1,720,990 research outputs found
Fitting of nickel(II) ion into two 14-membered tetraaza macrocycles. Blue-to-yellow conversion and the oxidation and reduction behavior
No full textThe novel satd. tetraaza macrocycle isocyclam (I) was prepd. and the behavior of its Ni(II) complexes, which contain a 5,5,6,6 sequence of chelate rings, was compared with that of corresponding complexes of cyclam (II) (sequence: 5,6,5,6). These complexes exist in soln. as a mixt. of blue, octahedral, high-spin and yellow, planar, low-spin species; the thermodn. parameters for the blue-to-yellow conversion depend upon the cyclic nature of the ligand. In analogy with Ni(cyclam)2+, Ni(isocyclam)2+ undergoes 1-electron oxidn. and redn. processes at a Pt electrode in MeCN. The easier redn. and more difficult oxidn. of both blue and yellow 5,5,6,6 complexes with respect to the 5,6,5,6 analogs are related to the differences in the in-plane Ni-N interaction parameters, as inferred from electronic spectra. General redox behavior of Ni(II) complexes with tetraaza macrocycles was reconsidered and a linear correlation between oxidn. and redn. potentials is presented
Microbial characteristics of marine sediments in bathing area along Pesaro-Gabicce coast (Italy)
No full textAims:The aim of the present work was to study the presence of human pathogen microorganisms in marine sediments at two bathing beaches and to compare the data obtained to grain size analyses of the sediments in order to observe any existing relationships between grain size and microbial charge
Methods: The sediment samples were collected in two small bays along the central Adriatic coast, wherebreakwaters had been built for the purpose of halting marine erosion. Faecal contamination indicators, Salmonella
and Vibrio species, enteric viruses were investigated using standard techniques for isolation and identification. The grain size was determined using calibrated sieves and _Sedigraph_ device.
Results: The values of faecal contamination indices varied depending on the area and in some samples overstepped legislative limits. Salmonella was never found. Vibrio was found in several samples and a considerable presence of enteric viruses was registered. The micro-organisms were preferentially abundant in fine sediments.
Conclusions: Marine sediments can represent an important reservoir of allochthonous and marine microorganisms and the microbial charge correlates with the characteristics of the sediments. There was not a correlation between allochthonous microorganisms such as Enterobacteriaceae and indigenous microorganisms such as Vibrio.
Significance and Impact of the Study: This study indicates that in addition to the faecal contamination indicators and the specific pathogens provided for by the present Italian legislation, other biological indicators should be investigated.
In addition, being marine sediments an important microbial reservoir, it is important to analyse them before defining the quality of coastal areas
Faecal contamination indicators, salmonella, vibrio and aeromonas in water used for the irrigation of agricultural products.
No full textFaecal contamination indicators in irrigation waters: evaluation of standard method and comparison with an alternative system.
No full textMicrobiology of surface water used for crop irrigation: faecal contamination indicators, Salmonella, Vibrio and Aeromonas
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Evaluation of fungal community involved in the bioderioration process of wooden artworks and canvases in Montefeltro area (Marche, Italy)
Full text linkEvaluation of ultraviolet irradiation efficacy in an automated system for the aseptic compounding using challenge test
No full textObjective: Ultraviolet (UV) irradiation efficacy in the intravenous compounding robot APOTECAchemowas evaluated to define the best operative conditions in terms of sterility and time optimization. Design: The challenge test was used against Pseudomonas aeruginosa, Escherichia coli, Staphylococcus aureus, Bacillus subtilis spores and Candida albicans. Inoculated plates were placed inside the robot and irradiated for different times. Microbial air and surface quality inside the equipment were monitored utilizing settle and contact plates, swabs. Results: After 4 h, no microorganisms were viable with killing rates ranging from 5-to 7-log for different microorganisms after 1 h of exposition. In confirmation of the efficacy of the UV irradiation program adopted, the microbial monitoring inside the equipment always gave negative results. Conclusions: This is the first exhaustive investigation of UV irradiation efficacy in the aseptic pharmaceutical production. We demonstrated that UV irradiation plays an essential role in maintaining the sterility condition of the workplace inside the APOTECAchemo and assuring the standards for aseptic manufacturing of medicinal drugs, as required for Class A clean areas. A 4-h UV irradiation also ensures sterility in the case of very resistant microorganisms and in the presence of high microbial charge (108 CFU/ml), but a killing rate of 5 or more is already recorded after the first hour of exposition. The results provide useful information for the best operative conditions in terms of both sterility and time optimization, not only for the automated compounding, but also for the traditional aseptic manufacturing processes. © The Author 2015. Published by Oxford University Press in association with the International Society for Quality in Health Care; all rights reserved
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