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  • Springer  (571)
  • 2005-2009  (149)
  • 1990-1994  (309)
  • 1975-1979  (113)
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  • 1
    Electronic Resource
    Electronic Resource
    Laboratory evaluation of parasitic hymenoptera used in attempts to biologically control aphid pests of crops in Australia (1992)
    Springer
    Entomologia experimentalis et applicata 63 (1992), S. 177-185 
    Details
    ISSN: 1570-7458
    Keywords: Parasitic hymenoptera ; biological control ; aphid pests
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract As an integral part of a programme to attempt the biological control of several crop-infesting aphid pests in Australia by the introduction of specific hymenopterous parasites, a laboratory technique to try to predict their likely effectiveness in the field, was developed with the aim of improving selection of natural enemies in future. It was based on demonstrating whether the parasites attack a greater proportion of their hosts with increased host density, i.e. whether they show a Type 3 functional response (Holling, 1959). To overcome the problem of super-parasitisation at low densities when a parasite is confined with aphids on one plant (van Lenteren & Bakker, 1976) we used several plants in a large cage, all with the same density of host aphids. A parasite released into such a cage searches for and attacks the aphids on one plant, then leaves it to repeat the process on a second plant, and so on. After a standard exposure time the parasitisation rate is estimated separately for the aphids on each plant and the average performance of the parasite calculated. Using this technique for seven parasites introduced into Australia for biological control of crop aphids, only one, Aphidius salicis Halliday, attacking carrot aphid showed a Type 3 response.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00343577
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  • 2
    Electronic Resource
    Electronic Resource
    Adaptive evolution in the rat olfactory receptor gene family (1993)
    Springer
    Journal of molecular evolution 36 (1993), S. 249-254 
    Details
    ISSN: 1432-1432
    Keywords: Adaptive evolution ; Olfactory receptor ; Multigene families
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Comparison of DNA sequences of the rat (Rattus norvegicus) olfactory receptor gene family revealed an unusual pattern of nucleotide substitution in the gene region encoding the second extracellular domain (E2) of the protein. In this domain, nonsynonymous nucleotide differences between members of this subfamily that caused a change in amino acid residue polarity were over four times more frequent than nonsynonymous differences that did not cause a polarity change. This nonrandom pattern of nucleotide substitution is evidence of past directional selection favoring diversification of the E2 domain among members of this subfamily. This in turn suggests that E2 may play some important role in the functions unique to each member of the olfactory receptor family, and that it may perhaps be an odorant binding domain.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00160480
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  • 3
    Electronic Resource
    Electronic Resource
    Two major groups of colicin factors: Their molecular weights (1978)
    Springer
    Molecular genetics and genomics 159 (1978), S. 219-221 
    Details
    ISSN: 1617-4623
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Colicin factors are thought to fall into two taxonomic groups which differ in, amongst other properties, the molecular weight of the plasmid DNA and the host range of the colicin protein. This hypothesis is supported by the plasmids found in 26 colicinogenic strains. Two small Col factors may have arisen from larger factors, judging from similarities between their colicins.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00270897
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  • 4
    Electronic Resource
    Electronic Resource
    Book reviews (1992)
    Springer
    World journal of microbiology and biotechnology 8 (1992), S. 550-551 
    Details
    ISSN: 1573-0972
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01201962
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  • 5
    Electronic Resource
    Electronic Resource
    An attempt to anticipate biological control ofDiuraphis noxia (Hom., Aphididae) (1994)
    Springer
    BioControl 39 (1994), S. 211-223 
    Details
    ISSN: 1573-8248
    Keywords: Diuraphis noxia ; Aphelinus varipes ; Australia ; anticipating biological control
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Description / Table of Contents: Résumé Pour répondre à la menace que représente pour la céréaliculture australienne la dispersion mondiale deDiuraphis noxia (Mordvilko), il a été procédé à un essai de lutte biologique préventive par l'introduction d'un parasitoïde oligophageAphelinus varipes (Foerster) dans la biocénose aphidienne présente actuellement sur les céréales d'Australie. Des précisions sont données sur l'origine du parasitoïde utilisé, son introduction, son élevage et son lâcher en Australie, ainsi que sur les études connexes au champ et en laboratoire.A. varipes ne semble pas s'être acclimaté jusqu'à maintenant; les causes possibles sont analysées et discutées.
