22 research outputs found

    BioestratigrafĂ­a de ForaminĂ­feros del Toarciense del Atlas Medio (Marruecos). CorrelaciĂłn con las regiones vecinas

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    Los depósitos del Toarciense del Atlas Medio, generalmente de tipo hemipelágico, presentan características de plataforma y de cuenca. Son depósitos margosos, confinados en los depocentros, y depósitos condensados calcáreo-margosos, en los altos de la cuenca. Los estudios micropaleontológicos de foraminíferos bentónicos nos permiten seguir la extensión bioestratigráfica de las diferentes especies encontradas. Se han establecido las siguientes cuatro biozonas: biozona con Lingulina. gr. tenera y Marginulina gr. prima; biozona con Lenticulina obonensis mg Planularia; biozona con Lenticulina pennensis mg Marginulinopsis, Ichtyolaria hauffi, Dentalina utriculata, Citharina longuemari var. angusta-gradata y espectro de Lenticulina chicheryi; y biozona con Lenticulina d’orbignyi mg Lenticulina, Astacolus y Planularia, Nodosaria pulchra y Lenticulina ferruginea mg Falsopalmul

    Utilization of prickly pear waste for baker's yeast production

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    The feasibility of baker's yeast production using fruits and peels of Opuntia ficus indica (OFI) as carbohydrate feedstock was investigated. Two response surface methodologies involving central composite face centered design (CCFD) were successfully applied. The effects of four independent variables on baker's yeast production from OFI fruit juice was evaluated using the first CCFD. The best results were obtained with 24 H of inoculum age, 30 degrees C temperature, 200 rpm of agitation, and 10% inoculum size. At the maximum point, the biomass concentration reached 9.29 g/L. A second CCFD was performed to optimize the sugar extraction from OFI fruit peels. The potential of these latter as a fermentation substrate was determined. From the experimental results, the OFI fruit peel is an appropriate carbon source for the production of baker's yeast. The maximum biomass concentration was 12.51 g/L. Different nitrogen supplements were added to promote the yields of baker's yeast. Corn steep liquor was found to be the best alternative nutrient source of casein hydrolysate and yeast extract for baker's yeast production.info:eu-repo/semantics/publishedVersio

    Primeras icnitas de dinosaurio en sur del Alto Atlas Central. Carixiense (FormaciĂłn de Arhbalou. Goulmina. Marruecos)

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    The first found tracks of dinosaur in the North of the Goulmima-Tinerhir line (Inner Haut Atlas Central, Morocco) are described. They are located in the Arhbalou Formation and come from isolated and grouped prints mainly of theropod dinosaur. They have importance by the enlargement of the geographical area with dinosaur paleoichnological sites and by they constitute the first dated Carixian dinosaur footprints founds in Morocco

    Nuevos yacimientos de icnitas de dinosaurios carixienses. Sur del Alto Atlas Central ( Goulmima. Marruecos)

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    On the nor th of the Goulmima-Tinerhir line three new dinosaur ichnological sites were discovered. The new ichnites and sites (21 and 3) are added to the 23 footprints and 4 outcrops known until now. All sites are in the Aghbalou Formation (Carixian) being those described in this work, older that previously known. Eubrontes, other not identified theropod and possibly sauropod ichnites are described in the new localities. The litology and the direct and indirect structures accompanying of the footsteps also suppose a contribution for the extension of variation both in the sedimentary materials and morphologic ichnological types in the region

    Effects of different harvesting seasons on antioxidant activity and phenolic content of prickly pear cladode juice

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    The study was carried out to evaluate the effect of environmental conditions on the phenolic content and antioxidant activity of two distinct cladode genotypes under three sampling dates (spring, summer, and winter). The juice extracted from Opuntia ficus-indica (spineless) and Opuntia megacantha (spiny) genotypes was analyzed for their phenolics content and antioxidant activity using DPPH, ABTS, and FRAP methods. The composition of major phenolics substances of cladode juice harvested in March was determined by HPLC analysis. The average of the total phenolics content ranged from 455.65 to 542.70 Όg GAE mL−1. The antioxidant activity varied from 1.78 to 4.10 Όmol TE mL−1 by DPPH assay, 12.78–23.10 Όmol TE mL−1 by ABTS assay and 1.74–3.33 Όmol TE mL−1 by FRAP assay. Higher values of antioxidant activity and polyphenols content were registered in summer. O. ficus-indica recorded significantly higher values for the parameters compared to O. megacantha. Keywords: Prickly pear cactus, Opuntia ficus-indica, Opuntia megacantha, Cladode juice, Antioxidant activity, Polyphenol

    Earliest evidence of modern human life history in North African Homo sapiens

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    Earliest evidence of modern human life history in North African early Homo sapiens

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    Earliest evidence of modern human life history in North African early Homo sapiens

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    Recent developmental studies demonstrate that early fossil hominins possessed shorter growth periods than living humans, implying disparate life histories. Analyses of incremental features in teeth provide an accurate means of assessing the age at death of developing dentitions, facilitating direct comparisons with fossil and modern humans. It is currently unknown when and where the prolonged modern human developmental condition originated. Here, an application of x-ray synchrotron microtomography reveals that an early Homo sapiens juvenile from Morocco dated at 160,000 years before present displays an equivalent degree of tooth development to modern European children at the same age. Crown formation times in the juvenile's macrodont dentition are higher than modern human mean values, whereas root development is accelerated relative to modern humans but is less than living apes and some fossil hominins. The juvenile from Jebel Irhoud is currently the oldest-known member of Homo with a developmental pattern (degree of eruption, developmental stage, and crown formation time) that is more similar to modern H. sapiens than to earlier members of Homo. This study also underscores the continuing importance of North Africa for understanding the origins of human anatomical and behavioral modernity. Corresponding biological and cultural changes may have appeared relatively late in the course of human evolution
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