Delayed moulting caused by a factor from the corpus cardiacum of the cockroach,Periplaneta americana

1990 ◽  
Vol 77 (8) ◽  
pp. 391-392
Author(s):  
J. E. Steele ◽  
D. L. Wise
Keyword(s):  
Periplaneta Americana ◽  
Corpus Cardiacum

The Mode of Action of the Corpus Cardiacum on the Hind Gut in Periplaneta Americana

1962 ◽  
Vol 39 (3) ◽  
pp. 319-324
Author(s):  
K. G. DAVEY
Keyword(s):  
Central Nervous System ◽  
Nervous System ◽  
Peripheral Nervous System ◽  
Mode Of Action ◽  
Periplaneta Americana ◽  
Corpus Cardiacum ◽  
Corpora Cardiaca ◽  
The Central Nervous System ◽  
Hind Gut

1. Addition of a homogenate of corpora cardiaca to the fluid bathing an isolated hind gut of Periplaneta produces an increase in tonus, amplitude, frequency and co-ordination of contractions. 2. The corpus cardiacum acts by stimulating cells in the upper colon to release an indolalkylamine. 3. This amine acts on the mucles through a peripheral nervous system which can function in isolation from the central nervous system.

Corpus cardiacum stimulated trehalose efflux from cockroach (Periplaneta americana) fat body: control by calcium

1985 ◽  
Vol 63 (1) ◽  
pp. 63-66 ◽  
Author(s):  
J. E. Steele ◽  
T. Paul
Keyword(s):  
Cyclic Amp ◽  
Periplaneta Americana ◽  
Saline Solution ◽  
Fat Body ◽  
Surrounding Medium ◽  
Physiological Saline ◽  
Corpus Cardiacum ◽  
Physiological Saline Solution ◽  
Stimulation Of

Cockroach fat body incubated in a simple physiological saline solution releases trehalose to the surrounding medium. The output of trehalose occurs in the absence of ambient Ca2+ and decreases slowly with time. In two separate experiments, 0.1 mM CaCl2 added to the saline increased the output of trehalose on average by 70% but higher concentrations of Ca2+ did not further increase the efflux of trehalose. Stimulation of trehalose efflux by corpus cardiacum extract is absolutely dependent on extracellular Ca2+, no increase occurring beyond the basal level in the absence of the ion. The activity of corpus cardiacum extract increases as the concentration of CaCl2 is increased to 0.5 mM. This concentration of Ca2+ in the saline permits the extract to increase trehalose efflux by as much as 60% above the basal level. Corpus cardiacum extract, as well as the hypertrehalocaemic agents cyclic AMP and theophylline, increase significantly the influx of Ca2+ into fat body in vitro. The basal efflux of trehalose from fat body and that stimulated by corpus cardiacum extract is not dependent on extracellular Mg2+.

Effects of Brain and Corpus Cardiacum Extracts on Hæmolymph Trehalose of the Cockroach, Periplaneta americana

Nature ◽  
1964 ◽  
Vol 203 (4950) ◽  
pp. 1195-1196 ◽  
Author(s):  
CHARLES L. RALPH ◽  
ROSEMARY MCCARTHY
Keyword(s):  
Periplaneta Americana ◽  
Corpus Cardiacum
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