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  1. No Access

    Article

    Transesterification of juvenile hormone occurs in vivo in locust when injected in alcoholic solvents

    Catabolism of juvenile hormone was studied in vivo in the African locust by injection of the labelled natural enantiomer (10R) (12-3H) JH-III. Due to the poor solubility of JH in aqueous solution, it was injected...

    S. Debernard, F. Rossignol, C. Malosse, B. Mauchamp, F. Couillaud in Experientia (1995)

  2. No Access

    Article

    Effects of a juvenile hormone mimetic, fenoxycarb, on post-embryonic development of the European corn borer,Ostrinia nubilalis Hbn.

    The effect of a juvenile hormone mimetic, fenoxycarb, Ro 13-5223, was tested on the larval instars of the European corn borer,Ostrinia nubilalis, by dip** or topical application. When larvae were treated in ins...

    C. Gadenne, S. Grenier, G. Plantevin, B. Mauchamp in Experientia (1990)

  3. No Access

    Article

    In vitro biosynthesis of juvenile hormone III by the corpora allata ofCalliphora vomitoria and its role in ovarian maturation and sexual receptivity

    JH III is the only JH detected by GLC-MS in medium from in vitro incubations of corpora allata of adult females ofCalliphora vomitoria. When corpora allata were removed from females at various times during the re...

    M. Trabalon, M. Campan, J. C. Baehr, B. Mauchamp in Experientia (1987)

  4. No Access

    Chapter

    Chitin biosynthesis after treatment with benzoylphenyl ureas

    Benzoylphenyl ureas such as diflubenzuron and its analogs, are very effective in controlling a broad spectrum of insect pests. This class of chemicals are primarily stomach toxicants of larvae (Wellinga et al....

    B. Mauchamp, O. Perrineau in Chitin and Benzoylphenyl Ureas (1987)

  5. No Access

    Chapter

    Biosynthesis of Chitin by Insect Epidermal Cells: Effect of Benzoylphenylureas

    Insect epidermal cells derived from ektoderm, are involved in the main physiological functions. They are covered by a continuous secretion : the cuticle. The epidermal cell layer and the cuticle constitute the...

    B. Mauchamp, E. Caminade in Chitin in Nature and Technology (1986)

  6. No Access

    Chapter

    Characterization of the Insect Cuticle Layers by Laser Raman Spectrometry

    Raman spectrometry allows to characterize all kinds of molecules by vibrational spectra. Laser is used as a light excitation source and a monochromator and recording system analyse scattered light for frequenc...

    M. Truchet, B. Mauchamp in Chitin in Nature and Technology (1986)

  7. No Access

    Article

    Regulation of juvenile hormone titer in African locust

    In the African locust, the titer of C-16 JH in hemolymph (determined by GC-MS), reflects the rate of hormone biosynthesis (determined by RCA) in normal adult females. Severance of the nervi corporis allati-I (...

    F. Couillaud, B. Mauchamp, A. Girardie in Experientia (1985)

  8. No Access

    Article

    Ecdysis inhibition inAcrolepiopsis assectella larvae by digitonin: antagonistic effects of cholesterol

    Digitonin has a toxic effect onAcrolepiopsis assectella, inhibiting development and molting of young larvae fed on a semi-synthetic diet. This effect depends on concentration. It does not occur when cholesterol i...

    C. Arnault, B. Mauchamp in Experientia (1985)

  9. No Access

    Chapter and Conference Paper

    The Qualitative and Quantitative Determination of Juvenile Hormones by Mass Spectrometry

    In order to understand the endocrinology regulation of insect morphogenesis and reproduction, an accurate and precise method of measuring juvenile hormone (JH) titers at different stages of the insect life cyc...

    B. Mauchamp, M. Zander, R. Wolff in Biosynthesis, Metabolism and Mode of Actio… (1984)

  10. No Access

    Article

    The epidermal cell cycle during the last larval instar ofPieris brassicae (Lepidoptera)

    Various experimental procedures have been used to analyze the hormonal controls of ommochrome content inPieris epidermis. They include topical application of JH I, ligation at various ages (associated with 20-OH ...

    P. Beydon, B. Mauchamp, J. Lhonoré, A. Bouthier… in Journal of comparative physiology (1980)

  11. No Access

    Article

    Endocrine significance of critical periods during insect development: Analysis of ligation experiments withPieris brassicae last instar larvae

    Ecdysone haemolymph levels have been analyzed in neck- or thorax-ligatedPieris larvae in order to explain the physiological significance of critical periods. It appeared that head critical period corresponds to a...

    R. Lafont, B. Mauchamp, J. -L. Pennetier, M. L. De Reggi in Experientia (1977)

  12. No Access

    Article

    α- andβ-ecdysone levels in insect haemolymph: Correlation with developmental events

    Les taux d'α-et de β-ecdysone ont été déterminés dans l'hémolymphe dePieris brassicae au cours du dernier stade larvaire et de la métamorphose. Parallèlement, les taux de synthése d'ADN, d'ARN et de protéines ont...

    R. Lafont, B. Mauchamp, J. L. Pennetier, P. Tarroux, L. de Hys… in Experientia (1975)