RESUMO
In the food industry, some fungi are considered to be common spoilage microorganisms which reduce the shelf life of products. To avoid this outcome, different technologies are being developed to control their growth. Electromagnetic fields (EMF) have been used to combat bacterial growth, but there are few studies on yeasts and their possible action mechanisms. For this reason, we studied the effect of EMF between 1 to 5.9 GHz bands on the growth of Saccharomyces cerevisiae yeast and observed that all the frequencies of the band used cause the reduction of the viability of this yeast. In addition, we observed that the distance between the antenna and the sample is an important factor to consider to control the growing yeast. By using transmission electron microscopy, we found that the EMF caused a loss of continuity of the yeast cell membrane. Therefore, EMF may be used as a control method for yeast growth.
RESUMO
La microbiota intestinal es el conjunto de millones de microrganismos vivos ubicados en el tracto gastrointestinal. Es indispensable en múltiples funciones del organismo, regulación de la inmunidad, en aspectos nutricionales y procesos de inflamación sistémica entre otros. La disbiosis es la alteración del equilibrio de la microbiota normal, debido a cambios en la composición, funcionamiento, orden o su distribución; esto puede predisponer al individuo a la adquisición de enfermedades gastrointestinales, alérgicas y metabólicas, entre otras. El objetivo del presente artículo es realizar una revisión narrativa de la literatura sobre los conceptos claves de la microbiota intestinal, sus asociaciones fisiopatológicas con desórdenes gastrointestinales, alérgicos y metabólicos en pediatría.
ntestinal microbiota are the millions of living microbial communities that inhabit the gastrointestinal tract. It is essential for multiple functions of the human organism, such as, immune-regulation, in nutritional aspects, and systemic inflammatory processes, among others. Dysbiosis refers to the alteration of the equilibrium of normal microbiota due to shifts in its composition, functioning, order or distribution; this can predispose the individual to develop gastrointestinal, allergic and metabolic diseases among others. The aim of this article was to conduct a narrative review of the literature on the key concepts of intestinal microbiota, and its pathophysiological associations with gastrointestinal, allergic and metabolic disorders in pediatrics.
Assuntos
Humanos , Masculino , Feminino , Adolescente , Trato Gastrointestinal , Disbiose , Microbiota , Alergia e Imunologia , Microbioma Gastrointestinal , GastroenteropatiasRESUMO
Brettanomyces bruxellensis negatively impacts on the sensorial quality of wine by producing phenolic compounds associated with unpleasant odors. Thus, the control of this spoilage yeast is a critical factor during the winemaking process. A recent approach used to biocontrol undesired microorganisms is the use of yeast released antimicrobial peptides (AMPs), but this strategy has been poorly applied to wine-related microorganisms. The aim of this study was to evaluate the antifungal capacity of Candida intermedia LAMAP1790 against wine-spoilage strains of B. bruxellensis and fermentative strains of Saccharomyces cerevisiae, and also to determine the chemical nature of the compound. The exposure of strains to the supernatant of C. intermedia saturated cultures showed antifungal activity against B. bruxellensis, without affecting the growth of S. cerevisiae. By fractionation and concentration of C. intermedia supernatants, it was determined that the antifungal activity was related to the presence of heat-labile peptides with molecular masses under 5 kDa. To our knowledge, this is the first report of AMPs secreted by C. intermedia that control B. bruxellensis. This could lead to the development of new biocontrol strategies against this wine-spoilage yeast.
