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Wyświetlanie 1-15 z 19
Tytuł:
Single-electron transport characteristics in quantum dot arrays due to ionized dopants
Autorzy:
Moraru, D.
Ligowski, M.
Tarido, J. C.
Miki, S.
Nakamura, R.
Yokoi, K.
Mizuno, T.
Tabe, M.
Powiązania:
https://bibliotekanauki.pl/articles/384277.pdf
Data publikacji:
2009
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:
single dopant
silicon nanowire
single-electron transport
single-electron transfer
Opis:
Single charge manipulation for useful electronic functionalities has become an exciting and fast-paced direction of research in recent years. In structures with dimensions below about 100 nm, the physics governing the device operation turn out to be strikingly different than in the case of larger devices. The presence of even a single charge may completely suppress current flow due to the basic electronelectron repulsion (so called Coulomb blockade effect) [1]. It is even more exciting to control this effect at the level of single-electron/single-atom interaction. The atomic entity can be one donor present in silicon lattice with a Coulombic potential well. In principle, it can accommodate basically a single electron. We study the electrical behavior of nanoscale-channel silicon-on-insulator field-effect transistors (SOI-FETs) that contain a discrete arrangement of donors. The donors can be utilized as "stepping stones" for the transfer of single charges. This ability opens the doors to a rich world of applications based on the simple interplay of single charges and single atoms, while still utilizing mostly conventional and well established fabrication techniques. In this work, we distinguish the effects of single-electron transport mediated by one or few dopants only. Furthermore, we show how the single-electron/single-donor interaction can be tuned by using the external biases. We demonstrate then by simulation and experiment the feasibility of single-electron/bit transfer operation (single-electron turnstile).
Źródło:
Journal of Automation Mobile Robotics and Intelligent Systems; 2009, 3, 4; 52-54
1897-8649
2080-2145
Pojawia się w:
Journal of Automation Mobile Robotics and Intelligent Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Two-electron reduction of quinones by Enterobacter cloacae PB2 pentaerythritol tetranitrate reductase: quantitative structure-activity relationships
Autorzy:
Misevičienė, Lina
Anusevičius, Žilvinas
Šarlauskas, Jonas
Harris, Richard
Scrutton, Nigel
Čėnas, Narimantas
Powiązania:
https://bibliotekanauki.pl/articles/1041091.pdf
Data publikacji:
2007
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
pentaerythritol tetranitrate reductase
reduction mechanism
electron-transfer
quinones
Opis:
In order to clarify the poorly understood mechanisms of two-electron reduction of quinones by flavoenzymes, we examined the quinone reductase reactions of a member of a structurally distinct old yellow enzyme family, Enterobacter cloacae PB2 pentaerythritol tetranitrate reductase (PETNR). PETNR catalyzes two-electron reduction of quinones according to a 'ping-pong' scheme. A multiparameter analysis shows that the reactivity of quinones increases with an increase in their single-electron reduction potential and pKa of their semiquinones (a three-step (e-,H+,e-) hydride transfer scheme), or with an increase in their hydride-transfer potential (E7(H-)) (a single-step (H-) hydride transfer scheme), and decreases with a decrease in their van der Waals volume. However, the pH-dependence of PETNR reactivity is more consistent with a single-step hydride transfer. A comparison of X-ray data of PETNR, mammalian NAD(P)H : quinone oxidoreductase (NQO1), and Enterobacter cloacae nitroreductase, which reduce quinones in a two-electron way, and their reactivity revealed that PETNR is much less reactive, and much less sensitive to the quinone substrate steric effects than NQO1. This may be attributed to the lack of π-π stacking between quinone and the displaced aromatic amino acid in the active center, e.g., with Phe-178' in NQO1.
Źródło:
Acta Biochimica Polonica; 2007, 54, 2; 379-385
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of excitation migration on the decay of excited states via electron transfer to acceptors
Autorzy:
Gutman, M.
Hilczer, M.
Tachiya, M.
