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1.
Nanotechnology ; 31(46): 465605, 2020 Nov 13.
Artigo em Inglês | MEDLINE | ID: mdl-32759478

RESUMO

Plasmonic bimetallic Ag-Cu nanodendrites were synthesized by an electrodeposition process and their potential as surface-enhanced Raman scattering (SERS) substrates was studied. We demonstrated a facile and efficient way for the preparation of highly sensitive SERS substrates. The electrodeposition time was an important parameter in the formation of Ag-Cu dendrites onto the Al sheet. The Ag-Cu dendrites showed an excellent response detecting Rhodamine 6 G at ultra-low concentrations such as 1 × 10-15 mol l-1. This Ag-Cu substrate possesses an excellent SERS activity and it could be used for the detection of molecules at trace level. This electrodeposition process could be extended for the fabrication of other plasmonic bimetallic dendrites.

2.
Nutr. clín. diet. hosp ; 40(1): 127-132, 2020. tab, graf
Artigo em Espanhol | IBECS | ID: ibc-194643

RESUMO

INTRODUCCIÓN: Hoy en día, algunas ecuaciones para estimar el porcentaje de grasa corporal (%GC) en deportistas son aquellas en donde se emplean 4 y 6 pliegues subcutáneos y, de acuerdo a la ecuación representará un tiempo importante en la ejecución de mediciones acelerando o no éste proceso y teniendo la posibilidad de medir a más o menos sujetos. Se pretende así como objetivo conocer el nivel de concordancia entre el %GC mediante dos ecuaciones antropométricas específicas para deportistas: Faulkner (1968) y Carter (1982). Material y MÉTODOS: Se seleccionaron 147 deportistas de diferentes disciplinas midiéndose 6 pliegues cutáneos. Para los análisis estadísticos se emplearon los métodos de Bland-Altman y el de correlación intraclase para el nivel de concordancia, el test de Kappa de Cohen para el grado de acuerdo entre categorías y la t de Student. RESULTADOS: En las mujeres los promedios de los modelos empleados no presentaron diferencias estadísticamente significativas (P=0,28) más, en los hombres si hubo diferencias (p < 0,000), las mujeres obtuvieron un nivel de concordancia muy bueno y un valor de bias de 1,22; en tanto que en el grupo de hombres se presenta una buena concordancia y un valor de bias de 3,39 y, de acuerdo al análisis Kappa, se muestra un grado de acuerdo alto y muy alto entre categorías de las mujeres, sucediendo lo contrario en el grupo de hombres, en donde se han obtenido índices Kappa muy bajos a moderados. CONCLUSIONES: Ambos modelos pueden ser intercambiables en las mujeres, para los hombres se recomienda el uso de cada ecuación dentro del grupo específico de donde se desarrolló


INTRODUCTION: Nowadays, some equations to estimate the percentage of body fat (%BF) in athletes are those where 4 and 6 subcutaneous folds are used and, according to the equation, it will represent an important time in the execution of measurements accelerating or not this process and having the possibility of measuring more or less subjects. It is thus intended as an objective to know the level of concordance between the %BF through two anthropometric equations specific to athletes: Faulkner (1968) and Carter (1982). MATERIAL AND METHODS: 147 athletes from different disciplines were selected measuring 6 skin folds. For the statistical analyzes, the Bland-Altman methods and the intraclass correlation method were used for the level of concordance, the Cohen Kappa test for the degree of agreement between categories and the student t. RESULTS: In women the averages of the models used did not show statistically significant differences (P = 0.28) more, in men if there were differences (p <0.000), the women obtained a very good level of concordance and a value of 1.22 bias; while in the group of men there is a good concordance and a value of bias of 3.39 and, according to the Kappa analysis, a high and very high degree of agreement between categories of women is shown, the opposite happening in the group of men, where very low to moderate Kappa indices have been obtained. CONCLUSIONS: Both models can be interchangeable in women, for men it is recommended to use each equation within the specific group from which it was developed


Assuntos
Humanos , Masculino , Feminino , Adolescente , Adulto Jovem , Atletas , Constituição Corporal , Distribuição da Gordura Corporal , Análise de Classes Latentes , Modelos Biológicos , Universidades , Estudantes
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