Assuntos
Antifúngicos/farmacologia , Brettanomyces/efeitos dos fármacos , Candida/química , Peptídeos/farmacologia , Vinho/microbiologia , Antifúngicos/metabolismo , Brettanomyces/crescimento & desenvolvimento , Brettanomyces/metabolismo , Candida/metabolismo , Peptídeos/metabolismo , Fenóis/metabolismo , Vinho/análiseRESUMO
Introducción. Los eventos aparentemente letales (Apparent Life-Threatening Event, ALTE) son causa frecuente de hospitalización en lactantes. Hay poca información sobre el enfoque estandarizado para establecer su etiología, a pesar de que un diagnóstico causal correcto puede afectar la evolución clínica, la duración de la hospitalización y los recursos sanitarios. Objetivo. Comparar los efectos del enfoque diagnóstico estandarizado en lactantes hospitalizados por este tipo de eventos. Materiales y métodos. Se hizo un estudio retrospectivo de cohorte con base en los datos recolectados de las historias clínicas de lactantes hospitalizados por esta causa en el servicio de pediatría entre el 2002 y el 2009. Se analizaron dos cohortes de pacientes agrupados según su manejo: la cohorte 1, con guías clínicas, y la cohorte 2, con guías clínicas, protocolo de estudio y seguimiento ambulatorio. Se compararon los grupos en cuanto a la etiología, el tiempo de hospitalización y la tasa de nuevas hospitalizaciones. Resultados. De los 255 lactantes hospitalizados por eventos aparentemente letales, el 57,6 % integró la cohorte 1 y, el 42,3 %, la cohorte 2. No se observaron diferencias en cuanto a la edad y el sexo. En la cohorte 2 se observó un mayor porcentaje de causas atribuidas (63,9 Vs. 87,0; p<0,0001), y un menor tiempo de hospitalización (8,0 Vs. 5,0 días; p=0,0001). No hubo diferencias en cuanto a nuevas hospitalizaciones (10,5 Vs. 8,3 días; p=0,7435). Conclusiones. El enfoque del manejo de lactantes afectados por eventos aparente letales basado en protocolos, se asoció con un mayor porcentaje de reconocimiento de las causas atribuidas y con un menor período de hospitalización. A partir de estos resultados es posible sugerir la implementación de este tipo de estandarización para el manejo de dichos pacientes.
Introduction: An apparent life-threatening event (ALTE) is a frequent cause of hospitalization in infants. However, there is little evidence about the existence of a standardized approach to discover the main etiology, although a correct causal diagnosis can affect clinical evolution, hospital stay, and health resources. Objective: To determine the effects of a standardized diagnostic approach in infants admitted with ALTE. Materials and methods: We conducted a retrospective cohort study with the data collected from clinical records of infants hospitalized for ALTE in the pediatric unit between 2002 and 2009. Two cohorts of patients were analyzed according to the procedures defined for these cases: Cohort 1 with clinical guidelines and cohort 2 with clinical guidelines, study protocol, and outpatient follow-up. Etiological causes, hospitalization periods and readmission rates were compared between both cohorts. Results: Of the 255 infants hospitalized for ALTE, 57.6% corresponded to cohort 1 and 42.3% to cohort 2. No differences were observed in age and gender between groups. The highest percentage of attributed causes (63.9 vs 87.0%; p<0.0001) and a shorter period of hospitalization (8.0 vs 5.0 days; p=0, 0001) were observed in cohort 2. No differences in hospital readmission were observed (10.5 vs 8.3 days; p=0.7435). Conclusions: The protocol-based approach for infants with EAL was associated with a higher percentage of recognition of attributed causes and a shorter hospitalization period. Therefore, our results allow recommending this type of standardization for the management of these patients.
