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  • 1
    facet.materialart.
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    Volcano-hydrothermal system and activity of Sirung volcano (Pantar Island, Indonesia) (2019)
    Details
    Publication Date: 2020-11-26
    Description: Sirung is a frequently active volcano located in the remote parts of Western Timor (Indonesia). Sirung has a crater with several hydrothermal features including a crater lake. We present a timeseries of satellite images of the lake and chemical and isotope data from the hyperacid hydrothermal system. The fluids sampled in the crater present the typical features of hyperacidic systems with high TDS, low pH and d34SHSO4 –d34SS0 among the highest for such lakes. The cations concentrations are predominantly controlled by the precipitation of alunite, jarosite, silica phases, native sulfur and pyrite which dominate the shallow portions of the hydrothermal system. These minerals may control shallow sealing processes thought to trigger phreatic eruptions elsewhere. Sparse Mg/Cl and SO4/Cl ratios and lake parameters derived from satellite images suggest gradual increase in heat and gas flux, most likely SO2-rich, prior to the 2012 phreatic eruption. An acidic river was sampled 8 km far from the crater and is genetically linked with the fluids rising toward the active crater. This river would therefore be a relevant target for future remote monitoring purposes. Finally, several wells and springs largely exceeded the World Health Organization toxicity limits in total arsenic and fluoride.
    Description: Published
    Description: 186-199
    Description: 4V. Processi pre-eruttivi
    Description: JCR Journal
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 2
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    Stratification at the Earth's largest hyperacidic lake and its consequences (2018)
    Details
    Publication Date: 2020-11-26
    Description: Volcanic lakes provide windows into the interior of volcanoes as they integrate the heat flux discharged by a magma body and condense volcanic gases. Volcanic lake temperatures and geochemical compositions therefore typically serve as warnings for resumed unrest or prior to eruptions. If acidic and hot, these lakes are usually considered to be too convective to allow any stratification within their waters. Kawah Ijen volcano, featuring the largest hyperacidic lake on Earth (volume of 27 millionm3), is less homogeneous than previously thought. Hourly temperature measurements reveal the development of a stagnant layer of cold waters (〈30◦C), overlying warmer and denser water (generally above 30◦C and density ∼1.083 kg/m3). Examination of 20yrs of historical records and temporary measurements show a systematic thermal stratification during rainy seasons. The yearly rupture of stratification at the end of the rainy season causes a sudden release of dissolved gases below the cold water layer which appears to generate a lake overturn, i.e. limnic eruption, and a resonance of the lake, i.e. a seiche, highlighting a new hazard for these extreme reservoirs. A minor non-volcanic event, such as a heavy rainfall or an earthquake, may act as a trigger. The density driven overturn requires specific salinity-temperature conditions for the colder and less saline top water layer to sink into the hot saline water. Spectacular degassing occurs when the dissolved gases, progressively stored during the rainy season due to a weakened diffusion of carbon dioxide in the top layer, are suddenly released. These findings challenge the homogenization assumption at acidic lakes and stress the need to develop appropriate monitoring setups.
    Description: Published
    Description: 28-35
    Description: 4V. Dinamica dei processi pre-eruttivi
    Description: JCR Journal
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 3
    Electronic Resource
    Electronic Resource
    Monoclonal antibodies directed against the E2 protein (MIC2 gene product) induce exposure of phosphatidylserine at the thymocyte cell surface (1993)
    s.l. : American Chemical Society
    Biochemistry 32 (1993), S. 10096-10101 
    Details
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/bi00089a027
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  • 4
    Electronic Resource
    Electronic Resource
    Integration of CAD and rapid manufacturing for sand casting optimisation (2003)
    Bingley : Emerald
    Rapid prototyping journal 9 (2003), S. 327-333 
    Details
    ISSN: 1355-2546
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In order to reduce the time and costs of the products development in the sand casting process, the SMC Colombier Fontaine company has carried out a study based on tooling manufacturing with a new rapid prototyping process. This evolution allowed the adequacy of the geometry used for the simulation to the tooling employed physically in the production. This allowed a reduction of the wall thickness to 4?mm and retained reliable manufacturing process.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/13552540310502220
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  • 5
    Electronic Resource
    Electronic Resource
    An original approach for the memorisation and the generation of rapid product development processes (2003)
    Bingley : Emerald
    Rapid prototyping journal 9 (2003), S. 58-67 
    Details
    ISSN: 1355-2546
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: This paper introduces a knowledge-based environment dedicated to the choice of rapid product development processes. Rapid product development processes are not limited to layer-manufacturing machines, but they also integrate CAD, reverse engineering, indirect methods for metallic and plastic part manufacturing, etc. The aim of the proposed knowledge-based environment is to propose, from a detailed functional specification, different alternatives of rapid product development processes, which can be ordered and optimised when considering a combination of different specification criteria (cost, quality, delay, aspect, material, etc.).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/13552540310467068
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  • 6
    Electronic Resource
