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Photoluminiscent diamond nanoparticles - new diagnostic and visualization probes
Cígler, Petr
2012 - anglický
Selected problems connected with surface modification of nanosized diamond crystals, attachment of chemical sensing architectures to them and their colloidal stability were addressed. Fluorescent nanodiamonds modified by proper functional structures were shown as unique unbleachable nanoprobes for construction of future sensors useful in biological and medicinal applications.
Klíčová slova:
nanodiamond; fluorescence probe; nanosensor
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Photoluminiscent diamond nanoparticles - new diagnostic and visualization probes
Selected problems connected with surface modification of nanosized diamond crystals, attachment of chemical sensing architectures to them and their colloidal stability were addressed. Fluorescent ...
Influence of the O-phosphorylation of serine, threonine and tyrosine in proteins on the amidic N-15 chemical shielding anisotropy tensors
Emmer, J.; Vavrinská, A.; Sychrovský, Vladimír; Benda, Ladislav; Kříž, Z.; Koča, J.; Boelens, R.; Sklenář, V.; Trantírek, L.
2012 - anglický
Density functional theory was employed to study the influence of O-phosphorylation of serine, threonine, and tyrosine on the amidic N-15 chemical shielding anisotropy (CSA) tensor in the context of the complex chemical environments of protein structures.
Klíčová slova:
15N CSA; protein phosphorylation; DFT
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Influence of the O-phosphorylation of serine, threonine and tyrosine in proteins on the amidic N-15 chemical shielding anisotropy tensors
Density functional theory was employed to study the influence of O-phosphorylation of serine, threonine, and tyrosine on the amidic N-15 chemical shielding anisotropy (CSA) tensor in the context of ...
Molecular simulations unravel preference of haloalkanes for the air/water interface
Habartová, Alena; Minofar, Babak; Obisesan, A.; Roeselová, Martina
2012 - anglický
Halogenated organics are emitted into the atmosphere from a variety of sources of both natural and anthropogenic origin (Finlayson-Pitts et al., 2000). Their uptake at the surface of aerosols can affect their reactivity, for example in processes which take part in ozone destruction due to production of reactive chlorine, bromine and iodine radicals. This study presents results of molecular dynamic (MD) simulations carried out to investigate the interaction of short-chain haloalkanes with aqueous surfaces. We report on a free energy minimum that the haloalkanes exhibit at the air/water interface.
Klíčová slova:
haloalkanes; aqueous solvation; molecular dynamics simulations
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Molecular simulations unravel preference of haloalkanes for the air/water interface
Halogenated organics are emitted into the atmosphere from a variety of sources of both natural and anthropogenic origin (Finlayson-Pitts et al., 2000). Their uptake at the surface of aerosols can ...
Application of capillary electrophoresis in forensic science: Analysis of fireworks
Eliáš, Milan; Maier, V.; Knob, R.
2012 - anglický
In all samples of fireworks, K+, Na+, Ca2+ and Mg2+ ions were proved and quantified by the method of capillary zone electrophoresis using water solution of 10 mM 4-aminopyridine, titrated with hydroxyisobutyric acid to the pH 4.3, as background electrolyte and indirect UV-absorption detection at 200 nm. Pb2+ or Ba2+ ions were proved in few samples. The other selected inorganic cations were not proved in any sample of selected fireworks. NH4+ ions were not detected in any pre-blast samples, but they were established in some post-blast (glazed tiles) samples.
Klíčová slova:
capillary zone electrophoresis; metal cations; fireworks
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Application of capillary electrophoresis in forensic science: Analysis of fireworks
In all samples of fireworks, K+, Na+, Ca2+ and Mg2+ ions were proved and quantified by the method of capillary zone electrophoresis using water solution of 10 mM 4-aminopyridine, titrated with ...
