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  • Springer  (53)
  • Geological Society of America (GSA)
  • 2000-2004  (34)
  • 1970-1974  (19)
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  • 1
    Electronic Resource
    Electronic Resource
    Karyotypes of two Australian hylids (1970)
    Springer
    Chromosoma 30 (1970), S. 38-50 
    Details
    ISSN: 1432-0886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Karyotypes of the Australian frogs Hyla caerulea (White) and Hyla phyllochroa Günther were prepared and analysed from colchicine-treated, primary cultures of adult heart, lung and kidney. The diploid chromosome number for both species is 26, which resembles that of most known karyotypes of Papuan hylids but differs from that of the genus Hyla in other regions. A statistical comparison, involving data from arm ratios, centromere indices and relative lengths of metaphase chromosomes of H. caerulea incubated at 31 and 37° C respectively, showed that the differences were non-significant at the 5% level. Similar treatment of data from cells of Hyla caerulea and Hyla phyllochroa incubated at 31°C failed to show a significant species difference. Absolute lengths of haploid chromosome complements of the two species at the same temperature were found to differ significantly. No evidence of sexual heteromorphism was found. The occurrence of a terminally situated, heterochromatic zone associated with the longer arm of the 11th pair of chromosomes is described and compared with the known condition in other hylids.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00293908
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  • 2
    Electronic Resource
    Electronic Resource
    Inter-specific relationships ofLeiopelma (Amphibia: Anura): Further karyological evidence (1974)
    Springer
    Cellular and molecular life sciences 30 (1974), S. 1248-1250 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Résumé Le caryotype de la grenouille couramment classée sous le nom deLeiopelma hamiltoni McCulloch, de l'île de Maude, en Nouvelle Zélande, est décrit pour la première fois. A l'état diploïde, le nombre des chromosomes est de 18. La plus petite des paires est acrocentrique et présente de petits satellites terminaux. On n'observe pas de microchromosomes. Pendant la diacinèse de la meïose mâle on peut observer des chromosomes bivalents avec 2 chiasmas terminaux. L'évidence caryologique est en accord avec les indications précédentes concernant l'aspect extérieur et l'anatomie du squelette:L. hamiltoni ressemble davantage àL. archeyi, qu'àL. hostetteri. On suggère la nécessité d'une réévaluation taxonomique du genre.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01945165
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  • 3
    Electronic Resource
    Electronic Resource
    Effects of natural toad serum on heterologous vertebrate cells (1972)
    Springer
    Cellular and molecular life sciences 28 (1972), S. 466-467 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Résumé Le sérum et le plasma, nouvellement préparés, de l'AmphibienBufo marinus, ont, in vitro, un effet rapidement cytotoxique sur des cellules normales et malignes des autres Vertébrés.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02008345
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  • 4
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    Effects of natural toad serum on heterologous vertebrate cells (1972)
    Springer
    Details
    Publication Date: 1972-04-01
    Print ISSN: 0014-4754
    Topics: Biology , Medicine
    Published by Springer
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  • 5
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    Inter-specific relationships ofLeiopelma (Amphibia: Anura): Further karyological evidence (1974)
    Springer
    Details
    Publication Date: 1974-11-01
    Print ISSN: 0014-4754
    Topics: Biology , Medicine
    Published by Springer
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    PAPER CURRENT
  • 6
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    Karyotypes of two Australian hylids (1970)
    Springer
    Details
    Publication Date: 1970-01-01
    Print ISSN: 0009-5915
    Electronic ISSN: 1432-0886
    Topics: Biology , Medicine
    Published by Springer
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    PAPER CURRENT
  • 7
    Electronic Resource
    Electronic Resource
    Analysis of a swallow homologue from Drosophila pseudoobscura (2000)
    Springer
    Development genes and evolution 210 (2000), S. 157-161 
    Details
    ISSN: 1432-041X
    Keywords: Key words Swallow ; bicoid ; Drosophila ; mRNA localization ; Oogenesis ; Embryogenesis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  We analyzed a functional homologue of the swallow gene from Drosophila pseudoobscura. The swallow gene of D. melanogaster plays an essential role in localizing bicoid mRNA in oocytes, and swallow mutant embryos show anterior pattern defects that result from the lack of localization of the bicoid morphogen. The pseudoobscura homologue rescues the function of swallow mutants when introduced into the genome of D. melanogaster, and its expression is similar to that of the melanogaster gene. The predicted pseudoobscura and melanogaster proteins are 49% identical and 69% conserved. The coiled-coil domain previously identified in the melanogaster swallow protein is strongly conserved in the pseudoobscura homologue, but the weak similarity of the melanogaster swallow protein to the RNP class of RNA-binding proteins is not conserved in the pseudoobscura homologue. These and other observations suggest a structural role for swallow in localizing bicoid mRNA, perhaps as part of the egg cytoskeleton.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004270050023
