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  • Nature Publishing Group  (13)
  • American Association of Petroleum Geologists (AAPG)  (1)
  • 1
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    Improved geostatistical models of inclined heterolithic strata for McMurray Formation, Alberta, Canada (2013)
    American Association of Petroleum Geologists (AAPG)
    Details
    Publication Date: 2013-07-03
    Description: The McMurray Formation of northern Alberta in Canada contains multiscale complex geologic features that were partially formed in a fluvial-estuarine depositional environment. The inclined heterolithic strata deposited as part of fluvial point bars contain continuous centimeter-scale features that are important for flow characterization of steam-assisted gravity drainage processes. These channels are common, extensive, and imbricated over many square kilometers. Modeling the detailed facies in such depositional systems requires a methodology that reflects heterogeneity over many scales. This article presents an object-based facies modeling technique that (1) reproduces the geometry of multiscale geologic architectural elements seen in the McMurray Formation outcrops and (2) provides a grid-free framework that models these geologic objects without relating them to a grid system. The grid-free object-based modeling can be applied to any depositional environment and allows for the complete preservation of architectural information for consistent application to any gridding scheme, local grid refinements, downscaling, upscaling, drape surface, locally variable azimuths, property trend modeling, and flexible model interaction and manipulation. Features millimeters thick or kilometers in extent are represented very efficiently in the same model.
    Print ISSN: 0149-1423
    Electronic ISSN: 0149-1423
    Topics: Geosciences
    Published by American Association of Petroleum Geologists (AAPG)
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  • 2
    Electronic Resource
    Electronic Resource
    Bombesin—satiety or malaise? (1980)
    [s.l.] : Nature Publishing Group
    Nature 285 (1980), S. 592-592 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] IT has recently been claimed by Gibbs et al.1 that bombesin (BBS), like cholecystokinin (CCK), produces satiety in rats. However, their report ignores crucial evidence and lacks critical controls. First, there is good evidence that CCK suppresses feeding because it produces malaise. This has been ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/285592a0
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  • 3
    Electronic Resource
    Electronic Resource
    Cholecystokinin produces bait shyness in rats (1977)
    [s.l.] : Nature Publishing Group
    Nature 266 (1977), S. 196-196 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] BECAUSE an injection of cholecystokinin (CCK) (or of the synthetic C-terminal octapeptide of CCK1) reduces food intake in the fasted rat, it has been suggested by Gibbs, Smith and colleagues2,6 that CCK may be a satiety signal. We present here evidence against this conclusion. To quote from ref 4, ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/266196a0
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  • 4
    Electronic Resource
    Electronic Resource
    Facilitation as a Function of Temporal Spacing of Stimuli in Intracranial Self-stimulation (1965)
    [s.l.] : Nature Publishing Group
    Nature 208 (1965), S. 592-593 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] In the experiment to be reported here, the time between two successive trains of electrically rewarding stimuli was varied to assess the effects of temporal spacing between them on a threshold of lever pressing. The subjects were three male albino rats of the Sprague-Dawley strain, weighing about ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/208592a0
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  • 5
    Electronic Resource
    Electronic Resource
    Threshold Differentiation of Drive and Reward in the Olds Effect (1962)
    [s.l.] : Nature Publishing Group
    Nature 196 (1962), S. 699-700 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Fig. 1. Hesults of preliminary experiment on one animal. Crosses show the number of lever presses to extinction in successive 30-sec periods of normal extinction. Circles represent the number of lever presses in 30 sec of extinction during which a low intensity of repetitive stimulation was given, ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/196699a0
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  • 6
    Electronic Resource
    Electronic Resource
    Nature of the Vibrato and the Control Loop in Singing (1959)
    [s.l.] : Nature Publishing Group
    Nature 183 (1959), S. 167-168 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] ANY attempt to analyse the control mechanisms in the human operator is greatly facilitated if we can control all the information which is fed from the output back into the input. But whereas in most skills proprioception, which is resistant to such control, is of importance, in singing the role of ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/183167a0
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  • 7
    Electronic Resource
    Electronic Resource
    Rotational Analysis of Absorption Bands of Lead Monoxide (1961)
    [s.l.] : Nature Publishing Group
    Nature 191 (1961), S. 374-375 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] This comparatively simple situation, which obtains for the lighter molecules of the group, is in strong contrast with that for the heavier molecules, particularly for SnSe, SnTe and the lead compounds. In PbO, for example, the absorption region of longer wave-length (〉 2500 Å.) shows at least ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/191374b0
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  • 8
    Electronic Resource
    Electronic Resource
    Counter-injection: a New Technique for the Analysis of Drinking (1962)
    [s.l.] : Nature Publishing Group
    Nature 196 (1962), S. 196-197 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Briefly, the technique described here is to inject into the stomach by way of a chronically implanted fistula small quantities of fluid (such as hyper tonic saline) in proportion as the animal itself drinks, say, water. In this way, the tonicity of the fluid arriving in the animal's stomach can be ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/196196a0
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  • 9
    Electronic Resource
    Electronic Resource
    The Plexiform Zone and Shape Recognition in the Octopus (1960)
    [s.l.] : Nature Publishing Group
    Nature 185 (1960), S. 443-446 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] IT is the purpose of this article to suggest a possible structural basis for shape recognition in the octopus. The octopus is now the best-investigated animal in respect of its discrimination of visual shape, and this is chiefly due to the work of N. S. Sutherland. This author has also put forward ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/185443a0
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  • 10
    Electronic Resource
    Electronic Resource
    Theories of Shape Discrimination in Octopus (1960)
    [s.l.] : Nature Publishing Group
    Nature 188 (1960), S. 1090-1092 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SUTHERLAND, in a recent article1, offers an evaluation of my theory of the relation of the plexiform zone in the octopus to its shape discriminatory capacity2. A critique is made both on general grounds of plausibility and in relation to specific points of experimental evidence. Dr. Sutherland ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/1881090a0
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