Results 121 to 130 of about 18,562 (160)
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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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Parasitology Today, 1990
The occurrence of ecdysteroids (insect moulting hormones) in nematodes, albeit at low concentrations, has been firmly established. In addition to apparently stimulating moulting in a few species, exogenously applied ecdysteroids have now been shown to have interesting biological effects on meiotic reinitiation in oocytes and on microfilarial production
G C, Barker, H H, Rees
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The occurrence of ecdysteroids (insect moulting hormones) in nematodes, albeit at low concentrations, has been firmly established. In addition to apparently stimulating moulting in a few species, exogenously applied ecdysteroids have now been shown to have interesting biological effects on meiotic reinitiation in oocytes and on microfilarial production
G C, Barker, H H, Rees
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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 ...
L, Dinan, R E, Hormann, T, Fujimoto
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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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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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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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Experientia, 1979
Free ecdysteroids were extracted from intermolt and premolt larvae ofLimulus polyphemus in the first posthatch stage, purified by TLC and HRLC, and assayed by RIA and theLimulus bioassay 20-hydroxyecdysone appears to be a principal ecdysteroid and occurs at least 3 times higher a concentration in premolt vs intermolt animals.
T. C. Jegla, J. D. Costlow
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Free ecdysteroids were extracted from intermolt and premolt larvae ofLimulus polyphemus in the first posthatch stage, purified by TLC and HRLC, and assayed by RIA and theLimulus bioassay 20-hydroxyecdysone appears to be a principal ecdysteroid and occurs at least 3 times higher a concentration in premolt vs intermolt animals.
T. C. Jegla, J. D. Costlow
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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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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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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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