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https://www.readbyqxmd.com/read/28230803/one-pot-conversion-of-epoxidized-soybean-oil-eso-into-soy-based-polyurethanes-by-mocl%C3%A2-o%C3%A2-catalysis
#1
Vincenzo Pantone, Cosimo Annese, Caterina Fusco, Paola Fini, Angelo Nacci, Antonella Russo, Lucia D'Accolti
An innovative and eco-friendly one-pot synthesis of bio-based polyurethanes is proposed via the epoxy-ring opening of epoxidized soybean oil (ESO) with methanol, followed by the reaction of methoxy bio-polyols intermediates with 2,6-tolyl-diisocyanate (TDI). Both synthetic steps, methanolysis and polyurethane linkage formation, are promoted by a unique catalyst, molybdenum(VI) dichloride dioxide (MoCl₂O₂), which makes this procedure an efficient, cost-effective, and environmentally safer method amenable to industrial scale-up...
February 21, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28229194/screening-level-assessment-of-metal-concentrations-in-streambed-sediments-and-floodplain-soils-within-the-grand-lake-watershed-in-northeastern-oklahoma-usa
#2
Ean M Garvin, Cas F Bridge, Meredith S Garvin
Metal releases have been received by the Grand Lake watershed from the Tri-State Mining District (TSMD) since the mid 1800s. To address data gaps in metal distributions in the Oklahoma portion of the watershed, streambed sediment and floodplain soil was sampled on various streams. The <63-µm fraction was analyzed for Cd, Pb, and Zn concentrations by portable X-ray fluorescence spectroscopy and inductively coupled plasma-mass spectrometry. Mean metal concentration results at reference transects indicated that background sediment/soil concentrations for Cd, Pb, and Zn within the watershed were 0...
February 22, 2017: Archives of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/28224972/a-mathematical-model-for-the-two-learners-problem
#3
Jan Mueller, Carmen Vidaurre, Martijn Schreuder, Frank Meinecke, Paul von Bünau, Klaus-Robert Mueller
OBJECTIVE: We present the first generic theoretical formulation of the co-adaptive learning problem and give a simple example of two interacting linear learning systems, a human and a machine. APPROACH: After the description of the training protocol of the two learning systems, we define a simple linear model where the two learning agents are coupled by a joint loss function. The simplicity of the model allows us to find learning rules for both human and machine that permit computing theoretical simulations...
February 22, 2017: Journal of Neural Engineering
https://www.readbyqxmd.com/read/28224230/newly-isolated-bacillus-sp-g51-from-patagonian-wool-produces-an-enzyme-combination-suitable-for-felt-resist-treatments-of-organic-wool
#4
Martín S Iglesias, Cynthia Sequeiros, Sebastián García, Nelda L Olivera
Bacteria from Patagonian Merino wool were isolated to assess their wool-keratinolytic activity and potential for felt-resist treatments. Strains from Bacillus, Exiguobacterium, Deinococcus, and Micrococcus produced wool-degrading enzymes. Bacillus sp. G51 showed the highest wool-keratinolytic activity. LC-MS/MS analysis revealed that G51 secreted two serine proteases belonging to the peptidase family S8 (MEROPS) and a metalloprotease associated with Bacillolysin, along with other enzymes (γ-glutamyltranspeptidase and dihydrolipoyl dehydrogenases) that could be involved in reduction of keratin disulfide bonds...
February 21, 2017: Bioprocess and Biosystems Engineering
https://www.readbyqxmd.com/read/28223076/leaching-of-rare-earth-elements-from-fluorescent-powder-using-the-tea-fungus-kombucha
#5
Stefanie Hopfe, Katrin Flemming, Falk Lehmann, Robert Möckel, Sabine Kutschke, Katrin Pollmann
In most modern technologies such as flat screens, highly effective magnets and lasers, as well as luminescence phosphors, Rare Earth Elements (REE) are used. Unfortunately no environmentally friendly recycling process exists so far. In comparison to other elements the interaction of microorganisms with REE has been studied to a less extent. However, as REE are ubiquitously present in nature it can be assumed that microorganisms play an important role in the biogeochemistry of REE. This study investigates the potential of organic acid-producing microbes for extracting REE from industrial waste...
