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Wyszukujesz frazę "Cu" wg kryterium: Temat

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    Wyświetlanie 1-9 z 9
    Tytuł:
    The impact of Cu alloy on auxiliary and invisible options of splash kept CdS slims
    Autorzy:
    Kadhim, Mohammed A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1188099.pdf
    Data publikacji:
    2016
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    CdS
    spray pyrolysis
    optical properties
    Cu concentration
    Opis:
    Cadmium Sulfide and copper alloyed Cd1-xS Cux slims have been set up by the spray pyrolysis technique. The optical gap crevices at unadulterated and doped Cadmium Sulfide were observed to be shifted from (2.34 to 2.45) eV with increment x from (0 to 0.1). The X-beam diffraction (XRD) investigation uncovered that slims were polycrystalline and showed two phases cubic and hexagonal structure with increasing the hexagonal phase with increment Cu ratio.
    Źródło:
    World Scientific News; 2016, 56; 217-228
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Circuit heavy metals in nature
    Autorzy:
    Draszawka – Bołzan, Beata
    Cyraniak, Emil
    Powiązania:
    https://bibliotekanauki.pl/articles/1194065.pdf
    Data publikacji:
    2014
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Cd
    Cu
    Pb
    Zn
    anthropogenic emissions
    heavy metals
    Opis:
    The problem of environmental pollution with heavy metals is still serious, despite numerous activities related to the reduction of anthropogenic emissions of these elements into the environment. There is a growing concentration of many toxic metals in soils and vegetation (remaining in close relation with the state of air quality), and especially in the environment of large urban agglomerations. The paper presents an assessment of the degree of contamination of soil and grass vegetation with heavy metals (Zn, Pb, Cu, Cd) in the vicinity of the communication over Warsaw. Research material obtained from the same locations (samples of soil and grass vegetation) was analyzed (AAS) in terms of the total concentration of metals in soils and its mobile form, while in plants is the total concentration of the corresponding trace the AAS atomic spectrometry. Based on the concentrations of metals in soil and vegetation samples were determined bioaccumulation factors. Methods mobile metals isolated by selective extraction of a 0.05 M EDTA solution. The results obtained were related to the results of similar research conducted two years earlier in 2005. Additionally the effect of leaching of soluble forms of metal particulate pollutants deposited on the surface of vegetation.
    Źródło:
    World Scientific News; 2014, 4; 10-16
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Antiviral Activities of Cu2+ Ions in Viral Prevention, Replication, RNA Degradation, and for Antiviral Efficacies of Lytic Virus, ROS-Mediated Virus, Copper Chelation
    Autorzy:
    Ishida, Tsuneo
    Powiązania:
    https://bibliotekanauki.pl/articles/1177808.pdf
    Data publikacji:
    2018
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Capsid protein
    Copper chelation
    Copper homeostasis
    Copper oxide nanoparticles
    Cu2+ and Cu1+ ions
    DNA/RNA virus
    HSV
    ROS
    Viral replication
    mRNA degradation or decay
    Opis:
    Copper has been known for decades that marked changes of micronutrient homeostasis in the host are accompanied by infection or inflammation. Copper levels in the serum are significantly elevated in response to inflammation that copper accumulates at sites of inflammation. Easily oxidized copper oxide nanoparticles (CuONPs) are widely used as catalysts that the ability of CuONPs to reduce bacterial population and virus application is enhanced. The mechanism of copper-mediated inactivation of herpes simplex virus (HSV) is by which cupric ions oxidatively damage biomolecules. Virus-mediated subjugation and modulation of host lipids during infection that the life cycle of most viruses proceeds through a series of basic steps: binding and internalization, fusion, uncoating, of the viral genome, its replication, assembly of new particles, and budding or release of the newly made viruses. The HIV-1 protein Vpu is an 81-amino-acid (16-kDa) type I which the presence of Vpu leads to the degradation of BST-2 via an endosome-lysosome degradation pathway. Oxidative degradation by a Cu-metalloenzyme, and ubiquitin-mediated degradation of cellular proteins were exploited. Copper can disrupt the lytic cycle of the Coccolithovirus. Lysins represent a novel class of anti-infectives derived from bacteriophage which lysins are bacterial cell wall hydrolytic enzymes that selectively and rapidly kill specific bacteria. Regarding copper induced cellular toxicity, several mechanisms have been proposed based on the formations of ROS by free Cu ions as cupric and cuprous ions can participate in redox reactions. ROS (O2ˉ,･OH, OHˉ), Cu+ and H2O2 play the important roles for viral inactivations. Thujaplicin-copper chelates inhibit influenza virus-induced apoptosis. Pyrrolidine dithiocarbamate as a metal ion binding agent inhibits the activity of the viral proteases of polyprotein processing and RNA replication of HRV. Chelation enables metals are capable of ligand scavenging via complexation, since reverse transcriptase enzyme inhibits the growth and replication of RNA tumor viruses. Thus, copper complex and copper chelation enhance antiviral efficacy.
