Daily monitoring of an Adriatic coastal stretch Volterra, L. (Istituto Superiore di Sanita, Rome (Italy)); Aulicino, F.A; Bonadonna, L ...
The Science of the total environment,
(1992), Letnik:
126
Journal Article
Goal and Scope. At the present time, wastewater disinfection is mainly carried out by adding chlorinated oxidants as chlorine, hypochlorite or chlorine dioxide. However, this common practice has ...determined the introduction of new toxic and persistent by-products in the environment. The risks associated with the pollutants generated by traditional disinfection treatments have made the study of alternative technologies necessary. Peracetic acid (PAA) has recently been used to disinfect sewage effluents, but very little is known about its performance in microbiological removal and about the nature of its potential by-products. The present study was carried out to assess the actual effectiveness of PAA against several bacteria and bacteriophages, as well as the presence of disinfectant residues and by-products in the effluent.
In Italy controls on the hygienic quality of swimming pools are fixed by the Accordo tra il Ministero della Salute, le regioni e le province autonome di Trento e di Bolzano, come into force in 2003. ...In the present study swimming pools were investigated from the microbiological point of view on the basis of the new legislation. Contemporaneously, for the first time in Italy, analytical controls on the occurrence of the protozoa Cryptosporidium and Giardia were performed with both techniques of immunofluorescence and polymerase chain reaction. Results evidenced a good water quality when the bacterial parameters stated by law were considered. However in some swimming pools, the protozoa were also recovered. Factors affecting the use of molecular techniques on the analysis of environmental samples are also put into evidence.
An investigation on the hygienic quality of the Tiber river was conducted with the aim both to enumerate Giardia cysts and Cryptosporidium oocysts in the water and to determine possible correlations ...between them and bacterial indicators, pathogens and physico-chemical parameters. A low hygienic water quality was evidenced, with high counts of microorganisms. Furthermore, variable concentrations of Giardia and Cryptosporidium were observed. No correlation was found between the protozoa concentrations and that of the other microorganisms, whilst a significant correlation with redox potential and Giardia cysts was calculated.
The heterotrophic plate count (HPC), at different temperatures, allows to recover mesophilic and psychrophilic bacteria, including some pigmented forms. Their densities were verified in well water ...used as a drinking water source and quali-quantitative differences of the colonies grown on different plate count media were evaluated. Most of the samples analysed had a good hygienic quality if the common indicators of faecal pollution were considered. Nevertheless high counts for the HPC bacteria and pigmented flora were recovered and among them some potential pathogens were identified. Therefore, even for the potential role of human pathogens posed by HPC bacteria naturally occurring in potable water, the European Member States should evaluate with particular attention the possibility of maintaining the HPC parameter when the new Directive on drinking water quality would have to be adopted.
A cDNA clone encoding the mouse Ly-17+ Fc receptor for IgG, isolated from a myelomonocytic cell line, was sequenced and expression of mRNA and the functional Fc gamma R investigated. The receptor is ...a 301 amino acid transmembrane glycoprotein with two homologous extracellular domains that are also homologous to members of the Ig superfamily. The receptor has four sites of N-linked glycosylation and a long 94 amino acid cytoplasmic tail. Northern analysis, immune complex binding, and serological studies demonstrate that the receptor encoded by the cDNA clone binds mouse IgG gamma 1/2b and rabbit IgG complexes.
The paper describes an infestation by nematodes in a municipal drinking water plant in Eastern Italy. The procedures for detecting the public health significance of these presences and the measures ...for avoiding risks for population are reported. Furthermore the preliminary results of the analyses of water from a pilot plant carrying a Diatomeaceus Hearth Filtration are reported.
