalit Kocharunchitt, John P Bowman, Edward M Fox
High mortality and hospitalization rates have seen Listeria monocytogenes as a foodborne pathogen of public health importance for many years and of particular concern for high-risk population groups. Food manufactures face an ongoing challenge in preventing the entry of L. monocytogenes into food production environments (FPEs) due to its ubiquitous nature. In addition to this, the capacity of L. monocytogenes strains to colonize FPEs can lead to repeated identification of L. monocytogenes in FPE surveillance...
2018: Frontiers in Microbiology
https://www.readbyqxmd.com/read/29660283/genotoxicity-assessment-of-drinking-water-disinfection-by-products-dbps-by-dna-damage-and-repair-pathway-profiling-analysis
#6
Jiaqi Lan, Sheikh Mokhlesur Rahman, Na Gou, Tao Jiang, Michael J Plewa, Akram Alshawabkeh, April Z Gu
Genotoxicity is considered the major concern for drinking water disinfection by-products (DBPs). Of over 700 DBPs identified to date, only a small number of has been assessed with limited information for DBP genotoxicity mechanism(s). In this study we evaluated genotoxicity of 20 regulated and un-regulated DBPs applying a quantitative toxicogenomics approach. We used GFP-fused yeast strains that examine protein expression profiling of 38 proteins indicative of all known DNA damage and repair pathways. The toxicogenomics assay detected genotoxicity potential of these DBPs in consistent with conventional genotoxicity assays endpoints...
April 16, 2018: Environmental Science & Technology
https://www.readbyqxmd.com/read/29652814/health-risk-assessment-on-hazardous-ingredients-in-household-deodorizing-products
#7
Minjin Lee, Joo-Hyon Kim, Daeyeop Lee, Jaewoo Kim, Hyunwoo Lim, Jungkwan Seo, Young-Kwon Park
The inhalation of a water aerosol from a humidifier containing disinfectants has led to serious lung injuries in Korea. To promote the safe use of products, the Korean government enacted regulations on the chemicals in various consumer products that could have adverse health effects. Given the concern over the potential health risks associated with the hazardous ingredients in deodorizing consumer products, 17 ingredients were analyzed and assessed according to their health risk on 3 groups by the application type in 47 deodorizing products...
April 13, 2018: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/29628093/anaerobic-treatment-of-source-separated-domestic-bio-wastes-with-an-improved-upflow-solid-reactor-at-a-short-hrt
#8
Hongliang Wang, Shikun Zhu, Bo Qu, Yu Zhang, Bin Fan
Anaerobic treatment is the core technology for resource and energy recovery from source-separated domestic bio-wastes. The higher efficiency of an improved upflow solid reactor (IUSR) designed in this study was demonstrated in the treatment of concentrated black water and kitchen waste. The highest methane production of 48L/person/day was achieved at the hydraulic retention time (HRT) of 7days, while the other measures of performance at the HRT of 8.3days were better than at the HRT of 7 or 10days, achieving a methane production of 43L/person/day, removal of total chemical oxygen demand (TCOD) of 89%, removal of soluble chemical oxygen demand (SCOD) of 92%, and conversion of chemical oxygen demand (COD) to methane of 71%...
April 2018: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/29626332/benzalkonium-chloride-tolerance-of-listeria-monocytogenes-strains-isolated-from-a-meat-processing-facility-is-related-to-presence-of-plasmid-borne-bcrabc-cassette
#9
Jana Minarovičová, Adriana Véghová, Mária Mikulášová, Romana Chovanová, Katarína Šoltýs, Hana Drahovská, Eva Kaclíková
Listeria monocytogenes is a serious foodborne pathogen capable of persisting in food processing environments. Tolerance to disinfectants used in industrial settings constitutes an important factor of Listeria survival. In the present study, the mechanism of tolerance to benzalkonium chloride (BAC) was investigated in 77 L. monocytogenes isolates from a meat facility. By PCR approach, the mdrL and lde chromosomal efflux pump genes were detected in all isolates. No isolate was positive for qacH and emrE genes...
April 6, 2018: Antonie Van Leeuwenhoek
https://www.readbyqxmd.com/read/29625987/efficacy-of-silver-dihydrogen-citrate-and-steam-vapor-against-a-human-norovirus-surrogate-feline-calicivirus-in-suspension-on-glass-and-carpet
#10
David Buckley, Muthu Dharmasena, Angela Fraser, Charles Pettigrew, Jeffery Anderson, Xiuping Jiang
Carpets and other soft surfaces have been associated with prolonged and reoccurring human norovirus (HuNoV) outbreaks. Environmental hygiene programs are important to prevent and control HuNoV outbreaks. Despite our knowledge of HuNoV transmission via soft surfaces, no commercially available disinfectants have been evaluated on carpets. Our aim was to adapt a current standardized method for virucidal testing by assessing two disinfection technologies, silver dihydrogen citrate (SDC) and steam vapor, against one HuNoV surrogate, feline calicivirus (FCV), on wool and nylon carpets...