    Źródło:
    World Scientific News; 2018, 99; 148-168
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Cu2+/Zeolite catalyzed synthesis and evaluation of antimicrobial activities of some chalcones
    Autorzy:
    Thirunarayanan, G.
    Kumar, N. Dinesh
    Powiązania:
    https://bibliotekanauki.pl/articles/1179609.pdf
    Data publikacji:
    2017
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Antimicrobial activities
    Aryl chalcones
    Cu2+/Zeolite
    IR and NMR spectra
    Opis:
    Some aryl chalcones have been synthesized by Cu2+/Zeolite catalyzed aldol condensation of aryl methyl ketones and substituted benzaldehydes under microwave irradiation conditions. The yields of the synthesized chalcones are more than 85%. These chalcones were characterized by their physical constants and spectroscopic data. The antimicrobial activities of synthesized chalcones were studied by Bauer-Kirby disc diffusion method.
    Źródło:
    World Scientific News; 2017, 74; 251-266
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of Nano-Copper – Substituted Lead Zirconate as Surface Catalyst for Oxidative Degradation of Organic Dye
    Autorzy:
    Elsabawy, Khaled M.
    Bediwya, Marwa M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1193007.pdf
    Data publikacji:
    2016
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Cu-doped-PLZ
    Fuchsine dye
    Kinetics
    SE-microscopy
    X-ray Diffraction
    oxidative Degradation
    Opis:
    The oxidative decomposition reactions of fuchsine dye on the surface of nano-catalyst Cu0.5Pb0.5ZrO3 were studied carefully in an aqueous solution in the presence of H2O2 under condition of pseudo-first order reaction. The catalyst was prepared by solid state route using pure nominal composition of metal oxides. The structural and micro-structural properties of the catalyst were characterized well by XRD, SEM and AFM respectively. Many of the kinetic parameters were investigated in this article, results obtained indicated that, the rate of oxidative degradation of acid fuchsine dye was found to be pH-dependent. The mechanism was proposed and the activation parameters were calculated.
    Źródło:
    World Scientific News; 2016, 31; 111-124
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Green Synthesis of Copper Nanoparticles Using Ocimum sanctum L. (Tulsi) and Piper nigrum L. (Pepper Seed) for Pollution Free Environment
    Autorzy:
    Nirmala, M.
    Kavitha, B.
    Nasreen, S.
    Kiruthika, S.
    Divya, B.
    Manochitra, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1031782.pdf
    Data publikacji:
    2020
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Copper
    Copper nano particles
    Cu
    Diffraction
    Green synthesis
    Ocimum sanctum
    Pepper
    Piper nigrum
    Tulsi
    Opis:
    Synthesis of nanoparticles using plant leaf extract is an eco-friendly, non-toxic and cost efficient approach in the field of nanotechnology. In this study, biosynthesis of stable copper nanoparticles were prepared by using Ocimum sanctum and Piper nigrum extract. These biosynthesized Cu nanoparticles were characterized with the help of X-Ray diffraction (XRD), Scanning Electron Microscopy (SEM) and Fourier transforms infrared spectroscopy (FTIR). The crystalline size of the Copper Nanoparticles prepared from Tulsi extract is little smaller than Copper nanoparticles prepared from Pepper extract. SEM images of Copper nanoparticles showed that the cluster formation, presence of smaller and larger grains. FTIR analysis revealed that the functional groups present in the Copper nanoparticles prepared from both Tulsi and Pepper extracts. Thus, this method can be used for rapid and ecofriendly biosynthesis of stable copper nanoparticles and can be used for catalytic agent, anti-microbial, anti-fungal, anti-biotic, nanosensor, super conducting material, solar cell applications.
