Search results for "MARS"

The last sinkhole at Marsala: the 21 November, 2013,event

2014

Marsala area, in the western end of Sicily, has been historically interested by quarry activities, both at surface and underground. The carved rocks are Lower Pleistocene calcarenites, defined as “Calcarenite di Marsala” and referred to the Marsala syntheme. These calcarenites are composed of three main lithofacies with vertical and lateral passages: a)coarse to fine yellow bio- and lithoclastic calcarenites, rich in macrofossils; b) sands; and c) gray sandy clays. According to previous authors, the calcarenitic lithofacies can be divided into three lithotypes: i) coarse calcarenites and calcirudites strata, from 10 to 100 cm thick; ii) fine to coarse calcarenites with thickened grains; iii…

Translation and terminology. On two Spanish versions (Madrid, 1800) of Dumarsais’ Logique

2013

This article is the Spanish version of “Traduction et terminologie. A propos de deux versions espagnoles (Madrid, 1800) de la Logique de Dumarsais” by Brigitte Lépinette. It was not published on the print version of MonTI for reasons of space. The online version of MonTI does not suffer from these limitations, and this is our way of promoting plurilingualism. Framed in the field of philosophical translation (lato sensu), this article deals with two different versions of Logique by Dumarsais (Paris, 1730) published in Spain. We show that these two “Lógicas”, translated by two different persons, who also had distinct purposes as is evidenced by their respective bibliographical context and met…

The space age and the origin of space research

2001

The exploration of space is one of the greatest achievements of the twentieth century. In the ideal photo album of this century one could hardly avoid including such pictures as our blue planet seen from space and the human footprint on the Moon’s surface; the close-up images of a comet’s nucleus and the rough landscape of Mars; the floating of astronauts in the black vacuum around a space station and the rings of Saturn photographed from an approaching spacecraft.

Field-portable Mössbauer spectroscopy on Earth, the Moon, Mars, and beyond

2011

ABSTRACT Iron occurs naturally as Fe 2+ , Fe 3+ , and, to a lesser extent, as Fe 0 . Many fundamental (bio)geochemical processes are based on redox cycling between these oxidation states. Mossbauer spectroscopy provides quantitative information about the distribution of Fe among its oxidation states, identification of Fe-bearing phases, and relative distribution of Fe among those phases. Portable, miniaturised Mossbauer spectrometers were developed for NASA9s Mars Exploration Rovers (in operation since 2004) and provide a means for non-destructive, in-situ field investigations. On Mars, these instruments provided evidence for aqueous activity with implications for habitability, were applied…

THE ITALIAN DEBATE ON MARSHALLIAN AND PARETIAN ECONOMICS AND THE INTELLECTUAL ROOTS OF PIERO SRAFFA'S 'Sulle relazioni fra costo e quantità prodotta'…

2000

La critica di Piero Sraffa alla teoria marshalliana del valore negli anni venti. Una prospettiva metodologica

1998

Il saggio intende ricostruire la logica della ricerca scientifica del giovane Sraffa così come essa emerge dall'analisi degli articoli del 1925-26. I risultati che emergono si possono così riassumere. La critica di Sraffa alla teoria marshalliana del valore non è una critica di tipo logico in senso stretto: il che muove Sraffa non è quello di mettere in luce l'esistenza di alcuni non sequitur all'interno della costruzione teorica marshalliana; bensì di dimostrare che la portata empirica del modello marshalliano, una volta ricostruito in modo logicamente coerente, è ben più ristretta diquanto generalmente ammesso.

Hallazgo de un denario merovingio inédito de Marsella en la ciudad de Tarragona (España)

2019

Documentamos el importante descubrimiento de un denario merovingio procedente de Masilia (Marsella) en la ciudad catalana de Tarragona (España). Debido a la escasez de esta tipología, no solamente en el suelo peninsular, creemos que su publicación es de una gran importancia. Y más aún considerando que el estudio de las relaciones comerciales tanto de corto como de largo recorrido entre el reino visigodo de Toledo y la Francia merovingia se mantiene poco desarrollado. We study the important fi nding of a Merovingian denarius from Masilia (Marseille) in the Catalan city of Tarragona (Spain). Due to the scarcity of this coinage, not only in the Iberian Peninsula, we believe that its publicatio…

Raman-Mössbauer-XRD studies of selected samples from “Los Azulejos” outcrop: A possible analogue for assessing the alteration processes on Mars

2016

The outcrop of “Los Azulejos” is visible at the interior of the Cañadas Caldera in Tenerife Island (Spain). It exhibits a great variety of alteration processes that could be considered as terrestrial analogue for several geological processes on Mars. This outcrop is particularly interesting due to the content of clays, zeolite, iron oxides, and sulfates corresponding to a hydrothermal alteration catalogued as “Azulejos” type alteration. A detailed analysis by portable and laboratory Raman systems as well as other different techniques such as X ray diffraction (XRD) and Mössbauer spectroscopy has been carried out (using twin-instruments from Martian lander missions: Mössbauer spectrometer MI…

Glucosylation of Rho proteins by Clostridium difficile toxin B.

1995

TOXIN A and B, the major virulence factors of Clostridium difficile, are the causative agents of antibiotic-associated pseudomembran-ous colitis. In cultured cell lines their potent cytotoxicity results from their ability to induce disaggregation of the microfilament cytoskeleton1,2. Toxin B acts on the low-molecular-mass GTPase Rho A3,4, which is involved in the regulation of the actin cytoskeleton. We report here that toxin B catalyses the incorporation of up to one mole of glucose per mole of RhoA at the amino acid thre-onine at position 37. The modification was identified and localized by tandem electrospray mass spectrometry. UDP-glucose selectively serves as cosubstrate for the monogl…

Predicting gully occurrence at watershed scale: Comparing topographic indices and multivariate statistical models

2020

In this study, the ability of five topographic indices to predict the gully trajectories observed in two adjacent watersheds located in Sicily (Italy) was evaluated. Two of these indices, named MSPI and MTWI, as far as we know, have never been employed to this aim. They were obtained by multiplying the stream power index (SPI) and the topographic wetness index (TWI), respectively, by the convergence index (CI). The predictive ability of the topographic indices was measured by using both cut-off independent (AUC: area under the receiver operating characteristic curve) and dependent statistics (Cohen's kappa index κ, sensitivity, specificity). These statistics were calculated also for 100 MAR…