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    Wyświetlanie 1-6 z 6
    Tytuł:
    4-amine-2-mercaptopyrimidine modified silica gel applied in Cd(II) and Pb(II) extraction from an aqueous medium
    Autorzy:
    Pereira, A.S.
    Ferreira, G.
    Caetano, L.
    Castro, R.S.D.
    dos Santos, A.
    Padilha, P.M.
    Castro, G.R.
    Powiązania:
    https://bibliotekanauki.pl/articles/778413.pdf
    Data publikacji:
    2010
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    4-amino-2-merkaptopirymidyna
    krzemionka
    ekstrakcja metali
    środowisko wodne
    4-amine-2-mercaptopyrimidine
    silica
    metal extraction
    aqueous medium
    Opis:
    This paper discusses silica surface modification by a process involving a two-step reaction: anchoring of a silylating agent, followed by an attachment of a 4-amino-2-mercaptopyrimidine molecule. The modified material (Si-BP) was successfully characterized by the FTIR spectra, which revealed amine absorption bands, and through 13C and 29Si NMR spectra, which confirm the proposed structure of the modified silica (Si-BP). Si-BP was used to extract cadmium and lead from an aqueous medium at 298 K. The Si-BP kinetics towards metal ions was very fast, i.e., about 10 minutes, although extraction was significantly impaired at pH 3. The series of adsorption isotherms were adjusted to a modified Langmuir equation and the maximum extraction capacity was 0.193 and 0.387 mmol g-1 for Cd(II) and Pb(II), respectively. An analysis of the Ř values lead to the inference that the resulting metal ligand complex was type 1:1.
    Źródło:
    Polish Journal of Chemical Technology; 2010, 12, 1; 7-11
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Attachment of 2,2-bipyridine onto a silica gel for application as a sequestering agent for copper, cadmium and lead ions from an aqueous medium
    Autorzy:
    Souza, E. J.
    Cristante, V. M.
    Padilha, P. M.
    Jorge, S. M. A.
    Martines, M. A. U.
    Silva, R. I. V.
    Carmo, D. R.
    Castro, G. R.
    Powiązania:
    https://bibliotekanauki.pl/articles/779827.pdf
    Data publikacji:
    2011
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    2,2-bipirydyna
    żel krzemionkowy
    adsorpcja
    jony metali
    2,2'-bipyridine
    silica gel
    adsorption
    metal ions
    Opis:
    A method was developed to attach 2,2-bipyridine (BP) onto a silica gel surface by a two-step reaction. The fi rst step consisted of a reaction between the matrix and a silylating agent, 3-chloropropyltrimethoxysilane. In the second step of the reaction, a ligand molecule was attached onto Si-CPTS, yielding the product Si-BP. The modified material contained 0.431±0.01 mmol of 2,2-bipyridine per gram of modified silica, as confirmed by FT-IR spectra of the proposed structure. The surface modification was characterized by the BET technique, which revealed a decrease in the surface area from 614 to 450 m2 g-1. The series of adsorption isotherms for the metal ions were adjusted to fit a modified Langmuir equation. The maximum number of moles of copper, cadmium and lead ions adsorbed was 0.64, 0.53, and 0.54 mmol g-1, respectively. The surface saturation was calculated as ¢ fraction and the values obtained, Cu(II) =1.160, Cd(II) = 1.044 and Pb(II) = 0.997, suggest a type 1:1 metal-ligand complex.
    Źródło:
    Polish Journal of Chemical Technology; 2011, 13, 4; 28-33
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Susceptibility of Hypsipyla grandella (Lepidoptera: Pyralidae) to Bacillus thuringiensis strains
    Autorzy:
    Castro, M.T.
    Montalvao, S.C.L.
    Monnerat, R.G.
    Powiązania:
    https://bibliotekanauki.pl/articles/66443.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Hypsipyla grandella
    Lepidoptera
    Pyralidae
    susceptibility
    Bacillus thuringiensis
    pest
    Meliaceae
    insect attack
    mahogany
    Swietenia macrophylla
    cedar
    Cedrella odorata
    andiroba
    Carapa guianensis
    branch
    shoot
    leaf
    fruit
    bark
    root
    Brazil
    Opis:
    The use of Bacillus thuringiensis (Bt) to control insect pests has already been established in various agronomic and forest crops. It is a bacterium that does not pollute the environment, is safe for mammals and vertebrates, lacks toxicity to plants and specifically targets insects. To date in-depth studies have not been conducted about the use of Bt to control the main pest of mahogany (Swietenia macrophylla King) and other Meliaceae species, the Hypsipyla grandella Zeller (Lepidoptera: Pyralidae). Therefore, this study aimed to test the pathogenicity of Bt strains on H. grandella caterpillars, as well to determine the lethal concentration required to kill 50% of the population (LC50) of the most promising strains. Ten strains of Bt toxic to lepidopteran proven in previous trials were used and these were incorporated into a natural diet with mahogany seeds to check their mortality. The LC50 of the top five strains was determined. The results indicate that H. grandella is highly susceptible to Bt toxins and the S1905 strain is highly toxic. Therefore, the use of Bt strains may be a tool to be incorporated into the integrated management of this important pest.
