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  • Springer  (127)
  • Springer Nature  (76)
  • 1
    Electronic Resource
    Electronic Resource
    Acetone conversion to isobutene in high selectivity using zeolite β catalyst (1993)
    Springer
    Catalysis letters 21 (1993), S. 49-53 
    Details
    ISSN: 1572-879X
    Keywords: Acetone ; isobutene ; zeolite β
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The catalytic activity of the proton forms of zeolite β and ZSM-5 are compared for the conversion of acetone. Zeolite β demonstrates markedly enhanced selectivity to isobutene and selectivities of 〉80% can be achieved for conversions up to 65%. In contrast high selectivities to isobutene with ZSM-5 can be attained only at very low conversions (≤5%).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00767370
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  • 2
    Electronic Resource
    Electronic Resource
    Aromatization of propane over Ga/H-ZSM-5: An explanation of the synergy observed between Ga3+ and H+ (1991)
    Springer
    Catalysis letters 11 (1991), S. 89-93 
    Details
    ISSN: 1572-879X
    Keywords: Propane aromatization ; zeolite H-ZSM-5
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The aromatization of propane is investigated for Ga2O3, H-ZSM-5 and Ga2O3/H-ZSM-5 catalysts, and the results are discussed for a series of ZSM-5 catalysts containing varying SiO2/Al2O3 ratios. It is apparent that on addition of a gallium phase to H-ZSM-5, the yield of methane is significantly decreased. These results are discussed with respect to the mechanism of formation of the initial reaction product from propane. It is proposed that the synergy observed between the gallium compound and the zeolite can be explained in terms of a mechanism in which the role of the gallium phase is to induce C-H bond polarization in the propane, which leads to attack via the Bronsted acid sites of the zeolite, which leads to initial C-H bond cleavage occurring.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00866905
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  • 3
    Electronic Resource
    Electronic Resource
    Propane conversion over zeolite catalysts: Comments on the role of Ga (1991)
    Springer
    Catalysis letters 8 (1991), S. 115-123 
    Details
    ISSN: 1572-879X
    Keywords: Propane activation ; zeolite Y ; gallium oxide ; propane cracking ; propane dehydrogenation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The activation of propane using zeolite H-Y and Ga3+ exchanged zeolite Y indicates that in the presence of Ga3+ the mechanism of propane activation is changed from a cracking pathway to a dehydrogenation pathway. The presence of both Ga3+ and H+ are required to achieve this effect.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00764107
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  • 4
    Electronic Resource
    Electronic Resource
    Application of thermal-wave electron microscopy to imaging and assessment of corrosion on rough steel surface (1989)
    Springer
    Materials and structures 22 (1989), S. 71-79 
    Details
    ISSN: 1359-5997
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying
    Notes: Abstract Thermal-wave electron microscopy, which employs heat flow to probe variations in the thermal properties of solid materials, can provide micrometre-level resolution of surface and subsurface features of opaque samples. The effects of modulation frequency, phase detection and surface characteristics on the contrast and resolution of thermal-wave electron images of corrosion products on unprotected steel surfaces were investigated. Thermal-wave electron imaging is shown to be capable of distinguishing between the corrosion products and surface topographic features of the sample. This allows an automated image analysis technique to be used to assess quantitatively the extent of corrosion on rough steel surfaces.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02472698
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  • 5
    Electronic Resource
    Electronic Resource
    Lyrical drama and the “turbid mountebanks”: Styles of dialogue in romantic and renaissance tragedy (1994)
    Springer
    Computers and the humanities 28 (1994), S. 63-86 
    Details
    ISSN: 1572-8412
    Keywords: English ; romantic ; renaissance ; drama ; tragedy ; computational stylistics ; function-words ; multivariate statistics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Media Resources and Communication Sciences, Journalism
    Notes: Abstract Critics have condemned English Romantic tragedies as a series of poor imitations of Renaissance tragedy. This paper tests such “literary-critical” questions through statistical comparisons of ten plays from each group. The measures chosen give evidence of a strong and consistent difference between the groups, going beyond historical changes in the language. The Romantic tragedies are more expository; the Renaissance ones include more commonplace interactions between characters. The later plays do not show the marked variations in function-word frequencies of their predecessors. Of the Renaissance plays, Shakespeare's show the closest affinity to the Romantic tragedies, and the most telling contrasts.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01830688
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  • 6
