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Tytuł:
Application of Pyrolox sorbent for vanadium(V) ions removal
Autorzy:
Wójcik, Grzegorz
Hubicki, Zbigniew
Powiązania:
https://bibliotekanauki.pl/articles/2146947.pdf
Data publikacji:
2022
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
vanadium(V)
kinetics
removal
sorption
Pyrolox
Opis:
The sorption of vanadium(V) ions from acidic solutions using the Pyrolox sorbent was studied at varying ions concentrations, pH, contact time and temperature. The investigated ions were determined by means of graphite-furnace atomic absorption spectrometry (GF-AAS). The sorption capacity of vanadium(V) ions was examined in the pH range 2-10. The adsorption capacities of vanadium(V) ions depend on the pH values. Therefore, the initial pH 2 of vanadium(V) results in the highest adsorption capacities. The sorption vanadium(V) kinetics was investigated. The experimental data were analyzed using the pseudo-first-order, pseudo-second-order forms, Elovich, and intra-particle diffusion models. The kinetics of vanadium(V) sorption is described by the pseudo-first-order in the best way. The results indicate the endothermic process of V(V) ions sorption. The presented results of vanadium ions recovery from the solutions obtained as a result of spent catalysts leaching indicate the possibility of vanadium recovery.
Źródło:
Physicochemical Problems of Mineral Processing; 2022, 58, 2; art. no. 147974
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hydrogen Dilatation of V-Based Composite Membranes
Autorzy:
Panichkin, Alexander
Mamaeva, Axaule
Kenzhegulov, Aidar
Karboz, Zhanar
Powiązania:
https://bibliotekanauki.pl/articles/2106607.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
hydrogen dilatation
vanadium
composite hydrogen permeable membrane
concentration gradient
deformation
Opis:
One of the problems limiting the use of vanadium as hydrogen permeable membranes is its high dilatation upon hydrogen dissolution in it. The information available for the dilatation coefficient value (Δυ/Ω) is contradictory, experimental information on the hydrogen solubility in vanadium within 100-1000 kPa at from 250 to 700°С is very limited. It does not enable to calculate the membrane dilatation. The article contains the measuring results for dilatation of strips made of vanadium foil 100 μm thick in a hydrogen atmosphere in the pressure range from 75 to 1000 kPa, temperatures from 250 to 700°С. The dilatation coefficient (Δυ/Ω) of polycrystalline vanadium was calculated based on the data obtained for dilatation and data previously published for the hydrogen concentration in the α-solid solution at 400°С. It is 0.165. Isobars for the temperature dependence of the hydrogen concentration in vanadium are calculated and constructed using the dilatation measuring results and the dilatation coefficient values. These data are agreed with theoretical and experimental data published previously. The limiting change in concentration and linear dimensions over the cross section of a hydrogen-permeable membrane from V was estimated at various temperatures and operating pressures at the membrane outlet based on the isobars plotted for temperature dependences of the CH/V. The conclusions are made on the optimal working conditions of Pd/V/Pd membranes when hydrogen is released from hydrogen-containing gas mixtures in accordance with Fick’s 1st law and data published previously for hydrogen concentration value at which solid hydrogen solutions in vanadium become brittle.
Źródło:
Archives of Metallurgy and Materials; 2022, 67, 2; 767--772
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Recovery of Fe and V via selective reduction–magnetic separation of vanadium-titanium magnetite concentrate
Autorzy:
Liu, Liwei
Li, Guofeng
Zhao, Libing
Li, Jinpeng
Li, Yanfeng
Powiązania:
https://bibliotekanauki.pl/articles/2146847.pdf
Data publikacji:
2022
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
vanadium-titanium magnetite concentrate
selective reduction
magnetic separation
Fe separation
V separation
Opis:
With the aim of separating Fe and V, a vanadium-titanium magnetite concentrate was selectively reduced, followed by magnetic separation. The processes accompanying reduction of the vanadium-titanium magnetite concentrate were investigated using thermodynamic simulation, experiments, scanning electron microscopy, and electron probe microanalysis. Appropriate reduction conditions and controlling the amount of CaCO3 promoted the reduction of Fe-containing minerals to metallic Fe. V was released from magnetite, ilmenite, and titanomagnetite, and was inhibited to reduce to metallic V, leading to V enrichment in the non-magnetic products in the form of oxides. Moreover, the Fe particles wrapped the slag phase when the amount of CaCO3 exceeded 8%, which is unfavourable for the magnetic separation of Fe and V. Magnetic products with an Fe content of 87.19%, Fe recovery of 82.62%, V content of 0.09% and non-magnetic products with a V content of 1.00% and a V recovery of 85.49% were obtained when the vanadium-titanium magnetite concentrate was reduced for 100 min at 1623 K with a C/O molar ratio of 2.5 and 8% CaCO3, followed by separating at a magnetic field strength of 85 mT.
