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  • 1
    Electronic Resource
    Electronic Resource
    The meiotic pairing of nine wheat chromosomes (1984)
    Springer
    Theoretical and applied genetics 69 (1984), S. 193-198 
    Details
    ISSN: 1432-2242
    Keywords: C-banding ; Heterochromatin ; Meiosis ; Common wheat ; Triticum aestivum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The meiotic identification of nine pairs of chromosomes at metaphase I of meiosis of Triticum aestivum (B genome, 4A and 7A) has been achieved using a Giemsa C-banding technique. As a result, the analysis of the pairing of each chromosome arm in disomic and monosomic intervarietal hybrids between ‘Chinese Spring’ and the Spanish cultivar ‘Pané 247’ could be carried out. Differences in the chiasmata frequencies per chromosome arm cannot be explained on the basis of relative arm lengths only. Possible effects of arm-to-arm heterochromatic differences on meiotic pairing are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00272894
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  • 2
    Electronic Resource
    Electronic Resource
    Meiotic pairing of the amphiploid Hordeum chilense X Triticum turgidum conv. durum studied by means of Giemsa C-banding technique (1985)
    Springer
    Theoretical and applied genetics 70 (1985), S. 85-91 
    Details
    ISSN: 1432-2242
    Keywords: Heterochromatin ; Hordeum chilense ; Tritordeum ; C-banding ; Meiosis ; Triticum ; Amphiploid
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The meiotic behaviour of the amphiploid Hordeum chilense X Triticum turgidum conv. durum using a C-banding staining method is studied. Nine pairs of chromosomes at metaphase-1 (4A, 7A and the seven of the B genome) were identified and the remaining wheat chromosomes (1A, 2A, 3A, 5A and 6A) and seven of the chilense (1 to 7 H ch chromosomes) were assigned to its particular genome. A similar mean number of univalents from parental genomes (wheat and wild barley) were found. No meiotic pairing between chilense and turgidum chromosomes was detected. Differences in the meiotic behaviour per chromosome and amongst genomes are explained on the basis of cytomorphological and heterochromatin characteristics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00264487
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  • 3
    Electronic Resource
    Electronic Resource
    Poly(tetrachloro-p-phenyleneselenide) synthesis (1987)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 25 (1987), S. 1449-1450 
    Details
    ISSN: 0887-624X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1987.080250521
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  • 4
    Electronic Resource
    Electronic Resource
    Teoría y prática de la lucha contra la corrosion (Theory and practice of the fight against corrosion). Edited by Dr. J. A. González. Published by Consejo Superior de Investigaciones Científicas, Madrid 1984. ISBN 84-00-05670-1. 683 pp., 74 tables, 237 figs. 3,000 pesetas (20 US-$). Available from: Publications Service of C.S.I.C., Vitruvio, 8, E-28006 Madrid (1985)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 36 (1985), S. 139-139 
    Details
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19850360309
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  • 5
    Electronic Resource
    Electronic Resource
    Application of the Polarization Resistance Method to the Study of Lead Corrosion in Sulphuric Acid (1975)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 26 (1975), S. 758-764 
    Details
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Anwendung der Polarisationswiderstands-methode zur Untersuchung der Korrosion von Blei in SchwefelsäureDie Geschwindigkeit der Korrosion und ihre zeitliche Entwicklung wurden an Bleilegierungen in konzentrierter heißer Schwefelsäure mittels Polarisationswiderstandsmessungen untersucht. Bei den Legierungen mit Fähigkeit zu Selbstpassivierung und Aufrechterhaltung des passiven Zustandes unter den Versuchsbedingungen ist es möglich. aufgrund der elektrochemischen Meßwerte genaue Angaben über die zu erwartende Korrosion zu machen. Andererseits gibt es spezifische Probleme bei den Bleilegierungen, deren Korrosionspotential alterierend zwischen Aktiv- und Passivzustand wechselt. Trotzdem ist es bei gewissen Modifizierungen der Methode moglich, die Polarisations-widerstandsmessung auch unter diesen Bedingungen einzusetzen, wobei natürlich die Genauigkeit geringer ist als im Falle der Legierungen mit stabiler Passivität. Aufgrund der Versuchsergebnisse definieren die Autoren verschiedene Mechanismen für die Korrosion der Bleilegierungen in Schwefelsäure.
