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1.
Heliyon ; 6(5): e03854, 2020 May.
Article in English | MEDLINE | ID: mdl-32395648

ABSTRACT

A new phenomenological model, based on a second order dissolution kinetics, was developed for the alkaline removal of non-collagenous protein (NCP) from the skin of Nile tilapia (SNT). This model allows estimating the liquid concentration of NCP in terms of temperature, skin size, NaOH concentration and time. This model was fitted with 135 experiments averaging a R2 of 0.99. The root-mean-square deviation and the mean-absolute-percentage error of the model were 0.0041 and 3.15%, respectively. The Arrhenius-activation energy was 15-122 kJ mol-1. Multi-objective optimization led to the highest NCP extraction (NCPE) of 24.3% and to the lowest loss of collagen (LC) of 1.3%, with R2 coefficients of 0.98 and 0.92, respectively. Ultimately, SNT deproteinized under optimal conditions was subjected to acid extraction and purification. FTIR and SEM analyses indicated that the product was a Type I collagen that could be used in the pharmaceutical industry.

3.
Lima; s.n; 2014. 62 p. ilus, tab, graf.
Thesis in Spanish | LIPECS | ID: biblio-1113557

ABSTRACT

Introducción: En la actualidad la determinación temprana del sexo fetal tiene importancia médica debido a las anomalías congénitas y patologías ligadas al sexo, por otra parte está la curiosidad de los padres por saber si su primogénito es varón o mujer. Sin embargo muchas veces tienen que esperar hasta el segundo o tercer trimestre o en el peor de los casos hasta el nacimiento para poder saberlo, existen pruebas genéticas que detectan el sexo precozmente pero son invasivas, las cuales pueden conllevar un riesgo; es por este motivo que mediante la visualización del tubérculo genital queremos valorar la ultrasonografía en el sexo fetal ya que es una buena alternativa al ser este un estudio no invasivo. Materiales y Métodos: Se realizó un estudio de tipo observacional, descriptivo, prospectivo y cuantitativo en 80 gestantes que se encontraban entre la 11va y 14va semana del CENTRO DE APOYO AL DIAGNOSTICO MEDICO "MEDICAL" en los meses de Mayo a Septiembre del 2013. Para determinar la valoración de la Ultrasonografía en el diagnóstico de detección precoz del sexo fetal, se utilizó un cuestionario para la recolección de los datos que nos permite el registro de la gestante en el primer trimestre, para ser demostradas en evaluaciones del 2do o 3er trimestre. Resultados: La valoración de la ultrasonografía en el diagnóstico precoz del sexo fetal por evaluación del tubérculo genital presento un VPP del 93.6 por ciento, una sensibilidad del 98.3 por ciento, especificidad del 80 por ciento, se vio que el acierto del sexo fetal era más certero en el sexo masculino y el tiempo de evaluación en mayor cantidad en gestantes que se encontraban en la semana 12. Conclusión: La evaluación del tubérculo genital por ultrasonografía entre la semana 11 a 14 debe considerarse un método fiable como predictor precoz del sexo fetal y debería incluirse habitualmente como parte de la evaluación de toda gestante en esta etapa.


Introduction: At present, the early determination of fetal sex is important due to congenital anomalies and sex-linked diseases, moreover curiosity of parents to know the sex of their firstborn if male or female but many have to wait until the second or third trimester or in the worst case until birth to know, there are genetic tests that detect early sex but are invasive which may pose a risk, it is for this reason that by displaying the genital tubercle ultrasonography want to value in fetal sex as it is a good alternative as this is a non-invasive study. Materials and Methods: A study of observational, descriptive, prospective and quantitative 80 pregnant women was among the 11th and 14th week SUPPORT CENTER MEDICAL DIAGNOSTIC "MEDICAL" in the months of May to September 2013. To determine the value of ultrasonography in the diagnosis of fetal sex screening, a questionnaire was used to collect data that allows the registration of pregnant women in the first trimester to be demonstrated in evaluations of the 2nd or 3rd quarter. Results: The evaluation of ultrasonography in the early diagnosis of fetal sex assessment of the genital tubercle present a PPV of 93.6 per cent, a sensitivity of 98.3 per cent, specificity of 80 per cent, was the success of the fetal sex was more accurate in males evaluated and the time at higher levels in pregnant women who were in week 12. Conclusion: The evaluation of the genital tubercle by ultrasound between weeks 11 and 14 should be considered a reliable method as an early predictor of fetal sex and should usually be included as part of the assessment of all pregnant women at this stage.


Subject(s)
Female , Humans , Pregnancy , Adolescent , Young Adult , Adult , Congenital Abnormalities , Sex Characteristics , Genetic Testing , Ultrasonography, Prenatal , Observational Studies as Topic , Prospective Studies
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