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https://www.readbyqxmd.com/read/28549371/theoretical-analysis-of-coupled-effects-of-microbe-and-root-architecture-on-methane-oxidation-in-vegetated-landfill-covers
#1
S Feng, A K Leung, C W W Ng, H W Liu
Reduction of soil moisture by plant root-water uptake could improve soil aeration for microbial aerobic methane oxidation (MAMO) in a landfill cover, but excessive soil moisture removal could suppress microbial activity due to water shortage. Existing models ignore the coupled microbe-vegetation interaction. It is thus not known whether the presence of plants is beneficial or adverse to MAMO. This study proposes a newly-improved theoretical model that couples the effects of root-water uptake and microbial activity for capturing water-gas flow and MAMO in unsaturated soils...
May 22, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28549370/assessment-of-the-influence-of-key-abiotic-factors-on-the-alternative-microcystin-degradation-pathway-s-mlr-a-detailed-comparison-with-the-mlr-route-mlr
#2
Jesús Morón-López, Lucía Nieto-Reyes, Rehab El-Shehawy
Cyanobacterial proliferation and toxin production in water bodies around the world have led to global concern about the control of these issues. Indigenous bacteria have been shown to degrade the cyanotoxin microcystin (MC) in natural environments. The mlr cluster has been widely used as a marker for microcystin biodegradation; however, recent studies have shown that alternative pathway(s) also contribute to the natural removal of MCs in the ecosystem. The main objective of this study is to provide initial insights concerning how key abiotic factors affect the rate of MC biodegradation via alternative pathway(s) and to provide a detailed comparison with the mlr(+) pathway...
May 22, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28549326/electrochemical-decolorization-of-methyl-red-by-ruo2-iro2-tio2-electrode-and-biodegradation-with-pseudomonas-stutzeri-mn1-and-acinetobacter-baumannii-mn3-an-integrated-approach
#3
Kuppusamy Sathishkumar, Sivaji Sathiyaraj, Punniyakotti Parthipan, Agrawal Akhil, Kadarkarai Murugan, Aruliah Rajasekar
Textile effluent consists of enormous quantities of toxic dyes, which are being discharged into natural aqueous system and thus contaminate the water quality. Hence it is important to develop an eco-friendly and cost effective technology to treat the dyes contaminated wastewater. In this research, an integrated approach of electrochemical oxidation (EO) and biodegradation process (BP) was studied of methyl red (MR) dye. In EO, RuO2-IrO2-TiO2 is used as anode and titanium mesh electrode as cathode. This was followed by BP of the treated EO effluent...
May 15, 2017: Chemosphere
https://www.readbyqxmd.com/read/28549325/graphene-oxide-in-the-water-environment-could-affect-tetracycline-antibiotic-resistance
#4
Mei-Ting Guo, Guo-Sheng Zhang
In recent years, the influence of new materials like nanoparticles in the water environment on biological substances has been widely studied. Antibiotic resistance genes (ARGs) represent a new type of pollutant in the environment. Graphene oxide (GO), as a nano material, because of its unique structure, may have an impact on antibiotic resistance bacteria (ARB) and ARGs; however the research in this area is rarely reported. Therefore, this study mainly investigated the effects of GO on bacterial antibiotic resistance...
May 3, 2017: Chemosphere
https://www.readbyqxmd.com/read/28549323/investigation-of-submicron-aerosol-characteristics-in-changzhou-china-composition-source-and-comparison-with-co-collected-pm2-5
#5
Zhaolian Ye, Qing Li, Jiashu Liu, Shipeng Luo, Quanfa Zhou, Chenglu Bi, Shuaishuai Ma, Yanfang Chen, Hui Chen, Ling Li, Xinlei Ge
Mass concentrations and chemical compositions of submicron particles (PM1) collected during July 2015 to April 2016 in Changzhou, a city in the Yangtze River Delta region, were systematically investigated for the first time. Specifically, an Aerodyne soot particle aerosol mass spectrometer (SP-AMS) was employed to characterize the water-soluble organic matter (WSOM). The average concentration of PM1 was 63.6 μg m(-3), occupying ∼60% of co-collected PM2.5 mass. Water soluble inorganic ions (WSIIs) was the most abundant component with secondary ions (SO4(2-), NO3(-) and NH4(+)) as the dominant species...
