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Chromosome study of hybrid and gynogenetic offspring of artificial crosses between members of the catfish families Clariidae and Pangasiidae (1993)

Na-Nakorn, Uthairat ; Sidthikraiwong, Prasit ; Tarnchalanukit, Wit ; [et al.]

Springer

Environmental biology of fishes 37 (1993), S. 317-322

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ISSN: 1573-5133

Keywords: Interfamilial hybridization ; Hybrid morphotypes ; Triploid ; Clarias macrocephalus ; Pangasius sutchi ; Fishes

Source: Springer Online Journal Archives 1860-2000

Topics: Biology

Notes: Synopsis Artificial hybridization between species of the catfish families Clariidae (Clarias macrocephalus) and Pangasiidae (Pangasius sutchi) resulted in first generation offspring comprising two intermediate morphotypes and one morphotype indistinguishable from its clariid parent. The two intermediate morphotypes apparently correspond to hybrid morphotypes 2 and 4 resulting from earlier hybridization experiments between the same parent species (Tarnchalanukit 1986). We did not obtain morphotypes 1 and 3. Chromosome spreads of the relatively pangasiid-like morphotype 2 reveal a diploid number of 57, presumably comprising one set of Clarias (n=27) and one of Pangasius (n=30) chromosomes. The relatively clariid-like morphotype 4 is a triploid with 84 chromosomes, presumably comprising two sets from Clarias (2n=54) and one from Pangasius (n=30). Finally, the morphotype indistinguishable from Clarias, is a diploid with 54 chromosomes, apparently arising from gynogenesis.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00004639

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Graft copolymer of gelatin/butyl acrylate and its use in the dye transferring blank film (1989)

Li, Zhi-Chong ; Fu, Zhi-Feng ; Huang, Ming-Zhi ; [et al.]

New York, NY [u.a.] : Wiley-Blackwell

Journal of Applied Polymer Science 38 (1989), S. 2171-2182

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ISSN: 0021-8995

Keywords: Chemistry ; Polymer and Materials Science

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics

Notes: Butyl acrylate was graft copolymerized onto gelatin using ceric ammonium nitrate as redox initiator. A series of grafted products with various gelatin-to-butyl acrylate ratios were prepared. The molecular weight of the grafted side chains and the number of grafting sites were measured. The possible grafting sites on gelatin macromolecules were pointed out through amino acid analysis. The electron micrograph and DSC analysis showed that the grafted chain (PBA) and backbone gelatin were in separated phases. The graft copolymer was used in the receiving layer of the dye transfer blank film, and the photographic, dye transfer printing, and some physicomechanical properties were studied with satisfactory results.

Additional Material: 4 Ill.