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    Wyświetlanie 1-11 z 11
    Tytuł:
    Chemosensory porfirynowe. Oddziaływanie 2H-porfiryn z wybranymi akceptorami elektronowymi
    Porphyrin chemosensor. Interaction of 2H-porphyrins with selected electron acceptors
    Autorzy:
    Dyrda, G.
    Słota, R.
    Mele, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/143157.pdf
    Data publikacji:
    2014
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Przemysłu Chemicznego. Zakład Wydawniczy CHEMPRESS-SITPChem
    Tematy:
    porfiryny
    chemosensor
    akceptor elektronów
    porphyrins
    electron acceptor
    Opis:
    Zbadano możliwość zastosowania 5,10,15,20-tertrakis-[-4‒2-(3-pentadecylofenoksy)-etoksy]fenyloporfiryny, jako chemosensora akceptorów elektronów: HCl, TFA i BF3, w fazie stałej, w postaci cienkiej warstwy na nośniku szklanym oraz w fazie ciekłej w benzenie. W widmie UV-Vis chemosensora pod wpływem akceptora następują charakterystyczne zmiany w położeniu pasm, połączone ze zmianą barwy układów. Wskazuje to na dużą wrażliwość porfiryny na działanie badanych akceptorów.
    The possibility to use 5,10,15,20-tetrakis-[-4–2-(3-pentadecylphenoxy)-ethoxy]phenylporphyrin as a chemosensor for the detection of electron acceptors: HCl, TFA and BF3 in solid-phase in the form of thin film on glass carrier plate and in liquid phase in benzene. When chemosensor is under the influence of acceptor, the characteristic changes occur in the position of bands in its UV-VIS spectrum accompanied by the change of system colour. This indicates high sensitivity of porphyrin to action of studied acceptor systems.
    Źródło:
    Chemik; 2014, 68, 4; 396-401
    0009-2886
    Pojawia się w:
    Chemik
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A comparison of two enzymatic methods of clinical dextran production
    Autorzy:
    Sikora, B.
    Kubik, C.
    Bielecki, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/410412.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Łódzka. Wydawnictwo Politechniki Łódzkiej
    Tematy:
    dextransucrase
    dextranase
    acceptor dextrans
    clinical dextran
    dekstranosacharaza
    dekstranaza
    dekstran kliniczny
    Opis:
    The aim of this study was to evaluate and compare of the two enzymatic methods of clinical dextran production were compared. The reactions were performed at 30°C and pH 5.4 in solutions containing different amounts of sucrose, using dextransucrase (DS, in the presence of dextranase (D) (method 1) or acceptor dextrans (method 2). The activity of Leuconostoc mesenteroides L dextransucrase (DS), which converts sucrose to dextran, was 0.4 U ml-1 in both the methods. As much as 53-56% of clinical dextran fractions were obtained for 28 h from 10% sucrose solutions, which contained 1.5% or 2.5% acceptor dextrans with molecular mass of 10 and 15 kDa, respectively. Approximately 50% of these fractions was obtained (also in 28 h) from 10% sucrose solutions by using 0.004 U ml-1 of DN, added to reaction mixtures 5 h later than our experiments indicate that the clinical dextran can be efficiently produced by using both the compared methods, which employ either acceptor dextrans with definite molecular mass, or the dextranase. Because consumption of the latter enzyme is rather small, and it is easily available, thus this method should be attractive for clinical dextran manufacturers.
    Źródło:
    Biotechnology and Food Science; 2017, 81, 2; 125-136
    2084-0136
    2299-6818
    Pojawia się w:
    Biotechnology and Food Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electron-transfer complexation of morpholine donor molecule with some π – acceptors: Synthesis and spectroscopic characterizations
    Autorzy:
    Al-Wasidi, Asma S.
    Al-Jafshar, Nawal M.
    Al-Anazi, Amal M.
    Alosaimi, Eid H.
    Refat, Moamen S.
    El-Zayat, Lamia
    Al-Omar, Mohamed A.
    Naglah, Ahmed M.
    El-Nour, K.M. Abou
    Powiązania:
    https://bibliotekanauki.pl/articles/778928.pdf
    Data publikacji:
    2019
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    Morpholine
    π-acceptor
    CT complex
    photometric titration
    infrared
    Benesi-Hildebrand
    Opis:
    Morpholine is an interesting moiety that used widely in several organic syntheses. The intermolecular charge-transfer (CT) complexity associated between morpholine (Morp) donor with (monoiodobromide “IBr”, 2,3-dichloro-5,6-dicyano-1,4-benzoquinone “DDQ”, 2,6-dichloroquinone-4-chloroimide “DCQ” and 2,6-dibromoquinone-4-chloroimide “DBQ”) π–acceptors have been spectrophotometrically investigated in CHCl3 and/or MeOH solvents. The structures of the intermolecular charge-transfer (CT) were elucidated by spectroscopic methods like, infrared spectroscopy. Also, different analyses techniques such as UV-Vis and elemental analyses were performed to characterize the four morpholine [(Morp)(IBr)], [(Morp)(DDQ)], [(Morp)(DCQ)] and [(Morp)(DBQ)] CT-complexes which reveals that the stoichiometry of the reactions is 1:1. The modified Benesi-Hildebrand equation was utilized to determine the physical spectroscopic parameters such as association constant (K) and the molar extinction coefficient (ε).
