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  • 1
    Electronic Resource
    Electronic Resource
    Freshwater zooplankton in the Hawkesbury-Nepean River: comparison of community structure with other rivers (1998)
    Springer
    Hydrobiologia 377 (1998), S. 133-145 
    Details
    ISSN: 1573-5117
    Keywords: Australian river ; microzooplankton ; taxonomic richness ; density ; correlations ; environmental variables
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The Hawkesbury-Nepean River is a regulated coastal river in New South Wales, Australia. Between March 1992 and March 1993, the freshwater portion of the river was inhabited by a taxonomically rich (total: 116 taxa) and dense (annual mean community density: up to 1024 animals l-1) microzooplankton community, comparable to that in some of the large regulated temperate rivers in the Northern Hemisphere. The common zooplankton taxa in the river were similar to those observed in other rivers at the genus or species level, with a characteristic increase in protists ( Vorticella spp.) towards the downstream reaches of the river. Zooplankton community density in the Hawkesbury-Nepean River was, to some degree, predictable from river environmental variables: density was significantly negatively correlated with river flow rate but positively correlated with temperature, turbidity, conductivity, total phosphorus and chlorophyll a. The results of the present study generally conform to the hypothesis of similar structure of zooplankton communities in rivers, relative to that in lakes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003240511366
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  • 2
    Electronic Resource
    Electronic Resource
    Relationship Between Changes of Active Oxygen Metabolism and Blood Flow and Formation, Progression, and Recovery of Lesions in Gastric Mucosa of Rats with a Single Treatment of Compound 48/80, a Mast Cell Degranulator (1997)
    Springer
    Digestive diseases and sciences 42 (1997), S. 1221-1232 
    Details
    ISSN: 1573-2568
    Keywords: COMPOUND 40/80 ; MAST CELL DEGRANULATOR ; GASTRIC MUCOSA ; MUCOSAL LESION RAT ; ACTIVE OXYGEN METABOLISM ; OXIDATIVE STRESS ; BLOOD FLOW ; ISCHEMIA-REPERFUSION
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The relationship between the changes of activeoxygen metabolism and blood flow and the formation,progression, and recovery of lesions was examined in thegastric mucosa of rats treated once with compound 48/80, a mast cell degranulator. Gastricmucosal lesions appeared 0.5 hr after compound 48/80treatment, became worst at 3 hr, and recovered fairlywell at 12 hr. Increases in gastric mucosal lipidperoxide content and xanthine oxidase andmyeloperoxidase activities and decreases in gastricmucosal vitamin E and hexosamine contents andSe-dependent glutathione peroxidase activity occurredwith the formation and progression of gastric mucosal lesions.These changes were attenuated with the recovery of thelesion. Gastric mucosal nonprotein SH content decreasedwith the formation of gastric mucosal lesions, and this decreased SH content returned to nearthe original level with lesion progression. No changesin gastric mucosal superoxide dismutase and catalaseactivities occurred with the formation, progression, and recovery of gastric mucosal lesions.Gastric mucosal blood flow decreased with the formationof gastric mucosal lesions, and this decreased bloodflow recovered with lesion progression. Serum serotonin concentration, an index of mast celldegranulation, increased with the formation of gastricmucosal lesions, and this increased serotonin level wasattenuated with lesion progression and recovery.Pretreatment with ketotifen, a connective tissue mast cellstabilizer, prevented the formation of gastric mucosallesions, the increases of gastric mucosal lipid peroxidecontent, xanthine oxidase and myeloperoxidase activities, and serum serotonin level; and thedecreases of gastric mucosal nonprotein SH content,glutathione peroxidase activity, and blood flow found at0.5 hr after compound 48/80 treatment. These results indicate that the changes of gastric mucosalactive oxygen metabolism and blood flow are closelyrelated to the formation, progression, and recovery ofgastric mucosal lesions in rats with a single compound 48/80 treatment. The present results alsosuggest that this compound 48/80-induced gastric mucosalinjury could be a kind of ischemia-reperfusion-inducedinjury occurring through degranulation of connective tissue mast cells.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018854107623
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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