FERNANDO BACCI EFFENBERGER

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Enhancing Rhizobium performance in common bean plants through Fe3O4 nanoparticles
2024 - MASUNAGA, SUELI H.; SOUZA-TORRES, ANGEL de; GOVEA-ALCAIDE, ERNESTO; GOMES-PADILLA, ERNESTO; EFFENBERGER, FERNANDO B.; ROSSI, LIANE M.; LOPEZ-SANCHEZ, RAUL; JARDIM, RENATO de F.
This study investigates the effects of Fe3O4 nanoparticles (NPs) on nodulation, nitrogen fixation, and growth of common bean plants. Plants were exposed to Fe3O4 NPs, Rhizobium inoculation, and Fe3O4 NPs + Rhizobium inoculation. Results showed that treated plants exhibited improved symbiotic performance, with increased nitrogenase activity, nodule leghaemoglobin, and iron content. Additionally, the number of active nodules per plant and nodule dry weight significantly increased. Symbiotic nitrogen fixation was enhanced, leading to higher shoot and root total nitrogen content. Treatment combining Fe3O4 NPs and Rhizobium inoculation yielded the best results. Fe3O4 NPs were taken up by plants, accumulating in organs including nodules. Moreover, treated plants displayed increased root and shoot lengths, leaf area, and dry weights. Magnetization curves indicated the accumulation of Fe3O4 NPs in nodules, enhancing symbiotic performance. The study suggests a novel strategy for improving common bean growth through Fe3O4 NPs and Rhizobium inoculation, offering potential benefits for sustainable agriculture, and reducing nitrogen fertilizer use. These findings contribute to a non-genetic approach in legume research, emphasizing long-term improvements in common bean growth and symbiosis [1-2].
Impacts of Rhizobium inoculation and Fe3O4 nanoparticles on common beans plants
2024 - GOVEA-ALCAIDE, E.; DESOUZA, A.; GOMEZ-PADILLA, E.; MASUNAGA, S.H.; EFFENBERGER, F.B.; ROSSI, L.M.; LOPEZ-SANCHEZ, R.; JARDIM, R.F.
We have carried out a systematic investigation on the impact of Fe3O4 nanoparticles (NPs) and Rhizobium inoculation on nodulation and growth of common bean plants (cv. Red Guama, Phaseolus vulgaris). Three distinct treatments were conducted on the common bean plants: (i) exposure to Fe3O4 NPs; (ii) Rhizobium inoculation; and (iii) a combined treatment involving Fe3O4 NPs + Rhizobium inoculation, with non-treated plants as controls. Temperature and magnetic field dependence of magnetization, M(T, H), measurements were performed on both the soil, and dried organs of the plants including roots, nodules, stems, and leaves. M(T, H) analyses indicated a systematic increase in magnetization across organs of plants treated with Fe3O4 NPs and combined Fe3O4 NPs + Rhizobium. We have found the magnetic contribution, generally related to Fe content in the soil and plant organs, significantly increased in plants exposed to Fe3O4 NPs, further indicating absorption, translocation, and accumulation of Fe3O4 NPs in the areal parts of the plants. Plants treated with Fe3O4 NPs and combined Fe3O4 NPs + Rhizobium exhibited Fe3O4 NPs accumulation in all organs with increasing concentrations of 69.7 to 74.1 NNPs/g in roots, 5.6 to 7.7 NNPs/g in stems, and 3.1 to 5.5 NNPs/g in leaves, respectively. The iron concentration in nodules was found to be close to 65 NNPs/g. No appreciable difference in the absorption index AI of roots between plants treated with Fe3O4 NPs (~ 1.73%) and Fe3O4 NPs + Rhizobium (~ 1.79%) has been observed. The translocation index TI increased by ~ 46% in plants treated with Fe3O4 NPs + Rhizobium (6.9%) compared to Fe3O4 NPs (4.3%). Treated plants showed improved symbiotic performance including nodule leghaemoglobin and iron content, number of active nodules per plant, and nodule dry weight. The best result was obtained using the combined treatment of Fe3O4 NPs + Rhizobium. This study provides evidence that M(T,H) measurements constitute a valuable tool in monitoring the uptake, translocation, and accumulation of Fe3O4 NPs in plant organs of common bean plants.
