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Wyświetlanie 1-3 z 3
Tytuł:
Numerical methods in understanding reaction pathways NOx oxidation
Autorzy:
Jaroszyńska-Wolińska, J.
Malinowski, S.
Powiązania:
https://bibliotekanauki.pl/articles/390595.pdf
Data publikacji:
2016
Wydawca:
Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
Tematy:
NO
NO2
O3
DFT
CASSCF
CCSD
MP2
Opis:
Different quantum chemical models were applied in energetic analysis of the process of oxidation of NO and NO2 through reaction with ozone generated by non-thermal equilibrium (low temperature), atmospheric pressure plasma. The potential energy surfaces of systems comprising NO and NO2 with ozone were characterized. The NOx oxidation processes well known, at the molecular level, were modelled by ab initio quantum chemistry methods to calculate the total reaction energy, Et, of each step in the reaction chain. Quantum chemistry was further applied in an attempt to detect the presence of any transition states and to calculate the activation energy, Ea, of reactions (1) NO + O3 and (2) NO2 + O3 using the MP2 level of theory with three different basis sets and fine potential energy scan resolution.
Źródło:
Budownictwo i Architektura; 2016, 15, 3; 75-81
1899-0665
Pojawia się w:
Budownictwo i Architektura
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Właściwości wewnątrzcząsteczkowych wiązań wodorowych w wybranych N-tlenkach pochodnych chinoliny
Intramolecular hydrogen bonds properties in selected N-oxides of quinoline derivatives
Autorzy:
Jezierska, Aneta
Panek, Jarosław J.
Błaziak, Kacper
Powiązania:
https://bibliotekanauki.pl/articles/171511.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Chemiczne
Tematy:
DFT
teoria funkcjonału gęstości
MP2
metoda rachunku zaburzeń drugiego rzędu Møllera-Plesseta
CPMD
dynamika molekularna Cara-Parrinello
wewnątrzcząsteczkowe wiązanie wodorowe
N-tlenki pochodnych chinoliny
density functional theory
Møller-Plesset second order perturbation method
Car-Parrinello molecular dynamics
intramolecular HB
N-oxides of quinoline derivatives
Opis:
In the current article we would like to summarize our research shedding light onto properties of intramolecular hydrogen bonds present in N-oxide quinoline derivatives. The compounds for the current study were chosen to contain diverse types of hydrogen bonds. Therefore, in the current study we analyze three kinds of hydrogen bonding and their properties. It is well known, that the presence of intramolecular hydrogen bonds stabilizes conformations of molecules. Substituent effects (inductive and steric) influence the strength of the H-bonding as well as its features. Moreover, the intramolecular hydrogen bond in the studied N-oxides belongs to the family of resonance assisted hydrogen bonds (RAHB). Our short overview presents the summary of results obtained for twelve N-oxides of quinoline derivatives. Quantum-chemical simulations were performed on the basis of static models (classical DFT and MP2 approaches) as well as ab initio molecular dynamics (Car-Parrinello MD). The metadynamics method was applied to reproduce the maps of free energy for the motion of the bridged proton. The computations were performed in the gas and in the crystalline phases. Electronic ground state is a natural framework in which chemical compounds exist most of the time. However, in many chemical species we observe a spontaneous internal reorganization of their chemical bonds and atoms e.g. proton transfer phenomenon and the appearance of tautomeric forms already in the ground state. Therefore, it was interesting to investigate some N-oxides in the excited electron state knowing that they exhibit excited- state-induced proton transfer (ESIPT effect). At the end of the article we draw some conclusions related to the intramolecular H-bond properties present in the discussed N-oxides of quinoline derivatives.
Źródło:
Wiadomości Chemiczne; 2019, 73, 1-2; 75-95
0043-5104
2300-0295
Pojawia się w:
Wiadomości Chemiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Molecular basis of cellulose biosynthesis disappearance in submerged culture of Acetobacter xylinum
Autorzy:
Krystynowicz, Alina
Koziołkiewicz, Maria
Wiktorowska-Jezierska, Agnieszka
Bielecki, Stanisław
Klemenska, Emilia
Masny, Aleksander
Płucienniczak, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/1041378.pdf
Data publikacji:
2005
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
2-D electrophoresis
UDP-glucose pyrophosphorylase
phosphoglucomutase
bacterial cellulose
Acetobacter xylinum
PCR-MP
Opis:
Acetobacter xylinum strains are known as very efficient producers of bacterial cellulose which, due to its unique properties, has great application potential. One of the most important problems faced during cellulose synthesis by these bacteria is generation of cellulose non-producing cells, which can appear under submerged culture conditions. The reasons of this remain unknow. These studies have been undertaken to compare at the molecular level wild-type, cellulose producing (Cel+) A. xylinum strains with Cel- forms of cellulose-negative phenotype. Comparison of protein profiles of both forms of A. xylinum by 2D electrophoresis allowed for the isolation of proteins which were produced exclusively by either Cel+ or Cel- cells. Sequences of peptides derived from these proteins were aligned with those of proteins deposited in databases. This analysis revealed that Cel- cells lacked two enzymes: phosphoglucomutase and glucose-1-phosphate uridylyltransferase, which generates UDP-glucose being the substrate for cellulose synthase. DNA was analyzed by ligation-mediated PCR carried out at low denaturation temperature (PCR-MP). Two DNA fragments of different thermal stability (218 and 217 bp) were obtained from the DNA of Cel+ and Cel- forms, respectively. The only difference between these Cel- and Cel+ DNA fragments is deletion of one T residue. Alignment of those two sequences with those deposited in the GenBank database revealed that similar fragments are present in the genomes of some bacterial cellulose producers and are located downstream from open reading frames (ORF) encoding phosphoglucomutase. The meaning of this observation is discussed.
Źródło:
Acta Biochimica Polonica; 2005, 52, 3; 691-698
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-3 z 3

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