Search results for " Regionalization"

Cuticular hydrocarbon profiles differ between ant body parts: implications for communication and our understanding of CHC diffusion.

2020

Abstract Insect cuticular hydrocarbons (CHCs) serve as communication signals and protect against desiccation. They form complex blends of up to 150 different compounds. Due to differences in molecular packing, CHC classes differ in melting point. Communication is especially important in social insects like ants, which use CHCs to communicate within the colony and to recognize nestmates. Nestmate recognition models often assume a homogenous colony odor, where CHCs are collected, mixed, and redistributed in the postpharyngeal gland (PPG). Via diffusion, recognition cues should evenly spread over the body surface. Hence, CHC composition should be similar across body parts and in the PPG. To te…

Brevi considerazioni su piogge intense e potenzialità di produzione del deflusso superficiale in Sicilia

2013

Vengono presentati i metodi aggiornati per la stima delle precipitazioni intense massime annue di fissato tempo di ritorno in Sicilia. Dall‟osservazione della distribuzione spaziale dei parametri assunti nei modelli di stima emergono aree a maggior rischio riguardo l‟intensità di pioggia, qui commentate. Il richiamo a recenti studi che riguardano la produzione del deflusso superficiale a scala media annua o a scala di evento, consente di avanzare alcune considerazioni di tipo spaziale, con particolare attenzione all‟area del messinese, su questa importante propensione idrologica notoriamente fonte di dissesto idrogeologico e di pericolo alluvionale. The updated methods for the estimation of…

Annual runoff regional frequency analysis in Sicily

2009

Abstract This paper performs annual runoff frequency analysis in Sicily, Italy using the index runoff method. Homogeneous regions, not necessarily defined by geographical boundaries but sharing common features from a morphologic and climatic standpoint, have been identified. For each region a single probability distribution function can be fitted to the available annual runoff data scaled by the index runoff. Starting from an initial dataset of 105 hydrometric stations, 57 stations have been selected using heuristic criteria associated with the Hosking and Wallis’s discordancy measure. The Mantel tests have been then applied to find out the physical and morphological parameters best correla…

Regional flow duration curves for ungauged sites in Sicily

2011

Abstract. Flow duration curves are simple and powerful tools to deal with many hydrological and environmental problems related to water quality assessment, water-use assessment and water allocation. Unfortunately the scarcity of streamflow data enables the use of these instruments only for gauged basins. A regional model is developed here for estimating flow duration curves at ungauged basins in Sicily, Italy. Due to the complex ephemeral behaviour of the examined region, this study distinguishes dry periods, when flows are zero, from wet periods using a three parameters power law to describe the frequency distribution of flows. A large dataset of streamflows has been analysed and the param…

Regional-scale modeling of reference evapotranspiration: Intercomparison of two simplified temperature- and radiation-based approaches

2015

Two regionalized models for the distributed estimation of daily reference evapotranspiration, the temperature-based Hargreaves (HE) and the radiation-based Makkink (MK) equations, are applied in Southern Italy during the years 2007 and 2008. Spatially distributed meteorological inputs, such as air temperature and incoming solar radiation, were derived from geostatistical interpolation of ground data and from the Land Surface Analysis Satellite Application Facility (LSA-SAF) surface radiation product, respectively. Comparison of the latter with 83,394 daily measurements provided by 128 weather stations shows a not negligible seasonal error in daily solar radiation that is corrected by means …

Role of en and novel interactions between msh, ind, and vnd in dorsoventral patterning of the Drosophila brain and ventral nerve cord

2010

AbstractSubdivision of the neuroectoderm into discrete gene expression domains is essential for the correct specification of neural stem cells (neuroblasts) during central nervous system development. Here, we extend our knowledge on dorsoventral (DV) patterning of the Drosophila brain and uncover novel genetic interactions that control expression of the evolutionary conserved homeobox genes ventral nervous system defective (vnd), intermediate neuroblasts defective (ind), and muscle segment homeobox (msh). We show that cross-repression between Ind and Msh stabilizes the border between intermediate and dorsal tritocerebrum and deutocerebrum, and that both transcription factors are competent t…

Mikroregiony fizyczno-geograficzne Opolszczyzny

2017

Urban Regionalisation Processes : Governance of Post-Urban Phenomena in Sicily

2021

The critical reflection on modern cities, that continued through the 20th century, has fed a wide- ranging and controversial debate within urban studies. The theoretical category of “urban” as a spatial, social product as well as being an economic and political one, has changed via new settlement principles, an expression of “new forms of cities” and also of new “city demand”, and of the various use practices that produce and are produced in these new territories. This book tries to answer the questions on transformation phenomena of urban dimension (regionalization processes), for which the interpretations provided in reference literature are not totally convincing. In fact, traditional re…

Key-indicators for maternity hospitals and newborn readmission in Sicily

2017

This paper proposes a composite indicator for the classification of maternity units, which takes into account for the different dimensions of service delivery, as potential predictors of health outcomes. As a measure of outcome, infant readmissions is considered, being a proxy of morbidity. The results highlight that after controlling for risk factors of the newborn, and for the presence of neonatal intensive unit, infants born in lower level hospitals show readmission rates higher than infants born in higher level hospitals.

Propozycja regionalizacji fizycznogeograficznej Sudetów Wschodnich

2018

Artykuł przedstawia propozycję wyznaczenia granic Sudetów Wschodnich oraz podziału fizycznogeograficznego makroregionu na mezoregiony. Przy wyznaczaniu granic uwzględniono w większym stopniu genetyczno-geologiczny podział Sudetów związany z orogenezą waryscyjską. W podziale na mezoregiony w większym stopniu uwzględniono kryteria litostratygraficzne.