    Źródło:
    Journal of Plant Protection Research; 2018, 58, 1
    1427-4345
    Pojawia się w:
    Journal of Plant Protection Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Radiation-induced cancer risk and decision-making in a simulated Cs-137 urban event
    Autorzy:
    Andrade, Edson R.
    Gomes, Renato G.
    Stenders, Ricardo
    Brum, Tercio
    Lima, Sergio X.
    Castro, Mariana S. C.
    Silva, Ademir X.
    Powiązania:
    https://bibliotekanauki.pl/articles/146858.pdf
    Data publikacji:
    2020
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    environmental contamination
    dispersive device
    decision-making
    Opis:
    The triggering of a “dirty bomb” generates a complex scenario, with enormous challenges for the responders due to initial misinformation and the urgency to act quickly yet effectively. Normally, the first 100 h are decisive for perceiving the risk in a more realistic dimension, but the support of methodologies that rely on computational simulations can be valuable when making key decisions. This work seeks to provide support for the early decision-making process by using a Gaussian model for the distribution of a quantity of Cs-137 spread by a radiological dispersive device (RDD). By sequentially joining two independent programs, HotSpot Health Physics codes and RESidual RADiation (RESRAD)-RDD family of codes, we came up with results that suggest a segmented approach to the potentially affected population. These results advocate that (a) the atmospheric stability conditions represented by the Pasquill–Gifford classes and (b) the population subgroups defi ned by radiation exposure conditions strongly influence the postdetonation radiological effects. These variables should be taken into account in the elaboration of flexible strategies that include many climatic conditions and to prioritize attention to different groups of public at risk. During the initial phases of such an event, it is believed that simulations using Gaussian models may be of value in anticipating the possible changes in key variables during the decision-making process. These variables may severely affect the effectiveness of the actions of responders and the general public’s safety.
    Źródło:
    Nukleonika; 2020, 65, 1; 37-43
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Antifungal activity of Solanum extracts against phytopathogenic Curvularia lunata
    Autorzy:
    Hernandez-Rodriguez, Z.G.
    Riley-Saldana, C.A.
    Gonzalez-Esquinca, A.R.
    Castro-Moreno, M.
    de-la-Cruz-Chacon, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/66701.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    phytopathogenic fungi
    Curvularia lunata
    antifungal activity
    Solanum
    plant extract
    plant disease
    disease control
    leaf spot disease
    phytopathogen
    inhibition
    Opis:
    Several species of Solanum produce secondary metabolites with antimicrobial activity. In the present study, the inhibitory activity of Solanum chrysotrichum, S. erianthum, S. torvum and S. rostratum against phytopathogenic Curvularia lunata was determined. Methanol extracts from roots, stems, leaves and fruits were evaluated by the method of mycelial inhibition on agar and the minimum inhibitory concentration (MIC) was determined on a liquid medium. To increase the antimicrobial activity, the combined activity of the most active extracts for each phytopathogen was also determined (a combination of intra and interspecies extracts). The results showed that 12 of the 16 methanolic extracts of Solanum species had antifungal effects against C. lunata. The extracts of S. rostratum and S. erianthum developed the highest activity (~80% inhibition and 28.4 MIC μg . ml–1), even, equal to or greater than, the reference fungicide. The mixture of the active extracts of S. chrysotrichum and S. torvum increased their activity. Various extracts affected the macro and microscopic morphology and most of them reduced the number of conidia of the fungus. This resulted in the capacity to control the vegetative growth and reproduction of C. lunata, the causal fungus of corn leaf spot disease.
    Źródło:
    Journal of Plant Protection Research; 2018, 58, 3
    1427-4345
    Pojawia się w:
    Journal of Plant Protection Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    New concrete additive by chemical recycling of PET
    Autorzy:
    Mendivil-Escalante, J M
    Almaral-Sánchez, J L
    Gómez-Soberón, J M
    Arredondo-Rea, S P
    Corral-Higuera, R
    Castro-Beltrán, A
    Cabrera-Covarrubias, F G
    Powiązania:
    https://bibliotekanauki.pl/articles/102237.pdf
    Data publikacji:
    2014
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    concrete admixture
    glycolysis
    polymeric resins
    polyethylene terephthalate
    Opis:
    Due to the problem that represents the accelerated production of waste from the consumption of polyethylene terephthalate (PET), it becomes necessary to look for alternative solutions; chemical recycling is a suitable method for conversion into a material with potential application in concrete additive, such as unsaturated polyester resins; with the above improvements and conservation of non-renewable raw materials can reduce the environmental impact. This investigation was focused on obtaining the synthesis of a polymeric resin by the method of glycolysis, and their characterization by Infrared Spectroscopy (FT-IR); the results show that the recycled materials (PET and its processing) are similar to reagents made from primary materials so that it is considered feasible to use in the intended application.
    Źródło:
    Advances in Science and Technology. Research Journal; 2014, 8, 23; 1-5
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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