    Electronic Resource
    Electronic Resource
    Transpiration of detached leaves from mycorrhizal and nonmycorrhizal cowpea and rose plants given varying abscisic acid, pH, calcium, and phosphorus (1998)
    Springer
    Mycorrhiza 8 (1998), S. 93-99 
    Details
    ISSN: 1432-1890
    Keywords: Key words Glomus intraradices ; Rosa hybrida ; Stomatal behavior ; Vesicular-arbuscular mycorrhiza ; Vigna unguiculata
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  Vesicular-arbuscular mycorrhizal (VAM) colonization can alter transpiration of host leaves, but scientists remain unclear about the mechanisms involved. We tested whether intact root systems were required to observe effects of root colonization by Glomus intraradices on leaf transpiration, or whether some VAM influence resided in leaves even after they were detached from root systems. We measured the transpiration of detached leaves of VAM and nonmycorrhizal plants exposed to different levels of several substances known to influence stomata locally or act in whole-plant regulation of transpiration: abscisic acid, calcium, phosphorus, and hydrogen ions. In rose, some VAM influence on transpiration resided in leaves, even after they had been separated from their root systems. However, removing leaves from their root systems eliminated the VAM influence on stomatal behavior of cowpeas.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s005720050218
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  • 7
    Electronic Resource
    Electronic Resource
    The effect of temporal environmental heterogeneity on community structure: a replicated experimental study (1983)
    Springer
    Oecologia 57 (1983), S. 98-102 
    Details
    ISSN: 1432-1939
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Periodicity, predictability and stochasticity of environmental perturbations are shown to influence the community structure that develops in microcosms. Sets of replicate, microalgal communities were subjected to different temporal patterns of rarefaction and resource resupply and their species-abundance patterns after 120 days of such manipulations were determined. Perturbations having, 1, 7, and 28 day periodicities differentially effected community structure. The predictability of these perturbations had a less profound influence on the communities which developed than the average perturbation periodicity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00379566
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  • 8
    Electronic Resource
    Electronic Resource
    Preliminary evaluation of the use of macrophage aggregates (MA) as fish health monitors (1985)
    Springer
    Bulletin of environmental contamination and toxicology 35 (1985), S. 222-227 
    Details
    ISSN: 1432-0800
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01636502
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  • 9
    Electronic Resource
    Electronic Resource
    Chrysophycean cysts (stomatocysts) from Lake Baikal and Irkutsk Reservoir, Siberia (1996)
    Springer
    Journal of paleolimnology 15 (1996), S. 271-277 
    Details
    ISSN: 1573-0417
    Keywords: Siberia ; Lake Baikal ; Russia ; Chrysophyceae ; stomatocyst ; statospore ; resting cyst
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences
    Notes: Abstract Chrysophycean cysts (stomatocysts, statospores) from Lake Baikal and Irkutsk Reservoir, Siberia, Russia have been investigated by means of scanning electron microscopy for the first time. The paper contains descriptions and illustrations of 7 particularly distinctive forms. Five of the cyst types described here are new to the literature. Two are very similar to cysts previously described from lake sediments in North America, but differ in details of surface ornamentation and cyst collar construction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00213046
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  • 10
    Electronic Resource
    Electronic Resource
    Chrysophyte reproduction and resting cysts: A paleolimnologist's primer (1991)
    Springer
    Journal of paleolimnology 5 (1991), S. 1-9 
    Details
    ISSN: 1573-0417
    Keywords: Chrysophyceae ; stomatocyst ; statospore ; cyst ; reproduction ; sex ; ecology ; paleolimnology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences
    Notes: Abstract Chrysophyte algae produce siliceous resting cysts (stomatocysts) that are becoming an increasingly useful class of paleoecological indicator microfossils. This paper provides a review of the role that stomatocysts play in the life cycle and reproductive ecology of freshwater planktonic chrysophytes. Such information provides paleolimnologists with greater insight into the ecology of the vegetative, planktonic growth phase of species contributing stomatocysts to lacustrine microfossil assemblages. Specific chrysophyte reproductive characteristics discussed include: temporal dynamics of vegetative growth and encystment, cyst induction, cyst survivorship, germination requirements and recruitment strategies. This information serves as an introduction to a special issue of the Journal of Paleolimnology which is dedicated to the ‘Application of Chrysophyte Stomatocysts in Paleolimnology’.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00226555
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