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  • 8
    Electronic Resource
    Electronic Resource
    Reliability of dipole-dipole electrical resistivity tomography for defining depth to bedrock in covered karst terranes (2000)
    Springer
    Environmental geology 39 (2000), S. 760-766 
    Details
    ISSN: 1432-0495
    Keywords: Key words Karst terranes ; Electrical resistivity tomography ; Sinkholes ; Pinnacles and cutters
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract  Sinkhole collapse is one of the main limitations on the development of karst areas, especially where bedrock is covered by unconsolidated material. Studies of sinkhole formation have shown that sinkholes are likely to develop in cutter (enlarged joint) zones as a result of subterranean erosion by flowing groundwater. Because of the irregular distribution of pinnacles and cutters on the bedrock surface, uncertainties arise when "hit-or-miss" borehole drilling is used to locate potential collapse sites. A high-resolution geophysical technique capable of depicting the details of the bedrock surface is essential for guiding the drilling program. Dipole-dipole electrical resistivity tomography (ERT) was used to map the bedrock surface at a site in southern Indiana where limestone is covered by about 9 m of clayey soils. Forty-nine transects were conducted over an area of approximately 42,037 m2. The electrode spacing was 3 m. The length of the transects varied from 81 to 249 m. The tomographs were interpreted with the aid of soil borings. The repeatability of ERT was evaluated by comparing the rock surface elevations interpreted from pairs of transects where they crossed each other. The average difference was 2.4 m, with a maximum of 10 m. The discrepancy between interpreted bedrock-surface elevations for a transect intersection may be caused by variations in the subsurface geology normal to the transect. Averaging the elevation data interpreted from different transects improved the ERT results. A bedrock surface map was generated using only the averaged elevation data at the transect junctions. The accuracy of the map was further evaluated using data from four exploratory boreholes. The average difference between interpreted and actual bedrock surface-elevations was less than 0.4 m. The map shows two large troughs in the limestone surface: one coinciding with an existing sinkhole basin, while the other is in alignment with a small topographic valley. Because sinkholes were observed at the same elevation interval in similar valleys in the vicinity, the delineated trough may have implications for future land use at the site.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002540050491
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  • 9
    Electronic Resource
    Electronic Resource
    Minimal topological groups (1971)
    Springer
    Mathematische Annalen 192 (1971), S. 193-195 
    Details
    ISSN: 1432-1807
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02052870
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  • 10
    Electronic Resource
    Electronic Resource
    Vitamin addition: an option for sustainable activated sludge process effluent quality (2000)
    Springer
    Journal of industrial microbiology and biotechnology 24 (2000), S. 267-274 
    Details
    ISSN: 1476-5535
    Keywords: Keywords: vitamins; activated sludge; industrial wastewater; porous pots; Amtox™
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The process performance and metabolic rates of samples of activated sludge dosed with vitamin supplements have been compared. After initial screening, four vitamins and two metals as single supplements and in pairs, were dosed continuously into the mixed liquor of an activated sludge simulation. Toxicity, oxygen demand removal, respiration rates and suspended solids were measured to monitor the effect on process efficiency. It was confirmed experimentally that an industrial wastewater stream did not contain a sufficient supply of micronutrients for efficient biological treatment. This was concluded from the observation that control sludge batches (receiving no supplements) averaged chemical oxygen demand removal efficiency of 58%. Dosing micronutrients into the mixed liquor produced removal efficiencies of up to 69%. Some of the supplements increased the respiration rate of the sludge while some decreased it, indicating a range of stimulatory and inhibitory effects. Complex interactions between micronutrients that were dosed simultaneously were evident. Several positive effects led to the conclusion that micronutrients have the potential to optimise process performance of activated sludge plants treating industrial wastewater. The addition of phosphorus/niacin and molybdenum/lactoflavin removed wastewater components that were toxic to nitrifiers as indicated through toxicity testing, thus protecting downstream nitrification/denitrification treatment processes. Journal of Industrial Microbiology & Biotechnology (2000) 24, 267–274.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/sj.jim.2900817
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