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  • 1
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    Branched tetraether lipids from the Tagus River basin to the coastal ocean of the Portuguese margin
    PANGAEA
    In:  Supplement to: Zell, Claudia; Kim, Jung-Hyun; Balsinha, M; Dorhout, Denise J C; Fernandes, C; Baas, Marianne; Sinninghe Damsté, Jaap S (2014): Transport of branched tetraether lipids from the Tagus River basin to the coastal ocean of the Portuguese margin: consequences for the interpretation of the MBT'/CBT paleothermometer. Biogeosciences, 11(19), 5637-5655, https://doi.org/10.5194/bg-11-5637-2014
    Details
    Publication Date: 2023-05-12
    Description: Branched glycerol dialkyl glycerol tetraethers (brGDGTs), which are thought to be transported from soil to marine sediment by rivers, have been used to reconstruct the mean annual air temperature (MAAT) and soil pH of the drainage basin using the methylation index of branched tetraethers (MBT, recently refined as MBT') and cyclization index of branched tetraethers (CBT) from coastal marine sediment records. In this study we are tracing the brGDGTs from source to sink in the Tagus River basin, the longest river system on the Iberian Peninsula, by determining their concentration and distribution in soils, river suspended particulate matter (SPM), riverbank sediments, marine SPM, and marine surface sediments. The concentrations of brGDGTs in river SPM were substantially higher and their distributions were different compared to those of the drainage basin soils. This indicates that brGDGTs are mainly produced in the river itself. In the marine environment, the brGDGT concentrations rapidly decreased with increasing distance from the Tagus estuary. At the same time, the brGDGT distributions in marine sediments also changed, indicating that marine in-situ production also takes place. These results show that there are various problems that complicate the use of the MBT'/CBT for paleoreconstructions using coastal marine sediments in the vicinity of a river. However, if the majority of brGDGTs are produced in the river, it might be possible to reconstruct the environmental (temperature and pH) conditions of the river water using appropriate aquatic calibrations, provided that marine core locations are chosen in such a way that the brGDGTs in their sediments are predominantly derived from riverine in-situ production.
    Keywords: NIOZ_UU; NIOZ Royal Netherlands Institute for Sea Research, and Utrecht University
    Type: Dataset
    Format: application/zip, 3 datasets
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 2
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    (Table 3) Bulk organic geochemical data of marine surface sediments collected in the Tagus River basin
    PANGAEA
    Details
    Publication Date: 2023-05-12
    Keywords: 64PE332; 64PE332-27_3; 64PE332-28_1; 64PE332-29_2; 64PE332-31_2; 64PE332-33_1; 64PE332-36_3; Carbon, organic, total; DEPTH, sediment/rock; Elevation of event; Event label; Latitude of event; Longitude of event; MUC; MultiCorer; NIOZ_UU; NIOZ Royal Netherlands Institute for Sea Research, and Utrecht University; Pacemaker; Pelagia; Portuguese Margin; Station label; δ13C, organic carbon
    Type: Dataset
    Format: text/tab-separated-values, 18 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 3
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    (Table 2) Bulk organic geochemical data of SPM collected in the Tagus River basin
    PANGAEA
    Details
    Publication Date: 2023-05-12
    Keywords: 64PE332; 64PE332-27_1; 64PE332-28_3; 64PE332-32_1; 64PE332-36_4; Carbon, organic, total; CTD/Rosette; CTD-RO; DEPTH, water; Event label; Latitude of event; Longitude of event; NIOZ_UU; NIOZ Royal Netherlands Institute for Sea Research, and Utrecht University; Pacemaker; Pelagia; pH; Portuguese Margin; Sample code/label; Station label; Suspended particulate matter; Tagus pro-delta, Portuguese margin; TR_10#1_Sup; TR_11#1_Sup; TR_12#1_Sup; TR_2_Sup; TR_3#1_Sup; TR_4#1_Sup; TR_5#1_Sup; TR_6#1_Sup; TR_7#1_Sup; TR_8#1_Sup; TR_9#1_Sup; Water sample; WS; δ13C, organic carbon
    Type: Dataset
    Format: text/tab-separated-values, 146 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 4
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    (Table 1) Environmental and bulk geochemical data of soils and riverbank sediments collected in the Tagus River basin
    PANGAEA
    Details
    Publication Date: 2023-05-12
    Keywords: Carbon, organic, total; Date/Time of event; DEPTH, sediment/rock; DEPTH, soil; Elevation of event; Event label; Latitude of event; Longitude of event; NIOZ_UU; NIOZ Royal Netherlands Institute for Sea Research, and Utrecht University; pH; Portugal; Precipitation, annual mean; Sediment sample; SES; SOIL; Soil profile; Tagus_RB_1; Tagus_RB_11; Tagus_RB_13; Tagus_RB_17; Tagus_RB_21; Tagus_RB_3; Tagus_RB_7; Tagus_RB_9; Tagus_Soil_10; Tagus_Soil_12; Tagus_Soil_13; Tagus_Soil_14; Tagus_Soil_15; Tagus_Soil_16; Tagus_Soil_17; Tagus_Soil_18; Tagus_Soil_19; Tagus_Soil_2; Tagus_Soil_20; Tagus_Soil_3; Tagus_Soil_4; Tagus_Soil_5; Tagus_Soil_6; Tagus_Soil_8; Tagus pro-delta, Portuguese margin; Temperature, air, annual mean; δ13C, organic carbon