February 17, 2017: Waste Management
https://www.readbyqxmd.com/read/28222385/the-effects-of-autohydrolysis-pretreatment-on-the-structural-characteristics-adsorptive-and-catalytic-properties-of-the-activated-carbon-prepared-from-eucommia-ulmoides-oliver-based-on-a-biorefinery-process
#6
Ming-Qiang Zhu, Zhi-Wen Wang, Jia-Long Wen, Ling Qiu, Ya-Hong Zhu, Yin-Quan Su, Qin Wei, Run-Cang Sun
Eucommia ulmoides Oliver (EU) wood was consecutively treated by autohydrolysis pretreatment and chemical carbonization post-treatment based on a biorefinery process. Results showed that the optimal condition of the autohydrolysis pretreatment and carbonization process yielded 10.37kg xylooligosaccharides (XOS), 1.39kg degraded hemicellulosic products, 17.29kg other degraded products from hemicelluloses and 40.72kg activated carbon (SBET of 1534.06m(2)/g) from the 100kg raw materials. Simultaneously, 29.14kg gas products generated from the optimum integrated process was significantly lower than that from the direct carbonization process (68...
February 11, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28221833/evolution-of-thermal-reaction-norms-in-seasonally-varying-environments
#7
Priyanga Amarasekare, Christopher Johnson
Thermal reaction norms of ectotherms exhibit a distinctive latitudinal pattern: the temperature at which performance is maximized coincides with the mean habitat temperature in tropical ectotherms but exceeds the mean temperature in temperate ectotherms. We hypothesize, on the basis of Jensen's inequality, that this pattern is driven by latitudinal variation in seasonal temperature fluctuations. We test this hypothesis with an eco-evolutionary model that integrates the quantitative genetics of reaction norm evolution with stage-structured population dynamics, which we parameterize with data from insects...
March 2017: American Naturalist
https://www.readbyqxmd.com/read/28220835/effects-of-abiotic-factors-on-ecosystem-health-of-taihu-lake-china-based-on-eco-exergy-theory
#8
Ce Wang, Jun Bi, Brian D Fath
A lake ecosystem is continuously exposed to environmental stressors with non-linear interrelationships between abiotic factors and aquatic organisms. Ecosystem health depicts the capacity of system to respond to external perturbations and still maintain structure and function. In this study, we explored the effects of abiotic factors on ecosystem health of Taihu Lake in 2013, China from a system-level perspective. Spatiotemporal heterogeneities of eco-exergy and specific eco-exergy served as thermodynamic indicators to represent ecosystem health in the lake...
February 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28220234/prevalence-of-dieting-and-fear-of-weight-gain-across-ages-a-community-sample-from-adolescents-to-the-elderly
#9
Margarita C T Slof-Op 't Landt, Eric F van Furth, Catharina E M van Beijsterveldt, Meike Bartels, Gonneke Willemsen, Eco J de Geus, Lannie Ligthart, Dorret I Boomsma
OBJECTIVES: The current study aimed to define the prevalence of dieting and fear of weight gain among men and women across the entire lifespan and identify factors associated with them. METHODS: Data were available for 31,636 participants (60.2% women; age 13-98 years) from the Netherlands Twin Register. Dieting and fear of weight gain were described by age and sex. Associations with BMI, exercise behavior, urbanization and educational attainment were examined by regression analyses in 19,294 participants...
February 20, 2017: International Journal of Public Health
https://www.readbyqxmd.com/read/28219038/green-synthesis-characterization-and-catalytic-activity-of-silver-nanoparticles-using-cassia-auriculata-flower-extract-separated-fraction
#10
Karuppiah Muthu, Sethuraman Priya
Cassia auriculata L., the flower aqueous extract was fractionated by separating funnel using n-hexane (A1), chloroform (A2), ethyl acetate (A3) and triple distilled water (A4). The A4 fraction was concentrated and determined the presence of preliminary phytochemicals such as tannins, flavonoids, glycosides, carbohydrates and polyphenolic compounds. These phytochemical compounds acted as reducing as well as a stabilizing agent in the green synthesis of Ag NPs from aqueous silver ions. Initially, the colour change and UV-vis absorbance surface Plasmon resonance strong, wide band located at 435nm has confirmed the synthesis of Ag NPs...
