Results 221 to 230 of about 14,789 (259)
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Biosynthesis of ecdysone and ecdysone phosphates in spinach
Phytochemistry, 1994Abstract The polar ecdysteroid conjugate, ecdysone phosphate (2β,3β,14α,22R,25-pentahydroxy-7-en-6-one-3- phosphate) was identified in excised first leaves of spinach, where it is endogenously produced during 20- hydroxyecdysone biosynthesis. Radiolabelled [14C]ecdysone phosphate was isolated from several excised leaf assays and was hydrolysed with ...
John H. Adler +2 more
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Ecdysone Analog: Conversion to Alpha Ecdysone and 20-Hydroxyecdysone by an Insect [PDF]
Science, 1969 The tritium-labeled synthetic ecdysone analog Δ 7 -5β-cholestene-2β,3β,14α-triol-6-one terminated diapause when injected into diapausing tobacco hornworm pupae and was converted into tritium-labeled α-ecdysone and tritium-labeled 20-hydroxyecdysone.
W. E. Robbins +3 more
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The FASEB Journal, 2020
The steroid hormone ecdysone is the central regulator of insect metamorphosis, during which a growing, immature larva is remodeled, through pupal stages, to a reproductive adult.
D. Lim +7 more
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The steroid hormone ecdysone is the central regulator of insect metamorphosis, during which a growing, immature larva is remodeled, through pupal stages, to a reproductive adult.
D. Lim +7 more
semanticscholar +1 more source
Conversion of α-Ecdysone to β-Ecdysone by Crustaceans and Insects
Nature, 1969SINCE Karlson1 isolated α-ecdysone from silkworm pupae, other workers have isolated and identified three more ecdysones—β-ecdysone (crustecdysone)2, 26-hydroxy-β-ecdysone3 and 2-deoxy-β-ecdysone4—in extracts of insects and crustaceans. Additional types of ecdysones will probably be described when other species of arthropods are closely examined, as ...
John B. Siddall, David S. King
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Nature, 1976
TICKS and insects develop and grow through intermittent replacement of their integument. This moulting does not occur beyond the adult stage, with the exception of primitive apterygote insects such as silverfish, which continue to moult and grow after they become sexually mature. Moulting ceases to occur in the pterygote adult insect because the glands
Thomas R. Odhiambo +2 more
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TICKS and insects develop and grow through intermittent replacement of their integument. This moulting does not occur beyond the adult stage, with the exception of primitive apterygote insects such as silverfish, which continue to moult and grow after they become sexually mature. Moulting ceases to occur in the pterygote adult insect because the glands
Thomas R. Odhiambo +2 more
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Ecdysone as A Hypocholesterolemic Agent
Archives Internationales de Physiologie et de Biochimie, 1969AbstractIt is well-known from the previous findings (Tomkins et al., 1953; Bucher et al., 1959 and 1960) that cholesterol inhibits its own synthesis by a negative feed-back control. Since then, bile salts and their conjugates in the enterohepatic circulation have been shown to be implicated in the regulation of cholesterol synthesis by a double feed ...
P. J. Lupien, K. D. Chaudhary, C. Hinse
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Gas chromatographic analysis of ecdysone
Experientia, 1970Nous avons developpe une methode d'analyse micro-quantitative de l'ecdysone (hormone de la mue des insectes) par Chromatographie gazeuse. Elle permettera l'analyse chimique de l'ecdysone, qui a ete dosee jusqu'a present par des methodes biologiques.
Maximiliano Javier Katz, Y. Lensky
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Effect of ecdysone and ecdysone analogues on two Balbiani rings of Acricotopus lucidus
Experimental Cell Research, 1972Abstract The activity of two Balbiani rings (BR-3, BR-4) in the salivary gland of Acricotopus lucidus is controlled by ecdysone. This result agrees with our former conclusion worked out by indirect methods [22]. The injection of ecdysone and ecdysone analogues (ecdysterone, inokosterone) into the last instar larvae led to an inactivation of BR-3 ...
R. Panitz, U. Wobus, E. Serfling
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On ecdysone-binding proteins and ecdysone-like material in nematodes
International Journal for Parasitology, 1977Abstract Homogenates of Panagrellus redivivus and extracts of P. redivivus, Aphelenchus avenae and Haemonchus contortus were examined for ecdysone-binding proteins and ecdysone-like material, respectively. Sucrose density-gradient centrifugation, polyacrylamide gel electrophoresis and charcoal-dextran-binding assay failed to detect ecdysone ...
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Hoppe-Seyler´s Zeitschrift für physiologische Chemie, 1978
The occurrence of the enzyme ecdysone oxidase was demonstrated in several insect species. In blowflies it was detected mainly in eggs and pupae. The enzyme activity in blowflies varies during development parallel to the ecdysteroid content. This suggests a specific but presently unknown function of the enzyme. Ecdysone oxidase was located mainly in the
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The occurrence of the enzyme ecdysone oxidase was demonstrated in several insect species. In blowflies it was detected mainly in eggs and pupae. The enzyme activity in blowflies varies during development parallel to the ecdysteroid content. This suggests a specific but presently unknown function of the enzyme. Ecdysone oxidase was located mainly in the
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