Researching adult transformation as autobiography

1994 ◽  
Vol 13 (5) ◽  
pp. 389-403 ◽  
Author(s):  
Alex Nelson
Keyword(s):  
Adult Transformation

scholarly journals IMMUNOLOGICAL STUDIES OF INSECT METAMORPHOSIS

1954 ◽  
Vol 37 (4) ◽  
pp. 539-558 ◽  
Author(s):  
William H. Telfer
Keyword(s):  
Concentration Gradient ◽  
Maximum Concentration ◽  
Liquid Fraction ◽  
Pupal Stage ◽  
Detectable Amount ◽  
Clear Liquid ◽  
Egg Formation ◽  
Insect Metamorphosis ◽  
Adult Transformation ◽  
Lines Of Evidence

1. In the pupal stage of the cecropia silkworm, antigen 7, a protein with the solubility characteristics of an albumin, is present in female blood in approximately a thousand times higher concentration than in the blood of males. Antigen 7 is undetectable in the blood of larvae of either sex. It first appears in the blood after the larva has spun its cocoon, and is present throughout all subsequent stages of metamorphosis. Late in the pupal-adult transformation, when the eggs are produced, the concentration of antigen 7 in female blood decreases significantly. 2. An antigen which could not be distinguished from antigen 7 immunologically is present in solution in the yolk of unfertilized eggs. 3. In females which, by ovariectomy, were prevented from forming eggs, the concentration of antigen 7 in the blood increased during the usual period of egg formation rather than undergoing the normal decrease. Ovaries transferred to the hemocoel of males produced eggs but were unable to incorporate antigen 7 in the yolk unless a detectable amount of the protein was present in the blood. The ovaries of polyphemus females which had been transfused with cecropia blood incorporated cecropia antigen 7 into the eggs they produced. These lines of evidence indicate that antigen 7 is secreted into the blood by some tissue other than the ovaries, and that it is subsequently drawn from the blood and deposited in the yolk. 4. The concentration of antigen 7 in the clear, liquid fraction of the yolk is four times higher than the maximum concentration attained in the blood during metamorphosis, and twenty times higher than that of the blood at the conclusion of egg formation. The protein thus appears to be transferred from blood to yolk against a concentration gradient.

Broad specifies pupal development and mediates the ‘status quo’ action of juvenile hormone on the pupal-adult transformation inDrosophilaandManduca

Development ◽  
2002 ◽  
Vol 129 (9) ◽  
pp. 2259-2269 ◽  
Author(s):  
Xiaofeng Zhou ◽  
Lynn M. Riddiford
Keyword(s):  
Juvenile Hormone ◽  
Adult Development ◽  
Pupal Stage ◽  
Status Quo ◽  
Endocrine Control ◽  
The Status ◽  
Insect Metamorphosis ◽  
Adult Transformation ◽  
Late Expression ◽  
Pupal Cuticle

The understanding of the molecular basis of the endocrine control of insect metamorphosis has been hampered by the profound differences in responses of the Lepidoptera and the Diptera to juvenile hormone (JH). In both Manduca and Drosophila, the broad (br) gene is expressed in the epidermis during the formation of the pupa, but not during adult differentiation. Misexpression of BR-Z1 during either a larval or an adult molt of Drosophila suppressed stage-specific cuticle genes and activated pupal cuticle genes, showing that br is a major specifier of the pupal stage. Treatment with a JH mimic at the onset of the adult molt causes br re-expression and the formation of a second pupal cuticle in Manduca, but only in the abdomen of Drosophila. Expression of the BR isoforms during adult development of Drosophila suppressed bristle and hair formation when induced early or redirected cuticle production toward the pupal program when induced late. Expression of BR-Z1 at both of these times mimicked the effect of JH application but, unlike JH, it caused production of a new pupal cuticle on the head and thorax as well as on the abdomen. Consequently, the ‘status quo’ action of JH on the pupal-adult transformation is mediated by the JH-induced re-expression of BR.

CHANGES IN THE LIPID AND NITROGEN CONTENT DURING POSTEMBRYONIC DEVELOPMENT OF PSEUDALETIA UNIPUNCTA (LEPIDOPTER A: NOCTUIDAE)

1973 ◽  
Vol 105 (3) ◽  
pp. 471-478
Author(s):  
M. K. Mukerji ◽  
J. C. Guppy
Keyword(s):  
Weight Gain ◽  
Larval Development ◽  
Postembryonic Development ◽  
Matter Content ◽  
Dry Matter Content ◽  
Pseudaletia Unipuncta ◽  
Significant Difference ◽  
Adult Transformation ◽  
The Relationship ◽  
Accumulation Of Lipids

AbstractChanges were recorded in dry matter content and in the metabolism of lipids and nitrogen during the postembryonic development of Pseudaletia unipuncta (Haw.) on corn. The study revealed that 22 to 24% of the lipids were used during moulting and pupal–adult transformation and that nitrogen was not lost during such periods. The coefficient of apparent utilization of nitrogen remained more or less constant; however, that of lipids decreased with larval development. No significant difference was evident in the relationship between lipid consumption and weight gain, and nitrogen consumption and weight gain during larval development. A direct linear relationship was obtained between nitrogen and lipid utilization during all instars. In terms of heterauxesis, the accumulation of lipids during larval development was opposed to that of nitrogen.

scholarly journals Remodeling of the abdominal epithelial monolayer during the larva-pupa-adult transformation of Manduca

2018 ◽  
Vol 438 (1) ◽  
pp. 10-22 ◽  
Author(s):  
James B. Nardi ◽  
Charles Mark Bee ◽  
Catherine Lee Wallace
Keyword(s):  
Epithelial Monolayer ◽  
Adult Transformation
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