Curcumin oligomers and their stability in the gas phase investigated by electrospray ionization mass spectrometry
Jaklová Dytrtová, Jana; Jakl, Michal; Jakl, M.
2022 - anglický Klíčová slova: curcumin; electrospray ionization; mass spectrometry. Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR. Curcumin oligomers and their stability in the gas phase investigated by electrospray ionization mass spectrometry

Jaklová Dytrtová, Jana; Jakl, Michal; Jakl, M.
Ústav organické chemie a biochemie, 2022

Characterization of Ca2+ binding properties of human ameloblastin I and II isoforms and ameloblastin C-term proteins by capillary electrophoresis
Sázelová, Petra; Vetýšková, Veronika; Boušová, Kristýna; Vondrášek, Jiří; Kašička, Václav
2022 - anglický Klíčová slova: calcium ion; capillary electrophoresis; human ameloblastin Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR. Characterization of Ca2+ binding properties of human ameloblastin I and II isoforms and ameloblastin C-term proteins by capillary electrophoresis

Sázelová, Petra; Vetýšková, Veronika; Boušová, Kristýna; Vondrášek, Jiří; Kašička, Václav
Ústav organické chemie a biochemie, 2022

Study of complexation of 5-phenylazopyrimidines with β-cyclodextrin by affinity capillary electrophoresis
Štěpánová, Sille; Procházková, Eliška; Hruzíková, Anna; Čechová, Lucie; Janeba, Zlatko; Kašička, Václav
2022 - anglický Klíčová slova: affinity capillary electrophoresis; β-cyclodextrin; 5-phenylazopyrimidines Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR. Study of complexation of 5-phenylazopyrimidines with β-cyclodextrin by affinity capillary electrophoresis

Štěpánová, Sille; Procházková, Eliška; Hruzíková, Anna; Čechová, Lucie; Janeba, Zlatko; Kašička, Václav
Ústav organické chemie a biochemie, 2022

Mercury Film Screen-Printed Electrodes
Josypčuk, Bohdan; Šestáková, Ivana; Tvorynska, Sofiia
2022 - anglický Mercury film screen-printed electrodes (MF-SPEs) were designed, prepared and tested for the first time as perspective representatives among SPEs that allow measuring at high negative potentials. For this purpose, the precise electrochemical (coulometric) preparation procedure for mercury deposition at the working electrode surface of the commercial silver-SPE was developed and a universal method of preparing MF-electrodes from different metal-SPEs was described. An optimal electrolyzer construction for the mercury deposition, electrolyte composition, electrolysis potential, and an activation of electrode surfaces were proposed. Determination of the zinc content in food supplement tablets was used for the MF-SPEs practical testing. Klíčová slova: flow analysis; mercury film; screen-printed electrodes; electrochemistry Plné texty jsou dostupné na vyžádání prostřednictvím repozitáře Akademie věd. Mercury Film Screen-Printed Electrodes

Mercury film screen-printed electrodes (MF-SPEs) were designed, prepared and tested for the first time as perspective representatives among SPEs that allow measuring at high negative potentials. For ...

Josypčuk, Bohdan; Šestáková, Ivana; Tvorynska, Sofiia
Ústav fyzikální chemie J. Heyrovského, 2022

Spectroelectrochemistry of 1,10-phenantrolines Substituted by Pyrrolidine and Phenothiazine Redox-active Units
Sokolová, Romana; Wantulok, J.; Fiedler, Jan; Nycz, J.; Degano, I.
2022 - anglický Compounds based on 1,10-phenanthroline (Phen) and their complexes are used in many fields, such as a stabilizing agent in the synthesis of nanoparticles, catalysts in homogeneous catalysis and as a semiconductor in organic light-emitting diodes (OLED) due to their coordination abilities. In this work, 1,10-phenanthrolines functionalized by pyrrolidine and phenothiazine units were studied by electrochemical methods. Cyclic voltammetry resulted in several oxidation and reduction voltammetric peaks. Structure-activity relationship was investigated using in situ spectroeletrochemistry, spectrophotometry, infrared spectroscopy and chromatography. Klíčová slova: 1,10-phenanthroline; Electrochemistry; Oxidation mechanism; Reduction mechanism Plné texty jsou dostupné na vyžádání prostřednictvím repozitáře Akademie věd. Spectroelectrochemistry of 1,10-phenantrolines Substituted by Pyrrolidine and Phenothiazine Redox-active Units

Compounds based on 1,10-phenanthroline (Phen) and their complexes are used in many fields, such as a stabilizing agent in the synthesis of nanoparticles, catalysts in homogeneous catalysis and as a ...

