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Wyświetlanie 1-15 z 88
Tytuł:
Action mechanisms of antioxidant and prooxidants properties of flavonoids as model for understanding the oxygen metabolism
Autorzy:
Espindola, C.
Powiązania:
https://bibliotekanauki.pl/articles/81104.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
conference
redox potential
flavonoids
free radical
antioxidant
prooxidant
oxygen metabolism
lipid peroxidation
hydrophobicity
Źródło:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2013, 94, 2
0860-7796
Pojawia się w:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of multiple-area renewable integrated hydro-thermal system considering artificial rabbit optimized PI (FOPD) cascade controller and redox flow battery
Autorzy:
Saha, Arindita
Chiranjeevi, Tirumalasetty
Devarapalli, Ramesh
Babu, Naladi Ram
Dash, Puja
Garcìa Màrquez, Fausto Pedro
Powiązania:
https://bibliotekanauki.pl/articles/27324511.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
solar thermal
automatic generation control
geothermal
artificial rabbit optimization
redox flow battery
PI(FOPD) controller
Opis:
The current task explores automatic generation control knowledge under old-style circumstances for a triple-arena scheme. Sources in area-1 are thermal-solar thermal (ST); thermalgeothermal power plant (GPP) in area-2 and thermal-hydro in area-3. An original endeavour has been set out to execute a new performance index named hybrid peak area integral squared error (HPA-ISE) and two-stage controller with amalgamation of proportional-integral and fractional order proportional-derivative, hence named as PI(FOPD). The performance of PI(FOPD) has been compared with varied controllers like proportional-integral (PI), proportional-integralderivative (PID). Various investigation express excellency of PI(FOPD) controller over other controller from outlook regarding lessened level of peak anomalies and time duration for settling. Thus, PI(FOPD) controller’s excellent performance is stated when comparison is undergone for a three-area basic thermal system. The above said controller’s gains and related parameters are developed by the aid of Artificial Rabbit Optimization (ARO). Also, studies with HPA-ISE enhances system dynamics over ISE. Moreover, a study on various area capacity ratios (ACR) suggests that high ACR shows better dynamics. The basic thermal system is united with renewable sources ST in area-1 also GPP in area-2. Also, hydro unit is installed in area-3. The performance of this new combination of system is compared with the basic thermal system using PI(FOPD) controller. It is detected that dynamic presentation of new system is improved. Action in existence of redox flow battery is also examined which provides with noteworthy outcome. PI(FOPD) parameters values at nominal condition are appropriate for higher value of disturbance without need for optimization.
Źródło:
Archives of Control Sciences; 2023, 33, 4; 861--884
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Badania nad wpływem różnych związków chloru czynnego na przeżywalność jaj Ascaris w zależnosci od pH i potencjału oksydacyjno-redukcyjnego
Issledowanie vlijanija razlichnykh soedinenijj aktivnogo khlora na zhiznesposobnost jaic Ascaris v zavisimosti ot pH i ot redokcipotenciala
Results of the research concerning the influence of various compounds of available chlorine on the survival of the eggs of Ascaris in relation to pH and the oxidation-reduction potential (ORP)
Autorzy:
Iwanczuk, I.
Dozanska, W.
Powiązania:
https://bibliotekanauki.pl/articles/872374.pdf
Data publikacji:
1959
Wydawca:
Narodowy Instytut Zdrowia Publicznego. Państwowy Zakład Higieny
Tematy:
scieki
osady sciekowe
Ascaris
jaja
unieszkodliwianie
niszczenie jaj
chlorowanie
przezywalnosc
potencjal oksydo-redukcyjny
pH
waste water
sewage sludge
egg
waste treatment
destruction
chlorination
survival
redox potential
Źródło:
Roczniki Państwowego Zakładu Higieny; 1959, 10, 6
0035-7715
Pojawia się w:
Roczniki Państwowego Zakładu Higieny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Badania potencjału redoks na przykładzie sudeckich wód leczniczych
Research of redox potential on the example of curativewaters in the Sudetes Mts., Poland
Autorzy:
Dobrzyński, D.
