169,836 research outputs found
Middle Eocene to Early Miocene planktonic foraminiferal biostratigraphy in the Epiligurian Succession (Northern Apennines, Italy)
No full textPaleobathymetric reconstructions based on foraminifera the example of the Eocene to Miocene Epiligurian Seccession (Northern Apennines, Italy).
No full textI foraminiferi della successione paleogenica epiligure (Appennino Settentrionale, Italia): uno strumento per le ricostruzioni paleobatimetriche.
No full textPlanktonic Foraminifera Biostratigraphy of the Middle Eocene - Lower Miocene Epiligurian Siccession (Northern Apennines, Italy).
No full textPartecipazione sociale, senso di comunità e benessere: una ricerca con studenti universitari
No full textBenthic and planktonic foraminifera of the Paleogene Epiligurian Succession (Northern Apennines, Italy): a tool for paleobathymetric reconstruction
No full textA paleobathymetric reconstruction, based on benthic and planktonic foraminiferal assemblages, has been carried out for the Epiligurian Succession of the Northern Apennines chain (Middle Eocene-Early Miocene). The paleobathymetric interpretation has been obtained from the integration and comparison of four parameters used separately by previous authors: i) Plankton/Plankton+Benthos ratio; ii) benthic morphogroups, both infaunal and epifaunal, iii) planktonic "paleobathymetric indexes"; iv) relative abundance of benthic index species belonging to depth-dependent habitats. The applied method has been carefully discussed with respect to the studied geological setting. Moreover, the possible impact of taphonomic processes, such as selective preservation, transport and redeposition, has been evaluated. It resulted absent or limited and than, no influential on the reliability of the obtained data. The main results can be summarized as follows: an overall shallowing upwards trend is observed; in particular, a lower bathyal depth (over 2000 m to about 1000 m) has been determined for the "varicoloured facies" of the Monte Piano Marls. Lower to middle bathyal depth (about 1000 m to 600 m) have been obtained for the "grey facies" of the same formation and for the sandstones of the Ranzano Fm. Finally, the Antognola Marl Fm. (and its lateral equivalent units) contains foraminiferal assemblages indicating an upper bathyal paleodepth (about 600 m to 200 m). This shallowing up trend is tentatively related to the history of vertical motion ("geohistory") of the underlying Ligurian orogenic wedge from the Middle-Late Eocene to the Early Miocene, in response to tectonics and sedimentary load
Distribuzione di acidi grassi polienoici nei fosfolipidi delle membrane di molluschi bivalvi
No full textAllo scopo di contribuire alla definizione del ruolo degli acidi grassi NMID (Non Methylene Interrupted Dienoic fatty acids) nell' economia generale delle cellule dei Molluschi bivalvi, si intende intraprendere uno studio sistematico che consenta di individuare un rapporto tra la loro distribuzione e potenziale funzione del distretto che li ospita.
Tale obiettivo è perseguito attraverso i seguenti stadi successivi: a) accertare se le differenze fra le specie siano geneticamente predeterminate o correlate semplicemente ai diversi habitat naturali di origine; b) definire la distribuzione degli NMID nelle diverse membrane cellulari per eventualmente poi individuarne una possibile relazione con funzioni e aspetti specifici dei diversi distretti cellulari; c) definire, sempre nell'ambito delle diverse membrane cellulari, la distribuzione degli NMID nelle diverse classi fosfolipidiche per valutare se il loro modello di distribuzione subisca variazioni correlabili alle diverse funzioni di distretti cellulari differenti; d) valutare se le membrane più ricche di NMID risultino effettivamente più resistenti allo stress ossidativo
Middle Eocene to middle Miocene planktonic foraminiferal biostratigraphy for internal basins (Monferrato and Northern Apennines, Italy)
No full textMulti-proxy analysis on Neogene specimens of Colominella Popescu, 1998 (Agglutinated Foraminifera): shell architecture, wall microstructure and test chemical-mineralogical characterization
No full textNew species of Pararotalia le Calvez, in Pliocene sediments of the Lower Valsesia and Western Liguria.
No full textThe aim of this note is to describe Pararotalia padana n. sp., found in Pliocene outcrops of the Lower Valsesia and Western Liguria. The new species differs from the previously known Pararotalia species, such as P. armata (d'Orbigny, 1826) by possessing different size, number and shape of chambers and ornamentation
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