Search results for "Protective system"
showing 3 items of 3 documents
Design of a new high energy rear underrun protective device
2008
In recent years the vehicle design field has followed a progressive evolution by focusing its main interest on passive and active safety levels. One of the most injurious cases for the safety of passengers is the crash between a car and a heavy vehicle (truck). Generally, in fact, when such an occurrence happens, the greatest damage is suffered by the passengers of the car. This is because of the considerable structural difference between the two vehicles and the lack of devices to reduce the injuries of the car passengers. In this work, as a consequence of the previous considerations, we deal with the design of a new protective system for heavy vehicles over 3.5 tons. The new rear underrun…
Proteggere e Valorizzare: una buona pratica per i siti archeologici
2014
Tra i beni culturali quelli archeologici hanno più animato il dibattito culturale sul rapporto tra conservazione e loro messa in valore. La fragilità con cui la materia ci viene consegnata dalla storia, la frammentarietà del reperto, la scarsa disponibilità di risorse finanziarie, anche in relazione alla vastità del patrimonio a noi pervenuto, impongono interventi mirati e talvolta urgenti per la salvaguardia e la conservazione dei beni archeologici. Ma la sola conservazione non può però costituire l’obiettivo ultimo dell’intervento: poiché i beni archeologici rappresentano il nostro lontano passato è anche necessario recuperarne il valore e comunicarne l’identità. La conoscenza storica, st…
Dihydrodiol Dehydrogenase: An Important Enzyme in Dihydrodiol-Epoxide Pathway — Mediated Benzo(A)Pyrene Mutagenicity
1978
Benzo(a)pyrene is metabolized to two major groups of mutagenically reactive metabolites: Monofunctional epoxides and dihydrodiol-epoxides. Various monooxygenase forms catalyze the various pathways at very different rates. In metabolic situations where the contribution by dihydrodiol-epoxides is small, epoxide hydratase represents a very efficient protective system. However, in situations where the mutagenic effect is predominately due to dihydrodiol-epoxide, the effect of epoxide hydratase is complicated and weak. We have now obtained evidence that a dihydrodiol dehydrogenase represents an efficient protective system in the latter situation. The enyzme was purified to homogeneity and the pu…