Źródło:
Physicochemical Problems of Mineral Processing; 2022, 58, 1; 50--62
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of direct reduction time of vanadium titanomagnetite concentrate on the preparation and photocatalytic performance of calcium titanate
Autorzy:
Li, Xiaohui
Kou, Jue
Sun, Tichang
Wu, Shichao
Tian, Yuechao
Powiązania:
https://bibliotekanauki.pl/articles/1449028.pdf
Data publikacji:
2021
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
vanadium titanomagnetite concentrate
calcium titanate
direction reduction
metallic iron
photocatalytic performance
Opis:
Effects of direct reduction time of vanadium titanomagnetite concentrate (VTCE) on the preparation and photocatalytic performance of calcium titanate were investigated in this study. It was found that extending the reduction time could not only promote the formation of calcium titanate, but also facilitate the reduction of iron minerals in the reduction products. The optimum reduction time was 180min under the conditions of $CaCO_3$ dosage of 18wt%, reduction temperature of 1400℃ and lignite dosage of 70wt%. The reduced iron (Fe grade of 90.95wt%, Fe recovery of 92.21wt%) and calcium titanate were obtained via grinding-magnetic separation. Moreover, calcium titanate prepared via the direct reduction method could be used as a photocatalyst, where the degradation degree of methylene blue increased from 25.13% to 60.14% with the addition of calcium titanate. Furthermore, Langmuir Hinshelwood fitting results indicated that the degradation of methylene blue by the calcium titanate prepared under different reduction times conformed to first-order reaction kinetics, where the photocatalytic degradation rate of methylene blue was noted to be the highest for a reduction time of 180 min.
Źródło:
Physicochemical Problems of Mineral Processing; 2021, 57, 1; 75-86
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Polimery koordynacyjne wanadu : stan obecny i perspektywy
Vanadium coordination polymers : state of art and perspectives
Autorzy:
Augustyniak, Adam W.
Powiązania:
https://bibliotekanauki.pl/articles/1411134.pdf
Data publikacji:
2021
Wydawca:
Polskie Towarzystwo Chemiczne
Tematy:
wanad
sieci metaliczno-organiczne
MOFs
wielościany metaliczno-organiczne
MOP
vanadium
metal-organic frameworks
metal-organic polyhedral
Opis:
Vanadium ions are very attractive building units owing to their coordination diversity. In recent years, metal-organic polyhedra (MOP) and metal-organic frameworks (MOFs) have gradually become attractive materials in various fields due to their unique properties. However, despite this, structures based on vanadium ions are scarce. This short perspective review paper describes representative examples of MOP and MOFs based vanadium, focusing on their structure and their applications.
Źródło:
Wiadomości Chemiczne; 2021, 75, 3-4; 253-269
0043-5104
2300-0295
Pojawia się w:
Wiadomości Chemiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Selective extraction of vanadium from vanadium-titanium magnetite concentrates by non-salt roasting of pellets-H2SO4 leaching process
Autorzy:
Luo, Yi
Che, Xiaokui
Wang, Haixia
Zheng, Qi
Wang, Lei
Powiązania:
https://bibliotekanauki.pl/articles/1445902.pdf
Data publikacji:
2021
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
vanadium-titanium magnetite
pellets
selective extraction
sulfuric acid leaching
Opis:
In this work, a novel process of pellet non-salt roasting and H2SO4 leaching was proposed for the selective extraction of vanadium from vanadium–titanium magnetite concentrate. Vanadium can be leached but the iron impurity was maintained in the pellets. Moreover, the leached pellets can meet the quality requirements of the iron-making process after secondary roasting, realizing comprehensive utilization. The maximal vanadium leaching efficiency was up to 60.3%, whereas 0.17% of the iron impurity was leached. The optimum conditions of pellet roasting and leaching were obtained by single-factor experiments. The X-ray diffraction and scanning electron microscopy–energy disperse X-ray spectrometry analyses showed that the vanadium iron spinel can be oxidized and decomposed into Fe2O3 and vanadate during the roasting process. Given that dilute sulfuric acid can react with vanadate without reacting with Fe2O3 in the leaching process, selective vanadium extraction was realized. This work provides new insights into the industrial production of vanadium–titanium magnetite concentrate involving the direct extraction of vanadium.
