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  • crystal structure
  • evolution
  • oxidation
  • porous silicon
  • Springer  (18)
  • 2000-2004
  • 1980-1984  (18)
  • 1984  (18)
Collection
Keywords
Publisher
Years
  • 2000-2004
  • 1980-1984  (18)
Year
  • 1
    Electronic Resource
    Electronic Resource
    Estrogens in insects (1984)
    Springer
    Cellular and molecular life sciences 40 (1984), S. 942-944 
    Details
    ISSN: 1420-9071
    Keywords: Insect hormones ; estradiol ; estriol ; evolution ; sex hormones
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Insects representing 5 different orders contain androgen and estrogen-like substances as determined by radioimmunoassay. Estradiol and estriol have been identified by gas chromatography-mass spectrometry. The presence of these steroids in insects suggests that the vertebrate sex hormones have an ancient evolutionary history.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01946450
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  • 2
    Electronic Resource
    Electronic Resource
    Influence of chromium on the oxidation of titanium between 550° and 700°C (1984)
    Springer
    Oxidation of metals 21 (1984), S. 205-231 
    Details
    ISSN: 1573-4889
    Keywords: oxidation ; titanium ; chromium ; adherence
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The oxidation behavior of Ti-Cr alloys (1, 4, 11, and 19% chromium by weight) was investigated, between 550 and 700°C, in air and in oxygen, for a maximum duration of about 800 hr. The kinetics results revealed a significant influence of the chromium content with a maximum, in the unfavorable sense, around 4%. Moreover, the analysis of kinetics curves showed that stable rate constants could be obtained only if the duration of oxidation was sufficiently long. The oxide layers were duplex with a much higher chromium content in the inner layer. The morphological investigations performed on cross-sections of the oxidized specimens showed that the chromium modifies the crystallization of the oxide layers. The adherence of the oxide layers evolves nonmonotonically as a function of chromium content for the same degree of progression of the reaction and as a function of the oxidation rate, which is itself dependent on chromium content.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00741471
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  • 3
    Electronic Resource
    Electronic Resource
    Behavior of Galvalume coated sheet steel at elevated temperatures in O2 and O2/H2O atmospheres (1984)
    Springer
    Oxidation of metals 21 (1984), S. 285-297 
    Details
    ISSN: 1573-4889
    Keywords: Galvalume ; elevated temperature ; intermetallic formation ; Al13Fe4 ; oxidation ; vaporization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Galvalume (trademark of Bethlehem Steel Corp.) sheet steel samples were heated in pure oxygen and 97% O2/3% H2O atmospheres at temperatures ranging from 300 to 670°C. Time at a particular temperature was varied but did not exceed 48 hr. Above 480°C, the Galvalume coating became rapidly alloyed with iron to form Al13Fe4, and zinc was lost by vaporization. The Zn content dropped to about 15 wt%. The time required to fully alloy the overlay at 490°C was less than 4 hr. Below 480°C, only minor microstructural changes occurred, and coating integrity was maintained. No differences in behavior were observed by the addition of 3% water vapor to the gas stream.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00656837
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  • 4
    Electronic Resource
    Electronic Resource
    On the role of peroxisomes in the metabolism of lipids — evidence from studies on mammalian tissues in vivo (1984)
    Springer
    Molecular and cellular biochemistry 65 (1984), S. 23-35 
    Details
    ISSN: 1573-4919
    Keywords: fatty acids ; lipids ; metabolism ; oxidation ; peroxisomes ; regulation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Summary Recent investigations into the role of peroxisomes in mammalian lipid metabolism have employed double isotope methodologies to examine the influence of peroxisomal agents on lipid turnover in the liver and extra hepatic tissues of the living animal. The action of these agents, all of which caused extensive changes in the flux of lipid metabolism in the treated animals, may best be viewed in relation to their effects on the common pathway of fatty acid oxidation in peroxisomes. Clofibrate, for example, acts through induction of peroxisomal oxidases and catalase; glycolate and ethanol through activation of this pathway; and aminotriazole and allylisopropylacetamide through inhibition of the catalase step in the sequence. The data from these studies provide support for the concept of an important contributory and regulatory role of peroxisomes in relation to the overall balance of lipid metabolism, and emphasize that these organelles play a significant role in the oxidation of common fatty acids, as well as a potential for the elimination of fatty acids that are poorly oxidized by mitochondria. Additionally, the data raise intriguing questions on the extension of peroxisomal influence to include phospholipid metabolism and the substantial degree of inter-tissue communication which is involved in the balance of lipid metabolism in the whole animal.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00226016
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  • 5
    Electronic Resource
    Electronic Resource
    On the influence of cold work on the oxidation behavior of some austenitic stainless steels: High temperature oxidation (1984)
    Springer
    Oxidation of metals 21 (1984), S. 271-284 
    Details
    ISSN: 1573-4889
    Keywords: oxidation ; stainless steel ; cold work