May 17, 2017: Chemosphere
https://www.readbyqxmd.com/read/28549314/application-of-novel-metal-organic-framework-mil-53-fe-and-its-magnetic-hybrid-for-removal-of-pharmaceutical-pollutant-doxycycline-from-aqueous-solutions
#6
Shakiba Naeimi, Hossein Faghihian
As a pharmaceutical pollutant, doxycycline causes contamination when enters into the environment. In this research MIL-53(Fe), and its magnetic hybrid MIL-53(Fe)/Fe3O4 were synthesized and employed for removal of doxycycline from aqueous solutions. The adsorbents were characterized by XRD, SEM, BET, FTIR, EDAX, VSM and TG-DTG technique. The effect of different variables such as DOC concentration, pH, contacting time, and adsorbent dose on the removal efficiency was studied and under optimized conditions the adsorption capacity of 322mgg(-1) was obtained...
May 11, 2017: Environmental Toxicology and Pharmacology
https://www.readbyqxmd.com/read/28549311/reaction-of-diazepam-and-related-benzodiazepines-with-chlorine-kinetics-transformation-products-and-in-silico-toxicological-assessment
#7
Inmaculada Carpinteiro, Rosario Rodil, José Benito Quintana, Rafael Cela
In this work, the reaction of four benzodiazepines (diazepam, oxazepam, nordazepam and temazepam) during water chlorination was studied by means of liquid chromatography-quadrupole-time of flight-mass spectrometry (LC-QTOF-MS). For those compounds that showed a significant degradation, i.e. diazepam, oxazepam and nordazepam, parameters affecting to the reaction kinetics (pH, chlorine and bromide level) were studied in detail and transformation products were tentatively identified. The oxidation reactions followed pseudofirst-order kinetics with rate constants in the range of 1...
May 3, 2017: Water Research
https://www.readbyqxmd.com/read/28549305/adsorption-of-steroid-micropollutants-on-polymer-based-spherical-activated-carbon-pbsac
#8
Matteo Tagliavini, Fabio Engel, Peter Georg Weidler, Torsten Scherer, Andrea Iris Schäfer
Removal and interaction mechanisms of four different steroid micropollutants, estrone (E1), estradiol (E2), progesterone (P) and testosterone (T) were determined for different types of polymer-based spherical activated carbon (PBSAC). Higher than 90% removal and significantly faster kinetics compared to conventional granular activated carbon (GAC) were observed, while performance was comparable with powdered activated carbon (PAC). No influence of pH in the range 2-12 was determined, while the presence of humic acid (HA) reduced both the removal and the kinetic by up to 20%...
April 4, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28549295/structural-characterization-of-astaxanthin-aggregates-as-revealed-by-analysis-and-simulation-of-optical-spectra
#9
Liping Lu, Taoping Hu, Zhigang Xu
Carotenoids can self-assemble in hydrated polar solvents to form J- or H-type aggregates, inducing dramatic changes in photophysical properties. Here, we measured absorption and emission spectra of astaxanthin in ethanol-water solution using ultraviolet-visible and fluorescence spectrometers. Two types of aggregates were distinguished in mixed solution at different water contents by absorption spectra. After addition of water, all probed samples immediately formed H-aggregates with maximum blue shift of 31nm...
May 15, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28549285/environmental-response-to-long-term-mariculture-activities-in-the-weihai-coastal-area-china
#10
Hongmei Li, Xiaomin Li, Qiang Li, Ying Liu, Jide Song, Yongyu Zhang
The environmental impacts of rapid expansion of mariculture have garnered worldwide attention. China is currently one of the largest countries to engage in this practice. In this study, a representative mariculture zone, the Weihai coastal area in China, was explored to determine the temporal variations in regional nutrients, N/P ratio, dissolved oxygen (DO), pH, chlorophyll a (Chl-a), and cellular abundance of diatoms and dinoflagellates in response to the rapid growth in mariculture activities between 2006 and 2014...