Open-tubular capillary electrochromatography with bare gold nanoparticles-based stationary phase applied to separation of trypsin digested proteins
Mikšík, Ivan; Lacinová, Kateřina; Zmatlíková, Zdeňka; Sedláková, Pavla; Král, V.; Sýkora, D.; Řezanka, P.; Kašička, Václav
2012 - anglický
Open-tubular capillary electrochromatography (OT-CEC) using bare gold nanoparticles-based stationary phase has been applied to separation of tryptic peptide fragments of native and glycated proteins, bovine serum albumin and human transferrin. OT-CEC with bare gold nanoparticles stationary phase was found to be a suitable technique for separation of complex peptide mixtures originating from enzymatic (tryptic) digestion of native and glycated bovine serum albumin and human transferrin, and for glycation studies of these proteins.
Klíčová slova:
open-tubular capillary electrochromatography; gold nanoparticles; glycation of proteins
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Open-tubular capillary electrochromatography with bare gold nanoparticles-based stationary phase applied to separation of trypsin digested proteins
Open-tubular capillary electrochromatography (OT-CEC) using bare gold nanoparticles-based stationary phase has been applied to separation of tryptic peptide fragments of native and glycated proteins, ...
Separation and determination of isoelectric points of GnRH peptides by capillary electrophoresis in conventional and carrier ampholytes-based background electrolytes
Šolínová, Veronika; Poitevin, M.; Barth, Tomislav; Peltre, G.; Kašička, Václav
2012 - anglický
Two mixtures of human and salmon gonadotropin releasing hormone (GnRH) derived peptides were successfully separated by capillary zone electrophoresis (CZE) in six classical buffer-based BGEs and by carrier ampholytes-based capillary electrophoresis (CABCE) in the same number carrier ampholytes-based isoelectric BGEs of the same or close pH values. In addition, from the pH dependence of peptide electrophoretic mobilities, the isolectric points of separated peptides were determined.
Klíčová slova:
capillary zone electrophoresis; carrier ampholytes; GnRH peptides
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Separation and determination of isoelectric points of GnRH peptides by capillary electrophoresis in conventional and carrier ampholytes-based background electrolytes
Two mixtures of human and salmon gonadotropin releasing hormone (GnRH) derived peptides were successfully separated by capillary zone electrophoresis (CZE) in six classical buffer-based BGEs and by ...
Capillary electrophoretic chiral analysis and estimation of helix inversion barrier of helquats using randomly sulfated cyclodextrins as chiral selectors
Kašička, Václav; Koval, Dušan; Sázelová, Petra; Severa, Lukáš; Adriaenssens, Louis; Vávra, Jan; Teplý, Filip
2012 - anglický
Capillary electrophoresis in acidic sodium phosphate background electrolyte, pH 2.4, with randomly sulfated alpha-, beta- and gamma-cyclodextrins as chiral selectors was employed for fast, high-resolution separation of enantiomers of a series of 24 helquats, a new class of N-heteroaromatic dicationic helicene-like species. The developed CE methodology will be utilized in the further investigation of helquats, e.g., in evaluation of their preparative enantioresolution procedures, in monitoring of their racemization and determination of interconversion barrier of helquat enantiomers.
Klíčová slova:
helquat chiral analysis; capillary electrophoresis; sulfated cyclodextrins
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Capillary electrophoretic chiral analysis and estimation of helix inversion barrier of helquats using randomly sulfated cyclodextrins as chiral selectors
Capillary electrophoresis in acidic sodium phosphate background electrolyte, pH 2.4, with randomly sulfated alpha-, beta- and gamma-cyclodextrins as chiral selectors was employed for fast, ...
Chiral analysis of beta-alanyl-D,L-tyrosine and its derivatives by capillary electrophoresis with 2-hydroxypropyl-beta-cyclodextrin stereoselector
Sázelová, Petra; Šolínová, Veronika; Schimperková, Tereza; Mášová, Alice; Jiráček, Jiří; Kašička, Václav
2012 - anglický
A new capillary electrophoretic method was developed for separation of enantiomers of antimicrobial dipeptide betha-Ala-D,L-Tyr and its derivatives using 50 mM Tris-phosphate, pH 2.50, as background electrolyte and 2-hydroxypropyl-betha-cyclodextrin at concentrations 20 – 60 mg/mL as chiral selector. In addition, association constants of complexes of the enatiomers of dipeptide betha-Ala-D,L-Tyr and its derivatives with 2-hydroxypropyl-betha-cyclodextrin chiral selector were determined.
