Search results for "Pere"

Mononuclear Mn(III) and dinuclear Mn(III,III) Schiff base complexes: Influence of π–π stacking on magnetic properties

2012

Abstract Synthesis of a mononuclear Mn(III) (1) and a dinuclear Mn(III, III) (2) complex of a tetradentate N2O2 donor Schiff base ligand with ancillary carboxylate ligands are reported. Complex 1 crystallizes in the monoclinic space group C2/c, complex 2 in the triclinic space group P-1. In both complexes the central Mn(III) ions are hexacoordinated having a distorted octahedral MnN2O4 coordination environment. Intermolecular hydrogen bonding and strong π–π stacking in both 1 and 2 leads to dimerization of 1 and formation of a syn–anti one-dimensional chain for 2. Magnetic properties of 1 and 2 are reported. Both complexes show very weak intermolecular antiferromagnetic interaction. Most in…

Carbon dynamics of soil organic matter in bulk soil and aggregate fraction during secondary succession in a Mediterranean environment.

2013

Clarifying which factors cause an increase or decrease in soil organic carbon (SOC) after agricultural abandonment requires integration of data on the temporal dynamics of the plant community and SOC. A chronosequence of abandoned vineyards was studied on a volcanic island (Pantelleria, Italy). Vegetation in the abandoned fields was initially dominated by annual and perennial herbs, then by Hyparrhenia hirta (L.) Stapf, and finally by woody communities. As a consequence, the dominant photosynthetic pathway changed from C3 to C4 and then back to C3. Conversion of a plant community dominated by one photosynthetic pathway to another changes the 13C/12C ratio of inputs to SOC. Using the time si…

Oracion panegyrica, declamacion oratoria a los inclytos martyres San Juan de Perusia, y San Pedro de Saxoferrato, Patronos de la leal ciudad de Teruel

Data de la aprobació en p. [6], 175 Sign.: A20 Text amb postil·les marginals i reclams Caplletres grav., bandes

Tapered drip laterals and manifolds in flat and rectangular irrigation units

2023

Multiple-diameter laterals and manifolds reduce the total cost in microirrigation systems, however, the length of each sublateral should be determined carefully to assure appropriate performance and uniformity of emitter flow rates. The most accurate method is numerical trial and error, which is time-consuming. Many research efforts have been made to propose simple analytical design procedures. By using the power-law form of the Darcy-Weisbach formula, and equal emitters spacing for the sublaterals, Sadeghi et al. (2016) extended a previously introduced design solution for one-diameter laterals to tapered laterals. Recently, a simplified procedure to design dual-diameter drip laterals has b…

Biodiversity of the orophilous communities of Pino-Juniperetea class in the Central and Eastern Mediterranean area.

2000

The authors examine the orophilous communities, occuring in the Central and Eastern Mediterranean area, characterized by the dominance of trees and shrubs belonging to the genera Juniperus, Abies and Pinus. These communities are localized in the supra- and oromediterranean belt and show a relict role. From the structural point of view, this kind of vegetation is usually bistratified, with a low dense shrubby layer and spaced tree layer; sometime the latter one is absent. This vegetation is floristically poor and characterized by prevalence of Coniferous, such as Juniperus sabina, J. foetidissima, J. excelsa, J. oxycedrus. J. hemisphaerica, J. communis, J. nana, Abies nebrodensis, A. alba, A…

Climate Effects on Breeding Phenology of Peregrine and Lanner Falcons in the Mediterranean

2022

We explored the effects of weather on the timing and reproduction of the Mediterranean Peregrine Falcon Falco peregrinus brookei and the Lanner Falcon F. biarmicus feldeggii living on the Mediterranean island of Sicily. We found that the start date of incubation has changed during 1979–2019 and analysed whether incubation timing affected the productivity of both populations and whether the change of incubation date and the quality of breeding sites depended on climatic conditions. Overall spring temperature and rainfall increased on Sicily and the incubation date of the Peregrine and the Lanner Falcon has shifted to be about one week later over the time period 1979 to 2019. Linear mixed mod…

Factors affecting the diet of Peregrine Falcon in Italy

2016

The diet of top predators can provide useful information on phenology and abundance of their prey. The cosmopolitan and specialist Peregrine Falcon (Falco peregrinus) is an ideal model to assess whether food changes have occurred in the long-term. In this contribution, we reviewed all available literature on Peregrine Falcon diet in Italy which contained 11 detailed datasets useful for our review, and also included analysis of pellets, collected at three breeding sites of Sicily during 2014 and 2015. These data allowed us to shed light on the Peregrine Falcon’s diet over the last forty years (1978-2015). We calculated the numerical and biomass percentage of the resident and not-resident pre…

IN RICORDO DI PIETRO DODERLEIN (2 FEBBRAIO 1809 - 28 MARZO 1895)

2018

Gli autori ripercorrono le diverse fasi della lunga vita di Pietro Doderlein, che fu professore di zoologia prima a Modena (1839-1862) e poi a Palermo (1862-1894), appena dopo l’unificazione dell’Italia; a Modena contribuì notevolmente ad incrementare il museo di storia naturale dell’Università, a Palermo invece lo fondò di sana pianta e ne fece una struttura così ricca di esemplari da essere ancora oggi un riferimento importante a livello internazionale. Alla sua morte, nel 1895, lasciò una gran quantità di appunti che dimostravano che studiò tanto, scrisse molto, ma pubblicò poco. Grazie a molte carte inedite, custodite nell’Archivio Storico dell’Ateneo di Palermo, è stato possibile scopr…

A comparison of peregrine Falco peregrinus and lanner Falco biarmicus trophic niche in Sicily

2017

Prey availability is a crucial factor for the reproductive success of apex predators and the analysis of their diets can provide meaningful information about the quality of their habitats. In Sicily the declining lanner falcon Falco biarmicus feldeggii and the increasing peregrine falcon Falco peregrines brookei share similar habitats and trophic needs. By studying their current and past diets, we have investigated whether the characteristics of their foraging ecology could explain these different demographic trends. In 2014-2016, we identified 805 peregrine and 250 lanner Vertebrate prey from 15 peregrine and 6 lanner nests, and compared our dataset with previous data from Sicily (Peregrin…

Leaf-like Structure in the Photosynthetic, Succulent Stems of Cacti

1991

This research examined the hypothesis that as cacti evolve to the leafless condition, the stem epidermis and cortex become more leaflike and more compatible with a photosynthetic role. All cacti in the relict genus Pereskia have non-succulent stems and broad, thin leaves. All members of the derived subfamily Cactoideae are ‘leafless’, having an expanded cortex that is the plant's only photosynthetic tissue. In Pereskia, leaves have a high stomatal density (mean: 50.7 stomata mm−2 in the lower epidermis, 38.1 mm−2 in the upper epidermis), but stems have low stomatal densities (mean: 11.3 mm 2, three of the species have none). Stems of Cactoideae have a high stomatal density (mean: 31.1 mm−2,…