Search results for "ZOOLOGIA"

Phenoloxidase-dependent cytotoxic mechanism in ascidian (Styela plicata) hemocytes active against erythrocytes and K562 tumor cells.

1997

The cytotoxic activity against rabbit erythrocytes (RE) and human K562 tumor cells by Styela plicata hemocytes was significantly related to the phenoloxidase (PO) which converts phenols to quinone and initiates the melanogenic pathway. The effector hemocyte population, separated in a Percoll density gradient band, enriched in a granulocyte type named "morula cells", was examined with RE in a hemocyte cytotoxic assay and plaque forming cell assay. Inhibition experiments with the copper chelating agents 1-phenyl-2-thiourea and tropolone, the substrate analogue sodium benzoate and sodium ascorbate support the notion that hemocyte cytotoxic activity is a PO-dependent mechanism. Treatments of he…

Inhibitory activity of sphingomyelin on hemolytic activity of coelomic fluid of Holothuria polii (echinodermata)

1987

Abstract The hemolytic activity of coelomic fluid from Holothuria polii is specifically inhibited by sphingomyelin. This phospholipid is the constituent of the membrane which probably interacts with the hemolysin thereby leading to the lysis.

3. Eurasian Thick-knee Burhinus oedicnemus

2021

Eurasian Thick-knee Burhinus oedicnemus

Evidence of a complex phylogeographic structure in the common dormouse, Muscardinus avellanarius (Rodentia: Gliridae)

2012

Contact: amouton@ulg.ac.be; International audience; This is the first mitochondrial phylogeography of the common dormouse, Muscardinus avellanarius (Linnaeus, 1758), a hibernating rodent strictly protected in Europe (Habitat Directive, annex IV; Bern Convention, annex III). The 84 individuals of M. avellanarius, sampled throughout the distributional range of the species, have been sequenced at the mitochondrial DNA gene (cytochrome b, 704 base pairs). The results revealed two highly divergent lineages, with an ancient separation around 7.7 Mya and a genetic divergence of 7.7%. Lineage 1 occurs in Western Europe (France, Belgium, and Switzerland) and Italy, and lineage 2 occurs in CentralNor…

LXXI Congresso Nazionale dell'Unione Zoologica Italiana

2010

Effects of Nest and Colony Features on Lesser Kestrel (Falco naumanni) Reproductive Success

2012

The Lesser Kestrel is a facultative colonial raptor mostly breeding in man-made structures. During 2009-2011 we checked the fate of 545 nests found in 18 colonies located in south-eastern Sicily. We determined the reproductive success of breeding pairs by analysing the survival time of each egg to hatching ( n = 2,495) and each nestling to fledging ( n = 1,849) with the linear hazard model of survival times. We determined whether egg and nestling survival differed between years with a Gehan–Wilcoxon test. By Cox regressions, we related the survival times with nest and colony features. Egg and nestling survival times showed a strong annual effect. The two reproductive stages of the Lesser K…

Environmental suitability model for the lanner falcon Falco biarmicus feldeggii: planning, study and monitoring the Sicilian population

2017

The identification of suitable areas, by spatially explicit distribution models, is crucial for conservation of threatened species as the lanner falcon Falco biarmicus feldeggii. Monitoring and collecting data on lanner falcon during years has proven to be essential for better defining the areas of species environmental suitability. Recent research shows that breeding performances of this species are strongly influenced by bioclimatic factors, especially monthly temperature and rainfall, or linked to landscape morphology, such as the slope of territories. These environmental parameters combined with species productivity (number of fledged juveniles per checked pair) of geo-referenced breedi…

Sistematica del Falco pellegrino (Falco peregrinus) in Italia

2021

Validated data and published studies indicate that four subspecies are present in continental Italy and its surrounding islands. Two of these subspecies (F. p. peregrinus and F. p. brookei) represent breeding populations, while the other two (F. p. calidus and F. p. pelegrinoides) winter and migrate in the country. Indeed, the European subspecies (F. p. peregrinus) has the most intriguing status, as it can both breed and winter. The exact range of the breeding population is not well-defined - it probably occurs in alpine and pre-alpine areas, perhaps reaching the Apennines of central Italy. Individuals originating from northern European countries in autumn and winter certainly implement thi…

IL FALCO PELLEGRINO (Falco peregrinus) IN SICILIA

2021

having doubled in number during the period 1978-2006, the population of the Peregrine Falcon Falco peregrinus living in Sicily currently seems to be stable, and has very probably reached the carrying capacity at the current ecological conditions of the insular ecosystems. A continuous standardized census (2010-2019) estimated at least 257 pairs scattered across the main island, plus some 13-15 pairs living on the small islands around Sicily. The population is not randomly distributed, but rather it is concentrated in all the suitable habitats of the island, nesting in either small crags or large cliffs from sea level to 1,424 m asl; it is rarer in the north-eastern corner (Peloritani, Nebro…

Falcon Conservation: azioni pratiche per la tutela del lanario Falco biarmicus feldeggii

2017

Il progetto Falcon Conservation nasce nel 2014 e dal 2016 è supportato dalla fondazione Nando ed Elsa Peretti, con lo scopo di acquisire nuovi dati sulla biologia e la conservazione dei Rapaci ed in particolar modo del lanario Falco biarmicus feldeggii e del pellegrino Falco peregrinus brookei. Falcon Conservation si basa sulla ricerca scientifica e sulla Citizen Science ed ha tra gli obiettivi la divulgazione e il coinvolgimento degli studenti universitari e dell’opinione pubblica in genere. Le azioni pratiche del progetto si sono concentrate sul monitoraggio di popolazione in tre aree-campione che corrispondono alla Sicilia occidentale, centrale ed orientale. I censimenti sul campo sono s…