keyword
MENU ▼
Read by QxMD icon Read
search

Green chemistry

keyword
https://www.readbyqxmd.com/read/28944808/multimodal-porous-carbon-derived-from-ionic-liquids-correlation-between-pore-sizes-and-ionic-clusters
#1
Jun Hui Jeong, Je Seung Lee, Kwang Chul Roh, Kwang-Bum Kim
In this proof of concept study on the synthesis of ionic liquid (IL)-derived multimodal porous carbon using ionic clusters of different sizes as porogens, the carbonization behaviors of binary IL mixtures of 1-ethyl-3-methylimidazolium dicyanamide (EMIM-dca) and 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (EMIM-Tf2N) were systematically investigated to demonstrate the formation of multimodal porous carbons with hierarchical structures originating from the ionic cluster porogens. The multimodal porous structures of the resulting IL-derived porous carbons were characterized based on the quenched solid density functional theory, and the role of the ionic clusters as porogens is discussed...
September 25, 2017: Nanoscale
https://www.readbyqxmd.com/read/28944664/hemiindigo-highly-bistable-photoswitching-at-the-biooptical-window
#2
Christian Petermayer, Stefan Thumser, Florian Kink, Peter Mayer, Henry Dube
Hemiindigo is a long known chromophore that absorbs in the blue part of the spectrum but has almost completely been ignored as potential photoswitch. Herein we show how the absorption of hemiindigo is shifted to the red part of the visible spectrum and how nearly perfect photoswitching can be achieved using blue or green and red light. Five derivatives were investigated giving very high isomeric yields in both switching directions, i.e. >90% E isomer after irradiation with 470 to 530 nm light and 99% Z isomer with 590 up to 680 nm light...
September 25, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28934470/monitoring-replication-protein-a-rpa-dynamics-in-homologous-recombination-through-site-specific-incorporation-of-non-canonical-amino-acids
#3
Nilisha Pokhrel, Sofia Origanti, Eric Parker Davenport, Disha Gandhi, Kyle Kaniecki, Ryan A Mehl, Eric C Greene, Chris Dockendorff, Edwin Antony
An essential coordinator of all DNA metabolic processes is Replication Protein A (RPA). RPA orchestrates these processes by binding to single-stranded DNA (ssDNA) and interacting with several other DNA binding proteins. Determining the real-time kinetics of single players such as RPA in the presence of multiple DNA processors to better understand the associated mechanistic events is technically challenging. To overcome this hurdle, we utilized non-canonical amino acids and bio-orthogonal chemistry to site-specifically incorporate a chemical fluorophore onto a single subunit of heterotrimeric RPA...
September 19, 2017: Nucleic Acids Research
https://www.readbyqxmd.com/read/28934354/synthesis-of-irregular-graphene-oxide-tubes-using-green-chemistry-and-their-potential-use-as-reinforcement-materials-for-biomedical-applications
#4
Ángel Serrano-Aroca, Sanjukta Deb
Micrometer length tubes of graphene oxide (GO) with irregular form were synthesised following facile and green metal complexation reactions. These materials were obtained by crosslinking of GO with calcium, zinc or strontium chlorides at three different temperatures (24, 34 and 55°C) using distilled water as solvent for the compounds and following a remarkably simple and low-cost synthetic method, which employs no hazardous substances and is conducted without consumption of thermal or sonic energy. These irregular continuous GO networks showed a very particular interconnected structure by Field Emission Scanning Electron Microscopy with Energy-Disperse X-Ray Spectroscopy for elemental analysis and High-resolution Transmission Electron Microscopy with Scanning Transmission Electron Microscope Dark Field Imaging, and were analysed by Raman Spectroscopy...
2017: PloS One
https://www.readbyqxmd.com/read/28932860/immobilized-enzymes-understanding-enzyme-surface-interactions-at-the-molecular-level
#5
REVIEW
Marie Hoarau, Somayesadat Badieyan, E Neil G Marsh
Enzymes immobilized on solid supports have important and industrial and medical applications. However, their uses are limited by the significant reductions in activity and stability that often accompany the immobilization process. Here we review recent advances in our understanding of the molecular level interactions between proteins and supporting surfaces that contribute to changes in stability and activity. This understanding has been facilitated by the application of various surface-sensitive spectroscopic techniques that allow the structure and orientation of enzymes at the solid/liquid interface to be probed, often with monolayer sensitivity...
