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https://www.readbyqxmd.com/read/28324616/optimization-of-diazinon-biodegradation-from-aqueous-solutions-by-saccharomyces-cerevisiae-using-response-surface-methodology
#1
Mohammad H Ehrampoush, Abbas Sadeghi, Mohammad T Ghaneian, Ziaeddin Bonyadi
Diazinon is an organophosphate compound that inhibits the activity of acetylcholinesterase. Standards of the World Health Organization and Environmental Protection Agency for diazinon concentration in water are 0.1 and 9 × 10(-6) mg/L, respectively. The aim of this study was the optimization of diazinon biodegradation from aqueous solutions by Saccharomyces cerevisiae using the response surface methodology (RSM). Harvested cells of S. cerevisiae were locally purchased from the Iranian Research Organization for Science and Technology...
December 2017: AMB Express
https://www.readbyqxmd.com/read/28318695/monitoring-water-quality-in-toronto-s-urban-stormwater-ponds-assessing-participation-rates-and-data-quality-of-water-sampling-by-citizen-scientists-in-the-freshwater-watch
#2
Andrew B Scott, Paul C Frost
From 2013 to 2015, citizen scientist volunteers in Toronto, Canada were trained to collect and analyze water quality in urban stormwater ponds. This volunteer sampling was part of the research program, FreshWater Watch (FWW), which aimed to standardize urban water sampling efforts from around the globe. We held training sessions for new volunteers twice yearly and trained a total of 111 volunteers. Over the course of project, ~30% of volunteers participated by collecting water quality data after the training session with 124 individual sampling events at 29 unique locations in Toronto, Canada...
March 16, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28316948/denture-care-practices-and-perceived-denture-status-among-complete-denture-wearers
#3
Krishnam Raju V Kosuru, Ganji Devi, Vikram Grandhi, Kumar K Prasan, Manoj K Yasangi, Mannem Dhanalakshmi
AIMS AND OBJECTIVES: Considerable importance to oral health care was lacking in India, and oral health neglect continues to exist, which is evident in the low utilization rates and poor oral health status. Conventional dentures are the most common alternative in restoration of lost teeth. Without proper denture care practices, there is an increased risk of developing a multitude of problems. The aim of this study is to assess the denture care practices among complete denture wearers in East Godavari district, Andhra Pradesh...
January 2017: Journal of International Society of Preventive & Community Dentistry
https://www.readbyqxmd.com/read/28316054/the-effect-of-fluid-intake-following-dehydration-on-subsequent-athletic-and-cognitive-performance-a-systematic-review-and-meta-analysis
#4
REVIEW
Danielle McCartney, Ben Desbrow, Christopher Irwin
BACKGROUND: The deleterious effects of dehydration on athletic and cognitive performance have been well documented. As such, dehydrated individuals are advised to consume fluid in volumes equivalent to 1.25 to 1.5 L kg(-1) body mass (BM) lost to restore body water content. However, individuals undertaking subsequent activity may have limited time to consume fluid. Within this context, the impact of fluid intake practices is unclear. This systematic review investigated the effect of fluid consumption following a period of dehydration on subsequent athletic and cognitive performance...
December 2017: Sports Medicine—Open
https://www.readbyqxmd.com/read/28315320/controlled-ice-nucleation-using-freeze-dried-pseudomonas-syringae-encapsulated-in-alginate-beads
#5
Lindong Weng, Shannon N Tessier, Anisa Swei, Shannon L Stott, Mehmet Toner
The control of ice nucleation is of fundamental significance in many process technologies related to food and pharmaceutical science and cryobiology. Mechanical perturbation, electromagnetic fields and ice-nucleating agents (INAs) have been known to induce ice nucleation in a controlled manner. But these ice-nucleating methods may suffer from cumbersome manual operations, safety concerns of external fields, and biocompatibility and recovery issues of INA particles, especially when used in living systems. Given the automatic ice-seeding nature of INAs, a promising solution to overcome some of the above limitations is to engineer a biocomposite that accommodates the INA particles but minimizes their interactions with biologics, as well as enabling the recovery of used particles...
March 14, 2017: Cryobiology
https://www.readbyqxmd.com/read/28314146/novel-deep-eutectic-solvent-functionalized-carbon-nanotubes-adsorbent-for-mercury-removal-from-water
#6
Mohamed Khalid AlOmar, Mohammed Abdulhakim Alsaadi, Taha M Jassam, Shatirah Akib, Mohd Ali Hashim
Due to the interestingly tolerated physicochemical properties of deep eutectic solvents (DESs), they are currently in the process of becoming widely used in many fields of science. Herein, we present a novel Hg(2+) adsorbent that is based on carbon nanotubes (CNTs) functionalized by DESs. A DES formed from tetra-n-butyl ammonium bromide (TBAB) and glycerol (Gly) was used as a functionalization agent for CNTs. This novel adsorbent was characterized using Raman spectroscopy, Fourier transform infrared (FTIR) spectroscopy, XRD, FESEM, EDX, BET surface area, and Zeta potential...
