Confluent and Reticulated Papillomatosis With Linear Pseudo-striae: A Description of 20 Cases. / Papilomatosis confluente y reticulada con pseudoestrías lineales: descripción de 20 casos.

Confluent and reticulated papillomatosis, also known as Gougerot-Carteaud Syndrome, is a rare chronic disease typically affecting young adults. Of unknown etiology, the condition is characterised by oval grayish-brown or erythematous papules that coalesce to form a reticular pattern, usually on the trunk, especially in the intermammary or interscapular region and on the neck. Diagnosis is primarily clinical, based on the appearance of the lesions, the areas affected, and the response to treatment with minocycline. We report 20 cases of patients with histologically confirmed confluent and reticulated papillomatosis who presented linear pseudo-striae, a little known diagnostic sign.

Tasa de recaída y factores pronóstico de recaída después del tratamiento con isotretinoína oral en pacientes con acné quístico / Acne Relapse Rate and Predictors of Relapse Following Treatment with Oral Isotretinoin

Introducción: Las recaídas después del tratamiento con isotretinoína oral varían entre el 10 y el 60% según los esquemas utilizados, el tiempo de seguimiento y las características de la población estudiada. El objetivo de este estudio fue establecer la tasa de recaída durante los 2 primeros años de seguimiento postratamiento e identificar los factores pronóstico asociados con la recaída. Material y método: Se realizó un estudio de seguimiento a una cohorte de pacientes con acné quístico que completaron una dosis terapéutica total de mínimo 120mg/kg de isotretinoína oral. Se analizaron los datos utilizando herramientas de estadística descriptiva y analítica. Se calculó la tasa de recaída empleando el número de eventos sobre el denominador persona tiempo. Los factores pronóstico se establecieron a través del método de análisis multivariado de regresión de Cox. Resultados: Se siguieron 142 pacientes durante 24 meses o hasta la ocurrencia del evento. La tasa de incidencia de recaída fue de 15 eventos por 100 personas/año de seguimiento. El riesgo de recaer fue el doble en los pacientes de sexo masculino. El tratamiento de mantenimiento con retinoides tópicos brindó una protección del 32% por cada mes de uso. Las mujeres que no tomaron tratamiento antiandrógeno tuvieron un riesgo de sufrir recaída 3,5 veces mayor. Conclusiones: La tasa de recaída en nuestra población es alta y similar a la comunicada en otros estudios. El tratamiento de mantenimiento con retinoides tópicos en hombres y mujeres, y el tratamiento antiandrógeno en mujeres, ayudan a evitar recaídas (AU)

Background: Relapse rates in patients with acne after treatment with oral isotretinoin vary between 10% and 60% depending on the dosage regimen used, the length of follow-up, and the characteristics of the study population. The aim of this study was to determine the acne relapse rate within 2 years of completion of isotretinoin therapy and to identify the prognostic factors associated with relapse. Material and methods: We studied a series of patients with cystic acne who had received acumulative therapeutic dose of at least 120 mg/kg of oral isotretinoin. Data were analyzed using descriptive and analytical statistical methods. The relapse rate was expressed as the number of events divided by the amount of person-time. Factors predicting relapse were identified using multivariate Cox regression analysis. Results: A total of 142 patients were followed up for 24 months or until relapse occurred. The relapse rate was 15 events per 100 person-years of follow-up. The risk of relapse was twice as high among men. The protective effect of maintenance treatment with topical retinoids was32% for each month of use. The risk of relapse was 3.5 times higher among women not receiving antiandrogen therapy. Conclusions: The relapse rate in our study was high and similar to that reported in the literature, Maintenance treatment with topical retinoids in men and women and androgen treatment in women helped to prevent relapse (AU)

Acne relapse rate and predictors of relapse following treatment with oral isotretinoin.

BACKGROUND: Relapse rates in patients with acne after treatment with oral isotretinoin vary between 10% and 60% depending on the dosage regimen used, the length of follow-up, and the characteristics of the study population. The aim of this study was to determine the acne relapse rate within 2 years of completion of isotretinoin therapy and to identify the prognostic factors associated with relapse. MATERIAL AND METHODS: We studied a series of patients with cystic acne who had received a cumulative therapeutic dose of at least 120 mg/kg of oral isotretinoin. Data were analyzed using descriptive and analytical statistical methods. The relapse rate was expressed as the number of events divided by the amount of person-time. Factors predicting relapse were identified using multivariate Cox regression analysis. RESULTS: A total of 142 patients were followed up for 24 months or until relapse occurred. The relapse rate was 15 events per 100 person-years of follow-up. The risk of relapse was twice as high among men. The protective effect of maintenance treatment with topical retinoids was 32% for each month of use. The risk of relapse was 3.5 times higher among women not receiving antiandrogen therapy. CONCLUSIONS: The relapse rate in our study was high and similar to that reported in the literature, Maintenance treatment with topical retinoids in men and women and androgen treatment in women helped to prevent relapse.

Analysis of a reactive extraction process for biodiesel production using a lipase immobilized on magnetic nanostructures.

Magnetic nanoparticles were prepared by coprecipitating Fe(2+) and Fe(3+) ions in a sodium hydroxide solution and used as support for lipase. The lipase-coated particles were applied in a reactive extraction process that allowed separation of the products formed during transesterification. Kinetics data for triolein and ethanol consumption during biodiesel (ethyl oleate) synthesis together with a thermodynamic phase equilibrium model (liquid-liquid) were used for simulation of batch and continuous processes. The analysis demonstrated the possibility of applying this biocatalytic system in the reactive zone using external magnetic fields. This approach implies new advantages in efficient location and use of lipases in column reactors for producing biodiesel.

Production of bioethanol from sugarcane bagasse: Status and perspectives.

Lignocellulosic biomass is considered as the future feedstock for ethanol production because of its low cost and its huge availability. One of the major lignocellulosic materials found in great quantities to be considered, especially in tropical countries, is sugarcane bagasse (SCB). This work deals with its current and potential transformation to sugars and ethanol, considering pretreatment technologies, detoxification methods and biological transformation. Some modeling aspects are exposed briefly. Finally stability is discussed for considering the high nonlinear phenomena such as multiplicity and oscillations, which make more complex the control as a result of the inhibition problems during fermentation when furfural and formic acid from SCB hydrolysis are not absent.