May 23, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28549275/understanding-the-relationships-between-water-quality-recreational-fishing-practices-and-human-health-in-phoenix-arizona
#11
E Pulford, B A Polidoro, M Nation
Across the United States, recreational freshwater fisheries are not only an important leisure activity, but can also provide a relatively inexpensive source of protein in local diets. However, recreational freshwater fisheries are generally not well-monitored in terms of fish consumption vs. catch and release, nor are all recreational surface waters regularly monitored for the presence of potentially harmful contaminants in water or fishes. In six urban lakes that support recreational fisheries in Phoenix, Arizona, a majority of surveyed anglers reported eating recreationally caught fishes, even though they thought the water might be polluted...
May 23, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28549240/dietary-salecan-reverts-partially-the-metabolic-gene-expressions-and-nmr-based-metabolomic-profiles-from-high-fat-diet-induced-obese-rats
#12
Qi Sun, Minghui Li, Xiao Yang, Xi Xu, Junsong Wang, Jianfa Zhang
Previous studies suggest that dietary salecan (a water-soluble β-glucan) effectively reduces high-fat-diet-induced adiposity through disturbing bile-acid-promoted emulsification in mice. However, the effects of salecan on metabolic genes and metabolites involved in lipid accumulation are mostly unknown. Here, we confirmed that dietary 3% and 6% salecan for 4 weeks markedly decreased fat accumulation in liver and adipose tissue in high-fat-diet rats, displaying a decrease in mRNA levels of SREBP1-C, FAS, SCD1 and ACC1 involved in de novo lipogenesis and a reduction of levels of GPAT1, DGAT1 and DGAT2 related to triglyceride synthesis...
May 5, 2017: Journal of Nutritional Biochemistry
https://www.readbyqxmd.com/read/28549200/effects-of-cell-death-inducing-dff45-like-effector-b-on-meat-quality-traits-in-berkshire-pigs
#13
G E Yu, S Kwon, J H Hwang, S M An, D H Park, D G Kang, T W Kim, I-S Kim, H C Park, J Ha, C W Kim
Cell death-inducing DFF45-like effector (CIDE) B is a member of the CIDE family of apoptosis-inducing factors. In the present study, we detected a single nucleotide polymorphism (SNP), c.414G>A, which corresponds to the synonymous SNP 414Arg, in CIDE-B in the Berkshire pigs. We also analyzed the relationships between the CIDE-B SNP and various meat quality traits. The SNP was significantly associated with post-mortem pH24h, water-holding capacity (WHC), fat content, protein content, drip loss, post-mortem temperature at 12 h (T12) and 24 h (T24) in a co-dominant model (P < 0...
May 25, 2017: Genetics and Molecular Research: GMR
https://www.readbyqxmd.com/read/28549198/de-novo-transcriptome-assembly-of-sugarcane-leaves-submitted-to-prolonged-water-deficit-stress
#14
A A Belesini, F M S Carvalho, B R Telles, G M de Castro, P F Giachetto, J S Vantini, S D Carlin, J O Cazetta, D G Pinheiro, M I T Ferro
Sugarcane production is strongly influenced by drought, which is a limiting factor for agricultural productivity in the world. In this study, the gene expression profiles obtained by de novo assembly of the leaf transcriptome of two sugarcane cultivars that differ in their physiological response to water deficit were evaluated by the RNA-Seq method: drought-tolerant cultivar (SP81-3250) and drought-sensitive cultivar (RB855453). For this purpose, plants were grown in a greenhouse for 60 days and were then submitted to three treatments: control (-0...
May 25, 2017: Genetics and Molecular Research: GMR
https://www.readbyqxmd.com/read/28549185/visibility-and-persistence-of-marker-dyes-and-effect-on-the-quality-and-mating-competitiveness-of-mass-reared-flies-diptera-tephritidae-anastrepha-obliqua-and-bisexual-and-genetic-sexing-tapachula-7-strains-of-a-ludens
#15
José Arredondo, Lia Ruiz, Gladis López, Francisco Díaz-Fleischer
Fluorescent dyes are commonly used in the sterile insect technique (SIT) for marking insects for a proper identification after recapture. However, the quality of the mark must be balanced against insect performance, because dyes can negatively affect some parameters of insect performance and reduce their effectiveness in control with the SIT. We determined the visibility and persistence and the effect of dyes on the quality of Anastrepha obliqua (Macquart) and Anastrepha ludens (Loew) (bisexual and genetic sexing strains) by testing four concentrations of a dye (Day-Glo) from 0 to 2...
