EurekaMag.com logo
+ Site Statistics
References:
48,253,228
Abstracts:
22,798,842
+ Resolve Accession
+ Subscribe to Site Feeds
EurekaMag Most Shared ContentMost Shared
EurekaMag PDF Full Text ContentPDF Full Text
+ PDF Full Text
Request PDF Full TextRequest PDF Full Text
Submit PDF Full TextSubmit PDF Full Text
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter
Follow on Google+Follow on Google+
Follow on LinkedInFollow on LinkedIn

+ Translate

Regulation of prothoracic gland activity in diapausing larvae of the wax moth, Galleria mellonella L. (Lepidoptera)


, : Regulation of prothoracic gland activity in diapausing larvae of the wax moth, Galleria mellonella L. (Lepidoptera). Insect Biochemistry and Molecular Biology 23(1): 33-41

The development of Galleria mellonella is arrested by a lowered temperature of 18 degrees C at the stage of the last instar post-spinning larva. The haemolymph ecdysteroid titre of these larvae is maintained at a low level of ca 5 pg of 20-hydroxyecdysone per micro 1. Different types of surgical manipulations including nerve cord-severance, implantation of the brain, prothoracic glands (PGs) or fat body accompanied with ecdysteroid titre measurements show that the low ecdysteroid titre in diapausing larvae is due to nervous inhibition of their PGs. The inhibitory input probably comes from the brain and is transmitted down to the PGs via the suboesophageal ganglion and paired cervical nerves. Severance of the nerve tracts at any level caused rapid activation of PGs of diapausing insects. Nervous inhibition of the PGs ceases about 6-9 b after transfer of diapausing larvae from the lower temperature to the diapause-terminating conditions of 30 degrees C. As long as the PGs are under nervous inhibitory control they are refractory to humoral stimulation. The brains of diapausing larvae exhibit in vitro high prothoracicotropic activity which suggests that PTTH is accumulated in the brain during diapause. The role of juvenile hormone in inhibiting the release of PTTH from the brain to haemolymph, and its effect on the PGs during diapause is discussed.

Order PDF Full Text

Close
Close

Click here to order any other PDF Full Text


Accession: 002477246

DOI: 10.1016/0965-1748(93)90079-8

PDF Full Text: Regulation of prothoracic gland activity in diapausing larvae of the wax moth, Galleria mellonella L. (Lepidoptera)


Submit PDF Full Text

No spam - Every submission is manually reviewed

Due to poor quality, we do not accept files from Researchgate

Submitted PDF Full Texts will always be free for everyone
(We only charge for PDFs that we need to acquire)

Select a PDF file:
Close
Close

Other references

Anonymous, 1955: An outline of botanical research on varieties.. The work of the Institute for Research on Varieties of Crop Plants, Wageningen, is outlined. Under the rules regulating the issue of patent rights to plant breeders in the Netherlands, a new variety has to breed true and be readily distinguishable...

Olteanu, A., 1970: Investigation of the effect of chemical fertilizers applied in split dressings on the yield and quality of irrigated mixed maize/bean crops. In field trials in 1966-8, mixed crops of maize and Phaseolus vulgaris were given 64 kg N + 32 kg P2O5, 128 kg N + 64 kg P2O5 or 192 kg N + 96 kg P2O5/ha, either at sowing time or in 3 split dressings at sowing, flowering and pod swelling in P. vu...

Nishikado, Y.; Takahashi, R.; Hiura, U., 1949: Studies on the disease resistance of barley varieties. Nogaku Kenkyu Rept Ohara Inst Agric Res 38(4): 21-31

Winter, G., 1998: The ferret files. Nursing Times 94(12): 39-39

Katz, J., 1965: The effective collection of fly ash at pulverized coal-fired plants. Journal of the Air Pollution Control Association 15(11): 525-528

Anonymous, 2013: Emperor penguin surface temperatures. Emperor penguins <I>Aptenodytes forsteri</I> are able to survive the harsh Antarctic climate because of specialized anatomical, physiological and behavioural adaptations for minimizing heat loss. Heat transfer theory predicts that meta...

Varela, M.F.; Hooper, A.S.; Rivadulla, E.; Romalde, Jús.L., 2016: Human Sapovirus in Mussels from Ría do Burgo, A Coruña (Spain). The prevalence and genetical diversity of human Sapovirus were studied during an 18-month study in Ría do Burgo, an estuary nearby the city of A Coruña in Galicia (NW Spain). Sapovirus was detected using RT-qPCR procedure in 30 out of 80 mussel...

Naidu, S.; Kaufmann, W.E.; Abrams, M.T.; Pearlson, G.D.; Lanham, D.C.; Fredericksen, K.A.; Barker, P.B.; Horska, A.; Golay, X.; Mori, S.; Wong, D.F.; Yablonski, M.; Moser, H.W.; Johnston, M.V., 2001: Neuroimaging studies in Rett syndrome. Neuroimaging is a key instrument for determining structural and in vivo functional status of the brain, non-invasively. Multiple approaches can now determine aspects of anatomic and neurochemical changes in brain, and have been utilized effectivel...

Fowler, W.C.; Kim, J.; Cox, T.; Langford, C.A.; S.C.air, E.W., 1997: Ocular surface staining characteristics of lissamine green and rose bengal in patients with keratoconjunctivitis sicca and primary Sjogrens syndrome. Investigative Ophthalmology & Visual Science 38(4 PART 1-2): S151

Sidransky, H.; Verney, E.; Murty, C.N., 1981: Effect of elevated dietary tryptophan on protein synthesis in rat liver. This study investigated whether rats force-fed for three days an elevated (1%) tryptophan diet compared to a control (0.2% tryptophan) diet had changes in hepatic protein metabolism. Earlier, we showed that a single administration of L-tryptophan...