1,721,038 research outputs found
Ulvaceae e rhodophyceae: crescita, composizione, polisaccaridi solforati e fitopigmenti per applicazioni biotecnologiche
No full textQuesto studio approfondisce le dinamiche di crescita e la produzione in campo di quattro specie algali a rapido accrescimento Ulva rigida, Gracilaria gracilis, Gracilaria vermiculophylla e Gracilariopsis longissima e indaga quelle che sono le principali frazioni biochimiche nelle alghe quanto a contenuto di: proteine, carboidrati totali, polisaccaridi solforati solubili e ceneri durante l’arco di un anno. L’uso congiunto di queste informazioni svela i periodi e le condizioni più idonee per la coltivazione e la produzione di diversi composti. La valorizzazione delle biomasse algali è stata quindi ulteriormente qualificata dallo studio e messa a punto di metodiche innovative per l’estrazione e la quantificazione delle ficobiliproteine e per la purificazione della ficoeritrina
Carbohydrate and agar yield: preliminary insights on seasonal variations in Ulva and three Gracilariaceae
No full textFour seaweeds (Ulva rigida, Gracilaria gracilis, Gracilariopsis longissima and
Gracilaria vermiculophylla) were monitored monthly from January to December 2014 in two eutrophic
areas of the Venice Lagoon. The biochemical variations of total carbohydrates and native agar were
measured. The agar yield of G. longissima was the highest, reaching 13.2 tonnes per hectare dwt with
the highest agar percentages exceeding 70% in January
SEAWEED PROTEIN PRODUCTION IN THE VENICE LAGOON: SEASONAL VARIATIONS IN ULVA RIGIDA AND THREE GRACILARIACEAE
No full textFour seaweeds (Ulva rigida, Gracilaria gracilis, Gracilariopsis longissima and
Gracilaria vermiculophylla) were monitored monthly from January to December in the Venice Lagoon. The protein percentages and areal production were measured. The protein content reached 25% in the red seaweeds in winter with averagely low summer values. Protein production peaked in Spring in G. longissima and G. vermiculophylla
Effects of Clam seed harvesting on Ruditapes philippinarum (Adams and Reeve, 1850) populations in the lagoon of Venice. Effetti della raccolta del seme sulle popolazioni di Ruditapes philippinarum nella laguna di Venezia.
No full textEffects of Clam seed harvesting on Ruditapes philippinarum (Adams and Reeve, 1850) populations in the lagoon of Venice.
No full textThe decline of Ruditapes philippinarum populations in the Venice Lagoon encourages the exploitation of the last seed stocks of polluted areas, for clam-farming in the licensed areas of the Lagoon. These polluted zones became nursery habitats for clams from where juveniles could naturally spread. This study evaluates the impact of catching activities and seed harvesting on the Manila clam
In situ biomass production of Gracilariaceae and Ulva rigida: The Venice Lagoon as study case.
No full textThe growth and biomass production of the\ud
most abundant Gracilariaceae: Gracilariopsis longissima\ud
(S.G. Gmelin) M. Steentoft, L.M. Irvine et W.F. Farnham,\ud
Gracilaria gracilis (Stackhouse) M. Steentoft, L.M. Irvine et\ud
W.F.Farnham and Gracilaria vermiculophylla (Ohmi) Papenfuss,\ud
and of Ulva rigida C. Agardh were studied during\ud
1 year in two areas of the Venice Lagoon, namely Tresse and\ud
San Giuliano, that were characterized by different trophic\ud
levels and water turbidity. Both growth and macroalgal\ud
production were monitored every 7–11 days in cubical\ud
cages placed on the bottom within the natural biomass.\ud
Environmental parameters, nutrient concentrations in the\ud
water column and surface sediments, and sedimentation\ud
rates were also determined. The biomass production of the\ud
two stations was very different and strongly influenced by\ud
the water turbidity and sedimentation rates. In both areas\ud
the availability of nutrients were high, but Tresse, where\ud
waters were more transparent, was more productive. In\ud
that area, the annual production of Gracilariaceae ranged\ud
between 21.9 and 28.2 kg fresh weight (fw) m−2 and G. longissima\ud
was the most productive species. Ulva production\ud
was within the same range (25.8 kg fw m−2). The mean\ud
relative growth rates on an annual basis were between\ud
1.87 and 2.41% day−1. In contrast, in the turbid area (San\ud
Giuliano), the annual production of Gracilariaceae was\ud
much lower, ranging from 9.0 to 12.8 kg fw m−2 and that of\ud
Ulva was 15.2 kg fw m−2
Macrofite e stato ecologico dell'area individuata per il passaggio delle grandi navi nella laguna di Venezia
No full textMacrophyte distribution and the main ecological parameters of the area between the historical centre of Venice and the industrial area of Porto Marghera were investigated. A map of macrophytes was carried out by sampling 150 sites in July 2015. Four sites were monitored from July to October 2015 by sampling both macrophytes and nutrient concentrations in the water column and surface sediments. The aim was to determine the trophic conditions and the ecological status of that area before the digging of a new canal to create a new access to the large ships that arrive in Venice
Biochemical characterization of some cyanobacterial strains from salt marshes of the Venice Lagoon.
Full text linkAbstract Three different strains of filamentous cyanobacteria,
Tychonema, Limnothrix, and Pseudoanabaena, were selected
among the fastest growing taxa collected in the salt marshes of
Venice Lagoon and were grown in laboratory for growth rate
determination and biochemical characterization of chlorophylla,total proteins, total carbohydrates, and exopolysaccharides.Experiments were carried out both in liquid medium and two different substrates: artificial plant protection fabric and ground indigenous shells. Cyanobacterial behavior was recorded to better understand colonization of natural and new artificial marshes
Macrofite e stato ecologico dell'area individuata per il passaggio delle grandi navi nella laguna di Venezia
No full textMacrophyte distribution and the main ecological parameters of the area between the historical centre of Venice and the industrial area of Porto Marghera were investigated. A map of macrophytes was carried out by sampling 150 sites in July 2015. Four sites were monitored from July to October 2015 by sampling both macrophytes and nutrient concentrations in the water column and surface sediments. The aim was to determine the trophic conditions and the ecological status of that area before the digging of a new canal to create a new access to the large ships that arrive in Venice
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