March 6, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28296594/vasodilatory-effects-of-combined-traditional-chinese-medicinal-herbs-in-optimized-ratio
#7
Yean Chun Loh, Chu Shan Tan, Yung Sing Ch'ng, Mariam Ahmad, Mohd Zaini Asmawi, Mun Fei Yam
Recently, a new syndromic disease combination theory of traditional Chinese medicine (TCM) for hypertensive treatment has been introduced. In the wake of this new concept, a new science-based TCM formula that counteracts various syndromes is needed. The objective of this study was to develop such a formula. Five of the most clinically prescribed TCM herbs that work on different syndromes, namely Gastrodia elata, Uncaria rhynchophylla, Pueraria thomsonii, Panax notoginseng, and Alisma orientale, were selected for this study...
March 2017: Journal of Medicinal Food
https://www.readbyqxmd.com/read/28296332/monte-carlo-calculations-and-experimental-measurements-of-the-tg-43u1-recommended-dosimetric-parameters-of-125-i-model-ir-seed2-brachytherapy-source
#8
Sahar Sheikholeslami, Hassan Ali Nedaie, Mahdi Sadeghi, Hosein Pourbeigy, Sohrab Shahzadi, Mehdi Zehtabian, Mohsen Hasani, Ali S Meigooni
A new design of I125 (Model IR-Seed2) brachytherapy source has been manufactured recently at the Applied Radiation Research School, Nuclear Science and Technology Research Institute in Iran. The source consists of six resin beads (0.5 mm diameter) that are sealed in a cylindrical titanium capsule of 0.7 mm internal and 0.8 mm external diameters. This work aims to evaluate the dosimetric parameters of the newly designed I125 source using experimental measurements and Monte Carlo (MC) simulations. Dosimetric characteristics (dose rate constant, radial dose function, and 2D and 1D anisotropy functions) of the IR-Seed2 were determined using experimental measurements and MC simulations following the recommendations by the Task Group 43 (TG-43U1) report of the American Association of Physicists in Medicine (AAPM)...
July 2016: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/28282115/formation-of-two-dimensional-micelles-on-graphene-multi-scale-theoretical-and-experimental-study
#9
Benjamin J Robinson, Steven W D Bailey, Luke J O'Driscoll, David Visontai, Daniel J Welsh, Albertus B Mostert, Riccardo Mazzocco, Caroline Rabot, Samuel P Jarvis, Oleg V Kolosov, Martin R Bryce, Colin Lambert
Graphene and related two-dimensional (2D) materials possess outstanding electronic and mechanical properties, chemical stability, and high surface area. However, to realize graphene's potential for a range of applications in materials science and nanotechnology there is a need to understand and control the interaction of graphene with tailored high-performance surfactants designed to facilitate the preparation, manipulation, and functionalization of new graphene systems. Here we report a combined experimental and theoretical study of the surface structure and dynamics on graphene of pyrene-oligoethylene glycol (OEG) -based surfactants, which have previously been shown to disperse carbon nanotubes in water...
March 15, 2017: ACS Nano
https://www.readbyqxmd.com/read/28281140/human-predisposition-to-cognitive-impairment-and-its-relation-with-environmental-exposure-to-potentially-toxic-elements
#10
Marina M S Cabral Pinto, A Paula Marinho-Reis, Agostinho Almeida, Carlos M Ordens, Maria M V G Silva, Sandra Freitas, Mário R Simões, Paula I Moreira, Pedro A Dinis, M Luísa Diniz, Eduardo A Ferreira da Silva, M Teresa Condesso de Melo
New lines of evidence suggest that less than 10% of neurodegenerative diseases have a strict genetic aetiology and other factors may be prevalent. Environmental exposures to potentially toxic elements appear to be a risk factor for Parkinson's, Alzheimer's and sclerosis diseases. This study proposes a multidisciplinary approach combining neurosciences, psychology and environmental sciences while integrating socio-economic, neuropsychological, environmental and health data. We present the preliminary results of a neuropsychological assessment carried out in elderly residents of the industrial city of Estarreja...
March 9, 2017: Environmental Geochemistry and Health
https://www.readbyqxmd.com/read/28276687/infrared-spectra-of-protonated-water-clusters-h-h2o-4-in-eigen-and-zundel-forms-studied-by-vibrational-quasi-degenerate-perturbation-theory
#11
Kiyoshi Yagi, Bo Thomsen
The infrared spectrum of H+(H2O)4 recently observed in a wide spectral range has shown a series of bands in a range of 1700-2500 cm-1, which can not be understood by the standard harmonic normal mode analysis. Here, we theoretically investigate the origin of these bands with a focus on (1) the possibility of co-existence of multiple isomers in the Eigen [H3O+(H2O)3] and Zundel [H5O2+(H2O)2] forms and (2) the effect of anharmonic coupling that gives rise to non-zero intensities for overtones and combination tones...
