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https://www.readbyqxmd.com/read/28821140/the-potential-of-cashew-gum-functionalization-as-building-blocks-for-layer-by-layer-films
#1
Álvaro J Leite, Rui R Costa, Ana M S Costa, Jeanny S Maciel, José F G Costa, Regina C M de Paula, João F Mano
Cashew gum (CG), an exudate polysaccharide from Anacardium occidentale trees, was carboxymethylated (CGCm) and oxidized (CGO). These derivatives were characterized by FTIR and zeta potential measurements confirming the success of carboxymethylation and oxidation reactions. Nanostructured multilayered films were then produced through layer-by-layer (LbL) assembly in conjugation with chitosan via electrostatic interactions or Schiff bases covalent bonds. The films were analyzed by QCM-D and AFM. CG functionalization increased the film thickness, with the highest thickness being achieved for the lowest oxidation degree...
October 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28821139/charge-functionalized-and-mechanically-durable-composite-cryogels-from-q-nfc-and-cs-for-highly-selective-removal-of-anionic-dyes
#2
Yufei Chen, Jing Ru, Biyao Geng, Haiying Wang, Congcong Tong, Chungui Du, Shengchun Wu, Hongzhi Liu
A composite cryogel was prepared from quaternized nanofibrillated cellulose (Q-NFC) and chitosan (CS) through a combination of freeze-drying and cross-linking with epichlorohydrin. The specific surface area of the composite cryogel was approximately two times that of Q-NFC cryogel. And the composite cryogel exhibited superior adsorption properties of anionic dyes than either the Q-NFC or CS cryogel controls. The adsorption isotherm well fitted the Langmuir model with the maximum theoretical adsorption capacity up to 473...
October 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28821101/cholesteric-film-of-cu-ii-doped-cellulose-nanocrystals-for-colorimetric-sensing-of-ammonia-gas
#3
Shidong Dai, Nana Prempeh, Dagang Liu, Yimin Fan, Mingyue Gu, Yu Chang
With the increasing demand of environmental monitoring for toxic and odorous ammonia gas it is desired to develop specific green, cost-effective and in situ passive colorimetric alternatives to current complex instrumentations. In this work, we designed an ammonia gas sensor based on cholesteric liquid crystal films of copper(II)-doped cellulose nanocrystals (CNCCu(II)) whose structure, optical and sensing properties were investigated. The hybrid films using the low doping Cu(II) as a color-tuning agent inherited the chiral nematic signature and optical activity of CNCs, suggesting a strong chelation between copper ions and negatively charged CNCs...
October 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28821075/rapid-fabrication-of-transparent-film-directly-from-wood-fibers-with-microwave-assisted-ionic-liquids-technology
#4
Pengbo Lu, Fan Cheng, Yanghao Ou, Meiyan Lin, Lingfeng Su, Size Chen, Xilang Yao, Detao Liu
Presently flexibly transparent film or nanopaper from all cellulose was mostly fabricated by assembling cellulose nanofibers disintegrated from macroscopic wood fibers which mostly suffers from potential environmental toxicity or high cost. In this work, we firstly reported an all-cellulose transparent film fabricated by a novel microwave-assisted ionic liquids technology (MILT). The use of MILT for treating the original all-cellulose paper brings nearly 2.6 fold-increases in optical transmission, and 2.0 fold-increases in tensile property compared to those without microwave assistance...
October 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28821062/cell-wall-polysaccharides-from-pulp-and-peel-of-cubiu-a-pectin-rich-fruit
#5
Cristiane Colodel, Rosane Maria das Graças Bagatin, Talita Maria Tavares, Carmen Lúcia de Oliveira Petkowicz
To investigate the polysaccharides of cubiu (Solanum sessiliflorum D.) fruits, pulp and peel were subjected to sequential extractions using different solvents, giving rise to pectins heterogeneous with respect to their structural characteristics, xylan, arabinogalactoxyloglucans and glucomannans. Chemical, physicochemical and spectroscopic analyses were used to characterize the polysaccharides obtained. Pectins with uronic acid content of commercial grade were obtained from the peel of cubiu fruits using water (25°C and 100°C) and EDTA and from its pulp using water (100°C)...
October 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28821050/clean-approach-to-synthesis-of-graphene-like-cufe2o4-polysaccharide-resin-nanohybrid-bifunctional-compound-for-dye-adsorption-and-bacterial-capturing
#6
Mostafa Hossein Beyki, Sarina Ehteshamzadeh Ganjbakhsh, Sara Minaeian, Farzaneh Shemirani
Focus of this research is on employment of a green route to prepare magnetic CuFe2O4@polysaccharide resin for environmental remediation purpose. The method is including solvent free solid state synthesis of copper ferrite nanoparticles by combustion route using cellulose as fuel. Then polysaccharide resin as well as its magnetic composite was prepared by using glucose, citric acid and copper ferrite as solid raw materials. Characterization study using FESEM and TEM images showed that as synthesized resin possesses graphene like structure as ferrite nanoparticles are dispersed in the matrice of resin...
