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Wyświetlanie 1-10 z 64
Tytuł:
Naphthalic anhydride increases tolerance of common bean to herbicides
Autorzy:
Krenchinski, F.H.
Batista de Castro, E.
Cesto, V.J.S.
Belapart, D.
Rodrigues, D.M.
Carbonari, C.A.
Velini, E.D.
Tematy:
electron transport
Phaseolus vulgaris
protection
safeners
Pokaż więcej
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:
https://bibliotekanauki.pl/articles/2084688.pdf  Link otwiera się w nowym oknie
Opis:
The aim of this work was to evaluate the use of the naphthalic anhydride safener on the protection of common bean cultivars BRS-Estilo (carioca) and BRS-Esplendor (black) from negative effects of herbicides. Two experiments were conducted, one for each cultivar in a complete randomized design with five replications, in a 6 × 3 factorial scheme, with six herbicide treatments: bentazon, fluazifop-P + fomesafen, bentazon + imazamox, fomesafen, cloransulam, and control without application, and three naphthalic anhydride treatments: without application, foliar application, and application via seed treatment. Visible injuries at 7, 14 and 21 days after application, photosystem II electron transport rate, and plant dry weight were evaluated. The naphthalic anhydride applied via foliar, and seed treatment reduced significantly the visible injuries in relation to the control when using the herbicides bentazon, fluazifop-P + fomesafen, bentazon + imazamox, and cloransulam. The photosystem II electron transport rate was protected by anhydride applied via foliar and seed treatment when using the herbicides bentazon, fluazifop-P + fomesafen and bentazon + + imazamox. The application of naphthalic anhydride via seed treatment protected the BRS-Estilo and BRS-Esplendor common bean cultivars, with no reductions in the plant dry weight when using the herbicides fluazifop-P + fomesafen, and fomesafen. The use of naphthalic anhydride via seed treatment and foliar application protected BRS-Estilo and BRSEsplendor common bean cultivars, from the negative effects of fluazifop-P + fomesafen and fomesafen herbicides. Thus, this practice has potential to be used in common beans.
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.
Tematy:
2,2-bipirydyna
żel krzemionkowy
adsorpcja
jony metali
2,2'-bipyridine
silica gel
adsorption
metal ions
Pokaż więcej
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Powiązania:
https://bibliotekanauki.pl/articles/779827.pdf  Link otwiera się w nowym oknie
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.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
In vitro and in vivo activity of a new unsymmetrical dinuclear copper complex containing a derivative ligand of 1,4,7-triazacyclononane : catalytic promiscuity of $[Cu_{2}(L)Cl_{3}]$
Autorzy:
Haase, Wolfgang
Neves, Ademir
Schilling, Eduardo L.
Osório, Renata E. H. M. B.
Vilhena, Felipe
Szpoganicz, Bruno
Almeida, Vicente R. de
Bessa, Luiza M.
Pereira, Marcos D.
Bortoluzzi, Adailton J.
Xavier, Fernando R.
Bortolotto, Tiago
Alves, Odivaldo C.
Eleutherio, Elis C. A.
Tomkowicz, Zbigniew
Cavalett, Angelica
Terenzi, Hernán
Castro, Frederico A. V.
Costa, Thiago G.
Opis:
Here we present the synthesis of the dinuclear complex $[Cu_{2}^{II}(L)Cl_{3}]$ (1), where L is the deprotonated form of the 3-[(4,7-diisopropyl-1,4,7-triazacyclononan-1-yl)methyl]-2-hydroxy-5-methylbenzaldehyde ligand. The complex was characterized by single crystal X-ray diffraction, potentiometric titration, mass spectrometry, electrochemical and magnetic measurements, EPR, UV-Vis and IR. Complex 1 is able to increase the hydrolysis rate of the diester bis-(2,4-dinitrophenyl)phosphate (2,4-BDNPP) by a factor of 2700, and also to promote the plasmidial DNA cleavage at pH 6 and to inhibit the formazan chromophore formation in redox processes at pH 7. Using Saccharomyces cerevisiae (BY4741) as a eukaryotic cellular model, we observed that 1 presents reduced cytotoxicity. In addition, treatment of wild-type and mutant cells lacking Cu/Zn-superoxide dismutase (Sod1) and cytoplasmic catalase (Ctt1) with 1 promotes increased survival after $H_{2}O_{2}$ or menadione ($O_{2} ^{\cdot}$ -generator) stress, indicating that 1 might act as a Sod1 and Ctt1 mimetic. Considered together, these results support considerations regarding the dynamic behaviour of an unsymmetrical dinuclear copper(II) complex in solid state and in aqueous pH-dependent solution.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
An optical gamma-ray burst catalogue with measured redshift : I. Data release of 535 gamma-ray bursts and colour evolution
Autorzy:
Rossi, A.
Oates, S. R.
Orange, N. B.
Moriya, T. J.
Rinaldi, E.
Fraija, N.
Lopresti, C.
Jamal, W.
González, J. d. J. G.
Gendre, B.
Prochaska, X.
Levine, D.
Kumar, R.
Rosi, P.
Castro-Tirado, A. J.
Becerra, R. L.
Conti, M.
Pozanenko, A.
Das, U.
Richer, M.
Strabla, L.
Butler, N. R.
Saha, N.
Misra, K.
Niino, Y.
do E. S. Pedreira, A. C. C.
Kido, D.
Watson, A. M.
Volnova, A.
Kutyrev, A. S.
Ramirez, L. M. T.
Zoła, Stanisław
Lee, W. H.
Quadri, U.
Ruocco, N.
Li, L.
Dainotti, M. G.
Desai, S.
Pasumarti, V.
Siegel, M. H.
Kalinowski, K. K.
Lambiase, G.
De Simone, B.
Leonini, S.
Chan, L.
Hu, Y -D.
Jindal, I.
Cenko, S. B.
Fuentes, M.
Ramirez-Ruiz, E.
Belkin, S.
Mohideen Malik, R. F.
Opis:
We present the largest optical photometry compilation of gamma-ray bursts (GRBs) with redshifts (z). We include 64813 observations of 535 events (including upper limits) from 28 February 1997 to 18 August 2023. We also present a user-friendly web tool grbLC which allows users to visualize photometry, coordinates, redshift, host galaxy extinction, and spectral indices for each event in our database. Furthermore, we have added a Gamma-ray Coordinate Network (GCN) scraper that can be used to collect data by gathering magnitudes from the GCNs. The web tool also includes a package for uniformly investigating colour evolution. We compute the optical spectral indices for 138 GRBs, for which we have at least four filters at the same epoch in our sample, and craft a procedure to distinguish between GRBs with and without colour evolution. By providing a uniform format and repository for the optical catalogue, this web-based archive is the first step towards unifying several community efforts to gather the photometric information for all GRBs with known redshifts. This catalogue will enable population studies by providing light curves (LCs) with better coverage since we have gathered data from different ground-based locations. Consequently, these LCs can be used to train future LC reconstructions for an extended inference of the redshift. The data gathering also allows us to fill some of the orbital gaps from Swift in crucial points of the LCs, e.g. at the end of the plateau emission or where a jet break is identified.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Wyświetlanie 1-10 z 64

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