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  • 1
    Electronic Resource
    Electronic Resource
    Pendeoepitaxy of gallium nitride thin films (1999)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 75 (1999), S. 196-198 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Pendeoepitaxy, a form of selective lateral growth of GaN thin films has been developed using GaN/AlN/6H–SiC(0001) substrates and produced by organometallic vapor phase epitaxy. Selective lateral growth is forced to initiate from the (112¯0) GaN sidewalls of etched GaN seed forms by incorporating a silicon nitride seed mask and employing the SiC substrate as a pseudomask. Coalescence over and between the seed forms was achieved. Transmission electron microscopy revealed that all vertically threading defects stemming from the GaN/AlN and AlN/SiC interfaces are contained within the seed forms and a substantial reduction in the dislocation density of the laterally grown GaN. Atomic force microscopy analysis of the (112¯0) face of discrete pendeoepitaxial structures revealed a root mean square roughness of 0.98 Å. The pendeoepitaxial layer photoluminescence band edge emission peak was observed to be 3.454 eV and is blueshifted by 12 meV as compared to the GaN seed layer. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.124317
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  • 2
    Electronic Resource
    Electronic Resource
    MEASUREMENT OF PHOTOGRAPHIC QUALITY AND INDIVIDUAL DISTINCTIVENESS FOR THE PHOTOGRAPHIC IDENTIFICATION OF HUMPBACK WHALES, MEGAPTERA NOVAEANGLIAE (2000)
    Oxford, UK : Blackwell Publishing Ltd
    Marine mammal science 16 (2000), S. 0 
    Details
    ISSN: 1748-7692
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Accurate identification of humpback whales from photographic identification data depends on the quality of the photographs and the distinctiveness of the flukes. Criteria for evaluating photographic quality and individual distinctiveness were developed involving judgments about overall quality or distinctiveness and about specific aspects of each. These criteria were tested for the level of agreement among judges. The distinctiveness scheme was tested for the independence of distinctiveness judgments and photographic quality. Our results show that judges could agree when evaluating specific and overall aspects of photographic quality and individual distinctiveness. The level of agreement varied for different pairs of judges, and less adept judges were identified. Ability to agree on evaluations of photographic quality was independent of the experience of the judges. Overall photographic quality and overall distinctiveness were successfully predicted from more specific variables, but the agreement between judges for these was not significantly greater than the agreement for the overall measures judged directly. There was no correlation between individual distinctiveness and photographic quality for four of the five judges, but the power of this rest may be low. Analyses of photographic identification data frequently require evaluations of photographic quality and individual distinctiveness. To obtain reliable results from such analyses, evaluation schemes and judges should be tested to ensure reliable and consistent evaluations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1748-7692.2000.tb00930.x
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  • 3
    Electronic Resource
    Electronic Resource
    SUBSISTENCE AGRICULTURE AND NUTRITION IN THE BIMIN VALLEY, OKSAPMIN SUB-DISTRICT, PAPUA NEW GUINEA (1985)
    Oxford, UK : Blackwell Publishing Ltd
    Singapore journal of tropical geography 6 (1985), S. 0 
    Details
    ISSN: 1467-9493
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geography
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1467-9493.1985.tb00164.x
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  • 4
    Electronic Resource
    Electronic Resource
    A HAND-HELD, PEN-BASED COMPUTER SYSTEM FOIR MARINE MAMMAL SIGHTING SURVEYS (1997)
    Oxford, UK : Blackwell Publishing Ltd
    Marine mammal science 13 (1997), S. 0 
    Details
    ISSN: 1748-7692
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1748-7692.1997.tb00092.x
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  • 5
    Electronic Resource
    Electronic Resource
    HISTORICAL OBSERVATIONS OF HUMPBACK AND BLUE WHALES IN THE NORTH ATLANTIC OCEAN: CLUES TO MIGRATORY ROUTES AND POSSIBLY ADDITIONAL FEEDING GROUNDS (2004)
    Oxford, UK : Blackwell Publishing Ltd
    Marine mammal science 20 (2004), S. 0 
    Details
    ISSN: 1748-7692
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The seasonal distributions of humpback and blue whales (Megaptera novaeangliae and Balaenoptera musculus, respectively) in the North Atlantic Ocean are not fully understood. Although humpbacks have been studied intensively in nearshore or coastal feeding and breeding areas, their migratory movements between these areas have been largely inferred. Blue whales have only been studied intensively along the north shore of the Gulf of St. Lawrence, and their seasonal occurrence and movements elsewhere in the North Atlantic are poorly known. We investigated the historical seasonal distributions of these two species using sighting and catch data extracted from American 18th and 19th century whaling logbooks. These data suggest that humpback whales migrated seasonally from low-latitude calving/ breeding grounds over a protracted period, and that some of them traveled far offshore rather than following coastal routes. Also, at least some humpbacks apparently fed early in the summer west of the Mid-Atlantic Ridge, well south of their known present-day feeding grounds. In assessing the present status of the North Atlantic humpback population, it will be important to determine whether such offshore feeding does in fact occur. Blue whales were present across the southern half of the North Atlantic during the autumn and winter months, and farther north in spring and summer, but we had too few data points to support inferences about these whales' migratory timing and routes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1748-7692.2004.tb01192.x
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  • 6
    Electronic Resource
    Electronic Resource
    Genetic tagging of humpback whales (1997)
    [s.l.] : Macmillan Magazines Ltd.
