Search results for " coral"
showing 9 items of 79 documents
The coralline red alga Lithophyllum kotschyanum f. affine as proxy of climate variability in the Yemen coast, Gulf of Aden (NW Indian Ocean)
2014
Abstract Recent investigations have shown the potential of red coralline algae as paleoclimatic archive. A previously unexplored subfamily of coralline algae, the Lithophylloideae, was investigated from the Gulf of Aden (Balhaf, Yemen). Seasonal changes in Mg/Ca, Li/Ca and Ba/Ca composition of Lithophyllum kotschyanum f. affine were investigated by Laser Ablation-Inductively Coupled Plasma Mass Spectrometry (LA-ICP-MS). For the first time in coralline algae, the Li/Ca composition was analyzed and showed a highly significant and positive correlation with Mg/Ca and SST. Monthly algal Mg/Ca and Li/Ca variations indicate a positive correlation with sea surface temperature (SST), and sea surface…
Coralli trapanesi nella collezione March
2016
Il volume tratta le opere trapanesi in corallo della collezione March, battute all''asta presso la sede londinese di Christie''s il 16 giugno 2015. Si tratta di esemplari di diversa tipologia, sia a carattere sacro che profano, che contribuiscono ad arricchire il catalogo della produzione trapanese in corallo tra XVI e XX secolo, attestandone ancora una volta l’eccezionalità nel contesto dell’area mediterranea e l’alto livello di esecuzione raggiunto da questi artisti. La preziosità di questi manufatti viene ulteriormente confermata dalla loro presenza in una prestigiosa collezione privata insieme ad esemplari di grande valore artistico come dipinti, sculture, arazzi, arredi ed opere d’arte…
230Th/U dating of Last Interglacial brain corals from Bonaire (southern Caribbean) using bulk and theca wall material
2016
Abstract We compared the suitability of two skeletal materials of the Atlantic brain coral Diploria strigosa for 230Th/U-dating: the commonly used bulk material comprising all skeletal elements and the denser theca wall material. Eight fossil corals of presumably Last Interglacial age from Bonaire, southern Caribbean Sea, were investigated, and several sub-samples were dated from each coral. For four corals, both the ages and the activity ratios of the bulk material and theca wall agree within uncertainty. Three corals show significantly older ages for their bulk material than for their theca wall material as well as substantially elevated 232Th content and (230Th/238U) ratios. The bulk mat…
One Rational Strategy for Restoration of Coral Reefs: Application of Molecular Biological Tools to Select Sites for Rehabilitation by Asexual Recruits
2000
Experiments for reef rehabilitation were performed at two selected sites near Hurghada (Red Sea, Egypt) the reef close to the Marine Biological Station (with a high sedimentation rate from landfilling) and El-Fanadir Reef (a clear water site). Since only little is known about the influence of the physical environmental conditions, novel molecular biological approaches have been introduced to assess the metabolic status of corals. In order to avoid possible interference with symbionts the molecular studies have been performed with the octocoral Dendronephthya klunzingeri; this species does not contain zooxanthellae. The metabolic enzymes fructose-1,6-bisphosphatase and the succinat-dehydroge…
Materiali tradizionali per una nuova arte orafa mediterranea
2010
Greater mitochondrial energy production provides resistance to ocean acidification in "winning" hermatypic corals
2021
Coral communities around the world are projected to be negatively affected by ocean acidification. Not all coral species will respond in the same manner to rising CO2 levels. Evidence from naturally acidified areas such as CO2 seeps have shown that although a few species are resistant to elevated CO2, most lack sufficient resistance resulting in their decline. This has led to the simple grouping of coral species into “winners” and “losers,” but the physiological traits supporting this ecological assessment are yet to be fully understood. Here using CO2 seeps, in two biogeographically distinct regions, we investigated whether physiological traits related to energy production [mitochondrial e…
El cant coral al País Valencià
2002
En este trabajo se presenta un análisis general de los principales coros y de la actividad coral en Valencia, Alicante y Castellón desde el final de la Guerra Civil hasta el año 2002. Se presenta una información general de las principales agrupaciones corales valencianas y se aportan datos sobre algunos coros de interés, pero que han permanecido en un injusto segundo plano. En definitiva, se trata de una aportación significativa a un campo de investigación que no cuenta con demasiada bibliografía.
Modeling red coral (Corallium rubrum) and African snail (Helixia aspersa) shell pigments: Raman spectroscopy versus DFT studies
2016
Pigments from red coral (Corallium rubrum) and African snail (Helixia aspersa) shell were studied non-invasively using Raman spectroscopy with 1064-nm laser beam. The two observed bands because of organic pigments confined in biomineralized CaCO3 matrix at about 1500 and 1100 cm−1 were assigned to ν(C[DOUBLE BOND]C) and ν(C―C), respectively. Both signals originate from polyene(s) of largely unknown structure, containing several conjugated C[DOUBLE BOND]C bonds. The small peak at 1016 cm−1 in the Raman spectrum of coral pigment was assigned to in-plane ―CH3 rocking or structural deformation of polyene chain because of spatial confinement in the mineral matrix. The organic pigments in red cor…
Gli esiti della ricerca di Gino Corallo in campo didattico
2022
La scelta del tema è motivata dal mio personale interesse per la pedagogia e la didattica di Gino Corallo (1910-2003), che è sorto verso la fine dei miei studi universitari e che mi ha portato a discutere la tesi di laurea su "La pedagogia di Gino Corallo", il 28 luglio 2003. Corallo ha fornito un contributo originale alla Pedagogia, che articolava in due scienze pedagogiche: la Pedagogia Generale e la Metodologia dell’educazione, inscindibilmente unite tra loro come due facce della stessa medaglia, mentre considerava la Didattica una scienza strettamente connessa con la Pedagogia. Gli esiti della ricerca di Gino Corallo in campo didattico non sarebbero comprensibili se fossero disgiunti da…