The aluminium (Al) content of soft drinks from Al cans has been measured during 12 months of storage, by the graphite furnace atomic absorption spectrophotometry (GFAAS) method. The results show that the Al content in all soft drinks increased during the whole storage time. This increase was a result of dissolution of Al from the can wall due to the presence of aggressive ingredients in the soft drinks, mainly acids. The Al content rose with increasing acid concentration and decreasing pH value of the soft drinks. The evaluated possible daily intake of Al (0.8 mg) through consumption of these drinks was practically negligible in relation to total daily dietary Al intake, as well as to tolerable daily intake. Thus, soft drinks from Al cans are an insignificant source of dietary Al intake and it appears that the Al intake from this source should not be a cause for concern in regard to Al toxicity for the human body.
Selenium levels in human milk in the winter period ranged from 5.3 micrograms/l to 23.8 micrograms/l, the mean value being 11.0 micrograms/l. The nursing women were divided into several groups according to the results of a questionnaire, i.e. according to their social status (refugees or otherwise), number of deliveries, post partum days, the weight they had gained during pregnancy, their age and smoking habits. The mean levels of selenium for each group are presented. Selenium was determined by hydride generation atomic absorption spectrometry.
Esta obra, editada por José María Infante Bonfiglio y María Eugenia Flores Treviño, recoge doce trabajos de investigación presentados en el VI Coloquio Internacional del Programa EDICE (Estudios sobre el Discurso de la Cortesía en Español), celebrado en 2011 en Monterrey (México). Dichos trabajos aparecen organizados en tres partes, dedicadas respectivamente a estudios sobre imagen y (des)cortesía, actos de habla y (des)cortesía y atenuación.Los autores cuyas investigaciones integran este libro asumen que la (des) cortesía varía de una cultura a otra, y, por tanto, se basan en postulados teóricos de pragmática sociocultural. En este sentido, adquieren gran importancia las nociones de Bravo (otros trabajos), quien enriqueció las categorías analíticas básicas antecedentes de carácter universalista, dando cuenta de la importancia de los factores de variación sociocultural en los estudios de (des)cortesía.Al inicio, los editores ofrecen una reflexión sobre ciertas deficiencias tanto formales como conceptuales prototípicas en estudios de esta índole, tales como la falta de consenso entre los investigadores en cuanto a la metodología y la terminología empleadas. Se defiende la necesidad de contemplar la concepción que se tiene de determinados valores culturales a la hora de abordar los estudios sobre (des)cortesía. Asimismo, critican el hecho de que la mayoría de los estudiosos se aferren excesivamente a las teorías de autores precedentes para avalar sus investigaciones. Esta crítica se centra en aquellos trabajos fundamentados en los postulados universalistas de Brown y Levinson (1987), los cuales no pueden sostenerse, según los autores, si se examinan los avances de la teoría social de las últimas décadas (p. 11).La primera parte de la obra se abre con un trabajo de Carmen Curcó Cobos, en el que se defiende la postura contraria. Esta autora aboga por el conservadurismo metodológico. Sin dejar de otorgar importancia a la consideración de valores culturales, apuesta por no abandonar la clásica noción de imagen pública. Seguidamente, hace un recorrido bibliográfico por trabajos de autores -9786072703285
The effect of season and species of plant on the ash and chromium (Cr) content of honey was studied. There were four types of honey: sunflower, acacia, floral and wild floral. In total there were 80 samples. The botanical origin of the honey was determined by microscopic analyses of pollen as well as the organoleptic properties. The Cr content was measured by flame atomic absorption spectrophotometry. The average Cr content in two consecutive seasons for all species was 0.121 microgram/g wet weight, and 0.1515 microgram/g dry weight. For sunflower, acacia, floral and wild floral honey the mean values were 0.103 microgram/g, 0.152 microgram/g, 0.125 microgram/g and 0.098 microgram/g wet weight and 0.1305 microgram/g, 0.1883 microgram/g, 0.1603 microgram/g and 0.1206 microgram/g dry weight, respectively. The average ash content in all 80 samples was 0.141%. There was a statistically significant (P < 0.05) influence of season on the ash content as well as interaction of species and season on the Cr content.
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