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  • Key words Coronary artery disease – atherosclerosis – Chlamydia pneumoniae – chronic infection  (1)
  • Plankton  (1)
  • 1
    ISSN: 1437-3262
    Keywords: Micropalaeontology Palaeo-oceanography ; Plankton ; Sediment traps Recent and Holocene sediments ; Actualistic approach ; Norwegian-Greenland Sea
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract A synoptic study is carried out to reconstruct the development of the plankton community in the late Quaternary in the Norwegian-Greenland Sea. It comprises quantitative analyses of coccolithophores, dinoflagellate cysts, diatoms and radiolarians. An actualistic approach is applied to evaluate the different fossil records of these plankton groups. The preliminary results of the current investigation are reported here. The composition and distribution of living communities of coccolithophores are presented as an example. A close relationship between the distribution of regional groups and surface water masses is observed. Seasonal vertical fluxes of coccolithophores and radiolarians through the water column show similar patterns within different years. However, diatoms are highly variable, both in absolute fluxes and species composition. The differentiation of sporadic and periodic processes is evident only after several years of observation. During settling and sedimentation biotic and abiotic processes such as grazing, dissolution and lateral transport alter the assemblages. Investigation of death assemblages in surface sediments reveals that in spite of these alteration processes the abundance and species distribution are related to surface water masses. Higher abundances and diversities are usually found in sediments underlying the warm Norwegian Current. Concentrations decrease to the north-west towards the cold polar water masses. The sediment assemblages of all groups are strongly altered relicts of former living communities. They are characterized by distinct changes in species composition and absolute abundances related to palaeo-oceanographic development. Their variation through the sedimentary record is used to distinguish four ecostratigraphic units during the late Weichselian and Holocene.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1435-1285
    Keywords: Key words Coronary artery disease – atherosclerosis – Chlamydia pneumoniae – chronic infection ; Schlüsselwörter Koronare Herzkrankheit – Atherosklerose – Chlamydia pneumoniae – chronische Infektion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung In epidemiologischen Studien konnte nachgewiesen werden, daß eine Infektion mit Chlamydia pneumoniae zu einer deutlichen Erhöhung des Risikos für die Entwicklung einer koronaren Herzerkrankung führt. Im Kontext der Response-to-injury-Hypothese der Atherogenese erscheint eine ätiologische Rolle von C. pneumoniae als Ergänzung zu den etablierten Risikofaktoren vorstellbar. Verschiedene Pathomechanismen, darunter eine vermehrte Zytokinsynthese, proliferationsfördernde und proaggregatorische Mechanismen könnten die Effekte einer chronischen C.-pneumoniae-Infektion vermitteln. Tiermodelle und erste interventionelle Studien scheinen diese Hypothese zu unterstützen. In dieser Arbeit werden die bisher vorliegenden Daten zusammengestellt und mögliche Pathomechanismen des Risikofaktors C. pneumoniae diskutiert.
    Notes: Summary Several studies have demonstrated an association Chlamydia pneumoniae with coronary artery disease, suggesting that infection with C. pneumoniae increases the risk for coronary artery disease by factor 2 or more. Since atherosclerosis is considered to be a chronic inflammatory process, these data would fit into the response-to-injury hypothesis of atherosclerosis rather than representing a completely novel concept. Several pathomechanisms as increased cytokine synthesis, proliferative and proaggregatory effects could transmit the effects of chronic C. pneumoniae infection. Animal models and first clinical trials using antibiotic therapy seem to support an etiological role of C. pneumoniae in coronary artery disease. In this paper the current knowledge of the role of C- pneumoniae in coronary artery disease is reviewed and possible pathomechanisms are discussed.
    Type of Medium: Electronic Resource
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