Navegação Ciências Exatas e da Terra por Autor "Dias, Johnny Ferraz"

Resultados 21-30 de 30

    • Nutritional composition of Eragrostis teff and its association with the observed antimutagenic effects 

      Goersch, Maria Clara; Schäfer, Laura; Tonial, Marina; Oliveira, Viviani Ruffo de; Ferraz, Alexandre de Barros Falcão; Fachini, Jean; Silva, Juliana Bondan da; Niekraszewicz, Liana Appel Boufleur; Rodrigues, Carlos Eduardo; Pasquali, Giancarlo; Dias, Johnny Ferraz; Kist, Tarso Benigno Ledur; Picada, Jaqueline Nascimento (2019) [Artigo de periódico]
      Eragrostis teff is an Ethiopian native grass plant ( Poaceae or Gramineae family) whose importance as a crop grain has increased in recent years. The aim of this study is to analyze the nutritional composition of its seeds ...

    • Random and channeling stopping powers of He and Li ions in Si 

      Azevedo, Gustavo de Medeiros; Behar, Moni; Dias, Johnny Ferraz; Grande, Pedro Luis; Silva, Douglas Langie da; Schiwietz, Gregor (2002) [Artigo de periódico]
      In this work we have measured the electronic stopping powers of ⁴He and ⁷Li ions for channeling and random directions in Si as a function of the incident ion energy. The channeling (‹100› for Li, ‹110› and ‹111› for Li and ...

    • Role of ferritin in the rice tolerance to iron overload 

      Silveira, Vivian Chagas da; Fadanelli, Cristina; Sperotto, Raul Antonio; Stein, Ricardo José; Basso, Luiz Augusto; Santos, Diogenes Santiago; Vaz Junior, Itabajara da Silva; Dias, Johnny Ferraz; Fett, Janette Palma (2009) [Artigo de periódico]
      Deficiência de ferro (Fe) ocorre freqüentemente em plantas, uma vez que este mineral é pouco disponível em condições aeróbicas. Plantas de arroz cultivadas sob alagamento, no entanto, estão sujeitas ao excesso de Fe, que ...

    • Signature of plasmon excitations in the stopping ratio of fast hydrogen clusters 

      Shubeita, Samir de Morais; Sortica, Maurício de Albuquerque; Grande, Pedro Luis; Dias, Johnny Ferraz; Arista, Nestor (2008) [Artigo de periódico]
      In the present work, we have explored the interference effects which arise when H2 + and H3 + cluster ions interact with a thin layer of SiO2 in order to obtain a clear signature of plasmon excitations induced by these ...

    • Structural characterization of CdSe/ZnS quantum dots using medium energy ion scattering 

      Sortica, Maurício de Albuquerque; Grande, Pedro Luis; Radtke, Claudio; Almeida, Lais Gomes de; Debastiani, Rafaela; Dias, Johnny Ferraz; Hentz, Andre (2012) [Artigo de periódico]
      In the present work, we have analyzed CdSe/ZnS core-shell quantum dots by medium energy ion scattering (MEIS), which is a powerful technique to explore the synthesis, formation, stability, and elemental distribution of ...

    • Surface water impacted by rural activities induces genetic toxicity related to recombinagenic events in vivo 

      Soares Neto, José Lopes; De Carli, Raíne Fogliati; Kotzal, Queila Susana Gambim; Latroni, Francine Bolico; Lehmann, Maurício; Dias, Johnny Ferraz; Souza, Cláudia Telles de; Niekraszewicz, Liana Appel Boufleur; Silva, Fernanda Rabaioli da; Silva, Juliana da; Dihl, Rafael Rodrigues (2016) [Artigo de periódico]
      This investigation assessed the interaction of surface water samples with DNA to quantitatively and qualitatively characterize their mutagenic and/or recombinagenic activity. Samples were obtained at three different sites ...

    • Systems chemo-biology analysis of DNA damage response and cell cycle effects induced by coal exposure 

      Torres Avila, Jose Fernando; Espitia-Pérez, Lyda; Bonatto, Diego; Silva, Fernanda Rabaioli da; Oliveira, Iuri Marques de; Silva, Luis Felipe Oliveira; Correa, Dione Silva; Dias, Johnny Ferraz; Silva, Juliana da; Henriques, João Antonio Pêgas (2020) [Artigo de periódico]
      Cell cycle alterations are among the principle hallmarks of cancer. Consequently, the study of cell cycle regulators has emerged as an important topic in cancer research, particularly in relation to environmental exposure. ...

    • The potentialities of ultrasound as an alternative to chemical etching for proton beam writing micropatterning 

      Bauer, Deiverti de Vila; Debastiani, Rafaela; Souza, Cláudia Telles de; Amaral, Livio; Dias, Johnny Ferraz (2022) [Artigo de periódico]
      In this paper, we explore the potentialities of using ultrasound waves as a post-irradiation treatment after proton beam writing (PBW) patterning of PTFE. To that end, 2-mm-thick foils of PTFE were irradiated with 2.2 MeV ...

    • Triton angular distributions from the /sup 7/Li([gama],t)[gama] reaction near threshold 

      Likhachev, Vladmir P.; Martins, Marcos Nogueira; Cruz, Manoel Tiago Freitas da; Arruda-Neto, João Dias Toledo; Geraldo, L. Paulo; Semmler, Renato; Dias, Johnny Ferraz (1999) [Artigo de periódico]
      Angular distributions of tritons emitted in the reaction ⁷Li(y,t)α have been measured for two photon energy intervals (6.4–6.7 and 8.5–9.0 MeV), and θt between 30° and 150°. Monochromatic photons from neutron capture ...

    • Vicinage effect in the energy loss of H2 dimers : experiment and calculations based on time-dependent density-functional theory 

      Koval, Natalia; Borisov, Andrei G.; Rosa, Lucio Flavio dos Santos; Stori, Elis Moura; Dias, Johnny Ferraz; Grande, Pedro Luis; Sanchez-Portal, Daniel; Diez Muino, Ricardo (2017) [Artigo de periódico]
      We present a combined theoretical and experimental study of the energy loss of H2 + molecular ions interacting with thin oxide and carbon films.As a result of quantum mechanical interference of the target electrons, the ...