4,831 research outputs found
Presentazione
No full textLa presentazione introduce i contributi del volume, pensato per raccogliere le analisi e le riflessioni legate al tema dell'educazione e della politica, affondando i concetti di: cittadinanza e diritti, qualità della vita, ambiente, conflitto, memoria e identità
Angiolo Mazzoni
No full textEngineer and Architect, Mazzoni is famous for his numerous projects and completed works, mainly comprising
public buildings, train stations and post offices. In 1919 he obtained a degree in engineering at the Scuola di Applicazione per Ingegneri, where he studied under G. Giovannoni, G.B. Milani, and V. Fasolo. Subsequently he
attended Bologna’s Accademia di Belle Arti, where he obtained a degree in architecture in 1923 As most of his work presents a wide use
of experimentation and different styles, it is hard to find a common denominator. Moreover, during his training he was
also influenced by the monumental and traditional styles typical of Piacentini, whose studio Mazzoni frequented for more than one year starting from 1920.
Angiolo Mazzoni worked for most of his professional career, and on a more steady basis from 1925‐1926 onwards, as a chief engineer for the Ministry of Communications
Reduced level of the histone deacetylase Sir2 in mRNA decapping mutants leads to silencing defects and premature aging
No full textRNA metabolism directly or indirectly impacts various cellular pathways.
Mutations in factors involved in mRNA decapping result in phenotypic markers of apoptosis and lead to premature aging. These traits are accompanied by elevated histone mRNA levels persisting throughout the cell cycle and defects in S-phase progression.
Here we show that decapping mutants exhibit low levels of Sir2, which reduces silencing and leads to the elevated transcription of rDNA intergenic spacer regions.
We postulate that defects in decapping are associated with the derepression of silencing at heterochromatic-like regions. This, in turn, may affect histone modification and induce loss of silencing at specific loci, as well as recombination within rDNA repeats, both of which have been shown to regulate cellular lifespan.
References
[1] Mazzoni C, Falcone C. Biochem Soc Trans. (2011), 39(5):1461-5. Review.
[2] Mroczek S & Kufel J (2008).Nucleic Acids Res 36, 2874-2888.
[3]Mazzoni C, Herker E, Palermo V, Jungwirth H, Eisenberg T, Madeo F & Falcone C (2005).EMBO Rep 6, 1076-108.
[4]Palermo V, Cundari E, Mangiapelo E, Falcone C & Mazzoni C (2010).Cell Cycle 9, 3991-3996.
[5] Thompson DM & Parker R (2007).Mol Cell Biol 27, 92-101
Continuous or not continuous: insights into some temporal features of the female signals of Brown Marmorated Stink Bug (Halyomorpha halys) to improve attraction towards males.
No full textThe Brown Marmorated Stink Bug (BMSB), Halyomorpha halys (Stål, 1855), is an alien insect
belonging to the family Pentatomidae (Hemiptera), and a native of south-east Asia that was
recently introduced into Italy. The control of this pest requires the massive use of insecticides,
which however are not effective or sustainable. In this way, the adoption of IPM solutions by
using a multi-strategy approach (e.g. aggregation pheromone lures, parasitoids, etc) could be
an important alternative. Recent experiments have shown that BMSB communicates using
vibrational signals and that males are attracted by a female song. The aim of our experiment
was to select between two different song playback types (continuous and discontinuous) to find
the more effective method to attracting the males.
A laser vibrometer was used to monitor the playback signals emitted by a mini-shaker from
the surface of a bean plant leaf. The playbacks consisted of a pre-recorded female signal that
was transmitted either continuously or with regular silent pauses (4s of song + 6s of silence) in
trials of 5 min. Males (n = 30) were given 5 min to reach the tip of the mini-shaker on a bean
plant.
Our results indicated that, when stimulated with continuous signal, 13 males reached the
target, while 25 males showed the typical searching behaviour (“run-listen-run”). The
discontinuous signal proved to be significantly less efficient in attracting males: only 6 males
reached the target and only 12 showed the “run-listen-run” behavior. We concluded that the
use of a continuous playback signal looks more promising for the implementation of BMSB
traps
Popovič T., A.S. Puškin v dialoge s drugim: monografija. (Nižnij Novgorod, 2018)
No full textRecensione al libro di T.Popović: Puškin v dialoge s drugi
Educazione e Politica. Che fare?
No full textUn viaggio nella memoria, nell'esperienza, nel conflitto, all'interno dell'ambiente che ci circonda e nel più profondo concetto di cittadinanza attraverso una continua correlazione tra teoria e prassi. Questo il percorso del presente volume che si riferisce in larga misura ai contenuti del Convegno internazionale 'Educazione e Politica, che fare?' tenutosi a Bologna nei primi giorni di novembre 2002: quello cioè di trentare di decifrare la possibilità, oggi così gravemente minacciata, di ritrovare il senso della politica. Al libro hanno contribuito alcuni studiosi e operatori di livello, appartenenti sia al mondo universitario, sia ad alcune realtà politico- sociali
Le Tiflocibine dannose alle lamiacee aromatiche in Toscana
No full textLeafhoppers harmful to aromatic Lamiaceae in Tuscany
Field surveys conducted during the biennium 2003-2004 on 6 species of aromatic Lamiaceae (Melissa officinalis L., Origanum vulgare L., Calamintha nepeta Savi, Hyssopus officinalis L., Salvia officinalis L., and Rosmarinus officinalis L.) cultivated in several areas of Tuscany, evidenced the occurrence of a complex of harmful leafhoppers belonging mainly to the genus Eupteryx. Among these, Eupteryx decemnotata Rey resulted the most recurrent species, collected on all the monitored plants throughout the year. Other species commonly found were E. curtisii (Flor), E. rostrata Rib., E. zelleri (Kbm.), E. melissae (Curtis), and Emelyanoviana mollicula (Boh.). Notes regarding the biology of these species and a key for their identification, on the basis of external macro-morphological characters, are given
Dynamic analyses for the optimization of a pest control system based on vibrations
No full text: In many Hemipteran insects, vibrational communication is fundamental for reproduction in that it can provide cues that enable partner identification, location and courtship. If this communication fails, none of the previous actions will be possible and the species reproduction is compromised. From this concept, a new method of pest control, an alternative to pesticides, is currently under development: the vibrational mating disruption, which is based on the use of disturbance noise (DN, i.e., disruptive synthetic vibrations specifically designed to interfere with the mating communication). In this study, we describe from an engineering point of view this method, applied in the field for the control of the grapevine leafhoppers Scaphoideus titanus and the Empoasca vitis. In order to prevent mating, the DN is continuously transmitted by a system of mini-shakers through the vineyard, from the trellis (i.e., poles and wires) to the grapevine leaves. The DN can disrupt the target species because of its specific frequency pattern and provide the respect of certain threshold of intensity. For these reasons, (i) we must reduce all the possible causes of dissipation and/or (ii) optimize the signal transmission at the source i.e. the mini-shakers. Since this method is applied in the field, many uncontrollable factors can contribute to dissipating the signal (materials, junctions, external perturbations just to name a few). Therefore, in the first instance, we decided to focus on the mini-shaker position to enhance its performance. In this study, we report our dynamic analysis of the shakers to suggest some changes, by varying the shaker assembly, stiffness, mass and position, and so generate improvements on the quality and the intensity of the signal to be transmitted. Both numerical (finite element) simulations and field measurements are shown to validate the proposed solutions
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