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https://www.readbyqxmd.com/read/28433937/perturbation-effect-of-reduced-graphene-oxide-quantum-dots-rgoqds-on-aryl-hydrocarbon-receptor-ahr-pathway-in-zebrafish
#1
Jing-Hui Zhang, Tai Sun, Aping Niu, Yu-Mei Tang, Shun Deng, Wei Luo, Qun Xu, Dapeng Wei, De-Sheng Pei
Graphene quantum dots (GQDs) has been widely used in enormous fields, however, the inherent molecular mechanism of GQDs for potential risks in biological system is still elusive to date. In this study, the outstanding reduced graphene quantum dots (rGOQDs) with the QY as high as 24.62% were successfully synthesized by the improved Hummers method and DMF hydrothermal treatment approach. The rGOQDs were N-doped photoluminescent nanomaterials with functional groups on the surface. The fluorescent bio-imaging was performed by exposing zebrafish in different concentrations of the as-prepared rGOQDs, and the distribution of rGOQDs was successfully observed...
April 15, 2017: Biomaterials
https://www.readbyqxmd.com/read/28429050/assessment-of-cr-ni-and-pb-pollution-in-rural-agricultural-soils-of-tonalite-trondjhemite-series-in-central-india
#2
Kriti Shukla, Bijendra Kumar, Rahul Agrawal, Kumari Priyanka, Madavi Venkatesh, Anshumali
Chromium (Cr), nickel (Ni) and lead (Pb) contamination was investigated in wheat cultivated rain-fed and irrigated rural agricultural soils (n = 31) of Tonalite-Trondjhemite Series in Central India. The soil sampling was carried out by using stratified random sampling method. The mean concentrations of Cr, Ni and Pb were 54.8, 38.1 and 68.9 mg/kg, respectively. The average values of enrichment factor (EF), geoaccumulation index (I geo ) and contamination factor (CF) followed the order as: Pb > Ni > Cr...
April 20, 2017: Bulletin of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/28426988/solar-photocatalytic-application-of-nbo2oh-as-alternative-photocatalyst-for-water-treatment
#3
Luana Márcia Bezerra Batista, Alexsandro Jhones Dos Santos, Djalma Ribeiro da Silva, Ana Paula de Melo Alves, Sergi Garcia-Segura, Carlos Alberto Martínez-Huitle
Water recycling and industrial effluents remediation are a hot topic of research to reduce the environmental impact of the human activity. Persistent organic pollutants are highly recalcitrant compounds with hazardous effects associated to their fate in water bodies. Several novel technologies have been developed during the last decades to deal with this novel contamination. However, the natural sources and idiosyncrasy of each country lead to the potential application of different technologies. In this context, we have focused on the development of phocotalytic treatment of solutions containing dyes using a novel photocatalytic material, the NbO2OH...
April 17, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28426294/the-interface-among-poverty-air-mattress-industry-trends-policy-and-infant-safety
#4
Jennifer J Doering, Trina C Salm Ward
Infants can suffocate on air mattresses, even when the mattress is fully inflated. The interfacing issues of poverty, the bedbug epidemic, and changes in the design and marketing of air mattresses may be increasing consumer use of air mattresses as primary sleep environments and thus increasing the potential for infant death. Despite recent changes to improve air mattress safety labeling, the National Child Death Review Case Reporting System found that between 2004 and 2015 across 24 states, an air mattress was the incident sleep place for 108 infants whose deaths were either during sleep or in a sleep environment...
April 20, 2017: American Journal of Public Health
https://www.readbyqxmd.com/read/28425999/three-dimensional-printing-of-transparent-fused-silica-glass
#5
Frederik Kotz, Karl Arnold, Werner Bauer, Dieter Schild, Nico Keller, Kai Sachsenheimer, Tobias M Nargang, Christiane Richter, Dorothea Helmer, Bastian E Rapp
Glass is one of the most important high-performance materials used for scientific research, in industry and in society, mainly owing to its unmatched optical transparency, outstanding mechanical, chemical and thermal resistance as well as its thermal and electrical insulating properties. However, glasses and especially high-purity glasses such as fused silica glass are notoriously difficult to shape, requiring high-temperature melting and casting processes for macroscopic objects or hazardous chemicals for microscopic features...