Powiązania:
https://bibliotekanauki.pl/articles/147856.pdf
Data publikacji:
2005
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
electron transfer
energy migration
simulation
fluorescence decay
polymer matrix
Opis:
Simulation of fluorescence quenching due to electron transfer from a photoexcited donor to an acceptor, in a rigid matrix has been performed. The model assumes competition between processes of the electron transfer and the resonant excitation energy transfer among donors. Electron and energy transfers are described in terms of the Marcus and the Förster theories, respectively. Dependence of the fluorescence quenching on the donor concentration and on the parameters of the Marcus and Förster equations has been investigated at a fixed acceptor concentration. Fluorescence decay curves calculated for various concentrations of donors have been compared with experimental decays.
Źródło:
Nukleonika; 2005, 50,suppl.2; 39-43
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Detection of individual dopants in singe-electron devices - a study by KFM observation and simulation
Autorzy:
Ligowski, M.
Moraru, D.
Miftahul, A.
Tarido, J. C.
Mizuno, T.
Tabe, M.
Jabłoński, R.
Powiązania:
https://bibliotekanauki.pl/articles/385159.pdf
Data publikacji:
2009
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:
single dopant
Kelvin Probe Force Microscope
single-electron transfer
Opis:
Single electron devices (SEDs) are candidates to become a keystone of future electronics. They are very attractive due to low power consumption, small size or high operating speed. It is even possible to assure compatibility with present CMOS technology when natural potential fluctuations introduced by dopant atoms are used to create quantum dots (QD). However, the main problem of this approach is due to the randomness of dopant distribution which is characteristic for conventional doping techniques. This leads to scattered characteristics of the devices, which precludes from using them in the circuits. In these work we approach the problem of correlating the distribution of QD's with the device characteristics. For that, we investigate with a Kelvin probe force microscope (KFM) the surface potential of Si nanodevice channel in order to understand the potential landscape. Results reveal the features ascribable to individual dopants. These findings are supported also by simulation results.
Źródło:
Journal of Automation Mobile Robotics and Intelligent Systems; 2009, 3, 4; 130-133
1897-8649
2080-2145
Pojawia się w:
Journal of Automation Mobile Robotics and Intelligent Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Static quenching of ruthenium(II)-polypyridyl complexes by gallic acid and quercetin in aqueous and micellar media
Autorzy:
Sheeba, D
Gnana Raj, G. A.
Powiązania:
https://bibliotekanauki.pl/articles/412659.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Ru(II)-polypyridyl complex
electron transfer
quenching
association constant
Opis:
The reactions of gallic acid and quercetin with the excited state Ru(II) complexes proceed through photoinduced electron transfer reaction in sodium dodecyl sulfate (SDS) and aqueous media at pH 11 and has been studied by luminescence quenching technique. The static nature of quenching is confirmed from the ground state absorption studies in both the media. The observed quenching rate constant (kq) values are sensitive to the nature of the ligand, medium and the structure of the quenchers. The electrostatic interaction of the cationic complexes with the anionic micelle reduces the kq values in SDS compared to that in aqueous medium.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 13, 1; 21-31
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Two-electron reduction of nitroaromatic compounds by Enterobacter cloacae NAD(P)H nitroreductase: Description of quantitative structure-activity relationships.
Autorzy:
Nivinskas, Henrikas
Koder, Ronald
Anusevièius, Žilvinas
Šarlauskas, Jonas
Miller, Anne-Frances
Čenas, Narimantas
Powiązania:
https://bibliotekanauki.pl/articles/1044214.pdf
Data publikacji:
2000
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
HMX
nitroreductase
explosive
TNT
electron transfer
tetryl
RDX
pentryl
Opis:
Enterobacter cloacae NAD(P)H:nitroreductase catalyzes the reduction of a series of nitroaromatic compounds with steady-state bimolecular rate constants (kcat/Km) ranging from 104 M-1s-1 to 107 M-1s-1 , and oxidizing 2 moles NADH per mole mononitrocompound. Oxidation of excess NADH by polynitrobenzenes including explosives 2,4,6-trinitrotoluene (TNT) and 2,4,6-trinitrophenyl-N-methylnitramine (tetryl), has been observed as a slower secondary process, accompanied by O2 consumption. This type of 'redox cycling' was not related to reactions of nitroaromatic anion-radicals, but was caused by the autoxidation of relatively stable reaction products. The logs kcat/Km of all the compounds examined exhibited parabolic dependence on their enthalpies of single-electron- or two-electron (hydride) reduction, obtained by quantum mechanical calculations. This type of quantitative structure-activity relationships shows that the reactivity of nitroaromatics towards E. cloacae nitroreductase depends mainly on their hydride accepting properties, but not on their particular structure, and does not exclude the possibility of multistep hydride transfer.
