Correlación entre plasmidos específicos y actividad de la endotoxina de bacillus, thuringiensis

Tesis (Maestría en Ciencias con Especialidad en Microbiología Industrial) UANL

Mecanismo de acción molecular de la endotoxina de Bacillus Thuringiensis

Tesis (Maestría en Ciencias con Especialidad en Microbiología) UANL

La delta endotoxina de Bacillus thuringiensis GM-2

Tesis (Maestría en Ciencias, con especialidad en Microbio logía). U.A.N.L. Facultad de Ciencias Biológicas

Desarrollo de un medio de cultivo a base de subproductos agroindustriales para la producción de delta-endotoxina de B. thuringiensis VAR. israelensis H-14 [por] Ma. Guadalupe Maldonado Blanco

Tesis (Maestría en Ciencias con Especialidad en Microbiología) U.A.N.L. Facultad de Ciencias Biológicas

Identificación de las regiones que determinan la especificidad de la d-endotoxina de Bacillus thuringiensis

Tesis (Doctorado en Ciencias con Especialidad en Microbiología) UANL

Ação in vitro do extrato glicólico de gengibre e medicamentos sobre Candida albicans, Enterococcus faecalis, Escherichia coli e sua endotoxina em canais radiculares

Pós-graduação em Odontologia Restauradora - ICT

Efeito de soluções irrigadoras e do hidróxido de cálcio como curativo de demora sobre o LPS-endotoxina. Estudo histopatológico em dentes de cães

Pós-graduação em Odontologia - FOAR

Avaliação in vitro da ação de substâncias químicas auxiliares e medicações intracanais sobre Escherichia coli e sua endotoxina em canais radiculares

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Avaliação ex vivo da expressão de TLR-2 e TLR-4 em leucócitos de equinos e sua relação com a tolerância à endotoxina

Pós-graduação em Ciência Animal - FMVA

Avaliação do efeito inflamatório da proteína galectina-1 nas células epiteliais pigmentadas da retina humana (ARPE-19) após ativação por endotoxina

Pós-graduação em Genética - IBILCE

Influência da endotoxina de E.coli, NwNLA e dexametasona sobre a responsabilidade vascular à angiotensina II

Pós-graduação em Biociências e Biotecnologia Aplicadas à Farmácia - FCFAR

Efeito anti-inflamatórios e mecanismo de ação da proteína anexina A1 em modelo de uveíte induzida por endotoxina

Pós-graduação em Genética - IBILCE

Avaliação histológica da resposta dos tecidos periapicais de dentes de macacos à endotoxina associada ao formocresol

Pós-graduação em Odontologia - FOAR

Avaliação in vitro da ação de substâncias químicas auxiliares, clorexidina e medicações intracanais sobre C. albicans, E. faecalis, E. coli e sua endotoxina em canais radiculares: [recurso eletrônico]

The purpose of this study was to evaluate the antimicrobial activity of chlorhexidine gel 2% as auxiliary chemical substance on the biomechanical preparation (BMP) and medication intracanal (ICM) on C. albicans, E. faecalis, E. coli and their endotoxin in root canals. We used 48 single-rooted human teeth divided into four groups according to dressing ICM: 1) Ca(OH)2 + pyrogen-free saline solution; 2) 2% chlorhexidine gel (CLX); 3) Ca(OH)2 + CLX, and; 4) pyrogen-free saline solution (control group). Were collected the contents of root canals to confirm the presence of microorganisms (confirmation), immediately after instrumentation (1st collection), after 7 days of the BMP (2nd collection), after 14 days of the action of ICM (3rd Collection) and 7 days after removal of the ICM (4 th collection). Were performed: the evaluation of antimicrobial activity and the content analysis of endotoxins for all sampling tests. The results were statistically analyzed using Kruskall-Wallis and Dunn tests with a significance of 5%. It was found that the CLX as auxiliary chemical substance has significantly reduced microorganisms confirmation collection when compared. In relation to the neutralization of endotoxin, it was found that the 1st and 2nd collections presented a decrease of 92.03% and 98.10% in mean percentage respectively, when compared to the confirmation collection. In the 3rd and 4th samplings, the Ca (OH)2 + CLX group showed the best results. It was concluded that the BMP and the ICM were able to eliminate the tested microrganisms, however, they were not able to completely eliminate endotoxins root canal

Recuperação e purificação do antígeno 503 de Leishmania i. chagasi expresso em E. coli e remoção de endotoxina utilizando adsorção em leito expandido

The growing interest and applications of biotechnology products have increased the development of new processes for recovery and purification of proteins. The expanded bed adsorption (EBA) has emerged as a promising technique for this purpose. It combines into one operation the steps of clarification, concentration and purification of the target molecule. Hence, the method reduces the time and the cost of operation. In this context, this thesis aim was to evaluate the recovery and purification of 503 antigen of Leishmania i. chagasi expressed in E. coli M15 and endotoxin removal by EBA. In the first step of this study, batch experiments were carried out using two experimental designs to define the optimal adsorption and elution conditions of 503 antigen onto Streamline chelating resin. For adsorption assays, using expanded bed, it was used a column of 2.6 cm in diameter by 30.0 cm in height coupled to a peristaltic pump. In the second step of study, the removal of endotoxin during antigen recovery process was evaluated employing the non-ionic surfactant Triton X-114 in the washing step ALE. In the third step, we sought developing a mathematical model able to predict the 503 antigen breakthrough curves in expanded mode. The experimental design results to adsorption showed the pH 8.0 and the NaCl concentration of 2.4 M as the optimum adsorption condition. In the second design, the only significant factor for elution was the concentration of imidazole, which was taken at 600 mM. The adsorption isotherm of the 503 antigen showed a good fit to the Langmuir model (R = 0.98) and values for qmax (maximum adsorption capacity) and Kd (equilibrium constant) estimated were 1.95 mg/g and 0.34 mg/mL, respectively. Purification tests directly from unclarified feedstock showed a recovery of 59.2% of the target protein and a purification factor of 6.0. The addition of the non-ionic surfactant Triton X-114 to the washing step of EBA led to high levels (> 99%) of LPS removal initially present in the samples for all conditions tested. The mathematical model obtained to describe the 503 antigen breakthrough curves in Streamline Chelanting resin in expanded mode showed a good fit for both parameter estimation and validation steps. The validated model was used to optimize the efficiencies, achieving maximum values of the process and of the column efficiencies of 89.2% and 75.9%, respectively. Therefore, EBA is an efficient alternative for the recovery of the target protein and removal of endotoxin from an E. coli unclarified feedstock in just one step.