Search results for "SAC"
showing 10 items of 3337 documents
The Antiviral Activity of Bacterial, Fungal, and Algal Polysaccharides as Bioactive Ingredients: Potential Uses for Enhancing Immune Systems and Prev…
2021
Viral infections may cause serious human diseases. For instance, the recent appearance of the novel virus, SARS-CoV-2, causing COVID-19, has spread globally and is a serious public health concern. The consumption of healthy, proper, functional, and nutrient-rich foods has an important role in enhancing an individual's immune system and preventing viral infections. Several polysaccharides from natural sources such as algae, bacteria, and fungi have been considered as generally recognized as safe (GRAS) by the US Food and Drug Administration. They are safe, low-toxicity, biodegradable, and have biological activities. In this review, the bioactive polysaccharides derived from various microorga…
An Example: Money
1995
The institution of money, like that of language, or that of the State, has often been seen to be based on some kind of contractual agreement. Aristotle describes the nature of money as follows: Money has become by convention a sort of representative of demand; and that is why it has the name ‘money’ (nomisma) because it exists not by nature but by law (nomos) and it is in our power to change it and make it useless. (Ethica Nicomachea, V.5.II33a) The word nomos is ambiguous: in another translation of Ethica it has been translated as “custom”. This ambiguity reflects a theoretical problem in the classical social theory: money has been seen either as a result of an act of will of the legislato…
E-selectin modulates the malignant properties of T84 colon carcinoma cells.
2002
The extravasation of metastatic cells is regulated by molecular events involving the initial adhesion of tumor cells to the endothelium and subsequently the migration of cells in the host connective tissue. E-selectin on endothelial cells and sialyl Lewis X carbohydrate component on tumor cells are mainly involved in the adhesion of colon carcinoma cells to the endothelium of target organ. Interaction of T84 colon cancer cells to purified E-selectin in vitro caused an increase in the tyrosine phosphorylation of a number of proteins as well as the modulation of cellular properties correlated to the metastatic phenotype. Specifically, E-selectin-stimulated actin reorganization, increased coll…
Lymphatic endothelial progenitors bud from the cardinal vein and intersomitic vessels in mammalian embryos.
2012
Abstract The lymphatic vasculature preserves tissue fluid balance by absorbing fluid and macromolecules and transporting them to the blood vessels for circulation. The stepwise process leading to the formation of the mammalian lymphatic vasculature starts by the expression of the gene Prox1 in a subpopulation of blood endothelial cells (BECs) on the cardinal vein (CV) at approximately E9.5. These Prox1-expressing lymphatic endothelial cells (LECs) will exit the CV to form lymph sacs, primitive structures from which the entire lymphatic network is derived. Until now, no conclusive information was available regarding the cellular processes by which these LEC progenitors exit the CV without co…
Credit reporting e intermediazione creditizia: scelte di “make or buy” tra relationship e transaction banking.
2016
Il presente lavoro prende in esame, con una prospettiva di analisi economico-aziendale, il ruolo del mercato del credit reporting nell’esercizio della funzione creditizia delle banche, nonche il vario articolarsi delle scelte di make-or-buy informativo nella catena del valore dell’intermediazione creditizia, tra approcci di relazione di clientela di tipo relationship banking e transaction banking. In particolare, il lavoro e volto a sistematizzare le teorie ed a comprendere le determinanti del ricorso delle banche al mercato dell’informazione creditizia. Il paper e strutturato nel modo seguente. La sezione 2 introduce il tema dell’economia dell’informazione nel mercato creditizio. La sezion…
Les évaluations internationales menées dans les pays pauvres sont-elles fiables ?
2012
National audience; Cet article passe en revue les principales études internationales d'évaluation qui sont menées dans le contexte des pays pauvres, et souligne l'absence d'éléments empiriques permettant d'apprécier le degré d'appariement des tests aux programmes scolaires. A titre d'illustration, nous évaluons la sensibilité d'un test international en comparant les réponses apportées à un même instrument par des élèves qui fréquentent deux années d'études consécutives. En utilisant la méthode du score de propension, qui permet de controler les caractéristiques des élèves et des enseignants, nous montrons que le test est imparfaitement calibré, ce qui remet probablement en cause les conclus…
Évolution de la durée et du tempo dans les enregistrements du Sacre du printemps de Stravinski de 1929 à 2019
2021
Le Sacre du printemps (1913) d’Igor Stravinski est sa première œuvre gravée pour le disque et l’une des plus enregistrées. Tous les plus grands chefs d’orchestre de phalanges internationales, abordant le répertoire d’orchestre du XXe siècle, ont enregistré l’œuvre, certains d’entre eux plusieurs fois au cours de leur carrière. Stravinski qui avait une idée très précise de la façon dont ses œuvres doivent être exécutées, a lui-même effectué quatre enregistrements du Sacre afin d’offrir un modèle à suivre, notamment quant au strict respect des tempi. Cependant, ses propres versions discographiques ne respectent pas toujours les indications de la partition, si bien que leur valeur en tant que …
Transmitting the entrepreneurial spirit to the work team in SMEs: the importance of leadership
2007
PurposeTo establish the extent of the influence of variables which, under a particular style of leadership, form the necessary basis for encouraging and developing group, entrepreneurial activities carried out within the context of small to medium‐sized enterprises (SMEs) thus explaining the transmission of the entrepreneurial spirit to the work team and, consequently, the existence of collective entrepreneurship in the firm.Design/methodology/approachFrom the results of a questionnaire carried out via personal interviews with over 100 firms, a confirmatory factorial analysis was carried out that provided us with the variables to be studied. The cause/effect relationships and their implicat…
Kinetics and metabolism of 14C-lindane and 14C-atrazine in early life stages of zebrafish (Brachydanio Rerio)
1990
Abstract Fertilized eggs, yolk sac larvae, and juveniles of zebrafish were exposed to 14C-lindane and 14C-atrazine under static conditions and the uptake was studied for a period of 48 hours. After 24 hours, a number of animals were transferred into pesticide-free running water and the elimination was examined for another 24 hours. The bioconcentration factors (BCFs) as well as the rate constants for uptake and elimination were calculated. Except for the lindane uptake by eggs and the atrazine uptake by juveniles, the steady state was reached within five hours. For all tested developmental stages the bioconcentration factor of lindane distinctly exceeded 100, whereas it was less than 10 in …
Concentrations of monosaccharides in humic substances in the early stages of humification.
2001
Deteriorated liquid packaging board (LPB) and biowaste compost are matrices, mainly consisting of cellulose, in the early stages of humification. Degradative studies on these matrices allow an examination of the role of carbohydrates in the synthesis of humic substances. Samples of different age were collected and divided by extraction into hot water extract (HWE), bitumen, humic acid (HA), fulvic acid (FA) and humin or residual fibre fractions. The following monosaccharides were identified in these fractions: L-arabinose, D-ribose, D-xylose, L-fucose, D-mannose, D-fructose, D-galactose, D-glucose, L-rhamnose and xylitol. The main component in all fractions was glucose. The concentrations o…