BODY CONSTRAINT AND DEVELOPMENTAL ARREST IN<i>GALLERIA MELLONELLA</i>L.: FURTHER STUDIES

Sehnal, František; Edwards, John S.

doi:10.2307/1540107

Cited by 14 publications

(3 citation statements)

References 12 publications

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“…The mode of activation of the brain in lepidopteran larvae is obscure, but may involve the nervous system as was suggested by Edwards (1966). This conclusion is supported by the experiments using bracon venom (a potent inhibitor of neural activity), (Edwards and Sernka, 1969), physical restraint (Edwards, 1966) and nerve transection (Sehnal and Edwards, 1969) all of which inhibited normal metamorphosis of Galleria larvae.…”

Section: Role Of the Brain In The Injury Induction Of Moltmentioning

confidence: 75%

INJURY INDUCED MOLTING INGALLERIA MELLONELLALARVAE

Krishnakumaran¹

1972

The Biological Bulletin

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Injury to larval or nymphal insects usually causes a delay in molting (O'Farrell and Stock, 1953;Pohley, 1959Pohley, , 1960. When an appendage of a cockroach is amputated (O'Farrell, Stock and Morgan, 1956) or an imaginal wing disc is extirpated from lepidopteran larvae (e.g., Ephestia, Pohley, 1960; Galleria, Madhavan and Schneiderman, 1969) there is a delay in the onset of the succeeding molt. This delay is particularly obvious when the injury is inflicted before preparations for the succeeding molt are initiated and appears to be proportional to the magnitude of injury. Based on these facts, injury induced delay of molting

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Section: Role Of the Brain In The Injury Induction Of Moltmentioning

confidence: 75%

INJURY INDUCED MOLTING INGALLERIA MELLONELLALARVAE

Krishnakumaran¹

1972

The Biological Bulletin

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“…It is possible that the abdominal ganglia provide some essential input to the larval brain to signal the beginning of metamorphosis. Evidence is beginning to suggest that neural signals originating in the abdomen prime the brain to initiate metamorphosis (Edwards, 1966(Edwards, , 1967Sehnal and Edwards, 1969;Beck, 1970). We have undertaken a preliminary study of the possible involvement of the abdominal ganglia in regulating the onset of pupation of the southwestern corn borer.…”

Section: Discussionmentioning

confidence: 99%

Reappraisal of Proctodone Involvement in the Hormonal Regulation of Larval Diapause

Chippendale

Yin

1975

The Biological Bulletin

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1. No evidence was found that the larval ileum of the corn boners, Diatraea grandiosella and Ostrinia nubilalis, secretes a developmental hormone, "proctodone." 2. An abdominal ligature which isolated the ileum of diapause larvae of both species caused high mortality but did not retard the pupation rate. 3. Extracts prepared from the ileal epithelium of mature nondiapause larvae of D. grandiosella were injected into diapause larvae and did not cause premature diapause termination. 4. Marked cytological changes occurred in the ileum at the onset of metamorphosis. At times the ileal epithelium of both species displayed auto and acridine orange-induced fluorescence, characteristic of lysosomes. 5. An electron microscopic examination of the autofluorescent ileal epithelium of D. grandiosella revealed organelles which had typical lysosomal features and stained positively for acid phosphatase activity. 6. The secretory activity of the ileum can be accounted for by lysosomal involvement in its metamorphic reorganization, and by its osmoregulatory functions.

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“…Several attempts have been made to assess the effects of the Lorentz force to show that, in principle, it is negligible compared to some other important effects (e.g. Sehnal 1969). However, the necessary high precision of orbital determination in some proposed space experiments (Ciufolini et al 1993) requires full knowledge of the electrodynamic effects connected with the Lorentz force, which we shall try to study in detail.…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic effects on the orbital motion of a charged spacecraft

Abdel‐Aziz

Khalil

2014

Res. Astron. Astrophys.

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This paper deals with the effects of electromagnetic forces on the orbital motion of a spacecraft. The electrostatic charge which a spacecraft generates on its surface in the Earth's magnetic field will be subject to a perturbative Lorentz force. A model incorporating all Lorentz forces as a function of orbital elements has been developed on the basis of magnetic and electric fields. This Lorentz force can be used to modify or perturb the spacecraft's orbits. Lagrange's planetary equations in the Gauss variational form are derived using the Lorentz force as a perturbation to a Keplerian orbit. Our approach incorporates orbital inclination and the true anomaly. The numerical results of Lagrange's planetary equations for some operational satellites show that the perturbation in the orbital elements of the spacecraft is a second order perturbation for a certain value of charge. The effect of the Lorentz force due to its magnetic component is three times that of the Lorentz force due to its electric component. In addition, the numerical results confirm that the strong effects are due to the Lorentz force in a polar orbit, which is consistent with realistic physical phenomena that occur in polar orbits. The results confirm that the magnitude of the Lorentz force depends on the amount of charge. This means that we can use artificial charging to create a force to control the attitude and orbital motion of a spacecraft.

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BODY CONSTRAINT AND DEVELOPMENTAL ARREST INGALLERIA MELLONELLAL.: FURTHER STUDIES

Cited by 14 publications

References 12 publications

INJURY INDUCED MOLTING INGALLERIA MELLONELLALARVAE

INJURY INDUCED MOLTING INGALLERIA MELLONELLALARVAE

Reappraisal of Proctodone Involvement in the Hormonal Regulation of Larval Diapause

Electromagnetic effects on the orbital motion of a charged spacecraft

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