Results 211 to 220 of about 40,889 (265)

Robber Barons of the C21

New Electronics, 2021
DESPITE RECORD SALES AMAZON DOESN’T HAVE TO PAY ANY CORPORATION TAX. ISN’T IT TIME WE LOOKED AT TAX REFORM?
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Synthesis of the C1−C21 (C1‘-C21‘) Fragment of the Dimeric Polyketide Natural Product SCH 351448

Organic Letters, 2002
[structure: see text] A convergent, stereoselective assembly of the C1-C21 (C1'-C21') fragment of SCH 351448, a 28-membered bis-lactone natural product, has been developed. A highly efficient approach to this fragment assembles 75% of the carbon skeleton and all the stereochemical elements present in the natural product.
Ashoke, Bhattacharjee   +2 more
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Electronic spectra of long odd-number carbon chains C17–C21 and C13−–C21−

Chemical Physics Letters, 1999
Abstract Electronic transitions of the odd-number neutral and anionic carbon chains C2n+1 (n=8–10) and C2n+1− (n=6–10) have been observed in a neon matrix at 6 K after co-deposition with laser-vaporized graphite. The assignments are based on a comparison with the previously identified electronic transition of C7 to C15 and C5− to C11−, and the ...
Muriel Wyss   +2 more
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C21 steroids from the roots of Marsdenia tenacissima

Phytochemistry, 2023
A phytochemical investigation of the dichloromethane soluble fraction of the ethanolic extract obtained from the roots of Marsdenia tenacissima led to the discovery of the sixteen undescribed pregnane C21 steroids (1-16) and isolation of eleven known C21 steroidal analogues (17-27).
Jin-Ling, Liu   +7 more
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ChemInform Abstract: Synthesis of the C11—C21 and C13—C21 Fragments of Epothilones from D‐Glucose.

ChemInform, 2001
AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
Hyo Won Lee   +2 more
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C21-Steroide

1962
Aus peripherem menschlichem Blutplasma liesen sich bisher nachstehende C21-Steroide mittels organischer Losungsmittel extrahieren und ausreichend identifizieren : 4-Pregnen-11 β, 17 α, 21 -triol-3,20-dion (Cortisol) [173], 4-Pregnen-11 β, 21-diol-3,20-dion (Corticosteron) [102, 174], 4-Pregnen-11 β, 21-diol-3,20-dion-18-al (Aldosteron) [
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Production of C21 steroids in rat fetal ovaries

Journal of Steroid Biochemistry, 1988
Female gonads of fetal and neonatal rats were cultured for 24 h in medium 199 supplemented with dibutyryl cyclic AMP (dcAMP), cycloheximide, spironolactone (an inhibitor of 17 alpha-hydroxylase) or hydroxylated cholesterol derivatives. Radioimmunoassays of pregnenolone (P5) and progesterone (P4) were performed in the media.
V, Rouiller, M N, Gangnerau, R, Picon
openaire   +2 more sources

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