117,635 research outputs found
Malusio Turconi
No full textBotanico: Turconi, Malusio (1879-1929).
Titolo manoscritto sul recto, dove compare anche la nota: Alla Iconotheca Botanicorum del R.o Istituto Botanico di Padova.
Montata su cartone 164 x 111 mm.
1 fotografia : gelatina a sviluppo? ; 98 x 65 mm.
Vai alla scheda bibliografica: https://galileodiscovery.unipd.it/discovery/fulldisplay?context=L&vid=39UPD_INST:VU1&search_scope=MyInst_and_CI&tab=Everything&docid=alma99001566987020604
Torrential floods in the upper Soana Valley (NW Italian Alps): Geomorphological processes and risk-reduction strategies
No full textThis paper investigates two severe floods that occurred in the upper Soana Valley (NW Italian Alps) in September 1993 and October 2000. In both events, intense rainfall triggered violent inundations along the Soana stream and its lateral creeks, producing extensive damage to several small urban areas along the riverbeds. Comparing these two very similar flood events, which occurred 7 years apart, we tried to understand the reasons why the new remediation implemented along the riverbanks after the first flood of 1993 failed to protect houses and infrastructure during the flood of 2000. Numerous field surveys have been carried out since the flood of October 2000 to gather information about the instability on the slopes and along the streams as well as to assess damage
to the built environment. Physiography, geomorphology and land-use analyses were also performed using multitemporal aerial photographs and old maps. Additional information was collected using historical archives. The results highlight that land-use decisions, in particular urban planning and management that occurred in the 1960s and 1980s, along with design flaws in the flood defence infrastructure, in particular the rip-rap and reins built after the 1993 event, were responsible for the many collapses and damage suffered during the flood of 2000. An issue with such remediation projects is the wrongly held belief that these structures are perfectly adaptable to the typology and location in any geomorphodynamic context, regardless of the characteristics of the
basin and watercourse
Colata detritica del T. Bioley (15 ottobre 2000; Fenis, Valle d' Aosta). Analisi idrologica e geomorfologica
No full textDelayed neuronal maturation of the medullary arcuate nucleus in sudden infant death syndrome
No full textRecently, quantitative abnormalities in neuronal populations derived from the rhombic lip (inferior olive nucleus of the brain stem and external granular layer of the cerebellum) have been reported in victims of the sudden infant death syndrome (SIDS). In this study we examined the arcuate nucleus (ARCn) of 35 SIDS victims and 25 controls, to determine neuronal abnormalities involving this nucleus in SIDS. Computer-assisted cell evaluation was made on sections stained with hematoxylin and eosin to study the neuronal dimensions (nuclear and cytoplasmic area, nuclear/cytoplasmic ratio), the form factor and the density of reactive astrocytes. There was a significant reduction of the neuronal area (nuclear and cytoplasmic) in SIDS victims compared with controls. The neuronal populations of SIDS victims had a significantly higher form factor, index of immaturity. The SIDS victims were divided into two groups on the basis of ARCn development: 18 SIDS-A cases with a well-developed ARCn and 17 SIDS-B cases with severe bilateral hypoplasia. The results of our research indicate that the developmental defect is characterized by a reduction in size of the ARC neurons and by neuronal depletion. In SIDS the ARCn has the histomorphological features of neuronal immaturity, and there is a marked reduction of all quantitative cell parameters and lower astrocytes density with respect to controls. On the basis of the morphometric results of the arcuate neuronal populations, we hypothesize that infants whose neurons have failed to reach full maturity are at risk for SIDS because they are unable to develop appropriate cardioventilatory control
Man-made Terraces: From Ancient Anthropic Landscape Modification to Value at Risk. The Example of Cinque Terre and Portofino, Italy
No full textMan-made terraces for agricultural purposes are a quite diffuse and ancient anthropogenic landscape modification in mountainous areas. The original slope alteration, obtained through a sequence of sub-vertical and sub-planar surfaces, represents a human interference with the geomorphic system, altering the original balance of geomorphological and geo-hydrological factors. Stone walls and soil formed by human activity have been artificially immobilized on the slopes and are available again to gravitative processes once in abandonment and may be subject to deep degradation in case of intense rain events. However, socio-economic conditions play often a crucial role in the abandonment of terraces, indirectly contributing to increase gully erosion and walls failure. The modification of the original slope profile, due to its regular geometry