    Źródło:
    Polish Journal of Chemical Technology; 2019, 21, 4; 82-88
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Reducing Volatile Organic Compound Emissions Using Biotrickling Filters and Bioscrubber Systems
    Autorzy:
    Shihab, Mohammed Salim
    Mhemid, Rasha Khalid Sabri
    Saeed, Liqaa I.
    Ismail, Hanan Haqi
    Alp, Kadir
    Powiązania:
    https://bibliotekanauki.pl/articles/2202121.pdf
    Data publikacji:
    2022
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    volatile organic sulfur compounds
    ethanethiol
    biotrickling filter
    bioscrubber
    electron acceptor
    anoxic conditions
    Opis:
    A comparative study was conducted for differentiating between attached and suspended growth, represented by a lab-scale biotrickling filter and bio-scrubber under anoxic conditions, respectively. However, malodorous ethanethiol gas (ET) that was categorized as one of the volatile organic sulfur compounds (VOSCs) was studied using a variety of settings and parameters. In contrast, NO3− can be used as an electron acceptor in the bioconversion of ET gas to elemental sulfur and/or sulfate when no oxygen is available. Empty bed residence times (EBRTs), gas to liquid ratios (G/Ls) (40, 60, 80, 100, 150), and inlet concentrations (150, 300, 800, and 1500 mg/m3) were all investigated in relation to ET removal efficiency (RE) (30, 60, 90, and 120 s). While the G/L ratio of 80 resulted in efficient ET removal (more than 90.8% for 150 mg/m3 of inlet concentration), it could only achieve the extraction of 80.6% for 1500 mg/m3 of inlet concentration at a fixed EBRT of 60 s. These results were based on the performance of a lab-scale anoxic biotrickling filter. Even though mass transfer constraints and poor solubility of ET were factors, the performance of the biotrickling filter under anoxic settings was superior to that of the bioscrubber and improved the low oxidation rates of ET.
    Źródło:
    Journal of Ecological Engineering; 2022, 23, 10; 255--268
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Donorowo-akceptorowe struktury oligopirolowe : projektowanie, synteza i właściwości
    Donor-acceptor oligopyrroles : design, synthesis, and properties
    Autorzy:
    Stępień, Marcin
    Powiązania:
    https://bibliotekanauki.pl/articles/1409858.pdf
    Data publikacji:
    2021
    Wydawca:
    Polskie Towarzystwo Chemiczne
    Tematy:
    pirol
    układy donorowo-akceptorowe
    chromofory
    synteza
    pyrrole
    donor-acceptor systems
    chromophores
    organic synthesis
    Opis:
    The review summarizes one decade of research carried out in the Stępień Laboratory at the University of Wrocław. We focus on the group’s contributions to pyrrole chemistry, notably the development of donor-acceptor pyrrole hybrids and their use as building blocks in the synthesis of porphyrins, small-molecule dyes, and nanographene analogues.
    Źródło:
    Wiadomości Chemiczne; 2021, 75, 5-6; 593-602
    0043-5104
    2300-0295
    Pojawia się w:
    Wiadomości Chemiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Denitrification-Dependent Anaerobic Oxidation of Methane in Freshwater Sediments of Reservoirs in SE Poland
    Autorzy:
    Szal, Dorota
    Gruca-Rokosz, Renata
    Powiązania:
    https://bibliotekanauki.pl/articles/124242.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    denitrification-dependent oxidation of methane
    anaerobic oxidation of methane
    electron acceptor
    sediment incubation experiment
    Opis:
    The results presented here concern the anaerobic oxidation of methane (CH4) coupled with denitrification (i.e. a process abbreviated to DAMO) in the freshwater sediments of dam reservoirs located in Rzeszów, Maziarnia and Nielisz, SE Poland. The DAMO rate was determined experimentally by adding a 13CH4 isotope marker and NO3as an electron acceptor. The sediments were collected once, in autumn (September), with incubation of the 0–5, 5–10 and 10–15 cm layers then carried out at 10°C, as the temperature corresponding to the in situ conditions at the given time of the year. The DAMO rates were set against the results for the anaerobic oxidation of methane (AOM), which were obtained by incubation of reservoir sediments with the 13CH4 isotope marker alone. The DAMO rates noted were of 0.03–0.69 nmol∙g-1∙h-1 for Rzeszów Reservoir; 0.04–0.47 nmol∙g-1∙h-1 for Maziarnia Reservoir and 0.19–1.04 nmol∙g-1∙h-1 for Nielisz Reservoir. Overall, it was typical for the DAMO rates to be about twice as high as the rates of AOM with no electron acceptor added. The addition of NO3did not accelerate the methane oxidation significantly in any of the sediment layers from Maziarnia Reservoir, while the effects in Rzeszów Reservoir sediments were confined to the 10–15 cm layer. While the DAMO rates were progressively higher in the deeper layers of sediment from Maziarnia Reservoir, the trend was the reverse (downward) with depth at the Rzeszów and Nielisz sites. The results indicate that the process abbreviated as DAMO takes place in dam reservoirs and is related, not only to the presence of NO3-, but also to the sediment parameters.
