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https://www.readbyqxmd.com/read/28810197/photochemical-formation-of-chitosan-stabilized-near-infrared-absorbing-silver-nanoworms-a-green-synthetic-strategy-and-activity-on-gram-negative-pathogenic-bacteria
#1
Sreekar Marpu, Samar S Kolailat, Daniel Korir, Brian L Kamras, Ratnesh Chaturvedi, Abel Joseph, Christopher M Smith, Misael C Palma, Jyoti Shah, Mohammad A Omary
A facile, single-step, non-seeded photochemical protocol for producing a new type of anisotropic silver nanostructure, "nanoworms", with curved longer dimensions and smooth, rounded edges. The nanoworms exhibit surface plasmon resonance (SPR) absorption in the near-infrared window (NIRW) region and are stabilized using biocompatible polymer chitosan, rendering biocompatibility and amplified safety for biological utility of the composition. Both NIRW-absorbing nanoworms and visible-absorbing nanospheres herein are attained exclusively by employing green chemistry principles...
August 4, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28808963/extraction-and-qpcr-based-detection-of-mirnas-from-cultured-pbmcs-of-bubaline-origin
#2
Chandra S Mukhopadhyay, Ramneek Verma, Jasdeep Singh
MicroRNAs are small noncoding but functionally important RNA molecules that are involved in regulating diverse cellular, metabolic, and immune processes. Their small size necessitates modification in traditional acid phenol-chloroform based RNA isolation procedures to get highly enriched fraction of small RNA that includes miRNAs and siRNAs . Further, of the different methods available, real-time PCR is a powerful tool for precise and specific detection and quantification of miRNA. Moreover, real-time PCR is used to validate the screening or expression of miRNAs that are discovered during high-throughput sequencing, or microarray analysis...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28794956/recent-progress-on-deep-eutectic-solvents-in-biocatalysis
#3
REVIEW
Pei Xu, Gao-Wei Zheng, Min-Hua Zong, Ning Li, Wen-Yong Lou
Deep eutectic solvents (DESs) are eutectic mixtures of salts and hydrogen bond donors with melting points low enough to be used as solvents. DESs have proved to be a good alternative to traditional organic solvents and ionic liquids (ILs) in many biocatalytic processes. Apart from the benign characteristics similar to those of ILs (e.g., low volatility, low inflammability and low melting point), DESs have their unique merits of easy preparation and low cost owing to their renewable and available raw materials...
2017: Bioresources and Bioprocessing
https://www.readbyqxmd.com/read/28794946/synthesis-of-wavelength-shifting-fluorescent-dna-and-rna-with-two-photostable-cyanine-styryl-dyes-as-the-base-surrogate-pair
#4
Jeannine Steinmeyer, Franziska Rönicke, Ute Schepers, Hans-Achim Wagenknecht
Two nucleic acid building blocks were synthesized, consisting of two photostable green- and red-emitting cyanine-styryl dyes and (S)-3-amino-1,2-propanediol as a substitute for the ribofuranoside, and incorporated as base-pair surrogates by using automated phosphoramidte chemistry in the solid phase. The optical properties and, in particular, the energy-transfer properties were screened in a range of DNA duplexes, in which the "counter bases" of the two dyes were varied and the distance between the two dyes was enlarged to up to three intervening adenosine-thymidine pairs...
August 2017: ChemistryOpen
https://www.readbyqxmd.com/read/28791862/surface-charge-induced-efficient-recovery-of-ionic-liquids-from-aqueous-phase
#5
Li Li, Li Chang, Xiqi Zhang, Hongliang Liu, Lei Jiang
Ionic liquids (ILs), which consist of pure cations and anions, are widely used in diverse applications and regarded as one of the best choices of "green solvents". However, the lack of effective green methods for recovering ILs and the safety issues caused by entering environment severely hinder the application of ILs in green chemistry. Here, we show that rationally tuning surface charge of a poly(tert-butyl acrylate) (PtBA)-coated porous mesh can selectively let ILs pass through, and thus provides an efficient and convenient strategy to recover ILs from aqueous phase...
August 9, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28779775/13-freiburger-symposium-2017-green-chemistry-from-concept-to-industrial-reality
#6
Kerstin Bodmann, Roger Marti
No abstract text is available yet for this article.
August 9, 2017: Chimia
https://www.readbyqxmd.com/read/28775395/enzymatic-oligomerization-and-polymerization-of-arylamines-state-of-the-art-and-perspectives
#7
REVIEW
Gordana Ćirić-Marjanović, Maja Milojević-Rakić, Aleksandra Janošević-Ležaić, Sandra Luginbühl, Peter Walde
The literature concerning the oxidative oligomerization and polymerization of various arylamines, e.g., aniline, substituted anilines, aminonaphthalene and its derivatives, catalyzed by oxidoreductases, such as laccases and peroxidases, in aqueous, organic, and mixed aqueous organic monophasic or biphasic media, is reviewed. An overview of template-free as well as template-assisted enzymatic syntheses of oligomers and polymers of arylamines is given. Special attention is paid to mechanistic aspects of these biocatalytic processes...
