Results 51 to 60 of about 30,690 (171)

Reaction Pathway and Rovibrational Analysis of Aluminum Nitride Species as Potential Dust Grain Nucleation Agents

open access: yesThe Astrophysical Journal
A dust nucleating agent may be present in interstellar or circumstellar media that has gone seemingly undetected and unstudied for decades. Some analyses of the Murchison CM2 meteorite suggest that at least some of the aluminum present within condensed ...
C. Zachary Palmer, Ryan C. Fortenberry
doaj   +1 more source

Quantum chemical calculations and spectroscopic measurements of spectroscopic and thermodynamic properties of given uranyl complexes in aqueous solutions with possible environmental and industrial applications

open access: yesEPJ Web of Conferences, 2016
A brief introduction into computational methodology and preliminary results for spectroscopic (excitation energies, vibrational frequencies in ground and excited electronic states) and thermodynamic (stability constants, standard enthalpies and entropies
Višňak Jakub, Sobek Lukáš
doaj   +1 more source

Chemical Sensors and Computer-Aided Analytical Chemistry

open access: yesCHIMIA, 1997
A simplified thermodynamic model of potentiometric and optical ion sensor membranes allows to improve their properties and the measurement of complex formation constants in membrane phases.
Ernö Pretsch
doaj   +2 more sources

4-Bromobenzene Sulfonate Derivatives: Synthesis, Characterization, DFT and Molecular Docking Study

open access: yesActa Chimica Slovenica
4-bromobenzenesulfonate derivatives (I and II) were prepared and characterized by FTIR and NMR spectroscopic methods and density functional theory. Acceptable deviations were found where the scaled vibrational frequencies at B3LYP/6-311++G(d,p) were ...
Meryem Evecen   +3 more
doaj   +1 more source

Rheological Modeling, Spectroscopic and Physicochemical Characterization of Raphia hookeri (RH) Gum Exudate

open access: yesWalailak Journal of Science and Technology, 2014
Raphia hookeri (RH) gum exudate has been analysed for physical (colour, odour, taste, pH, salinity, turbidity), chemical (solubility in some solvents, proximate/elemental composition, vitamin composition, phytochemicals and anti-nutrients) and ...
Nnabuk Okon EDDY   +4 more
doaj   +1 more source

Konformationsanalyse und Kinetik der Konformationsänderungen von membranaktiven Antibiotika

open access: yesCHIMIA, 1972
Molecular properties of the membrane active antibiotics enniatin B, valinomycin and gramicidin A were investigated in various solvents. The conformational rearrangements of these antibiotics have been studied as a function of solvent polarity by ...
E. Grell, F. Eggers, Th. Funck
doaj   +1 more source

Synthesis and Spectroscopic Characterization of Interstellar Candidate Ethynyl Thiocyanate: HCCSCN

open access: yesThe Astrophysical Journal
This work aims to spectroscopically characterize and provide for the first time direct experimental frequencies of the ground vibrational state and two excited states of the simplest alkynyl thiocyanate (HCCSCN) for astrophysical use.
Elena R. Alonso   +12 more
doaj   +1 more source

Interaction of Aromatic Amino Acids with Metal Complexes of Tetrakis-(4-Sulfonatophenyl)Porphyrin

open access: yesMolecules
The interaction of a series of metal derivatives of 5, 10, 15, 20-tetrakis(4-sulfonato-phenyl)porphyrin (MTPPS4, M = Cu(II), Pt(II), Ni(II), Zn(II) and Co(II)), including the metal free porphyrin (TPPS4), with the aromatic amino acids L-tryptophan (L-Trp)
Roberto Zagami   +4 more
doaj   +1 more source

Hydrogen concentration at a-Si:H/c-Si heterointerfaces—The impact of deposition temperature on passivation performance

open access: yesAIP Advances, 2019
We studied the effect of deposition temperature on the hydrogen distribution and the passivation performance of hydrogenated amorphous silicon (a-Si:H) coated crystalline silicon (c-Si) heterojunctions as a model of high efficiency solar cell structures.
Kazuhiro Gotoh   +6 more
doaj   +1 more source

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