Sokolová, Romana; Wantulok, J.; Fiedler, Jan; Nycz, J.; Degano, I.
Ústav fyzikální chemie J. Heyrovského, 2022

Degradation of polycaprolactone electrospun materials - methods of analysis
Havlíčková, K.; Řezanka, M.; Kobera, Libor; Kuželová Košťáková, E.; Lukáš, D.; Jenčová, V.
2021 - anglický Biodegradable electrospun materials are widely used for medical application. Polycaprolatone is polymer suitable for electrospinning technology and is very often used to create nanofibrous scaffolds for tissue engineering. The time to disintegration or biodegradation of such materials is very important here. However, testing is not entirely easy. It is not possible to create exactly body-like conditions in vitro. Moreover, it is not easy to find suitable analytical methods that would show exactly what happens in the nanofibrous polycaprolactone electrospun samples at certain stages of degradation, ie how the internal structure of decaying nanofibers changes. This paper describes the traditional use of methods for testing polycaprolatone nanofibers by enzymatically catalysed degradation. Morphological changes are studied using scanning electron microscope images. However, it also offers a non-traditional analysis of polycaprolactone electrospun materials using the ssNMR method. Klíčová slova: electrospinning; nanofibers; enzymatic degradation Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR. Degradation of polycaprolactone electrospun materials - methods of analysis

Biodegradable electrospun materials are widely used for medical application. Polycaprolatone is polymer suitable for electrospinning technology and is very often used to create nanofibrous scaffolds ...

Havlíčková, K.; Řezanka, M.; Kobera, Libor; Kuželová Košťáková, E.; Lukáš, D.; Jenčová, V.
Ústav makromolekulární chemie, 2021

Toxic responses in human lung epithelial cells (BEAS-2B) exposed to particulate matter exhaust emissions from gasoline and biogasoline
Závodná, Táňa; Líbalová, Helena; Vrbová, Kristýna; Sikorová, Jitka; Vojtíšek-Lom, M.; Beránek, V.; Pechout, M.; Kléma, J.; Cigánek, M.; Machala, M.; Neča, J.; Rössner ml., Pavel; Topinka, Jan
2021 - anglický Motor vehicle emissions substantially contribute to air pollution worldwide and cause serious health problems. While the deleterious effects of diesel exhaust particulate matter (PM) have been widely studied, much less attention is paid to toxicity of PM emitted by gasoline engines although they also produce considerable amount of PM. The primary objective of this research was to assess toxic potencies of exhaust PM released by conventional gasoline engine fueled with neat gasoline (EU) or gasoline-ethanol blend (15% ethanol, v/v, E15). Despite a similar particle mass (mu g PM/kg fuel) produced by both fuels, PM emitted by E15 contained higher amount of harmful polycyclic aromatic hydrocarbons (PAH) as suggested by chemical analysis. To examine the toxicity of organic PM constituents, human lung BEAS-2B cells were exposed for 4h and 24h to a subtoxic dose of E0 and E15 PM organic extracts. We used genome scale transcriptomic analysis to characterize the toxic response and to identify modulated biological process and pathways. Whereas 4h exposure to both PM extracts resulted in modulation of similar genes and pathways related to lipid and steroid metabolism, activation of PPAR alpha, oxidative stress and immune response, 24h exposure was more specific for each extract, although both induced expression of PAH-metabolic enzymes, modulated metabolism of lipids or activated PPAR alpha, E15 additionally deregulated variety of other pathways. Overall, the PM mass produced by both fuels was similar, however, higher PAH content in E15 PM organic extract may have contributed to more extensive toxic response particularly after 24h exposure in BEAS-2B cells. Klíčová slova: particulate matter emissions; gasoline; biofuels; toxicity; gene expression profiling Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR. Toxic responses in human lung epithelial cells (BEAS-2B) exposed to particulate matter exhaust emissions from gasoline and biogasoline

Motor vehicle emissions substantially contribute to air pollution worldwide and cause serious health problems. While the deleterious effects of diesel exhaust particulate matter (PM) have been widely ...

