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  • Articles  (14)
  • 550 - Earth sciences
  • Cyanobacteria
  • Semantic web technologies
  • American Association for the Advancement of Science (AAAS)  (9)
  • Berlin  (3)
  • Community Online Resource for Statistical Seismicity Analysis
  • Reston, Va. : US Geological Survey
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  • Articles  (14)
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  • 1
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    Cyanobacterial toxins in Lake Baringo, Kenya. (2015)
    Freie Universität Berlin | Berlin
    Details
    Publication Date: 2021-05-19
    Description: This paper presents data on the first identification, characterization and quantification of hepatotoxic microcystins and neurotoxic anatoxin-a in water samples of Lake Baringo, Kenya. The shallow turbid Lake Baringo was investigated five times between June 2001 and May 2002. The phytoplankton community was mainly dominated by the cyanobacterium Microcystis aeruginosa. Due to the high turbidity the phytoplankton biomass was low, ranging between 1.5 and 8.2 mg L-1. High mean total phosphorus concentration (1.0 mg L-1) and mean total nitrogen concentration (2.8 mg L-1) typical for hypertrophic lakes were found. Using HPLC technique the hepatotoxins microcystin-LR, -RR and -YR and the neurotoxin anatoxin-a were detected in the water samples. The microcystin concentrations varied from 310 to 19800 μg microcystin-LR equivalents g-1 DW and the anatoxin-a concentration ranged from 270 to 1260 μg g-1 DW. To our knowledge this is the first evidence of cyanobacterial toxins in Lake Baringo.
    Description: Dissertation zur Erlangung des akademischen Grades des Doktors der Naturwissenschaften (Dr. rer. nat.) eingereicht im Fachbereich Biologie, Chemie, Pharmazie der Freien Universität Berlin
    Description: Unpublished
    Keywords: Biological poisons ; Poisonous organisms ; Bacteria ; Phytoplankton ; Cyanobacteria
    Repository Name: AquaDocs
    Type: Report Section , Not Known
    Format: pp.51-66
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  • 2
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    Ontology-based mediation of OGC catalogue service for the Web requests: a virtual solution for integrating coastal web atlases. (2015)
    Springer | Berlin
    Details
    Publication Date: 2021-05-19
    Description: In recent years significant momentum has occurred in the development of Internet resources for decision makers and scientists interested in the coast. Chief among these has been the development of coastal web atlases (CWAs). While multiple benefits are derived from these tailor-made atlases (e.g., speedy access to multiple sources of coastal data and information), the potential exists to derive added value from the integration of disparate CWAs, to optimize decision making at a variety of levels and across themes. This paper describes the development of a semantic mediator prototype to provide a common access point to coastal data, maps and information from distributed CWAs. The prototype showcases how ontologies and ontology mappings can be used to integrate different heterogeneous and autonomous atlases, using the Open Geospatial Consortium’s Catalogue Services for the Web.
    Description: Published
    Keywords: Coastal web atlas ; Coastal atlas ; Data semantics ; Semantic web technologies ; Information retrieval ; GIS ; Ontologies ; Catalogue services for the web (CSW) ; Mediation
    Repository Name: AquaDocs
    Type: Conference Material , Refereed
    Format: 6pp.
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  • 3
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    Basic models of seismicity: temporal models, Theme V (2012)
    Community Online Resource for Statistical Seismicity Analysis
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    Publication Date: 2020-02-12
    Keywords: 550 - Earth sciences
    Type: info:eu-repo/semantics/report
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  • 4
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    Basic models of seismicity: spatiotemporal models, Theme V (2011)
    Community Online Resource for Statistical Seismicity Analysis
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    Publication Date: 2020-02-12
    Keywords: 550 - Earth sciences
    Type: info:eu-repo/semantics/report
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  • 5
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    Levy walks evolve through interaction between movement and environmental complexity (2011)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2011-06-28
    Description: Ecological theory predicts that animal movement is shaped by its efficiency of resource acquisition. Focusing solely on efficiency, however, ignores the fact that animal activity can affect resource availability and distribution. Here, we show that feedback between individual behavior and environmental complexity can explain movement strategies in mussels. Specifically, experiments show that mussels use a Levy walk during the formation of spatially patterned beds, and models reveal that this Levy movement accelerates pattern formation. The emergent patterning in mussel beds, in turn, improves individual fitness. These results suggest that Levy walks evolved as a result of the selective advantage conferred by autonomously generated, emergent spatial patterns in mussel beds. Our results emphasize that an interaction between individual selection and habitat complexity shapes animal movement in natural systems.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉de Jager, Monique -- Weissing, Franz J -- Herman, Peter M J -- Nolet, Bart A -- van de Koppel, Johan -- New York, N.Y. -- Science. 2011 Jun 24;332(6037):1551-3. doi: 10.1126/science.1201187.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Spatial Ecology Department, Netherlands Institute of Ecology (NIOO-KNAW), Yerseke, Netherlands. m.dejager@nioo.knaw.nl〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21700872" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Biological Evolution ; Computer Simulation ; Cyanobacteria ; *Ecosystem ; Environment ; Feeding Behavior ; Genetic Fitness ; Locomotion ; Models, Biological ; Mytilus edulis/*physiology ; Population Density ; Probability ; Selection, Genetic