    Źródło:
    Journal of Ecological Engineering; 2019, 20, 9; 218-227
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Anaerobic oxidation of methane in freshwater ecosystems
    Autorzy:
    Szal, Dorota
    Gruca-Rokosz, Renata
    Powiązania:
    https://bibliotekanauki.pl/articles/105016.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Rzeszowska im. Ignacego Łukasiewicza. Oficyna Wydawnicza
    Tematy:
    anaerobic oxidation of methane
    electron acceptor
    methanotrophic archaea
    emisja metanu
    akceptor elektronów
    zbiornik wodny
    warunki beztlenowe
    Opis:
    Anaerobic oxidation of methane (AOM) is a biochemical process that plays an important role in aquatic ecosystems, as it significantly reduces the emission of methane (CH4 ) to the atmosphere. Under anaerobic conditions, CH4 can be oxidized with electron acceptors, such as sulphates (SO42-), nitrates (NO3-) or nitrites (NO2-), iron (Fe3+), manganese (Mn4+) and humic substances. The anaerobic oxidation of methane is mainly regulated by anaerobic methanotrophic archaea (ANME) and sulphate reducing bacteria. The AOM process is crucial to understand the CH4 cycle and anticipate future emissions of the gas from water reservoirs. The process is widely described in marine environments, however very little is known about its occurrence and importance in freshwater systems. There is a great demand for this kind of the research, especially in ecosystems exposed to long-term anaerobic conditions, which may be in degraded reservoirs.
    Źródło:
    Czasopismo Inżynierii Lądowej, Środowiska i Architektury; 2019, 66, 1; 17-26
    2300-5130
    2300-8903
    Pojawia się w:
    Czasopismo Inżynierii Lądowej, Środowiska i Architektury
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Anaerobic oxidation of methane in freshwater ecosystems
    Autorzy:
    Szal, Dorota
    Gruca-Rokosz, Renata
    Powiązania:
    https://bibliotekanauki.pl/articles/2065743.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Rzeszowska im. Ignacego Łukasiewicza. Oficyna Wydawnicza
    Tematy:
    anaerobic oxidation of methane
    electron acceptor
    methanotrophic archaea
    emisja metanu
    akceptor elektronów
    zbiornik wodny
    warunki beztlenowe
    Opis:
    Anaerobic oxidation of methane (AOM) is a biochemical process that plays an important role in aquatic ecosystems, as it significantly reduces the emission of methane (CH4 ) to the atmosphere. Under anaerobic conditions, CH4 can be oxidized with electron acceptors, such as sulphates (SO42-), nitrates (NO3-) or nitrites (NO2-), iron (Fe3+), manganese (Mn4+) and humic substances. The anaerobic oxidation of methane is mainly regulated by anaerobic methanotrophic archaea (ANME) and sulphate reducing bacteria. The AOM process is crucial to understand the CH4 cycle and anticipate future emissions of the gas from water reservoirs. The process is widely described in marine environments, however very little is known about its occurrence and importance in freshwater systems. There is a great demand for this kind of the research, especially in ecosystems exposed to long-term anaerobic conditions, which may be in degraded reservoirs.
    Źródło:
    Czasopismo Inżynierii Lądowej, Środowiska i Architektury; 2019, 66, 1; 17--26
    2300-5130
    2300-8903
    Pojawia się w:
    Czasopismo Inżynierii Lądowej, Środowiska i Architektury
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Prolina – pospolity aminokwas wyjątkowy katalizator. Część II, Międzycząsteczkowa kondensacja aldolowa
    Proline as a common amino acid and an exceptional catalyst. Part II, Intermolecular aldol reaction
    Autorzy:
    Kołodziejska, R.
    Wróblewski, M.
    Karczmarska-Wódzka, A.
    Studzińska, R.