Źródło:
Physicochemical Problems of Mineral Processing; 2021, 57, 4; 36-47
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Żelazowanad : metoda oznaczania w powietrzu na stanowiskach pracy
Ferrovanadium : determination in workplace air
Autorzy:
Surgiewicz, Jolanta
Powiązania:
https://bibliotekanauki.pl/articles/1845114.pdf
Data publikacji:
2021
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
żelazowanad
żelazo i jego związki
wanad i jego związki
absorpcyjna spektrometria atomowa
narażenie zawodowe
nauki o zdrowiu
inżynieria środowiska
ferrovanadium
iron and its compounds
vanadium and its compounds
atomic absorption spectrometry
occupational exposure
health sciences
environmental engineering
Opis:
Żelazowanad należy do grupy żelazostopów stosowanych do produkcji stali węglowej, stali stopowej o wysokiej wytrzymałości, odpornej na temperaturę i skręcanie. Żelazowanad w postaci pyłu jest łagodnym środkiem drażniącym dla skóry i dróg oddechowych człowieka. Jednak wśród pracowników narażonych na żelazowanad stwierdzono zmiany patologiczne w układzie oddechowym. Wartość najwyższego dopuszczalnego stężenia (NDS) na stanowiskach pracy dla frakcji wdychalnej żelazowanadu wynosi 1 mg/m³, wartość najwyższego dopuszczalnego stężenia chwilowego (NDSCh) wynosi 3 mg/m³. Przedstawiono metodę oznaczania żelazowanadu do oceny narażenia zawodowego na tę substancję w zakresie 1/10 ÷ 2 wartości NDS. Metoda polega na: pobraniu żelazowanadu zawartego w powietrzu na filtr, mineralizacji filtra w stężonym kwasie azotowym i chlorowodorowym oraz oznaczaniu żelaza i wanadu metodą płomieniową absorpcyjnej spektrometrii atomowej (AAS). Metoda umożliwia oznaczenie żelazowanadu zawartego w powietrzu na stanowiskach pracy we frakcji wdychalnej w zakresie stężeń 0,073 ÷ 2,06 mg/m³ (dla próbki powietrza o objętości 720 l). Uzyskana względna niepewność rozszerzona pomiaru żelazowanadu spełnia wymagania zawarte w normie europejskiej PN-EN 482 dla procedur stosowanych do oznaczania czynników chemicznych. Opracowana metoda umożliwia wykonywanie pomiarów zgodnie z zasadami dozymetrii indywidualnej. Zakres tematyczny artykułu obejmuje zagadnienia zdrowia oraz bezpieczeństwa i higieny środowiska pracy będące przedmiotem badań z zakresu nauk o zdrowiu oraz inżynierii środowiska.
Ferrovanadium belongs to the group of ferroalloys used in the production of carbon steel, high-strength alloy steel. Ferrovanadium dust is a mild irritant to human skin and respiratory tract. However, pathological changes in various zones of the respiratory system were found among workers in the production of ferrovanadium. Currently, maximum allowable concentration value (MAC) for ferrovanadium in workplace air in Poland, for inhalable fraction, is at 1 mg/m³ and STEL at 3 mg/m³ . The article presents a method for determining concentrations of ferrovanadium in the range of 1/10–2 of the MAC. The method consists in collecting ferrovanadium contained in the air in fractions to filters, mineralization of filters with the use of concentrated acids and determination of iron and vanadium with atomic absorption spectrometry (AAS). The developed analytical method makes it possible to determine the inhalable fraction ferrovanadium in workplace air at the concentration range of 0.073–2.06 mg/m³ (for an 720-L air sample). The obtained relative expanded uncertainty of the measurement of ferrovanadium meets the requirements of Standard No. PN-EN 482. This article discusses the problems of occupational safety and health, which are covered by health sciences and environmental engineering.
