Tergal

An increase in rod-like arrangement of the macromolecules can also arise by stretching a polymer either in its solid state, either in the melt or even in solution (for polymers leading to lyotropic liquid crystals such as aromatic polyamides). This is the basis of the development of synthetic fibres including high modulus polyethylene Dyneema , polyamide Nylons and Kevlar , polyester Tergal or Dacron fibres. 

Apart from the primitive Deinopsini and Gymnusini, adult Aleocharinae show impaired tergal glands situated between tergites 6 and 7 [ 127]. Up to now, chemical data of the topically active defensive secretions are available from... 

In the Madera cockroach, Leucophaea maderae, male calling behavior involves the release of a sex pheromone from the abdominal sternal glands. The extracts of sternal glands attracted conspecific females over a distance and the compounds responsible were identified as hydroxy-3-butan-2-one, (27 , 37 )-butanediol, senecioic acid and ( )-2-octenoic acid. The same components are also present in the male tergal glands. 

Analytical studies of the tergal secretions of male B. germanica have identified a number of volatile compounds, none of which has so far been subjected to behavioral assays on females. Brossut et al. (1975) found p-hydroxybenzyl alcohol, o-hydroxybenzyl alcohol, di- and tri-methylnaphthalene, benzothiazole, two isomers of nonyl phenol, and myristic, palmitic, and oleic acids. The fatty acids constituted > 92% of the volatile fraction given their abundance in feces and frass, and their role as putative aggregation pheromones (Wileyto and Boush, 1983 Fuchs et al., 1985 Wendler and Vlatten, 1993 Scherkenbeck et al., 1999),... 

The male tergal gland produces several male-specific proteins (Korchi el al.,... 

Brossut, R. and Roth, L. M. (1977). Tergal modifications associated with abdominal glandular cells in the Blattaria. Journal of Morphology 151 259-297. 

Brossut, R., Dubois, P, Rigaud, J. and Sreng, L. (1975). Biochemical study of the secretion of the tergal glands of the Blattaria. Insect Biochemistry 5 719-732. 

Korchi, A., Farine, J.-P. and Brossut, R. (1998). Characterization of two male-specific polypeptides in the tergal glands secretions of the cockroach Leucophaea maderae (Dictyoptera, Blaberidae). Insect Biochemistry and Molecular Biology 28 ... 

Korchi, A., Brossut, R Bouhin, H. and Delachambre, J. (1999). cDNA cloning of an adult male putative lipocalin specific to tergal gland aphrodisiac secretion in an insect (Leucophaea maderae). FEBSLetters 449 125-128. 

Porcheron, P. (1975). Histological and cytological study of the tergal gland of Leucophaea maderae and of its development during sexual maturation of the male. Archives d Anatomie Microscopique et de Morphologie Experimentale 64 157-181. 

Roth, F. M. (1952). The tergal gland of the male cockroach, Supella supellectilium. Journal of Morphology 91 469 177. 

The evolution of male tergal glands in the Blattaria. Annals of the Entomological Society of America 62 176-208. 

Sreng, L. (1979a). Ultrastructure and chemistry of the tergal gland secretion of the male of Blattella germanica (L.) (Dictyoptera Blattelidae). International Journal of Insect Morphology and Embryology 8 213-227. 

Morphology of the sternal and tergal glands producing the sexual pheromones and the aphrodisiacs among the cockroaches of the subfamily Oxyhaloinae. Journal... 

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