Biomedical subjects
Publications and source records attributed to G Cecchetti.
Daily concentrations of airborne cadmium has been determined for a year in three italian urban areas presenting different characteristics. Results obtained are in the following ranges: Rome, 0,0017--0,0194 micrograms/m3; Venice, 0,0012--0,2234 micrograms/m3 and Marghera, 0,0037--0,704 micrograms/m3. Some data for urban inciniretors emissions are also presented. Origin, effects and legislation concerning airborne cadmium are briefly discussed.
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The method for the determination of free crystalline silica (quarts), as previously described by two of the authors, has been employed on atmosphere dust of unconfined spaces. The matrix effect of atmospheric dust has been investigated in winter and in summer. The limits in the use of this method have been studied considering also what stated by law code n. 615. The results obtained on the outdoor atmospheric dust, samples from industrial as well as suburban areas, are reported. The results are evaluated in relation to the metereological records.
Some automatic sample-collecting sets for measuring the ponderal concentration of dust have been tested. Such apparatuses are based on two different principles: beta ray absorption, and Tyndall effect. It is shown how, through the beta absorption apparatus, it is also possible to carry out absolute measurements, after evaluating obviously the possible matrix effects. Furthermore it is shown how the sample-collecting sets, based on Tyndall effect, open new prospects in their employement on machinery drainage processes, or in following the behaviour of dust phenomena. The two types of apparatus thus tested integrate each other, where an automatic control, particularly in working environments, is needed.
The results of the noise measurements obtained in three foundries, two of cast-iron and one of aluminium, are reported. Because of noise level variations, a level recorder and a statistical distribution analyzer have been used in addition to a sound level meter, and thus equivalent continuous sound levels (Leq) both with factor q = 3 (European Code) and with factor q = 5 (OSHA) have been calculated. The results obtained with these two different criteria of evaluation are discussed.
The mercury control in the chloroalkali plants is a "routine method". The air is above all sampled in the chloroalkali electrolysis rooms and in the rooms under them. Already in a previous paper we had pointed out a method for the sampling and determination of the metallic mercury in these work rooms. Atmospheric samples are passed through a small glass tube containing fine spongy particles of metallic gold. As far as particle mercury sampling and analysis are concerned, environmental air is filtered by micropore filters placed on the top of the small tube filled with the gold sponge (on the same sampling line). The present work has been made with the purpose of verifying the percentage of metallic and particle mercury of the chloroalkali plants and nearby the industrial perimeter of these plants. The results have been obtained from data of two plants with different capacity, different topographic location and different microclimatic conditions. It has been noticed that the air concentration of mercury in the surrounds of the plants is higher than the basal values in incontaminated areas and the ratio between metallic mercury and particle mercury in the surroundings of chloroalkali plants is casual. The obtained data have been explained at the light of the microclimatic observations and exactly: speed and direction of winds, temperature, humidity and rainy precipitations.
A new method for the determination of urinary lead by means of the emission spectroscopy is described. The sample is concentrated by lyophilization and the homogeneous dust obtained is analysed using the "double arc" method. The matrix effects and the source unstability are compensated by the use of the internal standard. The influence of the volatilization of the elements of the analytical pairs are studied and the pair thallium-lead is selected. The method is reproducible and the detection limit is 5 microgram/l of urinary lead.
In outdoor factory environments many defiling substances are produced by different working processes. Reclamation operations must, therefore, be directed to the single types of pollution involved. A series of corrective operations, aiming at the elimination of fumes, frinding powders, solvent vapours, paint pigments and hydrocarbon vapours, are described.
In this work the authors describe a weaving work room where they had determined particulate oil aerosol above TLV. The reduction of the oil aerosol has been obtained with the construction of an extraction and immission air suitable system.
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1. (+)-Amphetamine sulphate elicits a dose-dependent hyperthermia in NMRI mice but it does not significantly increase the body temperature of C(3)H mice.2. When low doses of (+)-amphetamine are given, the body temperature of C(3)H mice decreases.3. (+)-Amphetamine decreases the noradrenaline concentration in the brain-stem and increases the homovanillic acid concentration (HVA) in the striatum of NMRI mice, but only slightly reduces the noradrenaline concentration and does not change the HVA concentration in the brains of C(3)H mice.4. The two strains appear to show a difference in the metabolism of dopamine in the striatum. The rates at which dopamine disappears from the tissue after blocking catecholamine synthesis with alpha-methyltyrosine and the rates at which HVA accumulates after blocking the active transport of this metabolite out of the brain with probenecid suggest that the turnover of dopamine is lower in C(3)H mice than in NMRI mice.
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