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https://www.readbyqxmd.com/read/28735091/effect-of-extracellular-polymeric-substance-components-on-the-sorption-behavior-of-2-2-4-4-tetrabromodiphenyl-ether-to-soils-kinetics-and-isotherms
#1
Guangxia Liu, Yongrong Bian, Mingyun Jia, Lisa A Boughner, Chenggang Gu, Yang Song, Hongjie Sheng, Wei Zhao, Xin Jiang, Fang Wang
Microbial extracellular polymeric substances (EPS) and persistent organic pollutants (POPs) commonly exist in the soil environment. Currently, there is a knowledge gap regarding the effect of EPS on the fate of POPs in soil. In the present study, 2,2',4,4'-tetrabromodiphenyl ether (BDE-47) was used as a model compound to investigate the effects of bovine serum albumin (BSA) and sodium alginate (SA) - mimicking the main components of EPS - on sorption of POPs to soils, through batch experiments. Irrespective of the concentration of BSA: the addition of BSA did enhance the sorption capacity of BDE-47 to soils, due to generation of more sorption sites...
July 20, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28734216/releasing-of-hexabromocyclododecanes-from-expanded-polystyrenes-in-seawater-field-and-laboratory-experiments
#2
Manviri Rani, Won Joon Shim, Mi Jang, Gi Myung Han, Sang Hee Hong
Expanded polystyrene (EPS) is a major component of marine debris globally. Recently, hazardous hexabromocyclododecanes (HBCDDs) were detected in EPS buoys used for aquaculture farming. Subsequently, enrichment of HBCDDs was found in nearby marine sediments and mussels growing on EPS buoys. It was suspected that EPS buoys and their debris might be sources of HBCDDs. To confirm this, the release of HBCDDs from EPS spherules detached from a buoy to seawater was investigated under field (open sea surface and closed outdoor chambers with sun exposure and in the dark) and laboratory (particle-size) conditions...
July 11, 2017: Chemosphere
https://www.readbyqxmd.com/read/28733286/the-regulator-ldhr-and-the-d-lactate-dehydrogenase-ldha-of-burkholderia-multivorans-play-a-role-in-carbon-overflow-and-in-planktonic-cellular-aggregates-formation
#3
Inês N Silva, Marcelo J Ramires, Lisa A Azevedo, Ana R Guerreiro, Andreia C Tavares, Jörg D Becker, Leonilde M Moreira
LysR-type transcriptional regulators (LTTR) are the most commonly found regulators in Burkholderia cepacia complex, comprising opportunistic pathogens causing chronic respiratory infections in cystic fibrosis (CF) patients. Despite LTTRs being global regulators of pathogenicity in several bacteria, few have been characterized in Burkholderia Here, we showed that gene ldhR of B. multivorans encoding a LTTR is co-transcribed with ldhA encoding a d-lactate dehydrogenase, and evaluate their implication in virulence traits like exopolysaccharide (EPS) synthesis and biofilm formation...
July 21, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/28732010/biofilm-imaging-in-porous-media-by-laboratory-x-ray-tomography-combining-a-non-destructive-contrast-agent-with-propagation-based-phase-contrast-imaging-tools
#4
Maxence Carrel, Mario A Beltran, Verónica L Morales, Nicolas Derlon, Eberhard Morgenroth, Rolf Kaufmann, Markus Holzner
X-ray tomography is a powerful tool giving access to the morphology of biofilms, in 3D porous media, at the mesoscale. Due to the high water content of biofilms, the attenuation coefficient of biofilms and water are very close, hindering the distinction between biofilms and water without the use of contrast agents. Until now, the use of contrast agents such as barium sulfate, silver-coated micro-particles or 1-chloronaphtalene added to the liquid phase allowed imaging the biofilm 3D morphology. However, these contrast agents are not passive and potentially interact with the biofilm when injected into the sample...
2017: PloS One
https://www.readbyqxmd.com/read/28731299/human-biomonitoring-of-lead-exposure
#5
Katrin Klotz, Thomas Göen
After a chronic exposure, lead accumulates in the human body, especially in bones and teeth. Critical effects of lead affect the nervous system, reproduction, fertility as well as genotoxicity and carcinogenicity [1]. Analyses of lead concentrations in human biological material are performed using inductively coupled plasma mass spectrometry and atomic absorption spectrometry, but also electrochemical methods and X-ray fluorescence spectroscopy. The predominant sample matrices include blood and bone, as well as urine, hair, nail, and saliva...
