Search results for "leave"
showing 10 items of 372 documents
Contributo alla conoscenza degli effetti dell'inquinamneto atmosferico su foglie di Eucalyptus camaldulensis ed E. Globulus (Myrtaceae)
2012
Contribution to the knowledge of air pollution effects on Eucalyptus camaldulensis and E. globulus (Myrtaceae) leaves -.This study deals with the metal storage found in Eucalyptus camaldulensis and E. globulus leaf structures. The cytological and chemical analysis were carried out on samples from the city of Agrigento and its surroundings. The investigation pointed out that the the most evident alterations are phenolic storage and distinctive cellular modification. These features appear related to the greater presence of trace elements within the sites that are more exposed to intense vehicular traffic. Winter samples, moreover, have more evident structural modifications due to a bigger con…
Essential oils composition of Periploca laevigata Aiton subsp. angustifolia (Labill.) Markgraf (Apocynaceae – Periplocoideae)
2012
The essential oil of roots, branches, leaves, flowers and fruits of Periploca laevigata Aiton subsp. angustifolia (Apocynaceae) from Lampedusa Island has been obtained by hydrodistillation and its composition analysed. The analyses allowed the identification and quantification of 86 volatile compounds. Branches showed the higher diversity with 57 compounds followed by fruits with 33, roots with 23, flowers with 16 and leaves with six compounds, respectively. In the matrices examined three constituents, heneicosane, docosane and tricosane are in common, although with different percentages. At least the most abundant compounds found in the matrices have been reported to have several biologica…
Effect of different substrata on rhizome growth, leaf biometry and shoot density of Posidonia oceanica
2013
The effects of different substratum typologies on Posidonia oceanica growth and morphology were estimated in four Sicilian meadows using Generalized and Linear Mixed Models combined with retrodating and biometric analyses. Substratum exerted a multiple effect, resulting in different biometric features for P. oceanica shoots settled on rock from those growing on sand and matte. On rock, values for growth rate, leaf length and shoot surface were lower than those on other substrata, with 42%, 23% and 32% the highest degree of difference respectively. The present study may have interesting methodological consequences for the comprehensive understanding of the causative variables potentially aff…
Carbon and nitrogen isotopic values in Lithops aucampiae during leaf development.
2021
Abstract Lithops (Aizoaceae) are succulent plants consisting of a pair of opposite succulent leaves inserted on an extremely short stem. The apical meristem produces a new leaf pair that develops between the older pair, recycling water and metabolites. This peculiar anatomy and growth form make ecophysiological studies quite challenging. Lithops are considered to have CAM metabolism, though experimental evidence is scarce. We followed the changes in carbon and nitrogen isotopic values in mature leaves, young leaves and roots, with the aim of investigating how the use of resources is optimized to achieve survival in extremely arid environments. Two-year-old plants of Lithops aucampiae were g…
L'orario di lavoro nel diritto dell'Unione Europea
2015
L’articolo analizza la normativa europea in materia di orario di lavoro (dir. 2003/88/CE) per come interpretata dalla Corte di Giustizia. Più in particolare vengono discusse le nozioni di orario e tempi di lavoro e la regolamentazione di ferie, lavoro notturno, riposi giornalieri e settimanali, e le discipline speciali; specifica attenzione è dedicata alle deroghe che secondo la direttiva possono essere apportate dall’autonomia collettiva ed individuale alla disciplina legale, per sottolineare come il diritto dell’Unione abbia determinato una marcata liberalizzazione dei tempi di lavoro. The present work analyses the EU legislative framework on working time (dir. 2003/88/EC) and the related…
Female work, family meeds and equal opportunity: a comparative analysis among EU legal systems
2013
Who are children in care and care leavers
2020
The chapter focuses on the characteristics and experiences of minors accepted in public structures and care leavers. Most of the children housed in the facilities come from problematic families, punctuated by recurrent crises. Precisely for this reason in many European countries the awareness has matured that the minors accepted in the social-welfare structures are strongly disadvantaged compared to their peers, as their life is generally marked by traumas and contexts of educational poverty and psychological poverty which they do not allow adequate psycho-social development.
Leaders as role models: Effects of leader presenteeism on employee presenteeism and sick leave
2020
There is a broad consensus that associations exist between leadership behaviour and employee health. However, much less is known about potential mediating processes underlying links between specifi...
Bioprospective of Sorbus aucuparia leaf extract in development of silver and gold nanocolloids
2010
At the present time the bioprospective field is a dynamic area of research. The rapid biosynthesis of silver and gold nanoparticles without using toxic chemicals is reported here. Sorbus aucuparia is omnipresent in Europe. The aqueous leaves extract of the plant were used as reducing agent for the synthesis of silver and gold nanoparticles from their salt solutions. The synthesized nanoparticles were spherical, triangular and hexagonal in shape with an average size of 16 and 18nm for silver and gold, respectively. Different extract quantities, metal concentrations, temperatures and contact times were investigated to find their effect on nanoparticles synthesis. The resulting silver and gold…
Protocol for development of various plants leaves extract in single-pot synthesis of metal nanoparticles
2012
This article is aimed to extend a simple protocol for preparation of various plant leaves extract and their application to green synthesis of the metallic nanoparticles. Five plant leaves extract showed mild reduction and stabilization ability for silver and gold nanoparticles (AgNPs and AuNPs) at room temperature. The particle size range varied from 25 to 42 nm and 21 to 47 nm for AgNPs and AuNPs, respectively. Plant leaves extract-mediated nanoparticles were characterized to confirm the shape, size, crystallinity, and content using different spectroscopic investigations. Differences in stability of nanoparticles at different pH were also measured by zeta potential.