Źródło:
Acta Biochimica Polonica; 2000, 47, 4; 941-949
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Free radicals in chemistry, biology and medicine: contribution of radiation chemistry
Autorzy:
Bobrowski, K.
Powiązania:
https://bibliotekanauki.pl/articles/147946.pdf
Data publikacji:
2005
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
free radicals
pulse radiolysis
oxidative stress
ionic liquids
long range electron transfer
beta-amyloid peptide
Opis:
The scope of this article is limited to the concept of free radical and its historical background and a brief introduction to time-resolved techniques (pulse radiolysis, laser flash photolysis), which allowed direct observation of free radicals on real time. The selected contributions of pulse radiolysis to better understanding the role of free radical reactions in chemistry, biology and medicine are presented and some selected future research needs and opportunities in radiation chemistry are briefly addressed.
Źródło:
Nukleonika; 2005, 50,suppl.3; 67-76
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Single-electron reduction of quinone and nitroaromatic xenobiotics by recombinant rat neuronal nitric oxide synthase
Autorzy:
Anusevičius, Žilvinas
Nivinskas, Henrikas
Šarlauskas, Jonas
Sari, Marie-Agnes
Boucher, Jean-Luc
Čėnas, Narimantas
Powiązania:
https://bibliotekanauki.pl/articles/1039577.pdf
Data publikacji:
2013
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
antitumour agents
nitroaromatic compounds
electron transfer mechanism
oxidative stress
quinones
Neuronal nitric oxide synthase (nNOS)
Opis:
We examined the kinetics of single-electron reduction of a large number of structurally diverse quinones and nitroaromatic compounds, including a number of antitumour and antiparasitic drugs, and nitroaromatic explosives by recombinant rat neuronal nitric oxide synthase (nNOS, EC 1.14.13.39), aiming to characterize the role of nNOS in the oxidative stress-type cytotoxicity of the above compounds. The steady-state second-order rate constants (kcat/Km) of reduction of the quinones and nitroaromatics varied from 102 M-1s-1 to 106 M-1s-1, and increased with an increase in their single-electron reduction potentials (E17). The presence of Ca2+/calmodulin enhanced the reactivity of nNOS. These reactions were consistent with an 'outer sphere' electron-transfer mechanism, considering the FMNH./FMNH2 couple of nNOS as the most reactive reduced enzyme form. An analysis of the reactions of nNOS within the 'outer sphere' electron-transfer mechanism gave the approximate values of the distance of electron transfer, 0.39-0.47 nm, which are consistent with the crystal structure of the reductase domain of nNOS. On the other hand, at low oxygen concentrations ([O2] = 40-50 μM), nNOS performs a net two-electron reduction of quinones and nitroaromatics. This implies that NOS may in part be responsible for the bioreductive alkylation by two-electron reduced forms of antitumour aziridinyl-substituted quinones under a modest hypoxia.
Źródło:
Acta Biochimica Polonica; 2013, 60, 2; 217-222
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Kinetics and mechanism of electron transfer to pyridinium chlorochromate (VI) from sulfur containing amino acid, L-cysteine in aqueous and micellar media
Autorzy:
Senapati, S.
Das, S.
Mohanty, P.
Patnaik, A.K.
Powiązania:
https://bibliotekanauki.pl/articles/779166.pdf
Data publikacji:
2011
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
kinetyka
przeniesienie elektronu
chlorochromian pirydyny
cysteina
kinetics mechanism
electron transfer
pyridinium chlorochromate
cysteine
micellar media
Opis:
The electron transfer reaction of L-cysteine (RSH) with pyridinium chlorochromate (PCC) has been studied spectrophotometrically over the range 2.0 ≤ 10^3 [RSH] ≤ 6.0; 0.01 ≤ [H+] ≤ 0.2; 298 ≤ T ≤ 318 K and I = 0.3 mol dm-3 (NaClO4). The electron transfer reaction has also been carried out in the presence of anionic, cationic and neutral micelle. The reaction in acid medium is strongly catalyzed by changing [SDS]T (sodium dodecyl sulfate) up to 3 × 10-2 mol dm-3, beyond this concentration of SDS, the rate is retarded. The cationic and neutral micelle has a small effect on the rate. ΔH≠ (kJ mol-1) and ΔS≠ (JK-1 mol-1) values for the k1 and k2 paths are 30.20 ± 0.25, -159.65 ± 0.83 and 29.60 ± 0.62, -127.09 ± 2.17, respectively. The negative activation entropy is indicative of the ordered transition state for the electron transfer reaction. Formation of 2-amino-3-(2-amino-2-carboxy-ethyl) disulfanyl-propanoic acid as product is strongly supported by IR spectra.