April 10, 2017: Metal Ions in Life Sciences
https://www.readbyqxmd.com/read/28730360/characterization-of-extracellular-polymeric-substance-eps-fractions-produced-by-microcystis-aeruginosa-under-the-stress-of-linoleic-acid-sustained-release-microspheres
#6
Lixiao Ni, Danye Li, Shiyi Rong, Lili Su, Wei Zhou, Peifang Wang, Chao Wang, Shiyin Li, Kumud Acharya
This paper focuses on the characterization of extracellular polymeric substances (EPS), which are composed of soluble EPS (SL-EPS), loosely bound EPS (LB-EPS), and tightly bound EPS (TB-EPS) produced by Microcystis aeruginosa under the stress of linoleic acid (LA) and LA sustained-release microspheres. Three-dimensional excitation-emission matrix (3D-EEM) fluorescence spectroscopy and Fourier transform infrared (FTIR) spectrometry were used to characterize three forms of EPS while the content of polysaccharide and protein was tested, respectively...
July 20, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28724411/a-qualitative-study-exploring-perceptions-and-attitudes-of-community-pharmacists-about-extended-pharmacy-services-in-lahore-pakistan
#7
Furqan K Hashmi, Mohamed Azmi Hassali, Adnan Khalid, Fahad Saleem, Hisham Aljadhey, Zaheer Ud Din Babar, Mohammad Bashaar
BACKGROUND: In recent decades, community pharmacies reported a change of business model, whereby a shift from traditional services to the provision of extended roles was observed. However, such delivery of extended pharmacy services (EPS) is reported from the developed world, and there is scarcity of information from the developing nations. Within this context, the present study was aimed to explore knowledge, perception and attitude of community pharmacists (CPs) about EPS and their readiness and acceptance for practice change in the city of Lahore, Pakistan...
July 19, 2017: BMC Health Services Research
https://www.readbyqxmd.com/read/28722535/persistence-of-mercury-induced-motor-and-sensory-neurotoxicity-systematic-review-of-workers-previously-exposed-to-mercury-vapor
#8
Cheryl A Fields, Jonathan Borak, Elan D Louis
Elemental mercury (Hg(0)) is a well-recognized neurotoxicant, but it is uncertain whether and for how long its neurotoxicity persists. Among studies that evaluated previously-exposed workers, only one examined workers during and also years after exposure had ceased. The objective of this review is to create a series of 'synthetic' longitudinal studies to address the question of persistence of Hg(0) neurotoxicity in occupationally exposed workers. We systematically reviewed studies describing objective motor and sensory effects in previously-exposed mercury workers...
July 19, 2017: Critical Reviews in Toxicology
https://www.readbyqxmd.com/read/28721855/cell-surface-physiology-and-outer-cell-envelope-impermeability-for-hydrophobic-substances-in-burkholderia-multivorans
#9
Sallie A Ruskoski, Franklin R Champlin
PURPOSE: The purpose of the present study was to obtain a better understanding of the relationship between cell surface physiology and outer cellular envelope permeability for hydrophobic substances in mucoid and non-mucoid B. multivorans strains, as well as in two capsule-deficient derivatives of a mucoid parental strain. METHODOLOGY: Cell surface hydrophobicity properties were determined using the hydrocarbon adherence method, while outer cell envelope accessibility and permeability for non-polar compounds were measured using hydrophobic antimicrobial agent susceptibility and fluorescent probe assays...
July 18, 2017: Journal of Medical Microbiology
https://www.readbyqxmd.com/read/28716593/the-critical-care-literature-2016
#10
REVIEW
Michael E Winters, Joseph P Martinez, Haney Mallemat, William J Brady
An emergency physician (EP) is often the first health care provider to evaluate, resuscitate, and manage a critically ill patient. Between 2001 and 2009, the annual hours of critical care delivered in emergency departments (EDs) across the United States increased >200%! (Herring et al., 2013). This trend has persisted since then. In addition to seeing more critically ill patients, EPs are often tasked with providing critical care long beyond the initial resuscitation period. In fact, >33% of critically ill patients who are brought to an ED remain there for >6h (Herring et al...
July 13, 2017: American Journal of Emergency Medicine
https://www.readbyqxmd.com/read/28716448/textile-aging-characterization-on-new-generations-of-explanted-commercial-endoprostheses-a-preliminary-study
#11
A Bussmann, F Heim, C Delay, E Girsowicz, B Del Tatto, D Dion, J Papillon, A Lejay, J Chakfé, F Thaveau, Y Georg, N Chakfé
OBJECTIVE/BACKGROUND: The goal of the present study was to assess the aging phenomena on second-generation textile endoprostheses (EPs) through explant analysis and to establish a preliminary classification of observed defects and material damages. METHODS: From January 2011 to June 2016 110 second- and recent-generation EPs were collected as a part of a European collaborative retrieval program. The analysis focused on the first 41 consecutive commercial EPs collected between 2011 and 2014 and made from polyethylene terephthalate...
