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  • 1
    Electronic Resource
    Electronic Resource
    Lipolytic activity of marine bacteria. Influence of NaCl and MgCl2 (1982)
    Springer
    Marine biology 67 (1982), S. 113-119 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Esterase and lipase activity of several marine bacteria was demonstrated using various substrates. NaCl at low molarity slightly increases this activity by changing membrane permeability in living cells. The salt influence is less pronounced with cell-free extracts. Conversely, MgCl2 enhances lipolysis by removing the resulting fatty acids: in this case living cells and cell-free extracts show practically the same activity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00401276
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Picoplankton BIOMASS in the Ross Sea (Antarctica) (1993)
    Springer
    Polar biology 13 (1993), S. 1-6 
    Details
    ISSN: 1432-2056
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Spatial distribution of picoplankton in the Ross Sea was studied. The authors discuss the biomasses of various picoplanktonic-sized fractions and of bacterial cells between 0.2 and 2.0 μm capable of growing on Marine Agar 2216 (Difco). Picoplankton having a cellular diameter cf between 1.0 and 2.0 μm (PP1) generally predominate, accounting for 73% of the whole picoplankton biomass. However, smaller cells (PP2) can represent 28% of the picoplankton biomass at depths corresponding to 1% of surface light. These results are in good agreement with those found in the coastal regions of McMurdo Sound (Fuhrman and Azam 1980) and in other areas of the Antarctic seas where total bacterioplankton was studied (Hanson et al. 1983b; El-Sayed 1987; Lancelot et al. 1989). Biomasses of total picoplankton (TPP) are not correlated with any of the environmental parameters studied. The PP1 is correlated with O2 and silicates and PP2 is correlated with O2, phosphates temperature and nitrates. Aerobic heterotrophic biomasses are correlated with O2 and salinity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00236577
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  • 3
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    High-resolution analysis of daily precipitation trends in the central Alps over the last century (2011)
    Wiley
    Details
    Publication Date: 2011-06-15
    Description: In this work we present a homogenized high-resolution data set composed of 200 daily precipitation series spanning the last 90 years, located over an area centred on the Trentino—South Tyrol region (central part of the European Alps), in a transition zone between the climates of the southern and northern slopes of the Alps. We analysed the trends of total precipitation (TP), wet days (WD) and average intensity (PI), as well as trends of the number of events and precipitation amounts belonging to 12 different daily intensity categories. For an easier understanding of geographical patterns, we set up a gridded data set in terms of anomalies, with a spatial resolution of 0.1°. All the statistics were analysed for trend over the entire period spanned by the data and on subperiods of variable length. On regional average, we found a weak decrease in TP (about 1%/decade with respect to the 1971–2000 mean) over the entire studied period (1922–2009), which was statistically significant only in spring. Gridded data show that the decrease is related to a reduction in the number of WD in the eastern part of the study area, and a decrement in PI in the western part, with orography playing a clear role in this differentiation. On a daily scale, trends of the strongest events present scarce spatial coherence and are only locally significant, however the results are highly dependent on the period analysed. Comparisons with previous low-resolution studies on the same area underline the importance of a high-resolution data set in characterizing spatial variability of climatic trends in precipitation. Copyright © 2011 Royal Meteorological Society
    Print ISSN: 0899-8418
    Electronic ISSN: 1097-0088
    Topics: Geosciences , Physics
    Published by Wiley
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  • 4
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    High-resolution temperature climatology for Italy: interpolation method intercomparison (2013)
    Wiley
    Details
    Publication Date: 2013-07-24
    Description: ABSTRACT High-resolution monthly temperature climatologies for Italy are presented. They are based on a dense and quality-controlled observational dataset which includes 1484 stations and on three distinct approaches: multi-linear regression with local improvements (MLRLI), an enhanced version of the model recently used for the Greater Alpine Region, regression kriging (RK), widely used in literature and, lastly, local weighted linear regression (LWLR) of temperature versus elevation, which may be considered more suitable for the complex orography characterizing the Italian territory. Dataset and methods used both to check the station records and to get the 1961–1990 normals used for the climatologies are discussed. Advantages and shortcomings of the three approaches are investigated and the results are compared. All three approaches lead to quite reasonable models of station temperature normals, with lowest errors in spring and autumn and highest errors in winter. The LWLR approach shows slightly better performances than the other two, with monthly leave-one-out estimated root mean square errors ranging from 0.74 °C (April and May) to 1.03 °C (December). Further evidence in its favour is the greater reliability of local approach in modelling the behaviour of the temperature-elevation relationship in Italy's complex territory. The comparison of the different climatologies is a very effective tool to understand the robustness of each approach. Moreover, the first two methods (MLRLI and RK) turn out to be important to tune the third one (LWLR), as they help not only to understand the relationship between temperature normals and some important physiographical variables (MLRLI) but also to study the decrease of station normals covariance with distance (RK).
