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  • 1
    Monograph available for loan
    Monograph available for loan
    Studio geologico applicato e geofisico per dighe subalvee nel distretto del nogal (Somalia settentrionale) (1979)
    Padova : Società Cooperativa Tipografica
    Details Availability
    Call number: M 327
    Type of Medium: Monograph available for loan
    Pages: 33 S.
    Series Statement: Istituti de Geologia e Paleontologia dell'Università degli Studi 〈Milano〉 : N.S. : Pubblicazione 295
    Location: Upper compact magazine
    Branch Library: GFZ Library
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  • 2
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    Late Cenozoic shelf delta development and Mass Transport Deposits in the Dutch offshore area – results of 3D seismic interpretation (2012)
    Cambridge University Press
    Details
    Publication Date: 2012-12-01
    Description: In this study, seismic stratigraphic criteria have been used to characterise the evolution of the Southern North Sea (SNS) shelf-delta system that progressively filled the Southern North Sea basin during Plio-Pleistocene times. Based on the prograding and down-stepping architecture of the shelf-delta sequence it is inferred that deposition occurred during a time of high sediment supply and overall sea-level lowering. During this time the delta slopes failed several times, creating at least 30 internally coherent Mass Transport Deposits (MTDs) mainly grouped in common areas, affecting the same clinoform set and partially sharing the basal shear surface (groups of MTDs). The most important features of the studied MTDs are 1) the dominance of brittle deformation; 2) the small amount of material removal from the headwall domain (lack of completely depleted areas above the basal shear surface); and 3) the lack of an emergent toe domain above the un-failed sediment located basinward, although proper confining geometries for the MTD are not detected. Therefore, the studied MTDs can neither be classified as frontally confined nor as frontally emergent but they are a new intermediate type of submarine landslides which has not been described before. These characteristics suggest that the mass movement ceased relatively soon after initiation of failure. Incisions on top of the MTDs suggest the presence of erosive flows. These flows were probably generated due to a concentration of the drainage in the negative morphology the failure event left behind in the upper sector of the slope. The stronger progradational character of the reflections on top of MTDs confirms a concentration of drainage after the erosional phase too.The interplay between high sediment supply and constant or even decreasing accommodation space (caused by constant or decreasing sea-level) is supposed to be the main precondition for slope instability for most of the MTDs in this study area. Slope failures themselves can also be considered a preconditioning factor by the creation of local very high sedimentation rates (see groups of MTDs). Salt-induced seismicity and storm waves' effect superimposed on high frequency sea level fall are considered the most important triggering factors.
    Print ISSN: 0016-7746
    Electronic ISSN: 1573-9708
    Topics: Geosciences
    Published by Cambridge University Press
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  • 3
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    Quaternary sediment geochemistry as a proxy for toxic element source: A case study of arsenic in the Pecora Valley (southern Tuscany, Italy) (2010)
    Elsevier
    Details
    Publication Date: 2010-02-01
    Print ISSN: 0009-2541
    Electronic ISSN: 1872-6836
    Topics: Chemistry and Pharmacology , Geosciences
    Published by Elsevier
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  • 4
    Electronic Resource
    Electronic Resource
    Mine waste dumps and heavy metal pollution in abandoned mining district of Boccheggiano (Southern Tuscany, Italy) (1997)
    Springer
    Environmental geology 30 (1997), S. 238-243 
    Details
    ISSN: 1432-0495
    Keywords: Key words Mine waste dumps ; Heavy metal pollution ; Italy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract  Mining activity in the Boccheggiano-Fontalcinaldo area (Southern Tuscany) dates back at least to the 16th century AD and lasted up to very recent times. Copper-rich hydrothermal veins, massive pyrite deposits, and their gossans were exploited. Two mine waste dumps (Fontalcinaldo, Fontebona), one flotation tailings impoundment (Gabellino), and one roasting/smelting waste dump (Merse-Ribudelli) in the study area were selected to ascertain the environmental effects of such protracted mining activity. Primary waste mineralogy is mainly characterized by pyrite, gypsum, quartz, carbonates, chlorites, and micas. Secondary oxidation mineralogy