July 14, 2017: European Journal of Vascular and Endovascular Surgery
https://www.readbyqxmd.com/read/28716362/phosphoenolpyruvate-phosphotransferase-system-components-positively-regulate-klebsiella-biofilm-formation
#12
Yu-Tze Horng, Chi-Jen Wang, Wen-Ting Chung, Huei-Jen Chao, Yih-Yuan Chen, Po-Chi Soo
BACKGROUND/PURPOSE: Klebsiella pneumoniae is one of the leading causes of device-related infections (DRIs), which are associated with attachment of bacteria to these devices to form a biofilm. The latter is composed of not only bacteria but also extracellular polymeric substances (EPSes) consisting of extracellular DNAs, polysaccharides, and other macromolecules. The phosphoenolpyruvate (PEP):carbohydrate phosphotransferase system (PTS) regulates diverse processes of bacterial physiology...
June 29, 2017: Journal of Microbiology, Immunology, and Infection, Wei Mian Yu Gan Ran za Zhi
https://www.readbyqxmd.com/read/28715508/biofilm-extracellular-polysaccharides-degradation-during-starvation-and-enamel-demineralization
#13
Bárbara Emanoele Costa Oliveira, Jaime Aparecido Cury, Antônio Pedro Ricomini Filho
This study was conducted to evaluate if extracellular polysaccharides (EPS) are used by Streptococcus mutans (Sm) biofilm during night starvation, contributing to enamel demineralization increasing occurred during daily sugar exposure. Sm biofilms were formed during 5 days on bovine enamel slabs of known surface hardness (SH). The biofilms were exposed to sucrose 10% or glucose + fructose 10.5% (carbohydrates that differ on EPS formation), 8x/day but were maintained in starvation during the night. Biofilm samples were harvested during two moments, on the end of the 4th day and in the morning of the 5th day, conditions of sugar abundance and starvation, respectively...
2017: PloS One
https://www.readbyqxmd.com/read/28711803/investigation-on-the-response-of-anaerobic-membrane-bioreactor-to-temperature-decrease-from-25%C3%A2-c-to-10%C3%A2-c-in-sewage-treatment
#14
Ryoya Watanabe, Yulun Nie, Shinichiro Wakahara, Daisuke Komori, Yu-You Li
Anaerobic membrane bioreactor (AnMBR) for sewage treatment was operated for 650days with the decrease of temperature from 25°C to 10°C. At higher temperature >15°C, COD removal was above 94% while sewage treatment efficiency and relevant CH4 production decreased below 15°C. The effluent COD at 10°C was 134mg/L at HRT of 16h. Moreover, low temperature can result in a higher membrane fouling rate due to the microbial self-protection behavior in coping with the temperature decrease by releasing soluble microbial products (SMP) and extracellular polymeric substances (EPS)...
July 4, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28711270/evaluation-of-the-yield-molar-mass-of-exopolysaccharides-and-rheological-properties-of-gels-formed-during-fermentation-of-milk-by-streptococcus-thermophilus-strains-st-143-and-st-10255y
#15
Som N Khanal, John A Lucey
The yield and chemical structures of exopolysaccharides (EPS) produced by many strains of Streptococcus thermophilus have been characterized. However, the kinetics (or production profile) for EPS during milk fermentation is not clear. In this study, we investigated whether any differences existed in the yield and molar mass of EPS when milk was fermented at the same acidification rate by 2 strains of S. thermophilus (St-143 and ST-10255y). The type of EPS produced by these 2 strains is different. Milk samples were analyzed for EPS concentration every 30 min during a fermentation period of 270 min (final pH 4...
July 12, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28711240/characterization-and-bioactivities-of-the-exopolysaccharide-from-a-probiotic-strain-of-lactobacillus-plantarum-wlpl04
#16
Zhengqi Liu, Zhihong Zhang, Liang Qiu, Fen Zhang, Xiongpeng Xu, Hua Wei, Xueying Tao
Exopolysaccharide (EPS) was extracted and purified from Lactobacillus plantarum WLPL04, which has been confirmed previously as a potential probiotic for its antagonistic and immune-modulating activity. It has a molecular weight of 6.61 × 10(4) Da, consisting of xylose, glucose, and galactose in an approximate molar ratio of 3.4: 1.8: 1. Microstructural studies demonstrated that the EPS appeared as a smooth sheet structure with many homogeneous rod-shaped lumps. The preliminary in vitro assays indicated that the EPS could significantly inhibit the adhesion of Escherichia coli O157:H7 to HT-29 cells in competition, replacement, and inhibition assays at a dose of 1...