Źródło:
Polish Journal of Chemical Technology; 2011, 13, 2; 6-10
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Why chloroplastic ferredoxin: NADPplus oxidoreductase binds to lipids – model membranes study?
Autorzy:
Grzyb, J.
Powiązania:
https://bibliotekanauki.pl/articles/80977.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
conference
ferredoxin
oxidoreductase
enzyme
photosynthetic electron transfer
cytochrome
thylakoid membrane
chloroplast
lipid
nicotinamide adenine dinucleotide phosphate
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:
Monitoring photosynthetic electron transport during stress responses in Arabidopsis
Autorzy:
Shapiguzov, A.
Cui, F.
Overmyer, K.
Kangasjarvi, J.
Powiązania:
https://bibliotekanauki.pl/articles/80094.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
conference
monitoring
plant cell
chloroplast
reactive oxygen species
signal receptor
immune response
electron transfer chain
plant stress
Arabidopsis
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:
Adsorption induced hole transport in thin layers of non-ordered tetracene
Transport dziurowy wzmocniony absorpcją w nieuporządkowanych warstwach tetracenu
Autorzy:
Kania, S.
Kuliński, J.
Powiązania:
https://bibliotekanauki.pl/articles/296629.pdf
Data publikacji:
2015
Wydawca:
Politechnika Łódzka. Wydawnictwo Politechniki Łódzkiej
Tematy:
tetracene films
p-quaterphenyl films
adsorption
electron transfer reactions
warstwa tetracenu
warstwa p-kwaterfenylu
adsorpcja
reakcja transferu ładunku
Opis:
Additional disorder induced by adsorption processes by the molecule of ambient are responsible for deep modulation of conductivity. Observations confirmed the dominated role of the increase of the free carrier concentration due to the increse the shallow trap concentration, for modulation of the conductivity.
Badano proces aktywacji i proces transportu elektronów w warstwach tetracenu poddanych oddziaływaniu powietrza. Badania przeprowadzone za pomocą metody czasu przelotu (TOF), której wyniki posłużyły jako wsadowe do obliczeń parametrów elektrycznych warstw przy wykorzystaniu metody różniczkowej analizy prądów ograniczonych ładunkiem przestrzennym, wykazały koncentrację pułapek Nt = 1,6·1020 cm-3, porównywalną do całkowitej gęstości stanów Nv = 3,3·1021 cm-3; może to świadczyć o nasilonej dyfuzji masy w głąb warstwy.
Źródło:
Scientific Bulletin. Physics / Technical University of Łódź; 2015, 36; 39-47
1505-1013
2449-982X
Pojawia się w:
Scientific Bulletin. Physics / Technical University of Łódź
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Correlated networks in the adsorptionenhanced currents
Skorelowane sieci w prądach wzmocnionych adsorpcją
Autorzy:
Kania, S.
Kuliński, J.
Powiązania:
https://bibliotekanauki.pl/articles/296673.pdf
Data publikacji:
2014
Wydawca:
Politechnika Łódzka. Wydawnictwo Politechniki Łódzkiej
Tematy:
tetracene films
p-quaterphenyl films
adsorption
electron transfer reactions
warstwa tetracenu
warstwa p-kwaterfenylu
adsorpcja
reakcja transferu ładunku
Opis:
Injection of carriers into thin layers of acenes due to adsorption of ethanol activator molecules is considered as a electron transfer reaction between two phases. Complexity of the processes may be diminished with applying electron transfer theory in the meaning of Marcus.
