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  • 1
    Keywords: Hochschulschrift
    Type of Medium: Online Resource
    Pages: Online-Ressource (95 Seiten, 3 MB) , Illustration, Diagramme
    Language: German
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  • 2
    Publication Date: 2022-06-23
    Description: Pelagic tar has been collected daily on a transsect from off Prtugal to south of the Canary Islands in January/February 1975. A new neuston sampler was used which may be towed at speeds between 7 and 10 knots (DERENBACH & EHRHARDT 1975). A total of 22 samples was taken. Dimensions of tar balls ranged from potatoe-size to small specks approximately 1 mm in diameter. Concentrations were found to vary between 20.5 and 0.007 mg/m2, except for one instance of an extremely high tar concentration of 2270 mg/m2. 49 GC analyses were made. 61% showed bimodal peak distributions characteristic of crude oil sludges. The composition of tar balls was independent of their size suggesting diffusion controlled degradation.
    Type: Article , PeerReviewed
    Format: text
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  • 3
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    In:  (PhD/ Doctoral thesis), Christian-Albrechts-Universität Kiel, Kiel, Germany, 93 pp
    Publication Date: 2017-09-14
    Type: Thesis , NonPeerReviewed
    Format: text
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  • 4
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    Institut für Meereskunde
    Publication Date: 2022-04-29
    Description: Das Ergebnis der RNS-Messung über die Orcin-Methode wird durch zwei Verbesserungen präzisiert: 1. Ribose als Eichsubstanz erhöht die Reproduzierbarkeit. 2. Der Einfluß interferierender Zucker, wie Glucose Galactose und Mannose, wird durch die Messung bei zwei Wellenlängen eliminiert. Damit läßt sich der tatsächliche RNS-Gehalt berechnen, sofern das ungefähre Gewichtsverhältnis der die Bestimmung störenden Zucker bekannt ist.
    Type: Article , NonPeerReviewed
    Format: text
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  • 5
    Publication Date: 2022-04-29
    Description: Relevant literature and the author's own research support the assumption that apparently homogeneous plankton communities arc subject to marked variability with regard to the physiological condition of individual organisms. This gives rise to difficulties when conducting analyses for productivity, as only integrating methods have hitherto been in use. Thc difference between the obtained values and their postulated precision becomes even greater when the investigation is extended to include normally heterogeneous natural plankton communities. A combination of integrating and cytological methods can effectively overcome such difficulties without involving an unreasonably greater expenditure of time and labour. Adequate cytological methods are searched for. By reason of their high sensitivity and convenience, fluorometric methods are particulary suitable. Here the primary fluorescence of chlorophyll and the seconclary fluorescencc induced by berberine sulphate and primulin are employed. Thus s visual separation of phytoplankton organisms into categories according to chlorophyll content, nucleic acid content and living state becomes feasible. The possibilities opened by more quantitative fluorometric analyses are shortly summarized. Moreover, a mechanisation of these analysis methods, so essential to planktology, is projected.
    Type: Article , NonPeerReviewed
    Format: text
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  • 6
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    Institut für Meereskunde
    Publication Date: 2022-04-27
    Description: Die beschriebene Methode gestattet das Homogenisieren des Phytoplanktons, das Extrahieren des Chlorophylls und das daran anschließende Zentrifugieren auch bei kleinsten Probenmengen in ein und demselben abgeschlossenen Gefäß. Die so erzielte Chlorophyllausbeute ist höher als die herkömmlicher Methoden. In ihrer Wirksamkeit verglichen wird die vorgeschlagene Methode mit der 18-stündigen Extraktion ohne Vorbehandlung des Phytoplanktons und mit der 15-minütigen Extraktion nach voraufgegangenem "Grinding"; dabei wird der Grad der Homogenisation und Extraktion über den photometrisch gemessenen Chlorophyll-a-Gehalt und eine fluoreszenzmikroskopische Analyse des extrahierten Sediments kontrolliert. A method is described, which allows the homogenisation of phytoplankton, the extraction of chlorophyll, and the centrifugation of even the smallest samples in a stoppered glass tube. The yield of this method is higher than that of any other known method for the determination of chlorophyll. The effectiveness of the proposed method is compared with the 18 hours extraction method without any preliminary treatment of the phytoplankton and with the so called "grinding method". In this comparison the rate of homogenisation and extraction ist controlled for all three methods by the photometric measurement of the chlorophyll a content and by the fluorescence microscopical analysis of the extracted sediment.
    Type: Article , NonPeerReviewed
    Format: text
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  • 7
    Publication Date: 2022-04-27
    Description: In den oberen 75 Metern Wassertiefe wurden neben dem Auszählen der Planktonorganismen chemische Nachweise durchgeführt auf Chlorophyll, Protein, RNA und die Gesamtheit einiger vorkommender Zucker. Diese und andere schon vorliegende Daten wurden auf ihre Aussagefähigkeit über die partikuläre Substanz und das lebende Plankton untersucht, um daran anschließend die Beziehungen zwischen den als aussagekräftig erkannten Werten herzustellen. Die damit ermöglichte Beschreibung des Planktonbestandes gestattet dann zwar die Konstatierung eines tiefenabhängigen, unterschiedlichen physiologischen Zustandes dominierender Organismen, doch werden hierbei auch die Aussagegrenzen summarisch-chemischer Bestimmungsmethoden sichtbar. The investigations were limited to the upper 75 meters. Here besides a counting of plankton organisms chemical determinations were performed for chlorophyll, protein, RNA, and the total amount of some occuring sugars. These and other data were compared as to their accuracy in estimating particulate matter and living organisms. Then it was searched for the relationship between values of recognized reliability. The resulting estimation of the plankton-stock permits the recognition of a varying physiological state of dominant organisms, depending on depth, though the limits of an account, given by chemical analysis of the entire amount of particulate matter, are reached.
    Type: Article , NonPeerReviewed
    Format: text
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