    Type: Dataset
    Format: text/tab-separated-values, 130 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 5
    Electronic Resource
    Electronic Resource
    Papulonecrotic tuberculid in a human immunodeficiency virus type-1 patient with multidrug-resistant tuberculosis (2004)
    Oxford, UK : Blackwell Science Ltd
    Journal of the European Academy of Dermatology and Venereology 18 (2004), S. 0 
    Details
    ISSN: 1468-3083
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1468-3083.2004.00842.x
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    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Weather-based prediction of anthracnose severity using artificial neural network models (2004)
    Oxford, UK : Blackwell Science Ltd
    Plant pathology 53 (2004), S. 0 
    Details
    ISSN: 1365-3059
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Data were collected and analysed from seven field sites in Australia, Brazil and Colombia on weather conditions and the severity of anthracnose disease of the tropical pasture legume Stylosanthes scabra caused by Colletotrichum gloeosporioides. Disease severity and weather data were analysed using artificial neural network (ANN) models developed using data from some or all field sites in Australia and/or South America to predict severity at other sites. Three series of models were developed using different weather summaries. Of these, ANN models with weather for the day of disease assessment and the previous 24 h period had the highest prediction success, and models trained on data from all sites within one continent correctly predicted disease severity in the other continent on more than 75% of days; the overall prediction error was 21·9% for the Australian and 22·1% for the South American model. Of the six cross-continent ANN models trained on pooled data for five sites from two continents to predict severity for the remaining sixth site, the model developed without data from Planaltina in Brazil was the most accurate, with 〉85% prediction success, and the model without Carimagua in Colombia was the least accurate, with only 54% success. In common with multiple regression models, moisture-related variables such as rain, leaf surface wetness and variables that influence moisture availability such as radiation and wind on the day of disease severity assessment or the day before assessment were the most important weather variables in all ANN models. A set of weights from the ANN models was used to calculate the overall risk of anthracnose for the various sites. Sites with high and low anthracnose risk are present in both continents, and weather conditions at centres of diversity in Brazil and Colombia do not appear to be more conducive than conditions in Australia to serious anthracnose development.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3059.2004.01044.x
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    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Lateral migration of fishes in Amazon floodplains (1997)
    Oxford, UK : Blackwell Publishing Ltd
    Ecology of freshwater fish 6 (1997), S. 0 
    Details
    ISSN: 1600-0633
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract— Migrations of fish in the outlet channel of Lago do Rei, a floodplain lake on Careiro Island in the Amazon River, were examined using three capture methods. Of the 85 species found in the Parana do Rei (channel), 20 migrated between the lake and river. Migrations from the lake to the river occurred in two pulses. In August-September, as the river water level began to recede, some fish migrated to the river with the current. As the river water level rose in December-January, additional fish migrated towards the main river against the current. Fish returned to the lake by March or April after they had spawned. The migratory patterns of six species, family Curimatidae and Prochilodontidae: Potamorhina latior, Psectrogaster amazonica, P. rutiloides, Curimata kneri, Prochilodus nigricans and Semaprochilodus taeniurus are described in detail. Lateral migrations of fish in this ecosystem appear to be closely linked to breeding and to physical habitat changes related to river water level.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1600-0633.1997.tb00140.x
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    Paper (German National Licenses)
    Fulltext
  • 8
