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  • 1
    Electronic Resource
    Electronic Resource
    Bacterial Indicator Occurrence and the Use of an F+ Specific RNA Coliphage Assay to Identify Fecal Sources in Homosassa Springs, Florida (2000)
    Springer
    Microbial ecology 39 (2000), S. 56-64 
    Details
    ISSN: 1432-184X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A microbiological water quality study of Homosassa Springs State Wildlife Park (HSSWP) and surrounding areas was undertaken. Samples were collected in November of 1997 (seven sites) and again in November of 1998 (nine sites). Fecal bacterial concentrations (total and fecal coliforms, Clostridium perfringens, and enterococci) were measured as relative indicators of fecal contamination. F+-specific coliphage genotyping was performed to determine the source of fecal contamination at the study sites. Bacterial levels were considerably higher at most sites in the 1997 sampling compared to the 1998 sampling, probably because of the greater rainfall that year. In November of 1997, 2 of the 7 sites were in violation of all indicator standards and guidance levels. In November of 1998, 1 of 9 sites was in violation of all indicator standard and guidance levels. The highest concentrations of all fecal indicators were found at a station downstream of the animal holding pens in HSSWP. The lowest levels of indicators were found at the Homosassa Main Spring vent. Levels of fecal indicators downstream of HSSWP (near the point of confluence with the river) were equivalent to those found in the Southeastern Fork and areas upstream of the park influences. F+ specific RNA coliphage analysis indicated that fecal contamination at all sites that tested positive was from animal sources (mammals and birds). These results suggest that animal (indigenous and those in HSSWP) and not human sources influenced microbial water quality in the area of Homosassa River covered by this study.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002489900193
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    A possible cause of strawberry June Yellows–a degenerative, non-infectious condition (1992)
    Oxford, UK : Blackwell Publishing Ltd
    Plant pathology 41 (1992), S. 0 
    Details
    ISSN: 1365-3059
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3059.1992.tb02434.x
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Induction of tetraploidy in Buddleia globosa (2000)
    Springer
    Plant cell, tissue and organ culture 63 (2000), S. 121-125 
    Details
    ISSN: 1573-5044
    Keywords: Buddleia × weyeriana ; colchicine ; flow cytometry ; micropropagation ; ploidy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The aim was to produce a tetraploid form of Buddleia globosa to facilitate introgression of yellow flower colour into B. davidii, which is naturally tetraploid. Protocols were established for the micropropagation of B. globosa and tetraploid plants were obtained by application in vitro of colchicine to pre-cultured excised nodal sections. Three concentrations of colchicine were applied (0.01%, 0.05% and 0.1% w/v) for 1, 2 or 3 days. At 0.01% tetraploids were produced only after 2 days of application. All other treatments produced at least one tetraploid. The colchicine technique was extremely effective: of 29 lines tested, 19 were tetraploid and 5 were mixoploid. The vegetative characteristics of these tetraploids are described and the flowering characteristics of the three that flowered.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006434803003
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    Paper (German National Licenses)
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