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Cyclic layer deposition in the cockroach (Blaberus craniifer) endocuticle: a circadian rhythm in leg pieces cultured in vitro

, : Cyclic layer deposition in the cockroach (Blaberus craniifer) endocuticle: a circadian rhythm in leg pieces cultured in vitro. Journal of Insect Physiology 41(2): 153-161

Pieces from hind tibiae of freshly moulted imaginal cockroaches were cultured in vitro. In most pieces endocuticle was deposited in vitro. This endocuticle showed either a multilamellate or a "circadian-like" structure. The latter type consisted of double layers each of them being composed of one lamellate and one nonlamellate layer, and thus resembled the in vivo structure of endocuticle deposited in the cockroach legs. Circadian-like endocuticle was deposited almost exclusively around the base of the spines. The number of double layers never exceeded the number of days in vitro; frequently, however, it was smaller. In order to estimate the frequency of the deposition rhythm of circadian-like endocuticle, exogenous time marks were set by autoradiographic labelling with 3H-N-acetyl-D-glucosamine. Largely independent of the temperature applied, the frequency was about one double layer deposited per day. Thus, it seems that in vitro deposition of endocuticle double layers is controlled by a circadian clock. It is supposed that the clock operating in vitro is localized in the epidermis.

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Accession: 002588617

DOI: 10.1016/0022-1910(94)00092-u

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