July 12, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28710231/tuberin-regulates-prostaglandin-receptor-mediated-viability-via-rheb-in-mtorc1-hyperactive-cells
#17
Chenggang Li, Xiaolei Liu, Yang Liu, Erik Zhang, Kantha Medepalli, Kohei Masuda, Na Li, Elizabeth J Kopras, David J Kwiatkowski, Michael T Borchers, Kathryn A Wikenheiser-Brokamp, Andrew Osterburg, Maxwell Mays, Yang Sun, David R Plas, Julia L Sun, David N Franz, Jamie K Capal, Anya Alayev, Marina K Holz, Darcy A Krueger, Brian J Siroky, Jane J Yu
Tuberous sclerosis complex (TSC) is a tumor suppressor syndrome affecting multiple organs, including the brain, skin, kidneys, heart, and lungs. TSC is associated with mutations in TSC1 or TSC2 resulting in hyperactivation of mechanistic target of rapamycin complex 1 (mTORC1). Clinical trials demonstrate that mTORC1 inhibitors decrease tumor volume and stabilize lung function in TSC patients; however, mTOR inhibitors are cytostatic not cytocidal, and long-term benefits and toxicities are uncertain. Previously, we identified rapamycin-insensitive upregulation of cyclooxygenase 2 (PTGS2/COX2) and prostaglandin E2 (PGE2) production in TSC2-deficient cells and postulate that the action of excess PGE2 and its cognate receptors (EPs) contribute to cell survival...
July 14, 2017: Molecular Cancer Research: MCR
https://www.readbyqxmd.com/read/28710011/antibacterial-activity-of-food-grade-chitosan-against-vibrio-parahaemolyticus-biofilms
#18
Ting Xie, Zhenlin Liao, Huan Lei, Xiang Fang, Jie Wang, Qingping Zhong
Biofilm is a community composed of microbes and the extracellular polymeric substances. This special architecture poses a significant public health risk as it increases the fitness of bacteria in harsh conditions and renders bacterial resistance to antimicrobial agents and cleaning. In this study, we investigated the inhibition and eradication effects of chitosan on the biofilm of Vibrio parahaemolyticus, an important food-borne pathogen. The crystal violet staining, [2, 3-bis (2-methoxy-4-nitro-5- sulfophenyl)-2H-tetrazolium-5-carboxanilide] (XTT) reduction method, phenol-sulfuric acid method, fluorescence microscope and confocal laser scanning microscope (CLSM) observation were conducted...
July 11, 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/28709069/characterization-of-changes-in-floc-morphology-extracellular-polymeric-substances-and-heavy-metals-speciation-of-anaerobically-digested-biosolid-under-treatment-with-a-novel-chelated-fe-2-catalyzed-fenton-process
#19
Juanjuan He, Peng Yang, Weijun Zhang, Bingdi Cao, Hua Xia, Xi Luo, Dongsheng Wang
A novel chelated-Fe(2+) catalyzed Fenton process (CCFP) was developed to enhance dewatering performance of anaerobically digested biosolid, and changes in floc morphology, extracellular polymeric substances (EPS) and heavy metals speciation were also investigated. The results showed that addition of chelating agents caused EPS solubilization by binding multivalent cations. Like traditional Fenton, CCFP performed well in improving anaerobically digested sludge dewatering property. The highly active radicals (OH, O2(-)) produced in classical Fenton and CCFP were responsible for sludge flocs destruction and consequently degradation of biopolymers into small molecules...
July 3, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28708433/physical-health-outcomes-in-preschoolers-with-prior-authorization-for-antipsychotics
#20
Yu-Jung Wei, Xinyue Liu, Nikhil Rao, Marie McPherson, Mary Beth Jones, Regina Bussing, Almut G Winterstein
OBJECTIVE: To examine incidence of adverse health outcomes and associated factors among preschoolers (under age 6) who received antipsychotic treatment through the Florida Medicaid Prior Authorization (PA) program. METHODS: Using Florida's PA registry linked to the state's Medicaid claims data, we ascertained incident outcomes during PA-approved antipsychotic use between April 2008 and September 2015 (7.5 years). Six outcomes associated with use of antipsychotics included: diabetes, obesity, hyperlipidemia, hyperprolactinemia, cardiovascular disease (CVD) (including hypertension, ventricular arrhythmia, and other CVDs), and extrapyramidal symptoms (EPS) (including dystonia, akathisia, parkinsonism, and tardive dyskinesia)...
July 14, 2017: Journal of Child and Adolescent Psychopharmacology
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