1,721,075 research outputs found
Incorporation of 5α-furostan-3β,26-diol into tigogenin by digitalis lanata
No full text2,2′,4,4′-3H4-dihydrotigogenin was converted by Digitalis lanata plants into tigogenin
The role of C-15 in the biosynthesis of digitoxigenin
No full textThe 15-position of pregnane-type precursors is not involved in the 14β-hydroxylation process during the biosynthesis of digitoxigenin
Stereochemistry of reduction of the 24,25-double bond in the biosynthesis of tigogenin in digitalis lanata
No full textIn tigogenin [(25R)-5α-spirostan-3β-ol] biosynthesized in Digitalis lanata a 4-pro-R-proton of mevalonic acid occupies the 24-pro-S-position, which indicates that reduction of Δ24-biosynthetic intermediates occurs with trans-stereochemistry
Stereospecific introduction of a 24-pro-R-hydrogen in the biosynthesis of tigogenin in Digitalis lanata
No full textIn tigogenin biosynthesized in Digitalis lanata a 4-pro-R-hydrogen of mevalonic acid (MVA) occupies the 24-pro-S-position
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Fate of the 16β-hydrogen atom of cholesterol in the biosynthesis of tomatidine and solanidine
No full textDuring the biosynthesis of tomatidine (1) in Lycopersicon pimpinellifolium, the 16β-hydrogen atom of cholesterol is inverted to the 16α-position; the same hydrogen atom is lost during the biosynthesis of solanidine (2) in Solanum tuberosum
2,3-Dihydroxybenzoate pathway in Pseudomonas putida. 1H n.m.r. study on the ring-cleavage site
No full text1. Ring cleavage of 2,3-dihydroxybenzoate by cell-free extracts of Pseudomonas putida leads to 2-hydroxy-6-oxo-(2Z,4E)-hexa-2,4-dienoic acid and CO2. 2. The 1H n.m.r. spectrum of the ring-fission product obtained in a 2H2O solution suggests that the extra-diol cleavage occurs between C-3 and C-4
UNUSUAL PHOTOCHEMICAL BEHAVIOR OF THE ENONE CHROMOPHORE OF THE INSECT MOLTING HORMONE 20-ALPHA-HYDROXYECDYSONE
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