Search results for "CEO"
showing 10 items of 398 documents
Early Cretaceous termites in amber from northern Spain (Isoptera)
2020
Abstract Two virtually complete termites in Lower Cretaceous amber from the Penacerrada I outcrop, Spain, are described and figured, representing the most well-preserved Isoptera yet discovered from the Albian stage. The material is described as Ithytermes montoyai gen. et sp. nov., and is similar in many details to the slightly younger Krishnatermes yoddha Engel, Barden, and Grimaldi from northern Myanmar amber. Given the presence of distinct soldiers in this grade of Cretaceous termites, it is likely that I. montoyai also exhibited such a tripartite caste system. In addition to the type material of I. montoyai, two fragmentary termites are recorded for the first time in Albian amber from …
Timo
2009
Il genere Thymus appartiene alla famiglia delle Lamiacaee e comprende numerose specie distribuite nell’area mediterranea. Il nome deriva dal greco “δίμοσ” (profumo) per sottolineare l’intenso e gradevole aroma che la pianta produce. Secondo altri autori il nome trae origine dalla parola egiziana “tham”, che si riferisce ad una pianta profumata usata per le imbalsamazioni. In Italia il Pignatti descrive 17 specie di timo, delle quali quelle maggiormente interessanti da un punto di vista erboristico sono: T. vulgaris L. (timo comune), T. capitatus (L.) Hoffman et Link (timo capitato), T. serpyllum L. (timo serpillo) e T. zygis L. (timo rosso). Allo stato spontaneo sono presenti varie forme di…
Mirto
2009
Il genere Myrtus appartiene alla famiglia delle Mirtaceae e comprende numerose specie ornamentali sempreverdi e profumate, prevalentemente di origine tropicale, poco resistenti alle basse temperature. L’unica specie tipica dell’area mediterranea è Myrtus communis L., di cui si conoscono diverse sottospecie botaniche: leucocarpa (bacche bianche), tarentina (foglia piccola), microphylla (nana), ecc. La specie si estende in tutte le regioni calde dell’ Asia occidentale, dell’Africa settentrionale e dell’Europa meridionale. In Italia è presente allo stato spontaneo nel centro-sud, in particolar modo in Sardegna, vegeta preferibilmente nei suoli a reazione acida o neutra, in particolare quelli a…
Rosmarino
2009
Il genere Rosmarinus appartiene alla famiglia delle Lamiaceae. Diverse sono le interpretazioni sull’origine del nome del rosmarino. Per molto tempo si è pensato che il nome generico derivasse dal latino “ros” (rugiada) e “marinus” (marino), da cui “rugiada di mare”. Attualmente, gli etimologi sono concordi nel sostenere che la parola rosmarino provenga dal greco “rhos” (arbusto) e “myrinos” (aromatico), da cui “arbusto aromatico”. Questa seconda spiegazione sembra la più convincente in quanto rileva il carattere tipicamente aromatico della specie. Per l’Italia, il Pignatti riporta la specie Rosmarinus officinalis L., che si trova allo stato spontaneo nelle isole e lungo le coste della penis…
Sedimentary dynamics and extensional structuring related to early Cretaceous rifting of Neocomian and Barremian deposits of the interior basin of Gab…
2008
18 pages; International audience; Recent field and subsurface data about the early Neocomian N'dombo series and the Neocomian to mid-Barremian Schistes series of the interior basin of Gabon further our understanding of the initial stages of early Cretaceous N40–60E extensional rifting. The syn-rift series comprise fluvial–lacustrine claystones–sandstones, rare conglomerates, and carbonates. The syn-rift fill begins with braided-stream feldspathic sandstones. These are overlain first by fluvial–lacustrine deposits and then by predominantly lacustrine–palustrine claystones, which are potential petroleum source rocks. The claystones are eroded in part and are capped by the pre-Aptian angular u…
On the use of ionic liquids as mobile phase additives in high-performance liquid chromatography. A review.
2015
The popularity of ionic liquids (ILs) has grown during the last decades in several analytical separation techniques. Consequently, the number of reports devoted to the applications of ILs is still increasing. This review is focused on the use of ILs (mainly imidazolium-based associated to chloride and tetrafluoroborate) as mobile phase additives in high-performance liquid chromatography (HPLC). In this approach, ILs just function as salts, but keep several kinds of intermolecular interactions, which are useful for chromatographic separations. Both cation and anion can be adsorbed on the stationary phase, creating a bilayer. This gives rise to hydrophobic, electrostatic and other specific in…
A multi-analytical approach for the characterization of black crusts on the facade of an historical cathedral
2020
Abstract This study focuses on the characterization of black crusts collected from the Monza cathedral located in the homonymous city (N Italy), a hot spot from the point of view of the atmospheric pollution. Black crusts and substrate marble specimens were analyzed by a multi-analytical approach including X-ray Diffraction (XRD), Fourier Transform-Infrared spectroscopy (FT-IR), Stereomicroscopy (SM), Polarized Light Microscopy (PLM), High Resolution Scanning Electron Microscopy coupled with Energy Dispersive X-ray spectroscopy (HRSEM-EDX) and Laser Ablation Inductively Coupled Plasma Mass Spectrometry (LA-ICP/MS). The characterization of the carbon fraction (organic carbon, OC, and element…
Cenomanian–Turonian carbonate and organic-carbon isotope records, biostratigraphy and provenance of a key section in NE Sicily, Italy: Palaeoceanogra…
2008
In eastern Sicily, a series of highly organic-rich black shales occur as exotic blocks (~ 100 m across) floating in tectonized sediments (Argille Varicolori Unit containing olistoliths of Cretaceous-Palaeogene age). A 19-metre section, through one of these blocks near the town of Novara di Sicilia, includes cyclically bedded black shales, marlstones and claystones, which have been dated using planktonic foraminiferal and nannofossil biostratigraphy. On this basis, the section is assigned to the latest Cenomanian and clearly represents a manifestation of the Oceanic Anoxic Event characteristic of that interval. Total organic-carbon values range up to 23% and the relatively high hydrogen indi…
The Valanginian positive carbon isotope event in Arctic Russia: Evidence from terrestrial and marine isotope records and implications for global carb…
2010
The data presented here comprise Ryazanian–Valanginian carbon isotope ratios analyzed from fossil wood and belemnites from the shallow marine Boyarka River succession in Siberia. Additional belemnite carbon isotope ratios from the Izhma River succession (also Ryazanian–Valanginian) in Russia are also presented. The wood-derived and belemnite-derived isotope ratios are considered to primarily reflect changes in the terrestrial and marine carbon isotope reservoirs respectively. The δ13Ccarb and δ13Cwood records reveal a distinct mid-Valanginian positive carbon isotope excursion, with the initiation occurring near the Boreal Russian michalskii–polyptychus zone boundary, which is broadly time-e…
Lifestyle dependent occurrence of airborne fungi
2018
Abstract. Fungi play important roles in the environment, agriculture, and human health. Most fungal species spread by wind-driven dispersal of spores, determining their occurrence and distribution in different environments. The dynamics of airborne fungi and their dependence on lifestyle and environmental conditions, however, are not well characterized. Here, we categorize the fungi detected in coarse and fine aerosol samples from continental boundary layer air using a lifestyle classification scheme that differentiates whether the fungi are (A) primarily associated to herbaceous or woody plants and (B), whether they are saprophytic, plant pathogenic, or surface inhabitants. Herbaceous fung…