Enhancement in the Photoluminescence Properties of SiO2:Ge Embedded in a Polymeric Matrix

 

• G. Lesly Jimenez
  Doctoral Program in Nanoscience’s and Nanotechnology, Center for Research and Advanced Studies of the National Polytechnic Institute, 2508 IPN Avenue, 07360 Mexico City, Mexico
• C. Falcony
  Department of Physics, Center for Research and Advanced Studies of the National Polytechnic Institute, 2508 IPN Avenue, 07360 Mexico City, Mexico
• C. Vazquez-Lopez
  Department of Physics, Center for Research and Advanced Studies of the National Polytechnic Institute, 2508 IPN Avenue, 07360 Mexico City, Mexico
• J. I. Golzarri
  Institute of Physics, National Autonomous University of Mexico (UNAM), 04520 Mexico City, Mexico
• G. Espinosa
  Institute of Physics, National Autonomous University of Mexico (UNAM), 04520 Mexico City, Mexico

DOI: https://doi.org/10.15415/jnp.2018.61022

Keywords: Photoluminescence, Polymer films, SBC, PTFE

Abstract

Polymer films of styrene butadiene copolymer (SBC) mixed with SiO₂:Ge powder were successfully obtained by the drop casting method. The SBC concentration (in chloroform solution) was 10%w/v and the SiO₂:Ge powder was mixed (mass ratio 80:20 respectively). The thicknesses of the films obtained were 50, 100, and 200 μm. In addition, polymer films of polytetrafluoroethylene (PTFE) preparation (60% dispersion in water), were obtained mixing 2 ml of PTFE and 0.05g of SiO₂:Ge powder with a mass relation of 98% polymer and 2% SiO₂:Ge. The photoluminescence emission spectra (PL) of SBC doped with SiO₂:Ge resulted in similar characteristics to those for SiO₂:Ge powders, although their intensity shows an increase 3.5 times approximately, compared with the pure powder. On the other hand, the PTFE films with SiO2:Ge present just one peak in the PL emission at 439 nm but their intensity increases 18 times respect to the powder. The photoluminescence excitation (PLE) spectra of the SiO₂:Ge powders show the characteristic peaks at 248 nm (most intense) and at 366 nm. However, when the powder is embedded either in SBC or PTFE the peak at 366 nm shows an important increase which seems to indicate an energy transfer from the polymer to the SiO₂:Ge.

 

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Issue

Vol 6 No 1 (2018) 

 

 

How to Cite

G. Lesly Jimenez; C. Falcony; C. Vazquez-Lopez; J. I. Golzarri; G. Espinosa. Enhancement in the Photoluminescence Properties of SiO2:Ge Embedded in a Polymeric Matrix. J. Nucl. Phy. Mat. Sci. Rad. A. 1, 6, 129-133.

 

Gamma Radiation Doses Effects on Mechanical Properties and Microwave Absorption Capacity of Rubber Doped Concrete

• J. Colín
  Molecular Biophysics Laboratory of the Faculty of Sciences, Autonomous University of Mexico State, Mexico
• F. Castillo
  Molecular Biophysical Modeling and Design Laboratory, Mexiquense University, S. C.
• J.C. Peralta-Abarca
  Molecular Biophysics Laboratory of the Faculty of Sciences, Autonomous University of Mexico State, Mexico
• B. Leal
  Multiscale Molecular Bioengineering Laboratory of the Faculty of Sciences, Autonomous University of Mexico State, Mexico
• O. Flores
  Molecular Biophysical Modeling and Design Laboratory, Mexiquense University, S. C.
• I. Gamboa
  Multiscale Molecular Bioengineering Laboratory of the Faculty of Sciences, Autonomous University of Mexico State, Mexico
• H. Martínez
  Molecular Biophysical Modeling and Design Laboratory, Mexiquense University, S. C.

DOI: https://doi.org/10.15415/jnp.2018.61021

Keywords: Concrete, waste tire rubber, ecological materials, mechanical properties, microwave absorption, gamma radiation