2017: Chemické Zvesti
https://www.readbyqxmd.com/read/28770933/exploring-catalyst-passivation-with-nmr-relaxation
#8
Neil Robinson, Lynn F Gladden, Carmine D'Agostino
NMR relaxation has recently emerged as a novel and non-invasive tool for probing the surface dynamics of adsorbate molecules within liquid-saturated mesoporous catalysts. The elucidation of such dynamics is of particular relevance to the study and development of solvated green catalytic processes, such as the production of chemicals and fuels from bio-resources. In this paper we develop and implement a protocol using high field (1)H NMR spin-lattice relaxation as a probe of the reorientational dynamics of liquids imbibed within mesoporous oxide materials...
August 3, 2017: Faraday Discussions
https://www.readbyqxmd.com/read/28759069/the-mechanism-for-the-formation-of-oh-radicals-in-condensed-phase-water-under-ultraviolet-irradiation
#9
Fan Jin, Min Wei, Chengbu Liu, Yuchen Ma
Irradiation on liquid water and ice by ultraviolet light in the range of 150-200 nm can create volatile OH radicals which react with other organic and inorganic molecules actively. However, the mechanism for OH radical formation in the condensed-phase water in this energy range is still unclear. To uncover this mechanism we studied the excited-state behaviors of ice using first-principles calculations based on many-body Green's function theory. First, we showed that the long-wavelength optical absorption at the Urbach tail (190-300 nm) can be attributed to inherent hydroxide ions or transient structures formed in the autoionization process...
August 16, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28753729/safety-evaluation-of-green-tea-polyphenols-consumption-in-middle-aged-ovariectomized-rat-model
#10
Chwan-Li Shen, Gordon Brackee, Xiao Song, Michael D Tomison, VelvetLee Finckbone, Kelly T Mitchell, Lili Tang, Ming-Chien Chyu, Dale M Dunn, Jia-Sheng Wang
This work evaluates chronic safety in middle-aged ovariectomized rats supplemented with different dosages of green tea polyphenols (GTP) in drinking water. The experiment used 6-mo-old sham (n = 39) and ovariectomized (OVX, n = 143) female rats. All sham (n = 39) and 39 of the OVX animals received no GTP treatment and their samples were collected for outcome measures at baseline, 3 mo, and 6 mo (n = 13 per group for each). The remaining OVX animals were randomized into 4 groups receiving 0.15%, 0.5%, 1%, and 1...
July 28, 2017: Journal of Food Science
https://www.readbyqxmd.com/read/28753277/theoretical-s1-s0-absorption-energies-of-the-anionic-forms-of-oxyluciferin-by-variational-monte-carlo-and-many-body-green-s-function-theory
#11
Emanuele Coccia, Daniele Varsano, Leonardo Guidoni
The structures of three negatively charged forms (anionic keto-1 and enol-1, dianonic enol-2) of oxyluciferin (OxyLuc), which are the most probable emitters responsible for the firefly bioluminescence, have been fully relaxed at the variational Monte Carlo (VMC) level. Absorption energies of the S1 <- S0 vertical transition have been computed using different levels of theory, such as TDDFT, CC2 and many body Green's function Theory (MBGFT). The use of MBGFT, by means of the Bethe-Salpeter (BS) formalism, on VMC structures provides results in excellent agreement with the value (2...
July 28, 2017: Journal of Chemical Theory and Computation
https://www.readbyqxmd.com/read/28734297/nonequilibrium-phase-coexistence-and-criticality-near-the-second-explosion-limit-of-hydrogen-combustion
#12
Lucas B Newcomb, Mohammad Alaghemandi, Jason R Green
While hydrogen is a promising source of clean energy, the safety and optimization of hydrogen technologies rely on controlling ignition through explosion limits: pressure-temperature boundaries separating explosive behavior from comparatively slow burning. Here, we show that the emergent nonequilibrium chemistry of combustible mixtures can exhibit the quantitative features of a phase transition. With stochastic simulations of the chemical kinetics for a model mechanism of hydrogen combustion, we show that the boundaries marking explosive domains of kinetic behavior are nonequilibrium critical points...
July 21, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28732982/sonochemical-green-reduction-to-prepare-ag-nanoparticles-decorated-graphene-sheets-for-catalytic-performance-and-antibacterial-application
#13
Sayan Ganguly, Poushali Das, Madhuparna Bose, Tushar Kanti Das, Subhadip Mondal, Amit Kumar Das, Narayan C Das
The emerging popularity and wide acceptance of green chemistry and environmentally benign/ecofriendly approaches have comprehensively considered for catalyst synthesis methods. Natural resource derived carbogenic quantum dots has been used in assistance with ultrasonic shock wave to graphene oxide (GO) aqueous dispersion in order to prepare reduced graphene oxide decorated with silver nanoparticles following the 'top-down' method. The total reduction process is done without using any toxic external reducing agents and any surfactants or stabilizers, thus it can be accepted as green method...