Powiązania:
https://bibliotekanauki.pl/articles/2074741.pdf
Data publikacji:
2010
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
chemizm wód podziemnych
ptencjał redoks
wody lecznicze
Sudety
groundwater chemistry
redox potential
curative water
Sudetes
Opis:
In Poland, the redox potential (EH) is seldomly measured in groundwater. Since the year 2006 determination of redox potential is required for documenting properties of curative mineral waters. Investigations of redox conditions in groundwater need both proper measurement and interpretation. In the paper, crucial questions of: 1) redox equilibrium in groundwater, 2) field measurement, 3) correction methods, and 4) EH interpretation are presented. Some aspects of applying the redox potential for interpreting groundwater chemistry and using geochemical modelling are illustrated by hydrochemical data of curative waters from spas in the Sudetes Mts., SW Poland. Main reasons of the common redox non-equilibrium found in groundwater are co-existence of numerous aqueous redox pairs and usually non-equilibrium in particular redox pairs. Redox determinations have to be done in the field, and require extreme cleanness and precision, e.g., measuring without contact with the atmospheric air. Field measurements must be corrected to the standard hydrogen electrode, considering: type of reference electrode, concentration of electrode filling solution, type of standard redox solution, and water temperature. The redox potential has been measured in water at first from all the Sudetic spas, totally in 33 water intakes. In curative waters from the Sudetes corrected EH ranges between –159 mV and +343 mV. Usually, thermal waters show lower EH values than cold, CO2-rich waters. The lowest redox potential was found in the hottest thermal waters, i.e., in water from Zdzisław intake (in Lądek Zdrój) and C-2 intake (in Cieplice Śląskie Zdrój). Generally, the higher the pH, the lower the EH in groundwater. Methods of geochemical modelling, which are often and often applied in groundwater research, also require the EH determination. Information about EH are used in the calculation of speciation models of water, and affect the results of whole geochemical modelling as well as evaluations of the saturation state. The speciation-solubility modelling for the Sudetic curative waters, presented in the paper, shows that the proper correction of field EH measurement determines the quality of calculations. Improperly corrected EH values might lead to species activity errors, even up to several order of magnitudes, and erroneous interpretation of the mineral phases stability in the hydrogeochemical system.
Źródło:
Przegląd Geologiczny; 2010, 58, 1; 46-53
0033-2151
Pojawia się w:
Przegląd Geologiczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cellular light memory, photo-electrochemical and redox retrograde signaling in plants
Autorzy:
Karpinski, S.
Szechynska-Hebda, M.
Powiązania:
https://bibliotekanauki.pl/articles/80291.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
cellular light memory
photoelectric signal
redox retrograde signalling
plant
non-photochemical quenching
photosynthetic electron transport
reactive oxygen species
environmental stress
dynamic change
light intensity
light quality
light energy
chlorophyll fluorescence
Źródło:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2012, 93, 1
0860-7796
Pojawia się w:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Changes of peroxiredoxins in beech seeds (Fagus sylvatica L.) during development and maturation
Autorzy:
Ratajczak, E.
Kalemba, E.M.
Pukacka, S.
Powiązania:
https://bibliotekanauki.pl/articles/79952.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
conference
peroxiredoxin
beech seed
Fagus sylvatica
hydrogen peroxide
reactive nitrogen species
redox signal
plant development
maturation
immunoblot
Źródło:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2013, 94, 3
0860-7796
Pojawia się w:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characterisctics of aeration properties of Orthic Luvisol from Poland under different land use
Autorzy:
Stepniewski, W.
Stepniewska, Z.
Przywara, G.
Brzezinska, M.
Wlodarczyk, T.
Powiązania:
https://bibliotekanauki.pl/articles/24066.pdf
Data publikacji:
2000
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
catalase activity
soil aeration
Polska
aeration
oxygen diffusion rate
oxygen diffusion coefficient
gas diffusion coefficient
redox potential
dehydrogenase activity
aeration parameter
soil moisture
Źródło:
International Agrophysics; 2000, 14, 4
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Chemical Reduction of Gold(III) Bromide Complexes Using Sodium Nitrite - Kinetic Aspects
Autorzy:
Pacławski, K.
Powiązania:
https://bibliotekanauki.pl/articles/354755.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
kinetics
mechanism
redox
gold complexes
sodium nitrite
Opis:
In this work, the spectrophotometric studies on the kinetics of redox reaction between gold(III) bromide complexes and sodium nitrite, were carried out. From the kinetic curves collected under different conditions of reactants concentration, addition of bromide ions, temperature, pH and ionic strength, corresponding rate constants have been determined. The obtained results suggest the complex path of the [AuBr4]- reduction consisting of two parallel, bimolecular reactions where different reductant species (HNO2 and NO2-) take place and consecutive step with the metallic gold production. The second-order rate constants at 20°C are equal to 2.948 and 0.191 M-1·s-1, respectively. The values of activation enthalpy and activation entropy for the first and the second parallel step of the reaction were found to be ΔH‡ = 29.18 kJ·mol-1 and ΔS‡ = –13.95 J·mol-1·K, and ΔH‡ = 40.75 kJ·mol-1 and ΔS‡ = –31.06 J·mol-1·K, respectively. It was found that the reaction accelerates significantly with the increase of pH and is inhibited with the increase of Br- concentration. The substitutive, inner-sphere mechanism of electron transfer in the studied system was also suggested.