February 12, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28216654/performance-kinetic-and-biodegradation-pathway-evaluation-of-anaerobic-fixed-film-fixed-bed-reactor-in-removing-phthalic-acid-esters-from-wastewater
#11
Ehsan Ahmadi, Samira Yousefzadeh, Mohsen Ansari, Hamid Reza Ghaffari, Ali Azari, Mohammad Miri, Alireza Mesdaghinia, Ramin Nabizadeh, Babak Kakavandi, Peyman Ahmadi, Mojtaba Yegane Badi, Mitra Gholami, Kiomars Sharafi, Mostafa Karimaei, Mahboobeh Ghoochani, Masoud Binesh Brahmand, Seyed Mohsen Mohseni, Maryam Sarkhosh, Soheila Rezaei, Hosseinali Asgharnia, Emad Dehghanifard, Behdad Jafari, Alireza Mortezapour, Vahid Kazemi Moghaddam, Mohammad Molla Mahmoudi, Nader Taghipour
Emerging and hazardous environmental pollutants like phthalic acid esters (PAEs) are one of the recent concerns worldwide. PAEs are considered to have diverse endocrine disrupting effects on human health. Industrial wastewater has been reported as an important environment with high concentrations of PAEs. In the present study, four short-chain PAEs including diallyl phthalate (DAP), diethyl phthalate (DEP), dimethyl phthalate (DMP), and phthalic acid (PA) were selected as a substrate for anaerobic fixed film fixed bed reactor (AnFFFBR)...
February 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28216617/eco-friendly-superwetting-material-for-highly-effective-separations-of-oil-water-mixtures-and-oil-in-water-emulsions
#12
Chih-Feng Wang, Sheng-Yi Yang, Shiao-Wei Kuo
Because the treatment of oily wastewater, generated from many industrial processes, has become an increasing environmental concern, the search continues for simple, inexpensive, eco-friendly, and readily scalable processes for fabricating novel materials capable of effective oil/water separation. In this study we prepared an eco-friendly superhydrophilic and underwater superoleophobic polyvinylpyrrolidone (PVP)-modified cotton that mediated extremely efficient separations of mixtures of oil/water and oil/corrosive solutions...
February 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28215785/kinetics-of-exhaled-carbon-monoxide-following-waterpipe-smoking-indoors-and-outdoors
#13
Agnes Juhasz, Dalma Pap, Imre Barta, Orsolya Drozdovszky, Andrea Egresi, Balazs Antus
BACKGROUND: Despite accumulating evidence about its adverse health effects, waterpipe tobacco smoking has become very popular among youth. The aim of this study was to compare smoke exposure and the kinetics of exhaled carbon monoxide (eCO) between waterpipe and cigarette smokers under different conditions. METHODS: Using a cross-over study design, changes in eCO and urinary cotinine levels were measured in a cohort of 32 healthy university students following sessions of waterpipe smoking indoor and outdoor...
February 16, 2017: Chest
https://www.readbyqxmd.com/read/28215448/evolution-in-a-community-context-on-integrating-ecological-interactions-and-macroevolution
#14
REVIEW
Marjorie G Weber, Catherine E Wagner, Rebecca J Best, Luke J Harmon, Blake Matthews
Despite a conceptual understanding that evolution and species interactions are inextricably linked, it remains challenging to study ecological and evolutionary dynamics together over long temporal scales. In this review, we argue that, despite inherent challenges associated with reconstructing historical processes, the interplay of ecology and evolution is central to our understanding of macroevolution and community coexistence, and cannot be safely ignored in community and comparative phylogenetic studies...
February 16, 2017: Trends in Ecology & Evolution
https://www.readbyqxmd.com/read/28214444/the-boosted-biomass-and-lipid-accumulation-in-chlorella-vulgaris-by-supplementation-of-synthetic-phytohormone-analogs
#15
Tingting Liu, Fei Liu, Chao Wang, Zhenyao Wang, Yuqin Li
This study attempted at maximizing biomass and lipid accumulation in Chlorella vulgaris by supplementation of natural abscisic acid (ABA) or synthetic 2,4-dichlorophenoxyacetic acid (2,4-D) and 1-naphthaleneacetic acid (NAA) hormone analogs. Amongst three tested additives, NAA-treatment performed remarkable promoting effect on cell growth and lipid biosynthesis. The favorable lipid productivity (418.6mg/L/d) of NAA-treated cells showed 1.48 and 2.24 times more than that of 2,4-D and ABA. NAA-treatment also positively modified the proportions of saturated (C16:0 and C18:0) and monounsaturated fatty acids (C18:1) which were prone to high-quality biofuels-making...