September 21, 2017: Organic & Biomolecular Chemistry
https://www.readbyqxmd.com/read/28923746/diphenyl-diselenide-immobilized-on-magnetic-nanoparticles-a-novel-and-retrievable-heterogeneous-catalyst-in-the-oxidation-of-aldehydes-under-mild-and-green-conditions
#6
Yalda Rangraz, Firouzeh Nemati, Ali Elhampour
In the present study diselenide stabilized on silica coated Fe3O4 magnetic nano particles asa novel, highly efficient and magnetically retrievable heterogeneous catalyst was designed, synthesized and introduced. Full characterization of the newly prepared magnetic nanocatalyst was authenticated using several physico-chemical characterization techniques such as Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), energy-dispersive X-ray spectroscopy (EDX), X-ray diffraction patterns (XRD), field-emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and vibrating sample magnetometer (VSM)...
September 8, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28923702/zinc-oxide-nanoparticles-synthesis-antiseptic-activity-and-toxicity-mechanism
#7
REVIEW
A Król, P Pomastowski, K Rafińska, V Railean-Plugaru, B Buszewski
Zinc oxide (ZnO), as a material with attractive properties, has attracted great interest worldwide, particularly owing to the implementation of the synthesis of nano-sized particles. High luminescent efficiency, a wide band gap (3.36eV), and a large exciton binding energy (60meV) has triggered intense research on the production of nanoparticles using different synthesis methods and on their future applications. ZnO nanomaterials can be used in industry as nano-optical and nano-electrical devices, in food packaging and in medicine as antimicrobial and antitumor agents...
August 26, 2017: Advances in Colloid and Interface Science
https://www.readbyqxmd.com/read/28922915/influence-of-fermentation-temperature-yeast-strain-and-grape-juice-on-the-aroma-chemistry-and-sensory-profile-of-sauvignon-blanc-wines
#8
Rebecca Christina Deed, Bruno Fedrizzi, Richard C Gardner
Sauvignon blanc wine, balanced by herbaceous and tropical aromas, is fermented at low temperatures (10-15 °C). Anecdotal accounts from winemakers suggest that cold ferments produce and retain more 'fruity' aroma compounds; nonetheless, studies have not confirmed why low temperatures are optimal for Sauvignon blanc. Thirty-two aroma compounds were quantitated from two Marlborough Sauvignon blanc juices fermented at 12.5 °C and 25 °C, using Saccharomyces cerevisiae strains EC1118, L-1528, M2 and X5. Fourteen compounds were responsible for driving differences in aroma chemistry...
September 19, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28921969/flow-electrolysis-cells-for-the-synthetic-organic-chemistry-laboratory
#9
Derek Pletcher, Robert A Green, Richard C D Brown
Electrosynthesis has much to offer to the synthetic organic chemist. But in order to be widely accepted as a routine procedure in an organic synthesis laboratory, electrosynthesis needs to be presented in a much more user-friendly way. The literature is largely based on electrolysis in a glass beaker or H-cells that often give poor performance for synthesis with a very slow rate of conversion and, often, low selectivity and reproducibility. Flow cells can lead to much improved performance. Electrolysis is participating in the trend toward continuous flow synthesis, and this has led to a number of innovations in flow cell design that make possible selective syntheses with high conversion of reactant to product with a single passage of the reactant solution through the cell...
September 18, 2017: Chemical Reviews
https://www.readbyqxmd.com/read/28921830/trends-application-and-future-prospectives-of-microbial-carbonic-anhydrase-mediated-carbonation-process-for-ccus
#10
REVIEW
Chintan Bhagat, Pravin Dudhagara, Shantilal Tank
Growing industrialisation and desire for better economy of countries accelerated the emission of greenhouse gasses, more than the buffering capacity of earth atmosphere. Among, various Green House Gasses (GHGs), CO2 occupies the first position in anthroposphere and has detrimental effects on the ecosystem. For decarbonization, several non-biological methods of carbon capture, utilisation, and storage (CCUS) are in use from last few decades, but they are suffering from narrow applicability. Recently, CO2 emission and its disposal related problem encourage for implementation of bioprocessing to achieve zero waste economy for a sustainable environment...