Źródło:
Archives of Metallurgy and Materials; 2020, 65, 2; 667-675
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Chromium and its forms in soils in the proximity of the old tannery waste lagoon
Autorzy:
Stepniewska, Z.
Bucior, K.
De Boodt, M.
Powiązania:
https://bibliotekanauki.pl/articles/26530.pdf
Data publikacji:
2001
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
chromium
natural environment
soil
atmosphere
tannery waste
water
redox potential
hazard
pH condition
heavy metal
Źródło:
International Agrophysics; 2001, 15, 2
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Constraints of the MAX4781 CMOS Solution for Electrode Switching in Multilayer Electrochemical Probes
Autorzy:
Cimpoiasu, V.M.
Radulescu, F.
Nealson, K.H.
Moga, Ioana Corina
Popa, R.
Powiązania:
https://bibliotekanauki.pl/articles/2106598.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
sensor
SPEAR
multielectrode
redox interface
sediments
electrochemical gradients
Opis:
The most common means to analyze redox gradients in sediments is by push/pulling electrochemical probes through sediment’ strata while repeating measurements. Yet, as electrodes move up and down they disrupt the texture of the sediment layers thus biasing subsequent measurements. This makes it difficult to obtain reproducible measurements or to study the evolution of electrochemical gradients. One solution for solving this problem is to eliminate actuators and electrode movements altogether, while instead deploying probes with numerous electrodes positioned at various depths in the sediment. This mode of operation requires electrode switching. We discuss an electrode-switching solution for multi-electrode probes, based on Complementary Metal-Oxide-Semiconductor (CMOS) multiplexors. In this solution, electrodes can be individually activated in any order, sequence or time frame through digital software commands. We discuss constraints of CMOS-based multilayer electrochemical probes during cyclic voltammetry.
Źródło:
Archives of Metallurgy and Materials; 2022, 67, 2; 691--694
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dehydrogenase and catalase activity in Eutric Histosol as affected by soil temperature and water content
Autorzy:
Brzezinska, M
Stepniewska, Z.
Stepniewski, W.
Pasztelan, M.
Powiązania:
https://bibliotekanauki.pl/articles/1401863.pdf
Data publikacji:
2000
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
catalase activity
soil water
Eutric Histosol
redox potential
soil temperature
dehydrogenase activity
soil enzyme
water content
Opis:
Soil enzyme activity indicates potential of the soil to sustain biochemical processes, which are essential for the maintenance of soil fertility. Dehydrogenase activity reflects total oxidative activity of soil microflora, catalase activity is responsible for the decomposition of H2O2. Redox potential (Eh) is an index of the soil aeration status. Effects of soil temperature and water content on Eh, soil dehydrogenase activity and catalasc activity in an Eutric Histosol at three different fields planted with Papulus nigra, Salix amencana, and grasses (with Alopecurits pratensis, Phalaris arundinacea, Festuca pratensis is as dominating species) were studied at the depths of 10, 30, 50, 70 cm. Enzyme activity and redox potential showed seasonal fluctuations following natural changes of soil water content and temperature. Dehydrogenase activity was significantly correlated with soil temperature and water content (r=0.37** and r=0.27***, respectively). Redox potential showed a significant correlation with soil water content (r=-0.32*** ). Catalase activity did not exhibit any correlation with the tested parameters. The type of plantation influenced enzyme activities; tree cover was characterised by higher dehydrogenase and catalase activities than meadow soils.
Źródło:
Acta Agrophysica; 2000, 35; 31-40
1234-4125
Pojawia się w:
Acta Agrophysica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Denitrification, organic matter and redox potential transformations in Cambisols
Autorzy:
Wlodarczyk, T.
Stepniewska, Z.
Brzezinska, M.
Powiązania:
https://bibliotekanauki.pl/articles/24127.pdf
Data publikacji:
2003
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
clay
silt
organic matter
greenhouse gas
Polska
sand
denitrification
loess
soil respiration
flood condition
redox potential
Źródło:
International Agrophysics; 2003, 17, 4
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Developmental changes in the levels and redox potentials of main hemolymph thiols/disulfides in the Jamaican field cricket Gryllus assimilis
Autorzy:
Sadowska-Bartosz, Izabela
Furmaniak, Paulina
Bieszczad-Bedrejczuk, Edyta
Bartosz, Grzegorz
Głowacki, Rafał
Powiązania:
https://bibliotekanauki.pl/articles/1038598.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
insect
Gryllus assimilis
hemolymph
glutathione
cysteine
homocysteine
redox potential
redox environment
Opis:
Main thiols and disulfides were determined in the hemolymph of the Jamaican field cricket Gryllus assimilis at various developmental stages. On the basis of these data, redox potentials of the glutathione, cysteine and homocysteine redox systems were calculated. The concentrations of all thiols studied decreased during development (at a stage of 6 molts) with respect to young crickets, and increased again in adult insects. Redox potentials of the glutathione and cysteine systems increased from values of -131.0±5.6 mV and -86.9±17.1 mV, respectively in young crickets to -58.0±3.6 mV and -36.1±4.2 mV, respectively, at the stage of 6 molts and decreased to values of -110.4±24.8 mV and -66.3±12.2 mV, respectively, in adult insects. Redox potentials of the glutathione and cysteine systems in the hemolymph of young and adult insects were similar to those reported for human plasma.