February 7, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28214191/potential-of-different-am-fungi-native-from-as-contaminated-and-uncontaminated-soils-for-supporting-leucaena-leucocephala-growth-in-as-contaminated-soil
#16
Jerusa Schneider, Jochen Bundschuh, Wesley de Melo Rangel, Luiz Roberto Guimarães Guilherme
Arbuscular mycorrhizal (AM) fungi inoculation is considered a potential biotechnological tool for an eco-friendly remediation of hazardous contaminants. However, the mechanisms explaining how AM fungi attenuate the phytotoxicity of metal(oid)s, in particular arsenic (As), are still not fully understood. The influence of As on plant growth and the antioxidant system was studied in Leucaena leucocephala plants inoculated with different isolates of AM fungi and exposed to increasing concentrations of As (0, 35, and 75 mg dm(-3)) in a Typic Quartzipsamment soil...
February 14, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28214179/mixture-toxicity-of-flubendazole-and-fenbendazole-to-daphnia-magna
#17
Alan Puckowski, Stefan Stolte, Marta Wagil, Marta Markiewicz, Paulina Łukaszewicz, Piotr Stepnowski, Anna Białk-Bielińska
Nowadays, residual amounts of many pharmaceuticals can be found in various environmental compartments including surface and ground waters, soils and sediments as well as biota. Even though they undergo degradability, their environmental discharge is relatively continuous, thus they may be regarded as quasi-persistent contaminants, and are also frequently regarded as emerging organic pollutants. Benzimidazoles, especially flubendazole (FLU) and fenbendazole (FEN), represent two anthelmintic drugs belonging to this group...
February 3, 2017: International Journal of Hygiene and Environmental Health
https://www.readbyqxmd.com/read/28213661/biotransformation-of-rutin-using-crude-enzyme-from-rhodopseudomonas-palustris
#18
Chun-Jie Guan, Yu-Jia Ji, Jia-Lin Hu, Chao-Nan Hu, Fei Yang, Guan-E Yang
Rhodopseudomonas palustris was selected for the ability to grow in diglycosylated flavonoids-based media, exhibited deglycosylation activity. The present study aimed to investigate the ability of a crude enzyme from Rhodopseudomonas palustris to transform rutin. Our results showed the crude enzyme was found to transform rutin to quercetin via isoquercitrin. The maximum enzyme activities were observed at pH 7.0, 25 °C, and rutin concentration of 1.0 mg mL(- 1). Under optimal conditions, 13.11 μM rutin was biotransformed into 6...
February 17, 2017: Current Microbiology
https://www.readbyqxmd.com/read/28212931/uv-protective-poly-lactic-acid-rosin-films-for-sustainable-packaging
#19
Meenu Narayanan, Sravanthi Loganathan, Ravi Babu Valapa, Sabu Thomas, T O Varghese
Recently, biopolymer based plastic materials are regarded as potential alternative for conventional plastics of fossil fuel origin in order to compensate depleting petroleum resources and address environmental pollution issues. Poly(lactic acid) (PLA) is one among the biopolymers which is rapidly commercialized for food packaging application. However, the demerits accompanied with PLA like brittle nature, slower crystallization rate, poor gas barrier and high ultraviolet radiation transmission properties confines its commercial application in food packaging sector...
February 14, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28212869/improvement-of-simultaneous-cr-vi-and-phenol-removal-by-an-immobilised-bacterial-consortium-and-characterisation-of-biodegradation-products
#20
Ornella M Ontañon, Paola S González, Germán Barros, Elizabeth Agostini
Microbial bioremediation emerged some decades ago as an eco-friendly technology to restore polluted sites. Traditionally, the search for microorganisms suitable for bioremediation has been based on the selection of isolated strains able to remove a specific type of pollutant. However, this strategy has now become obsolete, since co-pollution is a global reality. Thus, current studies attempt to find bacterial cultures capable of coping with a mixture of organic and inorganic compounds. In this sense, the bacterial consortium SFC 500-1 has demonstrated efficiency for Cr(VI) and phenol removal, both of which are found in many industrial wastewaters...
February 14, 2017: New Biotechnology
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