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Effect of Zinc Oxide Nanocrystals in Media Containing E. coli and C. xerosis Bacteria

  • Triana Merced (a1), Stephanie Santos (a1), Omayra Rivera (a1), Nicole Villalba (a1), Yahira Baez (a1), José Gaudier (a1), Javier Avalos (a1), Oscar Perales (a2), M. S. Tomar (a2), A. Parra-Palomino (a2) and Javier Avalos (a3)...

Abstract

The present investigation is centered on the study of the growth curves of E. coli and C. xerosis bacteria in the presence of nanosize particles of Zinc Oxide. Previous works demonstrated the sensitivity of the bacteria, when these were reproduced in media that contain nanoparticles of luminescent silicon and Cobalt Ferrite. Doped ZnO nanocrystals were synthesized by conventional precipitation in ethanol solutions as reported by Spanhel and Anderson for bare ZnO. In our case, the syntheses were carried out under room-temperature conditions.

The experimental results of E. coli bacteria in contact with a stable suspension of nanoparticles of Zinc Oxide, shows a growth curve without adaptation period. Moreover a short and slowly logarithmic stage has been observed, reaching the stationary stage after approximately four hours compared with one in absence of the nanoparticles (standard curve). During the observations, a change in the lifetime of the bacteria (metabolism) with particulate was noticed,as well as the beginning of the mortality stage. However, different results were recorded for silicon and ferrite. For the case of the bacteria C. xerosis, the curve with particles is above its standard curve, for all times with none of the oscillations which occured in the nanometer silicon. For these bacteria the beginning of the mortality stage is observed when they have particles. For both bacteria with Zinc Oxide nanoparticles this occurs approximately after nine hours.

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1. Pérez, Lilyana, Flores, Marjorie, Avalos, J., Miguel, L. San, Fonseca, L., and Resto, O. ‘Comparative Study of the Growth Curves of B.subtilis, K. pneumoniae, C. xerosis and E. coli Bacteria I medium Containing Nanometric Silicon Particles’, Mat. Res. Soc. Symp. Proc. Vol 737, Materials Research Society, 2003
2. Flores, Marjorie, Colón, Nanell, Rivera, Omayra, Villalba, Nicole, Baez, Yahira, Quispitupa, D., Avalos, J., Perales, O. ‘A study of the growth curves of C. xerosis and E. coli Bacteria in Mediums Containing Cobalt Ferrite Nanoparticles’, Mat. Res. Soc. Symp. Proc. Vol.820 Materials Research Society © 2004
3. Sphanel, L. And Anderson, M.A, ‘Semiconductor clusters in the sol-gel process: quantized aggregation, gelation and crystal growth in concentrated zinc oxide colloids’ J. Am. Chem. Soc., 113, 2826–2833
4. Jeyadevan, B., Perales-Perez, O., Chinasammy, C. N., Shinoda, K., Tohji, K. and Kasuya.‘ Auxiliary Aqueous Solution Processes for the Synthesis of Cobalt Ferrite with High Coercivity at Room Temperature’. J. Jap. Soc. Powd. Metall., 50, 114 (2003).
5. Chinnasamy, C.N., Senoue, M., Jeyadevan, B., Perales-Perez, Oscar, Shinoda, K., and Tohji., K.Synthesis of size-controlled CoFe2O4 particles with high coercivity and squareness ratio’. J. Coll. Interf. Sci. 263, 83 (2003)

Keywords

Effect of Zinc Oxide Nanocrystals in Media Containing E. coli and C. xerosis Bacteria

  • Triana Merced (a1), Stephanie Santos (a1), Omayra Rivera (a1), Nicole Villalba (a1), Yahira Baez (a1), José Gaudier (a1), Javier Avalos (a1), Oscar Perales (a2), M. S. Tomar (a2), A. Parra-Palomino (a2) and Javier Avalos (a3)...

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