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Potential Prebiotic Relevance of Glycine Single Crystals enclosing Fluid Inclusions: An Experimental and Computer Simulation with Static Magnetic Fields

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Advances in Biological Chemistry 2020年第5期10卷 140-156页

作者： E. Angeles-Camacho J. Cruz-Castañeda A. Meléndez M. Colín-García K. Cervantes de la Cruz S. Ramos-Bernal A. negrón-Mendoza G. Garza-Ramos P. Rodríguez-Zamora C. Camargo-Raya A. Heredia Instituto de Ciencias nucleares Universidad Nacional Autónoma de México Mexico City México Facultad de Química Universidad Nacional Autónoma de México Ciudad Universitaria Mexico City México programa de Maestría y Doctorado en Ciencias Químicas UNAM. Cd. Universitaria Mexico City México Instituto de Geología Universidad Nacional Autónoma de México Mexico City México departamento de Física Coordinación de Ciencias de la Tierra Facultad de Ciencias Universidad Nacional Autónoma de México Mexico City México departamento de Bioquímica Facultad de Medicina Universidad Nacional Autónoma de México Mexico City México Instituto de Física-UnAM Circuito de la Investigación Científica Ciudad Universitaria Mexico City México

Glycine crystallizes into three different polymorphs called α, β and γ under standard physicochemical conditions. They have different features depending on their structural variations. The possible interaction of glycine with magnetic minerals in meteorites and comets or in the ancient Earth, paves the way to study the self-assembly and molecular behavior under irradiation and magnetic conditions. The magnetic field might induce the formation of a specific polymorph of glycine. To gain insight on the consequences of gamma irradiation with a gradient of static magnetic fields (0.06 T, 0.3 T, 0.42 T and 0.6 T) on the self-assembly of single macroscopic glycine crystals, we gamma irradiated the powdered amino acid and then assembled single crystals from water solutions. The preliminary results showed a stable formation of fluid inclusions in the single crystals and no straightforward effect on the self-assem- bly process after glycine gamma irradiation and interaction with static magnetic fields. The α glycine polymorph single crystals formed at 55° from the magnetic longitudinal axis and seemed to be enhanced by gamma radiation. n>The γ-glycine single crystals presented L and D circular dichroism signals,n>n style="font-family:Verdana;"

关键词： Glycine Polymorphs Fluid Inclusions Gamma Irradiation Chemical Evolution FT-IR Circular Dichroism Chiral Crystals

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Ocurrence of entomopathogenic Fungus from Flea Ctenocephalides canis(Siphonaptera:Pulicidae)

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Open Journal of Veterinary Medicine 2014年第12期4卷 281-285页

作者： Jonathan E.Ortega-Palomares Hector G.nunez-Palenius Ana M.Cruz-Avalos Aaron A.Hernandez-Rangel Roberto Lezama-Gutierrez Cesar A.Angel-Sahagun programa Educativo de medicina Veterinaria y Zootecnia Division Ciencias de la VidaUniversidad de GuanajuatoCampus Irapuato-SalamancaIrapuatoMexico departamento de Agronomía Division Ciencias de la VidaUniversidad de GuanajuatoCampus Irapuato-SalamancaIrapuatoMexico Instituto Tecnologico Superior de Irapuato AbasoloMexico Posgrado en Biosciencias Division Ciencias de la VidaUniversidad de GuanajuatoCampus Irapuato-SalamancaIrapuatoMexico Facultad de Ciencias Biologicas y Agropecuarias Universidad de ColimaColimaMexico

The objective of this study was to isolate entomopathogenic fungus from fleas (Ctenocephalides canis Curtis) collected from Cannis familiaris specimens. From 60 collected fleas, two dead insects presented white mycelia growth on the body surface, changing to a creamy color as time passed;the insects presented a mummified aspect, typical characteristic caused by entomopathogenic fungus. This fungus was identified as Beauveria bassiana (Balsamo-Crivelli) Vuillemin by their mycelia characteristics, macro- and micro-morphology. Up to our knowledge, this is the first report of entomopathogenic fungus isolated from adult C. canis fleas.

关键词： Ectoparasite Biological Control Dog Beauveria bassiana

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