Assuntos
Evento Inexplicável Breve Resolvido , Lactente , Apneia , Protocolos Clínicos , HospitalizaçãoRESUMO
Dekkera bruxellensis is a spoilage yeast in wine and fuel ethanol fermentations able to produce volatile phenols from hydroxycinnamic acids by the action of the enzymes cinnamate decarboxylase (CD) and vinyphenol reductase (VR) in wine. However, there is no information about this ability in the bioethanol industry. This work evaluated CD and VR activities and 4-ethylphenol production from p-coumaric acid by three strains of D. bruxellensis and PE-2, an industrial Saccharomyces cerevisiae strain. Single and multiple-cycle batch fermentations in molasses and sugarcane juice were carried out. Dekkera bruxellensis strains showed similar CD activity but differences in VR activity. No production of 4-ethylphenol by S. cerevisiae in any fermentation system or media was observed. The concentrations of 4-ethylphenol peaked during active growth of D. bruxellensis in single-cycle fermentation but they were lower than in multiple-cycle fermentation. Higher concentrations were observed in molasses with molar conversion (p-coumaric acid to 4-ethylphenol) ranging from 45% to 85%. As the first report on 4-ethylphenol production in sugarcane musts by D. bruxellensis in industry-like conditions, it opens up a new avenue to investigate its effect on the viability and fermentative capacity of S. cerevisiae as well as to understand the interaction between the yeasts in the bioethanol industry.
Assuntos
Biocombustíveis , Dekkera/metabolismo , Etanol/metabolismo , Microbiologia Industrial , Fenóis/metabolismo , Brasil , Carboxiliases/análise , Cinamatos/metabolismo , Ácidos Cumáricos , Fermentação , Propionatos/metabolismo , Saccharomyces cerevisiae/metabolismo , Saccharum/metabolismoRESUMO
Introduction: An apparent life-threatening event (ALTE) is a frequent cause of hospitalization in infants. However, there is little evidence about the existence of a standardized approach to discover the main etiology, although a correct causal diagnosis can affect clinical evolution, hospital stay, and health resources. Objective: To determine the effects of a standardized diagnostic approach in infants admitted with ALTE. Materials and methods: We conducted a retrospective cohort study with the data collected from clinical records of infants hospitalized for ALTE in the pediatric unit between 2002 and 2009. Two cohorts of patients were analyzed according to the procedures defined for these cases: Cohort 1 with clinical guidelines and cohort 2 with clinical guidelines, study protocol, and outpatient follow-up. Etiological causes, hospitalization periods and readmission rates were compared between both cohorts. Results: Of the 255 infants hospitalized for ALTE, 57.6% corresponded to cohort 1 and 42.3% to cohort 2. No differences were observed in age and gender between groups. The highest percentage of attributed causes (63.9 vs 87.0%; p<0.0001) and a shorter period of hospitalization (8.0 vs 5.0 days; p=0, 0001) were observed in cohort 2. No differences in hospital readmission were observed (10.5 vs 8.3 days; p=0.7435). Conclusions: The protocol-based approach for infants with EAL was associated with a higher percentage of recognition of attributed causes and a shorter hospitalization period. Therefore, our results allow recommending this type of standardization for the management of these patients.
Introducción. Los eventos aparentemente letales (Apparent Life-Threatening Event, ALTE) son causa frecuente de hospitalización en lactantes. Hay poca información sobre el enfoque estandarizado para establecer su etiología, a pesar de que un diagnóstico causal correcto puede afectar la evolución clínica, la duración de la hospitalización y los recursos sanitarios.Objetivo. Comparar los efectos del enfoque diagnóstico estandarizado en lactantes hospitalizados por este tipo de eventos.Materiales y métodos. Se hizo un estudio retrospectivo de cohorte con base en los datos recolectados de las historias clínicas de lactantes hospitalizados por esta causa en el servicio de pediatría entre el 2002 y el 2009. Se analizaron dos cohortes de pacientes agrupados según su manejo: la cohorte 1, con guías clínicas, y la cohorte 2, con guías clínicas, protocolo de estudio y seguimiento ambulatorio. Se compararon los grupos en cuanto a la etiología, el tiempo de hospitalización y la tasa de nuevas hospitalizaciones.Resultados. De los 255 lactantes hospitalizados por eventos aparentemente letales, el 57,6 % integró la cohorte 1 y, el 42,3 %, la cohorte 2. No se observaron diferencias en cuanto a la edad y el sexo. En la cohorte 2 se observó un mayor porcentaje de causas atribuidas (63,9 Vs. 87,0; p<0,0001), y un menor tiempo de hospitalización (8,0 Vs. 5,0 días; p=0,0001). No hubo diferencias en cuanto a nuevas hospitalizaciones (10,5 Vs. 8,3 días; p=0,7435).Conclusiones. El enfoque del manejo de lactantes afectados por eventos aparente letales basado en protocolos, se asoció con un mayor porcentaje de reconocimiento de las causas atribuidas y con un menor período de hospitalización. A partir de estos resultados es posible sugerir la implementación de este tipo de estandarización para el manejo de dichos pacientes.