in respect to the typical more complex natural surface, is rather suitable to be detected through remote sensing, particularly LIDAR, as many authors have recently demonstrated. In the present research the attention has been focused on the assessment of terraces and of the volume of stones and soil that have been involved by human activity. The research area is among the most deeply modified by terraces in the Mediterranean area and internationally famous for this landscape anthropogenic alteration: The Cinque Terre in Italy is a National Park intensively visited by tourists all over the year. Then terraces represent an important economic asset that need to be preserved from degradation and collapse as partially occurred in 2011 after the intense rain event that caused flood, hundreds of landslides and consequently damage. During the 2011 event many terraced slopes have collapsed with significant loss of soil and stone walls: the research allowed to evaluate the lost volumes and to estimate the remaining ones in the Vernazza catchment
Antitranspirant treatment on bean plants to counteract cold stress
No full textThe aim of the work was to test the efficacy of the antitranspirant Scudotherm® in preventing cold damages on Phaseolus vulgaris L. Two tests were conducted: the first between June-July 2018, and the second between May-June 2019. Plants were grown in a greenhouse, in plastic pots (10 pots/treatment), on a peaty substrate. Treatments were carried out on three-week-old plants, by foliar application 24 hours before the stress. The experimental design included treatments with Scudotherm® at 2% compared to an untreated and unstressed control, and to an untreated but stressed control (controls were sprayed with tap water). The cold stress was induced by placing the plants at 3-4 °C, for 48 hours. Both in vivo and destructive analyzes were performed to evaluate the health status of plants, immediately after stress and after a one-week recovery period. The analyzes were performed on three biological replications. No significant effect of the treatments was observed on chlorophylls in vivo, chlorophyll a fluorescence parameters, secondary metabolites (anthocyanins and phenolic index), and
lipid peroxidation. Significant variations were found in the metabolism of the sugars. Scudotherm® allowed maintaining the sucrose concentration similar to control and lower than stressed plants. During the first year, a similar behavior was also recorded for total sugars. These results suggested that Scudotherm® is able to mitigate some of the negative consequences of low temperatures, acting as a physical barrier on leaves, with an indirect physiological and biochemical effect
Analytical approach to geomorphological analysis, estimation of debris potential and hydraulic infrastructures in the Torrente Gravio basin (Susa Valley)
No full textThe study concerns the analysis of a mountain basin (Torrente Gravio, Susa Valley, Turin) from a geomorphological point of view, aimed to estimate the debris potential in order to assess suitability and current conditions of existing hydraulic infrastructures and to propose needed action. The methodological approach followed represents an example of an analysis that takes into consideration several elements: the climatic analysis, the historical research, the geomorphological analysis, the estimation of debris potential through an analytical procedure and, lastly, a critical analysis of existing and/or suggested hydraulic infrastructures based on other achieved results
The 4th October 2010 flash flood event in Genoa Sestri Ponente (Liguria, Italy)
No full textThe Mediterranean Sea and in particular the Liguria region have always been suffering from severe geohydrological events. Landform features and autumnal atmospheric circulation deeply influence the hazard in Genoa city, the capital of Liguria, crossed by many streams: heavy rainfall can trigger flash floods involving structures and infrastructures, often causing fatalities. The recent growth of events characterized by intense rainfall and floods has been amplified by the urban sprawl of flood-plain: these factors seem to be the most important causes in the increase of damage related to geo-hydrological events.
In this case, typical of the whole Genoan Metropolitan area, a severe event occurred in Sestri Ponente district on October 4th 2010: a critical rainfall, over 400 mm/6 hours, a peak of 125 mm/h, triggered shallow landslides and flash floods in the Molinassi and Chiaravagna catchments crossing Sestri Ponente, causing one fatality and damage of over 60 million euros. These watercourses show the typical features of Ligurian basins: small areas, steep slopes, proximity of watersheds to the coastline and intense urbanization of the plain. During this event, the hydrological response to rainfall was almost immediate, with times of concentration shorter than 25 minutes. The narrow plain on which Sestri Ponente rises was completely flooded
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