Arquetipos populares, arquetipos cultos y sagrada escritura en la poesía popular española

En las coplas reunidas por Margit Frenk bajo el epígrafe: "Que si soy morena", así como en varias referidas a fiestas de la Virgen o agrupadas en otros temas, de índole amorosa, se cruzan varias tradiciones: el tema paneuropeo evocado por la misma investigadora de la afirmación del color moreno, la tradición asociada al nivel culto o noble de la belleza clara, incluso expresamente rubia y de ojos verdes estudiada desde Faral, Lecoy, Dámaso Alonso o María Rosa Lida y en fin una clara presencia bíblica, sobre todo del Cantar de los Cantares. Dada la intensa difusión y comentarios de este libro bíblico en los monasterios, especialmente benedictinos y cistercienses, y en la liturgia mariana, son muchas las vías posibles de interpenetración con la cultura popular.

Se nas pedras faz feguras parecer... Consideraciones sobre iconografía mariana y figuras poéticas en las Cantigas de Santa María de Alfonso X

La iconografía mariana ha quedado reflejada en la poesía hispánica medieval de muchas maneras: desde versos que describen a la Virgen y sus atributos hasta conceptos teológicos y mariológicos expresados plásticamente mediante formas retóricas. Por ejemplo, el jardín y las flores como ornamentos y símbolos personales de Santa María, o bien la imagen de la luz a través de un cristal o una ventana de vidrio en escenas de la Anunciación -con abundantes testimonios pictóricos en el arte medieval-, se encuentran en la poesía en forma de descripciones simbólicas de diversa extensión y género y, por otro lado, de advocaciones marianas o tópicos mariológicos (Ave/Eva, Flos, Hortus, Radix-Virga, Regina, Stella). Este artículo propone, pues, un estudio de conjunto y comparativo de algunos de estos procedimientos, concentrándose en las Cantigas de Santa María del rey Alfonso X. En este sentido, las figuras retóricas, como herramientas que tienden un puente entre lo pictórico y lo poético, dirigen necesariamente la lectura hacia una interpretación simbólica proporcionada por la figuración o typologia, tal como la ha postulado Erich Auerbach para la textualidad medieval. En última instancia, el valor sagrado de la imagen mariana (una herencia del arte icónico bizantino) se representa también en los milagros de las Cantigas de Santa María, obra maestra que evidencia una fuerte influencia de la doctrina iconodúlica.

ATPase activity, proton gradients and proton secretion inhibition during experiments with Sepia officinalis and Sepioteuthis lessoniana

The constraints of an active life in a pelagic habitat led to numerous convergent morphological and physiological adaptations that enable cephalopod molluscs and teleost fishes to compete for similar resources. Here, we show for the first time that such convergent developments are also found in the ontogenetic progression of ion regulatory tissues; as in teleost fish, epidermal ionocytes scattered on skin and yolk sac of cephalopod embryos appear to be responsible for ionic and acid-base regulation before gill epithelia become functional. Ion and acid-base regulation is crucial in cephalopod embryos, as they are surrounded by a hypercapnic egg fluid with a Pco2 between 0.2 and 0.4 kPa. Epidermal ionocytes were characterized via immunohistochemistry, in situ hybridization, and vital dye-staining techniques. We found one group of cells that is recognized by concavalin A and MitoTracker, which also expresses Na+/H+ exchangers (NHE3) and Na+-K+-ATPase. Similar to findings obtained in teleosts, these NHE3-rich cells take up sodium in exchange for protons, illustrating the energetic superiority of NHE-based proton excretion in marine systems. In vivo electrophysiological techniques demonstrated that acid equivalents are secreted by the yolk and skin integument. Intriguingly, epidermal ionocytes of cephalopod embryos are ciliated as demonstrated by scanning electron microscopy, suggesting a dual function of epithelial cells in water convection and ion regulation. These findings add significant knowledge to our mechanistic understanding of hypercapnia tolerance in marine organisms, as it demonstrates that marine taxa, which were identified as powerful acid-base regulators during hypercapnic challenges, already exhibit strong acid-base regulatory abilities during embryogenesis.

Evolution of extreme stomach pH in bilateria inferred from gastric alkalization mechanisms in basal deuterostomes

The stomachs of most vertebrates operate at an acidic pH of 2 generated by the gastric H+/K+-ATPase located in parietal cells. The acidic pH in stomachs of vertebrates is believed to aid digestion and to protect against environmental pathogens. Little attention has been placed on whether acidic gastric pH regulation is a vertebrate character or a deuterostome ancestral trait. Here, we report alkaline conditions up to pH 10.5 in the larval digestive systems of ambulacraria (echinoderm + hemichordate), the closest relative of the chordate. Microelectrode measurements in combination with specific inhibitors for acid-base transporters and ion pumps demonstrated that the gastric alkalization machinery in sea urchin larvae is mainly based on direct H+ secretion from the stomach lumen and involves a conserved set of ion pumps and transporters. Hemichordate larvae additionally utilized HCO3- transport pathways to generate even more alkaline digestive conditions. Molecular analyses in combination with acidification experiments supported these findings and identified genes coding for ion pumps energizing gastric alkalization. Given that insect larval guts were also reported to be alkaline, our discovery raises the hypothesis that the bilaterian ancestor utilized alkaline digestive system while the vertebrate lineage has evolved a strategy to strongly acidify their stomachs.

Abundance and biomass of macrobenthos in the Black Sea during Mare Nigrum cruise S-RO1

Dataset containing macrobenthos data for samples collected during April 2008 in the North-West Black Sea (between 44°46' - 43°45' N latitude and 30° 11' - 29°35' E longitude). Macrobenthos sampling was done in 4 stations using a 0.14 m**2 Van Veen grab. Washing of the sample through two sieves - 1 mm and 0.25 mm mesh size; the material retained by the two sieves was examined at the binocular microscope; all animals were extracted, using fine tweezers and the species or group of species were identified and counted (in order to determine the density of populations); the larger organisms were measured and weighed (structure and biomass); for smaller organisms, the average wet weights inscribed in standard tables were used to calculate the biomass. Taxonomic identification was done at the GeoEcoMar by A. Teaca and T. Begun using the relevant taxonomic literature (Key-book for the identification of the Black Sea and Sea of Azov Fauna, 1968 -1972, Kiev - in Russian, V 1-4; BACESCU, M.C., MÜLLER, G. I., GOMOIU, M.-T., 1971 and BACESCU, M.C., MÜLLER, G. I., GOMOIU, M.-T., 1971-Benthic ecological research to Black Sea. Comparative quantitative and qualitative analyse of pontic benthic fauna. Marine Ecology, 4, 1-357 (in Romanian).