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  • 1
    Electronic Resource
    Electronic Resource
    GROWTH INHIBITION OF HYDRILLA VERTICILLATA BY SELECTED LAKE SEDIMENT EXTRACTS (1980)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 16 (1980), S. 0 
    Details
    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Notes: : Sediments were investigated from two Florida lakes that have not been infested with the submersed, perennial, noxious plant Hydrilla verticillata. Aqueous extracts of the peat-like sediments from these lakes were shown to inhibit the growth of Hydrilla verticillata in laboratory systems. The extracts have substantial concentrations of organic carbon and iron. The apparent molecular weight of the inhibitory fraction is between 2,000 and 10,000, based upon ultrafiltration studies. Hydrilla growth was about 35 percent relative to control for a partially purified fraction at a level of 0.4 ppm organic carbon. Growth was measured as change in biomass (wet and dry) over a one-week period. The inhibitory material was highly fluorescent, dark brown, and inhibitory activity was lost after passage over an anion-exchange column (Cellex-D).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1752-1688.1980.tb02340.x
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  • 2
    Electronic Resource
    Electronic Resource
    Ferromagnetic Chromium Dioxide for Magnetic Tape (1971)
    s.l. : American Chemical Society
    Industrial and engineering chemistry 10 (1971), S. 319-329 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/i360039a013
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  • 3
    Electronic Resource
    Electronic Resource
    Potential Control of Florida Elodea by Ion-control Agents (1970)
    [s.l.] : Nature Publishing Group
    Nature 226 (1970), S. 181-182 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Fig. 1. Effect of treatment of elodea with ion-exchange resin, as measured by changes of dissolved oxygen with time. Control, solid bar; test, dashed bar. Control measures have had variable success. Elodea, for example, has been treated with chemicals such as sulphuric acid, copper sulphate, ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/226181a0
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  • 4
    Electronic Resource
    Electronic Resource
    Doubling the estimate of invertebrate biomass in a rainforest canopy (2004)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 429 (2004), S. 549-551 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Forest canopies represent the functional interface between 90% of the Earth's terrestrial biomass and the atmosphere and include some of the most threatened of all terrestrial ecosystems. However, we lack even a basic understanding of how the biomass of plants and animals is distributed ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nature02560
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  • 5
    Electronic Resource
    Electronic Resource
    DIQUAT DISTRIBUTION IN WATER AFTER APPLICATION TO SUBMERSED WEEDS (1994)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 30 (1994), S. 0 
    Details
    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Notes: : Diquat herbicide and rhodamine WT dye were applied in a lake to three 1.6 ha plots either with a polymer, which reportedly aids in sinking and confinement of aquatic herbicides, or without a polymer. Diquat and dye concentrations were measured at three different depths in the water column within the plots during the first three hours after application to determine vertical distribution of diquat and dye, and in composite samples at fixed distances from the plot up to 168 hours after application to determine movement out of the treated plots. Diquat and dye were homogeneous in the water column when no polymer was used, but were concentrated near the surface when polymer was used. This distribution may have resulted from temperature stratification. Polymer did not affect movement of diquat or dye out of the plots. The half-lives of diquat within the plots were 25 (SE=6.2) hr, 39 (SE=4.3) hr, and 25 (SE=2.0) hr. Forty-six percent of samples collected at the edges of the plots did not contain detectable diquat residues and only 66 percent of those samples with detectable diquat contained greater than the potable water tolerance (10 ppb). Diquat was not found in any samples 168 hours after application 61 m or farther from the edge of the plots. Dye and diquat concentrations were weakly correlated within and outside the plots. Dye half-lives were consistently higher than diquat, which suggests that the herbicide was removed from the water by plants and sediments more rapidly than dye.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1752-1688.1994.tb03276.x
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  • 6
    Electronic Resource
    Electronic Resource
    Choline activation of lithium transport (1973)
    Springer
    Cellular and molecular life sciences 29 (1973), S. 1249-1250 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Zusammenfassung Nachweis einer Erhöhung des Li-Austausches in Rinder-Erythrozyten bei Anwesenheit von Cholinchlorid im Extrazellularraum.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01935100
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  • 7
    Electronic Resource
    Electronic Resource
    Some effects of superparasitism byLixophaga diatraeae of sugarcane borer larvae in the laboratory (1976)
    Springer
    Entomologia experimentalis et applicata 20 (1976), S. 261-269 
    Details
    ISSN: 1570-7458
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Résumé Quand des larves deDiatraea saccharalis (Borer de la canne à sucre) sont parasitées par la TachinaireLixophaga diatraeae, la mortalité s'accroît avec l'augmentation du nombre de parasites hébergés par les larves-hôtes et cela, du début du 1er stade jusqu'au 4ème stade larvaire; cependant la mortalité est plus faible chez les larves les plus âgées au moment de l'attaque du parasite. La durée du développement larvaire des asticots de la Tachinaire est plus courte chez les larves hôtes les plus âgées et diminue également en fonction du nombre de parasites par hôte; toutefois la durée du développement nymphal n'est pas affectée par le superparasitisme. Par contre le poids des pupes du parasite décroît avec la densité du parasitisme. La taille des Tachinaires n'influence pas le choix des partenaires lors de l'accouplement, mais le nombre d'œufs pondus s'accroît avec le poids des femelles. Le superparasitisme n'affecte pas la longévité du diptère parasite, mais les femelles vivent plus longtemps que les mâles, qu'elles soient issues d'un hôte faiblement ou fortement parasité. Les asticots deLixophaga muent deux fois à l'intérieur de l'hôte; elles émergent au cours du 3ème stade larvaire pour la pupaison. Une compétition se manifeste entre les asticots, le taux de survie dépendant du nombre de parasites par larve-hôte, de la localisation des asticots sur le tronc trachéen longitudinal de l'hôte, et de la promiscuité entre ces larves endoparasites.