November 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28732952/ultrasound-promoted-direct-functionalization-of-multi-walled-carbon-nanotubes-in-water-via-diels-alder-click-chemistry
#14
Cuong M Q Le, Xuan Thang Cao, Kwon Taek Lim
A facile and environmentally friendly strategy for grafting polymers onto the surface of multi-walled carbon nanotubes (CNTs) was demonstrated by Diels-Alder "click chemistry". Firstly, the copolymers of poly(styrene-alt-maleic anhydride) (PSM) were prepared by the reversible addition-fragmentation chain transfer (RAFT) polymerization and subsequently functionalized with furfuryl amine to introduce anchoring groups. The copolymers were then grafted on CNTs via the Diels-Alder reaction in water through a conventional heating-stirring route and ultrasound-assisted method...
November 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28723168/enhanced-room-temperature-oxygen-sensing-properties-of-laocl-sno2-hollow-spheres-by-uv-light-illumination
#15
Ya Xiong, Wenbo Lu, Degong Ding, Lei Zhu, Xiaofang Li, Cuicui Ling, Qingzhong Xue
In this paper, a facile and elegant Green Chemistry method for the synthesis of SnO2 based hollow spheres has been investigated. The influences of doping, crystallite morphology, and operating condition on the O2 sensing performances of SnO2 based hollow-sphere sensors were comprehensively studied. It was indicated that, compared with undoped SnO2, 10 at. % LaOCl-doped SnO2 possessed better O2 sensing characteristics owing to an increase of specific surface area and oxygen vacancy defect caused by LaOCl dopant...
May 26, 2017: ACS Sensors
https://www.readbyqxmd.com/read/28722734/scavenging-and-recombination-kinetics-in-radiation-chemistry
#16
Eyad H Al-Samra, Nicholas J B Green
This work describes stochastic models developed to study the competition between radical scavenging and recombination for simple model systems typical of radiation chemistry, where the reactive particles are tightly clustered and reactions are assumed fully diffusion limited. Three models are developed: a Monte Carlo random flights model with a periodic boundary condition for scavengers, Monte Carlo simulations in which the scavenging rate is calculated from the Smoluchowski theory for diffusion-limited reactions and a modification of the independent reaction times method where the scavengers close to the spur are explicitly included and the scavengers further away are treated as a continuum...
July 19, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28717021/genetic-and-metabolic-engineering-in-diatoms
#17
REVIEW
Weichao Huang, Fayza Daboussi
Diatoms have attracted considerable attention due to their success in diverse environmental conditions, which probably is a consequence of their complex origins. Studies of their metabolism will provide insight into their adaptation capacity and are a prerequisite for metabolic engineering. Several years of investigation have led to the development of the genome engineering tools required for such studies, and a profusion of appropriate tools is now available for exploring and exploiting the metabolism of these organisms...
September 5, 2017: Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
https://www.readbyqxmd.com/read/28714902/fluorescence-modulation-of-green-fluorescent-protein-using-fluorinated-unnatural-amino-acids
#18
Jordan K Villa, Hong-Anh Tran, Megha Vipani, Stephanie Gianturco, Konark Bhasin, Brent L Russell, Elizabeth J Harbron, Douglas D Young
The ability to modulate protein function through minimal perturbations to amino acid structure represents an ideal mechanism to engineer optimized proteins. Due to the novel spectroscopic properties of green fluorescent protein, it has found widespread application as a reporter protein throughout the fields of biology and chemistry. Using site-specific amino acid mutagenesis, we have incorporated various fluorotyrosine residues directly into the fluorophore of the protein, altering the fluorescence and shifting the pKa of the phenolic proton associated with the fluorophore...
July 16, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28707240/elemental-mobility-in-sulfidic-mine-tailings-reclaimed-with-paper-mill-by-products-as-sealing-materials
#19
Yu Jia, Nanna Stahre, Maria Mäkitalo, Christian Maurice, Björn Öhlander
Sealing layers made of two alkaline paper mill by-products, fly ash and green liquor dregs, were placed on top of 50-year-old sulfide-containing tailings as a full-scale remediation approach. The performance and effectiveness of the sealing layers with high water content for an oxygen barrier and low hydraulic conductivity for a sealing layer in preventing the formation of acid rock drainage were evaluated 5 years after the remediation. The leaching behavior of the covered tailings was studied using batch leaching tests (L/S ratio 10 L/kg)...
July 13, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28703094/dynamic-headspace-sampling-as-an-initial-step-for-sample-preparation-in-chromatographic-analysis
#20
Wojciech Wojnowski, Tomasz Majchrzak, Tomasz Dymerski, Jacek Gębicki, Jacek Namieśnik
This work represents a brief summary of the use of dynamic headspace (DHS) as a technique for sample preparation in chromatographic analysis. Despite numerous developments in the area of analyte isolation and enrichment, DHS remains one of the fundamental methods used with GC. In our opinion, interest in this technique will not diminish significantly because it conforms to stipulations of green analytical chemistry. Moreover, DHS fulfills the need for methods that facilitate detection and determination of analytes present at ultratrace levels in complex matrices...
July 13, 2017: Journal of AOAC International
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