September 18, 2017: Journal of Applied Microbiology
https://www.readbyqxmd.com/read/28917790/a-green-solvent-holder-in-electro-mediated-microextraction-for-the-extraction-of-phenols-in-water
#11
Yu Ting Chong, Marinah Mohd Ariffin, Norhayati Mohd Tahir, Saw Hong Loh
Electro-mediated microextraction (EMM) combined with micro-high performance liquid chromatography-ultraviolet detection was successfully developed for the determination of selected phenols, namely 4-chlorophenol (4CP), 2-nitrophenol (2NP) and 2,4-dichlorophenols (2,4 DCP) in water. A solvent-impregnated agarose gel disc was utilized as a solvent holder in this study. Under optimum extraction conditions, the method showed good linearity in the range of 0.1-250µgL(-1), 0.3-250µgL(-1) and 0.2-500µgL(-1) for 4CP, 2NP and 2,4 DCP, respectively with correlation coefficients of ≥ 0...
January 1, 2018: Talanta
https://www.readbyqxmd.com/read/28913805/real-time-pcr-for-the-detection-of-precise-transgene-copy-number-in-wheat
#12
Angelica Giancaspro, Agata Gadaleta, Antonio Blanco
Despite the unceasing advances in genetic transformation techniques, the success of common delivery methods still lies on the behavior of the integrated transgenes in the host genome. Stability and expression of the introduced genes are influenced by several factors such as chromosomal location, transgene copy number and interaction with the host genotype. Such factors are traditionally characterized by Southern blot analysis, which can be time-consuming, laborious, and often unable to detect the exact copy number of rearranged transgenes...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28913646/computational-investigation-of-the-microstructural-characteristics-and-physical-properties-of-glycerol-based-deep-eutectic-solvents
#13
Tayeb Aissaoui, Yacine Benguerba, Mohamed Khalid AlOmar, Inas M AlNashef
Recently, there has been significant interest in the possibility of using deep eutectic solvents (DESs) as novel green media and alternatives to conventional solvents and ionic liquids (ILs) in many applications. Due to their attractive properties, such as their biodegradability, low cost, easy preparation, and nontoxicity, DESs appear to be very promising solvents for use in the field of green chemistry. This computational study investigated six glycerol-based DESs: DES1 (glycerol:methyl triphenyl phosphonium bromide), DES2 (glycerol:benzyl triphenyl phosphonium chloride), DES3 (glycerol:allyl triphenyl phosphonium bromide), DES4 (glycerol:choline chloride), DES5 (glycerol:N,N-diethylethanolammonium chloride), and DES6 (glycerol:tetra-n-butylammonium bromide)...
September 14, 2017: Journal of Molecular Modeling
https://www.readbyqxmd.com/read/28911110/two-tailed-rt-qpcr-a-novel-method-for-highly-accurate-mirna-quantification
#14
Peter Androvic, Lukas Valihrach, Julie Elling, Robert Sjoback, Mikael Kubista
MicroRNAs are a class of small non-coding RNAs that serve as important regulators of gene expression at the posttranscriptional level. They are stable in body fluids and pose great potential to serve as biomarkers. Here, we present a highly specific, sensitive and cost-effective system to quantify miRNA expression based on two-step RT-qPCR with SYBR-green detection chemistry called Two-tailed RT-qPCR. It takes advantage of novel, target-specific primers for reverse transcription composed of two hemiprobes complementary to two different parts of the targeted miRNA, connected by a hairpin structure...
September 6, 2017: Nucleic Acids Research
https://www.readbyqxmd.com/read/28902167/optimization-and-comparison-of-synthetic-procedures-for-a-group-of-triazinyl-substituted-benzene-sulfonamide-conjugates-with-amino-acids
#15
Dominika Krajčiová, Daniel Pecher, Vladimír Garaj, Peter Mikuš
Sulfonamides incorporating 1,3,5-triazine moieties can selectively and potently inhibit carbonic anhydrase transmembrane isoforms IX, XII, and XIV over cytosolic isoforms I and II. In the present work, a highly effective synthetic procedure was proposed for this group of potent cancerostatic drugs and compared with previously used methods. The synthesis of triazinyl-substituted benzene-sulfonamide conjugates with amino acids can be easily carried out using sodium carbonate-based water solution as a synthetic medium instead of N,N-Diisopropylethylamine/Dimethylformamide...
