Results 91 to 100 of about 142,128 (121)

Cytosolic and nuclear receptors for juvenile hormone in fat bodies of Leucophaea maderae

Insect Biochemistry, 1987
Abstract Cytosol preparations of fat bodies from adult Leucophaea maderae contained a population of very high affinity JH binding compounds (Kd of 10−9 M) which was only identifiable by the dextrancoated charcoal assay. These compounds exhibited a 1.5 times higher affinity to the natural enantiomer (10R-JH III) than to the racemate.
Franz Engelmann, Jaroslava Mala, Stephen S. Tobe   +2 more
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Thymidine kinase from ovaries of the cockroach Leucophaea maderae: Regulation by juvenile hormone

Insect Biochemistry, 1984
Abstract Thymidine kinase (TK) (ATP: thymidine-5′-phosphotransferase, EC 2.7.1.75) was characterized in ovarian extracts from the cockroach Leucophaea maderae. TK activity was localized in the follicular epithelium surrounding the terminal oocyte, and subcellular fractionation studies indicated that TK was a cytosolic enzyme. Optimal assay conditions
Margot C. LaPointe, J.K. Koeppe
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Photoaffinity Labelling of Juvenile Hormone-Binding Proteins in Leucophaea maderae

1984
Juvenile hormone (JH) binding proteins have been identified in tissues from several insect species [1–3]. In the adult female cockroach Leucophaea maderae, JH-binding proteins have been found in the fat body [4], ovaries [5], and hemolymph [4,5]. Although some properties of these binding proteins have been described, further characterization has been ...
J. K. Koeppe, G. E. Kovalick, G. D. Prestwich   +2 more
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The juvenile hormone receptor of the cockroach Leucophaea maderae

Insect Biochemistry and Molecular Biology, 1995
The juvenile hormone (JH) receptor has been isolated and purified from fat bodies of females and males of Leucophaea maderae. The sequence of procedures that yielded an apparently pure compound involved ammonium sulfate precipitation (20-60% saturation cut), DEAE anion exchange column chromatography, and polyacrylamide gel electrophoresis.
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Juvenile hormone regulation of structural changes and DNA synthesis in the follicular epithelium of Leucophaea maderae

Journal of Insect Physiology, 1980
Abstract Juvenile hormone (JH I) stimulates specific morphological and biochemical changes in the follicular epithelium surrounding the terminal oocytes in Leucophaea maderae . These include extracellular and intracellular structural changes, increased rates of follicle cell DNA synthesis, and elevated follicle cell DNA concentrations.
John K. Koeppe, Ken Hobson, Susan E. Wellman   +2 more
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Synthesis and secretion of a precursor hemolymph juvenile hormone-binding protein in the adult female cockroach Leucophaea maderae

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, Richard C. Rayne, Mary D. Shearin, Deborah J. Carver, Eric A. Whitsel, Robert C. Vogler   +5 more
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The cockroach Leucophaea maderae needs more than juvenile hormone, vitellogenin and reserves to make a yolky egg

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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Juvenile hormone‐binding protein and juvenile hormone esterase activity in hemolymph from last‐instar nymphs of Leucophaea maderae

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, Jaroslava Mala, David Borst   +2 more
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Photoaffinity labelling of juvenile hormone binding proteins in the cockroach Leucophaeamaderae

Biochemical and Biophysical Research Communications, 1982
Abstract 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, G E, Kovalick, J K, Koeppe   +2 more
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Structure, haemolymph titre, and regulatory effects of juvenile homone during ovarian maturation in Leucophaea maderae

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, Stephen G. Brantley, Mary M. Nijhout   +2 more
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