Our results show that all of the brown rot fungi tested produce oxalic acid in liquid as well as in semisolid cultures. Gloeophyllum trabeum, which accumulates the lowest amount of oxalic acid during decay of pine holocellulose, showed the highest polysaccharide-depolymerizing activity. Semisolid cultures inoculated with this fungus rapidly converted C-labeled oxalic acid to CO(2) during cellul...

Vegetables generally contain more or less oxalic acid, which is produced by metabolism in cytoplasm.12 Most of the oxalic acid is fixed as calcium oxalate to protect protoplasm from its toxic action.3 Vegetables containing a considerable quantity of oxalic acid are usually boiled before being cooked to remove any harshness.4 The oxalic acid contained in food is determined by the KMnO4 titration...

Chborhexidine, a potent antiseptic (1), has been used as a preservative for urine (2, 3) in which oxabic acid and calcium were to be measured. We recently described a biquid-chromatographic method for determining oxalic acid in urine (4) and wish to describe our results when using chlorhexidine gluconate (CG) to replace HCI in the preservation of urine in which oxalic acid was measured. Our met...

oilseed rape is economically affected by stem rot caused by sclerotinia sclerotiorum worldwide. glucosinolates arethe specific secondary metabolites of brassica plants that appear in different profiles of each species. their hydrolysisproducts have biocidal activity and may play a role in resistance against plant pathogenic fungi. the resistance ofoilseed rape (brassica napus) cultivars and two...

The objective of this work is to examine the influence of oxalic acid formed on the degradation of phenol by Fenton reagent. Oxalic acid formed at initial stage within 30 min significantly suppresses the reduction of ferric ion, thus terminating degradation reaction. The yield of oxalic acid is dependent on the amount of ferrous ion dosed since the minimal amount of oxalic acid is formed after ...

High Al resistance in buckwheat (Fagopyrum esculentum Moench. cv Jianxi) has been suggested to be associated with both internal and external detoxification mechanisms. In this study the characteristics of the external detoxification mechanism, Al-induced secretion of oxalic acid, were investigated. Eleven days of P depletion failed to induce secretion of oxalic acid. Exposure to 50 &mgr;M LaCl3...

Dicarboxylic organic acids have properties that differ from those of sulfuric acid during hydrolysis of lignocellulose. To investigate the effects of different acid catalysts on the hydrolysis and degradation of biomass compounds over a range of thermochemical pretreatments, maleic, oxalic and sulfuric acids were each used at the same combined severity factor (CSF) values during hydrolysis. Xyl...

l-[1-(14)C]Ascorbic acid was supplied to detached barley seedlings to determine the subcellular location of oxalic acid, one of its metabolic products. Intact vacuoles isolated from protoplasts of labeled leaves contained [(14)C]oxalic acid which accounted for about 70% of the intraprotoplast soluble oxalic acid. Tracer-labeled oxalate accounted for 36 and 72% of the (14)C associated with leaf ...

Formic acid and oxalic acid field trials for control of Varroa destructor were carried out in autumn according to the Swiss prescriptions during three successive years in different apiaries in Switzerland. The following parameters were determined in honey that was harvested the year after treatment: formic acid, oxalic acid and free acidity. The following range of values were found in honeys of...