    Print ISSN: 0899-8418
    Electronic ISSN: 1097-0088
    Topics: Geosciences , Physics
    Published by Wiley
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  • 5
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    Microbiological characterization of a semi-enclosed sub-Antarctic environment: the Straits of Magellan (2010)
    Springer
    Details
    Publication Date: 2010-06-03
    Print ISSN: 0722-4060
    Electronic ISSN: 1432-2056
    Topics: Biology
    Published by Springer
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  • 6
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    Lipolytic activity of marine bacteria. Influence of NaCl and MgCl2 (1982)
    Springer
    Details
    Publication Date: 1982-04-01
    Print ISSN: 0025-3162
    Electronic ISSN: 1432-1793
    Topics: Biology
    Published by Springer
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  • 7
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    Estimation of picoplankton (1991)
    Institut für Meereskunde
    Details
    Publication Date: 2022-06-08
    Description: The method proposed for the measurement of the picoplankton density, uses epifluorescence microscopy, which allows the detection of all the cells with their own or/and induced fluorescence. Direct counts may lead to an overestimation of the viable counts since we cannot discriminate between living and dead cells. We appropriately modified the method of KOGURE et al. (1979) for the fraction of cells capable of division. This method is applied both to autofluorescent organisms and to all the cells stained by fluorochrome (DAPI). Direct counts are compared with those obtained from Marine Agar, a selective medium for marine heterotrophic bacteria. The results obtained in different Mediterranean areas allow us to realize how effective this method is in comparatively evaluating different planktonic dimensional fractions occurring in the marine ecosystem.
    Type: Article , NonPeerReviewed
    Format: text
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  • 8
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    Bacterial and archaeal populations at two shallow hydrothermal vents off Panarea Island (Eolian Islands, Italy) (2009)
    Springer
    Details
    Publication Date: 2021-07-13
    Description: The aim of this study was to investigate the microbial community thriving at two shallow hydrothermal vents off Panarea Island (Italy). Physico-chemical characteristics of thermal waters were examined in order to establish the effect of the vents on biodiversity of both Bacteria and Archaea. Water and adjacent sediment samples were collected at different times from two vents, characterised by different depth and temperature, and analysed to evaluate total microbial abundances, sulphuroxidising and thermophilic aerobic bacteria. Total microbial abundances were on average of the order of 105 cells ml-1, expressed as picoplanktonic size fraction. Picophytoplanktonic cells accounted for 0.77–3.83% of the total picoplanktonic cells. The contribution of bacterial and archaeal taxa to prokaryotic community diversity was investigated by PCR–DGGE fingerprinting method. The number of bands derived from bacterial DNA was highest in the DGGE profiles of water sample from the warmest and deepest site (site 2). In contrast, archaeal richness was highest in the water of the coldest and shallowest site (site 1). Sulphur-oxidising bacteria were detected by both culture- dependent and -independent methods. The primary production at the shallow hydrothermal system of Panarea is supported by a complex microbial community composed by phototrophs and chemolithotrophs.
