... senex senex and the giant mud crab, Scylla serrata . Administration of AA and prostaglandin F 2α (PGF 2α ) and prostaglandin E 2 (PGE 2 ) significantly increased ovarian index, oocyte diameter and ovarian vitellogenin levels and ecdysteroid and MF levels in the hemolymph of crabs. Secretions of MF...

...Julien Bacqué-Cazenave; Marion Berthomieu; Daniel Cattaert; Pascal Fossat; Jean Paul Delbecque ABSTRACT The molting process of arthropods, chiefly controlled by ecdysteroids, is generally considered very stressful. Our previous investigations have shown that crayfish, after having experienced...

...Hans C. Kelstrup; Klaus Hartfelder; Fabio S. Nascimento; Lynn M. Riddiford In the evolution of caste-based societies in Hymenoptera, the classical insect hormones juvenile hormone (JH) and ecdysteroids were co-opted into new functions. Social wasps, which show all levels of sociality and lifestyles...

... INTERESTS No competing interests declared. 17 9 2012 23 1 2013 © 2013. Published by The Company of Biologists Ltd 2013 Crustacea stretch reflex neuromodulation behavior posture molt ecdysteroids Arthropods are characterized by a rigid cuticle exoskeleton...

... division is age based or age flexible, and whether it coincides with differential expression of systemic hormones with known roles in behavioral regulation. Whole-body content of juvenile hormone (JH) and ecdysteroids was determined in workers from (1) age-typical colonies, in which a typical age structure...

... an endocrinologically induced molt cycle. The hypothesis that this expression is under the direct control of ecdysteroids was tested in this study both in vivo and in vitro . Unlike vitellogenin of insects, CqVg was not found to be ecdysteroid-responsive. Thus, a multigenic approach was employed for the identification...

...Norman T. Davis; Michael B. Blackburn; Elena G. Golubeva; John G. Hildebrand SUMMARY For normal development of Manduca sexta larvae, the ecdysteroid titer must drop following its sudden rise at the start of the molting cycle;this sudden decline in titer may be due to myoinhibitory peptide I (MIP I...

... (last) instar. Released PTTH activates the prothoracic glands (PGs), and within a few hours the cumulative effect of this event results in a dramatic increase in the haemolymph ecdysteroid titre, which then elicits the moult. An assessment of the capacity of the corpora allata (CA) to synthesize...

... inhibitory influence prior to wandering, which becomes excitatory during wandering. Ecdysteroids appear to alter locomotor function by acting at various levels including the segmental ganglia, the SEG and the brain. A model is advanced describing this effect. * Present address: Department...