    Notes: Abstract A fly parasite,Lixophaga diatraeae (Townshend), of the sugarcane borer,Diatraea saccharalis (F.), is currently being produced at our laboratory to determine if it can be released periodically in sugarcane fields and control sugarcane borers. This parasite is reared on sugarcane borers in the laboratory. Frequently more than one parasite develops on a single host insect and host insects vary in size. When several parasites entered the same host some did not develop because of competition between them. This problem was more acute in young host sugarcane borers than in older sugarcane borers. The early 5th stage sugarcane borer larva was the most suitable stage for parasite development.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00573831
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  • 8
    Electronic Resource
    Electronic Resource
    The response of Gymnodinium breve to municipal waste materials (1974)
    Springer
    Marine biology 24 (1974), S. 223-228 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The response of the unarmored dinoflagellate Gymnodinium breve, which is the causative organism in catastrophic fish kills along the Florida Gulf coast, to enrichment with selected inorganic nutrients, municipal waste materials, and various detergent components has been determined. The biostimulatory effects of the various enrichments were determined by a modification of the Provisional Algal Assay Procedure of the Joint Industry/Government Task Force on Eutrophication. Inorganic nutrients (orthophosphate, nitrate, and ammonia) were added individually and in combination, and the results were compared to equivalent enrichments with the effluent from a secondary sewage-treatment plant. The maximum cell population, Nmax, attained could be increased 3-fold by the sew-age-treatment plant effluent or by the equivalent combination of inorganic nutrients; individually, however, the inorganic nutrients had no pronounced effect on maximum cell population, Nmax (except for a 30% increase produced by slight orthophosphate enrichment). The results of these studies indiccate that, at concentrations of orthophosphate typical of Florida coastal waters (ca. 0.10 ppm), the growth-promoting potential (as reflected by Nmax) of the medium was a linear function of the ammonia-nitrogen concentration (0.01 to 0.11 ppm). The sewage-treatment plant effluent was presumably low in detergent phosphate, having been obtained from a treatment plant some 6 months after the enactment of a ban on phosphate-containing detergents. Additions of orthophosphate or detergent-phosphate to the treatment-plant effluent did not significantly increase the observed biostimulatory effect of the waste material.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00391897
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  • 9
    Electronic Resource
    Electronic Resource
    Effect of selected surfactants on the growth characteristics of Gymnodinium breve (1974)
    Springer
    Marine biology 28 (1974), S. 253-259 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Growth studies of Gymnodinium breve in nutrient enriched and unenriched medium showed that anionic surfactants have the most deleterious effects on initial response, growth rate, and maximum cell numbers as compared with cationic and non-ionics. Degradation rates were determined, and the surfactant with the most favorable rate (C12 alkyl-benzene sulfonate) was further tested. The growth constant, K e , and maximum cell number, N max , decreased with increasing amount of surfactant added to G. breve cultures (enriched sea-water media); a minimum was observed at 12.5 ppb. Above this concentration the values of K e and N max increased to approach control values. This profile was ascribed to the formation of surfactant micelles that are ineffective. The surfactant produced mortality of G. breve (90% mortality versus 12% in untreated samples) in natural red-tide samples, but other algae and zooplankton were undisturbed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00388492
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  • 10
    Electronic Resource
    Electronic Resource
    Effect of temperature on the proliferation of Gymnodinium breve and Gomphosphaeria aponina (1977)
    Springer
    Marine biology 41 (1977), S. 71-77 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The effect of temperature on the growth and proliferation of two marine microorganisms, the toxigenic dinoflagellate Gymnodinium breve, and a potential bio-control organism, the blue-green alga Gomphosphaeria aponina, was determined by culturing the organisms in thermal gradients established by heating and cooling the opposite ends of an aluminum bar that had been adapted to hold culture tubes. Gradients were linear and stable for the duration of each trial. There was no relationship between variations in light and growth of the organisms. Gymnodinium breve showed optimum growth at 22°C, and proliferated over a range of temperatures (17° to 30°C). Below 17°C cultures of G. breve declined in growth, and at 4°C the organisms died within 5 h. Above 31°C there was rapid decline in viability of cells, and at 33.5°C the organism died within 24 h. Gomphosphaeria aponina showed optimum growth between 24° and 29°C, with a maximum at 27°C. Growth at temperatures greater than 31°C was minimal, but the organism survived. Limitation may be due to repression of the bio-synthesis of an iron-transport compound.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00390583
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