    Nature 388 (1997), S. 767-769 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The ability to recognize individual animals has substantially increased our knowledge of the biology and behaviour of many taxa. However, not all species lend themselves to this approach, either because of insufficient phenotypic variation or because tag attachment is not feasible. The use of ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/388767a0
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  • 7
    Electronic Resource
    Electronic Resource
    Some remarks on the analysis of short tidal records (1983)
    Springer
    Ocean dynamics 36 (1983), S. 45-59 
    Details
    ISSN: 1616-7228
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Description / Table of Contents: Zusammenfassung Die Fehler bei der Analyse kurzer Reihen von Gezeitenbeobachtungen werden anhand von synthetischen Wasserständen und gemessenen Strömen untersucht. Als Fehlerquellen erwiesen sich Rauschen, unberücksichtigte Tiden und Beobachtungsdauer. Die Beobachtungsdauer hat den größten Anteil am Gesamtfehler. Aus der Analyse einer synthetischen Reihe konnte abgeschätzt werden, wie sich der Fehler der M2-Tide mit der Beobachtungsdauer ändert. Hiermit lassen sich Fehler bei der Analyse von gemessenen Strömen vorhersagen. Außerdem wird ein Verfahren über die Trennung der M2-und der S2-Tiden aus Beobachtungsreihen von 36 Stunden oder weniger vorgelegt.
    Abstract: Résumé On a examiné les erreurs inhérentes à l'analyse harmonique d'observations de marée de courte durée en utilisant des hauteurs synthétiques et des observations réelles de vitesse du courant. Les causes d'erreurs ont été identifiées comme étant: la présence du bruit, des composantes harmoniques non incluses dans l'analyse, et la durée des observations. De toutes ces causes, il s'est avéré que c'est la durée des observations qui a la plus grande part dans l'erreur totale. En analysant des données de marée synthétiques, on a estimé empiriquement la variation de l'erreur sur la composante M2 en fonction de la durée. C'est cette estimation qui est alors utilisée pour prédire les erreurs dans l'analyse d'observations réelles de courant. Une méthode de séparation des ondes M2 et S2 dans des observations de durée inférieure ou égale à 36 heures est également présentée.
    Notes: Summary The errors inherent in the harmonic analysis of short tidal records have been investigated using synthetic elevation and real velocity records. The sources of error were identified as the presence of noise, tidal constituents not included in the analysis, and the duration of the record. Of these sources, the record duration was shown to be the greatest contributor to the total error. By analysing a synthetic tidal record an empirical estimate of the variation of the error in the M2 component with record length is obtained. This is then shown to predict the errors in the analysis of an actual velocity record. A method is also presented for separating the M2 and S2 constituents in records of 36 hours duration or less.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02313284
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  • 8
    Electronic Resource
    Electronic Resource
    Characterisation of Lectin Binding Patterns of Mouse Bronchiolar and Rat Alveolar Epithelial Cells in Culture (2000)
    Springer
    Journal of molecular histology 32 (2000), S. 33-40 
    Details
    ISSN: 1573-6865
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Lung epithelial cell differentiation pathways remain unclear. This is due in part to the plasticity of these cells and the lack of markers which accurately reflect their differentiation status. The aim of this study was to determine if lectin binding properties are useful determinants of functional differentiation status in vitro. Mouse Clara cells were cultured for 5 days. During this time, no alteration in differentiation was evident by electron microscopy. No significant alteration in binding reactivity of Bauhinia purpurea (BPA), Maclura pomifera (MPA), Concanavalin A, Wheat germ or Helix pomatia lectins occurred in cultures compared with Clara cells in mouse lung tissue. In contrast, nitrotetrazolium blue reductase activity and CC10 expression declined in culture. Rat type II cells were cultured for 8 days. Between days 0 and 4, the number of type II cells identified by electron microscopy was constant at 70–80%, decreasing to 8% by day 6. In contrast, by day 4, only 42% cells retained alkaline phosphatase activity. BPA and MPA reactivity was altered at day 0 and day 4 respectively, compared with cells in situ. Therefore, the reactivity of lectins analysed here does not reflect functional differentiation status of cultured mouse Clara cells. However, BPA and MPA reactivity may be a sensitive indicator of alterations in rat type II cell differentiation in vitro.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003906328438
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  • 9
    Electronic Resource
    Electronic Resource
    Constraints on population growth: The case of the Polynesian Outlier Atolls in the precontact period (1974)
    Springer
    Human ecology 2 (1974), S. 259-295 
    Details
    ISSN: 1572-9915
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Energy, Environment Protection, Nuclear Power Engineering , Ethnic Sciences
    Notes: Abstract A model of the subsistence economy of an insular population is proposed in which the various factors that might influence the potential carrying capacity of the environment are made explicit as a set of ecological and cultural constraints on subsistence production. The application of the model to the Polynesian Outlier Atolls is discussed, and a formula is suggested whereby the population potential of any stable and bounded ecosystem can be calculated, using data on agricultural area, productivity, and diets. The actual size of precontact populations of the Outliers and other atolls appears to have been 70–80% of the predicted carrying capacity, which accords well with ethnographic evidence for population homeostasis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01531318
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  • 10
    Electronic Resource
    Electronic Resource
    Book reviews (1977)
    Springer
    Human ecology 5 (1977), S. 77-96 
    Details
    ISSN: 1572-9915
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Energy, Environment Protection, Nuclear Power Engineering , Ethnic Sciences
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01880261
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