Assuntos
Evento Inexplicável Breve Resolvido/diagnóstico , Algoritmos , Estudos de Coortes , Técnicas e Procedimentos Diagnósticos/normas , Feminino , Hospitalização/estatística & dados numéricos , Humanos , Lactente , Masculino , Estudos RetrospectivosRESUMO
Apnea and apparently lethal events have great etiological diversity thus complementary tests may help diagnosis. The aim of this study was to describe the results of polygraph studies of children under 3 months hospitalized with suspected apnea. PATIENTS AND METHODS: Retrospective case series. Children under 3 months with suspected apnea were considered and in whom a polygraphy (PG) was performed during hospitalization. General data, the apnea/hypopnea index (AHI), index of central. apnea, obstructive apnea index, average and minimum saturation were recorded. Desaturation index (ID) below 80% higher 1 per hour, one or more events of desaturation below 80% for more than 20 seconds or an AHI greater than or equal 1 were considered as criteria of sleep disorder breathing (SLB). Descriptive analysis was performed and the associations between AHI and saturation parameters were determined. RESULTS: 51 patients, 32 males, entered the study. 15,6% had altered PG. In 5 of them coexisted more than one diagnostic criterion. Iin 15,6% of the patients was observed an IAH greater 1, in 7.8% a desaturation index below 80% and in 11,8% a desaturation index under 80% for 20 seconds greater than 1. The AHI was associated with the parameters of saturation. CONCLUSION: Most of the patients had normal PG and among patients with a suggestive SLB a pattern of respiratory immaturity prevailed, which is characteristic of this age.
Assuntos
Hospitalização , Polissonografia/métodos , Síndromes da Apneia do Sono/diagnóstico , Criança Hospitalizada , Feminino , Humanos , Lactente , Recém-Nascido , Masculino , Estudos RetrospectivosRESUMO
La apnea y eventos aparentemente letales poseen una gran diversidad etiológica por tanto exámenes complementarios podrían contribuir a su diagnóstico. El objetivo del presente estudio fue describir los resultados de estudios poligráficos de niños menores de 3 meses hospitalizados con sospecha de apnea. PACIENTES Y MÉTODO: Serie retrospectiva de casos. Se consideraron niños menores de 3 meses con sospecha de apnea y en quienes se realizó una poligrafía (PG) durante su hospitalización. Se registraron datos generales, así como también, el índice de apnea/hipopnea (IAH), índice de apnea central, índice de apnea obstructiva, saturación promedio y mínima. Como criterios de trastornos respiratorios del sueño (TRS) fueron considerados: índice de desaturaciones (ID) por debajo de 80% mayor 1 por hora; uno o más eventos de desaturaciones por debajo de 80% por más de 20 segundos; o un IAH mayor o igual 1. Se realizó estadística descriptiva y se determinó la posible asociación entre el IAH y parámetros de saturación. RESULTADOS: Ingresaron 51 pacientes, 32 varones. 8 (15,6%) presento PG alteradas, de ellos, en 5 coexistió más de un criterio diagnóstico. En el 15,6% se observó un IAH mayor o igual a 1, en el 7,8% se observó un índice de desaturación bajo 80% y en el 11,8% un índice de desaturación bajo 80% por más de 20 segundos. El IAH se asoció con los parámetros de saturación. CONCLUSIÓN: La mayoría de los pacientes presentó PG normales y entre los pacientes con TRS predominó un patrón poligráfico sugerente de inmadurez respiratoria, lo cual, es característico de esta edad.