    Źródło:
    World Scientific News; 2020, 150; 105-117
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    SEM and EDS analysis of enriched in phosphorus and copper coatings fabricated by AC-PEO treatment
    Autorzy:
    Rokosz, Krzysztof
    Hryniewicz, Tadeusz
    Pietrzak, Kornel
    Dudek, Łukasz
    Powiązania:
    https://bibliotekanauki.pl/articles/1178082.pdf
    Data publikacji:
    2018
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    CP Titanium Grade 2
    Micro Arc Oxidation (MAO)
    Plasma Electrolytic Oxidation (PEO)
    copper nitrate Cu(NO3)2∙3H2O
    Opis:
    In the present paper, SEM and EDS studies of coatings obtained on CP Titanium Grade 2 under sinusoidal alternating voltage (AC) with frequency 50 Hz in Plasma Electrolytic Oxidation (PEO) process at voltages of 200 Vpp, 250 Vpp and 300 Vpp during 3-minute treatments, are displayed. Based on SEM micrographs it may be stated that the porous surfaces, which are needed for biomedical and catalysis application, are obtained only for samples fabricated at 200 Vpp. It was found out that thickest and most morphologically developed surfaces were obtained at 200 Vpp, too. The surfaces obtained at 250 Vpp and 300 Vpp are cracked and had low concentration of copper, i.e. 0.9 at% and 1.1 at%, respectively, while that one obtained at 200 Vpp was porous and had 8.6 at% copper.
    Źródło:
    World Scientific News; 2018, 95; 246-259
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    SEM and EDS studies of selected porous coatings obtained on titanium by Plasma Electrolytic Oxidation
    Autorzy:
    Rokosz, Krzysztof
    Hryniewicz, Tadeusz
    Pietrzak, Kornel
    Dudek, Łukasz
    Malorny, Winfried
    Powiązania:
    https://bibliotekanauki.pl/articles/1178480.pdf
    Data publikacji:
    2017
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    CP Titanium Grade 2
    Micro Arc Oxidation (MAO)
    Plasma Electrolytic Oxidation (PEO)
    calcium nitrate Ca(NO3)2∙4H2O
    copper nitrate Cu(NO3)2∙3H2O
    magnesium nitrate Mg(NO3)2∙6H2O
    Opis:
    In present work, SEM and EDS results of porous and enriched in calcium, copper, magnesium and phosphorus coatings, which were obtained during 3-minute treatments of Plasma Electrolytic Oxidation PEO (Micro Arc Oxidation MAO) processes on CP Titanium Grade 2 at two potentials, i.e. 500 VDC and 650 VDC, are presented. It was found that the voltage of that process influences the chemical composition of coatings shapes obtained on titanium in electrolytes containing calcium, copper and magnesium nitrates. The pores shapes of PEO coatings formed on titanium in electrolytes containing calcium, copper and magnesium nitrates are presented, too. In addition, it was also noted that with using of higher voltage (here 650 VDC) of PEO treatments, the higher Ca/P, Cu/P and Mg/P ratios were found than those after treatments at 500 VDC.
    Źródło:
    World Scientific News; 2017, 70, 2; 71-85
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Porous PEO coatings on titanium, obtained under DC regime, enriched in magnesium, calcium, zinc, and copper
    Autorzy:
    Rokosz, Krzysztof
    Hryniewicz, Tadeusz
    Pietrzak, Kornel
    Dudek, Łukasz
    Powiązania:
    https://bibliotekanauki.pl/articles/1156239.pdf
    Data publikacji:
    2018
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    plasma electrolytic oxidation (peo)
    micro arc oxidation (mao)
    cp titanium grade 2
    calcium nitrate ca(no3)2•4h2o
    magnesium nitrate mg(no3)2∙6h2o
    zinc nitrate zn(no3)2∙6h2o
    copper nitrate cu(no3)2∙3h2o
    Opis:
    In the present paper, the analysis of SEM and EDS results of porous and enriched in calcium, magnesium, zinc, copper and phosphorus coatings, obtained during 3-minute treatments performed by Plasma Electrolytic Oxidation (PEO)/Micro Arc Oxidation (MAO) processes on CP Titanium Grade 2, is presented. The PEO process was carried out at DC potentials of 500 VDC, 575 VDC, and 650 VDC in electrolytes containing 125 g Ca(NO3)2•4H2O, and 125 g Mg(NO3)2∙6H2O, and 125 g Zn(NO3)2∙6H2O, and 125 g Cu(NO3)2∙3H2O in 1 L H3PO4. It was found that obtained coatings have pores with different shapes and diameters and/or size/dimentions. The Ca/P, Mg/P, Zn/P, Cu/P, and M/P ratios (M=Ca+Mg+Zn+Cu) were equal to 0.074, 0.046, 0.056, 0.042, and 0.218, respectively. The highest value of each of these ratios was recorded for 650 VDC. It may be concluded that the obtained PEO coatings structures most likely are similar to hydroxyapatite-like structures, in which the Ca2+ may be replaced with Zn2+, Mg2+, Cu2+.
    Źródło:
    World Scientific News; 2018, 94, 2; 99-114
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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