Klíčová slova:
capillary zone electrophoresis; antimicrobial peptides; chiral analysis
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Chiral analysis of beta-alanyl-D,L-tyrosine and its derivatives by capillary electrophoresis with 2-hydroxypropyl-beta-cyclodextrin stereoselector
A new capillary electrophoretic method was developed for separation of enantiomers of antimicrobial dipeptide betha-Ala-D,L-Tyr and its derivatives using 50 mM Tris-phosphate, pH 2.50, as background ...
Does oxidation make the organic aerosol coatings more hydrophilic? Insight from molecular dynamics study of oxidized surfactant monolayers
Roeselová, Martina; Khabiri, Morteza; Cwiklik, Lukasz
2012 - anglický
Organic compounds are ubiquitous in atmospheric aerosols. The morphology and structure of the organic phase affect the optical properties of the aerosols, their heterogeneous reactivity as well as their ability to nucleate cloud droplets and ice particles. It is commonly assumed that atmospheric oxidative ageing of the organic material, leading to the formation of polar groups such as carbonyl (=O), hydroxyl (-OH) and carboxylic acid (-COOH), will render the aerosol particle surfaces increasingly more hydrophilic, hence, able to take up more water. Field measurements have shown that a large fraction of the organic material found in aerosols are surface active compounds, such as fatty acids and lipids(Tervahattu, 2002 and 2005). An inverted micelle structure, with an aqueous core surrounded by an organic surfactant layer, has thus been proposed for aqueous aerosols, both marine and continental (Donaldson, 2006). While recent experiments suggest the existence of more complex structures, such as organic inclusions and surfactant lenses (Dennis-Smither, 2012), a monolayer (ML) of surface active organics on an aqueous subphase (the so called Langmuir monolayers) represents the basic model system used in laboratory studies aimed at elucidating the effect of oxidative processes on structural properties of organic coatings on aerosol particles. In our previous work, we used molecular dynamics computer simulations to study the structure and stability of oxidized phospholipid MLs (Khabiri, 2012). In this contribution, we employed the molecular dynamics simulation technique to investigate – with atomistic resolution – structural changes occuring in a fatty acid ML upon moderate degree of oxidation.
Klíčová slova:
atmospheric aerosols; organic coatings; hydrophilic; hydrophobic; oxidation
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Does oxidation make the organic aerosol coatings more hydrophilic? Insight from molecular dynamics study of oxidized surfactant monolayers
Organic compounds are ubiquitous in atmospheric aerosols. The morphology and structure of the organic phase affect the optical properties of the aerosols, their heterogeneous reactivity as well as ...
Synthesis of conformationally locked carbocyclic nucleosides with norbornane as pseudosugar moiety
Dejmek, Milan; Hřebabecký, Hubert; Šála, Michal; Dračínský, Martin; Nencka, Radim
2011 - anglický
We describe the chemical synthesis of three novel structural types of conformationally locked carbocyclic nucleosides with norbornane as sugar surrogate. The presented structures bear hydroxymethyl, nucleobase or both in the bridgehead positions of the norbornane pseudosugar and thus adopt three different conformations of the cyclopentane ring – North, South, and East.
Klíčová slova:
norbornane; conformationally locked cyrbocyclic nucleosides
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Synthesis of conformationally locked carbocyclic nucleosides with norbornane as pseudosugar moiety
We describe the chemical synthesis of three novel structural types of conformationally locked carbocyclic nucleosides with norbornane as sugar surrogate. The presented structures bear hydroxymethyl, ...
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