منابع مشابه
Effects of ecdysone injection on diapause termination in Pieris brassicae pupae . Evidence for a stimulatory action on endogenous ecdysone production
system, leading to a neosynthesis of ecdysone. A dose of 500 ng/pupa was sufficient to obtain synchronous adult development. Ecdysone injected either in whole or in decapitated pupae induced a neosynthesis of ecdysone, starting on day 5 after treatment, and the onset of imaginal development. Thus, we suggest that ecdysone can act independently of the brain, and that its stimulatory action on ec...
متن کاملAlterations in ecdysone content during the post-embryonic development of Chironomus thummi: correlations with chromosomal puffing.
The ecdysone titer of larvae and pupae of Chironomus thummi was determined by radioimmune assay (RIA) and revealed a concentration of about 150 ng/g fresh weigth in late third instar larvae and a peak of more than 450 ng/g fresh weight just preceding pupation. The ecdysone titer curve shows a high degree of correlation with previously observed puffing activity at the ecdysone sensitive chromoso...
متن کاملResponses to Ecdysone Express D ifferent Ecdysone Receptor lsoforms
In D. melanogaster a pulse of the steroid hormone ecdysone triggers the larval-to-adult metamorphosis, a complex process in which this hormone induces imaginal t issues to generate adult structures and larval tissues to degenerate. We show that the EcR gene encodes three ecdysone receptor isoforms (EcR-A, EcR-81 , and EcR-B2) that have common DNAand hormone-binding domains but different N-termi...
متن کاملMechanism of chromosomal boundary action: roadblock, sink, or loop?
Boundary elements or insulators subdivide eukaryotic chromosomes into a series of structurally and functionally autonomous domains. They ensure that the action of enhancers and silencers is restricted to the domain in which these regulatory elements reside. Three models, the roadblock, sink/decoy, and topological loop, have been proposed to explain the insulating activity of boundary elements. ...
متن کاملMechanisms of midgut remodeling: Juvenile hormone analog methoprene blocks midgut metamorphosis by modulating ecdysone action
In holometabolous insects such as mosquito, Aedes aegypti, midgut undergoes remodeling during metamorphosis. Insect metamorphosis is regulated by several hormones including juvenile hormone (JH) and 20-hydroxyecdysone (20E). The cellular and molecular events that occur during midgut remodeling were investigated by studying nuclear stained whole mounts and cross-sections of midguts and by monito...
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ژورنال
عنوان ژورنال: Nature
سال: 1980
ISSN: 0028-0836,1476-4687
DOI: 10.1038/285435a0