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 6
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    Stochastic community assembly causes higher biodiversity in more productive environments (2010)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2010-05-29
    Description: Net primary productivity is a principal driver of biodiversity; large-scale regions with higher productivity generally have more species. This pattern emerges because beta-diversity (compositional variation across local sites) increases with productivity, but the mechanisms underlying this phenomenon are unknown. Using data from a long-term experiment in replicate ponds, I show that higher beta-diversity at higher productivity resulted from a stronger role for stochastic relative to deterministic assembly processes with increasing productivity. This shift in the relative importance of stochasticity was most consistent with the hypothesis of more intense priority effects leading to multiple stable equilibria at higher productivity. Thus, shifts in community assembly mechanisms across a productivity gradient may underlie one of the most prominent biodiversity gradients on the planet.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Chase, Jonathan M -- New York, N.Y. -- Science. 2010 Jun 11;328(5984):1388-91. doi: 10.1126/science.1187820. Epub 2010 May 27.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biology and Tyson Research Center, Washington University, St. Louis, MO 63130, USA. jchase@wustl.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/20508088" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Biodiversity ; Cyanobacteria ; *Ecosystem ; Environment ; Eukaryota ; Extinction, Biological ; Food Chain ; *Fresh Water ; Photosynthesis ; Plants ; Population Dynamics ; Stochastic Processes
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 7
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    Elastische Eigenschaften von Mineralen bei hohen Drücken (2009)
    Berlin
    Details
    Publication Date: 2020-02-12
    Keywords: 550 - Earth sciences
    Type: info:eu-repo/semantics/other
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  • 8
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    Ornithology. The pink death: die-offs of the lesser flamingo raise concern (2006)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2006-09-23
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Koenig, Robert -- New York, N.Y. -- Science. 2006 Sep 22;313(5794):1724-5.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16990528" target="_blank"〉PubMed〈/a〉
    Keywords: Africa, Eastern/epidemiology ; Animals ; *Animals, Wild ; Bacterial Toxins/analysis/toxicity ; Behavior, Animal ; Bird Diseases/*epidemiology ; *Birds ; *Conservation of Natural Resources ; Cyanobacteria ; *Ecosystem ; Feeding Behavior ; Fresh Water ; Hydrogen-Ion Concentration ; Population Density ; Population Dynamics ; Temperature
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 9
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    Self-assembled silica-carbonate structures and detection of ancient microfossils (2003)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2003-11-15
    Description: We have synthesized inorganic micron-sized filaments, whose microstucture consists of silica-coated nanometer-sized carbonate crystals, arranged with strong orientational order. They exhibit noncrystallographic, curved, helical morphologies, reminiscent of biological forms. The filaments are similar to supposed cyanobacterial microfossils from the Precambrian Warrawoona chert formation in Western Australia, reputed to be the oldest terrestrial microfossils. Simple organic hydrocarbons, whose sources may also be abiotic and indeed inorganic, readily condense onto these filaments and subsequently polymerize under gentle heating to yield kerogenous products. Our results demonstrate that abiotic and morphologically complex microstructures that are identical to currently accepted biogenic materials can be synthesized inorganically.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Garcia-Ruiz, J M -- Hyde, S T -- Carnerup, A M -- Christy, A G -- Van Kranendonk, M J -- Welham, N J -- New York, N.Y. -- Science. 2003 Nov 14;302(5648):1194-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Instituto Andaluz de Ciencias de la Tierra, Consejo Superior de Investigaciones Cientificas Universidad de Granada, Facultad de Ciencias, Campus de Fuentenueva 18002, Granada, Spain.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/14615534" target="_blank"〉PubMed〈/a〉
    Keywords: Australia ; Barium/chemistry ; Carbonates/*chemistry ; Crystallization ; Cyanobacteria ; Exobiology ; Formaldehyde/chemistry ; *Fossils ; Geologic Sediments/*chemistry ; Hydrocarbons/*chemistry ; Hydrogen-Ion Concentration ; Life ; Microscopy, Electron ; Microscopy, Electron, Scanning ; Molecular Conformation ; Phenol/chemistry ; Silicon Dioxide/*chemistry ; Temperature ; X-Ray Diffraction
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 10
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    Proteins 'clock' the origins of all creatures--great and small (1996)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1996-01-26
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Morell, V -- New York, N.Y. -- Science. 1996 Jan 26;271(5248):448.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/8560255" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Archaea/classification ; Bacteria/classification ; Cyanobacteria ; Enzymes/*chemistry ; *Eukaryotic Cells/classification/enzymology ; *Evolution, Molecular ; Fossils ; Phylogeny ; *Prokaryotic Cells/classification/enzymology
