0000000000007298
AUTHOR
V Randazzo
Two end-members of carbonate slope evolution during the Late Cretaceous in the peri-Tethyan domain (Western Sicily and Southern Albania)
Climatic and tectonic processes are major mechanisms influencing tropical carbonate platform development, sediment production and sediment export. Mass transport deposits (including slides, slumps and debrites) and calciturbidites are some of the sediment export products resulting from the interplay of aforementioned redeposition mechanisms. They reflect distinct variations in both production and export of sediments from the carbonate factories. The gravitary export deposits provide information on their sediment source and result in sedimentary sequences with specific porosity / permeability properties prone to host hydrocarbon resources. Climate-controlled sea-level variations are well-con…
Polimorfismo del gene ACE:gene della longevità o fattore di rischio nella patologia ipertensiva
Negli ultimi decenni l’allungamento della vita media ha stimolato un particolare interesse nello studio dei processi dell’invecchiamento e nella ricerca di possibili geni coinvolti nella longevità. In particolare i centenari dimostrano di avere una prevalenza minore di malattie cardiovascolari e dei fattori di rischio ad essa correlati. L’enzima di conversione dell’angiotensina (ACE), presente in tutte le cellule endoteliali, gioca un ruolo essenziale nel mantenimento dell’omeostasi del flusso vascolare, regolando sia la produzione del vasocostrittore angiotensina II sia inattivando la bradichinina. In particolare alcuni studi hanno riportato una possibile correlazione tra il polimorfismo I…
Shallow ocean oxygen decline during the end-Triassic mass extinction
The end-Triassic mass extinction (ETME) was associated with intensified deep-water anoxia in epicontinental seas and mid-depth waters, yet the absolute oxygenation state in the shallow ocean is uncharacterized. Here we report carbonate-associated iodine data from the peritidal Mount Sparagio section (Southern Italy) that documents the ETME (~ 200 Ma) in the western Tethys. We find a sharp drop in carbonate I/(Ca + Mg) ratios across the extinction horizon and persisting into the Early Jurassic. This records local dissolved oxygen and iodate decline in the near-surface ocean of low-latitude Tethys due to the development of depleted oxygen concentrations. Consequently, during the ETME even sha…