Concentrations Des Bases Fixes Et Types De Composition De La Base Totale De l'hémolymphe Des Insectes

Duchateau, G; Florkin, Marcel; Leclercq, Jean

doi:10.3109/13813455309146555

Cited by 96 publications

(20 citation statements)

References 18 publications

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“…Hoyle (1955a) found that a concentration of 10 mM-Mg reduced the end-plate potential to a very small size and led to the disappearance of the active membrane of 'spike' response of locust and cockroach muscle. This value is only 0-5-0-2 of the values for the blood Mg of many herbivorous insects (Clark & Craig, 1953;Duchateau et al 1953). If all the magnesium found in the blood of these insects is present in the form of unbound ions, there must be some difference in magnesium tolerance between the muscles of herbivorous and other insects.…”

mentioning

confidence: 85%

“…The ionic composition of the haemolymph of most insects is closely related to their diet (Bone, 1944;Clark & Craig, 1953;Duchateau, Florkin & Leclerq, 1953). In herbivorous insects the blood sodium and potassium levels are similar to those of the food plant, but magnesium is higher and calcium lower than in the food plant (Duchateau et al 1953). The sodium: potassium and calcium: magnesium ratios of the haemolymph are both less than unity.…”

mentioning

confidence: 99%

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The effect of ions upon neuromuscular transmission in a herbivorous insect

Wood¹

1957

The Journal of Physiology

115

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mentioning

confidence: 85%

mentioning

confidence: 99%

The effect of ions upon neuromuscular transmission in a herbivorous insect

Wood¹

1957

The Journal of Physiology

115

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“…This concentration was approximately 50% of the average KCl concentration in potato foliage (Duchateau et al, 1953;Duke and Atchley, 1986) and wheat germ diet (Bell and Joachim, 1976). For the lateral sensilla styloconica, responses to this concentration of KCl were dramatically lower in solanaceous-reared larvae in comparison to larvae reared on wheat germ diet, for both the phasic and tonic potions of the response.…”

Section: Response To Kclmentioning

confidence: 99%

Chemosensory tuning to a host recognition cue in the facultative specialist larvae of the mothManduca sexta

Campo

Miles

2003

Journal of Experimental Biology

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SUMMARYLarvae of Manduca sexta are facultative specialists on plants in the family Solanaceae. Larvae reared on solanaceous foliage develop a strong preference for their host; otherwise, they remain polyphagous. The host-specific recognition cue in potato foliage for Manduca larvae is the steroidal glycoside, indioside D. Two pairs of galeal taste sensilla, the lateral and medial sensilla styloconica, are both necessary and sufficient for the feeding preferences of host-restricted larvae. We conducted electrophysiological tip recordings from sensilla of solanaceous or wheat germ diet-reared larvae. For each animal, recordings of the responses to indioside D, glucose, tomatine and KCl were compared. All responses included both phasic and tonic portions. The sensilla styloconica of solanaceous-reared larvae were tuned to indioside D, defined as maintaining a high sensitivity to indioside D, while showing lower sensitivity to other plant compounds. Half of the sensillar neurons of solanaceous-reared larvae were `tuned' to indioside D,whereas those of wheat germ diet-reared larvae were not. The different responses between the two types of animals were a result of changes of individual receptor cells' responses in the sensilla. Feeding on solanaceous foliage therefore appears to result in a modification of the physiological responses of individual taste receptor cells that causes them to be tuned to the host-recognition cue indioside D. We propose that this tuning is the basis for the host-restricted larvae's strong behavioral preferences for solanaceous foliage.

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“…This is to be expected, however, since in nature insects appear to be very tolerant to concentrations of Mg in their haemolymph that would paralyse any vertebrate skeletal muscle (e.g. Duchateau, Florkin & Leclercq, 1953).…”

Section: The Action Of Drugsmentioning

confidence: 99%

Spontaneous miniature potentials from insect muscle fibres

Usherwood¹

1963

The Journal of Physiology

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The most widely applicable hypothesis for transmission across the synapse between the motor nerve terminals and the muscle membrane envisages the release of quantal packets of chemical transmitter, each packet containing many molecules, from the presynaptic terminals, and the attachment of these packets to receptor sites on the post-synaptic membrane to produce a transient depolarization; the magnitude of the depolarization is held to be partly dependent on the number of quanta released. The arrival of the nerve impulse at the presynaptic terminals is thought to produce the discharge of a great number of these quantal packets of transmitter within a millisecond or so to produce a depolarization of the post-synaptic membrane called the post-synaptic potential. In the absence of nerve stimulation randomly occurring spontaneous potentials, usually less than 1 mV in magnitude, are recorded from the junctional regions of both vertebrate (e.g. Fatt & Katz, 1952) and crustacean muscle (Dudel & Orkand, 1960). It has been suggested that these miniature potentials result from a sporadic release of transmitter from the nerve terminals.Spontaneous miniature post-synaptic potentials have now been observed in insect muscle fibres. A preliminary note on these has already appeared (Usherwood, 1961). This note also described some of the effects which changes in the osmotic pressure of the bathing solution produced in the discharge frequency of the miniature potentials. In the present paper these observations are described in greater detail, together with additional observations, made subsequently, on the action of cations and drugs on the spontaneous discharge. METHODSRecordings were obtained from the metathoracic flexor and extensor tibiae muscles of the locust, Schistocerca gregaria, and the cockroaches, Blaberus giganteus and Periplaneta americana. Most experiments were performed with the metathoracic legs attached to the animal but with the central connexions of the nerves to the femoral muscles cut. The femoral muscles of a few isolated legs were also examined. The properties of these preparations have been described in previous publications (Hoyle, 1954;Usherwood, 1962a). For

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Concentrations Des Bases Fixes Et Types De Composition De La Base Totale De l'hémolymphe Des Insectes

Cited by 96 publications

References 18 publications

The effect of ions upon neuromuscular transmission in a herbivorous insect

The effect of ions upon neuromuscular transmission in a herbivorous insect

Chemosensory tuning to a host recognition cue in the facultative specialist larvae of the mothManduca sexta

Spontaneous miniature potentials from insect muscle fibres

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