April 6, 2018: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/29625097/chloroquine-as-a-possible-disinfection-adjunct-of-disinfection-solutions-against-acanthamoeba
#11
Eun-Kyung Moon, Seungeun Lee, Fu-Shi Quan, Hyun-Hee Kong
Acanthamoeba keratitis is commonly encountered by contact lens wearers. Contact lens solution plays an important role in the safe use of contact lenses. The most popular products for disinfecting lenses are multipurpose disinfecting solutions (MPDS). However, almost all MPDS retailed in Korea are ineffective in killing Acanthamoeba. The objective of this study was to determine the possibility of using autophagy inhibitor chloroquine as a disinfecting agent to improve the amoebicidal activity of MPDS against Acanthamoeba, especially the cyst...
April 3, 2018: Experimental Parasitology
https://www.readbyqxmd.com/read/29621162/toxic-effects-of-bisphenol-a-propyl-paraben-and-triclosan-on-caenorhabditis-elegans
#12
María Cecilia García-Espiñeira, Lesly Patricia Tejeda-Benítez, Jesus Olivero-Verbel
Bisphenol A (BPA) is a ubiquitous plasticizer which is absorbed by ingestion and dermal contact; propyl paraben (PPB) inhibits the microbiome and extends the shelf life of many personal care products, whereas triclosan (TCS) is commonly found in antiseptics, disinfectants, or additives. In this work, Caenorhabditis elegans was used as a biological model to assess the toxic effects of BPA, PPB, and TCS. The wild type strain, Bristol N2, was used in bioassays with the endpoints of lethality, growth, and reproduction; green fluorescent protein (GFP) transgenic strains with the hsp-3 , hsp-4 , hsp-16...
April 5, 2018: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/29617551/organohalogens-naturally-biosynthesized-in-marine-environments-and-produced-as-disinfection-by-products-alter-sarco-endoplasmic-reticulum-ca-2-dynamics
#13
Jing Zheng, Shaun M K Mckinnie, Abrahim El Gamal, Wei Feng, Yao Dong, Vinayak Agarwal, William Fenical, Abdhesh Kumar, Zhengyu Cao, Bradley S Moore, Isaac N Pessah
Contemporary sources of organohalogens produced as disinfection by-products (DBPs) are receiving considerable attention as emerging pollutants because of their abundance, persistence, and potential to structurally mimic natural organohalogens produced by bacteria that serve signaling and/or toxicological functions in marine environments. Here we tested 34 organohalogens from anthropogenic and marine sources to identify compounds active towards ryanodine receptor (RyR1), known toxicological targets of non-dioxin-like polychlorinated biphenyls (PCBs) and polybrominated diphenylethers (PBDEs)...
April 4, 2018: Environmental Science & Technology
https://www.readbyqxmd.com/read/29606455/analysis-of-40-conventional-and-emerging-disinfection-by-products-in-fresh-cut-produce-wash-water-by-modified-epa-methods
#14
Wan-Ning Lee, Ching-Hua Huang, Guangxuan Zhu
Chlorine sanitizers used in washing fresh and fresh-cut produce can lead to generation of disinfection by-products (DBPs) that are harmful to human health. Monitoring of DBPs is necessary to protect food safety but comprehensive analytical methods have been lacking. This study has optimized three U.S. Environmental Protection Agency methods for drinking water DBPs to improve their performance for produce wash water. The method development encompasses 40 conventional and emerging DBPs. Good recoveries (60-130%) were achieved for most DBPs in deionized water and in lettuce, strawberry and cabbage wash water...
August 1, 2018: Food Chemistry
https://www.readbyqxmd.com/read/29601971/a-novel-stellerite-based-photocatalytic-composite-and-its-enhanced-disinfection-application
#15
Wanzhong Zhang, Haiyu Huang, Zhiming Sun, Shuilin Zheng, Caihong Yu
The aim of this work was to prepare, characterize and evaluate the potential of novel ZnO/stellerite composite photocatalysts against Staphylococcus aureus (S. aureus). SEM/EDS studies employed to study the surface morphological properties revealed stellerite as the catalysts carrier played a role of dispersant for ZnO nanoparticles. The XRD patterns of the ZnO/stellerite indicated hexagonal crystal structure with 20-30 nm size. It was found that the crystallite size of ZnO/stellerite was much smaller as compared to pure ZnO and increased with increasing ZnO loading amount...
