Introduction: Enteroagregative Escherichia coli (EAEC) is a group of enteric pathogens that cause acute and persistent diarrhea among children, in patients infected with human immunodeficiency virus, which causes traveler's diarrhea and are associated with important outbreaks that have caused death. AIM: The aims of this study were to quantify and compare the bacterial load of stool samples from children under 2 years of age with and without diarrhea in a periurban community in Lima, Peru. Materials and methods: We randomly selected 165 stool samples (80 from diarrhea and 85 from asymptomatic patients) that previously were identified as EAEC for the presence of aggR plasmidic gene by Real Time-PCR for Diagnostic of Diarrheagenic E. coli (DEC) from bacteria isolated of stool culture, placebocontrolled trial conducted in children living in the district of Independencia, Lima, Peru. This st...

El objetivo de este trabajo de tesis es realizar el diseño de un módulo para la absorción de vibraciones mediante un amortiguador de masa sintonizado tipo péndulo (AMSP). Además, la tesis tiene como objetivo demostrar las mejoras de rendimiento obtenidas cuando se optimizan los parámetros del amortiguador de masa sintonizado (AMSP). El estudio considera el efecto de ajustar la frecuencia sintonizada del AMSP para obtener el rendimiento óptimo en la absorción de vibraciones cuando este se acopla a un sistema principal (estructura). El modelo optimizado considera los efectos de ajustar la relación de frecuencia, y la relación de masa del sistema combinado para reducir los niveles de vibración cuando el sistema principal está sujeta a una fuerza de excitación armónica. El diseño del módulo permite cambios en los parámetros físicos del AMSP, como es su longitud, lo que perm...

ABSTRACT TORCH infections are acquired during pregnancy and can cause abnormal fetal development. These infections include toxoplasmosis, rubella, cytomegalovirus (CMV), herpes simplex (HSV) and others. As part of clinical care in Peru, there is no routine testing for the TORCH infections listed above. As a part of the ZIP study, 350 pregnant women have been enrolled in their first or early second trimester from peri-urban communities in Iquitos, Peru. Blood samples have been collected at enrollment to test for syphilis, HIV and TORCH. We determined the seroprevalence of toxoplasmosis, CMV, rubella, and HSV in these women using a commercial ELISA for IgM. The mean age of the women enrolled was 26.2 ± 6.6 years, the gestational age at sample collection was 13.2 ± 3.4 weeks, and 31% were primigravida. Three (0.9%) sample was positive for syphilis and 4 (1.1%) for HIV. Twenty one (6%) sam...