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  • 1
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    CO/H2, C/CO, OH/CO, and OH/O2 in dense interstellar gas: from high ionization to low metallicity (2015)
    Oxford University Press
    Details
    Publication Date: 2015-05-28
    Description: We present numerical computations and analytic scaling relations for interstellar ion-molecule gas-phase chemistry down to very low metallicities (10 –3  solar), and/or up to high driving ionization rates. Relevant environments include the cool interstellar medium (ISM) in low-metallicity dwarf galaxies, early enriched clouds at the reionization and Pop-II star formation era, and in dense cold gas exposed to intense X-ray or cosmic ray sources. We focus on the behaviour for H 2 , CO, CH, OH, H 2 O and O 2 , at gas temperatures ~100 K, characteristic of a cooled ISM at low metallicities. We consider shielded or partially shielded one-zone gas parcels, and solve the gas-phase chemical rate equations for the steady-state ‘metal-molecule abundances for a wide range of ionization parameters, / n , and metallicties, Z ' . We find that the OH abundances are always maximal near the H-to-H 2 conversion points, and that large OH abundances persist at very low metallicities even when the hydrogen is predominantly atomic. We study the OH/O 2 , C/CO and OH/CO abundance ratios, from large to small, as functions of / n and Z ' . Much of the cold dense ISM for the Pop-II generation may have been OH-dominated and atomic rather than CO-dominated and molecular.
    Print ISSN: 0035-8711
    Electronic ISSN: 1365-2966
    Topics: Physics
    Published by Oxford University Press
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  • 2
    Electronic Resource
    Electronic Resource
    Jump of the Oriental Rat Flea Xenopsylla cheopis (Roths.) (1972)
    [s.l.] : Nature Publishing Group
    Nature 239 (1972), S. 45-48 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The required energy is generated and stored by the compression of the pleural arch (which contains resilin)1'2 and the bending of the pleural and coxal walls by muscular contraction, and is released by cuticular click mechanisms. The force thus liberated travels through a series of roughly vertical ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/239045a0
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  • 3
    Electronic Resource
    Electronic Resource
    Anticholinesterase activity (in the Mediterranean fruit fly) and mouse toxicity of some new organophosphorus compounds (1966)
    Springer
    Entomologia experimentalis et applicata 9 (1966), S. 99-104 
    Details
    ISSN: 1570-7458
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Résumé Les auteurs ont étudié la corrélation entre la toxicité de quelques nouveaux composés organo-phosphoriques envers les adultes de la mouche des fruits (Ceratitis capitata) d'une part, et leur pouvoir inhibiteur (in vitro) sur la cholinestérase de la tête et leur toxicité envers les souris d'autre part. Les composés étudiés sont les analogues phényl- et thiénylphosphoniques et-phosphiniques de dichlorvos (DDVP), trichlorfon (Dipterex) et naled (Dibrom). Tandis que les insecticides les plus puissants — dichlorvos, O-méthyl O-(2,2-dichlorovinyl) phénylphosphonate et naled — furent aussi les inhibiteurs les plus efficaces de la cholinestérase, les auteurs n'ont pas trouvé une pareille corrélation pour les autres composés. Ainsi, certains étaient assez bons comme insecticides par application topicale mais possédaient seulement un faible effect sur la cholinestérase. Contrairement, certains anti-cholinestératiques assez puissants ne montraient qu'un faible pouvoir insecticide envers les mouches adultes. Les nouveaux composés étaient cependant généralement plus actifs dans les essais in vivo que dans ceux in vitro. Une augmentation du poids moléculaire dans une série entraine aussi une perte d'activité. L'analogue thiényl-phosphonique du dichlorvos offre une exception intéressante. Les auteurs n'ont pas trouvé une corrélation entre le pouvoir anticholinestératique de ces composés et leur toxicité envers les souris.
    Notes: Abstract Phenyl and thienyl substituted phosphinates and phosphonates, analogues of dichlorvos, trichlorfon and naled, were examined for their in vitro anticholinesterase activities to heads of the Mediterranean fruit fly, and for toxicities to mice. The data obtained are evaluated in comparison with toxicity results by topical application to adult flies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00341163
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  • 4
    Electronic Resource
    Electronic Resource
    A generalization of the notion of polarization (1986)
    Springer
    Annals of global analysis and geometry 4 (1986), S. 327-347 
    Details
    ISSN: 1572-9060
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00128051
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  • 5
    Electronic Resource
    Electronic Resource
    On the method of symes for integrating systems of the toda type (1983)
    Springer
    Letters in mathematical physics 7 (1983), S. 113-115 
    Details
    ISSN: 1573-0530
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract Let G=KL and g=k+l be Lie group and Lie algebra decompositions. This identifies k o with l *. Any G-invariant function, f, on g *induces by restriction a function f|k o =l *. We prove a formula which says that the integral curve through α∈k o is obtained as b(t)α, where a(t)=exp tξ with ξ=L f (α), $$\left( * \right){\text{ }}a\left( t \right) = b\left( t \right)c\left( t \right)$$ where (*) is the KL decomposition and where L f : g * → g is the Legendre transform. This generalizes a formula of Symes for the generalized Toda lattice.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00419928
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  • 6
    Electronic Resource
    Electronic Resource
    Convexity properties of the moment mapping (1982)
    Springer
    Inventiones mathematicae 67 (1982), S. 491-513 
    Details
    ISSN: 1432-1297
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01398933
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  • 7
    Electronic Resource
    Electronic Resource
    Geometric quantization and multiplicities of group representations (1982)
    Springer
    Inventiones mathematicae 67 (1982), S. 515-538 
    Details
    ISSN: 1432-1297
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01398934
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  • 8
    Electronic Resource
    Electronic Resource
    Convexity properties of the moment mapping. II (1984)
    Springer
    Inventiones mathematicae 77 (1984), S. 533-546 
    Details
    ISSN: 1432-1297
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01388837
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  • 9
    Electronic Resource
    Electronic Resource
    Birational equivalence in the symplectic category (1989)
    Springer
    Inventiones mathematicae 97 (1989), S. 485-522 
    Details
    ISSN: 1432-1297
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01388888
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  • 10
    Electronic Resource
    Electronic Resource
    Gene lineage analysis in populations ofHelianthus niveus andH. petiolaris (Asteraceae) (1991)
    Springer
    Plant systematics and evolution 175 (1991), S. 125-138 
    Details
    ISSN: 1615-6110
    Keywords: Angiosperms ; Asteraceae ; Helianthus niveus ; H. petiolaris ; Morphological intergradation ; speciation ; restriction-site variation ; gene lineage analysis ; plant taxonomy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Helianthus petiolaris andH. niveus are polytypic species which are morphologically distinct at the periphery of their ranges but intergrade in areas of sympatry.Helianthus niveus includes both annual and perennial members, whereasH. petiolaris is strictly annual. Chloroplast DNA and nuclear ribosomal DNA restriction site data were used to reconstruct the evolutionary history of populations of the two species. Cladistic analyses reveal the following: (1) neither species is monophyletic; (2) the annual habit is derived once in this complex; and (3) the region of morphological intergradation appears to be primary in origin. The significance of interbreeding versus common descent in defining species concepts is discussed in relation to the above cladistic analyses.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00937842
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