    Description: Published
    Description: 199-212
    Description: 1.2. TTC - Sorveglianza geochimica delle aree vulcaniche attive
    Description: JCR Journal
    Description: reserved
    Keywords: hydrothermal vents ; bacteria ; geochemistry ; fluids ; 03. Hydrosphere::03.03. Physical::03.03.01. Air/water/earth interactions
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 9
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    Changes in prokaryotic community composition accompanying a pronounced temperature shift of a shallow marine thermal brine pool (Panarea Island, Italy) (2015)
    Springer Verlag Tokyo
    Details
    Publication Date: 2021-07-13
    Description: Hot Lake is a recently described thermal brine pool off Panarea Island (Eolian Islands, Italy) where emitted fluids are highly saline and rich in CO2 and H2S. The prokaryotic community composition in surface sediment samples was analyzed by high-throughput Illumina sequencing targeting the V3 region of the 16S rRNA at two time points that differed mainly with respect to temperature conditions, high-temperature (94 °C, HT09) and low-temperature (28.5 °C, LT10). Bacterial richness and diversity were greater than those of Archaea under both temperature conditions. In contrast to Bacteria, diversity and evenness of Archaea greatly increased at LT10. While the phylogenetic analysis indicated the presence of members mostly affiliated with the same taxonomic groups, their relative abundances differed from HT09 to LT10, resulting in different bacterial and archaeal assemblages. Both HT09 and LT10 were dominated by members of the Epsilonproteobacteria. Within this subphylum, bacteria of the genus Sulfurimonas were most frequently detected at HT09, while Arcobacter prevailed at LT10. The abundance of other dominant taxonomic groups (≥1 % of Illumina reads) also correlated with temperature conditions. Members assigned to hyperthermophilic Euryarchaeota (Thermococci) or to thermophilic (Caldiserica) and thermoresistant (Firmicutes) bacterial taxa were dominant at HT09, while those related to non-thermophilic Bacteroidetes, Fusobacteria and Actinobacteria were dominant at LT10. Several, probably photosynthetic, members of the Alphaproteobacteria, Chlorobi, Cyanobacteria and Chloroflexi were recovered under both temperature conditions. The co-occurrence of photosynthetic and chemolithotrophic microorganisms represents a unique feature of shallow vents such as Hot Lake
    Description: Published
    Description: 547-559
    Description: 3A. Ambiente Marino
    Description: JCR Journal
    Description: restricted
    Keywords: Microbial diversity ; Shallow Idrthermal systems ; 03. Hydrosphere::03.04. Chemical and biological::03.04.06. Hydrothermal systems
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 10
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    The submarine hydrothermal system of Panarea (Southern Italy): biogeochemical processes at the thermal fluids - sea bottom interface (2006)
    Details
    Publication Date: 2019-11-04
    Description: Among the submarine hydrothermal systems located offshore the volcanic archipelago of the Aeolian Islands (Southern Italy), the most active is located off the coasts of Panarea island. Thermal waters, gases and sulfur deposits coexist at the sea bottom where hydrothermal fluids are released from both shallow and deep vents. The chemical and isotopic composition of the fluid phase shows the presence of a significant magmatic component and the physico-chemical conditions of the geothermal reservoir allow the release of reduced chemical species that are microbially mediated towards the production of organic carbon as a form of biochemical energy. Microorganisms inhabiting this environment possess nutritional requirements and overall metabolic pathways ideally suited to such ecosystem that represents a clear example of the close connection between geosphere and biosphere. Microscopic examination of the white mat attached to rock surfaces showed the presence of Thiothrix-like filamentous bacteria. Moderately thermophilic heterotrophic isolates were identified as strains of the genus Bacillus. Although the hydrothermal system of Panarea has to be considered a “shallow” system, it shows many characteristics that make it similar to the “deep” oceanic systems, giving a unique opportunity for improving our knowledge on such an unexplored world by working at this easily accessible site.
    Description: JCR Journal
    Description: open
    Keywords: Submarine hydrothermal activity ; fluids geochemistry ; sulfur deposits ; microbial communities ; 03. Hydrosphere::03.04. Chemical and biological::03.04.06. Hydrothermal systems
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
    Format: 3563600 bytes
    Format: application/pdf
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