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  • Parthenocarpy  (2)
  • Catecholamine and serotonine metabolism  (1)
  • Inorganic Chemistry
  • entropy balance equation Boltzmann equation
  • 1980-1984  (5)
  • 1982  (3)
  • 1980  (2)
Sammlung
Schlagwörter
Verlag/Herausgeber
Erscheinungszeitraum
  • 1980-1984  (5)
Jahr
  • 1
    Digitale Medien
    Digitale Medien
    Fruit-set of unpollinated ovaries of Pisum sativum L. (1980)
    Springer
    Planta 147 (1980), S. 444-450 
    Details
    ISSN: 1432-2048
    Schlagwort(e): Abscisic acid ; Auxin ; Cytokinin ; Decapitation ; Fruit-set ; Gibberellin ; Parthenocarpy ; Pisum
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract The influence of removing the apical shoot and different leaves above and below the flower on the fruit-set of unpollinated pea ovaries (Pisum sativum L. cv. Alaska) has been studied. Unpollinated ovaries were induced to set and develop either by topping or by removing certain developing leaves of the shoot. Topping had a maximum effect when carried out before or on the day of anthesis, and up to four consecutive ovaries were induced to set in the same plant. The inhibition of fruit-set was due to the developing leaves and not to the apex. The third leaf above the first flower, which had a simultaneous development to the ovary, had the stronger inhibitory effect on parthenocarpic fruit-set. The application of different plant-growth regulators (indoleacetic acid, naphthylacetic acid, 2,4-dichlorophenoxyacetic acid, gibberellic acid, benzyladenine and abscisic acid) did not mimic the negative effect of the shoot.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00380186
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Fruit-set of unpollinated ovaries of Pisum sativum L. (1980)
    Springer
    Planta 147 (1980), S. 451-456 
    Details
    ISSN: 1432-2048
    Schlagwort(e): Abscisic acid ; Auxin ; Fruit-set ; Gibberellin ; Parthenocarpy ; Pisum
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract The development of parthenocarpic fruits of Pisum sativum L. cv. Alaska was induced by the application of different plant-growth regulators in aqueous solution to the emasculated ovaries in untopped plants. At least one compound in each of the groups of auxins (2,4-dichlorophenoxyacetic acid), cytokinins (benzyladenine), and gibberellins (gibberellic acid) was found active. Gibberellic acid (GA3), however, was the only substance which produced pods similar to those of fruits with seeds. The length of the pods obtained by GA3 was a linear function of the logarithm of the concentration of GA3 in the solution. The effect of GA3 (at a concentration which produced 50% of the maximum pod length) was enhanced by a simultaneous application of 2,4-dichlorophenoxyacetic acid. Abscisic acid (ABA) counteracted the effect of GA3 and of topping. The results suggest that gibberellins and ABA may exert a major regulatory control in natural fruit-set. Peas can be used for the assay of fructigenic activity and is an advantageous material for the study of the mode of action of gibberellins on fruit-set.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00380187
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    A kinetic derivation of extended irreversible thermodynamics (1982)
    Springer
    Journal of statistical physics 29 (1982), S. 387-396 
    Details
    ISSN: 1572-9613
    Schlagwort(e): Extended irreversible thermodynamics ; relaxation times ; constitutive equations ; conserved and nonconserved variables ; entropy balance equation Boltzmann equation ; moment method ; Burnett equations
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The basic postulates of the extended irreversible thermodynamics are derived from the kinetic model for a dilute monoatomic gas. Using the Grad 13-moment method to solve the full nonlinear Boltzmann equation for molecules conceived as soft spheres we obtain the microscopic expressions for the entropy flux, the entropy production, and the generalized Pfaffian for the extended definition of entropy as required by such a theory. Some of the physical implications of these results are discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01020794
    Standort Signatur Erwartet Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    Vinylkationen, 36. Solvolyse von Cycloalkylidenmethyl- und 1-Cyclopenten-1-yl-triflaten (1982)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 115 (1982), S. 772-782 
    Details
    ISSN: 0009-2940
    Schlagwort(e): Chemistry ; Inorganic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Beschreibung / Inhaltsverzeichnis: Vinyl Cations, 36. Solvolysis of Cycloalkylidenemethyl and 1-Cyclopenten-1-yl TriflatesCyclohexlidenemethyl triflate (2), cyclobutylidenemethyl triflate (5), 1-cyclopenten-1-yl triflate (7), bicyclo [3.1.0]hex-2-en-2-yl triflate (9), 1-cyclobutylideneethyl triflate (19), and 2-methyl-1-cyclopenten-1-yl triflate (29) were solvolyzed in solvents of various ionizing power and nucleophilicity and the solvolysis products were identified. The cyclobutylidenealkyl triflates solvolyze via a vinyl cation mechanism involving ion pairs with rearrangement to cyclopentene and cyclopentanone compounds. The 1-cyclopenten-1-yl triflates do not produce vinyl cation intermediates but give only the corresponding ketones via an O—S bond cleavage of the triflate group.
    Notizen: Cyclohexylidenmethyl-triflat (2), Cyclobutylidenmethyl-triflat (5), 1-Cyclopenten-1-yl-triflat (7), Bicyclo[3.1.0]hex-2-en-2-yl-triflat (9), 1-Cyclobutylidenethyl-triflat (19) und 2-Methyl-1-cyclopenten-1-yl-triflat (29) wurden in Lösungsmitteln verschiedener Ionisierungsstärke und Nucleophilie solvolysiert und die Solvolyseprodukte aufgeklärt. Die Cyclobutylidenalkyl-triflate solvolysieren über Ionenpaarmechanismen (Vinylkationen) unter Umlagerung zu Cyclopenten- und Cyclopentanon-Derivaten. Die 1-Cyclopenten-1-yl-triflate reagieren nicht über Vinylkationen als Zwischenstufe, sondern unter O—S-Spaltung zu den entsprechenden Ketonen.
    Zusätzliches Material: 6 Tab.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/cber.19821150238
    Standort Signatur Erwartet Verfügbarkeit
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  • 5
    Digitale Medien
    Digitale Medien
    Neurochemical studies on catecholamines and indoleamines by high-performance liquid chromatography with electrochemical detection (1982)
    Springer
    Chromatographia 16 (1982), S. 112-116 
    Details
    ISSN: 1612-1112
    Schlagwort(e): Reversed-phase HPLC ; Electrochemical detection ; Catecholamine and serotonine metabolism ; Tryptamine effect in CNS
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Summary This communication reports the HPLC separation and quantitative ECD assay of dopamine (DA) and its metabolites DOPAC and HVA, 5-HT and its metabolite 5-HIAA and the noradrenaline metabolites MHPG and VMA, in samples of rat brain extracts and human CSF. The separation is carried out by reversed-phase with a methanolic phosphate/citrate buffer as mobile phase. Response is linear within 10pg-20 ng. Rat brain homogenates of cortex plus striatum were centrifuged and 10–20 μl aliquots injected in the column. CSF samples were directly injected without any further manipulation. The method has been applied to the study of the possible neuromodulating role of T on the catecholaminergic and serotonergic transmission. For this purpose rats are injected intraperitoneally (ip) with T (150 mg/kg) and killed after 30 min. Relative to control rats, the results show that for n=12, T does not affect the basal level of DA and DOPAC whereas HVA increases a 99.3% and 5HT and 5HIAA show variations of 23% and — 4.1%, respectively. Aside from the fall of 5HIAA, it is interesting to note that the turnover rate of 5HT decreases, which might prove of functional significance.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02258880
    Standort Signatur Erwartet Verfügbarkeit
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