March 9, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28276489/computational-on-chip-imaging-of-nanoparticles-and-biomolecules-using-ultraviolet-light
#12
Mustafa Ugur Daloglu, Aniruddha Ray, Zoltan Gorocs, Matthew Xiong, Ravinder Malik, Gal Bitan, Euan McLeod, Aydogan Ozcan
Significant progress in characterization of nanoparticles and biomolecules was enabled by the development of advanced imaging equipment with extreme spatial-resolution and sensitivity. To perform some of these analyses outside of well-resourced laboratories, it is necessary to create robust and cost-effective alternatives to existing high-end laboratory-bound imaging and sensing equipment. Towards this aim, we have designed a holographic on-chip microscope operating at an ultraviolet illumination wavelength (UV) of 266 nm...
March 9, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28276247/inducible-sequential-oxidation-process-in-water-soluble-copper-nanoclusters-for-direct-colorimetric-assay-of-hydrogen-peroxide-in-a-wide-dynamic-and-sampling-range
#13
Yibing Du, Jun Fang, Hongli Wang, Yang Yang
Direct and fast detection methods for H2O2 have great demand in materials science, biology, and medicine. Colorimetric assay of H2O2 has been regarded as one versatile approach that can avoid tedious operation and complicated setup. In this report, we provided a cost-effective and time-saving H2O2 colorimetric assay strategy based on a mercaptosuccinic acid (MSA)-stabilized Cu nanocluster (NC) probe without using any chromogenic reagent. Direct and fast colorimetric detection of H2O2 was realized based on the color change of MSA-capped Cu NCs in aqueous medium...
March 15, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28265087/classroom-sound-can-be-used-to-classify-teaching-practices-in-college-science-courses
#14
Melinda T Owens, Shannon B Seidel, Mike Wong, Travis E Bejines, Susanne Lietz, Joseph R Perez, Shangheng Sit, Zahur-Saleh Subedar, Gigi N Acker, Susan F Akana, Brad Balukjian, Hilary P Benton, J R Blair, Segal M Boaz, Katharyn E Boyer, Jason B Bram, Laura W Burrus, Dana T Byrd, Natalia Caporale, Edward J Carpenter, Yee-Hung Mark Chan, Lily Chen, Amy Chovnick, Diana S Chu, Bryan K Clarkson, Sara E Cooper, Catherine Creech, Karen D Crow, José R de la Torre, Wilfred F Denetclaw, Kathleen E Duncan, Amy S Edwards, Karen L Erickson, Megumi Fuse, Joseph J Gorga, Brinda Govindan, L Jeanette Green, Paul Z Hankamp, Holly E Harris, Zheng-Hui He, Stephen Ingalls, Peter D Ingmire, J Rebecca Jacobs, Mark Kamakea, Rhea R Kimpo, Jonathan D Knight, Sara K Krause, Lori E Krueger, Terrye L Light, Lance Lund, Leticia M Márquez-Magaña, Briana K McCarthy, Linda J McPheron, Vanessa C Miller-Sims, Christopher A Moffatt, Pamela C Muick, Paul H Nagami, Gloria L Nusse, Kristine M Okimura, Sally G Pasion, Robert Patterson, Pleuni S Pennings, Blake Riggs, Joseph Romeo, Scott W Roy, Tatiane Russo-Tait, Lisa M Schultheis, Lakshmikanta Sengupta, Rachel Small, Greg S Spicer, Jonathon H Stillman, Andrea Swei, Jennifer M Wade, Steven B Waters, Steven L Weinstein, Julia K Willsie, Diana W Wright, Colin D Harrison, Loretta A Kelley, Gloriana Trujillo, Carmen R Domingo, Jeffrey N Schinske, Kimberly D Tanner
Active-learning pedagogies have been repeatedly demonstrated to produce superior learning gains with large effect sizes compared with lecture-based pedagogies. Shifting large numbers of college science, technology, engineering, and mathematics (STEM) faculty to include any active learning in their teaching may retain and more effectively educate far more students than having a few faculty completely transform their teaching, but the extent to which STEM faculty are changing their teaching methods is unclear...
