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  • 1990-1994  (2)
  • 1935-1939
  • 1925-1929
  • 05 C 99 (secondary)  (1)
  • 11-ketotestosterone  (1)
  • 1
    ISSN: 1573-5168
    Keywords: goldfish ; Carassius auratus ; testis ; sulfates ; 11-deoxycortisol ; 11-ketotestosterone ; corticosteroids ; 17,20α-dihydroxy-4-pregnen-3-one
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Résumé Des testicules de poissons rouges en cours de spermiation ont été incubés avec de la [3H]17-hydroxyprogestérone. L'androsténédione, l'androstènetrione, la 11β-hydroxyandrosténédione, la 11-cétotestostérone, la 17,20α-dihydroxy-4-pregnen-3-one (17,20αP) et le 11-déoxycortisol, ont été identifiés comme composés majeurs parmi les stéroîdes non conjugués. La testostérone est présente essentiellement sous forme de glucuronide, mais son taux de synthèse reste faible (1–3%). Les composés sulfatés prédominants sont la 17,20αP et le déoxycortisol. La cortisone, produite à un taux faible (〈 2,5%), a été identifiée aussi bien sous forme libre que sulfatée. C'est la première démonstration d'une biosynthèse de corticostéroîde par un testicule de poisson téléostéen. Du fait des taux élevés de synthèse de la 17,20αP, du deoxycortisol, et de leurs sulfates, leur rôles potentiels, en relation avec la spermiation du poisson rouge, mériteraient d'être davantage explorés.
    Notes: Abstract Testes from spermiating goldfish were incubated with [3H]17-hydroxyprogesterone. The major products in the unconjugated fraction were identified as androstenedione, androstenetrione, 11-β-hydroxyandrostenedione, 11-ketotestosterone, 17,20α-dihydroxy-4-pregnen-3-one (17,20αP) and 11-deoxycortisol. Testosterone was present predominantly in the glucuronide fraction, but yields were low (1–3%). The major components of the sulfate fraction were 17,20αP and 11-deoxycortisol. The identification of cortisone in low yield (〈 2.5010) in both the free and sulfate fractions is the first report of corticosteroid biosynthesis by a teleost testis. The high yields of 17,20αP and 11-deoxycortisol and their sulphates suggests that their possible role in spermiation of the goldfish should be further investigated.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Combinatorica 11 (1991), S. 9-15 
    ISSN: 1439-6912
    Keywords: 05 B 30 (primary) ; 05 C 99 (secondary)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract A λ-hyperfactorization ofK 2n is a collection of 1-factors ofK 2n for which each pair of disjoint edges appears in precisely λ of the 1-factors. We call a λ-hyperfactorizationtrivial if it contains each 1-factor ofK 2n with the same multiplicity γ (then λ=γ(2n−5)!!). A λ-hyperfactorization is calledsimple if each 1-factor ofK 2n appears at most once. Prior to this paper, the only known non-trivial λ-hyperfactorizations had one of the following parameters (or were multipliers of such an example) (i) 2n=2 a +2, λ=1 (for alla≥3); cf. Cameron [3]; (ii) 2n=12, λ=15 or 2n=24, λ=495; cf. Jungnickel and Vanstone [8]. In the present paper we show the existence of non-trivial simple λ-hyperfactorizations ofK 2n for alln≥5.
    Type of Medium: Electronic Resource
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