Evidence against Hormonal Control of Integumentary Water Loss in Periplaneta Americana
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چکیده
منابع مشابه
Evidence against Hormonal Control of Integumentary Water Loss in Periplaneta Americana
The effect of decapitation on water loss from adult male cockroaches was studied in order to re-examine the possibility of hormonal modulation of integumental permeability. We found no effect of decapitation on the permeability or water content in measurements made on the pronotum. Although overall weight losses of the decapitated animals always exceeded those of intact animals, loss rates and ...
متن کاملHormonal control of integumentary water-loss: evidence for a novel neuroendocrine system in an insect (Periplaneta americana).
An accelerated water-loss was observed in decapitated individuals, no equivalent increase being obtained following severance of the nervous connectives in the neck. Injection of brain and, to a lesser extent, corpus cardiacum extract resulted in a significant reduction in the rate of loss of water from decapitated individuals. The accelerated water-loss observed following decapitation appeared ...
متن کاملEvidence of poly(ADP-ribosylation) in the cockroach Periplaneta americana.
Poly(ADP-ribosylation) is a post-translational modification of nuclear proteins typical of most eukaryotic cells. This process participates in DNA replication and repair and is mainly regulated by two enzymes, poly(ADP-ribose) polymerase, which is responsible for the synthesis of polymers of ADP-ribose, and poly(ADP-ribose) glycohydrolase, which performs polymer degradation. The aim of this wor...
متن کاملLaboratory evaluation of fipronil against Periplaneta americana & Blattella germanica.
BACKGROUND & OBJECTIVE In cockroach control, bait formulations are extensively used. Fipronil is one of the broad spectrum insecticides from phenyl pyrazole family available in bait formulation. The compound has been tested under field conditions. However, information on its effectiveness on different surfaces and at various density levels is not known. Therefore, the efficacy of a new formulat...
متن کاملWater and carbon dioxide loss from the cockroach Periplaneta americana (L.) measured using radioactive isotopes.
Tritiated water (THO) loss from Periplaneta americana is used to measure cuticular permeability (Pd). In dry air, following various periods of predesiccation, the values of Pd lie around 0.5 x 10(-9) ms-1, with the lowest values below 0.3 x 10(-9) ms-1, close to the lowest permeabilities previously reported. There is no obvious relationship between permeability and initial mass of the insect. A...
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ژورنال
عنوان ژورنال: Journal of Experimental Biology
سال: 1986
ISSN: 1477-9145,0022-0949
DOI: 10.1242/jeb.121.1.339