No (5624)
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Možnosti využití sedimentů pro ochranu břehů a podporu rozvoje litorálu
Vrzák, J.; Borovec, Jakub
2022 - Czech
Porovnání různých přístupů k řešení prooblému s nadbytečným množstvím sedimentů a potřebou realizovat protiabrazní opatření ukazuje výhodnost použití upravených dnových sedimentů do ochranných konstrukcí. A comparison of different approaches to solving the problem of excess sediments and the need to implement anti-abrasion measures shows the advantage of using modified bottom sediments in protective structures.
Keywords:
sediment reuse; circular economy; nature-based designing
Available at various institutes of the ASCR
Možnosti využití sedimentů pro ochranu břehů a podporu rozvoje litorálu
Porovnání různých přístupů k řešení prooblému s nadbytečným množstvím sedimentů a potřebou realizovat protiabrazní opatření ukazuje výhodnost použití upravených dnových sedimentů do ochranných ...
Degradation of polycaprolactone electrospun materials - methods of analysis
Havlíčková, K.; Řezanka, M.; Kobera, Libor; Kuželová Košťáková, E.; Lukáš, D.; Jenčová, V.
2021 - English
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.
Keywords:
electrospinning; nanofibers; enzymatic degradation
Available at various institutes of the ASCR
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 ...
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 - English
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.
Keywords:
particulate matter emissions; gasoline; biofuels; toxicity; gene expression profiling
Available at various institutes of the ASCR
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 ...
Houby v jeskyních
Nováková, Alena
2021 - Czech
Práce zahrnuje údaje o zastoupení mikroskopických hub v různých evropských jeskyních (Česká republika, Slovensko, Rumunsko, Maďarsko, Slovinsko, Španělsko a Francie) získaný studiem v průběhu 20 let. Data about the occurrence of microscopic fungi in several European caves (Czech Republic, Slovakia, Romania, Hungary, Slovenia and Spain) obtained during 20 years studies are presented
Keywords:
Microscopic fungi; cave environment
Available at various institutes of the ASCR
Houby v jeskyních
Práce zahrnuje údaje o zastoupení mikroskopických hub v různých evropských jeskyních (Česká republika, Slovensko, Rumunsko, Maďarsko, Slovinsko, Španělsko a Francie) získaný studiem v průběhu 20 ...
Přenosný kapalinový chromatograf jako nový nástroj stanovení nebezpečných látek
Šesták, Jozef; Lunerová, K.; Vaněk, J.
2021 - Czech
Přenosný kapalinový chromatograf představuje nový přístroj kompaktních rozměrů, který umožňuje realizaci HPLC analýz v podmínkách mimo laboratoř. Byl využit pro vývoj certifikované metodiky pro detekci a stanovení vybraných mykotoxinů v komplexních vzorcích. The portable liquid chromatograph is a new instrument of compact dimensions, which enables the implementation of HPLC analyzes in conditions outside the laboratory. It was used for the development of a certified methodology for the detection and determination of selected mycotoxins in complex samples.\n\n
Keywords:
portable liquid chromatograph; mykotoxins; miniaturization
Available on request at various institutes of the ASCR
Přenosný kapalinový chromatograf jako nový nástroj stanovení nebezpečných látek
Přenosný kapalinový chromatograf představuje nový přístroj kompaktních rozměrů, který umožňuje realizaci HPLC analýz v podmínkách mimo laboratoř. Byl využit pro vývoj certifikované metodiky pro ...
EPR-elektrochemická studie redukčního mechanismu konjugátů pyrenu a cyklobutenu
Koláčná, Lucie; Polák, P.; Klíma, Jiří; Tobrman, T.; Ludvík, Jiří
2021 - Czech
Čistě organické konjugované systémy nacházejí v současné době široké uplatnění\nv materiálové chemiiý. Jsou často využívané také pro přípravu organických polovodičů, na\nkteré je zaměřen náš projekt. ´´Green smart molecules´´ jsou biodegradovatelné látky, které\nneobsahují žádné kovy. Velkou výhodou je možnost úpravy jejich vlastností změnou struktury\npomocí prosté chemické modifikace. Reduction mechanism of pyrene-cyclobutene conjugates were studied electrochemically and\nspectro-electrochemically. Analysis and interpretation of spectro-electrochemical data of\nconjugates revealed intramolecular communication of electrons and enabled determination of\nredox mechanism of conjugates. This knowledge is fundamental for tuning the required redox\nproperties of molecules just by chemical modification. Studied molecules represent promising\nmaterial for organic semiconductor materials.
Keywords:
Pyrene; Electrochemical reduction; Cyclobutene
Available on request at various institutes of the ASCR
EPR-elektrochemická studie redukčního mechanismu konjugátů pyrenu a cyklobutenu
Čistě organické konjugované systémy nacházejí v současné době široké uplatnění\nv materiálové chemiiý. Jsou často využívané také pro přípravu organických polovodičů, na\nkteré je zaměřen náš projekt. ...
Looking into the Photo-stability of Eosin by Electrochemical Methods
Sabatini, F.; Sokolová, Romana; Degano, I.
2021 - English
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.
Keywords:
Eosin; Synthetic dye; UV-Vis spectroelectrochemistry
Available on request at various institutes of the ASCR
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 ...
Oxidation Processes of N-methylguanines
Trnková, L.; Třísková, I.; Liška, Alan; Ludvík, Jiří
2021 - English
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.
Keywords:
Guanine; N-methylated guanine; Oxidation process
Available on request at various institutes of the ASCR
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 ...
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 - English
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.
Keywords:
climate change impacts; Czech agriculture; global assessment model
Available at various institutes of the ASCR
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 ...
3D printed materials for the electrochemical determination of biologically active compounds
Choińska, Marta Katarzyna; Navrátil, Tomáš; Hrdlička, Vojtěch
2021 - English
3D printing materials are relatively novel materials in electrochemistry,\nused for manufacturing of electrochemical cells, electrodes\netc. They have been widely used mainly for tailored, fast, inexpensive,\nand easy preparation of various equipment for analyses of\nbiologically active compounds. Various medicinal products and illicit\ndrugs belong to this broad group of analytes which need to be\nmonitored because of the possibility of (un)intentional overdose or\nrecreational consumption, which can cause serious side effects or\neven death. Due to this risk, we decided to focus our research on the\ndevelopment of new, sensitive, selective, and easily customizable 3D\nprinted sensors for the determination of some commonly used\nantidepressants, analgesics, and illicit drugs.
Keywords:
analgesics; antidepressants; voltammetric determination
Available on request at various institutes of the ASCR
3D printed materials for the electrochemical determination of biologically active compounds
3D printing materials are relatively novel materials in electrochemistry,\nused for manufacturing of electrochemical cells, electrodes\netc. They have been widely used mainly for tailored, fast, ...
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