Search results for "Cave"

Imposte e Governance Regionale in Materia di Cave e Miniere in Italia

2013

Negli ultimi venti anni una crescente attenzione verso le problematiche ambientali ha generato un dibattito sul “green fiscal reform” sia a livello europeo che nei singoli stati membri. Anche in Italia si è assistito ad interventi normativi di natura centrale con la finalità di rivalutare alcuni strumenti a sostegno di politiche per la tutela dell’ambiente naturale. L’ambito delle imposte ambientali si caratterizza per lo stretto collegamento al contesto territoriale. Da un lato, infatti, le esternalità ricadono principalmente sugli abitanti delle aree interessate e dall’altro gli enti locali si trovano nella posizione migliore per valutarle e gestirle con gli strumenti di politica fiscale.…

Cross-Linked Imidazolium Salts as Scavengers for Palladium.

2014

Five imidazolium-based materials have been synthesised and used for the first time as palladium scavengers. Radical reactions of suitable bis-vinylimidazolium salts led to a series of insoluble materials through homo-polymerisation, immobilisation with a 3-mercaptopropyl-modified silica gel or co-polymerisation with ethylene glycol dimethylacrylate. These materials were screened as palladium scavengers with a set of palladium(0) and palladium(II) compounds in different solvents and at different starting amounts of palladium. In many cases, residual amounts of palladium were lower than 5 ppm, as requested for the manufacture of active pharmaceutical ingredients and fine chemicals. The applic…

Iron Induces Proliferation and Morphogenesis in Primmorphs from the Marine SpongeSuberites domuncula

2002

Dissociated cells from marine demosponges retain their proliferation capacity if they are allowed to form special aggregates, the primmorphs. On the basis of incorporation studies and septin gene expression, we show that Fe3+ ions are required for the proliferation of cells in primmorphs from Suberites domuncula. In parallel, Fe3+ induced the expression of ferritin and strongly stimulated the synthesis of spicules. This result is supported by the finding that the enzymatic activity of silicatein, converting organosilicon to silicic acid, depends on Fe3+. Moreover, the expression of a scavenger receptor molecule, possibly involved in the morphology of spicules, depends on the presence of Fe3…

The carabid Pterostichus melanarius uses chemical cues for opportunistic predation and saprophagy but not for finding healthy prey

2017

The sentinel prey method can quantify predation pressure in various habitats. Real prey is assumed to more realistically mimic the predator experience but the predator can rarely be identified. Artificial prey made of plasticine may lack real chemical cues, but provides information about predator identity. However, the relationship between predation pressure registered by artificial versus real prey is not clear. We tested the relative attractiveness of artificial caterpillars, and intact, wounded, or dead larvae of the cabbage moth (Mamestra brassicae) for the carabid predator Pterostichus melanarius Illiger (Coleoptera: Carabidae). P. melanarius adults were attracted to dead caterpillars …

Appropriate technology in a Solovian nonlinear growth model

2007

We propose a Solovian growth model with a convex-concave production function and international technological spillovers. We test the empirical implications of the model, analysing the effects of the productivity slowdown that followed the oil shocks of the 1970s. We argue that this slowdown, altering the world income distribution, affected the pattern of international technological spillovers, taking the poorest countries further away from the technological leaders, and therefore unable to exploit their technologies. The result is the emergence of a poverty trap for low-income countries.

The magnesium isotope record of cave carbonate archives

2012

Here we explore the potential of magnesium (δ<sup>26</sup>Mg) isotope time-series data as continental climate proxies in speleothem calcite archives. For this purpose, a total of six Pleistocene and Holocene stalagmites from caves in Germany, Morocco and Peru and two flowstones from a cave in Austria were investigated. These caves represent the semi-arid to arid (Morocco), the warm-temperate (Germany), the equatorial-humid (Peru) and the cold-humid (Austria) climate zones. Changes in the calcite magnesium isotope signature with time are compared against carbon and oxygen isotope records from these speleothems. Similar to other proxies, the non-trivial interaction of a …

Bunker Cave stalagmites: an archive for central European Holocene climate variability

2012

Holocene climate was characterised by variability on multi-centennial to multi-decadal time scales. In central Europe, these fluctuations were most pronounced during winter. Here we present a record of past winter climate variability for the last 10.8 ka based on four speleothems from Bunker Cave, western Germany. Due to its central European location, the cave site is particularly well suited to record changes in precipitation and temperature in response to changes in the North Atlantic realm. We present high-resolution records of δ<sup>18</sup>O, δ<sup>13</sup>C values and Mg/Ca ratios. Changes in the Mg/Ca ratio are attributed to past meteoric p…

Keinotodellisuuden soveltamismahdollisuudet ihmisläheisissä tieteissä

2007

The Reason of Imagination. The Blazing Worlds of Margaret Cavendish and Siri Hustvedt

2020

One of the peculiarities of 17th and 18th centuries literature is the link between knowledge and imagination, a relationship in which narration sometimes accompanies science, sometimes goes beyond it. The idea of imagination as a true means of knowledge is the subject of Margaret Cavendish’s best known work, The Blazing World (1666), where her alter ego is free to built a whole social and philosophical system based on corporality and subjectivity. From the same conception of imagination starts Siri Hustvedt when in 2014 rewrites The Blazing World: the story of an artist who still in the twentieth century tries to face the overwhelming misogyny with the performance of the body and the theory…

N-acetylcysteine protects against age-related increase in oxidized proteins in mouse synaptic mitochondria.

1997

Since it has been proposed that oxidized protein accumulation plays a critical role in brain aging, we have investigated the effect of a thiolic antioxidant on protein carbonyl content in synaptic mitochondria from female OF-1 mice. At 48 weeks of age, a control group was fed standard food pellets and another group received pellets containing 0.3% (w/w) of N-acetylcysteine. A 24-week treatment resulted in a significant decrease in protein carbonyl content in synaptic mitochondria of the N-acetylcysteine-treated animals as compared to age-matched controls.