October 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28821037/effects-of-esterification-on-the-structural-physicochemical-and-flocculation-properties-of-dextran
#7
Ruo-Han Li, Tao Zeng, Min Wu, Hong-Bin Zhang, Xue-Qin Hu
Dextran is an interesting starting material to design new functional polymers by chemical modification. Potential applications of dextran in water treatment should be increasingly developed and the structure properties of dextran derivatives should be focused on. In the study, dextran ester was synthesized through the esterification reaction of hydroxyl. The structure and some physicochemical properties of synthesized dextran ester were characterized and further analyzed. And we found that dextran ester could exert desirable flocculation performance in both kaolin and sugarcane juice under acidic conditions but not lower than pH 4...
October 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28821010/willingness-to-pay-for-safe-drinking-water-a-contingent-valuation-study-in-jacksonville-fl
#8
Chiradip Chatterjee, Russell Triplett, Christopher K Johnson, Parvez Ahmed
A surprising number of U.S. cities have drinking water with unhealthy levels of chemicals and contaminants. The city of Jacksonville (Florida), the location for this study, owns the dubious distinction of being ranked among the worst major American cities in water quality according to water quality tests conducted between 2005 and 2009 by the Environmental Working Group (EWG). This report of toxic chemicals in the Jacksonville water supply generated considerable negative publicity and coincides with a frequent and common complaint among residents of foul-smelling water...
August 15, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28821001/influence-on-serum-asymmetric-dimethylarginine-adma-concentrations-of-human-paraoxonase-1-polymorphism-q192r-and-exposure-to-polycyclic-aromatic-hydrocarbons-pahs-in-mexican-women-a-gene-environment-interaction
#9
Ángeles C Ochoa-Martínez, Tania Ruíz-Vera, Claudia I Almendarez-Reyna, Sandra T Orta-García, Iván N Pérez-Maldonado
It has been demonstrated that Cardiovascular Diseases (CVD) are a consequence of the combination of genetic and environmental factors and/or the interaction between them. Therefore, the aim of this study was to evaluate the impact of polycyclic aromatic hydrocarbon (PAHs) exposure and PON1 Q192R polymorphism (genetic susceptibility) on serum asymmetric dimethylarginine (ADMA) levels in Mexican women (n = 206). Urinary 1-hydroxypyrene concentrations (1-OHP; exposure biomarker for PAHs) were quantified using a high-performance liquid chromatography technique, PON1 Q192R polymorphism was genotyped using TaqMan probes and serum ADMA concentrations were evaluated using a commercially available ELISA kit...
August 13, 2017: Chemosphere
https://www.readbyqxmd.com/read/28820995/influence-of-monitoring-data-selection-for-optimization-of-a-steady-state-multimedia-model-on-the-magnitude-and-nature-of-the-model-prediction-bias
#10
Hee Seok Kim, Dong Soo Lee
SimpleBox is an important multimedia model used to estimate the predicted environmental concentration for screening-level exposure assessment. The main objectives were (i) to quantitatively assess how the magnitude and nature of prediction bias of SimpleBox vary with the selection of observed concentration data set for optimization and (ii) to present the prediction performance of the optimized SimpleBox. The optimization was conducted using a total of 9604 observed multimedia data for 42 chemicals of four groups (i...
August 12, 2017: Chemosphere
https://www.readbyqxmd.com/read/28820980/isotope-fractionation-in-phase-transfer-processes-under-thermodynamic-and-kinetic-control-implications-for-diffusive-fractionation-in-aqueous-solution
#11
Frank-Dieter Kopinke, Anett Georgi, Ulf Roland
Diffusive isotope fractionation of organic compounds in aqueous solution was investigated by means of liquid-liquid and liquid-gas partitioning experiments under kinetic control. The two-film model was used to describe phase-transfer kinetics. It assumes the diffusion of solutes across a stagnant water boundary layer as the rate-controlling step. For all investigated solutes (benzene-D0 and -D6, toluene-D0, -D5, and -D8, cyclohexane-D0 and -D12), there was no significant observable fractionation effect between nondeuterated and perdeuterated isotopologues, resulting in a ratio of diffusion coefficients Dlight: Dheavy=1...
August 15, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28820978/concentration-addition-and-independent-action-model-which-is-better-in-predicting-the-toxicity-for-metal-mixtures-on-zebrafish-larvae
#12
Yongfei Gao, Jianfeng Feng, Lili Kang, Xin Xu, Lin Zhu
The joint toxicity of chemical mixtures has emerged as a popular topic, particularly on the additive and potential synergistic actions of environmental mixtures. We investigated the 24h toxicity of Cu-Zn, Cu-Cd, and Cu-Pb and 96h toxicity of Cd-Pb binary mixtures on the survival of zebrafish larvae. Joint toxicity was predicted and compared using the concentration addition (CA) and independent action (IA) models with different assumptions in the toxic action mode in toxicodynamic processes through single and binary metal mixture tests...
August 14, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28820962/wanted-alive-finding-bacteria-in-your-food
#13
Akira Kawamura
In this issue of Cell Chemical Biology, Pezacki and co-workers (Sherratt et al., 2017) report a simple method to metabolically label viable bacteria, which can be used to detect and capture foodborne pathogens. The method may also find many other applications because it can be used to recover live cells, pathogens and non-pathogens, from various biomedical and environmental samples.