Źródło:
Podstawy i Metody Oceny Środowiska Pracy; 2021, 1 (107); 97-115
1231-868X
Pojawia się w:
Podstawy i Metody Oceny Środowiska Pracy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of Adding Niobium and Vanadium to Fe-Based Oxide Dispersion Strengthened Alloy
Autorzy:
Park, Chun Woong
Choi, Won June
Byun, Jong Min
Kim, Young Do
Powiązania:
https://bibliotekanauki.pl/articles/353024.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Fe-based ODS
vanadium
niobium
superalloy
hardness
Opis:
In this study, the effects of adding niobium and vanadium to Fe-based oxide dispersion strengthened alloys are confirmed. The composition of alloys are Fe-20Cr-1Al-0.5Ti-0.5Y2 O3 and Fe-20Cr-1Al-0.5Ti-0.3V-0.2Nb-0.5Y2 O3. The alloy powders are manufactured by using a planetary mill, and these powders are molded by using a magnetic pulsed compaction. Thereafter, the powders are sintered in a tube furnace to obtain sintered specimens. The added elements exist in the form of a solid solution in the Fe matrix and suppress the grain growth. These results are confirmed via X-ray diffraction and scanning electron microscopy analyses of the phase and microstructure of alloys. In addition, it was confirmed that the addition of elements, improved the hardness property of Fe-based oxide dispersion strengthened alloys.
Źródło:
Archives of Metallurgy and Materials; 2020, 65, 4; 1265-1268
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microstructure and electrochemical properties of the vanadium alloys after low-temperature nitrogen plasma treatment
Autorzy:
Duriagina, Z. A.
Ryzhak, D. D.
Kulyk, V. V.
Tepla, T. L.
Lemishka, I. A.
Bohun, L. I .
Powiązania:
https://bibliotekanauki.pl/articles/1818517.pdf
Data publikacji:
2020
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
vanadium alloy
surface layers
microhardness
corrosion
stop wanadu
warstwy powierzchniowe
mikrotwardość
korozja
Opis:
Purpose: The proposed research aims to determine the expediency of surface treatment of vanadium alloys of V-Cr and V-Ti systems due to irradiation of their surfaces with low- temperature nitrogen plasma using plasma torch NO-01. Design/methodology/approach: The investigation of microstructure and X-ray fluorescence analysis (XRF) of the samples were performed using an electron microscope TESCAN Vega3. The microhardness (Vickers hardness) of the samples was measured before and after surface treatment. The study of corrosive properties of the surface layers was performed by an electrochemical impedance spectroscopy (EIS) method. Corrosion damages were identified using impedance dependences. Findings: The microstructure of the surface layers of the V-8Ti, V-15Cr, and V-35Cr alloys in the initial state and after plasma treatment have been investigated. The chemical composition of the surface layers is determined and comparative measurements of the microhardness of these alloys are carried out. Corrosion-electrochemical properties (corrosion potentials, electrochemical impedance spectroscopy and constructed potential-dynamic polarization curves) of investigated alloys after treatment with nitrogen plasma are evaluated. Research limitations/implications: The results obtained using laboratory samples should be checked at the conditions of power equipment operation. Practical implications: This treatment has advantages over other methods of surface engineering since it provides strong surface plastic deformation and the possibility of formation of secondary phases resulting in increases in surface hardness and corrosion resistance. Originality/value: Vanadium alloys have significant advantages over other structural materials due to their high thermal conductivity and swelling resistance, high strength and plasticity up to temperatures of 700-800°C, and good weldability.
Źródło:
Archives of Materials Science and Engineering; 2020, 102, 1; 5--12
1897-2764
Pojawia się w:
Archives of Materials Science and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Separation and Immobilization of Vanadium from Industrial Fly Ash as an Insoluble Inorganic Pigmen
Autorzy:
Kwolek, P.
Czubajewski, K.
Wojnicki, M.
Powiązania:
https://bibliotekanauki.pl/articles/351844.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
recovery
inorganic pigments
solubility
vanadium
bismuth
immobilisation
Opis:
It has been shown that the precipitation of bismuth orthovanadate from a fly ash leachate is a promising method of vanadium recovery. BiVO4 obtained after appropriate heat treatment can be sold as a pigment. The yield of recovery of solubilised vanadium is equal to 68% and the precipitate is free from nickel impurity. The precipitate is insoluble in the solutions with pH ≥ 3. In more acidic media the solubility of precipitate increases with the decreasing pH. The solubility of the precipitate increases also with the increasing concentration of chloride ions.
