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  • 1
    Electronic Resource
    Electronic Resource
    Caridina nilotica in Lake Victoria: abundance, biomass, and diel vertical migration (1996)
    Springer
    Hydrobiologia 317 (1996), S. 177-182 
    Details
    ISSN: 1573-5117
    Keywords: zooplankton biomass ; Lake Victoria ; diel vertical migration ; Caridina ; Chaoborus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Caridina nilotica (Decapoda: Atyidae) in offshore waters of Lake Victoria were investigated with both day and night sampling over a period of two years. Offshore populations are mainly planktonic rather than benthic, and the animals exhibit diel vertical migrations into near-surface waters at night. These changes in diel abundance as well as the size-frequency distribution of the migrating shrimp suggest that the migratory behavior is in response to visual planktivory, because only the very smallest individuals (2–4 mm) remain in surface waters during the day. During October 1992, abundances were estimated both by vertical net sampling and by underwater video transect methods. Concordance was established between abundances estimated by the two methods. Only about 9% (night) to 14% (day) of the Caridina population appeared to be epibenthic. We suggest that the behavior of the animal is consistent with the hypothesis that it is not a strict detritivore as previously reported; rather it may engage in facultative planktivory, especially at night.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00036467
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Murine teratocarcinoma: A model for virus-cell interaction in a differentiating cell system (1981)
    New York, NY : Wiley-Blackwell
    Journal of Supramolecular Structure and Cellular Biochemistry 15 (1981), S. 205-211 
    Details
    ISSN: 0275-3723
    Keywords: murine teratocarcinoma ; embryonal carcinoma ; SV40 ; infection ; T antigen ; immunoprecipitation ; replication ; Chemistry ; Molecular Cell Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: The stem cell of the murine teratocarcinoma is refractory to infection with Simian virus 40 and polyoma. Utilizing various procedures, we attempted to alter this block to infection by modifying the infection procedure. Multiple infections with high-titer SV40 and pretreatment of cells with DEAE-dextran or the carcinogen 4-nitroquinoline l-oxide did not induce embryonal carcinoma cells to produce T- antigen. Co-infection with adenovirus 5, which infects the embryonal carcinoma, and SV40 did not induce the expression of SV40 Tantigen. Therefore, these procedures did not overcome the block to virus infection. The assay for the SV40 T antigen was immunofluorescence; however, the immunoprecipitation technique did not detect T antigen in the infected embryonal carcinoma cells. Finally, the viral DNA present in the embryonal carcinoma was examined for its ability to replicate. These studies showed that viral DNA was not replicating as assayed by the viral DNA's sensitivity to UV irradiation when replicating in the presence of 5-bromodeoxyundine.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jsscb.1981.380150211
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    Paper (German National Licenses)
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