April 19, 2017: Nature
https://www.readbyqxmd.com/read/28422598/the-use-of-restorative-materials-in-primary-molars-among-pediatric-dentists-in-israel
#6
Sigalit Blumer, Benjamin Peretz, Tal Ratson
OBJECTIVES: To assess the current choice of various restoration materials among Israeli pediatric dentists according to seniority and specialty. STUDY DESIGN: Participating dentists completed a 23-item questionnaire on their qualifications, type of practice and preference of restorative material. RESULTS: Seventy-five dentists (average age 46.27±12.6 years, 58 females) participated. Forty-one were specialist pediatric dentists and 34 were general practitioners...
2017: Journal of Clinical Pediatric Dentistry
https://www.readbyqxmd.com/read/28414610/clinical-calculator-for-early-mortality-in-metastatic-colorectal-cancer-an-analysis-of-patients-from-28-clinical-trials-in-the-aide-et-recherche-en-canc%C3%A3-rologie-digestive-database
#7
Lindsay A Renfro, Richard M Goldberg, Axel Grothey, Alberto Sobrero, Richard Adams, Matthew T Seymour, Volker Heinemann, Hans-Joachim Schmoll, Jean-Yves Douillard, Herbert Hurwitz, Charles S Fuchs, Eduardo Diaz-Rubio, Rainer Porschen, Christophe Tournigand, Benoist Chibaudel, Paulo M Hoff, Fairooz F Kabbinavar, Alfredo Falcone, Niall C Tebbutt, Cornelis J A Punt, J Randolph Hecht, John Souglakos, Carsten Bokemeyer, Eric Van Cutsem, Leonard Saltz, Aimery de Gramont, Daniel J Sargent
Purpose Factors contributing to early mortality after initiation of treatment of metastatic colorectal cancer are poorly understood. Materials and Methods Data from 22,654 patients enrolled in 28 randomized phase III trials contained in the ARCAD (Aide et Recherche en Cancérologie Digestive) database were pooled. Multivariable logistic regression models for 30-, 60-, and 90-day mortality were constructed, including clinically and statistically significant patient and disease factors and interaction terms. A calculator (nomogram) for 90-day mortality was developed and validated internally using bootstrapping methods and externally using a 10% random holdout sample from each trial...
April 17, 2017: Journal of Clinical Oncology: Official Journal of the American Society of Clinical Oncology
https://www.readbyqxmd.com/read/28413336/a-restatement-of-the-natural-science-evidence-concerning-catchment-based-natural-flood-management-in-the-uk
#8
REVIEW
Simon J Dadson, Jim W Hall, Anna Murgatroyd, Mike Acreman, Paul Bates, Keith Beven, Louise Heathwaite, Joseph Holden, Ian P Holman, Stuart N Lane, Enda O'Connell, Edmund Penning-Rowsell, Nick Reynard, David Sear, Colin Thorne, Rob Wilby
Flooding is a very costly natural hazard in the UK and is expected to increase further under future climate change scenarios. Flood defences are commonly deployed to protect communities and property from flooding, but in recent years flood management policy has looked towards solutions that seek to mitigate flood risk at flood-prone sites through targeted interventions throughout the catchment, sometimes using techniques which involve working with natural processes. This paper describes a project to provide a succinct summary of the natural science evidence base concerning the effectiveness of catchment-based 'natural' flood management in the UK...
March 2017: Proceedings. Mathematical, Physical, and Engineering Sciences
https://www.readbyqxmd.com/read/28412902/nanosafety-towards-safer-nanoparticles-by-design
#9
Neus G Bastús, Víctor Puntes
The continuous development of Nanotechnology is progressively introducing nanoparticles into society. However, little is known about the safety of nanoparticles and functions of engineered nanomaterials, in particular how the physicochemical properties of the materials relate to mechanisms of injury at the nano-bio interface. While comprehensive knowledge on the potential toxicity of NPs is still lacking, as time goes by and research in the field continues, different aspects, such as interactions with the immune system, perturbation of cellular membranes, transportation of toxic moieties and others are emerging as potentially hazardous aspects of NPs...
