1,354,072 research outputs found

    Un limes bizantino nel Salento? La frontiera bizantino-longobarda nella Puglia meridionale. Realtà e mito del "limitone dei greci"

    No full text
    National audienceD'après une tradition historiographique, une fortification linéaire continue aurait été érigée par les Byzantins, afin de faire obstacle à l'avancée lombarde en Pouille méridionale (Salento), au VIIe siècle. Alors que la recherche archéologique contemporaine a rendues caduques nombre d'autres anciennes théories, le "limitone dei greci" reste accrédité par des publications récentes. Néanmoins, l'idée d'un "limes byzantin du Salento" semblerait s'appuyer davantage sur des archétypes théoriques que sur de véritables données archéologiques

    Miglioramento della micropropagazione e radicazione ex vitro di gelso nero, accessione “Fontanarossa nera”

    No full text
    Il gelso (Morus spp.) è una pianta arborea da frutto di elevata importanza economica e viene di solito propagato per talea o per innesto. La micropropagazione rappresenta ad oggi la strategia migliore per una moltiplicazione rapida per la produzione di materiale sano. In questo studio è stato ottimizzato un protocollo di moltiplicazione, radicazione ex vitro e acclimatazione per il genotipo “Fontanarossa nera” (Morus nigra L.). È stato studiato l’effetto dei sali minerali di Murashige e Skoog (MS), Woody Plant Medium (WPM) e Driver e Kuniyuki Walnut Medium (DKW), e di diverse concentrazioni di citochinine quali la 6-benzilamminopurina (BAP) e la [6-(3-hydroxybenzylamino) purina] (meta-topolina - mT). I germogli così ottenuti sono stati sottoposti a radicazione ex-vitro, valutando l’effetto di due diverse illluminazioni LED (Valoya LED Grow Lights, Valoya Oy, Helsinki Finland): G2, ricca in rosso e rosso lontano, e NS1, ricca in blu e verde

    Response of Lactobacillus helveticus PR4 to Heat Stress during Propagation in Cheese Whey with a Gradient of Decreasing Temperatures

    No full text
    The heat stress response was studied in Lactobacillus helveticus PR4 during propagation in cheese whey with a gradient of naturally decreasing temperature (55 to 20°C). Growth under a gradient of decreasing temperature was compared to growth at a constant temperature of 42°C. Proteinase, peptidase, and acidification activities of L. helveticus PR4 were found to be higher in cells harvested when 40°C was reached by a gradient of decreasing temperature than in cells grown at constant temperature of 42°C. When cells grown under a temperature gradient were harvested after an initial exposure of 35 min to 55°C followed by decreases in temperature to 40 (3 h), 30 (5 h 30 min), or 20°C (13 h 30 min) and were then compared with cells grown for the same time at a constant temperature of 42°C, a frequently transient induction of the levels of expression of 48 proteins was found by two-dimensional electrophoresis analysis. Expression of most of these proteins increased following cooling from 55 to 40°C (3 h). Sixteen of these proteins were subjected to N-terminal and matrix-assisted laser desorption ionization-time of flight mass spectrometry analyses. They were identified as stress proteins (e.g., DnaK and GroEL), glycolysis-related machinery (e.g., enolase and glyceraldehyde-3-phosphate dehydrogenase), and other regulatory proteins or factors (e.g., DNA-binding protein II and ATP-dependent protease). Most of these proteins have been found to play a role in the mechanisms of heat stress adaptation in other bacteria

    Perspective: Practical Approach to Preventing Subclinical B12 Deficiency in Elderly Population.

    No full text
    Vitamin B12 (also known as cobalamin) is an essential water-soluble vitamin that plays a pivotal role for several physiologic functions during one’s lifespan. Only certain microorganisms are able to synthetize B12, thus humans obtain cobalamin exclusively from their diet, specifically from animal-derived foods. Specific sub-group populations are at risk of vitamin B12 subclinical deficiency due to different factors including poor intake of animal source foods and age-dependent decrease in the capacity of intestinal B12 uptake. Consumption of animal products produces some negative health issues and negatively impacts sustainability while a plant-based diet increases the risk of B12 deficiency. Taking a cue from the aforementioned considerations, this narrative review aims to summarize facts about B12 deficiency and the burden of inadequate dietary intake in elderly population, as well as to discuss sustainable approaches to vitamin B12 deficiency in aging population

    Un limes bizantino nel Salento? La frontiera bizantino-longobarda nella Puglia meridionale. Realtà e mito del "limitone dei greci"

    No full text
    National audienceD'après une tradition historiographique, une fortification linéaire continue aurait été érigée par les Byzantins, afin de faire obstacle à l'avancée lombarde en Pouille méridionale (Salento), au VIIe siècle. Alors que la recherche archéologique contemporaine a rendues caduques nombre d'autres anciennes théories, le "limitone dei greci" reste accrédité par des publications récentes. Néanmoins, l'idée d'un "limes byzantin du Salento" semblerait s'appuyer davantage sur des archétypes théoriques que sur de véritables données archéologiques

    Going Beyond Counting First Authors in Author Co-citation Analysis

    No full text
    The present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed

    Un limes bizantino nel Salento? La frontiera bizantino-longobarda nella Puglia meridionale. Realtà e mito del "limitone dei greci"

    No full text
    National audienceD'après une tradition historiographique, une fortification linéaire continue aurait été érigée par les Byzantins, afin de faire obstacle à l'avancée lombarde en Pouille méridionale (Salento), au VIIe siècle. Alors que la recherche archéologique contemporaine a rendues caduques nombre d'autres anciennes théories, le "limitone dei greci" reste accrédité par des publications récentes. Néanmoins, l'idée d'un "limes byzantin du Salento" semblerait s'appuyer davantage sur des archétypes théoriques que sur de véritables données archéologiques
    corecore