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  • Springer  (18)
  • Springer Nature  (18)
  • International Union of Crystallography (IUCr)
  • American Institute of Physics (AIP)
  • Oxford University Press
  • American Chemical Society (ACS)
  • 1965-1969  (38)
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  • 1
    Publikationsdatum: 1965-01-01
    Print ISSN: 0028-0836
    Digitale ISSN: 1476-4687
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Publiziert von Springer Nature
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 2 (1969), S. 249-252 
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: The practical importance of tungsten monocarbide prompted an investigation into its wear mechanism. Initial studies on ball-milled tungsten carbide powders revealed considerable plastic deformation, coupled with a reduction in crystallite size. Deformation stacking faults, involving slip on the basal plane, were observed. The work was extended to sintered blocks, tool tips and single crystals. Studies on the worn surfaces of these revealed plastic deformation that extended to a depth of a few microns below the surface. The plastic deformation is an important factor in the wear of tungsten carbide.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Springer
    Monatshefte für Mathematik 70 (1966), S. 155-160 
    ISSN: 1436-5081
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Mathematik
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    Springer
    Mathematische Zeitschrift 100 (1967), S. 141-145 
    ISSN: 1432-1823
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Mathematik
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 5
    Digitale Medien
    Digitale Medien
    Springer
    Archiv der Mathematik 19 (1969), S. 615-620 
    ISSN: 1420-8938
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Mathematik
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 6
    Digitale Medien
    Digitale Medien
    Springer
    Journal of thermal analysis and calorimetry 1 (1969), S. 449-458 
    ISSN: 1572-8943
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Beschreibung / Inhaltsverzeichnis: Résumé On décrit une nouvelle méthode à calculer la pureté des substances organiques non polymères à l'aide de la courbe enregistrée sur un “Differential-Scanning Calorimètre”Perkin-Elmer. Au lieu d'utiliser seulement la partie initiale du pic, on se sert du tracé complet. On attribue une valeur numérique définie à la perte d'énergie, précédemment déterminé e par approximations successives. Un seul enregistrement sur le DSC permet d'obtenir des valeurs significatives de la pureté, avec des échantillons à 95–99.9 %. On montre que cette nouvelle méthode fournit des résultats plus exacts et moins ambigus que celle des fabricants
    Kurzfassung: Zusammenfassung Es wird über eine neue Methode zur Ermittlung der Reinheit von organischen, nicht-polymeren Stoffen mit Hilfe einer durch ein Differential-Scanning Calorimeter Perkin-Elmer gezeichneten Kurve berichtet. Die Methode beruht auf der Verwendung der vollen Kurve und gibt für den Energieverlust definitive numerische Werte. Verläßliche Reinheitswerte von Proben von 95 bis zu 99.9 % Reinheit können durch eine einzige Kurve erhalten werden. Die neue Methode gibt sicherere und eindeutigere Ergebnisse als die von den Geräterzeugern vorgeschlagene.
    Notizen: Abstract This paper presents a new method for the calculation of the purity of organic, non-polymeric samples using the recorder trace from a Differential Scanning Calorimeter (DSC), Perkin-Elmer Corp. The entire DSC recorder trace is employed rather than only the initial portion of the curve. The previous trial and error choice of energy lost by the DSC trace has been replaced by a definite numerical value. Meaningful purity values have been obtained from a single DSC trace on samples of from 95 to 99.9% purity. This new method has been demonstrated to provide more accurate and less ambiguous results than the manufacturer's procedure.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 7
    Digitale Medien
    Digitale Medien
    Springer
    Cell & tissue research 100 (1969), S. 1-30 
    ISSN: 1432-0878
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary Morphological aspects of centriole replication as displayed in tracheal epithelial cells of 15 to 19-day-old chick embryos during ciliogenesis were examined by electron microscopy. It was found that centriole replication and development take place in a finely fibrous region around the two mature centrioles of the diplosome. Procentrioles in early stages of development are observed in clusters. The core of each cluster is occupied by one or more cylindrical structures which gradually disappear as the procentrioles mature. Some of the procentriolar clusters are attached directly to the walls of the diplosomal centrioles by the cylindrical cores. This observation suggests that all of the clusters may form initially in close association with the diplosomal centrioles. The earliest recognizable procentrioles are short, cylindrical structures that have no microtubules. Later microtubules appear, first as singlets, then doublets and finally as triplets. The singlet becomes the innermost microtubule of the triplet. Following the assembly of the nine triplets, the procentrioles separate from the clusters, elongate to their mature length and acquire rootlets, ciliary vesicles and cilia. The observation that all the procentrioles in each cell are in the same stage of development indicates that all the centrioles or presumptive basal bodies required by this cell are produced at the same time.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 8
    Digitale Medien
    Digitale Medien
    Springer
    Annali di matematica pura ed applicata 68 (1965), S. 21-29 
    ISSN: 1618-1891
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Mathematik
    Notizen: Summary An explicit formula is found for the number of solutions in a finite field of the system of polynomial equations(11), when the coefficients satisfy certain conditions.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 9
    Digitale Medien
    Digitale Medien
    Springer
    Annali di matematica pura ed applicata 82 (1969), S. 115-120 
    ISSN: 1618-1891
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Mathematik
    Notizen: Summary Explicit formulas are obtained over a finite field for the number of partitions of a skew matrix B into various forms: for example, B=X′AY′−XA′Y.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 10
    Digitale Medien
    Digitale Medien
    Springer
    Protoplasma 61 (1966), S. 322-345 
    ISSN: 1615-6102
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary The dermal melanophores ofFundulus heteroclitus L. have been investigated by light and electron microscopy with the purpose of revealing the mechanisms controlling pigment migration. As predicted by earlier studies, the nerve endings of a double innervation were found adjacent to and in synaptic relation to the melanophore surface. Not expected were the large number of small pits or invaginations present in the cell surface. These appear identical to the so-called micropinocytotic vesicles found generally in cells of the vascular endothalium and smooth muscle. In chromatophores they are more reasonably interpreted as receptor sites for neurohormones than as uptake and transport mechanisms. Observations made on the kinetics of pigment migration within the processes of these melanophores indicate that the granules move along relatively fixed channels arranged parallel to the long axes of the processes. Examined at fine structure levels, the zones of cytoplasm around these channels are found to be populated by microtubules about 225 Å in diameter aligned parallel to the direction of pigment movement. These long slender elements are present in the processes regardless of whether the melanin is concentrated in the cell center or dispersed. It is reasoned from these and other observations that the microtubules function as cytoskeletal elements which help maintain the extended form of the melanophore arms and at the same time define the channels in which the pigment moves. The possible role of the tubule in generating the motive force for pigment migration is discussed.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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