April 13, 2017: Current Medicinal Chemistry
https://www.readbyqxmd.com/read/28411192/socioeconomic-status-interacts-with-the-genetic-effect-of-a-chromosome-9p21-3-common-variant-to-influence-coronary-artery-calcification-and-incident-coronary-events-in-the-heinz-nixdorf-recall-study-risk-factors-evaluation-of-coronary-calcium-and-lifestyle
#10
Börge Schmidt, Stefanie Frölich, Nico Dragano, Mirjam Frank, Lewin Eisele, Sonali Pechlivanis, Andreas J Forstner, Markus M Nöthen, Amir A Mahabadi, Raimund Erbel, Susanne Moebus, Karl-Heinz Jöckel
BACKGROUND: Genetic variants of a locus within the chromosome 9p21.3 region are consistently associated with coronary artery disease and coronary artery calcification (CAC). The aim of this study was to examine whether a 9p21.3 common variant interacts with socioeconomic status (SES) to influence CAC and incident coronary events in a population-based cohort. METHODS AND RESULTS: 9p21.3 single nucleotide polymorphism rs2891168 was genotyped in 4116 participants of the Heinz Nixdorf Recall study...
April 2017: Circulation. Cardiovascular Genetics
https://www.readbyqxmd.com/read/28410541/the-influence-of-a-novel-two-dimensional-graphene-like-nanomaterial-on-thermal-stability-and-flammability-of-polystyrene
#11
Keqing Zhou, Rui Gao
Significant improvements in thermal stability and fire resistance properties of polymer materials with nanofillers at low loadings hold tremendous promise for fire safety materials. In this study, a novel two dimensional (2D) graphene-like nanomaterial (VOP) was synthesized by a simple refluxing method and then modified with typical organic surfactants. Subsequently, the novel graphene-like nanomaterials were incorporated into polystyrene (PS) matrix for reducing fire hazards. The SEM and TEM images indicated that the VOP nanosheets were well dispersed throughout the matrix without obvious aggregates, leading to remarkable improvements of thermal stability and fire safety properties...
April 7, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28409822/non-hazardous-biocatalytic-oxidation-in-nylon-9-monomer-synthesis-on-a-40-gram-scale-with-efficient-downstream-processing
#12
Sofia Milker, Michael J Fink, Florian Rudroff, Marko D Mihovilovic
This paper describes the development of a biocatalytic process on the multi-dozen gram scale for the synthesis of a precursor to Nylon-9, a specialty polyamide. Such materials are growing in demand, but their corresponding monomers are often difficult to synthesize, giving rise to biocatalytic approaches. Here, we implemented cyclopentadecanone monooxygenase as an Escherichia coli whole-cell biocatalyst in a defined medium, together with a substrate feeding-product removal concept, and an optimized downstream processing (DSP)...
April 14, 2017: Biotechnology and Bioengineering
https://www.readbyqxmd.com/read/28408065/cheaper-faster-or-better-are-simple-estimations-of-safety-parameters-of-hazardous-materials-reliable-comments-on-thermal-behaviors-nonisothermal-decomposition-reaction-kinetics-thermal-safety-and-burning-rates-of-btatz-cmdb-propellant-by-zhao-et-al-2010
#13
https://www.readbyqxmd.com/read/28407598/eggshell-waste-as-catalyst-a-review
#14
REVIEW
Amanda Laca, Adriana Laca, Mario Díaz
Agricultural wastes are some of the most emerging problems in food industries because of their disposal cost. However, it is also an opportunity for the bioeconomy society if new uses for these residual materials can be found. Eggshells, considered a hazardous waste by UE regulations, are discarded, amounting hundreds of thousands of tonnes worldwide. This egg processing waste is a valuable source material, which can be used in different fields such as fodder or fertilizer production. Additionally, this residue offers interesting characteristics to be used in other applications, like its employment as an environment-friendly catalyst...
April 10, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28404135/incidence-risk-factors-and-prevention-of-hepatitis-c-reinfection-a-population-based-cohort-study
#15
Nazrul Islam, Mel Krajden, Jean Shoveller, Paul Gustafson, Mark Gilbert, Jane A Buxton, Jason Wong, Mark W Tyndall, Naveed Zafar Janjua
BACKGROUND: People remain at risk of reinfection with hepatitis C virus (HCV), even after clearance of the primary infection. We identified factors associated with HCV reinfection risk in a large population-based cohort study in British Columbia, Canada, and examined the association of opioid substitution therapy and mental health counselling with reinfection. METHODS: We obtained data from the British Columbia Hepatitis Testers Cohort, which includes all individuals tested for HCV or HIV at the British Columbia Centre for Disease Control Public Health Laboratory during 1990-2013 (when data were available)...
