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  • 1
    Electronic Resource
    Electronic Resource
    Performance characteristics and regeneration of a tetraphenylboron(III) selective electrode (1987)
    s.l. : American Chemical Society
    Analytical chemistry 59 (1987), S. 1078-1081 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac00135a002
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  • 2
    Electronic Resource
    Electronic Resource
    Potentiometric and thermal studies of a coated-wire antazoline-selective electrode (1988)
    s.l. : American Chemical Society
    Analytical chemistry 60 (1988), S. 758-761 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac00159a006
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  • 3
    Electronic Resource
    Electronic Resource
    Hexadecylpyridinium-phosphotungstate ion association in construction of a hexadecylpyridinium cation selective electrode (1988)
    s.l. : American Chemical Society
    Analytical chemistry 60 (1988), S. 2399-2402 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac00172a016
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  • 4
    Electronic Resource
    Electronic Resource
    Phytoplankton species composition and abundance in the Indian sector of the Antarctic Ocean (1986)
    Springer
    Polar biology 6 (1986), S. 161-169 
    Details
    ISSN: 1432-2056
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Water samples collected in the southwestern Indian Ocean between Africa and Antarctica in March 1980 were analyzed quantitatively for phytoplankton. Diatoms dominate the phytoplankton in this region and their numbers generally increase southward with peaks of abundance in both the northern Antarctic Zone and south of the Antarctic Divergence. Average cell numbers (i.e., 6.1×105 diatoms l-1 in the Antarctic Zone) are comparable to maximum numbers previously reported for the Southern Ocean. Dinoflagellates, flagellates and “monads” occur in highest concentrations north of the Polar Front. Their numbers are somewhat reduced south of the Antarctic Divergence, and are lowest in the Antarctic Zone. Various diatom assemblages are characteristic of different latitudinal zones. Waters north of and in the vicinity of the Polar Front are rich in the Nitzschia, Pseudonitzschia group of species. In the Antarctic Zone, Nitzschia “nana” and Dactyliosolen tenuijunctus dominate. Nitzschia species of the Fragilariopsis group are most numerous at stations south of the Antarctic Divergence. Striking differences are noted between the species compositions of quantitative and net-haul samples. A few nanoplanktonic diatoms (e.g. Nitzschia “nana” and single cells of Chaetoceros spp.) and the weakly silicified Dactyliosolen tenuijunctus, which are dominant in the quantitative samples, are either entirely absent or present only as solitary cells in the net collections.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00274879
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  • 5
    Electronic Resource
    Electronic Resource
    Spatial and temporal variations in phytoplankton biomass and primary productivity in the Southwest Atlantic and the Scotia Sea (1982)
    Springer
    Polar biology 1 (1982), S. 83-90 
    Details
    ISSN: 1432-2056
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Two cruises of the ARA/Islas Orcadas (late winter/early spring 1978 and late summer/early fall 1979) provided data which show that temporal variability of phytoplankton biomass and productivity in the oceanic wates of the Southwest Atlantic and Scotia Sea is insignificant when compared to the influence of geographical variability. Two bloom stations sampled during the late winter/early spring cruise had chlorophyll a concentrations and productivity values an order of magnitude higher than waters sampled from the same locations the following late summer/early fall. However, a comparison of 10 paired stations from the two cruises indicated no seasonal trend, as measured values of chlorophyll a and productivity from the first cruise were randomly larger or smaller than values measured during the second cruise. Consideration of individual stations from both seasons suggests the need to re-examine widely held notions regarding the effect of the Polar Front Zone and the “island-mass effect” on phytoplankton abundance and productivity. Higher-than-expected standing stock and productivity values at some open-ocean stations and at some stations within the Polar Front Zone indicate that looking for specific factors which promote localized enhancement or impoverishment of phytoplankton would be more useful than continuing with attempts to generalize Antarctic productivity data into broad seasonal or geographical patterns.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00263804
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  • 6
    Electronic Resource
    Electronic Resource
    Grazing of Euphausia superba Dana on natural phytoplankton populations (1983)
    Springer
    Polar biology 1 (1983), S. 193-197 
    Details
    ISSN: 1432-2056
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Selective feeding by Euphausia superba (krill) has been suggested from stomach content analysis (Nemoto 1971/1972) and from the comparison of krill and phytoplankton species distribution (Kawamura 1981). Laboratory experiments can help determine whether krill selectively graze certain phytoplankton species. Grazing experiments were conducted at Palmer Station, Antarctica, during the austral summer 1977/1978. krill, collected from waters surrounding the Antarctic Penninsula, were maintained in flow-thru aquaria at Palmer Station. E. superba were added to glass bottles (4.48 1), containing 220 μm mesh filtered sea water. Bottles, with and without krill, were incubated in the dark at sea surface temperature, for two to twenty-seven hours. End point determinations were made for phytoplankton cell number. The cell counts were divided into size and species categories, and the calculated filtering rates were compared through analysis of variance. These experiments led to the conclusion that krill “selectivity” for phytoplankton species is probably size dependent, with solitary cells smaller than 20 μm (maximum diameter) being filtered less rapidly than larger diatoms and chain forming species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00443187
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  • 7
    Electronic Resource
    Electronic Resource
    Electrochemical Behaviour of a Silver Electrode in NaOH Solutions (1998)
    Springer
    Monatshefte für Chemie 129 (1998), S. 1103-1117 
    Details
    ISSN: 1434-4475
    Keywords: Keywords. Cyclic voltammetry; Silver electrode; Alkaline solutions.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung.  Die Elektrochemie von Metallen und Legierungen stellt ein wichtiges Arbeitsgebiet in Forschung und Industrie dar. Die hier vorgestellte Untersuchung beinhaltet detaillierte Studien zur Korrosion und zum elektrochemischen Verhalten von Silber in wäßrigen Natriumhydroxidlösungen mittels cyclischer Voltammetrie, Chronoamperometrie und potentiostatischer Techniken. Die anodische Polarisationskurve von Ag in NaOH wird durch das Auftreten von fünf anodischen Peaks (A1–A5) charakterisiert. A1 resultiert aus der elektrochemischen Bildung von löslichen komplexen Species des Typs [Ag(OH)2]−, A2 aus jener von Ag2O, A3 geht auf Keimbildung und dreidimensionales Wachstum der Ag2O-Schicht zurück, A4 auf die Bildung von AgO, und A5 wird vermutlich durch die Bildung von Ag2O3 verursacht. Röntgendiffraktionsmuster bestätigen die Existenz passiver Ag2O- und AgO-Schichten an der Elektrodenoberfläche bei potentiodynamischer Polarisation bis zur Wasserstoffentwicklung. Der kathodische Teil der cyclischen Voltammogramme wird durch einen aktivierten anodischen Peak (A6, entsprechend der Elektrooxidation von Ag zu Ag2O) und drei kathodische Peaks (C1, C2, C2′, entsprechend der Elektroreduktion von AgO zu Ag2O und von Ag2O zu Ag) charakterisiert.