Badano proces aktywacji i proces transportu elektronów w warstwach tetracenu i p-kwaterfenylu. Złożoność procesów towarzyszących przepływowi prądu wzmacnianego adsorpcją wymaga modeli upraszczających. Możliwość zastosowania modelu gwałtownych przemian w tworzeniu strukturalnym oddziałujących wzajemnie sieci prowadzi do możliwości zastosowania hamiltonianu będącego sumą hamiltonianów dla każdego z kanałów transferu ładunku. Stwarza to możliwość zastosowania koncepcji szybkości transferu ładunków na bazie teorii Marcusa reakcji z transferem elektronów.
Źródło:
Scientific Bulletin. Physics / Technical University of Łódź; 2014, 35; 25-31
1505-1013
2449-982X
Pojawia się w:
Scientific Bulletin. Physics / Technical University of Łódź
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zastosowanie teorii funkcjonałów gęstości do modelowania właściwości elektronowych skorpionianowych kompleksów oksodimolibdenowych
Application of density functional theory in model ling of electron properties of oxodimolybdenum scorpionate complexes
Autorzy:
Romańczyk, P.
Brocławik, E.
Powiązania:
https://bibliotekanauki.pl/articles/1286504.pdf
Data publikacji:
2011
Wydawca:
Stowarzyszenie Inżynierów i Techników Przemysłu Chemicznego. Zakład Wydawniczy CHEMPRESS-SITPChem
Tematy:
modelowanie DFT
kompleksy skorpionianowe
kompleksy dwurdzeniowe
transfer elektronu
funkcjonalne materiały molekularne
DFT modelling
scorpionate complexes
binuclear complexes
electron transfer
functional molecular materials
Opis:
W artykule, na przykładzie skorpionianowych kompleksów oksodimolibdenowych o mieszanej walencyjności, przedstawiono zastosowanie modelowania DFT do określenia i interpretacji fizycznej wpływu wzajemnej orientacji grup [MoII,INO]3+,2+ (par donorowo- akceptorowych, D-A) na przepływ gęstości elektronowej we fragmencie Mo-O-Mo. Zależność struktury elektronowej, tj. lokalizacji/ delokalizacji niesparowanego elektronu od wzajemnego położenia lokalnych układów współrzędnych D i A, może nadawać kompleksom właściwości molekularnych przełączników i reostatów.
This paper presents the application of DFT modelling in the determination and physical interpretation of the effect of mutual orientation of [MoII, INO] 3+,2+ groups (donor-acceptor pairs, D-A) on the electron density flow in the Mo-O-Mo moiety, exemplified by oxodimolybdenum scorpionate complexes of mixed valence. The relationship between the electron structure, i.e. localization/ delocalization of unpaired electron and mutual position of D and A coordinate systems, may bestow the properties of molecular switches and rheostats on complexes.
Źródło:
Chemik; 2011, 65, 10; 1093-1100
0009-2886
Pojawia się w:
Chemik
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spin and electron density redistribution upon binding of non-innocent ligand by iron in enzymatic environment: challenges for quantum chemistry
Autorzy:
Brocławik, E.
Borowski, T.
Radoń, M.
Powiązania:
https://bibliotekanauki.pl/articles/1954255.pdf
Data publikacji:
2022-02-01
Wydawca:
Politechnika Gdańska
Tematy:
N,O ligand
Fe
DFT
electron density transfer channels
kanały transferu gęstości elektronowej
Opis:
The quality of the description of a chemical bond between the metal (active site) and the ligand (substrate) critically depends on the electronic processes accompanying the bond formation. However, as far as transition metal centers (TM) in enzymes are considered, most of the properties related to their electronic structure are extremely challenging for quantum chemistry. Especially severe problems appear for the bonding of NO to ferrous sites, e.g. in myoglobin or non-heme enzymes. Therefore, special care has to be shown in the assessment of a quantum chemical method employed with respect to its power in describing the properties of interest. In this work we discuss spin-resolved Fe-NO charge transfers and their relation to the metal spin state, with special attention paid to the interpretation of the bonding between NO and the transition metal center in terms of dative or covalent contributions; furthermore, the impact of spin and the electron transfer on the reactivity of the center is discussed. The stress is put on the role of the coordinating environment in controlling the reaction mechanism via fine-tuning of the spin and the oxidation status of the metal core. This goes in line with the high significance of spin in enzymatic reaction mechanisms (cf. multi-state reactivity proposed for iron enzymes).
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2014, 18, 3; 255--263
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
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