March 2017: Lancet. Gastroenterology & Hepatology
https://www.readbyqxmd.com/read/28402098/novel-multilayer-nanostructured-materials-for-recognition-of-polycyclic-aromatic-sulfur-pollutants-and-express-analysis-of-fuel-quality-and-environmental-health-by-surface-enhanced-raman-spectroscopy
#16
Olga E Eremina, Alexander V Sidorov, Tatyana N Shekhovtsova, Eugene A Goodilin, Irina A Veselova
A novel concept of advanced SERS (surface enhanced Raman spectroscopy) planar sensors is suggested for fast analysis of sulfur-containing hazardous oil components and persistent pollutants. The main advantage of the proposed sensors is the utilization of an additional preconcentrating layer of optically transparent chitosan gel, which is chemically modified with appropriate π-acceptor compounds to selectively form charge-transfer complexes (CTCs) at the interface with nanostructured silver coatings. The CTCs shift absorption bands of polycyclic aromatic sulfur heterocycles (PASHs) and other important analytes in a controllable way and thus provide a surplus enhancement of vibration modes due to resonant Raman scattering...
April 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28396219/novel-synthesis-of-steroidal-oximes-and-lactams-and-their-biological-evaluation-as-antiproliferative-agents
#17
Roxana Martínez-Pascual, Socorro Meza-Reyes, José Luis Vega-Baez, Penélope Merino-Montiel, José M Padrón, Ángel Mendoza, Sara Montiel-Smith
A novel three-step methodology to obtain 6a-aza-B-homo steroidal lactams has been developed starting from the easily available cholesterol and pregnenolone. In addition, a new procedure for the synthesis of a 6a-aza-B-homo steroidal lactam analog of vespertilin, starting from diosgenin has been established. In both synthetic pathways, the key intermediate is a hydroxyimino derivative obtained in a one- or two-step sequence from the starting materials. These methods avoid the use of hazardous oxidant agents in the process...
April 7, 2017: Steroids
https://www.readbyqxmd.com/read/28395350/variability-in-heat-strain-in-fully-encapsulated-impermeable-suits-in-different-climates-and-at-different-work-loads
#18
Emiel A DenHartog, Candace D Rubenstein, A Shawn Deaton, Cornelis Peter Bogerd
A major concern for responders to hazardous materials (HazMat) incidents is the heat strain that is caused by fully encapsulated impermeable (NFPA 1991) suits. In a research project, funded by the US Department of Defense, the thermal strain experienced when wearing these suits was studied. Forty human subjects between the ages of 25 and 50 participated in a protocol approved by the local ethical committee. Six different fully encapsulated impermeable HazMat suits were evaluated in three climates: moderate (24°C, 50% RH, 20°C WBGT), warm-wet (32°C, 60% RH, 30°C WBGT), and hot-dry (45°C, 20% RH, 37°C WBGT, 200 W m-2 radiant load) and at three walking speeds: 2...
March 1, 2017: Annals of Work Exposures and Health
https://www.readbyqxmd.com/read/28394431/high-performance-long-term-stable-dopant-free-perovskite-solar-cells-and-additive-free-organic-solar-cells-by-employing-newly-designed-multirole-%C3%AF-conjugated-polymers
#19
Kakaraparthi Kranthiraja, Kumarasamy Gunasekar, Hyunji Kim, An-Na Cho, Nam-Gyu Park, Seonha Kim, Bumjoon J Kim, Ryosuke Nishikubo, Akinori Saeki, Myungkwan Song, Sung-Ho Jin
Perovskite solar cells (PSCs) and organic solar cells (OSCs) are promising renewable light-harvesting technologies with high performance, but the utilization of hazardous dopants and high boiling additives is harmful to all forms of life and the environment. Herein, new multirole π-conjugated polymers (P1-P3) are developed via a rational design approach through theoretical hindsight, further successfully subjecting them into dopant-free PSCs as hole-transporting materials and additive-free OSCs as photoactive donors, respectively...
April 10, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28392910/drug-shortages-in-israel-regulatory-perspectives-challenges-and-solutions
#20
Eyal Schwartzberg, Denize Ainbinder, Alla Vishkauzan, Ronni Gamzu
BACKGROUND: Pharmaceutical drug shortages (DSs) are a global problem which presents challenges to countries around the world. Shortages of pharmaceutical products may have a direct detrimental impact on public health and patients' wellbeing by causing delayed, or even lack of, treatment. Moreover, DSs may force both patients and caregivers to use unfamiliar drugs, which could lead to medication errors. The objective of our study was to analyze DSs in Israel during the years 2013-2015, assessing their etiology and exploring the steps taken for their mitigation and prevention...
2017: Israel Journal of Health Policy Research
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