RESUMEN
Fresh fruits have been involved in transmission of foodborne pathogens. In the present work, five different batches of blueberries were used. One aliquot from each batch was washed with sterile saline solution (SSS) and the other one with a solution of the circular bacteriocin enterocin AS-48 in SSS. Then, the surface microbiota of controls and bacteriocin-treated samples was recovered and used for microbiota analyses, both using viable counts and high-throughput amplicon sequencing. Total aerobic mesophilic loads ranged from 2.70 to 4.09 log CFU/g in most of the samples. Only two samples yielded detectable viable counts on selective media (Enterobacteriaceae, presumptive Salmonella and coliforms), with values ranging from 2.84 to 3.81 log CFU/g. The bacteriocin treatment reduced viable cell counts of total aerobic mesophiles to a range of 1.40-1.88 log CFU/g. No viable cells were detected on selective media. Amplicon sequencing indicated large batch-to-batch variations in the surface microbiota of blueberries and also an effect of the bacteriocin treatment on microbiota composition.
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High hydrostatic pressure (HP) is a promising method to improve the microbiological quality of sous-vide foods. Monitoring the composition and behavior of the microbial communities in foods is of most importance for the production of high-quality and safe products. High-throughput sequencing (HTS) provides advanced approaches to determine food's microbial community composition and structure. The aim of the present study was to determine the impact of different HP treatments on the microbial load and bacterial diversity of sous-vide Atlantic cod. Sous-vide cooking at 57.1 °C for 30 min followed by HP treatment at 500 MPa for 8 min reduced viable cell counts (total aerobic mesophiles) in the cod samples below detectable levels for 45 days of storage under refrigeration. In a second trial with cod cooked sous-vide at 52 °C for 20 min followed by HP treatments at 300 or 600 MPa (with HP treatment temperatures of 22 °C or 50 °C for 4 or 8 min, depending on treatment), only the treatments at 600 MPa delayed bacterial growth for at least 30 days under refrigeration. The optimal HP conditions to improve the microbiological quality of sous-vide cod cooked at low temperatures were obtained at 600 MPa for 4 min at a pressurization temperature of 50 °C. Bacterial diversity was studied in cod cooked sous-vide at 52 °C for 20 min by HTS. In the absence of HP treatment, Proteobacteria was the main bacterial group. A succession of Pseudomonadaceae (Pseudomonas) and Enterobacteriaceae was observed during storage. Firmicutes had low relative abundances and were represented mainly by Anoxybacillus (early storage) and Carnobacterium (late storage). The HP-treated sous-vide cod showed the greatest differences from controls during late storage, with Aerococcus and Enterococcus as predominant groups (depending on the HP conditions). The application of HTS provided new insights on the diversity and dynamics of the bacterial communities of sous-vide cod, revealing the presence of bacterial genera not previously described in this food, such as Anoxybacillus. The significance of Anoxybacillus as a contaminant of seafoods should be further investigated.
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A draft genome of the putatively antibiotic-resistant Escherichia coli strain ANGUJ1, which was isolated from calf intestine from Boyacá, Colombia, is reported. The genome possessed genetic determinants for antibiotic resistance and multicompound resistance efflux pumps. In silico prediction analysis suggests phenotypic resistance to six classes of antibiotics plus aldehyde and peroxide.
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La enfermería reconocida como disciplina profesional cuenta con conocimientos dirigidos al cuidado de la vida humana, su desarrollo la ha diferenciado de otras disciplinas dándole visibilidad particular desde cuatro funciones: gestión, enseñanza, investigación y atención clínica. Para lo cual se generó una reflexión sobre los impactos positivos y negativos del evolucionar de enfermería en América Latina ante estas funciones, desde la gestión se evidencia avances importantes desde el liderazgo gremial y organizacional, pero retrocesos en el escalamiento político, e institucional. Existe brecha de la formación profesional en comparación a otras regiones, aun así, el crecimiento de programas educativos ha dado la posibilidad de la profesionalización, pero debate el reto de la calidad, la disparidad formativa y la oferta centrada en el paradigma clínico. En el campo investigativo se resalta la creación de programas doctorales y post graduales que amplían la generación de conocimiento, pero también se evidencian barreras en la transferencia y visibilidad colectiva del conocimiento. En el área clínica espacio con mayor abordaje de las acciones formativas y laborales del profesional, cuenta con grandes retos en su crecimiento, organización, escalamiento, seguridad y precariedad laboral. En esa perspectiva la comunidad U-Nursing LatAm se ha integrado para aportar a la región en estos retos. Finalmente se concluye que la mayoría de los desafíos son relacionados con las habilidades sociales y blandas que deben potencializarse en el plano personal y colectivo. Todas las situaciones requieren tener una valoración directa de las posibilidades de fortalecer y mejorar la enfermería desde cada país de la región, teniendo en cuenta las cuatro funciones.
