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  • 1990-1994  (1)
  • 1980-1984  (1)
  • Hydra vulgaris
  • Polymer and Materials Science
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Hydrobiologia 216-217 (1991), S. 661-669 
    ISSN: 1573-5117
    Keywords: Hydra vulgaris ; nematocysts ; potassium
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The spatial distribution of cations was assayed qualitatively and quantitatively in tentacular nematocytes of Hydra vulgaris in a scanning transmission electron microscope by means of x-ray microanalysis performed on 100 nm thick freeze-dried cryosections. The matrix of undischarged cysts (stenoteles, desmonemes and isorhizas) was found to contain mainly K+. In isolated nematocysts of Hydra the intracapsular potassium can be readily substituted by practically any other mono- and divalent cation (Na+, NH4 +, Mn2+, Co2+, Mg2+, Ca2+, Fe2+) all, except Fe2+, without impairing the ability of the cyst to respond to the chemical triggering with dithioerythritol or proteases. Monovalent cations increase the osmotically generated intracapsular pressure compared to divalent ions.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 11 (1980), S. 244-258 
    ISSN: 0933-5137
    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: Behaviour of stainless cast alloys under combined mechanical and corrosive attackIn media with 3000 mg B/1 (as boric acid, H3BO3) and varying chloride contents down to 1 mg Cl-/1 13%-Cr-steels show pitting. Under constant load cracks appear simultaneously. As can be expected, 17%-Cr-steels are more resistant and duplex ferritic austenitic steels exhibit no corrosion cracking in 3% NaCl-solution even after 10 000 hrs. Generally, corrosion resistance improves with increasing contents of ferrite forming elements. Corrosion cracks are interpreted in termes of anodic stress corrosion cracking. Notch impact bending tests with hydrogen charged specimens show that deformability is reduced.
    Notes: 13%-Cr-Stähle zeigen in Lösungen mit 3000 mg B/1 (als Borsäure, H3BO3) und unterschiedlichen Chloridgehalten Lochkorrosion bis herab zu Konzentrationen von 1 mg Cl-/1. Bei mechanischer Zugbeanspruchung treten gleichzeitig Risse auf. 17%-Cr-Stähle sind erwartungsgemäß beständiger und ferritisch-austenitische Stähle zeigen in 3% NaCl-Lösung auch im 10 000 h-Versuch keine Korrosionsrisse. Generell steigt die Beständigkeit mit zunehmendem Anteil an ferritbildenden Elementen. Die Korrosionsrisse werden als anodische Spannungsrißkorrosion interpretiert. Kerbschlagbiegeversuche mit wasserstoffbeladenen Proben ergeben eine Abnahme des Verformungsvermögens.
    Additional Material: 21 Ill.
    Type of Medium: Electronic Resource
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