March 6, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28262715/citizen-science-shows-systematic-changes-in-the-temperature-difference-between-air-and-inland-waters-with-global-warming
#15
Gesa A Weyhenmeyer, Murray Mackay, Jason D Stockwell, Wim Thiery, Hans-Peter Grossart, Pétala B Augusto-Silva, Helen M Baulch, Elvira de Eyto, Josef Hejzlar, Külli Kangur, Georgiy Kirillin, Don C Pierson, James A Rusak, Steven Sadro, R Iestyn Woolway
Citizen science projects have a long history in ecological studies. The research usefulness of such projects is dependent on applying simple and standardized methods. Here, we conducted a citizen science project that involved more than 3500 Swedish high school students to examine the temperature difference between surface water and the overlying air (Tw-Ta) as a proxy for sensible heat flux (QH). If QH is directed upward, corresponding to positive Tw-Ta, it can enhance CO2 and CH4 emissions from inland waters, thereby contributing to increased greenhouse gas concentrations in the atmosphere...
March 6, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28259192/water-in-biomolecular-fluorescence-spectroscopy-and-imaging-side-effects-and-remedies
#16
Alexandre Fürstenberg
Historically, many of the classical organic fluorescent dyes were developed as laser dyes and characterized and optimized in organic solvents. Since then, fluorescence has, however, found a vast range of applications in the life sciences in which the fluorophores are usually surrounded by water and not by organic solvents. The omnipresence of water in biomolecular fluorescence spectroscopy and imaging leads to some unwanted but nonetheless unavoidable consequences on the photophysical properties of the dyes, which may impact the quality and complicate quantitative interpretation of the experiments...
February 22, 2017: Chimia
https://www.readbyqxmd.com/read/28258469/compounding-effects-of-agricultural-land-use-and-water-use-in-free-flowing-rivers-confounding-issues-for-environmental-flows
#17
Scott A Hardie, Chris J Bobbi
Defining the ecological impacts of water extraction from free-flowing river systems in altered landscapes is challenging as multiple stressors (e.g., flow regime alteration, increased sedimentation) may have simultaneous effects and attributing causality is problematic. This multiple-stressor context has been acknowledged in environmental flows science, but is often neglected when it comes to examining flow-ecology relationships, and setting and implementing environmental flows. We examined the impacts of land and water use on rivers in the upper Ringarooma River catchment in Tasmania (south-east Australia), which contains intensively irrigated agriculture, to support implementation of a water management plan...
March 3, 2017: Environmental Management
https://www.readbyqxmd.com/read/28252228/polyoxometalate-polyethylene-glycol-interactions-in-water-from-nano-assemblies-in-water-to-crystal-formation-by-electrostatic-screening
#18
Thomas Buchecker, Xavier Le Goff, Bappaditya Naskar, Arno Pfitzner, Olivier Diat, Pierre Bauduin
In the last decade organic-inorganic hybrid materials have become essential in material science as they combine properties of both building blocks. Nowadays the main routes for their synthesis involve electrostatic coupling, covalent grafting and/or solvent effects. In this field, polyoxometalates (POMs) have emerged as interesting inorganic functional building blocks due to their outstanding prop-erties. In the present work we show that the well-known α-Keggin polyoxometalate, α-PW12O403- (PW), can form hybrid crystalline materials with industrial (neutral) poly-ethylene glycol oligomers (PEG) under mild conditions, i...
March 2, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28252155/double-rare-earth-nanothermometer-in-aqueous-media-opening-the-third-optical-transparency-window-to-temperature-sensing
#19
A Skripka, A Benayas, R Marin, P Canton, E Hemmer, F Vetrone
Owing to the alluring possibility of contactless temperature probing with microscopic spatial resolution, photoluminescence nanothermometry at the nanoscale is rapidly advancing towards its successful application in biomedical sciences. The emergence of near-infrared nanothermometers has paved the way for temperature sensing at the deep tissue level. However, water dispersibility, adequate size at the nanoscale, and the capability to efficiently operate in the second and third biological optical transparency windows are the requirements that still have to be fulfilled in a single nanoprobe...
March 2, 2017: Nanoscale
https://www.readbyqxmd.com/read/28249740/bridging-science-and-traditional-knowledge-to-assess-cumulative-impacts-of-stressors-on-ecosystem-health
#20
Chrystal S Mantyka-Pringle, Timothy D Jardine, Lori Bradford, Lalita Bharadwaj, Andrew P Kythreotis, Jennifer Fresque-Baxter, Erin Kelly, Gila Somers, Lorne E Doig, Paul D Jones, Karl-Erich Lindenschmidt
Cumulative environmental impacts driven by anthropogenic stressors lead to disproportionate effects on indigenous communities that are reliant on land and water resources. Understanding and counteracting these effects requires knowledge from multiple sources. Yet the combined use of Traditional Knowledge (TK) and Scientific Knowledge (SK) has both technical and philosophical hurdles to overcome, and suffers from inherently imbalanced power dynamics that can disfavour the very communities it intends to benefit...
February 26, 2017: Environment International
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