Query : Raman microspectroscopy
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Oxidation of petrogenic organic carbon in the Amazon floodplain as a source of atmospheric CO2
International audience The two long-term sources of atmospheric carbon are CO2 degassing from metamorphic and volcanic activity, and oxidation of organic carbon (OC) contained in sedimentary rocks, or petrogenic organic carbon (OCpetro). The latter fl ux is still poorly constrained. In this study, w...
Structural Iron (II) of Basaltic Glass as an Energy Source for Zetaproteobacteria in an Abyssal Plain Environment, Off the Mid Atlantic Ridge
To explore the capability of basaltic glass to support the growth of chemosynthetic microorganisms, complementary in situ and in vitro colonization experiments were performed. Microbial colonizers containing synthetic tholeitic basaltic glasses, either enriched in reduced or oxidized iron, were depl...
Scheelite-bearing quartz veins from Poblet (Catalonian Coastal Range). Characterization of fluid inclusions and genetic model
Scheelite-bearing quartz veins from Poblet, trending in a NE-SW direction, are hosted by calcic granitoids of Late Hercynian age in the southern part of the Catalonian Coast Range. Fluid inclusions from quartz and scheelite have been characterized using microthermometry, Raman microspectrometry and...
A corrosion study of the ferrous medieval reinforcement of the Amiens cathedral. Phase characterisation and localisation by various microprobes techniques
International audience In this study, long term corrosion mechanisms are approached through the characterisation of corrosion products formed on ancient artefacts over 500 years. Thirty-one artefacts were sampled in the Amiens cathedral. The thick corrosion product layers have been characterised at...
Utilizing Raman spectroscopy and multivariate analysis to identify and monitor the differentiation states of individual stem cells
The rapid progression of stem cell research over several decades has resulted in significant advances in disease treatment, particularly for diseases of the blood and bone marrow. While such treatments are beneficial to thousands of patients every year, mankind has not fully harnessed the therapeuti...
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Characterization of microplastics and anthropogenic fibers in surface waters of the North Saskatchewan River, Alberta, Canada
Microplastics are globally ubiquitous contaminants, but quantitative data on their presence in freshwater environments are sparse. This study investigates the occurrence, composition, and spatial trends of microplastic contamination in the North Saskatchewan River flowing through Edmonton, Alberta,...
Monitoring of the experimental fusion of Melle galene (79) by microspectroscopy Raman
This paper focuses on the study (macroscopic and microscopic) of the transformation of classic silver ore (galena: PbS) and its evolution from a repository produced experimentally in a muffle furnace operating at charcoal. While the chemical reaction that leads from the sulfide lead bullion is ident...
Raman quantification factor calibration for CO-CO2 gas mixture in synthetic fluid inclusions: Application to oxygen fugacity calculation in magmatic systems.
International audience With a combined approach using Solid State 13C-MAS NMR and Laser Raman Microspectroscopy, we investigated the CO2-CO gas composition (X(CO2)) in fluid inclusions synthesised under high pressure (200-300 MPa), high temperature (1225-1250 °C) and reducing conditions (17 < P(H2)...
Natural and synthetic arsenic sulfide pigments in Japanese woodblock prints of the late Edo period
Abstract We recently described the use of an artificial arsenic sulfide pigment in Japanese woodblock prints from the Meiji period (1868–1912): we now expand on our previous work by investigating arsenic sulfide pigments used in Japanese woodblock prints of the late Edo period (1615–1868) and early...
Development of a method of detection and quantification of advanced glycation end-products by Raman spectroscopy.
In the context of an aging population and an increase in age-related chronic diseases, the study of protein non-enzymatic glycation constitutes a topical research axis. Indeed, the advanced glycation products (AGE) play an important role in the complication of age-related diseases such as diabetes....
Ultrahigh-pressure metamorphism of crustal rocks from the Rhodope metamorphic province: evidence from coesite, diamond and majoritic garnet in eclogites and metapelites
The Rhodope Metamorphic Province represents an area of continental collision between the Balkan domain to the north and the Pangaeon domain to the south. Today, exposed astride the suture zone are Palaeozoic and Mesozoic protoliths of both continental and oceanic provenance that underwent Alpine def...
Foliar or root exposures to smelter particles: Consequences for lead compartmentalization and speciation in plant leaves
International audience In urban areaswith high fallout of airborne particles,metal uptake by plantsmainly occurs by foliar pathways and can strongly impact crop quality. However, there is a lack of knowledge on metal localization and speciation in plants after pollution exposure, especially in the c...