Źródło:
Archives of Metallurgy and Materials; 2020, 65, 2; 901-909
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis of vanadium-enriched oxide materials via modified sol-gel route with the use of waste solutions contaminated with vanadium ions
Autorzy:
Weidner, Ewelina
Piasecki, Adam
Siwińska-Ciesielczyk, Katarzyna
Jesionowski, Teofil
Ciesielczyk, Filip
Powiązania:
https://bibliotekanauki.pl/articles/1450632.pdf
Data publikacji:
2020
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
modified sol-gel method
zirconia
vanadium recovery
hybrid oxide materials
harmful metal ions
Opis:
In this study, the synthesis of zirconia as well as zirconia enriched with vanadium by modified sol-gel method was presented. The modification of the method was based on the replacement of the traditional basic promoter of hydrolysis, which is ammonia, with sodium hydroxide solution. The most favorable conditions for the synthesis of zirconium with a new hydrolysis promoter were selected. A comparative analysis of $ZrO_2$ obtained using various hydrolysis promoters was performed. Both materials exhibited almost the same physicochemical properties, which proves that in this case the nature of the hydrolysis promoter used in sol-gel route does not significantly affect the properties of the $ZrO_2$. Then, synthesis of $ZrO_2$/V systems was carried out using model and real solutions containing vanadium ions as hydrolysis promoters. The solutions formed after vanadium catalyst leaching were used as real solutions. The effect of vanadium concentration and the presence of impurities on the final physicochemical properties of the obtained hybrid materials were investigated via scanning electron microscopy (SEM), dynamic light scattering (DLS), energy-dispersive X-ray microanalysis (EDS), Fourier transform infrared spectroscopy (FT-IR), low-temperature nitrogen sorption (BET), thermogravimetric analysis (TGA). The analysis of the obtained results allows to state that the developed technique for the synthesis of $ZrO_2$ and $ZrO_2$/V systems, using a modified sol-gel method, enabled the production of attractive materials.
Źródło:
Physicochemical Problems of Mineral Processing; 2020, 56, 6; 60-75
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Vanadium catalysts for ethylene-norbornene. Copolymerization
Katalizatory wanadowe w kopolimeryzacji etylenu z norbornenem
Autorzy:
Bihun-Kisiel, Anna
Ochędzan-Siodłak, Wioletta
Powiązania:
https://bibliotekanauki.pl/articles/947407.pdf
Data publikacji:
2020
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Chemii Przemysłowej
Tematy:
vanadium catalyst
copolymerization
ethylene
norbornene
cyclic olefin copolymers
katalizator wanadowy
kopolimeryzacja
etylen
norbornen
kopolimery cyklicznych olefin
Opis:
Cyclic olefin copolymers (COCs) are a promising group of materials with specific, projectable properties. In this group, copolymers of ethylene and norbornene are of particular interest. A variety of transition metal complexes are used for their synthesis, mostly elements from group 4. This review presents the application of vanadium catalysts with various types of ligands in the synthesis of ethylene-norbornene copolymers. The influence of ligands and reaction conditions on the activity of catalyst and selected properties of copolymers are described in this paper.
Kopolimery cyklicznych olefin (COCs) stanowią obiecującą grupę materiałów o specyficznych, możliwych do zaprojektowania właściwościach. Szczególnym zainteresowaniem w tej grupie związków cieszą się kopolimery etylenu z norbornenem. Do ich syntezy stosuje się różnorodne kompleksy metali przejściowych, przede wszystkim pierwiastków z grupy 4. Artykuł stanowi przegląd literatury dotyczącej wykorzystania katalizatorów wanadowych z różnego rodzaju ligandami w syntezie kopolimerów etylenu z norbornenem. Opisano wpływ ligandów i warunków prowadzenia reakcji na aktywność oraz wybrane właściwości otrzymanych kopolimerów.
Źródło:
Polimery; 2020, 65, 11-12; 757-770
0032-2725
Pojawia się w:
Polimery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Vanadium rutin complex sensitizes breast cancer cells via modulation of p53/Bax/Bcl2/VEGF correlated with apoptotic events
Autorzy:
Haifeng, Zhu
Yinghou, Wang
Dan, Liu
Xiuqing, Sun
Furong, Wang
Powiązania:
https://bibliotekanauki.pl/articles/895635.pdf
Data publikacji:
2020-02-29
Wydawca:
Polskie Towarzystwo Farmaceutyczne
Tematy:
apoptosis
Breast Cancer
In vitro assessment
DNA Binding
Vanadium-rutin
Opis:
In pursuit of a novel approach in breast cancer therapy, we explored the ability of vanadium rutin complex to eradicate cancer by efficiently targeting various apoptotic pathways on human breast cancer cell lines. We provide direct proof of the chemotherapeutic potential of vanadium rutin complex by activating p-53 dependent intrinsic apoptosis and modulating the VEGF pathways. The complex was also capable of binding and cleaving CT-DNA at different concentration. The complex was able to inhibit cell viability at 100 and 150 µM doses in both MCF7 and MDA-MB-231 cells. Furthermore, the complex successfully initiated apoptosis in both cell lines by activating the p53 dependant intrinsic apoptotic pathway. In-vitro studies also established that the complex modulated p53, Bax, Bcl2 and VEGF expressions and induced DNA fragmentation in both the cell lines.
