Zobrazeno 1 - 10
of 254
pro vyhledávání: '"Marcelo Firmino"'
Autor:
Pedro Eduardo Costa, Altamiro Xavier de Souza, Gabriel Badagnani de Carvalho, Daniel Pasquini, Marcelo Firmino de Oliveira, Anízio Marcio de Faria, Cláudio Roberto Neri, Luis Carlos de Morais
Publikováno v:
Orbital: The Electronic Journal of Chemistry, Vol 16, Iss 2 (2024)
Low-cost lignocellulosic filters were made from soybean hulls (SH), sugarcane bagasse fibers (SBF), cellulose nanofibers (CNF), and Kraft-bleached pulp (BP) as renewable feedstocks and applied in Cu (II) and Cd (II) removal from aqueous medium. Filtr
Externí odkaz:
https://doaj.org/article/1533c0449a78496f8706bafb2483c15d
Autor:
Altamiro Xavier de Souza, Paulo Donato Frighetto, Gabriel Badagnani de Carvalho, Henrique de Castro Degiovani, Marcelo Firmino de Oliveira, Cláudio Roberto Neri, Vinícius Palaretti, Anizio Marcio de Faria, Daniel Pasquini, Luís Carlos de Morais
Publikováno v:
Orbital: The Electronic Journal of Chemistry, Vol 16, Iss 1 (2024)
In this work, the authors present as an innovation, the homogeneous sulfonation of Udel® polysulfone (PSU) with acetylsulfate (ACS) under reflux at 45°C in dichloromethane and inert N2 atmosphere (g) for 1.5 h. Different proportions of ACS were use
Externí odkaz:
https://doaj.org/article/aac03422241a4bb89dfc038bf4c33d06
Autor:
Alex Soares Castro, Larissa Silva de Azevedo, Caio Henrique Pinke Rodrigues, Ana Carolina Caleffi Patelli, Aline Thais Bruni, Marcelo Firmino de Oliveira
Publikováno v:
Talanta Open, Vol 5, Iss , Pp 100079- (2022)
The large number of drug seizures has required the development of electrochemical sensors and new analytical techniques involving portable sensors. Here, we have studied cocaine hydrochloride oxy-reduction on the surface of carbon paste electrodes ch
Externí odkaz:
https://doaj.org/article/7f1090c9161147418d0c308c41681bf6
Autor:
Juliana Midori Toia Katayama, Erica Naomi Oiye, Maria Fernanda Muzetti Ribeiro, Antônio José Ipólito, José Fernando de Andrade, Marcelo Firmino de Oliveira
Publikováno v:
Drug Analytical Research, Vol 4, Iss 1, Pp 3-11 (2020)
MDMA is the abbreviation for 3,4-methylenedioxymethamphetamine, which is commonly found in “ecstasy” pills. The psychoactive and euphoric effects that MDMA causes make this substance an illicit drug that is constantly seized by police forces. We
Externí odkaz:
https://doaj.org/article/98a30d5dfbcd47b593d07eb43c1f2c7a
Autor:
Bruno Ferreira, Leandro Oka Duarte, Érica Naomi Oiye, Maria Fernanda Muzetti Ribeiro, Juliana Midori Toia Katayama, Pedro Henrique Barros Oliva, Marcelo Firmino de Oliveira
Publikováno v:
Journal of Electrochemical Science and Engineering, Vol 10, Iss 4, Pp 361-371 (2020)
The consequences of consuming and commercializing illicit drugs including cocaine, constitute a serious problem for authorities and the whole society. Cocaine is usually identified in the laboratory conditions by chromatographic or spectroscopic me
Externí odkaz:
https://doaj.org/article/74b5290741734f52a02a4ba1b67f4afd
Autor:
Ayla Roberta Borges Serra, Thiago Rui Casagrande, Juliana Fonseca de Lima, Marcelo Firmino de Oliveira, Severino Alves Júnior, Marcos de Oliveira Junior, Osvaldo Antonio Serra
Publikováno v:
Sci, Vol 4, Iss 4, p 43 (2022)
Hydrogels based on mixed zirconium/europium ions and benzene tricarboxylic acid were synthesized by hydrothermal reaction. A solid glass-like material is formed upon drying, showing strong reddish luminescence. The system was characterized by solid-s
Externí odkaz:
https://doaj.org/article/a8ed581e278a49bcaf58980be180416c
Autor:
Érica N. Oiye, Maria Fernanda M. Ribeiro, Bruno Ferreira, Rodrigo C. B. Botelho, Marcelo Firmino De Oliveira
Publikováno v:
Brazilian Journal of Forensic Sciences, Medical Law and Bioethics, Vol 9, Iss 4 (2020)
Currently, marijuana or cannabis is the most consumed drug worldwide, and is also the one with the highest number of seizures, with 354 tons seized in Brazil in 2017. The increase in its consumption has been called attention, not only by the authorit
Externí odkaz:
https://doaj.org/article/7d0b0c4aacbc4963af26a2e57dc2c39d
Autor:
Maria Fernanda M. Ribeiro, Erica N. Oiye, Juliana M. T. Katayama, José W. C. Junior, Edward R. Dockal, Marcelo Firmino De Oliveira
Publikováno v:
Brazilian Journal of Forensic Sciences, Medical Law and Bioethics, Vol 9, Iss 4 (2020)
In recent years, practical, inexpensive, and highly specific electroanalytical methods based on modified electrodes have been increasingly developed for forensic science. Simple modification of the carbon paste electrode with Schiff base complexes ha
Externí odkaz:
https://doaj.org/article/f2ff63f720994725a7f3761dc9b1a0a1
Autor:
Marcelo Firmino de Oliveira, Jacqueline Querino Alves, José Fernando de Andrade, Adelir Aparecida Saczk, Leonardo Luiz Okumura
Publikováno v:
Eclética Química, Vol 34, Iss 3, Pp 77-83 (2018)
The HPLC technique with UV-Vis detection was employed in the analysis of cocaine content in apprehended samples of cocaine and crack. A peak signal for cocaine was obtained in 3.5 minutes run by using acetonitrile/water (95:5v/v) as a mobile phase. O
Externí odkaz:
https://doaj.org/article/a136790e450142bbb2f92f3d1845b4fd
Autor:
Adriano Cesar Pimenta, Valdir Roberto Balbo, Marcelo Firmino Oliveira, Fernando Grine Martins, Leandro Maranghetti Lourenço, José Fernando de Andrade
Publikováno v:
Orbital: The Electronic Journal of Chemistry, Vol 9, Iss 5, Pp 323-328 (2017)
The stepwise formation of iron(III)-azide complexes in water/THF medium has been investigated at 20.0 (± 0.1) °C and 1.00 mol L-1 ionic strength (NaClO4). By the indirect potentiometric method employed, using a glass electrode and under the conditi
Externí odkaz:
https://doaj.org/article/85efd15b57f14b0ba878048330041226