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  • 1
    Electronic Resource
    Electronic Resource
    Use of the frontal bone in age determination of Labeo horie (Pisces, Cyprinidae) in Jebel Aulia Reservoir, Sudan (1984)
    Springer
    Hydrobiologia 110 (1984), S. 281-286 
    Details
    ISSN: 1573-5117
    Keywords: Sudan ; frontal bone ; age determination ; cyprinidae ; Jebel Aulia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In spite of the exuberance of recent approaches to age determination of fish, many ecologists are convinced that the most valid method is age reading from permanent marks or growth rings laid on skeletal parts. Of the known structures used, only the vertebrae are suitable and readable for a large variety of species and sizes. Examination of different skeletal structures of Labeo horie, a Cyprinid collected from Jebel Aulia reservoir, revealed that the frontal bone carried well-defined growth rings. The validity of these rings was checked against other direct and indirect methods of age determination. Results proved to be statistically valid, and the frontal bone offers an additional device of age determination of L. horie.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00025799
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  • 2
    Electronic Resource
    Electronic Resource
    Breeding of Barbus bynni (Pisces, Cyprinidae) in Jebel Aulia Reservoir, Sudan (1984)
    Springer
    Hydrobiologia 110 (1984), S. 319-325 
    Details
    ISSN: 1573-5117
    Keywords: Sudan ; Pisces ; Cyprinidae ; Barbus bynni ; breeding ; Jebel Aulia Reservoir
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Barbus bynni begins to mature at Age IV. Ripening of gonads of mature fish starts in May when water temperature approaches the annual maximum. However, the spawning season coincides with the onset of the flood season in July. These facts, as well as the cyclic growth of the gonads, show that B. bynni spawns once a year. Fecundity varies with size of fish and gonads. However, this levels off in the middle size group. At this age the fecundity was estimated to be 1 424 693 eggs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00025804
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  • 3
    Electronic Resource
    Electronic Resource
    Food and feeding habits of Labeo niloticus (Pisces, Cyprinidae) in Jebel Aulia Reservoir, Sudan (1984)
    Springer
    Hydrobiologia 110 (1984), S. 327-332 
    Details
    ISSN: 1573-5117
    Keywords: Sudan ; Pisces ; Cyprinidae ; food and feeding
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Basic knowledge on the feeding ecology of one of the common and commercially important fish species in Jebel Aulia Reservoir is provided. The structure of the feeding apparatus indicates that Labeo niloticus is a bottom feeder, depending on soft and decayed vegetation, organic debris and whatever small organisms found within. However, juveniles and fry are prone to explore all layers and depths of the river selectively for plankton. There is little evidence of seasonal selection of food. Changes in diet quality are governed by the availability of type of food. Variability of feeding activity is connected with climate and breeding season.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00025805
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  • 4
    Electronic Resource
    Electronic Resource
    Die Umsetzung von Benzilsäure mit Harnstoff (1954)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 585 (1954), S. 200-208 
    Details
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.19545850119
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  • 5
    Electronic Resource
    Electronic Resource
    Reactions of Substituted Hydroxybenzofurans. IIFor Part I, see reference [3]. (1973)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 315 (1973), S. 227-234 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Bromination of 6-methoxy-2,3-diphenylbenzofuran 1 b leads to the 5-bromo derivative 5 a, whereas 5-methoxy-2,3-diphenylbenzofuran 3b yields the 4,6-dibromo derivative 4b.Nitration of 5-hydroxy-2,3-diphenylbenzofuran 3a gave 6-nitro-5-hydroxy-2-(p-nitrophenyl)-3-phenylbenzofuran 8a. On the other hand, nitration of 3 b yields the mononitro derivative, namely the 5-nitro compound 5 b.Bromination of 10a yields the 4-bromo derivative 10 b.Oxidation of 5a, 4b, 8a, 10a, 5b and 10 b followed by hydrolysis gives the benzophenone derivatives 6c, 7b, 9b, 9b, 6f and 7c, respectively.Both 5 b and 10a were reduced to the corresponding amino derivatives.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19733150206
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