Search results for "BT"

Le domande computer-based dell'indagine OCSE-Pisa e le domande INVALSI: uno studio sperimentale sul confronto tra i due strumenti di somministrazione

2016

Le valutazioni standardizzate stanno orientandosi verso la somministrazione computer-based; in quest'ottica, la ricerca si è concentrata principalmente sull'analisi della comparabilità dei risultati e sullo studio delle eventuali differenze nelle performance degli allievi dovuti al passaggio ad un nuovo ambiente di somministrazione. Tale passaggio è tutt’altro che neutro. Questo articolo presenta la prima fase di una ricerca più ampia che si propone di indagare in maniera analitica le differenze di comportamento di studenti coinvolti nella risoluzione di test somministrati in ambiente cartaceo e computerizzato. L’obiettivo è definire e validare degli strumenti di analisi che permettano di e…

Desarrollo de métodos analíticos para evaluar la efectividad de cosméticos antipolución

2021

La contaminación ambiental es un problema tanto local como global de gran importancia en la actualidad. En concreto, la contaminación urbana es uno de los principales peligros para la salud humana, y en especial para la salud de la piel, lo que ha provocado un incremento de la concienciación y la preocupación con respecto a los niveles de contaminación en aire. La aparición de cosméticos antipolución, destinados a combatir estos efectos negativos sobre la salud humana, es el resultado de dicha preocupación. Sin embargo, el desarrollo de metodologías analíticas adecuadas para la evaluación de su efectividad es un gran desafío. Por ello, la presente Tesis se centra en el desarrollo de métodos…

Money for the Issuer: Liability or Equity?

2021

Abstract This study analyzes the nature of money through the lens of the international principles of accounting and lays the foundations of what it calls the accounting view of money (AVM). Using international accounting principles, the AVM argues that the fiat monies issued by the state (typically, cash, banknotes, and central bank money) are not debt and that in fractional reserve regimes, only a share of commercial bank money can be regarded as debt. The AVM argues, instead, that state monies and the nondebt share of commercial bank money are net wealth of their holders and net worth (equity) of their issuers and determines how the seigniorage associated with money issuance should be acc…

Free radical scavenging capability, antioxidant activity and chemical constituents of Pyrola incarnata Fisch. leaves

2013

Abstract In the present study, the crude extract and its four fractions of petroleum ether, ethyl acetate, n-butanol, water from Pyrola incarnata Fisch. leaves were prepared and their antioxidant activities were investigated by using four antioxidant assays in vitro. The ethyl acetate fraction showed remarkably strong antioxidant activities on 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging, ABTS radical scavenging, reducing power and β-carotene-linoleic acid bleaching, which were almost comparable to capacities of the positive controls (VC and BHT). The ethyl acetate fraction had the highest total phenolic and total flavonoid contents. Furthermore, Pearson correlation analysis was …

ERA-experiment “space biochemistry”

1995

Abstract The general goal of the experiment was to study the response of anhydrobiotic (metabolically dormant) microorganisms (spores of Bacillus subtilis, cells of Deinococcus radiodurans, conidia of Aspergillus species) and cellular constituents (plasmid DNA, proteins, purple membranes, amino acids, urea) to the extremely dehydrating conditions of open space, in some cases in combination with irradiation by solar UV-light. Methods of investigation included viability tests, analysis of DNA damages (strand breaks, DNA-protein cross-links) and analysis of chemical effects by spectroscopic, electrophoretic and chromatographic methods. The decrease in viability of the microorganisms was as exp…

Direct Solid Phase Microextraction for the Determination of BTEX in Water and Wastewater

1996

UJI AKTIVITAS ANTIBAKTERI DARI ESTRAK TUMBUHAN AKWAY (Drimys beccariana. Gibbs)

2010

<p><em>The plant Akway (Drimys beccariana.</em>Gibbs<em>) is endemic to Papua and is frequently used traditionally by the Arfak tribe as a medicinal plant. We extract the plant by maceration with ethanol. The antibacterial test  is done by Agar diffusion method. As microba test  we used Escheresia coli and Bacillus subtilis. Result obtained from fitochemistry skrinning of the leaf and bark contained alkaloid, flavonoid, steroid, tannin, glikosida, saponin, triterpenoid, steroid and  fenolik. Concentration of active substances from the leaf are flavonoid (0,3680%) and tanin (10.33 %); while from the bark flavonoid 18.35%  and tanin (27.65%).  Antibacterial test showed…

A Radical Signal Activates the Epigenetic Regulation of Longevity

2013

Hormesis is an adaptive stress response implicated in longevity regulation. Schroeder et al. (2013) have now connected stress, epigenetic changes, and aging in yeast by showing that mitochondria-derived reactive oxygen species modulate the chromatin binding capacity of the histone demethylase Rph1p at subtelomeres, resulting in lifespan extension.

Interactions between 2-Aminobenzothiazole and Natural Organic Matter as Evidenced by CPMAS Nitrogen-15 NMR Spectroscopy

2009

Cross-polarization magic angle spinning (CPMAS) 15N nuclear magnetic resonance (NMR) spectroscopy was used to study the interactions between 2-aminobenzothiazole (ABT) and natural organic matter in the presence of the natural enzyme laccase and synthetic air. Through the use of synthesized model compounds, we were able to confirm previous findings by CPMAS 13C NMR spectroscopy that showed the formation of covalent amide bonds. We also provide evidence of the presence of two additional H bonds between ABT and the natural organic matter. Both H bonds involved the amino and thiazole groups of ABT.

Chemical and acidic composition of Longissimus dorsi muscle of Comisana lambs fed with Trifolium subterraneum and Lolium multiflorum

2010

Aim of this study was to evaluate the effects of grazing on Trifolium subterraneum and Lolium multiflorum, as pure or associated crops, on the chemical composition and on the fatty acid profile of the intramuscular lipids of the meat of lambs. Forty Comisana male lambs, on average weighing 13.75±1.90 kg, were divided into four homogenous groups of ten and called, in relation to the diet: group T those grazing on T. subterraneum; Group L on L. multiflorum; Group TL on adjacent monocultures of T. subterraneum and L. multiflorum (66.6 and 33.3% of surface, respectively); Group LT on adjacent monocultures of T. subterraneum and L. multiflorum (33.3 and 66.6% of surface, respectively). Every 10 …