    Notes: The corrosion rates and their evolution with time of lead alloys in hot-concentrated sulphuric acid have been evaluated through polarization resistance measurements. For the case of alloys capable of being self-passivated and of retaining the passive state under the exposure conditions, accurate corrosion rates can be predicted from the electrochemical data. On the other hand, some special problems are associated with the application of the polarization method to lead alloys with exhibit alternating changes of corrosion potential between an active and a passive state. Nevertheless, the method, with some slight modifications, continues to be effective for determining corrosion rates although to a lesser degree of accuracy than with stable alloys. On the basis of the results obtained, the different mechanisms of lead alloy corrosion in sulphuric acid are outlined.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19750261003
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  • 6
    Electronic Resource
    Electronic Resource
    Oxidation der Pb-Ca-Legierungen in flüssigem Zustand (1978)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 29 (1978), S. 815-820 
    Details
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Oxidation of PbCa alloys in the liquid stateThe effect of various temperatures, the composition of the alloy and the corroding atmosphere is studied with a thermobalance during the oxidation of molten PbCa alloys. The rate controlling step of the oxidation depends on the test conditions. The results obtained at 700°C are in agreement with data found in literature and according to which the oxidation increases with the Ca content; in this range calcium is subject to preferential oxidation. At 600°C and temperatures below that the addition of calcium does not only not increase oxidation but may give rise to a decrease.
    Notes: Mit einer Thermowaage wird die Wirkung verschiedener Temperaturen, der Zusammensetzung der Legierung und der Zusammensetzung der angreifenden Atmosphäre bei der Oxidation geschmolzener Pb-Ca-Legierungen untersucht. Der geschwindigkeitsbestimmende Schritt der Oxidation hängt von den Versuchsbedingungen ab. Bei 700°C bestätigen die bei der vorliegenden Untersuchung erhaltenen Ergebnisse die Literaturangaben, wonach die Oxidation bei zunehmendem Ca-Gehalt ansteigt; dabei wird das Calcium vorzugsweise oxidiert. Dagegen wird bei 600°C und darunter die Oxidation durch Zusatz von Calcium nicht nur nicht verstärkt, sondern sogar verringert.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19780291206
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  • 7
    Electronic Resource
    Electronic Resource
    The repassivation capacity of Stainless steel-ceramic prostheses (1988)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 39 (1988), S. 364-369 
    Details
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Repassivierungsfähigkeit von keramikbeschichteten EdelstahlprothesenDas Durchbruchs- und das Repassivierungspotential von keramikbeschichteten Prothesen aus nicht rostendem Stahl sind in Hanks-Lösung und an Implantaten an Hunden bestimmt worden. Diese Werkstoffe zeigen geringe Lochkorrosionsempfindlichkeit und starke Repassivierungsfähigkeit. Der Einfluß von Oberflächenrauhigkeit, Tauchzeit und der Homogenisierungsbehandlung auf das Lochfraßverhalten wird diskutiert.
    Notes: The breakdown and repassivation potentials of stainless steel-ceramic prostheses have been determined both in a Hanks' solution and in implants in dogs. These materials show low susceptibility to pitting corrosion as well as a high repassivation capability. The influence of surface roughness, exposure time and homogenization treatment on the pitting corrosion behaviour is studied.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19880390803
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  • 8
    Electronic Resource
    Electronic Resource
    Reliability of electrochemical methods applied to the study of Alumina coated stainless steel prosthesis (1986)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 37 (1986), S. 451-456 
    Details
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Zuverlässigkeit elektrochemischer Methoden bei der Untersuchung von Prothesen aus nichtrostendem Stahl mit AluminiumoxidüberzugIm vorliegenden Bericht wird die Korrosionsbeständigkeit von Prothesen aus nichtrostendem Stahl mit Aluminiumoxidüberzug erörtert; als Versuchsmaterial dienten Stahl AISI 316 L mit plasmagespritztem Aluminiumoxidüberzug (mit und ohne Nickel als Zwischenschicht).Die Nickelschicht soll die Haftung zwischen dem keramischen Material und dem Stahl gewährleisten. Als Prüfmedium diente die Hank'sche Lösung, da diese Ähnlichkeit mit organischen Flüssigkeiten aufweist. Zur Verbesserung der Aussagefähigkeit der Ergebnisse wird empfohlen, mehrere der nachstehenden elektrochemischen Methoden nebeneinander zu verwenden: Bestimmung der Zeitabhängigkeit des Korrosionspotentials; Polarisationswiderstandsmessung; coulostatische Methoden und Wechselstrommethoden. Bei der elektrochemischen Untersuchung von keramikbeschichtetem nichtrostendem Stahl im passiven Zustand ergeben sich einige spezifische Schwierigkeiten durch die Störung der Arbeitselektrode infolge der einwirkenden elektrischen Signale, wodurch die Genauigkeit der Korrosionsgeschwindigkeitsmessung beeinträchtigt wird. Diese Schwierigkeiten treten nicht auf, wenn eine Kombination mit einer aktiveren Zwischenschicht benutzt wird.
