Search results for " burning"

Origin of atmospheric lead in Johannesburg, South Africa

2006

International audience; The origin of lead in the atmosphere of Johannesburg, South Africa was investigated on the basis of elemental and lead isotopic analyses of coals, mine dumps, gasoline, and about 30 epiphytic lichen samples. Lead predominantly comes from automotive exhausts in urban and suburban areas, as leaded antiknock additives were still in use in South Africa at the time of the study. Although dust emissions from the numerous mine-tailing dumps were expected to contribute significantly to the heavy metal budget, the southern townships that are surrounded by the dumps (such as Soweto and other historically Black residential areas) do not appear to be more than partially influenc…

Spectral hole burning study of protoporphyrin IX substituted myoglobin.

1992

Protoporphyrin IX substituted myoglobin reveals excellent hole burning properties. We investigated the frequency shift of persistent spectral holes under isotropic pressure conditions in a range from 0 to 2.4 MPa. In this range, the protein behaves like an elastic solid. The shift of the holes under pressure shows a remarkable frequency dependence from which the compressibility of the protein can be determined. The compressibility, in turn, allows for an estimation of the equilibrium volume fluctuations. Within the frame of the model used to interpret the pressure data, it is possible to determine the absorption frequency of the isolated chromophore and the associated solvent shift in the p…

Gli specchi argentati della Collezione Storica degli Strumenti di Fisica dell’Università di Palermo

2021

Nell'articolo presenteremo tre strumenti scientifici di particolare interesse storico-didattico appartenenti alla Collezione Storica degli Strumenti di Fisica dell'Università di Palermo: uno specchio convesso risalente molto probabilmente all'inizio del XIX secolo e una coppia di specchi ustori risalenti molto probabilmente alla metà del XIX secolo. Dopo un'introduzione sullo sviluppo storico degli specchi e il loro principio di funzionamento, descriveremo le caratteristiche fisiche degli strumenti della collezione e gli interventi effettuati. In the paper we will describe three instruments of particular historical and didactic interest belonging to the Historical Collection of Physics Inst…

Homicide or suicide? An unusual death of a man suspected of sexual harassment in family context

2011

The authors describe a case of a man found carbonized in a burnt car. The man was suspected of sexual harassment in family context. Forensic exhamination helped to distinguish between homicide and suicide hypothesis.

Cross-hemispheric transport of central African biomass burning pollutants: implications for downwind ozone production

2010

Pollutant plumes with enhanced concentrations of trace gases and aerosols were observed over the southern coast of West Africa during August 2006 as part of the AMMA wet season field campaign. Plumes were observed both in the mid and upper troposphere. In this study we examined the origin of these pollutant plumes, and their potential to photochemically produce ozone (O<sub>3</sub>) downwind over the Atlantic Ocean. Their possible contribution to the Atlantic O<sub>3</sub> maximum is also discussed. Runs using the BOLAM mesoscale model including biomass burning carbon monoxide (CO) tracers were used to confirm an origin from central African biomass burning fires. The…

Modelling the optical properties of fresh biomass burning aerosol produced in a smoke chamber: results from the EFEU campaign

2007

A better characterisation of the optical properties of biomass burning aerosol as a function of the burning conditions is required in order to quantify their effects on climate and atmospheric chemistry. Controlled laboratory combustion experiments with different fuel types were carried out at the combustion facility of the Max Planck Institute for Chemistry (Mainz, Germany) as part of the "Impact of Vegetation Fires on the Composition and Circulation of the Atmosphere" (EFEU) project. The combustion conditions were monitored with concomitant CO<sub>2</sub> and CO measurements. The mass scattering efficiencies of 8.9±0.2 m<sup>2</sup> g<sup&gt…

Studio del ruolo dell'infiammazione neuro-mediata e di NFK-B nell'etiopatogenesi della burning mouth syndrome.

2011

Rtęć w surowcach do produkcji cementu i pyłach powstających w tym procesie

2010

Burning mouth syndrome (BMS) : evaluation of thyroid and taste

2006

Background Burning mouth syndrome (BMS) is a chronic, intraoral burning sensation seen mainly in middle-aged and post-menopausal females, without identifiable oral lesions or abnormal laboratory findings, but often associated with psychogenic disorders such as depression. The latter can have a range of causes, including hormonal. Objective Since there may be connections between BMS, psychogenic changes, hormonal changes and taste abnormalities , we have examined aspects of taste and thyroid function.. Patients and methods We selected 50 patients with BMS (study group) and 50 healthy subjects (control group) and analysed their ability to taste bitter, acid and spicy substances and analysed t…