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  • 1
    Electronic Resource
    Electronic Resource
    Suitability of monosaccharides as markers for particle identification in carbonate sediments (1980)
    Oxford, UK : Blackwell Publishing Ltd
    Sedimentology 27 (1980), S. 0 
    Details
    ISSN: 1365-3091
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: The identification of the remains of organisms contributing to carbonate sediments by means of scanning electron-microscopy is limited to particles of the 2–20 μm size class. Mineralogy and the content of Mg, Sr and trace elements alone are usually insufficient to solve the problem of identification, especially in the differentiation between algal and coral aragonite. The organic matrix of calcareous organisms consists of stable biopolymers such as polysaccharides and glycoproteins which are intimately associated with the carbonate skeleton. Analysis of these hydrolysed compounds gives rise to characteristic arrays of monosaccharides which provide independent criteria for producer identification. The calcareous green algae Halimeda, Penicillus and Udotea show high xylose and low fucose levels. Xylose and fucose levels are elevated in the red algae Amphiroa but only fucose is prominent in the brown algae Padina. The corals Oculina, Porites, Millipora and Montastrea are relatively rich in fucose and show little or no xylose. In the bivalves Arca, Codakia and in Argopecten mannose may be characteristic. Analysis of artificial and natural sediments demonstrates that coral and algal aragonite can be distinguished on the basis of the total sugar concentration and respective xylose and fucose levels. The applicability of the technique in comparison to geochemical and mineralogical methods has been demonstrated for surface sediments from varying water depths of Harrington Sound, Bermuda.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3091.1980.tb01167.x
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  • 2
    Electronic Resource
    Electronic Resource
    Distribution of particulate amino acids in the Bransfield Strait (1986)
    Springer
    Polar biology 5 (1986), S. 199-206 
    Details
    ISSN: 1432-2056
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The depth distribution and composition of residual amino acids was determined in December 1980 in the Bransfield Strait. The major components were aspartic and glutamic acids together with alanine, glycine and serine. Non-protein amino acids were not found in significant amounts. On the average, the amino acids accounted for 25% of the total organic carbon and 50% of the organic nitrogen. Amino acid nitrogen/chlorophyll ratios indicated that in most euphotic zone samples phytoplankton in good physiological condition was present whereas heavily degraded material was found in deeper water layers. Statistical treatment and cluster analysis show distinct differences between euphotic and aphotic zone samples which could be used to characterize phytoplankton communities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00446087
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  • 3
    Electronic Resource
    Electronic Resource
    Fluorimatic analysis of dissolved and particulate humic compounds in the North Sea in May/June 1987 (1993)
    Springer
    Ocean dynamics 45 (1993), S. 255-266 
    Details
    ISSN: 1616-7228
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Description / Table of Contents: Zusammenfassung Gelöste und partikuläre Huminkomponenten wurden an Proben von drei Fahrten in der Nordsee im Sommer 1987 bestimmt. Beide Gruppen haben im allgemeinen eine negative Beziehung zur Salinität und verhalten sich damit konservativ. Partikuläre Verbindungen sind zusätzlich schwach negativ mit Gesamtchlorophyll und biogenem Opal korreliert, was auf Phytoplankton als eine zweitrangige Quelle hindeutet.
    Abstract: Résumé Composés humiques dissous et particulaires ont été determiné en échantillons prélevé pendant trois missions sur la Mer du Nord en été 1987. En géneral, les deux groupes montrent une rélation négative avec la salinité indicatif d'un rapport conservatif. De plus il existe une rélation positive entre les composés particulaires et le chlorophyll total et l'opal biogène qui suggère que le phytoplankton peut être une deuxième source de l'importance faible.
    Notes: Summary Dissolved and particulate humic compounds were determined on samples from three curises in the North Sea in summer 1987. Both groups generally show a negative correlation with salinity indicative of conservative behaviour. In addition, particulate compounds are weakly correlated with total chlorophyll and biogenic opal suggesting phytoplankton to be a secondary source.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02226383
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