Results 151 to 160 of about 7,548 (219)
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1984
The epidermal cells of most annelid worms secrete a cuticle which consists of a mixture of proteins and sugars. The Hirudinea have been reported, more than a century ago [1], to molt, a process which is less conspicuous in other annelid worms, although it is regularly observed in species like the polychaete Nereis divenicolor.
M. Porchet +4 more
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The epidermal cells of most annelid worms secrete a cuticle which consists of a mixture of proteins and sugars. The Hirudinea have been reported, more than a century ago [1], to molt, a process which is less conspicuous in other annelid worms, although it is regularly observed in species like the polychaete Nereis divenicolor.
M. Porchet +4 more
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What Are the Origins of Ecdysteroids in Gastropods?
General and Comparative Endocrinology, 1995Terrestrial gastropods contain ecdysteroids, the origins of which are unknown. Whether they are synthesized by the animals or they arise from the diet is an open question. To address this problem, labeled cholesterol and various molecules which are efficiently converted into ecdysone by arthropods were tested as possible ecdysone precursors in ...
M, Garcia, B, Griffond, R, Lafont
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Ant Ecdysteroid Extraction and Radioimmunoassay
Cold Spring Harbor Protocols, 2009INTRODUCTIONEcdysteroids are a group of steroid compounds present in many plant and invertebrate species. In arthropods, they function primarily as hormones involved in the regulation of molting. This protocol describes how to extract ecdysteroid hormones from ant specimens and subsequently quantify circulating levels of the hormone. The hormone can be
Colin, Brent, Adam, Dolezal
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Species Specificity of Changes in Ecdysteroid Metabolism in Response to Ecdysteroid Agonists
Pesticide Biochemistry and Physiology, 2002Administration of the nonsteroidal ecdysteroid agonist RH-5849 or 20-hydroxyecdysone to final larval instar tobacco hornworm, Manduca sexta, has been shown to induce an ecdysteroid inactivation enzyme, ecdysteroid 26-hydroxylase, and the cytosolic inactivation enzymes ecdysone oxidase and ecdysteroid phosphotransferase.
Daryl R Williams +3 more
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A reappraisal of ecdysteroid binding in drosophila
Molecular and Cellular Endocrinology, 1983Ecdysteroid binding was investigated in Kc cells and larval fat body of Drosophila. After incubation of intact Kc cells, 200-300 specific binding sites were detected for both 20-OH ecdysone and ponasterone A. However, if cells were fractionated prior to incubation with 20-OH ecdysone, no specific binding was observed.
H, Gronemeyer, P, Harry, A, Alberga
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Ernährung & Medizin, 2023
Spätestens mit der Comic-Figur Popeye gilt Spinat als kraftbringend und leistungssteigernd. An seiner anabolen Wirkung scheint tatsächlich etwas dran zu sein. Im Fokus der Wissenschaft stehen die im Spinat enthaltenen Ecdysteroide.
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Spätestens mit der Comic-Figur Popeye gilt Spinat als kraftbringend und leistungssteigernd. An seiner anabolen Wirkung scheint tatsächlich etwas dran zu sein. Im Fokus der Wissenschaft stehen die im Spinat enthaltenen Ecdysteroide.
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Molecular and Cellular Endocrinology, 1988
A macromolecule with high affinity for the ecdysteroid analogue ponasterone A was isolated from nuclei of larvae of the blowfly Calliphora vicina. The ecdysteroid-binding molecule revealed characteristics of the moulting hormone receptor. It was sensitive towards protease but not towards nucleases.
M, Lehmann, J, Koolman
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A macromolecule with high affinity for the ecdysteroid analogue ponasterone A was isolated from nuclei of larvae of the blowfly Calliphora vicina. The ecdysteroid-binding molecule revealed characteristics of the moulting hormone receptor. It was sensitive towards protease but not towards nucleases.
M, Lehmann, J, Koolman
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1984
Helminths are medically and economically important parasites of many higher and lower animals. Several hundred million people, especially in countries of the third world, suffer from diseases caused by these parasites. Only a few representatives of the helminths will be mentioned here: the blood flukes, Schistosoma mansoni, S. haematobium, and S,
J. Koolman, J. Walter, H. Zahner
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Helminths are medically and economically important parasites of many higher and lower animals. Several hundred million people, especially in countries of the third world, suffer from diseases caused by these parasites. Only a few representatives of the helminths will be mentioned here: the blood flukes, Schistosoma mansoni, S. haematobium, and S,
J. Koolman, J. Walter, H. Zahner
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Insect Biochemistry and Molecular Biology, 2002
Total body ecdysteroid titers were determined at specific stages during the larval and nymphal life of Amblyomma americanum (L.). One ecdysteroid peak was observed following the completion of larval apolysis. However, two distinct ecdysteroid peaks occurred at a comparable stage in the nymphal molting cycle.
Melanie J, Palmer +4 more
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Total body ecdysteroid titers were determined at specific stages during the larval and nymphal life of Amblyomma americanum (L.). One ecdysteroid peak was observed following the completion of larval apolysis. However, two distinct ecdysteroid peaks occurred at a comparable stage in the nymphal molting cycle.
Melanie J, Palmer +4 more
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Stereoselective synthesis of 9α-hydroxylated ecdysteroids
Steroids, 2010Treatment of ecdysteroids with excess of TBAF in THF was shown to proceed with stereoselective oxidation at the 9alpha position of the carbon skeleton. The stereochemistry of the products was confirmed by X-ray analysis. Using this method, 9alpha-hydroxyecdysteroids were obtained in good yield.
Drach, S. +5 more
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