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Showing papers by "Tom J. Mabry published in 1975"


Book ChapterDOI
01 Jan 1975
TL;DR: A number of reviews of ultraviolet and visible absorption spectroscopy have appeared in the past (Jurd, 1962; Mabry et al., 1970; Swain, 1965; MABry, 1969; Harborne, 1963) as discussed by the authors.
Abstract: A number of reviews of ultraviolet and visible absorption spectroscopy have appeared in the past (Jurd, 1962; Mabry et al., 1970; Swain, 1965; Mabry, 1969; Harborne, 1963) the most comprehensive being those of Jurd (1962) and Mabry et al., (1970). The article by Jurd summarizes the work in this field up to about 1960 and gives detailed references to the original spectroscopic work carried out with flavonoids. The book by Mabry et al (1970) updates Jurd’s chapter and in addition provides a detailed catalogue of the ultraviolet (UV) spectra of 175 flavonoids together with comprehensive data on reagent induced shifts for each flavonoid. The present article includes some of the more significant aspects of the earlier reviews and in addition brings them up to date.

145 citations


Book ChapterDOI
01 Jan 1975
TL;DR: The electron impact mass spectrometer has been applied successfully to all classes of aglycones and more recently to a number of different types of glycosides including mono-and di-C-glycosylflavones and mono-to- tetra-O-Glycosides as discussed by the authors.
Abstract: Electron impact mass spectrometry of both flavonoid aglycones and glycosides serves as a valuable aid in determining their structures, especially when only very small quantities (1.e. less than 1 mg) of the compounds are available. It has been applied successfully to all classes of flavonoid aglycones (Porter and Baldas, 1971) and more recently to a number of different types of glycosides including mono- and di-C-glycosylflavones and mono- to tetra-O-glycosides. In contrast, chemical ionization (CI), using methane as the reactant gas, has only been applied to a few aglycones and gives few diagnostic fragments except for flavanones and dihydroflavonols (Kingston and Fales, 1973); therefore, this account will be largely restricted to electron impact mass spectrometry of flavonoids.

78 citations


Journal ArticleDOI
TL;DR: Systematic and evolutionary interpretations based upon the distributional data for 27 flavonoids from 39 species and 9 sesquiterpene lactones from 38 species are presented for species of Vernonia mostly from the New World.

56 citations


Journal ArticleDOI
TL;DR: Two new flavonols, 5,7,4′-trihydroxy-3,6,8,3′-tetramethoxyflavone and quercetagetin 3,5, 6, 3′-Tetramethyl ether, were identified in leaves of Chrysothamnus viscidiflorus as discussed by the authors.

27 citations


Journal ArticleDOI
TL;DR: In this paper, ten glycosides of kaempferol and quercetin from Equisetum silvaticum L. have been isolated from the same species, including 3 rutinoside-7 rhamnosides.

27 citations


Journal ArticleDOI
TL;DR: Two chemically distinct golden-yellow flavonoid exudates occur on the underside of fronds of Pityrogramma triangularis : ceroptin and a newly described flavonol, 6-methyl-8-methoxy-3,5,7-trihydroxyflavone.

26 citations


Journal ArticleDOI
TL;DR: The absence of hinokiflavone and its derivatives clearly distinguish the Zamiaceae from the Cycadaceae and Stangeriaceae and the complete absence of biflavanoids in the latter family suggests an advanced evolutionary condition.

25 citations


Journal ArticleDOI
TL;DR: The discovery of anthocyanins (and no betalains) along with S-type sieve-element plastids in Theligonum cynocrambe supports the exclusion of this taxon from the order Centrospermae.

22 citations


Journal ArticleDOI
TL;DR: Morphologically diverse plants in a wild population of Xanthium strumarium in eastern Texas produced widely variant combinations of sesquiterpene lactones, probably resulted from the natural hybridization of morphological complexes that originally were spatially isolated.

21 citations



Journal ArticleDOI
TL;DR: The sesquiterpenoid data suggest that the various taxa in the “strumarium” morphological complex can be divided into three groups: X. strumarium ( sensu stricto ) and X. indicum Konig, containing primarily or exclusively xanthinosin; (b) X. inaequilaterum DC.

Journal ArticleDOI
01 Oct 1975-Botany
TL;DR: Three genera, Ceraria, Portulacaria, and Talinella, cannot be distinguished from members of the Basellaceae on the basis of plastid subtypes since the two families have identical subtypes; however, the data do confirm their alignment with thePortulacaceae–Basellaceae family group.
Abstract: The presence of specific P-type sieve-element plastids is reported for 16 and betalains for 14 species of Portulacaceae. The micromorphology of sieve-element plastids and the presence of betalains ...


Journal ArticleDOI
TL;DR: Analysis of flavonoid distributional data from detailed biochemical systematic investigations of baptisia and Thermopsis species supports the contention that the two genera are closely related with Baptisia being the more advanced evolutionarily and exhibiting greater evolutionary vigor.

Journal ArticleDOI
TL;DR: The presence of a single chemical race was established, since all specimens from the Texas Gulf coast populations were uniform in their chemistry and leaf morphology, and chemically identical to the plant material from Argentina, however, the Argentina material exhibited slight morphological differences in that the leaves possessed less pubescence than theTexas Gulf coast plants.