Asunto(s)
Enfermería , Organización y Administración , Investigación , Enseñanza , Atención de EnfermeríaRESUMEN
The aim of this research work was the comparative study of the different properties of interest in the case of plastic materials for food use before and after being subjected to treatment by high hydrostatic pressure (HHP) as well as the impact of additivation with antimicrobials. This method of food preservation is currently on the rise and is of great interest because it is possible to extend the shelf life of many foods without the need for the use of additives or thermal processing, as is the case with other preservation methods currently used. The effects of HHP treatment (680 MPa for 8 min) on plastic materials commonly used in the food industry were studied. These materials, in sheet or film form, were polyethylene (PE), polyethylene terephthalate (PET), polystyrene (PS), multilayer polyethylene terephthalate-ethylene-vinyl alcohol copolymer-polyethylene (PET-EVOH-PE), multilayer polyethylene-polyethylene terephthalate (PE-PET), polyvinyl chloride aluminum (PVC-AL), and polylactic acid (PLA), which were provided by manufacturing companies in the sector. PE, PP, and PLA activated with tyrosol, zinc oxide, or zinc acetate were also tested. The phenomena and properties, such as overall migration, thermal behavior, oxygen barrier, and physical properties were analyzed before and after the process. The results show that the HHP process only slightly affected the properties of the materials. After pressurization, oxygen permeability increased greatly in PVC-AL (from 7.69 to 51.90) and decreased in PLA (from 8.77 to 3.60). The additivation of the materials caused a change in color and an increase in oxygen permeability. The additivated PE and PP showed migration values above the legal limit for certain simulants. The HHP treatment did not greatly affect the mechanical properties of the additivated materials. The main increases in the migration after HHP treatment were observed for PE activated with tyrosol or zinc oxide and for PS activated with zinc oxide. Activated PLA performed the best in the migration studies, irrespective of the HHP treatment. The results suggest that activated PLA could be used in HHP food processing as an inner antimicrobial layer in contact with the food packed in a container with the desired oxygen permeability barrier.
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The effects of high-hydrostatic pressure (HP) treatments (450 and 600 megapascals, MPa, for 5 min at temperatures of 22 °C and 50 °C) on the microbiota of a coriander and parsley dressing was studied via culture-dependent and culture-independent approaches. Samples were refrigerated for 20 days, with periodic counts of the culture media supplemented with, or without, antimicrobials. HP-treated samples showed significantly lower viable cell counts compared to untreated controls. Only the control samples yielded bacterial growth on media with antimicrobials (imipenem, cefotaxime, benzalkonium chloride), including mostly Pseudomonas and Lactobacillus. Bacillus and Paenibacillus were identified from pressurized samples. Few isolates showed higher tolerance to some of the biocides tested. Pseudomonads showed outstanding resistance to meropenem and ceftazidime. According to high-throughput sequencing analysis, the microbiota of the dressing control samples changes during storage, with a reduction in the relative abundance of Proteobacteria and an increase in Firmicutes. The composition of the residual microbiota detected during storage was highly dependent on the pressure applied, and not on the treatment temperature.
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El consumo de alcohol es una situación social con amplia aceptación, que representa en sus consecuencias un factor de riesgo importante para la carga de enfermedad, mortalidad, accidentalidad y afectaciones en el ámbito laboral. Las causas de este consumo se relacionan a los aspectos psicológicos, emocionales, sociales que se dan en la actividad en el trabajo, relación familiar o interacción social.
Alcohol consumption is a social situation with wide acceptance, which represents in its consequences an important risk factor for the burden of disease, mortality, accident and affectations in the work environment. The causes of this consumption are related to psychological, emotional and social aspects that occur in work activities, family relationships or social interaction.
Asunto(s)
Humanos , Pancreas DivisumRESUMEN
Señor editor: Los gobiernos a nivel mundial en los últimos 50 años han generado conjuntamente diversas agendas, compromisos y planes que abordan las necesidades derivadas de las interacciones sociales, económicas y ambientales; tal es el caso de Alma Ata, Agenda 21, y los Objetivos de Desarrollo Sostenible (ODS); entre otras, lo que conlleva a establecer responsabilidades políticas en salud relacionadas con el desarrollo sostenible en cada continente, región y país. Sin embargo, la actual crisis mundial generada por el Coronavirus (COVID-19) ha dificultado la continuidad de estos compromisos, priorizando el combate a este terrible mal y que hasta la fecha no existe una aparente solución.
Mr. Editor: Governments worldwide in the last 50 years have jointly generated various agendas, commitments and plans that address the needs arising from social, economic and environmental interactions; such is the case of Alma Ata, Agenda 21, and the Sustainable Development Goals (SDGs); among others, which leads to establish political responsibilities in health related to sustainable development in each continent, region and country. However, the current global crisis generated by the Coronavirus (COVID-19) has hindered the continuity of these commitments, prioritizing the fight against this terrible disease and to date there is no apparent solution.
RESUMEN
Guacamole is an avocado sauce highly appreciated for its pleasant taste and nutritional value. The present study addressed the impact of high-hydrostatic pressure (HP) treatments on the product safety and bacterial diversity. Four HP treatments, 5 min each, were applied: (A) 450 megapascals (MPa) at 22 °C; (B) 450 MPa at 50 °C; (C) 600 MPa at 22 °C; (D) 600 MPa at 50 °C. Controls and treated samples were refrigerated stored for 50 days. The residual surviving fraction was lowest for the 600 MPa treatment at 50 °C. Bacterial growth on media supplemented with antibiotics (cefotaxime and imipenem) or the biocide benzalkonium chloride was detected only from control samples but not from HP-treated samples. High throughput sequencing analysis indicated that the bacterial diversity of control samples was dominated by members of Fam. Enterobacteriaceae, but it changed to a lactic acid microbiota during storage. HP-treated samples showed reduced relative abundances of Enterobacteriaceae and lactic acid bacteria and higher abundances of Pantoea, Ralstonia and Methylobacterium. Results from the study indicate that HP treatments of guacamole at 50 °C show higher microbial inactivation compared to 22 °C. However, all treatments reduced the levels of Enterobacteriaceae and penem-tolerant bacteria and provided product stability against acidification by lactic acid bacteria.
