Browsing by Autor "Danitza Xiomara Romero"

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Detection of ALS3 and EAP1 gene expresssion in Candida albicans and Candida maltosa biofilms by FISH
(2016) Danitza Xiomara Romero; Oscar Víctor Cárdenas; María Teresa Álvarez
Biofilm is regarded as universal forms of microorganism life in aquatic and industrial wastewater systems as well as in a large number of environments and medical devices relevant for public health, where the exact mechanisms by which biofilm-associated microorganisms elicit infection diseases are still poorly understood. Candida biofilm formation is regulated by different mechanisms where adhesins play a clue role in the yeast attachment to certain surfaces. These adhesins are encoding by ALS3, HWP1 and EAP1 genes among others and they are also considered as Candida virulence factors. Methodologies use to study biofilm productions are intended to verify the biofilm composition, formation steps, tridimensional structure and might facilitate the monitoring of biofilm regarding, antibiotic resistance, degradations, inhibitors, enhanciement biofilm formation and other features. Here, FISH expression a modified method to detect gene expression in situ was used in order to detect ALS3, HWP1 and EAP1 in C. albicans and C. maltosa biofilms, constituting a useful tool to monitor biofilm formations. In this regard, ALS3 expression was identified in C. albicans and C. maltosa biofilms.
Detection of luxS gene expression under stressing factors for biofilm formation by Propionibacterium acidipropionici and Propionibacterium freudenreichii
(2015) Danitza Xiomara Romero; Oscar Víctor Cárdenas Alegría; Víctor Hugo Cavero Olguin; María Teresa Álvarez Aliaga
Gene expression constitutes an important role in cellular communication, setting mechanisms for biofilm formation. Genes can be used as molecular markers to monitor viability, stability and maintenance of biofilm eg. in biofilm reactors, bioremediation and biotransformation frequently under stressing conditions to enhance or limit the biofilm formation. In the present study, no pathogenic microorganisms of industrial interest were used. Propionibacterium freudenreichiisubsp. shermanii DSM 4902T and P. acidipropionici DSM 4900Tstrains cannot produce biofilm in culture conditions previously reported. In this regard, chemical culture conditions were modified to stimulate biofilm formation in both strains and determine that under stressing conditions such as 0.6 M NaCl, 1.8 M glucose and 10 gL-1 yeast extract both Propionibacterium produce biofilm. Finally, luxS expression was identified in biofilm of both strains by modified fluorescent in situ hybridization expression (FISH expression).
Susceptibilidad in vitro de promastigotes de Leishmania frente a Anfotericina B, Miltefosina y los Alcaloides Totales de Galipea longiflora mediante el Método Colorimétrico XTT-PMS
(2015) Efraín Salamanca; Danitza Xiomara Romero; José A Santalla; P Oporto; Ninoska Flores; Alberto Giménez Turba