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract AISI 304, 314, 321, and Incoloy 800H have been subjected to several pretreatments: polishing, milling, grinding, and cold drawing. In the temperature range 800–1400 K, cold work improves the oxidation resistance of AISI 304 and 321 slightly, but has a relatively small negative effect on the oxidation resistance of AISI 314 and Incoloy 800H. Milling results in an enlargement of the surface area with a factor 2.5.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00656836
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  • 6
    Electronic Resource
    Electronic Resource
    Platinum and the oxidation behavior of a nickel based superalloy (1984)
    Springer
    Oxidation of metals 22 (1984), S. 201-226 
    Details
    ISSN: 1573-4889
    Keywords: platinum ; nickel-based superalloy ; oxidation ; RJM2012, IN792+Hf
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The oxidation behavior in air of a platinum containing nickel based superalloy (RJM2012) is compared with that of a similar alloy (IN792+Hf) without platinum. The distinct improvement in the oxidation resistance of the platinum containing alloy at high temperatures (1100°C) is explained in terms of the oxide morphologies and oxidation kinetics. In particular, it appears that platinum has a small but significant effect on the diffusion of other species in the alloy, and a model is presented to account for the complex sequence of oxide development, which culminates in the formation of a protective alumina scale.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00656576
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  • 7
    Electronic Resource
    Electronic Resource
    The ratios of layer thicknesses in a multiphase oxide scale (1984)
    Springer
    Oxidation of metals 22 (1984), S. 35-43 
    Details
    ISSN: 1573-4889
    Keywords: oxidation ; multiphase oxides ; steam ; 9Cr steel ; hematite
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The diffusion controlled oxidation of a metal to produce two-layer oxides and one type of three-layer oxide is analyzed. It is proved that the relative thicknesses of the oxide layers must tend to a limiting constant value for all oxidizing conditions. The analysis for the three-layer oxide is applied to the oxidation of 9Cr steel in high pressure steam at 500°C. The proportion of hematite expected within the outer oxide layers produced in steam with oxygen partial pressures ≥10−20 bar is calculated to be very dependent on the metal oxidation rate and not on the oxygen partial pressure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00659247
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  • 8
    Electronic Resource
    Electronic Resource
    Studies on the mechanism of high temperature corrosion of cobalt in SO2 atmospheres with the use of18O and35S isotopes (1984)
    Springer
    Oxidation of metals 22 (1984), S. 101-115 
    Details
    ISSN: 1573-4889
    Keywords: cobalt ; oxidation ; sulfidation ; transport ; tracer ; autoradiographs
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The composition and morphology of scales formed on cobalt in sulfur dioxide atmospheres (1.013 × 105 Pa) at 850 and 900°C and transport phenomena occurring in the growing scales have been investigated. The transport phenomena have been studied by the marker method and with the use of SO2 labeled with the oxygen isotope18O and sulfur isotope35S. The scales were composed of sulfide and oxide mixtures and grew due to the outward diffusion of cobalt and inward transport of SO2 molecules through the discontinuities in the scale. These molecules, as well as the oxidant originating from the dissociation of the outer scale layer, take part in the formation of the inner scale layer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00656899
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  • 9
    Electronic Resource
    Electronic Resource
    Der cytologische Nachweis von doppelter Restitution beiFragaria (1984)
    Springer
    Plant systematics and evolution 146 (1984), S. 171-179 
    Details
    ISSN: 1615-6110
    Keywords: Angiosperms ; Rosaceae ; Fragaria ; Restitution ; microsporogenesis ; polyploidy ; evolution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Double restitution has been observed cytologically for the first time in microsporogenesis of a F1 hybridFragaria virginiana ×F. chiloensis ♂. Restitution is probably due to irregularities affecting the spindle mechanism. Single or double restitution may depend upon the duration of the effect or upon the stage of meiosis affected. The occurrence of triades is indicative of a possible intracellular diversity. Although the reason which may cause restitution remains to be ascertained, maternal inheritance indicates an extrachromosomal cause.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00989544
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  • 10
    Electronic Resource
    Electronic Resource
    Cytotaxonomy and phylogeny in certain species ofTaxodiaceae (1984)
    Springer
    Plant systematics and evolution 147 (1984), S. 29-54 
    Details
    ISSN: 1615-6110
    Keywords: Gymnosperms ; Cryptomeria ; Cunninghamia ; Metasequoia ; Sciadopitys ; Sequoia ; Sequoiadendron ; Taiwania ; Taxodium ; Marker chromosome ; karyotype ; polyploidy ; evolution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Various species ofTaxodiaceae were selected for chromosome studies to indicate cytotaxonomic and phylogenetic relationships. Point dispersal patterns of diagrammatic presentations of the species' karyotypes, rather than marker chromosomes, were found to be the most significant cytotaxonomic characteristic in indicating phylogenetic relationships. Karyotypic evolution inTaxodiaceae appears to occur by unequal reciprocal translocations followed by pericentric and paracentric inversions. Cytotaxonomic relationships among species generally correspond to the phylogenetic relationships withinTaxodiaceae indicated by classical taxonomic classification. Presence and types of marker chromosomes may have the potential to indicate relationships between different coniferous families.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00984578
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