Results 151 to 160 of about 3,650 (207)
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Dimeric Ecdysteroid Analogues and Their Interaction with the Drosophila Ecdysteroid Receptor
Collection of Czechoslovak Chemical Communications, 2006Three structurally related specific ecdysteroid derivatives, 7,7'-dimers of 14-deoxy-8(14)-ene transformed 20-hydroxyecdysone, ponasterone A and ajugasterone C, were obtained by photochemical transformation. The structures of the dimeric ecdysteroids were identified mainly by NMR spectroscopy supported by MS and IR spectroscopy.
Juraj Harmatha +4 more
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Ecdysteroid biosynthesis in crayfish Y‐organs: Feedback regulation by circulating ecdysteroids
Archives of Insect Biochemistry and Physiology, 1999In crustaceans, ecdysteroid synthesis in the Y-organs is negatively regulated by the molt-inhibiting hormone (MIH). Reduction or cessation of MIH release from the sinus gland in the eyestalk, probably due to environmental cues, is one of possibly several signals for an increase of edysteroid production and subsequently enhancement of 20-hydroxyecdysone
, Dell +3 more
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Ecdysteroid metabolism in crustaceans
The Journal of Steroid Biochemistry and Molecular Biology, 2011The molting gland, or Y-organ (YO), is the primary site for ecdysteroid synthesis in decapod crustaceans. Ecdysteroid biosynthesis is divided into two stages: (1) conversion of cholesterol to 5β-diketol and (2) conversion of 5β-diketol to secreted products.
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Ecdysteroids and Ecdysteroid Signaling Pathways During Insect Oogenesis
2009During insect oogenesis, the oocyte acquires nutrients and genetic determinants to support embryonic development (previtellogenesis and vitellogenesis) and subsequently becomes surrounded by a protective eggshell (choriogenesis). In many insects, ecdysteroids are synthesized during ovarian growth which is often followed by the accumulation of ...
Luc Swevers, Kostas Iatrou
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Ecdysteroid Chemistry and Biochemistry
2005Ecdysteroids are arthropod steroid hormones controlling development and reproduction. Their main representative is 20-hydroxyecdysone synthesized from cholesterol, but some species produce slightly different molecules using phytosterols as starting material.
Lafont, René +3 more
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Invertebrate Reproduction & Development, 1990
Summary The steroid molting hormone of insects and other arthropods regulates gene activity in target tissues through its association with a specific, high affinity receptor protein. In this review we summarize recent advances in several areas of ecdysteroid receptor research, including efforts to characterize and purify the receptor protein ...
HANS J. BIDMON, TIMOTHY J. SLITER
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Summary The steroid molting hormone of insects and other arthropods regulates gene activity in target tissues through its association with a specific, high affinity receptor protein. In this review we summarize recent advances in several areas of ecdysteroid receptor research, including efforts to characterize and purify the receptor protein ...
HANS J. BIDMON, TIMOTHY J. SLITER
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New ecdysteroid and ecdysteroid glycosides from the roots of Serratula chinensis
Journal of Asian Natural Products Research, 2016Three new ecdysteroid glycosides (1-3) and one new ecdysteroid (4), were isolated from the roots of Serratula chinensis. Their structures were established on the basis of extensive spectroscopic analysis and chemical methods.
Zhang, Zi Yue +6 more
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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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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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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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