September 13, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28901581/hybrid-copper-nanowire-reduced-graphene-oxide-coatings-a-green-solution-toward-highly-transparent-highly-conductive-and-flexible-electrodes-for-opto-electronics
#16
Alessandro Aliprandi, Tiago Moreira, Cosimo Anichini, Marc-Antoine Stoeckel, Matilde Eredia, Ugo Sassi, Matteo Bruna, Carlos Pinheiro, César A T Laia, Sara Bonacchi, Paolo Samorì
This study reports a novel green chemistry approach to assemble copper-nanowires/reduced-graphene-oxide hybrid coatings onto inorganic and organic supports. Such films are robust and combine sheet resistances (<30 Ω sq(-1) ) and transparencies in the visible region (transmittance > 70%) that are rivalling those of indium-tin oxide. These electrodes are suitable for flexible electronic applications as they show a sheet resistance change of <4% after 10 000 bending cycles at a bending radius of 1.0 cm, when supported on polyethylene terephthalate foils...
September 13, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28898053/graphene-oxide-an-all-in-one-processing-additive-for-3d-printing
#17
Esther García-Tuñón, Ezra Feilden, Han Zheng, Eleonora D'Elia, Alan Leong, Eduardo Saiz
Many 3D printing technologies are based on the development of inks and pastes to build objects through droplet or filament deposition (the latter also known as continuous extrusion, robocasting, or direct ink writing). Controlling and tuning rheological behavior is key for successful manufacturing using these techniques. Different formulations have been proposed, but the search continues for approaches that are clean, flexible, robust and that can be adapted to a wide range of materials. Here, we show how graphene oxide (GO) enables the formulation of water-based pastes to print a wide variety of materials (polymers, ceramics, and steel) using robocasting...
September 12, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28892402/metformin-a-review-of-characteristics-properties-analytical-methods-and-impact-in-the-green-chemistry
#18
Mariana Teixeira da Trindade, Ana Carolina Kogawa, Hérida Regina Nunes Salgado
Diabetes mellitus is considered a public health problem. The initial treatment consists of improving the lifestyle and making changes in the diet. When these changes are not enough, the use of medication becomes necessary. The metformin aims to reduce the hepatic production of glucose and is the preferred treatment for type 2. The objective is to survey the characteristics and properties of metformin, as well as hold a discussion on the existing analytical methods to green chemistry and their impacts for both the operator and the environment...
September 11, 2017: Critical Reviews in Analytical Chemistry
https://www.readbyqxmd.com/read/28891151/protein-catenation-enhances-both-stability-and-activity-of-folded-structural-domains
#19
Xiaowei Wang, Wenbin Zhang
Catenanes are intriguing molecular architectures with unique properties. Herein, we report the cellular synthesis of protein catenanes containing folded structural domains, aided by the assembly-reaction synergy between the intertwining p53 dimerization and the SpyTag/SpyCatcher chemistry. While concatenation of green fluorescent protein was shown to increase the chemical stability without disrupting the fluorescent properties, concatenated dihydrofolate reductase (DHFR) exhibits a melting temperature ~4 oC higher and a catalytic activity ~27% higher than the wild-type DHFR and the cyclic/linear controls...
September 10, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28890219/use-of-monte-carlo-analysis-in-a-risk-based-prioritization-of-toxic-constituents-in-house-dust
#20
Gary L Ginsberg, Giuliana Belleggia
Many chemicals have been detected in house dust with exposures to the general public and particularly young children of potential health concern. House dust is also an indicator of chemicals present in consumer products and the built environment that may constitute a health risk. The current analysis compiles a database of recent house dust concentrations from the United States and Canada, focusing upon semi-volatile constituents. Seven constituents from the phthalate and flame retardant categories were selected for risk-based screening and prioritization: diethylhexyl phthalate (DEHP), butyl benzyl phthalate (BBzP), diisononyl phthalate (DINP), a pentabrominated diphenyl ether congener (BDE-99), hexabromocyclododecane (HBCDD), tris(1,3-dichloro-2-propyl) phosphate (TDCIPP) and tris(2-chloroethyl) phosphate (TCEP)...
September 7, 2017: Environment International
keyword
keyword
39416
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"