    Notes: The corrosion resistance of alumina-covered stainless steel prosthesis is discussed in this report. The test material was an AISI 316L steel with a plasma sprayed on alumina coating, applied directly or through an intermediate nickel base layer, whose mission is to guarantee a perfect adherence between the ceramic material and the steel. Use was made in the laboratory of Hank's solution as test medium since this solution is similar to organic fluids. In order to increase the reliability of the results the simultaneous use of various of the following electrochemical methods are recommended: Determination of corrosion potential with the time, polarization resistance method, coulostatic method and a.c. methods. The use of electrochemical methods to study ceramic-covered stainless steel in the passive state poses some specific difficulties accruing from the disturbance of the working electrode by the applied electrical signals which limit the accuracy of the corrosion rate measurements. These difficulties do not appear in the case of a material having a intermediate layer which is more active.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19860370805
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  • 9
    Electronic Resource
    Electronic Resource
    Effect of grid cast structure on the anodic corrosion of lead (1972)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 23 (1972), S. 554-561 
    Details
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Einfluß der Gußstruktur der Gitter auf die anodische Korrosion des BleisDer Einfluß der Gußstruktur auf das Ausmaß des anodischen Angriffs ist an sechs Legierungen auf Bleibasis untersucht worden. Ein Vergleich der Gewichtsverluste einer Reihe von Platten, die jeweils in zwei deutlich unterschiedenen Gußgefügen untersucht wurden (fein- und grobkörnig) zeigt, daß die Struktur die Korrosion häufig sehr stark beeinflußt. Die Richtung dieses Einflusses ist abhängig von der Art der jeweiligen Legierung. In manchen Fällen ist der Angriff bei grobkörniger Metallstruktur stärker, während in anderen Fällen der gegenteilige Effekt beobachtet wird. Abschließend wird eine theoretische Deutung der wichtigsten beobachteten Tatsachen gegeben. Diese Deutung beruht auf einer Analyse der Möglichkeiten eines selektiven Angriffs des Metalls und der Zerstörung von Gefügeeinheiten.
    Notes: The influence of cast structure on the magnitude of the anodic attack has been studied for six lead base materials.A comparison of the losses of weight of series of grid samples corresponding to the testing of two well differentiated cast structures for each material (a “coarse” structure and a “fine” one) shows that there is often a significant influence of the structure on the corrosion. The direction of the effect depends on the type of alloy tested. In some cases the “coarse” structure motivates a higher attack than the “fine” structure; in other cases, the opposite effect is encountered.Finally, a theoretical justification is given of the principal facts observed. This is chiefly based on an analysis of the possibilities of selective attack of the material and disintegration of structural units.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19720230705
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  • 10
    Electronic Resource
    Electronic Resource
    Determination of the instantaneous rate of atmospheric corrosion (1978)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 29 (1978), S. 456-460 
    Details
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Bestimmung der momentanen Geschwindigkeit der atmosphärischen KorrosionEs wurde versucht, die Anwendbarkeit der Methode von Stern (Polarisationswiderstand) zur Ermittlung der momentanen atmosphärischen Korrosion zu bestimmen. Die bisher ausgeführten Untersuchungen zeigen gute Übereinstimmung zwischen den elektrochemisch ermittelten Daten über den Einfluß verschiedener Korrosionsfaktoren und der tatsächlichen Wirkung dieser Faktoren auf den Angriff von Metallen bei Bewitterung.
    Notes: An attempt has been made to determine the applicability of Stern's (or polarisation resistance) method for obtaining a reliable evaluation of the instantaneous rate of atmospheric corrosion.The tests carried out so far have revealed a good agreement between electrochemically obtained information on the influence of various corrosion factors and their real effect on the attack of metals when exposed to the atmosphere.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19780290705
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