includes Fe and Cu sulfates and hydroxy sulfates, Cu carbonates, Fe and Al oxyhydroxides, and other phases [neogenic cassiterite at Fontalcinaldo; probable calkinsite, (Ce,La)2(CO3)3· 4H2O, at Fontebona]. Mine waste samples show extremely variable contents of toxic elements (Cu, Pb, Zn, Bi, Cd, As), with average values in the order of hundreds to thousands of parts per million (except for Bi and Cd). In some samples, the abundance of proper minerals of these metals cannot account for the entire metal load. Conceivably, either solid solution substitutions or adsorption processes contribute to the intake of released metals into newly formed minerals. Release and transport of pollutants was affected to variable degrees by acid-neutralization processes. The highest metal and acid concentrations occur close to the investigated wastes and rapidly decrease moving downstream some hundreds of meters or less, with the partial exception for Mn and Fe. Other than dilution effects, this phenomenon may be ascribed to metal adsorption and precipitation of solid phases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002540050152
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  • 5
    Electronic Resource
    Electronic Resource
    Pigeon homing: Effects of manipulation of sensory experience at home site (1974)
    Springer
    Journal of comparative physiology 94 (1974), S. 85-96 
    Details
    ISSN: 1432-1351
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary During a treatment that lasted approximately 100 days beginning at fledging time, four groups of pigeons were kept for ten 3-day periods in an aviary of wire-netting located in Arnino. Here they could acquire a visual experience of the landmarks and leave for exercise flights. During these 3-day sojourns, the birds wore masks which prevented or limited their breathing through the nostrils. For the remaining time the pigeons were unmasked and closed in four cages outdoors that prevented them from seeing the country-side. The cages were of two types, ones with walls of horizontal strips that allowed the flow of air (pervious cages) and ones with vertical walls impervious to air currents (impervious cages). The four groups were kept under different conditions: 1) RP-birds were kept in a pervious cage in Arnino; 2) RI-birds, in an impervious cage in Arnino; 3) CP-birds, in a pervious cage in Miemo, 42 km SW of Arnino; 4) CI-birds, in an impervious cage in Miemo. The results of the test releases, carried out in a location 24.5 km SW of Arnino and 17.8 km NE of Miemo were the following: 1) The RP-birds were home oriented, all returning to Arnino; 2) the RI-birds were erroneously oriented towards SW, 20 out of 24 returning to Arnino but more slowly than the RP-birds with 4 lost; 3) the CP-birds were oriented towards the site of the cage (Miemo), 4 returning to Arnino, 5 to Miemo with 8 lost; 4) the CI-birds are oriented at random, 5 returning to Arnino with 8 lost. The results indicate that the initial orientation is correct only in pigeons which have been exposed to winds with their nostrils free. They can return to their cage even if they have no visual experience of the surroundings. However, return to a location where the pigeons had visual experience but no olfactory experience is also possible.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00617836
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  • 6
    Electronic Resource
    Electronic Resource
    Olfactory navigation of pigeons: The effect of treatment with odorous air currents (1974)
    Springer
    Journal of comparative physiology 94 (1974), S. 187-193 
    Details
    ISSN: 1432-1351
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary From fledging time, two groups of homing pigeons were protected for most of the time from wind exposure. Instead, they were subjected to artificial odorous winds. One of the two groups was subjected to an odorous wind of olive oil from the S and an odorous wind of a solvents' mixture (“synthetic turpentine”) from the N. The other group underwent the opposite treatment (odorous wind of olive oil from the N and odorous wind of synthetic turpentine from the S). The birds of the first group, released from two points 21.0 and 26.5 km W of the aviary flew in a northerly direction when olive oil was applied to their nostrils and in a southerly direction when synthetic turpentine was applied. Under the same conditions, the birds of the second group flew in the opposite directions. These results support the olfaction hypothesis of pigeon navigation (Papiet al., 1972).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00611866
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  • 7
    Electronic Resource
    Electronic Resource
    Pigeon navigation: Effects of wind deflection at home cage on homing behaviour (1975)
    Springer
