Solvatochromic Probes Behaviour within Ternary Room Temperature 1-Butyl-3-methyl imidazolium tetrafluoroborate + Methanol + Water Solutions

2021 ◽  
pp. 117767
Author(s):  
Md Rabiul Islam ◽  
Maroof Ali
Keyword(s):  
Room Temperature ◽  
Water Solutions ◽  
Solvatochromic Probes

The young hard active Sun: soft X-ray irradiation of tryptophan in water solutions

2010 ◽  
Vol 10 (1) ◽  
pp. 67-75
Author(s):  
A. Ciaravella ◽  
D. Bongiorno ◽  
C. Cecchi-Pestellini ◽  
M.L. Testa ◽  
S. Indelicato ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Significant Role ◽  
Irradiation Dose ◽  
Room Temperature ◽  
Energy Deposition ◽  
Molecular Structures ◽  
X Rays ◽  
X Ray ◽  
Water Solutions ◽  
Isotopic Effects

AbstractThe X-ray emission of the young Sun was much harder and intense than today and might have played a significant role in the evolution of complex organics in protoplanetary environments. We investigate the effects of soft X-rays on tryptophan molecules in aqueous solutions at room temperature. As results of the irradiation experiments we detect several light species indicative of fragmentation, together with large molecular structures such as tryptophan dipeptide and tripeptide. Complexification is more evident in H2O solution than in D2O, probably due to isotopic effects. The abundances of peptides depend on the irradiation dose and decrease with increasing energy deposition. Radicals such as D, OD, H and OH, induced by the X-ray interaction with solvents, play a major role in determining the final products.

Photophysics of hexakis(cyano)chromate(3-) and hexakis(cyano)cobaltate(3-) in polyalcohol-water solutions at room temperature

1979 ◽  
Vol 83 (18) ◽  
pp. 2371-2376 ◽  
Author(s):  
Claudio. Conti ◽  
Francesco. Castelli ◽  
Leslie S. Forster
Keyword(s):  
Room Temperature ◽  
Water Solutions

scholarly journals Taming Troublesome Suzuki-Miyaura Reactions in Water Solution of Surfactants by the Use of Lecithin: A Step Beyond the Micellar Model

2020 ◽  
Author(s):  
Chiara Ceriani ◽  
Erika Ghiglietti ◽  
Mauro Sassi ◽  
Sara Mattiello ◽  
Luca Beverina
Keyword(s):  
Organic Solvents ◽  
Chemical Transformation ◽  
Room Temperature ◽  
Water Solution ◽  
Tween 80 ◽  
Scaling Up ◽  
Strong Reduction ◽  
Water Solutions ◽  
Multiphase Systems ◽  
The Common

<div>The use of water solutions of industrial and designer surfactants enables performing a wide variety of chemical transformation on hydrophobic precursors. Mostly reactions </div><div>are clean, fast and efficient with vast benefits for overall sustainability. The widespread adoption of such methods is somewhat hampered by a lack of generality in the case of troublesome substrates and scaling up. The common literature solution for such issues is the use of small amounts of organic solvents. We here show that the use of a mixture of L-α-lecithin and Tween 80 is a preferable solution enabling the taming of particularly troublesome reactions, where even the cosolvent approach fails. The strong reduction of all interface tensions characterizing such complex multiphase systems is key to the results achieved. The protocol, applied to Suzuki-Miyaura couplings, allows to obtain complete reactions conversion at room temperature within one hour, is general and scalable from milligrams to up to 10 grams without further adjustments.</div>

Transmission Electron Microscopy of microorganism fine structure in dry state

1990 ◽  
Vol 48 (3) ◽  
pp. 584-585
Author(s):  
V. Gerasimov ◽  
V. Volkov
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Fine Structure ◽  
Room Temperature ◽  
Film Formation ◽  
Initial Structure ◽  
Water Solutions ◽  
Transmission Electron

Routine methods for preparing biological specimens for electron microscopy are based on the usage of water solutions of fixatives. The Investigation of microorganisms in anabiosis shows that this results in rehydration of specimens and disturbance of the initial structure. In the paper it is proposed to use the waterless fixatives or the fixatives containing little water in order to analyze the structure of lyophilized microorganisms.Bacteria and yeasts in dry anabiosis were fixed in dehydrated OsO4 vapor. or in 1-2 % OsO4 solution on the basis of 97-95 % water acetone at room temperature for 24-72 h. After fixation, dehydrated microorganisms were placed on the formvar film by suspending cells in 1-4 % formvar solution on the basis of dichlorethan followed by suspension lyophilization on a glass up to film formation.

