octadecadienoic acid/majs

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Transformations of alpha-linolenic acid in leaves of corn (Zea mays L.).

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Log ind / Tilmeld

Short incubation of [1-14C]alpha-linolenic acid with whole homogenate of leaves of corn (Zea mays L.) led to the formation of 4 major lipoxygenase products, i.e. 12-oxo-13-hydroxy-9(Z),15(Z)-octadecadienoic acid, 12-oxo-10,15(Z)-phytodienoic acid (12-oxo-PDA),

Fatty acid allene oxides. II. Formation of two macrolactones from 12,13(S)-epoxy-9(Z),11-octadecadienoic acid.

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Log ind / Tilmeld

An unstable fatty acid allene oxide, 12,13(S)-epoxy-9(Z),11-octadecadienoic acid, was recently identified as the product formed from 13(S)-hydroperoxy-9(Z), 11(E)-octadecadienoic acid in the presence of corn (Zea mays L.) hydroperoxide dehydrase (M. Hamberg (1987) Biochim. Biophys. Acta 920, 76-84).

Conjugated linoleic acid (9,11- and 10,12-octadecadienoic acid) is produced in conventional but not germ-free rats fed linoleic acid.

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Log ind / Tilmeld

Conjugated linoleic acid (CLA) is an anticarcinogen in several model animal systems. Conjugated linoleic acid occurs naturally in food and is present at higher concentrations in products from ruminant animals. Given that certain rumen microorganisms produce CLA from free linoleic acid, we studied

Incorporation into lipid classes of products from microsomal desaturation of isomeric trans-octadecenoic acids.

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Log ind / Tilmeld

The microsomal desaturation of positional isomers of trans-octadecenoic acids is effected by the delta 9-desaturase and, with concomitant geometric isomerization, cis,trans- and cis,cis-octadecadienoic acids of unusual structure are formed. Incorporation of the substrates and their products into

Allene oxide cyclase: a new enzyme in plant lipid metabolism.

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The mechanism of the biosynthesis of 12-oxo-10,15(Z)-phytodienoic acid (12-oxo-PDA) from 13(S)-hydroperoxy-9(Z),11(E),15(Z)-octadecatrienoic acid in preparations of corn (Zea mays L.) was studied. In the initial reaction the hydroperoxide was converted into an unstable allene oxide,

Trans-vaccenic acid is desaturated to conjugated linoleic acid in mice.

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Log ind / Tilmeld

Mice were fed pure trans11 octadecenoic acid (trans-vaccenic acid; TVA) to determine whether it is desaturated to cis9, trans11 octadecadienoic acid, a predominant isomer of conjugated linoleic acid (CLA). In a preliminary trial, 12% of the TVA consumed during a 2-wk feeding period was recovered in

Method to produce 9(S)-hydroperoxides of linoleic and linolenic acids by maize lipoxygenase.

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Log ind / Tilmeld

Seed from maize (corn) Zea mays provides a ready source of 9-lipoxygenase that oxidizes linoleic acid and linolenic acid into 9(S)-hydroperoxy-10(E),12(Z)-octadecadienoic acid and 9(S)-hydroperoxy-10(E),12(Z),15(Z)-octadecatrienoic acid, respectively. Corn seed has a very active

Levels of oxygenated Fatty acids in young corn and sunflower plants.

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Log ind / Tilmeld

Three oxygenated unsaturated fatty acids were investigated to determine whether they were present in seedlings of corn (Zea mays L. cv. NK PX443) and sunflower (Helianthus annuus L. cv. Sundak). The three compounds, 13-hydroxy-12-oxo-cis-9-octadecenoic acid (I), 13-hydroxy-12-oxo-cis,cis-9,

OXYLIPINS OTHER THAN JASMONIC ACID ARE XYLEM-RESIDENT SIGNALS REGULATING SYSTEMIC RESISTANCE INDUCED BY TRICHODERMA VIRENS IN MAIZE.

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Log ind / Tilmeld

While multiple long-distance signals were identified for pathogen-induced systemic acquired resistance (SAR), mobile signals for symbiont-induced systemic resistance (ISR) are less understood. We used ISR-positive and -negative mutants of both maize (Zea mays) and the beneficial fungus Trichoderma

Purification and Characterization of Allene Oxide Cyclase from Dry Corn Seeds.

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Log ind / Tilmeld

Allene oxide cyclase (AOC; EC 5.3.99.6) catalyzes the cyclization of 12,13(S)-epoxy-9(Z),11,15(Z)-octadecatrienoic acid to 12-oxo- 10,15(Z)-phytodienoic acid, the precursor of jasmonic acid (JA). This soluble enzyme was purified 2000-fold from dry corn (Zea mays L.) kernels to apparent homogeneity.

Biosynthesis of 12-oxo-10,15(Z)-phytodienoic acid: identification of an allene oxide cyclase.

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Log ind / Tilmeld

Incubation of 13(S)-hydroperoxy-9(Z),11(E),15(Z)-octadecatrienoic acid with corn (Zea mays L.) hydroperoxide dehydrase led to the formation of an unstable allene oxide derivative, 12,13(S)-epoxy-9(Z),11,15(Z)-octadecatrienoic acid. Further conversion of the allene oxide yielded two major products,

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