    Dramiński, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/171560.pdf
    Data publikacji:
    2013
    Wydawca:
    Polskie Towarzystwo Chemiczne
    Tematy:
    międzycząsteczkowa reakcja aldolowa donor
    akceptor
    prolina
    anti-aldole
    intermolecular aldol reaction
    donor
    acceptor
    proline
    anti-aldol
    Opis:
    Proline in organic synthesis is used as a small molecular organocatalyst. In a catalytic act proline, similarly to an enzyme, activates reagents, stabilizes transition state and influences an orientation of substrates [1–12]. Proline works as aldolase I (so called microaldolase I). In comparison with other amino acids it shows exceptional nucleophilicity which makes imines and enamines formation easier. In the intermolecular aldol reaction proline was used for the first time by List and co-workers (Scheme 1) [3, 9, 20]. Since then an immense progress has been observed in this field. Several aldolization reactions were performed in the presence of proline. Reactions of this type proceed between the donor (nucleophile) and the acceptor (electrophile). In aldol reaction the donors can be both ketones and aldehydes which next are condensed with ketones and aldehydes acting as electrophiles (Scheme 2–18; Tab. 1–7) [21–72]. The presence of proline ensures not only high yield of homo- and heteroaldolization but mainly enables conducting enantio- and diastereoselective synthesis. Intermolecular proline-catalyzed aldol condensation proceeds according to enamine mechanism. Anti-aldols, which make a valuable source of intermediates in the synthesis of important biologically active compounds, are mainly obtained in this reaction [35–44, 54, 58, 62, 63, 68, 69, 71].
    Źródło:
    Wiadomości Chemiczne; 2013, 67, 11-12; 1027-1050
    0043-5104
    2300-0295
    Pojawia się w:
    Wiadomości Chemiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sequence and preference in the use of electron acceptors in flooded agricultural soils
    Autorzy:
    Włodarczyk, T.
    Brzezińska, M.
    Stępniewski, W.
    Majewska, U.
    Szarlip, P.
    Księżopolska, A.
    Pazur, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2083038.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Instytut Agrofizyki PAN
    Tematy:
    electron acceptor use
    N2O net use
    O2 consumption
    NO3¯ reduction
    flooded soils after drought
    Opis:
    Specifically, it was tested whether the presence of O2 in the headspace modified the sequence and preference of electron acceptor use under hypoxic conditions after prolonged drought in arable soils. This laboratory study was conducted in order to examine the use of electron acceptors: oxygen (O2), nitrate (NO3¯) and nitrous oxide (N2O), during aerobic and anaerobic respiration (denitrification). Agricultural soils (Typic Dystrudepts) classified as sandy, silty and loamy soils from arable top soils (0-30 cm) were used in the study. The change of oxidation states of different chemical species in the soil affected the use of electron acceptors during denitrification. The use of O2, NO3¯ and net N2O use was gradual and differed greatly among the soils. Furthermore, microorganisms were shown to be able to use all three investigated electron acceptors simultaneously, but with clearly visible preferences. The rate of electron acceptor use per day differentiated the investigated soils into a few different groups. Overall, the results of this study indicated that N2O was a more preferable electron acceptor than NO3¯ when O2 was present in the headspace for the most investigated soils. Moreover, a correlation existed between the final electron acceptor use and particle-size distribution and the native organic C content (Corg). The rate of electron acceptor use per day calculated for O2, NO3¯ and N2O may provide very important information for distinguishing the preference of electron acceptor use during aerobic and nitrate respiration in agroecosystems under hypoxic conditions after prolonged drought for different kinds of electron acceptor.
    Źródło:
    International Agrophysics; 2021, 35, 1; 61-71
    0236-8722
    Pojawia się w:
    International Agrophysics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The optimisation of chromatographic conditions for the determination of acceptor-donor properties of graphene oxide and reduced graphene oxide
    Autorzy:
    Grajek, H.
    Jonik, J.
    Rutkowski, L.
    Purchała, M.
    Wawer, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/105776.pdf
    Data publikacji:
    2018
    Wydawca:
    Centrum Badań i Innowacji Pro-Akademia
    Tematy:
    inverse gas chromatography
    reduced graphene
    oxidized graphene
    acceptor-donor properties
    odwrócona chromatografia gazowa
    zredukowany grafen
    utleniony grafen
    właściwości donorowo-akceptorowe
    Opis:
    The oxidised and reduced graphene samples (having different surface functionalities) were studied by inverse gas chromatography to characterise their acceptor-donor properties. The DN values denoting the donor number in the Gutmann scale and the AN* values denoting the acceptor number in the Riddle-Fowkes scale have been chosen in the estimation of the electron-acceptor parameter KA and electron-donor parameter KD values.
    Źródło:
    Acta Innovations; 2018, 26; 5-20
    2300-5599
    Pojawia się w:
    Acta Innovations
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-11 z 11

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