Search results for "ASTER"
showing 10 items of 2223 documents
(A,B) In vivo GCaMP6f signals recorded in layers M1, M5 and M9/10 of Mi1 (A) and Tm3 (B) neurons, before (blue, green) and after (gray, red) applicat…
2019
Sensory systems sequentially extract increasingly complex features. ON and OFF pathways, for example, encode increases or decreases of a stimulus from a common input. This ON/OFF pathway split is thought to occur at individual synaptic connections through a sign-inverting synapse in one of the pathways. Here, we show that ON selectivity is a multisynaptic process in the Drosophila visual system. A pharmacogenetics approach demonstrates that both glutamatergic inhibition through GluClα and GABAergic inhibition through Rdl mediate ON responses. Although neurons postsynaptic to the glutamatergic ON pathway input L1 lose all responses in GluClα mutants, they are resistant to a cell-type-specifi…
A model of degassing for Stromboli volcano
2010
International audience; A better understanding of degassing processes at open-vent basaltic volcanoes requires collection of new datasets of H2O–CO2–SO2 volcanic gas plume compositions, which acquisition has long been hampered by technical limitations. Here, we use the MultiGAS technique to provide the best-documented record of gas plume discharges from Stromboli volcano to date. We show that Stromboli's gases are dominated by H2O (48–98 mol%; mean, 80%), and by CO2 (2–50 mol%; mean, 17%) and SO2 (0.2–14 mol%; mean, 3%). The significant temporal variability in our dataset reflects the dynamic nature of degassing process during Strombolian activity; which we explore by interpreting our gas m…
Spatially resolved SO2 flux emissions from Mt Etna
2016
Abstract We report on a systematic record of SO2 flux emissions from individual vents of Etna volcano (Sicily), which we obtained using a permanent UV camera network. Observations were carried out in summer 2014, a period encompassing two eruptive episodes of the New South East Crater (NSEC) and a fissure‐fed eruption in the upper Valle del Bove. We demonstrate that our vent‐resolved SO2 flux time series allow capturing shifts in activity from one vent to another and contribute to our understanding of Etna's shallow plumbing system structure. We find that the fissure eruption contributed ~50,000 t of SO2 or ~30% of the SO2 emitted by the volcano during the 5 July to 10 August eruptive inter…
Lidar detection of carbon dioxide in volcanic plumes
2015
Volcanic gases give information on magmatic processes. In particular, anomalous releases of carbon dioxide precede volcanic eruptions. Up to now, this gas has been measured in volcanic plumes with conventional measurements that imply the severe risks of local sampling and can last many hours. For these reasons and for the great advantages of laser sensing, the thorough development of volcanic lidar has been undertaken at the Diagnostics and Metrology Laboratory (UTAPRAD-DIM) of the Italian National Agency for New Technologies, Energy and Sustainable Economic Development (ENEA). In fact, lidar profiling allows one to scan remotely volcanic plumes in a fast and continuous way, and with high s…
Beyond early: Decision support for improved typhoon warning systems
2015
International audience; Warnings can help prevent damage and harm if they are issued timely and provide information that help responders and population to adequately prepare for the disaster to come. Today, there are many indicator and sensor systems that are designed to reduce disaster risks, or issue early warnings. In this paper we analyze the different systems in the light of the initial decisions that need to be made in the response to sudden onset disasters. We outline challenges of current practices and methods, and provide an agenda for future research.To illustrate our approach, we present a case study of Typhoon Haiyan. Although meteorological services had issued warnings; relief …
Relazioni tra parametri biometrici in Marthasterias glacialis (L.) (Asteroidea)
2013
Biometric parameters of the Asteroid echinoderm Marthasterias glacialis (L.) were measured at Ustica Island MPA (SW Tyrrhenian Sea). Wet weight was correlated with tip-to-tip (arm-span) diameter, central disk, arm length, arm width and arm height. Results show high positive correlation between weight and arm height, suggesting a new useful method to estimate starfish size also for in situ measurements.
HIGH-RESOLUTION SEISMIC SURVEY IN THE WESTERN CALABRIA AND EASTERN SICILY OFFSHORE: IMPLICATIONS WITH VERTICAL TECTONICS
2016
High-resolution seismic data acquired along the continental shelf/upper slope offshore of Capo Vaticano (western Calabria), Milazzo Promontory and Mt. Etna (eastern Sicily) allow to provide new insights on vertical mobility related to active tectonics. A number of depositional sequences bounded by unconformities or correlative para-conformities were recognized on Sparker profiles in the first 200-300 m below the sea-floor. The most recent sequence overlays a widespread erosional surface that ostensibly formed during the sea level stillstand of the Last Glacial Maximum (LGM), whereas a stack of depositional sequences, which are interpreted as representing the falling and low-stand systems tr…
The reasons why the leaders of political parties are replaced. The Polish case
2015
Artykuł podejmuje kwestię przyczyn zmian przywódców w polskich partiach politycznych. Pod uwagę wzięto dwa główne czynniki, które – zgodnie z przyjętymi w środowisku naukowym poglądami – w sposób decydujący warunkują czas trwania na stanowisku. Po pierwsze, przeprowadzono analizę formalnych procedur związanych z odwoływaniem liderów partii politycznych zawartych w statutach partyjnych. Po drugie, przedstawiono wpływ wyniku wyborczego (uzyskane głosy i fakt zawiązania bądź nie koalicji gabinetowej) na zdolność liderów do utrzymania się na stanowisku. Analiza objęła partie polityczne, które uzyskały mandaty w wyborach do Sejmu przeprowadzonychw2011 r., a więc Prawo i Sprawiedliwość, Platformę…
Neiromediatora serotonīna ietekme uz augļu mušu (Drosophila melanogaster) kustību lateralitāti
2022
Augļu mušu (Drosophila melanogaster) depresīvā uzvedības modeļa izpēte ar y-tipa labirinta metodi, var palīdzēt saprast depresīvās uzvedības pamatelementus. Augļu mušas ir labi pazīstams un plaši pielietojams modeļobjekts bioloģijas nozares pētījumos, ir zināms, ka serotonīna sintēzes cikls ir evolucionāri konservatīvs, līdzīgs visiem dzīvniekiem, tāpēc ir svarīgi apzināties kādus ķīmiskos līdzekļus vislabāk pielietot tālakos uzvedības pētījumos. Darba mērķis ir izpētīt vai selektīvie serotonīna inhibitori ietekmē augļu mušu Oregon R kustību lateritāti. Kopā pētījumā analizēti, selektīvā serototonīna atpakaļpiesaistes inhibitora escitaloprāma un, vielas ar antidepresīvām īpašībām, triptofān…
Testing a methodology to improve organizational learning about crisis communication
2011
Purpose – The purpose of this paper is to introduce a measurement system with performance indicators to improve organizational learning about crisis communication by public organizations. The tool can be used to conduct a preparedness audit or to evaluate communication performance in a real situation or in an emergency exercise. Evaluation is part of the strategic planning and development of crisis communication. The construction of the instrument and its theoretical underpinnings are first explained, after which the series of empirical tests that were implemented to scrutinize the clarity and appropriateness of the indicators as well as the usability of the instrument are presented. Design…