March 26, 2018: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/29600845/moderate-bacterial-etching-allows-scalable-and-clean-delamination-of-g-c3n4-with-enriched-unpaired-electrons-for-highly-improved-photocatalytic-water-disinfection
#16
Shifei Kang, Wei Huang, Lu Zhang, Maofen He, Suyun Xu, Di Sun, Xia Jiang
The delamination treatment is crucial in promoting the activity of bulk graphitic carbon nitride (g-C3N4). However, most of the current used methods of exfoliating bulk g-C3N4 to achieve g-C3N4 thin layers suffer from low yield and environmental pollutions. Herein, we developed a facile bacterial etching approach for the preparation of high-quality g-C3N4 nanosheets by exfoliating bulk g-C3N4 under room temperature. Morphology and physicochemical characterizations show the bacteria treated g-C3N4 (BT-CN) samples, especially BT-CN-2d, have a lamina-like 2D in-plane porous structure, significantly enlarged specific surface area (82...
March 30, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29597180/leakage-of-soluble-microbial-products-from-biological-activated-carbon-filtration-in-drinking-water-treatment-plants-and-its-influence-on-health-risks
#17
Shen Hong, Tang Xian-Chun, Wu Nan-Xiang, Chen Hong-Bin
The application of ozone-biological activated carbon (O3 -BAC) as an advanced treatment method in drinking water treatment plants (DWTPs) can help to remove organic micropollutants and further decrease the dissolved organic carbon (DOC) level in finished water. With the increase attention to microbial safety of drinking water, a pre-positioned O3 -BAC followed by a sand filter has been implanted into DWTP located in Shanghai, China to increase the biostability of effluents. The results showed that BAC had high removal efficiencies of UV254 , DOC and disinfection by-product formation potential (DBPFP)...
March 21, 2018: Chemosphere
https://www.readbyqxmd.com/read/29587151/effect-of-preconditioning-on-silver-leaching-and-bromide-removal-properties-of-silver-impregnated-activated-carbon-siac
#18
Babak Rajaeian, Sébastien Allard, Cynthia Joll, Anna Heitz
Silver impregnated activated carbon (SIAC) has been found to be effective in mitigating the formation of brominated-disinfection by products during drinking water treatment. However, there are still uncertainties regarding its silver leaching properties, and strategies for the prevention of silver leaching have remained elusive. This study focused on the evaluation of one type of commercially available SIAC for its ability to remove bromide while minimising silver leaching from the material. Both synthetic and real water matrices were tested...
March 12, 2018: Water Research
https://www.readbyqxmd.com/read/29584701/optimizing-propagation-of-staphylococcus-aureus-infecting-bacteriophage-vb_saum-phiipla-rodi-on-staphylococcus-xylosus-using-response-surface-methodology
#19
Eva González-Menéndez, Francisco Noé Arroyo-López, Beatriz Martínez, Pilar García, Antonio Garrido-Fernández, Ana Rodríguez
The use of bacteriophages for killing pathogenic bacteria is a feasible alternative to antibiotics and disinfectants. To obtain the large quantities of phages required for this application, large-scale production of bacteriophages must be optimized. This study aims to define conditions that maximize the phage yield of the virulent and polyvalent staphylococcal bacteriophage vB_SauM-phiIPLA-RODI in broth culture, using the food-grade species Staphylococcus xylosus as the host strain to reduce the risk of growing massive quantities of pathogenic bacteria and therefore, to ensure the safety of the final phage stock...
March 27, 2018: Viruses
https://www.readbyqxmd.com/read/29582985/core-satellite-supraparticles-to-ballistically-stamp-nanostructures-on-surfaces
#20
Maximilian Oppmann, Franziska Miller, Sandra Thürauf, Philipp Groppe, Johannes Prieschl, Claudia Stauch, Karl Mandel
Nanostructured surfaces are of great importance in a very wide range of fields. They can be obtained by imprint or deposition techniques. However, these are usually sophisticated to perform. Generally, it is not easy to equip an object/product with a nanostructure post manufacturing. Yet, it would be very beneficial to achieve a modification of an arbitrary surface with a nanostructure of choice at a later stage by an approach that is simple to perform without the need of sophisticated equipment or excessive treatment by physico-chemical methods...
March 27, 2018: ACS Applied Materials & Interfaces
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