    Notes: Summary.  Studies of the electrochemistry of metals and alloys are very important fields of scientific and industrial work. The present investigation includes detailed studies on the corrosion and electrochemical behaviour of Ag in aqueous NaOH solutions under various conditions using cyclic voltammetry, chronoamperometry, and potentiostatic techniques. It was found that the anodic polarization curve of Ag in NaOH solutions is characterized by the occurrence of five anodic peaks (A1–A5). A1 is due to the electroformation of soluble [Ag(OH)2]− complex species, A2 to the electroformation of Ag2O, A3 to nucleation and three dimensional growth of the Ag2O layer, A4 to the formation of AgO, and A5 presumably to the formation of Ag2O3. X-ray diffraction patterns confirmed the existence of passive Ag2O and AgO layers on the electrode surface potentiodynamically polarized up to oxygen evolution. The cathodic part of the cyclic voltammograms is characterized by the occurrence of an activated anodic peak (A6) corresponding to the electrooxidation of Ag to Ag2O and three cathodic peaks (C1, C2, C2′) corresponding to the electroreduction of AgO to Ag2O and Ag2O to Ag, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/PL00010123
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  • 8
    Electronic Resource
    Electronic Resource
    Perchlorate Pitting Corrosion of a Passivated Silver Electrode (1999)
    Springer
    Monatshefte für Chemie 130 (1999), S. 1207-1216 
    Details
    ISSN: 1434-4475
    Keywords: Keywords. Pitting corrosion; Silver anode; Perchlorate anion.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung.  Passivierung und Lochfraßkorrosion einer Silberelektrode in Natriumperchlorat enthaltenden Natriumhydroxidlösungen wurden mit potentiodynamischen und potentiostatischen Methoden untersucht. In perchloratfreier alkalischer Lösung zeigt das Voltammogramm vor Beginn der Sauerstoffentwicklung drei anodische Peaks. Die ersten beiden entsprechen der Oxidation von Ag und der Bildung einer passivierenden Ag2O-Schicht auf der Elektrodenoberfläche, der dritte einer Umwandlung von Ag2O in AgO. In Gegenwart von ClO4 − wurde eine ausgeprägte Abhängigkeit der Voltammogramme von der Perchloratkonzentration festgestellt. Durch die Anwesenheit von ClO4 − wird die Intensität der drei anodischen Peaks erhöht, und ab einem gewissen Potential bricht die Passivierung unter Eintreten von Lochfraßkorrosion zusammen. Das Lochfraßpotential nimmt linear mit der Konzentration von ClO4 − ab und steigt mit der Scangeschwindigkeit. Die potentiostatischen Strom/Zeit-Diagramme zeigen, daß die Lochfraßkorrosion als diffusionskontrolliertes dreidimensionales Wachstum charakterisiert werden kann.
    Notes: Summary.  The passivation and pitting breakdown of a silver electrode in sodium hydroxide solutions containing sodium perchlorate was studied using potentiodynamic and potentiostatic techniques. In perchlorate-free alkali solution, the voltammogram exhibits three anodic peaks prior to oxygen evolution. The first two peaks correspond to the oxidation of Ag and formation of a passive film of Ag2O on the electrode surface, the third to the conversion of Ag2O to AgO. In the presence of ClO4 −, the voltammogram depends considerably on perchlorate concentration. ClO4 − increases the height of the three anodic peaks, and at potentials above a limiting value breakdown of the anodic passivity and initiation of pitting corrosion occurs. The pitting potential decreases linearly with ClO4 − concentration but increases with scan rate. The potentiostatic current/time transients show that pitting corrosion can be described in terms of an instantaneous three dimensional growth under diffusion control.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/PL00010182
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  • 9
    Electronic Resource
    Electronic Resource
    Effects on Migration of Marine Organisms in the Gulf of Mexico (1970)
    [s.l.] : Nature Publishing Group
    Nature 226 (1970), S. 1155-1156 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THE research vessel Alaminos from Texas A & M University was in the Gulf of Mexico on March 7 to record changes in the near-surface layers of sea and air as a consequence of the eclipse. So that a maximum variation in incident solar radiation could be realized, the observing site was chosen at ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/2261155a0
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  • 10
    Electronic Resource
    Electronic Resource
    Outer membrane proteins in a chloramphenicol-resistant strain ofPseudomonas aeruginosa (1986)
    Springer
    Cellular and molecular life sciences 42 (1986), S. 97-97 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01975956
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