Abstract

The main raw material for the construction industry is concrete; whose fundamental components are the fine and coarse aggregates, water and cement. For the obtaining of these materials are necessary activities that generate environmental deterioration, since the aggregates are extracted from quarries or river banks and for each ton made of cement is emitted into the atmosphere a great lot of carbon dioxide. In this way, the present work is developed with the purpose of contributing to the research that can help the conservation of basic natural resources through the use of waste polymers such as waste tire rubber, in the production of concrete, hoping to reduce its harmful environmental impact. This work focuses on the one hand, in the study of the effects of the incorporation to the concrete, of different proportions of scratched rubber coming from waste tires, on its mechanical properties and on its capacity for microwaves absorption. On the other hand, it is also studied the effect of aging by applying different doses of gamma radiation on the before mentioned properties, seeking with this the possibility that it can be used in the construction industry either as structural material or as a coating. Replacements were made between 5% and 25% of rubber in order to do not significantly affecting the mechanical properties of the concrete. The results of the mechanical and microwave tests performed on the different samples with different gamma radiation doses were compared and it was found that open the possibility of research with great benefits such as the use of waste tires in the designing of concrete mixtures and the improvement of its properties. It is considered important to point out the economic benefit in the context of sustainable development, which involves solving the problem of environmental pollution caused by waste tires, to achieve the welfare of the population by improving their quality of life.

 

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Issue

Vol 6 No 1 (2018) 

 

How to Cite

J. Colín; F. Castillo; J.C. Peralta-Abarca; B. Leal; O. Flores; I. Gamboa; H. Martínez. Gamma Radiation Doses Effects on Mechanical Properties and Microwave Absorption Capacity of Rubber Doped Concrete. J. Nucl. Phy. Mat. Sci. Rad. A. 2018, 6, 121-128.

 

In Silico Analysis of the Structural Properties of PSMA and its Energetic Relationship with Zn as Cofactor

 

• M.A. Fuentes
  Molecular Biophysics Laboratory of the Faculty of Sciences, Autonomous University of Mexico State, Mexico
• L. A. Mandujano
  Molecular Biophysical Modeling and Design Laboratory, Mexiquense University, S. C.
• R. López Multiscale
  Molecular Bioengineering Laboratory of the Faculty of Sciences, Autonomous University of Mexico State, Mexico
• L.R. Guarneros
  Multiscale Molecular Bioengineering Laboratory of the Faculty of Sciences, Autonomous University of Mexico State, Mexico
• E. Azorín Multiscale
  Molecular Bioengineering Laboratory of the Faculty of Sciences, Autonomous University of Mexico State, Mexico
• D. Osorio-González
  Molecular Biophysics Laboratory of the Faculty of Sciences, Autonomous University of Mexico State, Mexico

DOI: https://doi.org/10.15415/jnp.2018.61020

Keywords: PSMA structural analysis, PSMA with and without Zn as cofactor

Abstract

The prostate-specific membrane antigen (PSMA) is a 100 kDa type II transmembrane glycoprotein with enzymatic activity similar to the family of zinc-dependent exopeptidases. This protein is of great medical and pharmacological interest as overexpression in prostate cells is related to the progression of prostate cancer; therefore, it represents an important target for the design of radiopharmaceuticals. The presence of two Zn²⁺ ions in the active site is crucial to the enzymatic activity and the design of high-affinity inhibitors. The amino acid residues coordinating these ions are highly conserved in PSMA orthologs from plants to mammals, and site-mutagenesis assays of these residues show a loss of enzymatic function or reduction of the kinetic parameters. In the present work, we performed molecular dynamics simulation of PSMA with the purpose of characterizing it energetically and structurally. We elucidated the differences of PSMA with its two Zn⁺² ions as cofactors and without them in the free energy profile, and in four structural parameters: root mean square deviations and root mean square fluctuations by atom and amino acid residue, radius of gyration, and solvent accessible surface area.

 

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Issue

Vol 6 No 1 (2018) 

 

 

How to Cite

M.A. Fuentes; L. A. Mandujano; R. López; L.R. Guarneros; E. Azorín; D. Osorio-González. In SilicoAnalysis of the Structural Properties of PSMA and Its Energetic Relationship With Zn As Cofactor. J. Nucl. Phy. Mat. Sci. Rad. A. 2018, 6, 115-120.

 

In vitro Study of the Survival, Reproduction and Morphology of Daphnia pulicaria irradiated with a Low Energy Laser

 

• F. Zaldivar
  Molecular Biophysics Laboratory of the Faculty of Sciences, Autonomous University of Mexico State, Mexico
• J. Montoya
  Molecular Biophysics Laboratory of the Faculty of Sciences, Autonomous University of Mexico State, Mexico
• S. Gonzalez
  Molecular Biophysics Laboratory of the Faculty of Sciences, Autonomous University of Mexico State, Mexico
• L.A. Mandujano
  Molecular Biophysical Modeling and Design Laboratory, Mexiquense University, S. C
• J. F. Mendez-Sanchez
  Animal Ecophysiology Laboratory, Sciences Faculty, Autonomous University of Mexico State, Mexico
• L. Romero
  Laboratory of Nanothermodynamics and Complex Systems of the Faculty of Sciences, Autonomous University of Mexico State, Mexico
• J. Mulia
  Molecular Biophysics Laboratory of the Faculty of Sciences, Autonomous University of Mexico State, Mexico
• M. Paulin
  Academic Division of Basic Sciences, Juarez University Autonomous of Tabasco, Mexico
• D. Osorio-Gonzalez
  Molecular Biophysics Laboratory of the Faculty of Sciences, Autonomous University of Mexico State, Mexico
  