August 17, 2017: Cell Chemical Biology
https://www.readbyqxmd.com/read/28820910/impaired-dendritic-growth-and-positioning-of-cortical-pyramidal-neurons-by-activation-of-aryl-hydrocarbon-receptor-signaling-in-the-developing-mouse
#14
Eiki Kimura, Ken-Ichiro Kubo, Toshihiro Endo, Wenting Ling, Kazunori Nakajima, Masaki Kakeyama, Chiharu Tohyama
The basic helix-loop-helix (bHLH) transcription factors exert multiple functions in mammalian cerebral cortex development. The aryl hydrocarbon receptor (AhR), a member of the bHLH-Per-Arnt-Sim subfamily, is a ligand-activated transcription factor reported to regulate nervous system development in both invertebrates and vertebrates, but the functions that AhR signaling pathway may have for mammalian cerebral cortex development remains elusive. Although the endogenous ligand involved in brain developmental process has not been identified, the environmental pollutant dioxin potently binds AhR and induces abnormalities in higher brain function of laboratory animals...
2017: PloS One
https://www.readbyqxmd.com/read/28820903/prominent-facilitation-at-beta-and-gamma-frequency-range-revealed-with-physiological-calcium-concentration-in-adult-mouse-piriform-cortex-in-vitro
#15
Marie Gleizes, Simon P Perrier, Caroline Fonta, Lionel G Nowak
Neuronal activity is characterized by a diversity of oscillatory phenomena that are associated with multiple behavioral and cognitive processes, yet the functional consequences of these oscillations are not fully understood. Our aim was to determine whether and how these different oscillatory activities affect short-term synaptic plasticity (STP), using the olfactory system as a model. In response to odorant stimuli, the olfactory bulb displays a slow breathing rhythm as well as beta and gamma oscillations...
2017: PloS One
https://www.readbyqxmd.com/read/28820643/a-prototype-ice-melting-probe-for-collecting-biological-samples-from-cryogenic-ice-at-low-pressure
#16
Ashley Davis
In the Solar System, the surface of an icy moon is composed of irregular ice formations at cryogenic temperatures (<200 K), with an oxidized surface layer and a tenuous atmosphere at very low pressure (<10(-6) atm). A lander mission, whose aim is to collect and analyze biological samples from the surface ice, must contain a device that collects samples without refreezing liquid and without sublimation of ice. In addition, if the samples are biological in nature, then precautions must be taken to ensure the samples do not overheat or mix with the oxidized layer...
August 2017: Astrobiology
https://www.readbyqxmd.com/read/28820632/media-presentation-of-breastfeeding-beliefs-in-newspapers
#17
Rose Hitt, Jie Zhuang, Jennifer Anderson
Despite numerous health benefits for babies and mothers, many women do not either initiate or continue breastfeeding for the recommended duration, and increasing breastfeeding is a national priority. It is important to understand media messages on the topic, given that breastfeeding is influenced by many environmental factors and that perceived norms, social support, and perceptions of difficulties predict breastfeeding. The current study analyzes how media covers (1) breastfeeding in general, (2) public breastfeeding, and (3) extended breastfeeding (past 1 year)...
August 18, 2017: Health Communication
https://www.readbyqxmd.com/read/28820615/looking-back-and-then-forward-to-solve-our-environmental-health-problems
#18
Mary B Rice, Jonathan M Samet
N/A.
August 18, 2017: Annals of the American Thoracic Society
https://www.readbyqxmd.com/read/28820581/a-simple-approach-to-the-visible-light-photoactivation-of-molecular-metal-oxides
#19
Satomi Fujimoto, Jamie M Cameron, Rong-Jia Wei, Katharina Kastner, David Robinson, Victor Sans, Graham N Newton, Hiroki Oshio
This study explores a new method to maximize the visible-light-driven photocatalytic performance of organic-inorganic hybrid polyoxometalates (POMs). Experimental and theoretical investigations of a family of phosphonate-substituted POMs show that modification of grafted organic moieties can be used to tune the electronic structure and photoactivity of the metal oxide component. Unlike fully inorganic polyoxotungstates, these organic-inorganic hybrid species are responsive to visible light and function as photocatalysts (λ > 420 nm) in the decomposition of a model environmental pollutant...
August 18, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28820489/the-effect-of-hydrogen-bonding-in-enhancing-the-ionic-affinities-of-immobilized-monoprotic-phosphate-ligands
#20
Spiro D Alexandratos, Xiaoping Zhu
Environmental remediation requires ion-selective polymers that operate under a wide range of solution conditions. In one example, removal of trivalent and divalent metal ions from waste streams resulting from mining operations before they enter the environment requires treatment at acidic pH. The monoethyl ester phosphate ligands developed in this report operate from acidic solutions. They have been prepared on polystyrene-bound ethylene glycol, glycerol, and pentaerythritol, and it is found that intra-ligand hydrogen bonding affects their metal ion affinities...
August 18, 2017: Materials
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