Źródło:
Acta Poloniae Pharmaceutica - Drug Research; 2020, 77, 1; 89-98
0001-6837
2353-5288
Pojawia się w:
Acta Poloniae Pharmaceutica - Drug Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Związki kompleksowe chromu(III), wanadu(IV) i kobaltu(II) jako nowe prekatalizatory polimeryzacji olefin
Chromium(III), vanadium(IV) and cobalt(II) complex compounds as new olefin polymerization precatalysts
Autorzy:
Drzeżdżon, Joanna
Powiązania:
https://bibliotekanauki.pl/articles/171572.pdf
Data publikacji:
2020
Wydawca:
Polskie Towarzystwo Chemiczne
Tematy:
chrom
wanad
kobalt
związki kompleksowe
prekatalizatory
polimeryzacja
chromium
vanadium
cobalt
complex compounds
precatalysts
polymerization
Opis:
The olefin polymerization catalysts constitute a large group of various compounds. Metallocene complexes are the largest part of this group. However, due to the instability at industrial plastics temperatures and the decomposition of complexes after MAO (or MMAO) activation, they have been partly replaced by non-metallocene compounds. This article concerns the studies on new non- metallocene precatalysts for the olefin polymerization and oligomerization. The report focuses on the structure and the catalytic activities of the complexes of chromium(III), vanadium(IV) and cobalt(II) with the following ligands: dipicolinate, 2-pyridinecarboxylate, oxalate, oxydiacetate, iminodiacetate, 2,2’- bipyridine, 4,4’-dimethoxy-2,2’-bipyridine, 1,10-phenantroline. These complex compounds are highly active precatalysts for olefin polymerization and oligomerization. The complexes: [Cr(dipic)2][Cr(bipy)(dipic)H20]-2H20 and [Cr(dipic) 2]Hdmbipy2.5H20 deserve special attention because they are new type of the precatalysts i.e. organic salt type complexes composed both of organic cations and anions. These compounds are not only interesting because of their structure but also because of their high catalytic activity.
Źródło:
Wiadomości Chemiczne; 2020, 74, 5-6; 423-437
0043-5104
2300-0295
Pojawia się w:
Wiadomości Chemiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cell-based screening for identification of novel vanadium complexes with multidirectional activity relative to cells associated with metabolic disorders
Autorzy:
Kazek, Grzegorz
Głuch-Lutwin, Monika
Modryl, Barbara
Menaszek, Elżbieta
Szklarzewicz, Janusz
Gryboś, Ryszard
Papież, Monika
Powiązania:
https://bibliotekanauki.pl/articles/93098.pdf
Data publikacji:
2019
Wydawca:
Państwowa Wyższa Szkoła Zawodowa w Tarnowie
Tematy:
vanadium complex
cell-based screening
anti-diabetic activity
kompleks wanadu
badanie przesiewowe oparte na komórkach
aktywność przeciwcukrzycowa
Opis:
In this study, 110 newly synthesized vanadium complexes from different structural groups were screened in three cell-based models representing the main target tissues for anti-diabetic drugs. In glucose utilization in C2C12 myocyte experiments, 93% of vanadium complexes were shown to have equal or greater activity than bis(maltolato)oxovanadium(IV) (BMOV), the methyl analog of bis(ethylmaltolato)oxovanadium(IV) (BEOV) which has been tested in clinical trials. Moreover, 49% and 50% of these complexes were shown to have equal or greater activity than BMOV in lipid accumulation in 3T3-L1 adipocytes and insulin secretion in RINm5F beta cell experiments, respectively. These results were the basis for the selection of compounds for the subsequent steps in the characterization of anti-diabetic properties. This study provides strong support for the application of screening cell-based assays with a phenotypic approach for the discovery of novel anti-diabetic drugs from the vanadium complex class. This is especially desirable due to the multiple and not fully defined mechanisms of action vanadium compounds.
Źródło:
Science, Technology and Innovation; 2019, 4, 1; 47-54
2544-9125
Pojawia się w:
Science, Technology and Innovation
Dostawca treści:
Biblioteka Nauki
Artykuł
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