    Notes: Abstract Responding to the threat posed to the Australian wheat industry by the world-wide spread of the Russian wheat aphid,Diuraphis noxia (Mordvilko), an attempt to anticipate its biological control was made by introducing its oligophagous hymenopteran parasiteAphelinus varipes (Foerster) into the current Australian cereal aphid community. Details, of the source of the parasite material and its introduction, mass-rearing and release in Australia, together with follow-up studies in the field and laboratory are given. No evidence of establishment has been found so far and the possible reasons for this are explored and discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02372359
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  • 6
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    Characterization of a TeflonÒcoated semiconductor detector flow cell for monitoring of pertechnetate in groundwater (2006)
    Springer
    Details
    Publication Date: 2006-01-01
    Print ISSN: 0236-5731
    Electronic ISSN: 1588-2780
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Published by Springer
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    PAPER CURRENT
  • 7
    Electronic Resource
    Electronic Resource
    Muonium (1992)
    Springer
    The European physical journal 56 (1992), S. S35 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A brief review is given of current and future fundamental topics in muonium research including the ground state hfs and Zeeman effect, the Lamb shift in the n=2 state and spontaneous conversion of muonium to antimuonium. The important 1S→2S transition is discussed by K. Jungmann in this volume. It is emphasized that muonium as an atom composed of two leptons is superior to hydrogen for many precise fundamental studies because of the complexities and uncertainties for hydrogen associated with the proton as a hadron.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02426773
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  • 8
    Electronic Resource
    Electronic Resource
    Propagation of charged particles in laser beams with parabolic intensity profiles with application to isotope separation (1979)
    Springer
    Optical and quantum electronics 11 (1979), S. 278-281 
    Details
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00620115
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  • 9
    Electronic Resource
    Electronic Resource
    Analysis of a stacked-triangular platinum carbonyl cluster dianion, [Pt3(CO)6] 3 2− by252Cf-Plasma Desorption Mass Spectrometry (1993)
    Springer
    Journal of cluster science 4 (1993), S. 453-470 
    Details
    ISSN: 1572-8862
    Keywords: 252Cf-PDMS ; metal cluster ; metal carbonyl ; mass spectrometry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract 252Cf-Plasma Desorption Mass Spectrometry (252Cf-PDMS) has been used to investigate the [(Ph3PCH2C5H4)Fe(C5H5)]+ salt of the prototype dianionic, platinum carbonyl cluster, [Pt3(CO)3(μ2-CO)3] 3 2− . An envelope of singly charged [Pt9(CO) x ]− ions with the principal peak centered atx=8 was observed in the negative ion mass spectrum as a result of successive losses of the carbonyl ligands from the intact platinum core. Another feature of the negative ion spectrum was the prominent occurrence of other envelopes of multiple peaks which conform to Pt12, Pt15, Pt18, Pt21, and Pt24 singly charged metal cores. An unexpected observation was the presence of singly charged positive ions of the dianionic cluster which were formed without incorporation of the counterion. A similar but, largely unresolvable, broad envelope of singly charged ions containing the Pt9 core resulted with a peak maximum corresponding closely to the completely carbonylated cluster. The peak distribution extended from the fully decarbonylated cluster to well beyond the mass of the fully carbonylated cluster. Analogous peaks attributable to singly charged positive ions of the Pt12, Pt15, and Pt18 clusters were also evident. Very little fragmentation was observed below the molecular ion in either the positive or negative ion mass spectra except for ions associated with the counterion. A detailed analysis of the mass spectra, including the types of ions observed and correlations with the molecular architecture are described.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00703737
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  • 10
    Electronic Resource
    Electronic Resource
    Electrolytes for methanol-air fuel cells. 11. The electro-oxidation of methanol in trifluoromethane-sulphonic acid monohydrate and aqueous solutions of trifluoromethane-sulphonic acid (1977)
    Springer
    Journal of applied electrochemistry 7 (1977), S. 161-174 
    Details
    ISSN: 1572-8838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract Trifluoromethanesulphonic acid monohydrate CF3SO3H.H2O and its aqueous solutions have been evaluated as an electrolyte for methanol electro-oxidation. The performances of conventional noble metal catalysts in the pure monohydrate are very poor compared with those in 3 M sulphuric acid. This is contrary to previously published literature data, and possible reasons for the discrepancy are given. In aqueous solutions of CF3SO3H at concentrations between 10 and 50%wt. considerably improved performance is obtained and at 60° C the activities of the catalysts are in most cases slightly higher than in 3 M H2SO4. In addition the poisoning effect of acid radicals is considerably less in CF3SO3H than in H2SO4 solutions. Above 60° C, however, the aqueous CF3SO3 anion decomposes to produce sulphur, which poisons the noble metal catalysts. Carbon-13 NMR studies of the CF3SO3H/H2O/CH3OH system were carried out at 20 and 37° C. From the results it was concluded that no significant ester formation occurred between CH3OH and CF3SO3H.H2O at these temperatures. Earlier published data on1H NMR studies of these solutions had indicated that 100% of the methanol was involved in ester formation with the acid. A critical analysis of this1H NMR work is given. Cyclic voltammetric characterization of catalysts in 10 and 25%wt. aqueous CF3SO3H solutions gave similar results to those in 3 M H2SO4; however, at concentrations of 50% wt. the acid decomposed at 0.0 V to produce a sulphur species that poisoned the catalyst. The conclusion of the work was that while aqueous CF3SO3H solutions produced promising catalyst performance up to 60° C the slight improvement in performance over 3 M H2SO4 would not offset the greater expense of the CF3SO3H. In addition, it was suspected that the long-term stability of the aqueous solutions even at 60° C might be poor.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00611039
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