Search results for "iron [calorimeter]"

CMR 2005: 12.06: Ultra-small iron oxide nanoparticle (USPIO)-labeled baculoviruses as novel MRI agents for imaging viral vector biodistributionin vivo

2006

Iron isotope signature of magnetofossils and oceanic biogeochemical changes through the Middle Eocene Climatic Optimum.

2021

21 pages; International audience; Magnetotactic bacteria (MTB) intracellularly precipitate magnetite (Fe3O4) crystals that can be preserved in the geological record. When MTB die, the so-called magnetofossils constitute valuable proxies for paleoenvironmental reconstructions and are suspected to represent some of the oldest traces of biomineralization on Earth. Yet, the biogenicity of putative magnetofossils found in ancient terrestrial and extra-terrestrial samples is still largely debated and their significance for past climate still holds uncertainties. Here we studied a sedimentary sequence from the Indian Ocean (ODP Hole 711A) recording the Middle Eocene Climatic Optimum (MECO) through…

The [Fe(etz)6](BF4)2 Spin-Crossover System - Part Two: Hysteresis in the LIESST Regime

1996

In the [Fe(etz)6](BF4)2 spincrossover system the iron(II) complexes occupy two nonequivalent lattice sites, sites A and B. Complexes on site A show a thermal high-spin (HS) low-spin (LS) transition at 105 K, whereas complexes on site B remain in the HS state down to 10 K. Complexes on both sites exhibit light-induced spin state conversions (LIESST) at 20 K: LS HS on site A with = 514.5 nm, and HS LS on site B with = 820 nm. The relaxation processes subsequent to the HS LS conversion on site B reveal a light-induced HSLS bistability for the complexes on site B at 70 K. The bistability as well as the absence of a thermal spin transition on site B are attributed to a thermal hysteresis for the…

Structural and functional characterization of enamel pigmentation in shrews.

2013

Pigmented tooth enamel occurs in several vertebrate clades, ranging from mammals to fish. Although an iron compound is associated with this orange to red colored pigmentation, its chemical and structural organization within the enamel is unknown. To determine the nature of the iron compound, we investigated heavily pigmented teeth of the northern short-tailed shrew Blarina brevicauda using combined characterization techniques such as scanning and transmission electron microscopy and synchrotron X-ray diffraction. We found that the pigmentation of the enamel with an iron content of around 8wt% results from a close to amorphous magnetite phase deposited around the nm-sized enamel crystals. Fu…

Anti-oxidative effects and harmlessness of asymmetric Au@Fe3O4 Janus particles on human blood cells

2014

AbstractThe physical properties of asymmetric Janus particles are highly promising for future biomedical applications. However, only a few data is available on their biological impact on human cells. We investigated the biological impact of different Au@Fe3O4 Janus particle formulations in vitro to analyse specific uptake modalities and their potential cytotoxic effects on human cells of the blood regarding intravenous injection. We demonstrate that Au@Fe3O4 Janus particles exhibit a similar or even better biocompatibility compared to the well-studied spherical iron oxide nanoparticles. The impact of Janus particles on cells depends mainly on three factors. (1) Surface functionalization: NH…

Territories, identities and strategies in Forez from the sixth at the first front millenium BC in the upstream basin of the Loire (France)

2007

This thesis heading Territories, identities and strategies in Forez from the sixth at the first front millenium BC in the upstream basin of the Loire, relates to an extent in the north-Eastern part of the Massif central in contact with the Rhodanian corridor. This intramontane sector (current department of Loire 42) has allowed to build a consequent archaeological corpus which clarified behaviors having strong socio-economic and environmental implications. The archaeological study called upon various disciplines: agronomy, anthropology, archeometry (palynology, dating 14C, etc.), ceramology, geography, geomorphology, petrography, sedimentology, volumetry. It recuts several sets of themes : …

The Origins of Millet Cultivation (Panicum miliaceum and Setaria italica) along Iberia’s Mediterranean Area from the 13th to the 2nd Century BC

2023

The introduction of the cultivation of millets (Panicum miliaceum and Setaria italica) along Iberia’s Mediterranean zone appears to stem from different origins which themselves hinged on their own specific historical developments. The earliest traces in the northeast, presumably of trans-Pyrenean origin, were brought to light in Bronze Age contexts (13th century BC) in Western Catalonia, notably in the Cinca River Valley. The different species of millets from southern and eastern Iberia, by contrast, come from later 10th–8th century BC contexts under Phoenician influence. Their expansion can be linked to the cultivation of fruit trees (vineyards and others) throughout the 9th–7th centuries …

"Résumé de thèse, Le Forez du VIe au Ier millénaire av. J.-C. Territoires, identités et stratégies des sociétés humaines du Massif central dans le ba…

2009

Summary of thesis: Forez from the sixth to the first front millennium BC, Territories, identities and strategies of human societies in the upstream basin of the Loire (France) by Vincent GEORGES defended on 20th December 2007 at the University of Bourgogne; Joëlle Burnouf (reporter), Hervé Cubizolle (co-dir.), José Gomez de Soto (chair), Vincent Guichard (exam.), Claude Mordant (dir.), Pierre Pétrequin (reporter). This thesis is available online on www.tel.archives-ouvertes.fr.

Cartographie des restes osseux et conservation différentielle dans l'amas coquillier d'Ouessant "Mez Notariou": du Bronze moyen à la période romaine

2008

This article addresses the impacts of differential preservation in an alkaline shell midden (fig. 1) overlying an acid soil which does not allow bone to survive. This midden accumulated over an extended period and displays unusual traits attributable to practices of a ritual nature (Le Bihan et Méniel, 2002). Excavation extended to approximately 1000 square metres (fig. 2). Bone was collected on a quarter-metre grid by individual context (fig. 3). Some 35,000 animal and bird bones were recovered; fish bones, which were very numerous, are presently still under study. Consideration of the entire bone assemblage (fig. 8) indicates that the principal deposition occurred along the SW/NE axis of …

ArchaeDyn. Dynamique spatiale du peuplement et ressources naturelles : vers une analyse intégrée dans le long terme, de la Préhistoire au Moyen Âge,.…

2008

Rapport de fin de contrat d'ACI