  DOI: https://doi.org/10.15415/jnp.2018.61019
  Keywords: Daphnia, laser irradiation, morphology

  Abstract

  Daphnia is a genus of crustaceans that is representative of freshwater communities. The species exhibit a high sensitivity to a wide range of toxic compounds so that they have been used internationally as biomonitors in toxicity tests to evaluate ecosystem conditions such as water quality. It is also a model genus in genetics, epigenetics and reproductive ecology. In this work, we used Daphnia pulicaria as a model to measure the effects of low-energy laser irradiation on survival, reproduction, and morphology variables of parental organisms and their offspring. We used (1) a single clone line of organisms to eliminate interindividual genetic variability; (2) individuals from more than 50 generations after the clone line was established, and offspring from the third brood onwards to dissipate maternal and epigenetic effects, and (3) neonates, those individuals of the species that have less than 48 hours of life, because they are the most sensitive stage to optical stimuli. We analyzed number of deaths, longevity, age at first reproduction, number of offspring per week, number of total offspring during all their life cycle, body size, size of the antennules, and length of the apical spine of the 4th and 5th brood of the irradiated individuals, who were exposed to a blue laser stimulus of 405 nm for 25 minutes with a power of 40 mW at a distance of 50 cm, compared to those of the control (non-irradiated) group.
  
  

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  Issue

  Vol 6 No 1 (2018) 

   

   

  How to Cite

  F. Zaldivar; J. Montoya; S. Gonzalez; L.A. Mandujano; J. F. Mendez-Sanchez; L. Romero; J. Mulia; M. Paulin; D. Osorio-Gonzalez. In Vitro Study of the Survival, Reproduction and Morphology of Daphnia Pulicaria Irradiated With a Low Energy Laser. J. Nucl. Phy. Mat. Sci. Rad. A. 2018, 6, 109-113.

   

   

   

Laser Radiation Effects on Adenine

 

• L.X. Hallado
  Institute of Physical Sciences, National Autonomous University of Mexico (UNAM). 1001 University avenue. 62210 Cuernavaca Morelos, Mexico
• J.C. Poveda
  Institute of Physical Sciences, National Autonomous University of Mexico (UNAM). 1001 University avenue. 62210 Cuernavaca Morelos, Mexico
• E. Prieto
  Institute of Physical Sciences, National Autonomous University of Mexico (UNAM). 1001 University avenue. 62210 Cuernavaca Morelos, Mexico
• A. Guerrero
  Institute of Physical Sciences, National Autonomous University of Mexico (UNAM). 1001 University avenue. 62210 Cuernavaca Morelos, Mexico
• I. Álvarez
  Institute of Physical Sciences, National Autonomous University of Mexico (UNAM). 1001 University avenue. 62210 Cuernavaca Morelos, Mexico
• C. Cisneros
  Institute of Physical Sciences, National Autonomous University of Mexico (UNAM). 1001 University avenue. 62210 Cuernavaca Morelos, Mexico

DOI: https://doi.org/10.15415/jnp.2018.61018

Keywords: photodissociation of adenine, gas phase adenine, multiphoton ionization spectroscopy

Abstract

Laser interaction with the gas phase nucleobase adenine is studied. A linear TOF mass spectrometer is utilized for measurements that require high mass resolution, high sensitivity, and sufficient ion yields of low mass fragment cations. The ion mass spectra are discussed at different laser energy intensities and two temperatures. In contrast to previous studies a number light ion is present in the mass spectra. The ion formation curves for 23 different ions are measured for the laser energy range from about 109 to 1010 W cm^–2 and masses between 1 and 43 besides mass 57 which was present in the mass spectra and will be discuss. Data were taken heating the sample at 235 C^o. The number of 355nm absorbed photons was calculated accordingly to Keldysh theory and similar results were found using adenine -Ar mixture. Our results are compared with those reported formed by protons, electrons or multiple charged ions interactions. Different ions were found indicating the possible effect of multiphoton absorption.

 

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Issue

Vol 6 No 1 (2018)

  

How to Cite

L.X. Hallado; J.C. Poveda; E. Prieto; A. Guerrero; I. Álvarez; C. Cisneros. Laser Radiation Effects on Adenine. J. Nucl. Phy. Mat. Sci. Rad. A. 2018, 6, 103-108.