Źródło:
Acta Biochimica Polonica; 2017, 64, 3; 503-506
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dobry amyloid β? Właściwości chemiczne peptydów Aβ4-x wskazują na ich znaczenie biologiczne
Good β-amyloid? Chemical properties of Aβ4-x peptides indicate their biological relevance
Autorzy:
Bal, Wojciech
Powiązania:
https://bibliotekanauki.pl/articles/172163.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Chemiczne
Tematy:
peptydy β-amyloidowe
choroba Alzheimera
ATCUN/NTS
wiązanie Cu(II)
aktywność redoks
amyloid β peptides
Alzheimer’s disease
Cu(II) binding
redox reactivity
Opis:
Alzheimer’s Disease is a neurodegenerative condition, an irreversible progressive dementia caused by death of neurons in brain structures responsible for memory related processes. Despite many years of research and numerous trials, no therapy succeeded that could stop the development of this disease, which affects tens of millions of patients worldwide. The amyloid cascade prevails among a variety of possible mechanisms of its development proposed in the scientific literature. It proposes that death of neurons, preceded by dysfunction of their synaptic activity is caused by the incremental formation of structures (fibrils, oligomers) composed of Aβ peptides. In its copper variant the processes of aggregation and oxidative stress, causing the inflammation and neuronal damage are related to the formation of reactive Cu(II) complexes with Aβ peptides. Aβ peptides are a family of molecules with similar amino acid sequences, differing mainly by the presence of longer or shorter terminal sequences. Their physiological role of is unclear. Aβ1-42 and Aβ1-40 have been mostly studied, but most studies have ignored a very abundant N-terminally truncated species Aβ4-42. We recognized it, and more gene-rally the Aβ4-x peptide family as potentially strong Cu(II) ligands, due to the presence at their N-termini of the Phe-Arg-His amino acid sequence, comprising the ATCUN/NTS structural motif. This observation was followed by vigorous research performed in our laboratory. We studied the ability of Aβ4-x peptides to bind Cu(II) ions, their electrochemical properties and redox reactivity, interactions with proteins which bind copper under physiological conditions, their aggregation properties in the Cu(II) presence and susceptibility to proteolysis. Additionally, we investigated their interaction with a molecule of a therapeutic potential. We demonstrated that Aβ4-x peptides can be primary copper bin-ding agents in extracellular spaces in the brain, able to instantaneously intercept copper from Aβ1-x peptides studied so far. Cu(II) complexes of Aβ4-x peptides are highly resistant to oxidation and reduction, release copper ions to other molecules slowly and reluctantly, and do not produce reactive oxygen species. In accordance with these properties we proposed a physiological role for the Aβ4-42 peptide as a molecule cleansing the synaptic cleft from Cu2+ ions and thereby assuring the correct neurotransmission. This function can however be disturbed by an inappropriate pharmacological intervention. The results of studies of the effect of cupric ions on the aggregation and membrane interactions of the Aβ4-40 peptides suggest that copper can inhibit the Aβ4-x peptides toxicity, thereby providing an additional support for our concept. Studies of hydrolysis of Aβ peptides and properties of its products revealed a possibility for a significant role of short fragments in the brain copper physiology. Our hypothesis awaits verification by biological studies. The issue of metabolism of the studied complexes is a key issue remaining to be solved.
Źródło:
Wiadomości Chemiczne; 2019, 73, 5-6; 351-366
0043-5104
2300-0295
Pojawia się w:
Wiadomości Chemiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
DYn-2 is an excellent chemical reporter for the Arabidopsis sulfenome
Autorzy:
Akter, M.
Wahni, K.
Martinez-Acedo, P.
Carroll, K.
van Breusegem, F.
Messens, J.
Powiązania:
https://bibliotekanauki.pl/articles/80760.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
conference
oxidative stress
redox signal
Arabidopsis thaliana
DYn-2 reporter
purification
sulphenome
stress tolerance
Źródło:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2013, 94, 2
0860-7796
Pojawia się w:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 88

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