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cotyledon/triacylglycerol
L'enllaç es desa al porta-retalls
Pàgina 1 des de 26 resultats
The utilisation of fatty-acid substrates in triacylglycerol biosynthesis by tissue-slices of developing safflower (Carthamus tinctorius L.) and sunflower (Helianthus annuus L.) cotyledons.
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Developing cotyledons of safflower (Carthamus tinctorius L.) and sunflower (Helianthus annuus L.) readily utilised exogenously supplied (14)C-labelled fatty-acid substrates for the synthesis of triacylglycerols. The other major radioactive lipids were phosphatidylcholine and diacylglycerol. In
The interconversion of diacylglycerol and phosphatidylcholine during triacylglycerol production in microsomal preparations of developing cotyledons of safflower (Carthamus tinctorius L.).
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Microsomal preparations from the developing cotyledons of safflower (Carthamus tinctorius) catalyse the acylation of sn-glycerol 3-phosphate in the presence of acyl-CoA. Under these conditions the radioactive glycerol in sn-glycerol 3-phosphate accumulates in phosphatidic acid, phosphatidylcholine,
The regulation of the fatty-acid composition of the triacylglycerols in microsomal preparations from avocado mesocarp and the developing cotyledons of safflower.
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The utilisation of [(14)C]glycerol 3-phosphate and [(14)C]linoleoyl-CoA in the synthesis of triacylglycerol has been studied in the microsomal preparations of developing cotyledons of safflower seed. The results confirm that the glycerol backbone, which flows towards triacylglycerol from
The biosynthesis of triacylglycerols in microsomal preparations of developing cotyledons of sunflower (Helianthus annuus L.).
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The synthesis of triacylglycerols was investigated in microsomes (microsomal fractions) prepared from the developing cotyledons of sunflower (Helianthus annuus). Particular emphasis was placed on the mechanisms involved in controlling the C18- unsaturated-fatty-acid content of the oils. We have
Involvement of glyoxysomal lipase in the hydrolysis of storage triacylglycerols in the cotyledons of soybean seedlings.
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The total cotyledon extract of soybean (Glycine max [L.] Merr. var. Coker 136) seedlings underwent lipolysis as measured by the release of fatty acids. The highest lipolytic activity occurred at pH 9. This lipolytic activity was absent in the dry seeds and increased after germination concomitant
Diacylglycerol acyltransferase activity and triacylglycerol synthesis in germinating castor seed cotyledons.
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The central importance of storage lipid breakdown in providing carbon and energy during seed germination has been demonstrated by isolating the genes encoding the enzymes involved in FA beta-oxidation. In contrast, little is known about the ability of germinating seeds to synthesize TAG. We report
Evidence for the probable oil body association of a thiol-protease, leading to oleosin degradation in sunflower seedling cotyledons.
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The activity of a 65 kDa, cytosolic protease from sunflower seedling cotyledons coincides with the degradation of oleosins during seed germination. Further investigations carried out in this laboratory have demonstrated the probable association of a thiol-protease with oil bodies, leading to gradual
The acylation of sn-glycerol 3-phosphate and the metabolism of phosphatidate in microsomal preparations from the developing cotyledons of safflower (Carthamus tinctorius L.) seed.
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Microsomal preparations from the developing cotyledons of safflower (Carthamus tinctorius) catalysed the acylation of sn-glycerol 3-phosphate in the presence of acyl-CoA. The resulting phosphatidate was further utilized in the synthesis of diacyl- and tri-acylglycerol by the reactions of the
Labelling of glycerolipids in the cotyledons of developing oilseeds by [1-14C] acetate and [2-3H] glycerol.
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1. 3-sn-Phosphatidylcholine was identified as the major lipid in cotyledons from the developing seeds of soya bean, linseed and safflower when tissue was steamed before lipid extraction. The proportion of oleate in this lipid decreased markedly and that of the polyunsaturated C(18) fatty acids
Rapid temperature-induced changes in the fatty acid composition of certain lipids in developing linseed and soya-bean cotyledons.
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A change in ambient temperature caused marked alterations, over a 24h period, in the proportions of the unsaturated C18 fatty acids in 3-sn-phosphatidylcholine and 1,2-diacyglycerols during the development of soya-bean and linseed cotyledons. The molar proportion of oleate increased when the
Characterization of lipases from the lipid bodies and microsomal membranes of erucic acid-free oilseed-rape (Brassica napus) cotyledons.
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Lipase (triacylglycerol lipase, EC 3.1.1.3) activities have been reported previously in the lipid body and microsomal membranes of oilseed-rape (Brassica napus cv. Andor) seedlings, but conflicting data made it unclear whether there was one lipase in the lipid bodies, with the microsomal activity
Lipoxygenase-mediated metabolism of storage lipids in germinating sunflower cotyledons and beta-oxidation of (9Z,11E,13S)-13-hydroxy-octadeca-9,11-dienoic acid by the cotyledonary glyoxysomes.
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During the early stages of germination, a lipid-body lipoxygenase is expressed in the cotyledons of sunflowers (Helianthus annuus L.). In order to obtain evidence for the in vivo activity of this enzyme during germination, we analyzed the lipoxygenase-dependent metabolism of polyunsaturated fatty
Degradation of lipoxygenase-derived oxylipins by glyoxysomes from sunflower and cucumber cotyledons.
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BACKGROUND
Oilseed germination is characterized by the degradation of storage lipids. It may proceed either via the direct action of a triacylglycerol lipase, or in certain plant species via a specific lipid body 13-lipoxygenase. For the involvement of a lipoxygenase previous results suggested that
Isolated soya protein with standardised levels of isoflavones, cotyledon soya fibres and soya phospholipids improves plasma lipids in hypercholesterolaemia: a double-blind, placebo-controlled trial of a yoghurt formulation.
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The objective was to study whether a yoghurt containing isolated soya protein with standardised levels of isoflavones, cotyledon soya fibres and soya phospholipids is more effective in lowering total and LDL-cholesterol than a placebo. One hundred and forty-three subjects were randomised to the soya
Organization of lipid reserves in cotyledons of primed and aged sunflower seeds.
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Imbibing sunflower (Helianthus annuus L., cv. Briosol) seeds at water potentials between -2 MPa and -5 MPa leads to faster (priming) or slower (accelerated ageing) germination depending on the temperature and duration of treatment. Mobilization of food reserves may be associated with the changes in
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