Search results for " SEA"

Submarine canyon of the north-western Sicilian offshore (Southern Tyrrhenian Sea): variability in morphologies, sedimentary processes and tectonic se…

2013

Retention of three fissure sealants and a dentin bonding system used as fissure sealant in caries prevention: 12-month follow-up results

2007

Background. Bonding agents could be used as fissure sealants. This study compares the retention three fissure sealants (Delton®, Delton Plus® and Concise®) and a filled dentin bonding system (Optibond Solo®). Methods. Fifty-six children aged 7-8 years received fissure sealants either in the four permanent first molars, in the four deciduous second molars, or in all eight of these teeth. Every child received a different sealing material in each quadrant on a random basis. Clinical evaluation at 12 months was performed by a single blind examiner, and the retention was classified as either a success (total retention) or a failure (partial retention or not present). Results: There were no stati…

Marine Invertebrates as Bioindicators of Heavy Metal Pollution

2015

The marine environment presents a range of anthropogenic contaminants. According to the World Health Organization, more than 100,000 chemicals are released into the global environment every year as a consequence of their production, use and disposal. The fate of a chemical substance depends on physical-chemical properties, in combination with the characteristics of the environment where it is released. Among the substances that accumulate in the sea, for anthropogenic activities, metals/metalloids have a leading position. Some of these have a biological role but their bioaccumulation is injurious. Chemical pollutants can cause effects on organisms, biodiversity and human health. Various eff…

Stranding patterns of the striped dolphin (Stenella coeruleoalba, Meyen 1833, Delphinidae) along the Sicilian coast (Mediterranean Sea)

2019

Along the coasts of Sicily, 73 striped dolphins strandings were recorded from 2013 to 2016. The specimens were collected at the Centro di Monitoraggio e Controllo per Tartarughe marine e Cetacei [Monitoring and Control Centre for Marine Turtles and Cetaceans] at the Istituto Zooprofilattico Sperimentale della Sicilia. Subsequent necropsies were performed to determine the cause of death. The date and stranding location were recorded for each specimen. Total body length, weight, sex, and other key biometric measurements were also recorded for fresh and moderately decomposed specimens. The individuals were divided into three life stage categories on the basis of total body length: (1) newborns…

Distinct microbial populations are tightly linked to the profile of dissolved iron in the methanic sediments of the Helgoland mud area, North Sea

2015

Iron reduction in subseafloor sulfate-depleted and methane-rich marine sediments is currently a subject of interest in subsurface geomicrobiology. While iron reduction and microorganisms involved have been well studied in marine surface sediments, little is known about microorganisms responsible for iron reduction in deep methanic sediments. Here, we used quantitative PCR-based 16S rRNA gene copy numbers and pyrosequencing-based relative abundances of bacteria and archaea to investigate covariance between distinct microbial populations and specific geochemical profiles in the top 5 m of sediment cores from the Helgoland mud area, North Sea. We found that gene copy numbers of bacteria and ar…

Holocene Spatiotemporal Redox Variations in the Southern Baltic Sea

2021

Low oxygen conditions in the modern Baltic Sea are exacerbated by human activities; however, anoxic conditions also prevailed naturally over the Holocene. Few studies have characterized the specific paleoredox conditions (manganous, ferruginous, euxinic) and their frequency in southern Baltic sub-basins during these ancient events. Here, we apply a suite of isotope systems (Fe, Mo, S) and associated elemental proxies (e.g., Fe speciation, Mn) to specifically define water column redox regimes through the Baltic Holocene in a sill-proximal to sill-distal transect (Lille Belt, Bornholm Basin, Landsort Deep) using samples collected during the Integrated Ocean Drilling Program Expedition 347. At…

Living Coccolithophores from the Gulf of Sirte (Southern Mediterranean Sea) during the summer of 2008

2012

The Gulf of Sirte is a largely unexplored area in the southernmost Mediterranean Sea.We are presenting here 2008 summer data on the distribution pattern of living coccolithophores, a main phytoplankton calcifying group, in 105 samples from 20 stations. The survey includes coastal and offshore stations, enabling us to provide indications on the dynamics of phytoplankton productivity in relation to oceanographic processes. The total coccosphere concentrations show higher values in the offshore stations and lower ones for coastal sites. Umbellosphaera tenuis, Emiliania huxleyi, Florisphaera profunda, Syracosphaera pulchra HOL (Calyptrosphaera oblonga) and Rhabdosphaera spp. dominate the assemb…

’Green’ strategies and approaches. A contribution from the off-site and upcycling of discarded shipping containers

2021

La Terra versa oggi in una condizione di vulnerabilità che gran parte degli studiosi attribuisce a un modello di crescita infinita inseguita su un pianeta con risorse limitate. In relazione a questo contesto ambientale critico il contributo si propone di stimolare nuove prassi per il settore delle costruzioni suggerendo una visione sistemica che faccia ricorso contemporaneamente a più approcci sostenibili e circolari e che, combinando tecniche e tecnologie tradizionali e innovative, consenta l’eliminazione di scarti e rifiuti. In particolare, l’articolo illustra le potenzialità della prefabbricazione nel contenimento degli impatti ambientali diretti e indiretti rispetto a un’equivalente cos…

Systematic conformational search analysis of the SRR and RRR epimers of 7-hydroxymatairesinol

2010

An extensive and systematic conformational search was performed on the two epimers of the natural lignan 7-hydroxymatairesinol (HMR), by means of a home-made Systematic Conformational Search Analysis (SCSA) code, designed to select more and more stable conformers through sequential geometry optimization of trial structures at increasing levels of calculation theory. In the present case, the starting molecular structures were selected by the semi-empirical AM1 method and filtered – i.e. decreased in number by choosing the more stable species – on the basis of their energy calculated by the HF method and the 6-31G(d) basis set. The geometries obtained were further refined by performing densit…

SearchBot: Supporting voice conversations with proactive search

2018

Searching during conversations and social interactions is becoming increasingly common. Although searching could be helpful for solving arguments, building common ground, and reinforcing mutual assumptions, it can also cause inter-actional problems. Proactive search approaches can enrich conversations with additional information without neglecting the shared and established social norms of being attentive to ongoing interaction. This demo showcases SearchBot, a tool that minimizes the issues associated with the practice of searching during conversations. It accomplishes this by tracking conversational background speech and then providing continuous recommendations of related documents and e…