scholarly journals Preparation of a series of N-alkyl-3-boronopyridinium halides and study of their stability in the presence of hydrogen peroxide

2012 ◽  
Vol 10 (4) ◽  
pp. 1059-1065 ◽  
Author(s):  
Yevgen Karpichev ◽  
Hubert Matondo ◽  
Illia Kapitanov ◽  
Oleksandr Savsunenko ◽  
Marc Vedrenne ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Reaction Time ◽  
Thermal Degradation ◽  
Microwave Irradiation ◽  
Room Temperature ◽  
Ester Hydrolysis ◽  
Water Solutions ◽  
Boronic Ester ◽  
Wide Ph Range ◽  
Ph Range

AbstractA simple and efficient protocol for the preparation of a series of N-alkyl-3-boronopyridinium salts is described which requires exposure of 3-pyridineboronic acid neopentylglycol ester and corresponding alkyle halide to microwave irradiation followed by boronic ester hydrolysis. The technique employed drastically reduces the reaction time and prevents thermal degradation and the formation of side products. Water solutions of the obtained boronopyridinium salts are shown to be stable at room temperature in wide pH range as well as in the presence of hydrogen peroxide at pH 10.0 for 72 h.

scholarly journals Taming Troublesome Suzuki-Miyaura Reactions in Water Solution of Surfactants by the Use of Lecithin: A Step Beyond the Micellar Model

2020 ◽  
Author(s):  
Chiara Ceriani ◽  
Erika Ghiglietti ◽  
Mauro Sassi ◽  
Sara Mattiello ◽  
Luca Beverina
Keyword(s):  
Organic Solvents ◽  
Chemical Transformation ◽  
Room Temperature ◽  
Water Solution ◽  
Tween 80 ◽  
Scaling Up ◽  
Strong Reduction ◽  
Water Solutions ◽  
Multiphase Systems ◽  
The Common

<div>The use of water solutions of industrial and designer surfactants enables performing a wide variety of chemical transformation on hydrophobic precursors. Mostly reactions </div><div>are clean, fast and efficient with vast benefits for overall sustainability. The widespread adoption of such methods is somewhat hampered by a lack of generality in the case of troublesome substrates and scaling up. The common literature solution for such issues is the use of small amounts of organic solvents. We here show that the use of a mixture of L-α-lecithin and Tween 80 is a preferable solution enabling the taming of particularly troublesome reactions, where even the cosolvent approach fails. The strong reduction of all interface tensions characterizing such complex multiphase systems is key to the results achieved. The protocol, applied to Suzuki-Miyaura couplings, allows to obtain complete reactions conversion at room temperature within one hour, is general and scalable from milligrams to up to 10 grams without further adjustments.</div>

scholarly journals Bacteria Supported on Carbon-Coated Monoliths for Water Denitrification

2020 ◽  
Vol 6 (4) ◽  
pp. 77
Author(s):  
David Espinosa-Iglesias ◽  
Esther Bailón-García ◽  
Mª Isidora Bautista-Toledo ◽  
Francisco Carrasco-Marín ◽  
Agustín F. Pérez-Cadenas
Keyword(s):  
Escherichia Coli ◽  
Flow Velocity ◽  
Room Temperature ◽  
Carbon Layer ◽  
Experimental Conditions ◽  
Water Solutions ◽  
Bacteria Growth ◽  
Carbon Coated ◽  
Escherichia Coli Bacteria ◽  
Monolithic Structures

Escherichia coli bacteria were grown inside the channels of cordierite monoliths previously coated with a very good adhered carbon layer. These monolithic structures were tested at room temperature for the nitrate elimination of water solutions working as a batch monolithic bioreactor and showed very good results, as 100% of the nitrates and nitrites were completely removed in the used experimental conditions. Different rate flows of bacteria growth and nitrate elimination were studied, showing that the higher the flow velocity, the faster the nitrate elimination. Finally, the reproducibility tests confirmed the good performance of the proposed bioreactor.

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