Apnea and apparently lethal events have great etiological diversity thus complementary tests may help diagnosis. The aim of this study was to describe the results of polygraph studies of children under 3 months hospitalized with suspected apnea. PATIENTS AND METHODS: Retrospective case series. Children under 3 months with suspected apnea were considered and in whom a polygraphy (PG) was performed during hospitalization. General data, the apnea/hypopnea index (AHI), index of central. apnea, obstructive apnea index, average and minimum saturation were recorded. Desaturation index (ID) below 80% higher 1 per hour, one or more events of desaturation below 80% for more than 20 seconds or an AHI greater than or equal 1 were considered as criteria of sleep disorder breathing (SLB). Descriptive analysis was performed and the associations between AHI and saturation parameters were determined. RESULTS: 51 patients, 32 males, entered the study. 15,6% had altered PG. In 5 of them coexisted more than one diagnostic criterion. Iin 15,6% of the patients was observed an IAH greater 1, in 7.8% a desaturation index below 80% and in 11,8% a desaturation index under 80% for 20 seconds greater than 1. The AHI was associated with the parameters of saturation. CONCLUSION: Most of the patients had normal PG and among patients with a suggestive SLB a pattern of respiratory immaturity prevailed, which is characteristic of this age.
Assuntos
Humanos , Masculino , Feminino , Recém-Nascido , Lactente , Síndromes da Apneia do Sono/diagnóstico , Polissonografia/métodos , Hospitalização , Criança Hospitalizada , Estudos RetrospectivosRESUMO
Croup is a frequent cause of outpatient and emergency consultation. It is frequently triggered by a viral respiratory infection and characterized by an abrupt onset. We describe current studies about the treatment of croup. The use of systemic corticosteroids stands out as choice treatment, and nebulized epinephrine as short term therapy while waiting for the anti-inflammatory effect of steroids.
El Croup (laringitis aguda) es motivo frecuente de consulta en servicios de urgencia y policlínicos pediátricos. Generalmente es gatillado por una infección respiratoria viral y se caracteriza por un inicio abrupto. En el presente texto se describen los estudios vigentes acerca de su tratamiento. Destacan los corticoides sistémicos como terapia de elección y la adrenalina nebulizada como terapia de acción corta en espera de la acción antinflamatoria esteroidal.
Assuntos
Humanos , Criança , Crupe/diagnóstico , Crupe/tratamento farmacológico , Corticosteroides/uso terapêutico , Dexametasona/uso terapêutico , Laringite/diagnóstico , Laringite/tratamento farmacológico , Prednisolona/uso terapêutico , Sons RespiratóriosRESUMO
Infections are a frequent cause of apnea in infants, involving both respiratory and extrarrespiratory systems. In the first group we find upper respiratory infections and lower respiratory infections caused by virus or bacteria such as Respiratory Syncytial Virus, Parainfluenza and Bordetella pertussis; in the second group urinary tract infections and severe infections such as meningitis and sepsis are of importance. In this article we analyze different causes of infections attributed to apnea, taking into account existing literature at the time.
Las infecciones son una frecuente causa de apneas en lactantes, pudiendo involucrar tanto el sistema respiratorio como extrarrespiratorio. En el primero encontramos las infecciones respiratorias altas y/o bajas producidas tanto por virus como bacterias, donde destacan Virus Respiratorio Sincicial, Parainfluenza y Bordetella Pertussis; en el segundo grupo son de importancia la infección urinaria e infecciones graves como meningitis y sepsis. En este artículo se analizan estas distintas causas infecciosas atribuidas a eventos de apneas en lactantes, en consideración a la literatura actualmente existente.