Crystalline and magnetic properties of CoO nanoparticles locally investigated by using radioactive indium tracer
2021 - SANTOS, RENATA V.; CABRERA-PASCA, GABRIEL A.; COSTA, CLEIDILANE S.; BOSCH-SANTOS, BRIANNA; OTUBO, LARISSA; PEREIRA, LUCIANO F.D.; CORREA, BRUNO S.; EFFENBERGER, FERNANDO B.; BURIMOVA, ANASTASIA; FREITAS, RAFAEL S.; CARBONARI, ARTUR W.
We herein report a comprehensive investigation on the magnetic, structural, and electric properties of CoO nanoparticles with different sizes by local inspection through hyperfine interactions measured in a wide range of temperatures (10–670 K) by using radioactive 111In(111Cd) tracers with the perturbed angular correlations technique. Small cobalt oxide nanoparticles with the characteristic size of 6.5 nm have been prepared by the wet chemical route that turned out to be essential to incorporate radioactivity tracers during nucleation and growth of the particles. Nanocrystalline samples with 22.1 nm size were obtained by thermal treatments under low pressure of helium at 670 K. The hyperfine data were correlated with X-ray diffraction, ZFC–FC magnetic measurements, and transmission electron microscopy to describe the structure, magnetic properties, size, and shape of samples. An analysis of the temperature evolution of hyperfine parameters revealed that the structural distortion and the magnetic disorder in the core and on the surface layer play an important role in the magnetic behavior of CoO nanoparticles.
Investigation of magnetic and structural properties of CoFe2O4 nanoparticles by measuring hyperfine interactions with 111Cd
2019 - MATOS, I.T.; NASCIMENTO, N.M.; CABRERA-PASCA, G.A.; EFFENBERGER, F.B.; FREITAS, R.S.; CARBONARI, A.W.
Because their ability of magnetic nanoparticles (MNP) to become magnetized when exposed to an external magnetic field, which make them good candidates for biomedical applications [1]. The investigation of the magnetic and structural properties by techniques with atomic resolution, such as those based on hyperfine interactions, is, therefore, greatly useful in the study of MNP. In this work, hyperfine interactions in nanoparticles of CoFe2O4 were investigated by perturbed γ-γ angular correlation (PAC) spectroscopy using 111Cd as probe nuclei in the temperature range from 50 K to 850 K. Samples of CoFe2O4 were prepared by thermal decomposition [2]. Magnetic measurements results show a blocking temperature of 210 K and a superparamagnetic behavior at 300 K. MET measurements show that particles present well-monodispersed spherical shape with average size of 7 nm. XRD results show that samples crystallize in a single phase with the expected spinel structure. PAC spectra were fitted by a model considering two site fractions occupied by the probe nuclei. One were characterized by a single well-defined Larmor frequency with site fraction population of 47%, which was assigned to probe nuclei substituting cation sites in the core region of the particles. The other was characterized by a broad distribution quadrupole frequency with population of 53% corresponding to probe nuclei at distorted cation sites in the shell region of the particles. This assignment agrees with an expected shell/core volume ratio for particles with a diameter of 7 nm. Hyperfine measurements also show that the magnetic hyperfine field (Bhf) is 12.6 T at 10 K in the saturated region and the temperature dependence of Bhf indicate that the transition temperature is around 900 K.
Síntese de nanopartículas de óxido de ferro utilizando óleo de ucuúba
2015 - CORREA, BRUNO S.; SILVA, ANA P.S.; CORDEIRO, RENATO M.; MATOS, IZABELA T.; CORREA, EDUARDO L.; EFFENBERGER, FERNANDO B.; SENA, CLEIDILANE; CARVALHO JUNIOR, RAUL N.; SAIKI, MITIKO; CARBONARI, ARTUR W.
Sintese e caracterização de nanopartículas magnéticas de Fesub(2)Osub(4) recobertas com óleo de açai para aplicações biomédicas
2015 - SILVA, ANA P.S.; CORREA, BRUNO S.; BATISTA, CAMILA R.; PINTO, RAFAEL H.H.; CORDEIRO, RENATO M.; MATOS, IZABELA T.; EFFENBERGER, FERNANDO B.; JUNIOR, RAUL N.C.; SAIKI, MITIKO; SENA, CLEIDILANE; CARBONARI, ARTUR W.