    Electronic Resource
    Some ultrabornological normed function spaces (1997)
    Springer
    Archiv der Mathematik 69 (1997), S. 409-417 
    Details
    ISSN: 1420-8938
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract. A variety of normed function spaces, including the space E 0 (X) of continuous functions on the compact Hausdorff space X that are locally constant on a dense open subset of X, are shown to be ultrabornological.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s000130050139
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  • 7
    Electronic Resource
    Electronic Resource
    Geochemical and isotopic evidence for seawater contamination of the hydrothermal system of Taal Volcano, Luzon, the Philippines (1998)
    Springer
    Bulletin of volcanology 59 (1998), S. 562-576 
    Details
    ISSN: 1432-0819
    Keywords: Key words Hydrothermal system ; Fluid geochemistry ; Stable isotopes ; Geochemical monitoring ; Taal Volcano
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract  The hydrologic structure of Taal Volcano has favored development of an extensive hydrothermal system whose prominent feature is the acidic Main Crater Lake (pH〈3) lying in the center of an active vent complex, which is surrounded by a slightly alkaline caldera lake (Lake Taal). This peculiar situation makes Taal prone to frequent, and sometimes catastrophic, hydrovolcanic eruptions. Fumaroles, hot springs, and lake waters were sampled in 1991, 1992, and 1995 in order to develop a geochemical model for the hydrothermal system. The low-temperature fumarole compositions indicate strong interaction of magmatic vapors with the hydrothermal system under relatively oxidizing conditions. The thermal waters consist of highly, moderately, and weakly mineralized solutions, but none of them corresponds to either water–rock equilibrium or rock dissolution. The concentrated discharges have high Na contents (〉3500 mg/kg) and low SO4/Cl ratios (〈0.3). The Br/Cl ratio of most samples suggests incorporation of seawater into the hydrothermal system. Water and dissolved sulfate isotopic compositions reveal that the Main Crater Lake and spring discharges are derived from a deep parent fluid (T≈300  °C), which is a mixture of seawater, volcanic water, and Lake Taal water. The volcanic end member is probably produced in the magmatic-hydrothermal environment during absorption of high-temperature gases into groundwater. Boiling and mixing of the parent water give rise to the range of chemical and isotopic characteristics observed in the thermal discharges. Incursion of seawater from the coastal region to the central part of the volcano is supported by the low water levels of the lakes and by the fact that Lake Taal was directly connected to the China sea until the sixteenth century. The depth to the seawater-meteoric water interface is calculated to be 80 and 160 m for the Main Crater Lake and Lake Taal, respectively. Additional data are required to infer the hydrologic structure of Taal. Geochemical surveillance of the Main Crater Lake using the SO4/Cl, Na/K, or Mg/Cl ratio cannot be applied straightforwardly due to the presence of seawater in the hydrothermal system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004450050210
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  • 8
    Electronic Resource
    Electronic Resource
    The X-ray crystal structure of phosphomannose isomerase from Candida albicans at 1.7 Å resolution (1996)
    [s.l.] : Nature Publishing Group
    Nature structural biology 3 (1996), S. 470-479 
    Details
    ISSN: 1072-8368
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Medicine
    Notes: [Auszug] Phosphomannose isomerase (PMI) catalyses the reversible isomerization of fructose-6-phosphate (F6P) and mannose-6-phosphate (M6P). Absence of PMI activity in yeasts causes cell lysis and thus the enzyme is a potential target for inhibition and may be a route to antifungal drugs. The 1.7 ˚ ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nsb0596-470
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  • 9
    Electronic Resource
    Electronic Resource
    Suppressor effects and cyclic AMP accumulation by the CD29 molecule of CD4 + lymphocytes (1989)
    [s.l.] : Nature Publishing Group
    Nature 339 (1989), S. 152-154 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] We used eight anti-VLA monoclonal antibodies, all of which have a similar pattern of tissue distribution and react with thymocytes. Some are already well defined: K20 and 4B4-both of which were initially used to define CD29 (ref. 5)-and TS2/16 all recognize the common /3-subunit6, whereas HP2/1 ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/339152a0
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  • 10
    Electronic Resource
    Electronic Resource
    Intermolecular complexes between three human CD1 molecules on normal thymus cells (1988)
    Springer
    Immunogenetics 27 (1988), S. 187-195 
    Details
    ISSN: 1432-1211
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract The first cluster of differentiation (CD1) defines at least three distinct human thymic cell-surface differentiation antigens-CD1a, CD1b, and CD1c. We looked for structural homology of the three CD1 heavy chains at their peptide level by two-dimensional peptide maps. We show here that the CD1a M r 49 000 heavy chain and the CD1b M r 45 000 heavy chain appear to be more homologous to each other than to the CD1c M r 43 000 heavy chain and that only one tyrosil peptide is common to the three heavy chains. Study of the CD1 heavy chains from several individuals reveals a very limited polymorphism of these molecules. We also demonstrate here that CD1a or CD1a-like molecules and other CD1 molecules can form intermolecular complexes on the surface of normal thymus cells. Molecules that are structurally very similar to CD1a molecules are associated noncovalently either with CD1c molecules or with CD1b molecules, and only CD 1a molecules can associate covalently with CD8 molecules. In contrast, we could not find these intermolecular complexes on the surface of leukemic T-cell lines in culture.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00346585
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