May 26, 2017: Journal of Economic Entomology
https://www.readbyqxmd.com/read/28549168/assessing-the-thermal-dissipation-sap-flux-density-method-for-monitoring-cold-season-water-transport-in-seasonally-snow-covered-forests
#16
Allison M Chan, David R Bowling
Productivity of conifers in seasonally snow-covered forests is high before and during snowmelt when environmental conditions are optimal for photosynthesis. Climate change is altering the timing of spring in many locations, and changes in the date of transition from winter dormancy can have large impacts on annual productivity. Sap flow methods provide a promising approach to monitor tree activity during the cold season and the winter-spring and fall-winter transitions. Although sap flow techniques have been widely used, cold season results are generally not reported...
May 26, 2017: Tree Physiology
https://www.readbyqxmd.com/read/28549151/borrelia-species-detected-in-ticks-feeding-on-wild-korean-water-deer-hydropotes-inermis-using-molecular-and-genotypic-analyses
#17
D VanBik, S H Lee, M G Seo, B R Jeon, Y K Goo, S J Park, M H Rhee, O D Kwon, T H Kim, P J L Geraldino, D Kwak
Lyme borreliosis is a vector-borne disease transmitted through the bite of ticks infected by Borrelia burgdorferi sensu lato group, including B. burgdorferi sensu stricto, B. afzelii, and B. garinii. The goal of the present study was to detect Borrelia species in ticks infesting wild Korean water deer (KWD; Hydropotes inermis Swinhoe), using molecular and genotypic analyses. In total, 48 ticks were collected from KWD, all of which were morphologically identified as Haemaphysalis longicornis Neumann that is dominant in Korea...
May 26, 2017: Journal of Medical Entomology
https://www.readbyqxmd.com/read/28548990/outbreaks-of-nontuberculous-mycobacteria
#18
Geeta Sood, Nikki Parrish
PURPOSE OF REVIEW: The purpose of this review is to summarize the emerging literature on nontuberculous mycobacteria outbreaks in healthcare settings. As our ability to identify mycobacterial species develops, we are better able to recognize epidemiologic connections and better understand the prevalence and importance of these outbreaks and pseudo-outbreaks in healthcare settings. RECENT FINDINGS: The number of outbreaks related to nontuberculous outbreaks is increasing because of heightened awareness and better diagnostic tests for species level identification of mycobacteria...
May 25, 2017: Current Opinion in Infectious Diseases
https://www.readbyqxmd.com/read/28548895/non-canonical-functions-of-claudin-proteins-beyond-the-regulation-of-cell-cell-adhesions
#19
Susan J Hagen
Tight junctions form a barrier to the diffusion of apical and basolateral membrane proteins thus regulating membrane polarity. They also regulate the paracellular movement of ions and water across epithelial and endothelial cells so that functionally they constitute an important permselective barrier. Permselectivity at tight junctions is regulated by claudins, which confer anion or cation permeability, and tightness or leakiness, by forming several highly regulated pores within the apical tight junction complex...
May 19, 2017: Tissue Barriers
https://www.readbyqxmd.com/read/28548864/oral-administration-of-a-medium-containing-both-d-aspartate-producing-live-bacteria-and-d-aspartate-reduces-rectal-temperature-in-chickens
#20
P H Do, P V Tran, M A Bahry, H Yang, G Han, A Tsuchiya, Y Asami, M Furuse, V S Chowdhury
1. The aim of this study was to investigate the effects on the rectal temperature of young chickens of the oral administration of a medium that contained both live bacteria that produce D-aspartate (D-Asp) and D-Asp. 2. In Experiment 1, chickens were subjected to chronic oral administration of either the medium (containing live bacteria and 2.46 μmol D-Asp) or water from 7 to 14 d of age. Plasma-free amino acids as well as mitochondrial biogenic gene expression in the breast muscle were analysed. In Experiment 2, 7-d-old chickens were subjected to acute oral administration of the above medium or of an equimolar amount of D-Asp to examine their effect on changes in rectal temperature...
May 26, 2017: British Poultry Science
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