Results 91 to 100 of about 357 (119)
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Insect Biochemistry, 1988
Abstract Hemolymph juvenile hormone-binding protein (JHBP) is synthesized and secreted from fat body in the adult female cockroach, Leucophaea maderae . The data in this paper suggest it is initially secreted from the fat body as a larger peptide whereas data in the accompanying paper demonstrate that JHBP is apolipophorin I.
John K. Koeppe +5 more
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Abstract Hemolymph juvenile hormone-binding protein (JHBP) is synthesized and secreted from fat body in the adult female cockroach, Leucophaea maderae . The data in this paper suggest it is initially secreted from the fat body as a larger peptide whereas data in the accompanying paper demonstrate that JHBP is apolipophorin I.
John K. Koeppe +5 more
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Journal of Insect Physiology, 2005
For the cockroach Leucophaea maderae the developmental profile of lipophorin (Lp) concentrations in the hemolymph was determined through the entire vitellogenic period. At mid-vitellogenesis the concentrations of Lp had risen to 6 times the level at emergence and then declined to 2/3 of such high values at ovulation. The racemic 10R,10S-JH-III bound to
Franz, Engelmann, Jaroslava, Mala
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For the cockroach Leucophaea maderae the developmental profile of lipophorin (Lp) concentrations in the hemolymph was determined through the entire vitellogenic period. At mid-vitellogenesis the concentrations of Lp had risen to 6 times the level at emergence and then declined to 2/3 of such high values at ovulation. The racemic 10R,10S-JH-III bound to
Franz, Engelmann, Jaroslava, Mala
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Archives of Insect Biochemistry and Physiology, 1988
AbstractThe concentration of the juvenile hormone‐binding protein (JHB) in hemolymph was determined throughout the last nymphal instar. It was found to be 3.9 μM at the molt to the instar, rising to 13 μM by mid‐instar, and dropping to 6.7μM the day before emergence.
Franz Engelmann +2 more
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AbstractThe concentration of the juvenile hormone‐binding protein (JHB) in hemolymph was determined throughout the last nymphal instar. It was found to be 3.9 μM at the molt to the instar, rising to 13 μM by mid‐instar, and dropping to 6.7μM the day before emergence.
Franz Engelmann +2 more
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Photoaffinity labelling of juvenile hormone binding proteins in the cockroach Leucophaeamaderae
Biochemical and Biophysical Research Communications, 1982Abstract The synthesis and testing of several diazocarbonyl JH analogs (diazo JHA) which act as photoaffinity labels for insect juvenile hormone binding proteins are described. The best competitor, 10,11-epoxyfarnesyl diazoacetate, has been shown to irreversibly reduce [3H]-JH III binding to both ovarian and hemolymph JHBP from Leucophaea maderae ...
G D, Prestwich +2 more
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Juvenile hormone-controlled synthesis of female-specific protein in the cockroach Leucophaea maderae
Archives of Biochemistry and Biophysics, 1971Application of 1 μg of the all-trans methyl (±)-12,14-dihomojuvenate induces the de novo synthesis of a female-specific protein at a rate similar to that found in unoperated egg-maturing females. JH also appears to stimulate an increased synthesis of the non-sex-specific proteins.
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Journal of Insect Physiology, 1980
Abstract Juvenile hormone (JH) synthesized and secreted in vitro by the corpora allata of mated adult Leucophaea maderae females was determined to be JH III (methyl-10,11-epoxy-3,7,11-trimethyl-2,6-dodecadienoate). The haemolymph titre of JH was determined during maturation of the terminal oocytes in the first reproductive cycle of L. maderae.
John K. Koeppe +2 more
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Abstract Juvenile hormone (JH) synthesized and secreted in vitro by the corpora allata of mated adult Leucophaea maderae females was determined to be JH III (methyl-10,11-epoxy-3,7,11-trimethyl-2,6-dodecadienoate). The haemolymph titre of JH was determined during maturation of the terminal oocytes in the first reproductive cycle of L. maderae.
John K. Koeppe +2 more
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Journal of Insect Physiology, 1980
Abstract Our research demonstrates that juvenile hormone (JH I) stimulates thymidine incorporation into ovarian follicle cell DNA in the ovoviviparous cockroach, Leucophaea maderae. A rapid, quantitative method for monitoring 3H-thymidine incorporation into ovarian DNA, in vitro, is described. Cultured ovarian tissue from L.
John K. Koeppe, Susan E. Wellman
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Abstract Our research demonstrates that juvenile hormone (JH I) stimulates thymidine incorporation into ovarian follicle cell DNA in the ovoviviparous cockroach, Leucophaea maderae. A rapid, quantitative method for monitoring 3H-thymidine incorporation into ovarian DNA, in vitro, is described. Cultured ovarian tissue from L.
John K. Koeppe, Susan E. Wellman
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1976
Despite the extensive research in recent years on insect juvenile hormone (JH), its mode of action at the molecular level is still not understood. One reason for this gap in our knowledge is that the usual morphological assays of JH action do not lend themselves readily to analysis by molecular biological tools. For this reason, we have chosen to study
J. K. Koeppe, J. Ofengand
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Despite the extensive research in recent years on insect juvenile hormone (JH), its mode of action at the molecular level is still not understood. One reason for this gap in our knowledge is that the usual morphological assays of JH action do not lend themselves readily to analysis by molecular biological tools. For this reason, we have chosen to study
J. K. Koeppe, J. Ofengand
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Journal of Insect Physiology, 1971
Abstract In Schistocerca vaga a female specific protein is present in the haemolymph during egg maturation. This protein is absent from the haemolymph before the start of ovarian development, in females allatectomized before the start of ovarian development, and in males of any age.
F. Engelmann, L. Hill, J.L. Wilkens
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Abstract In Schistocerca vaga a female specific protein is present in the haemolymph during egg maturation. This protein is absent from the haemolymph before the start of ovarian development, in females allatectomized before the start of ovarian development, and in males of any age.
F. Engelmann, L. Hill, J.L. Wilkens
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Developmental Biology, 1969
Abstract During the time that eggs are developing, the fat body from female Leucophaea maderae synthesizes a protein with characteristics similar to a subunit of the major yolk protein. Synthesis does not occur or is much reduced in fat bodies from males, nymphs, and abdomens amputated from adult females before the onset of egg development.
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Abstract During the time that eggs are developing, the fat body from female Leucophaea maderae synthesizes a protein with characteristics similar to a subunit of the major yolk protein. Synthesis does not occur or is much reduced in fat bodies from males, nymphs, and abdomens amputated from adult females before the onset of egg development.
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