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    Reduction of Toxoplasma gondii Development Due to Inhibition of Parasite Antioxidant Enzymes by a Dinuclear Iron(III) Compound [Biologic Response Modifiers] (2015)
    The American Society for Microbiology (ASM)
    Details
    Publication Date: 2015-11-18
    Description: Toxoplasma gondii , the causative agent of toxoplasmosis, is an obligate intracellular protozoan that can infect a wide range of vertebrate cells. Here, we describe the cytotoxic effects of the dinuclear iron compound [Fe(HPCINOL)(SO 4 )] 2 -μ-oxo, in which HPCINOL is the ligand 1-(bis-pyridin-2-ylmethyl-amino)-3-chloropropan-2-ol, on T. gondii infecting LLC-MK2 host cells. This compound was not toxic to LLC-MK2 cells at concentrations of up to 200 μM but was very active against the parasite, with a 50% inhibitory concentration (IC 50 ) of 3.6 μM after 48 h of treatment. Cyst formation was observed after treatment, as indicated by the appearance of a cyst wall, Dolichos biflorus lectin staining, and scanning and transmission electron microscopy characteristics. Ultrastructural changes were also seen in T. gondii , including membrane blebs and clefts in the cytoplasm, with inclusions similar to amylopectin granules, which are typically found in bradyzoites. An analysis of the cell death pathways in the parasite revealed that the compound caused a combination of apoptosis and autophagy. Fluorescence assays demonstrated that the redox environment in the LLC-MK2 cells becomes oxidant in the presence of the iron compound. Furthermore, a reduction in superoxide dismutase and catalase activities in the treated parasites and the presence of reactive oxygen species within the parasitophorous vacuoles were observed, indicating an impaired protozoan response against these radicals. These findings suggest that this compound disturbs the redox equilibrium of T. gondii , inducing cystogenesis and parasite death.
    Print ISSN: 0066-4804
    Electronic ISSN: 1098-6596
    Topics: Biology , Medicine
    Published by The American Society for Microbiology (ASM)
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    PAPER CURRENT
  • 9
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    Foxa genes regulate dopamine levels and feeding [Neuroscience] (2015)
    National Academy of Sciences
    Details
    Publication Date: 2015-09-02
    Description: Midbrain dopaminergic (mDA) neurons are implicated in cognitive functions, neuropsychiatric disorders, and pathological conditions; hence understanding genes regulating their homeostasis has medical relevance. Transcription factors FOXA1 and FOXA2 (FOXA1/2) are key determinants of mDA neuronal identity during development, but their roles in adult mDA neurons are unknown. We used a...
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
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    PAPER CURRENT
  • 10
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    CLOCKS: Northern Cascadia: Extent of locked zone, prism deformation, slip-to-toe, and the edge of subduction, and CASCADIA CO2: Seismic multi-parameter study at a possible site for CO2 storage in basalt in the Cascadia Basin utilizing shear wave events (secondary user), Cruise No. SO294, 13.09. 2022 - 27.10. 2022, Vancouver (Canada) - Port Hueneme (USA), ReSEAt (2023)
    Details
    Publication Date: 2023-11-06
    Description: The research cruise M187 with the RV METEOR sailed January 25 th to March 4 th 2023 from Walvis Bay to Walvis Bay (Namibia), with a focus on investigating the biogeochemical gradients that exist between the Benguela Upwelling zone and the South Atlantic Subtropical Gyre. In order to achieve this, the two specific foci of the research cruise were to (i) track upwelling filaments as they advect offshore and interact with the subtropical gyre, and (ii) perform a high-resolution transect from upwelling sites to the subtropical gyre. On the research cruise, two filaments were successfully mapped from cold water upwelling sites near or over the Namibian shelf through to warmer waters offshore. This was followed by a transect of twelve stations outwards into the subtropical gyre, reaching a maximum westward position of 5 °W. Sampling stations were conducted to a maximum depth of 1000 m and involved an array of deployments to investigate the biogeochemistry of the water column. Further nutrient addition bioassay experiments were conducted throughout the research cruise to assess the nutrients (co-)limiting to phytoplankton growth. Collectively our research will shed light on key mechanisms establishing the major oceanic biogeochemical gradients between upwelling and subtropical gyre regions, so that they can be included in models used to predict the impacts of climate change.
    Type: Report , NonPeerReviewed
    Format: text
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    OceanRep: Report - Cruise Report
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