0000000000365210

AUTHOR

Paulina H. Marek

showing 3 related works from this author

Formation of Variously Shaped Gold Nanoparticles by Anabaena laxa

2017

Anew aspect of this study is the biocatalysis ability of Anabaena laxa—fresh-water strain—which to date has not been studied with respect to the formation of gold nanoparticles. The results of our study have shown that A. laxa is able to form gold nanoparticles (AuNPs) at good yields within 24 h of incubation at all three tested concentrations (0.1, 0.5 and 1 mM) of hydrogen tetrachloroaurate (III). After 24 h, nanoparticles were mostly localized in the growth medium, which significantly facilitates their isolation. However, the elongation of this process is accompanied by their concentration in the exopolysaccharide (EPS) layer of the cyanobacterial cells. There is a correlation between th…

NanochemistryNanoparticle02 engineering and technology010402 general chemistrycyanobacteria01 natural sciencesBiochemistryCatalysischemistry.chemical_compoundGeneral Materials Sciencebiocatalytic formationGrowth mediumbiologyAnabaenaGeneral Chemistry021001 nanoscience & nanotechnologyCondensed Matter Physicsbiology.organism_classification0104 chemical scienceschemistryChemical engineeringBiocatalysisColloidal goldgold nanoparticlesAnabaena laxaElongation0210 nano-technologyJournal of Cluster Science
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Aromaticity of the most stable adenine and purine tautomers in terms of Hückel's 4N+2 principle

2019

Abstract Electron structures of the fused rings in 7H and 9H tautomers of purine and adenine follow the 4N + 2 rule; the values of pEDA, HOMA, NICS and FLU indices document their aromatic character. In the 1H and 3H tautomers, these rings contain five or seven π electrons, hence they do not follow this rule and consequently exhibit lower aromaticity. This also applies to the aromaticity of whole molecules.

PurineAromaticity010405 organic chemistryAdenineOrganic ChemistryAromaticityElectron010402 general chemistry01 natural sciencesBiochemistryTautomerTautomer0104 chemical sciencesHückel rulechemistry.chemical_compoundCharacter (mathematics)chemistryComputational chemistryDrug DiscoveryMoleculePurineTetrahedron
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Substituent effects on the stability of the four most stable tautomers of adenine and purine

2019

Substituent effects at the C2-, C8- and N-positions of adenine and purine in their four the most stable tautomers are studied by means of B97D3/aug-cc-pvdz computation applying substituents of varying electronic properties: NO2, CN, CHO, Cl, F, H, Me, OMe, OH and NH2. The substituent effect is characterized by the substituent effect stabilization energy (SESE) and substituent Hammett constant σ. For adenine, SESE is obtained with purine as the reference system. Additionally, for both adenine and purine, SESE characteristics are estimated with benzene, imidazole and amino-pyrimidine as reference systems, when possible, taking into account substitution in topologically equivalent positions. T…

PurineStereochemistryGeneral Chemical EngineeringSubstituent02 engineering and technologyGeneral Chemistry010402 general chemistry021001 nanoscience & nanotechnology01 natural sciencesTautomer0104 chemical scienceschemistry.chemical_compoundchemistryImidazoleSubstitution effect0210 nano-technologyBenzeneProximity effect (atomic physics)Electronic propertiesRSC Advances
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