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 11
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    Microfossils of the Early Archean Apex chert: new evidence of the antiquity of life (1993)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1993-04-30
    Description: Eleven taxa (including eight heretofore undescribed species) of cellularly preserved filamentous microbes, among the oldest fossils known, have been discovered in a bedded chert unit of the Early Archean Apex Basalt of northwestern Western Australia. This prokaryotic assemblage establishes that trichomic cyanobacterium-like microorganisms were extant and morphologically diverse at least as early as approximately 3465 million years ago and suggests that oxygen-producing photoautotrophy may have already evolved by this early stage in biotic history.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Schopf, J W -- New York, N.Y. -- Science. 1993 Apr 30;260:640-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Earth and Space Sciences, University of California, Los Angeles 90024, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11539831" target="_blank"〉PubMed〈/a〉
    Keywords: Bacteria ; *Biological Evolution ; Cyanobacteria ; Environmental Microbiology ; *Fossils ; Geologic Sediments/*analysis/*microbiology ; *Paleontology ; Prokaryotic Cells/*classification ; Western Australia
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 12
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    The early evolution of eukaryotes: a geological perspective (1992)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1992-05-01
    Description: Molecular phylogenies of eukaryotic organisms imply patterns of biological and environmental history that can be tested against the geological record. As predicted by sequence comparisons, Precambrian rocks show evidence of episodic increases in biological diversity and atmospheric oxygen concentrations. Nonetheless, complete integration of the two records remains elusive and may require that the earliest macroscopic organisms be recognized as extinct experiments in eukaryotic multicellularity.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Knoll, A H -- New York, N.Y. -- Science. 1992 May 1;256(5057):622-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Harvard University, Botanical Museum, Cambridge, MA 02138.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/1585174" target="_blank"〉PubMed〈/a〉
    Keywords: *Biological Evolution ; Cyanobacteria ; Eukaryota ; *Eukaryotic Cells ; Fossils ; Geological Phenomena ; *Geology ; Mitochondria ; Phylogeny
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 13
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    Early Archean (3.3-billion to 3.5-billion-year-old) microfossils from Warrawoona Group, Australia (1987)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1987-07-03
    Description: Cellularly preserved filamentous and colonial fossil microorganisms have been discovered in bedded carbonaceous cherts from the Early Archean Apex Basalt and Towers Formation of northwestern Western Australia. The cell types detected suggest that cyanobacteria, and therefore oxygen-producing photosynthesis, may have been extant as early as 3.3 billion to 3.5 billion years ago. These fossils are among the oldest now known from the geologic record; their discovery substantiates previous reports of Early Archean microfossils in Warrawoona Group strata.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Schopf, J W -- Packer, B M -- New York, N.Y. -- Science. 1987 Jul 3;237:70-3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Earth and Space Sciences, University of California, Los Angeles 90024, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11539686" target="_blank"〉PubMed〈/a〉
    Keywords: Carbon/analysis ; Cyanobacteria ; *Environmental Microbiology ; *Fossils ; Geologic Sediments/*microbiology ; Oxygen/analysis/metabolism ; Photosynthesis/physiology ; Western Australia
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 14
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    Gram-positive bacteria: possible photosynthetic ancestry (1985)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1985-01-01
    Description: A 16S ribosomal RNA gene has been sequenced from Heliobacterium chlorum, the recently discovered photosynthetic bacterium that contains a novel form of chlorophyll. Comparisons with other 16S ribosomal RNA sequences show that the organism belongs to the Gram-positive bacteria (one of ten eubacterial "phyla")--more precisely to the so-called low G + C (G, guanine; C, cytosine) subdivision thereof. This brings to five the number of such phyla that contain photosynthetic species, the other four being the purple bacteria and relatives, the green sulfur bacteria, the green nonsulfur bacteria, and the cyanobacteria. The finding suggests that Gram-positive bacteria may be of photosynthetic ancestry, and it strengthens the case for a common photosynthetic ancestry for all eubacteria.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Woese, C R -- Debrunner-Vossbrinck, B A -- Oyaizu, H -- Stackebrandt, E -- Ludwig, W -- New York, N.Y. -- Science. 1985;229:762-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Genetics and Development, University of Illinois, Urbana 61801, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11539659" target="_blank"〉PubMed〈/a〉
    Keywords: Bacteria ; Base Sequence ; *Biological Evolution ; Chlorobi ; Chlorophyll/analysis ; Cyanobacteria ; Cytosine/analysis ; DNA, Bacterial/analysis/chemistry/genetics ; Gram-Positive Bacteria/*classification/genetics/physiology ; Guanine/analysis ; Molecular Sequence Data ; Oligonucleotides/analysis/chemistry/genetics ; Photosynthesis/*genetics/physiology ; RNA, Bacterial/analysis/chemistry/genetics ; RNA, Ribosomal, 16S/analysis/chemistry/*genetics ; *Sequence Homology, Nucleic Acid
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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