Evaluation of the Photocatalytic Activity of a Cordierite-Honeycomb-Supported TiO2 Film with a Liquid-Solid Photoreactor.

Anatase nanoparticles in suspension have demonstrated high photoactivity that can be exploited for pollutant removal in water phases. The main drawback of this system is the difficulty of recovering (and eventually reusing) the nanoparticles after their use, and the possible interference of inorganic salts (e.g., sulfates) that can reduce the performance of the photocatalyst. The present work describes the development of a cordierite-honeycomb-supported TiO2 film to eliminate the problems of catalyst recovery. The catalyst was then tested against phenol in the presence of increasing concentrations of sulfates in a specially developed recirculating modular photoreactor, able to accommodate the supported catalyst and scalable for application at industrial level. The effect of SO42- was evaluated at different concentrations, showing a slight deactivation only at very high sulfate concentration (≥3 g L-1). Lastly, in the framework of the EU project Project Ô, the catalyst was tested in the treatment of real wastewater from a textile company containing a relevant concentration of sulfates, highlighting the stability of the photocatalyst.

[Algorithms for the evaluation of chemical risk: the Piedmont Region's experience]. / Gli algoritmi per la valutazione del rischio chimico: l'esperienza della Regione Piemonte.

The programme InfoRisk, proposed by the Piedmont Region in 2002, has been an important reference point for the evaluation of chemical risk, both for companies and the regional prevention system alike. Nowadays, it is still considered necessary to take advantage of simple methods for the evaluation of this risk. However, the Piedmontese model requires some modification so as to keep it in line with the national and international rules and regulations governing the question and to find some solutions to problems that have arisen in its practical application. Most of these problems are tied to the use of the section of the evaluation technique, which is base on the estimate and not on the measurement of the exposure. Indeed, it has been confirmed in some cases that it is not possible to discard a more accurate evaluation which is not only able to make a correct application of the scientific evidence available in a correct manner, but also one that is supported by environmental monitoring campaigns. The main modifications proposed to the model are herein presented. The Work Group has endeavoured to maintain, whenever possible, the previous logic processes of the algorithm, so as to conserve its "user friendly" aspects and clarity that have so often been reported and appreciated by the operators who applied it.

CT findings in primary pulmonary lymphomas.

PURPOSE: To describe the CT findings of pathologically confirmed primary pulmonary lymphomas. MATERIALS AND METHODS: The CT examinations of 11 patients with pathologically proven primary pulmonary lymphoma (9 BALT lymphomas and 2 non-BALT lymphomas) were retrospectively reviewed by three radiologists. Evaluated findings included morphology (consolidation, mass, nodule), number and distribution of lesions. Other CT findings such as air bronchogram, lymphadenopathy, atelectasis and pleural effusion were also assessed. RESULTS: Pulmonary lesions were depicted as airspace consolidation (pneumonia-like) in 5 patients (45%), tumour-like rounded opacity in 4 (36%), and nodules in 4 (36%). Multiple and bilateral lung lesions were seen in 3 patients (27%). Air bronchogram was present in 7 patients (63%), lymphadenopathy in 3 (27%), atelectasis in 4 (36%) and pleural effusion in only 1 (9%). CONCLUSIONS: Our results agree with previous studies regarding lesion patterns and their relative frequency. A smaller number of nodules and multiple lesions were found compared with some previous studies. The most frequent pattern was airspace consolidation.

Low dose CT in early lung cancer diagnosis: Prevalence data.

PURPOSE: Lung cancer has a high mortality rate and its prognosis largely depends on early detection. We report the prevalence data of the study on early detection of lung cancer with low-dose spiral CT underway at our hospital. MATERIALS AND METHODS: Since the beginning of 2001, 519 asymptomatic volunteers have undergone annual blood tests, sputum tests, urinalyses and low-dose spiral CT. The inclusion criteria were age (=/> 55 years old), a history of cigarette smoking and a negative history for previous neoplastic disease. The diagnostic workup varied depending on the size and CT features of the nodules detected. RESULTS: At baseline, the CT scan detected nodules > 5 mm in 22% of subjects; the nodules were single in 42 and multiple in 71. In 53% of cases the findings were completely negative, while in 122 (23.4%) nodules with a diameter < 5 mm were detected. Six cases of lung cancer were identified, of which four were stage I, one stage was IIIB and one was stage IV with adrenal metastases. CONCLUSIONS: Our preliminary data on spiral CT as a potential new diagnostic tool for lung cancer screening, although less promising than the Japanese and ELCAP results, confirm the feasibility of the technique. Additional validation is, however, required.