Results 141 to 150 of about 7,548 (219)
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Steroids, 2012
Catalytic hydrogenation is extensively used in steroid chemistry. The interest in transformations to the steroid skeleton of ecdysteroids has been increasing in the past years. Essential interest in the chemistry of ecdysteroids is caused by the selective reduction of Δ7 bond with the formation of 7,8-dihydro analogues, because this process allows one ...
Rimma G, Savchenko, Victor N, Odinokov
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Catalytic hydrogenation is extensively used in steroid chemistry. The interest in transformations to the steroid skeleton of ecdysteroids has been increasing in the past years. Essential interest in the chemistry of ecdysteroids is caused by the selective reduction of Δ7 bond with the formation of 7,8-dihydro analogues, because this process allows one ...
Rimma G, Savchenko, Victor N, Odinokov
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Journal of Separation Science, 2018
The review presents general principles for choosing optimal conditions for ecdysteroid separation, identification, and isolation using HPLC/TLC techniques in RP, NP-HILIC or NP modes. Analytics of ecdyteroids pose a still insufficiently resolved problem.
Joanna Głazowska +2 more
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The review presents general principles for choosing optimal conditions for ecdysteroid separation, identification, and isolation using HPLC/TLC techniques in RP, NP-HILIC or NP modes. Analytics of ecdyteroids pose a still insufficiently resolved problem.
Joanna Głazowska +2 more
semanticscholar +1 more source
An extensive ecdysteroid CoMFA
Journal of Computer-Aided Molecular Design, 1999The ecdysteroid agonist activity of 71 HPLC-purified ecdysteroids was measured in the Drosophila melanogaster BII tumorous blood cell line assay. The resultant log(ED50) values, spanning almost 6 orders of magnitude, were used to construct a comparative molecular field analysis (CoMFA) model in which conformations were selected by homology to the ...
Laurence Dinan +2 more
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Cellular and Molecular Life Sciences, 2009
Several reviews devoted to various aspects of ecdysone research have been published during the last few years. Therefore, this article concentrates mainly on the considerable progress in ecdysone research observed recently, and will cover the results obtained during the last 2 years.
Klaus-Dieter, Spindler +5 more
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Several reviews devoted to various aspects of ecdysone research have been published during the last few years. Therefore, this article concentrates mainly on the considerable progress in ecdysone research observed recently, and will cover the results obtained during the last 2 years.
Klaus-Dieter, Spindler +5 more
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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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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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