Author
Tom J. Mabry
Other affiliations: University of Illinois at Urbana–Champaign, Minia University, Dicle University ...read more
Bio: Tom J. Mabry is an academic researcher from University of Texas at Austin. The author has contributed to research in topics: Kaempferol & Sesquiterpene lactone. The author has an hindex of 42, co-authored 459 publications receiving 13375 citations. Previous affiliations of Tom J. Mabry include University of Illinois at Urbana–Champaign & Minia University.
Topics: Kaempferol, Sesquiterpene lactone, Germacranolide, Flavones, Hymenoxys
Papers published on a yearly basis
Papers
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TL;DR: It is suggested that the betalain and anthocyanin families developed from a common ancestor at a time prior to the widespread occurrence of floral pigments in angiosperms.
Abstract: The structural types, biogenesis and distribution of betalains and anthocyanins in centrospermous families are reviewed. The implications of the pigment and DNA-RNA hybridization data, along with other evidence, are discussed with respect to the view that the evolutionary line of centrospermous families contains eleven basic or core families of which nine produce betalains and two, theCaryophyllaceae andMolluginaceae, produce anthocyanins; it is suggested that the betalain and anthocyanin families developed from a common ancestor at a time prior to the widespread occurrence of floral pigments in angiosperms.
38 citations
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TL;DR: A population of Helianthus maximiliani from south-central Texas was shown to have a sesquiterpene lactone chemistry which was completely different from that reported for collections of this species from Kansas and north- central Texas.
38 citations
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TL;DR: Chloroplast DNA restriction site variation was studied in 31 New World species ofIpomoea, representing a majority of the New World sections and series within the genus, and refinements of existing classification schemes are proposed.
Abstract: Chloroplast DNA restriction site variation was studied in 31 New World species ofIpomoea, representing a majority of the New World sections and series within the genus. Using 14 endonucleases, a total of 124 phylogenetically informative restriction sites was detected. Dollo parsimony, Wagner parsimony, and bootstrap methods were employed to construct phylogenetic trees and evaluate confidence intervals of monophyletic groups. With a few exceptions, groups circumscribed on the basis of morphological variation are in agreement with groupings based on restriction site variation. Relationships between subgeneric groupings, however, disagree substantially with those proposed in the past. Although conflicting hypotheses for some intersectional relationships are not presently resolvable, cpDNA restriction site analyses propose the following refinements of existing classification schemes.Ipomoea ser.Setosae is divided into distantly related groups, as is sect.Pharbitis. SeriesTyrianthinae, a proposed segregate of sect.Pharbitis, is associated with sect.Calonyction and the Tricolor complex (subg.Quamoclit).Ipomoea sect.Batatas is segregated from other herbaceous groups of the heterogeneous subg.Quamoclit sensu lato and aligned as a derivative ofI. setosa, subg.Eriospermum. To test for homology of key characters weighted in traditional schemes, morphological features were studied with respect to their distribution on lineages defined by restriction site data. Characters such as setose sepals, foliose-pubescent sepals, and erect growth habit, among others, are interpreted as having multiple origins, while 3-locular ovaries, 4-locular ovaries, and long-haired seeds have evolved only once.
38 citations
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TL;DR: Six known terpenoids were isolated from the leaves of Salvia palaestina and were identified by spectral data, and sclareol showed high activity against Staphylococcus aureus, S. epidermis, Escherichia coli, Proteus vulgaris and Pseudomonas aeruginosa.
36 citations
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TL;DR: The factors underlying the influence of the different classes of polyphenols in enhancing their resistance to oxidation are discussed and support the contention that the partition coefficients of the flavonoids as well as their rates of reaction with the relevant radicals define the antioxidant activities in the lipophilic phase.
8,513 citations
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TL;DR: A revised and updated classification for the families of the flowering plants is provided in this paper, which includes Austrobaileyales, Canellales, Gunnerales, Crossosomatales and Celastrales.
7,299 citations
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TL;DR: Western medicine has not yet used flavonoids therapeutically, even though their safety record is exceptional, and suggestions are made where such possibilities may be worth pursuing.
Abstract: Flavonoids are nearly ubiquitous in plants and are recognized as the pigments responsible for the colors of leaves, especially in autumn. They are rich in seeds, citrus fruits, olive oil, tea, and red wine. They are low molecular weight compounds composed of a three-ring structure with various substitutions. This basic structure is shared by tocopherols (vitamin E). Flavonoids can be subdivided according to the presence of an oxy group at position 4, a double bond between carbon atoms 2 and 3, or a hydroxyl group in position 3 of the C (middle) ring. These characteristics appear to also be required for best activity, especially antioxidant and antiproliferative, in the systems studied. The particular hydroxylation pattern of the B ring of the flavonoles increases their activities, especially in inhibition of mast cell secretion. Certain plants and spices containing flavonoids have been used for thousands of years in traditional Eastern medicine. In spite of the voluminous literature available, however, Western medicine has not yet used flavonoids therapeutically, even though their safety record is exceptional. Suggestions are made where such possibilities may be worth pursuing.
4,663 citations
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TL;DR: In this article, two complementary colorimetric methods, aluminum chloride method and 2,4-dini trophenylhydrazine method, were used to determine the real content of total flavonoids in propolis.
3,899 citations
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TL;DR: Several high-quality investigations have examined the relationship between flavonoid structure and antibacterial activity and these are in close agreement, and future studies may allow the development of a pharmacologically acceptable antimicrobial agent or class of agents.
3,630 citations