Analytical characterization of 5,5′-dibromoindigo and its first discovery in a museum textile
Abstract The exploitation of natural sources and later synthetic molecules to generate blue to purple coloration in textiles has a long history in the dyer’s craft. Natural indigoids such as indigo, woad, and Tyrian or shellfish purple served this purpose for millennia, but in the late 1800s synthet...
Pigments and glassy matrix of the 17 th -18 th century enamelled French watches: A non-invasive onsite Raman and pXRF study
International audience Twelve rare watches with painted enamels, mostly produced in France, from the 17 th and 18 th centuries in the collections of Musée du Louvre in Paris were analyzed on-site in order to characterize the materials used in their enamels and the enamelling technique. All the watch...
New biomarkers of in vitro cell electropermeabilization and ofskin toxicities in cancer patients using non-invasive and label-freeoptical techniques (Raman microspectroscopy and terahertzmicroscopy)
This research work reports the use of various biophotonics techniques to investigate biomedical questions, from basic research (interaction between pulsed electric fields and cells) to clinical studies (skin toxicity induced in patients treated with targeted anticancer therapies).Confocal Raman micr...
Data from: A multiscale vibrational spectroscopic approach for identification and biochemical characterization of pollen
Background: Analysis of pollen grains reveals valuable information on biology, ecology, forensics, climate change, insect migration, food sources and aeroallergens. Vibrational (infrared and Raman) spectroscopies offer chemical characterization of pollen via identifiable spectral features without an...
Thermal behaviour of chlorine in nuclear graphite at a microscopic scale
International audience In this paper, we present the study of thermal behaviour of 36Cl in nuclear graphite used in the St. Laurent A2 UNGG reactor (graphite moderated and CO2 cooled reactor). 37Cl, used to simulate 36Cl displaced from its original structural site by recoil, has been implanted into...
A Multiscale Vibrational Spectroscopic Approach for Identification and Biochemical Characterization of Pollen.
BACKGROUND Analysis of pollen grains reveals valuable information on biology, ecology, forensics, climate change, insect migration, food sources and aeroallergens. Vibrational (infrared and Raman) spectroscopies offer chemical characterization of pollen via identifiable spectral features without any...
Investigation of the Pigments and Glassy Matrix of Painted Enamelled Qing Dynasty Chinese Porcelains by Noninvasive On-Site Raman Microspectrometry
International audience A selection of 15 Chinese painted enameled porcelains from the 18th century (Qing dynasty) was analyzed on-site by mobile Raman and XRF microspectroscopy. The highly prized artifacts are present in the collections of the Musée du Louvre in Paris and Musée Chinois at Fontainebl...
Data from: Spectroscopic analysis of myoglobin and cytochrome c dynamics in isolated cardiomyocytes during hypoxia and reoxygenation
Raman microspectroscopy was applied to monitor the intracellular redox state of myoglobin and cytochrome c from isolated adult rat cardiomyocytes during hypoxia and reoxygenation. The nitrite reductase activity of myoglobin leads to the production of nitric oxide in cells under hypoxic conditions, w...
CARS microspectroscopy applied to monitoring the receptor activation associated with the carcinogenesis
Vibrational microspectroscopy is a rapidly emerging label-free technique that allows the probing of live cell. Thanks to the vibration of the chemical bonds, it makes it possible to locate in the cell biomolecules (proteins, nucleic acids, lipids) associated with organelles. My study consisted in us...
Raman spectroscopy studies of NWA 4039 and NWA 1465 meteorites
Carbonaceous chondrite NWA 1465 and eucrite NWA 4039 were investigated by confocal Raman microspectroscopy to identify the extraterrestrial minerals. Olivines, orthopyroxenes, clinopyroxenes, plagioclase, graphite, magnetite and troilite have been identified and characterized.
Identification of minerals of a new NWA XXX ureilite by Raman spectroscopy
New NWA XXX ureilite found in 2006 was investigated by confocal Raman microspectroscopy to determine mineral composition of the meteorite. Olivines, orthopyroxenes, orthoclase, graphite and diamond have been identified and characterized.
Identification of minerals of NWA 4047 meteorite by Raman spectroscopy
Ordinary chondrite NWA 4047 was investigated by confocal Raman microspectroscopy to identify the extraterrestrial minerals. Olivines, orthopyroxenes, clinopyroxenes, plagioclase, graphite and diamond have been identified and characterized.
Raman spectroscopy investigations of extraterrestrial minerals of certain meteorites
Ordinary chondrites DaG 610 and NWA 869, as well as graphite nodules from Canyon Diablo iron meteorites were investigated by confocal Raman microspectroscopy in order to identify extraterrestrial minerals. Olivines, orthopyroxenes (enstatite, bronzite and hyperstene), clinopyroxenes (pigeonite), pla...