Search results for "Lava"
showing 10 items of 456 documents
Environmental features and land use of Etna (Sicily — Italy)
2007
Etna is the greatest volcano in Europe and one of the most active in the world. It is a complex strata-volcano formed of lava flows alternating with pyroclastic materials emitted over various eruptive areas which have, over centuries, built up the actual volcano. The climate in the Etna area is basically Mediterranean but rainfall and temperatures are affected by height, exposure of slopes, by winds and by clouds coming from the coast. Temperature distribution is uniform but rainfall is irregular. Moist winds from the sea bring rain to the eastern slopes. Surveys on the pedoclimate show an udometric regime ranging, according to altitude, from xeric to udic and a thermometric regime ranging …
Intervento di ripristino della copertura arborea su un'area del parco dell'Etna interessata da colata lavica recente.
1996
The planning and results of a reafforestation carried out on a private area occurring in the Etna Wildlife Reserve C zone are presented. The area consists of a terraced slope 70.000 square meters wide, made out of a lava flow part which dates back to 1983. At first were planted and seeded Astragalus siculus Biv. and Festuca circummediterranea Patzke, in order to set a pioneer vegetation cover; then were planted some aboreal species having a leading role in the physiognomical characterisation of the Etna landscape, like Betula aetnenis Raf., Pinus laricio Poiret, Populus tremula L. The success of the intervention is shown by the fairly quick penetration of 26 species coming from the neighbou…
L'Europe et le monde colonial au XVIIIe siècle
2013
Variant les approches et les contextes, les contributions de ce volume étudient les échanges, les rapports de pouvoir et de domination, les médiations et les transformations, les interactions et les transferts culturels entre les États européens et leurs colonies dans les espaces américains et asiatiques à l'âge des Lumières. Le phénomène colonial a, par son caractère protéiforme, permis de croiser les regards dans un esprit d'interdisciplinarité stimulante et féconde comme en témoigne la nouveauté des perspectives développées ici. Autour de l'idée de représentation - définie comme production d'images et de figures aux sens culturel, identitaire, politique et esthétique du terme - sont réun…
Explosive origin of silicic lava: Textural andδD–H 2 O evidence for pyroclastic degassing during rhyolite effusion
2014
A long-standing challenge in volcanology is to explain why explosive eruptions of silicic magma give way to lava. A widely cited idea is that the explosive-to-effusive transition manifests a two-stage degassing history whereby lava is the product of non-explosive, open-system gas release following initial explosive, closed-system degassing. Direct observations of rhyolite eruptions indicate that effusive rhyolites are in fact highly explosive, as they erupt simultaneously with violent volcanic blasts and pyroclastic fountains for months from a common vent. This explosive and effusive overlap suggests that pyroclastic processes play a key role in rendering silicic magma sufficiently degassed…
Halogen (Cl, F) release during explosive, effusive, and intrusive phases of the 2011 rhyolitic eruption at Cordón Caulle volcano (Chile)
2019
We investigate sulphur, chlorine and fluorine release during explosive, effusive and intrusive phases of the 2011 Cordon Caulle eruption, with a focus on halogen devolatilization. Petrological analysis shows halogen release to have been promoted by isobaric crystallization in slowly-cooled magma that was emplaced in a lava flow and sub-vent intrusion. Fluorine in particular mobilized only after extensive groundmass crystallization and incipient devitrification. By 2017, the gas emitted from vent-proximal fumaroles had hydrothermal compositions, with HCl/HF ratios decreasing with decreasing temperature. We estimate that the eruption could eventually emit up to 0.84 Mt of SO2, 6.3 Mt of HCl, …
Eye fluke infection and lens size reduction in fish: a quantitative analysis.
2008
Parasites have a variety of harmful effects on their hosts, some of which may be overlapping or complementary and thus easily overlooked but which are still important for the overall severity of infection. We investigated the effect of Diplostomum sp. eye fluke infection on the size of the eye lens in a range of wild and farmed fish species and those exposed to controlled parasite infection. We found that asymmetry in intensity of infection between the right and left lens of an individual fish affected lens size such that the lens with the higher intensity of infection was smaller. Interestingly, however, this was observed only in 3 of the 10 species studied (whitefish, smelt and sea trout)…
Latvijas medus kvalitātes un autentiskuma parametru izvērtējums
2017
Darba literatūras daļā ir dota informācija par medu un tā patēriņu un ražošanu Latvijā un pasaulē, medus viltošanu un kvalitātes parametriem, analītiskās metodes medus kvalitātes rādītāju noteikšanai, šķidruma hromatogrāfijas un masspektrometrijas pielietojums polifenolu analīzē, statistiskās un datu apstrādes metodoloģijas medus ģeogrāfiskās izcelsmes noteikšanai. Darbā ir veiktu flavonoīdu, fenolo skābju, vitamīnu un augu hormonu noteikšanas metodes izstrāde un validācija medū. Pēc tam ar šo metodi ir noteikts medus sastāvs 394 Latvijas medus paraugos un 35 Gruzijas medus paraugos, kas pēc tam savā starpā tiek salīdzināts, izmantojot literatūras datus un galveno komponentu analīzi.
Dietary flavonols and flavan-3ols as modulators of superoxide radicals production: opposite dose-dependent effects
2012
Modulating activity of dietary flavonols and flavan-3ols on the enzymes xanthina oxidase (XO) and mitochondrial superoxide dismutase (Mn-SOD)
2012
La figura di Zosima, padre "autorevole", nella leggenda di Maria Egiziaca
2014
The legend of saint Maria Aegyptiaca knew a large diffusion in hagiographical tradition, between East and West, from VI-VII century to the end of the Middle Ages. Together with Maria, father Zosima is the most important figure of the legend (a true “deuteragonist” of the narrative plot). He meets the heremitic woman in the wilderness of Palaestina and has a particular relation with her, founded on deference and devotion, till the death and the engraving of the old Maria. The type of father Zosima, in the various versions of the story, obtains different cures by the poets and the authors. By some select specimens (essentially taked from Hildebertus of Lavardin’s «Vita beate Marie Egiptiace» …