Závodná, Táňa; Líbalová, Helena; Vrbová, Kristýna; Sikorová, Jitka; Vojtíšek-Lom, M.; Beránek, V.; Pechout, M.; Kléma, J.; Cigánek, M.; Machala, M.; Neča, J.; Rössner ml., Pavel; Topinka, Jan
Ústav experimentální medicíny, 2021

Looking into the Photo-stability of Eosin by Electrochemical Methods
Sabatini, F.; Sokolová, Romana; Degano, I.
2021 - anglický Eosin Y is a synthetic organic dye belonging to the xanthene family. Its bright and fluorescent\npink hue attracted and intrigued the painters of the 19th century, who experimented eosin as\npigment lake (often called Geranium lake) in their paintings. Nevertheless, eosin coloration is\nas beautiful as unstable, and examples of work of arts with faded hues have been documented.\nEosin is not only photo-sensitive but also pH sensitive, making its study very complex. In this\nwork, the combination of electrochemical and spectroscopic techniques revealed to be effective\nfor correlating the physical evidence of eosin fading with its chemical degradation. Klíčová slova: Eosin; Synthetic dye; UV-Vis spectroelectrochemistry Plné texty jsou dostupné na vyžádání prostřednictvím repozitáře Akademie věd. Looking into the Photo-stability of Eosin by Electrochemical Methods

Eosin Y is a synthetic organic dye belonging to the xanthene family. Its bright and fluorescent\npink hue attracted and intrigued the painters of the 19th century, who experimented eosin as\npigment ...

Sabatini, F.; Sokolová, Romana; Degano, I.
Ústav fyzikální chemie J. Heyrovského, 2021

Oxidation Processes of N-methylguanines
Trnková, L.; Třísková, I.; Liška, Alan; Ludvík, Jiří
2021 - anglický The oxidation processes of N-methylguanines were investigated in both experimental and\ntheoretical way. Voltammetric oxidation potentials of guanine and its methyl analogues,\nacquired on polymer pencil graphite electrode (pPeGE), were compared with the HOMO\n(SOMO) energies calculated by density functional (DFT) methods. Our study contributes to\nunderstanding not only the oxidation processes of methylated guanines but also their role in\nepigenetics. Klíčová slova: Guanine; N-methylated guanine; Oxidation process Plné texty jsou dostupné na vyžádání prostřednictvím repozitáře Akademie věd. Oxidation Processes of N-methylguanines

The oxidation processes of N-methylguanines were investigated in both experimental and\ntheoretical way. Voltammetric oxidation potentials of guanine and its methyl analogues,\nacquired on polymer ...

Trnková, L.; Třísková, I.; Liška, Alan; Ludvík, Jiří
Ústav fyzikální chemie J. Heyrovského, 2021

Integrated national-scale assessment of climate change impacts on agriculture: the case of the Czech Republic
Arbelaez Gaviria, Juliana; Boere, E.; Havlík, P.; Trnka, Miroslav
2021 - anglický In recent years, investigating climate change impacts in the agricultural sector at the national level has become a priority for adaptation decision-making. Most of these studies quantify the impacts\nof biophysical effects and often ignore the cross-sectoral interactions and economic effects on relative competitiveness, international trade, global food supply, and food prices for the Czech Republic. Ignoring future productivity changes globally under climate change scenarios can underestimate or overestimate climate change impacts at the national level. Here, we use GLOBIOM-CZE, a global economic model, as part of a climate change impact assessment framework to evaluate the impacts on the Czech agricultural sector in terms of environmental and economic indicators. By comparing with the baseline, the ensemble of scenarios suggests a decrease in crop area and production while increasing grassland, positively affecting livestock production by mid-century. Corn and barley show the most adverse response in production and area, while rapeseed increases under scenario RCP 8.5 with CO2 fertilization effect. Livestock products production is projected to increase, especially bovine meat and milk, as within RCP 8.5, no constraints are placed on growing greenhouse gas emissions. Klíčová slova: climate change impacts; Czech agriculture; global assessment model Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR. Integrated national-scale assessment of climate change impacts on agriculture: the case of the Czech Republic

In recent years, investigating climate change impacts in the agricultural sector at the national level has become a priority for adaptation decision-making. Most of these studies quantify the ...

Arbelaez Gaviria, Juliana; Boere, E.; Havlík, P.; Trnka, Miroslav
Ústav výzkumu globální změny , 2021