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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Marine biology 5 (1970), S. 136-140 
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Mnierpes macrocephalus (Günther) inhabits the steep, current-swept shores of the tropical east Pacific Ocean; it makes frequent terrestrial excursions. Laboratory and field studies were undertaken to assess the importance of these excursions in its ecology. Several morphological features, such as body shape, padded ventral surfaces, thickened fin rays and incised fin membranes are related to its capacity for terrestrial locomotion. Its body scalation reduces desiccation. M. macrocephalus can endure prolonged exposure to air, apparently by respiring aerially. Its eyes are highly adapted for terrestrial vision through the presence of flattened corneas. Terrestriality appears to play a significant part in the capacity of M. macrocephalus to orientate at the oscillating water surface where it resides.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Marine biology 23 (1973), S. 83-91 
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The physiological adaptations for terrestrial life of the rockskipper Mnierpes macrocephalus (Günther) have been examined and compared with other amphibious species. The rockskipper lives on steep rocky shores in the eastern tropical Pacific Ocean, and makes brief terrestrial excursions for orientation, feeding, and to avoid wave action and predators. The rockskipper spends a large portion of its time, and can live perfectly well, submerged in water. The duration of this species' daytime terrestrial sojourns rarely exceeds 30 min. While on land, the rockskipper respires aerially, through its gills and skin, at the same rate it normally respires in water. When exposed to sunlight without water, the rockskipper's body temperature increases rapidly. A small amount of water, however, enables the rockskipper to remain cool, apparently by dissipating absorbed heat through evaporative cooling of the gills and skin. Evaporative water-loss from respiratory surfaces is a major factor limiting terrestrial excursions of the rockskipper.
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  • 3
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of medicinal chemistry 16 (1973), S. 1272-1276 
    ISSN: 1520-4804
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of medicinal chemistry 17 (1974), S. 930-934 
    ISSN: 1520-4804
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of medicinal chemistry 17 (1974), S. 922-930 
    ISSN: 1520-4804
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 28 (1972), S. 187-192 
    ISSN: 1600-5740
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 246 (1973), S. 291-295 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Major components of the plasma membrane double during interphase. Some minor components also double, but others show fluctuations. Decreased expression by immune cytolysis of H-2 antigenicity during interphase is explicable in terms of decreased membrane fragility. These results are compatible with ...
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  • 8
    ISSN: 1432-0827
    Keywords: Somatotrophin ; Bone ; Hormone
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Description / Table of Contents: Résumé Chez des chiens adultes, des deux sexes, l'injection d'hormone de croissance induit une augmentation marquée d'os nouvellment formé. L'effet sur la résorption n'a pu être définie quantitativement, mais la résorption au niveaude de l'endoste est augmentée. Il en est de même de la résorption intracorticale, mais la porosité intracorticale n'augmente que légèrement. En plus de la décroissance de la résorption de l'endoste, on observe du même côté une nette augmentation de la formation osseuse. Cette apposition osseuse ajoutée à la formation d'os périosté donne uneaugmentation de la masse squelettique. L'os formé est histologiquement et microradiographiquement normal. Malgré une nette augmentation de la formation osseuse, les valeurs de la phosphatase alcaline restent inchangées.
    Abstract: Zusammenfassung Exogenes Wachstumshormon rief bei intakten ausgewachsenen Hunden beiden Geschlechts eine starke Zunahme der Knochenbildung hervor. Die resultierende Wirkung auf die Resorption konnte quantitativ nicht festgestellt werden, jedoch war die endostale Resorption vermindert. Die intracorticale Resorption war erhöht, aber die intracorticale Porosität stieg nur wenig an. Neben der Verminderung der endostalen Resorption war reichliche endostale Knochenneubildung festzustellen. Dieser Anstieg der endostalen Knochenneubildung plus die starke Anregung der periostalen Knochenneubildung führten zu einertatsächlichen Zunahme der Skelettmasse. Der gebildete Knochen war histologisch und mikroradiographisch normal. Trotz der starken Zunahme der Knochenneubildung blieben die Werte der alkalischen Phosphatase unverändert.
    Notes: Abstract In intact adult dogs of both sexes exogenous growth hormone induced a marked increase in new bone formation. The net effect on resorption could not be defined quantitatively but endosteal resorption was decreased. Intracortical resorption was increased but intracortical porosity rose only slightly. In addition to the decrease in endosteal resorption, there was abundant endosteal new bone formation. This rise in endosteal new bone formation plus the marked stimulus to periosteal new bone formation led to anet increase in skeletal mass. The bone formed was normal histologically and microradiographically. Despite a marked rise in new bone formation, alkaline phosphatase values remained unchanged.
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Mathematische Zeitschrift 130 (1973), S. 31-37 
    ISSN: 1432-1823
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Rock mechanics and rock engineering 4 (1972), S. 191-202 
    ISSN: 1434-453X
    Keywords: cracking ; diamond ; drilling ; failure ; friction ; laboratory tests ; rock ; fissuration ; diamant ; perforation ; rupture frottement ; essais de laboratoire ; roche
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geosciences
    Description / Table of Contents: Zusammenfassung Reibungseffekt eines Diamanten — ein Einblick ins Gesteinsbohren Untersuchungen mit optischen Methoden wurden unternommen, um die ersten Stufen des Reibungseffektes eines mit Gewichten belasteten und auf glatten Flächen reibenden Diamanten auszuwerten, und zwar als Funktion der Geschwindigkeit, des Durchmessers, der Belastung und des Schmiermittels. Die Versuche wurden mit verschiedenen homogenen Werkstoffen durchgeführt, wobei neue Arten von Rißbildungen beobachtet werden konnten. Die statistische Variation war von Riß zu Riß, aber auch innerhalb eines einzelnen Risses, so groß, daß quantitative Schlußfolgerungen auf dieser Stufe nicht gezogen werden konnten, doch wurden einige allgemeine Auswirkungen der Variablen aufgedeckt. Die Anwendung der Ergebnisse auf das Gesteinsbohren ist noch nicht zwingend möglich und kann wohl erst nach voller Auswertung und Erweiterung der Untersuchungen erreicht werden.
    Abstract: Résumé Les dégâts produits par un diamant glissant — une approche de la perforation des roches dures Les premières étapes des dégâts occasionnés par un diamant sphérique et chargé se déplaçant sur une surface lisse, en fonction de la vitesse, du rayon, de la charge et de la lubrification pour plusieurs matières homogènes ont été évaluées par des méthodes optiques. De nouveaux types de réseaux de fissures et de traces d'abrasion ont été observés. La variation statistique, de trace en trace, est si grande que des conclusions quantitatives ne sont pas possibles pour le moment quoique les effets généraux des variables soient notés. L'application à la perforation des roches dures n'est pas aisée et devra probablement attendre une évaluation de la quantité de matière enlevée.
    Notes: Summary Damage Induced by a Sliding Diamond — an Approach to Hard Rock Drilling Optical methods were used to evaluate the early stages of damage caused by a loaded spherical diamond moving over a smooth surface, as a function of speed, radius, load and lubrication, for several homogeneous materials. New types of cracking patterns and abraded tracks have been observed. The statistical variation from track to track, and even within one track, is so great that quantitative conclusions are not possible at this stage, although some general effects of the variables are noted. Application to hard rock drilling is not straightforward and will probably have to await an evaluation of material removed.
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