    Journal of comparative physiology 99 (1975), S. 177-186 
    Details
    ISSN: 1432-1351
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary From fledging time up to the test releases, two groups of experimental pigeons were housed in two cubic cages supplied with deflectors which deviated the winds through to the inside approximately 70° clockwise (CW-birds) or counter-clockwise (CCW-birds). Test releases were made at 9.0, 23.5, and 105.3 km from the loft. With respect to that of control birds, the mean bearing of CW-birds was always deflected clockwise, and that of CCW-birds was always deflected counter-clockwise. Control birds performed better than CW-birds in homing from the first release site, and better than both experimental groups from the second release site. These results agree with the olfactory hypothesis of pigeon navigation (Papiet al., 1972).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00613834
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  • 8
    Electronic Resource
    Electronic Resource
    An experiment for testing the hypothesis of olfactory navigation of homing pigeons (1973)
    Springer
    Journal of comparative physiology 83 (1973), S. 93-102 
    Details
    ISSN: 1432-1351
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Beginning from fledging time up to the time of homing experiments, 33 experimental pigeons were kept alternatively for three days in a wire-netting aviary which they could leave for spontaneous flights (O-aviary), and for three days in a closed aviary fenced with plastic sheeting (C-aviary). In the O-aviary they wore masks which prevented or limited their breathing through the nostrils. As controls, 31 birds were kept for three days in the O-aviary without masks and for three days in the C-aviary wearing masks. In eight releases from places situated between 10 and 61 km from the aviary, the experimental birds gave worse homing performances than the control birds. Besides, contrary to the control birds, the initial orientation is mostly either wrong or at random in the experimental ones. These results support the hypothesis of olfactory navigation (Papiet al., 1972), which supposes that the pigeons, during their first months of life, gather information on smells prevailing in surrounding regions through the winds.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00694576
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  • 9
    Electronic Resource
    Electronic Resource
    Adhesion, growth, and matrix production by osteoblasts on collagen substrata (1992)
    Springer
    Calcified tissue international 51 (1992), S. 202-212 
    Details
    ISSN: 1432-0827
    Keywords: Osteoblasts ; Collagen type I ; “On gel” cultures ; Collagen sponges ; Osteocalcin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Notes: Summary A number of studies have demonstrated the pivotal role of collagen molecules in modulating cell growth and differentiation. In order to analyze the direct effects of collagen type I on the osteoblastic phenotype, we have devised an in vitro culture system for studying the interactions between bovine collagen type I and Saos-2 cells, a human osteoblastic cell line. Saos-2 cells were cultured both on top of collagen-coated culture dishes as well as inside a three-dimensional collagen network. Plating on dishes treated with collagen induced maximal adhesion of Saos-2 cells after 24-hour incubation. Cells cultured on collagen gel matrix expressed about 2.5-fold more alkaline phosphatase when compared with untreated plastic dishes. On collagen-coated dishes the responsiveness of Saos-2 cells to parathyroid hormone was decreased, whereas no modifications were observed in the effect of vasoactive intestinal peptide on these cells. Using a microfluorimetric measurement of DNA, an increase of proliferation was observed in Saos-2 cells cultured on collagen gel Saos-2 cells were also able to colonize collagen sponges and in this three-dimensional network they were able to synthesize osteocalcin, as assessed both by immunocytochemistry and radioimmunoassay. In this study we have demonstrated that bovine collagen type I exhibits favorable effects on attachment and functional and growth activities of a human osteoblastic cell line, encouraging its use as a bone graft material.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00334548
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  • 10
    Electronic Resource
    Electronic Resource
    Bioavailability of a new effervescent tablet of ibuprofen in healthy volunteers (1997)
    Springer
    European journal of clinical pharmacology 52 (1997), S. 505-506 
    Details
    ISSN: 1432-1041
    Keywords: Key words Ibuprofen; effervescent tablets ; kinetics ; bioavailability
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002280050327
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