Transfer to 10 degrees C increased the ascorbic but not the oxali

Transfer to 10 degrees C increased the ascorbic but not the oxalic acid content of the leaf intercellular washing fluid (IWF). Oxalate oxidase (OXO EC 1.2.3.4) activity was not detected in extracts of leaf blades. Therefore, oxalic acid degradation via OXO was not involved in the control of its content. Our results show that low temperature acclimation increases nutritional quality of spinach leaves via a physiological rise of ascorbic acid that does not feed-forward on the content of oxalic acid. (C) 2009 Elsevier Masson SAS. All rights reserved.”
“The porous silicon tube structures,

with a diameter of 20 mu m, were formed by pulsed anodization process. A phenomenological mechanical model was used to explain the formation mechanism. The agreement between the NU7441 inhibitor experimental data and theoretical results indicated that the stresses in parallel and perpendicular directions of the nanocolumnar structure may cause the crack and curve of the porous silicon layer to form the tube structures. (C) 2009 American Institute

of Physics. [doi:10.1063/1.3243231]“
“The ethyl acetate (EtOAc) layer of ripened fruits of black raspberry (Rubus coreanum) had higher DPPH radical scavenging activity than was detected in other layers. Six phenolic compounds were purified and isolated from the EtOAc layer of ripened black raspberry fruits via octadecyl silane (ODS)-column chromatography and amide column-HPLC using a guided DPPH radical scavenging assay. These compounds were identified as 4-hydroxybenzoic acid (1), 2-O-(3′,4′-dihydroxybenzoyl)-4,6-dihydroxyphenylmethylacetate (2, jaboticabin), Salubrinal mw phloridzin (3), kaempferol 3-O-beta-d-glucopyranoside (4), quercetin 3-O-beta-d-glucuronic acid methyl ester (5), and quercetin (6), based on MS and NMR analysis. Three compounds (1, 5, and 6) had been identified previously in this plant, but other compounds (2-4) were newly isolated from this plant. Compound 2, 5, and 6 evidenced higher DPPH radical scavenging activity than alpha-tocopherol at the same concentration.”
“Oligochitosan (OC) can regulate plant defense responses in many aspects, LEE011 datasheet but

the basic signal transduction pathway is still unclear. In this study, we used transgenic (TG) tobacco (Nicotiana Tabacum var. Samsun NN) as plant material whose oligochitosan induced protein kinase (OIPK) gene was inhibited by antisense transformation, to study the role of OIPK in tobacco defense reactions. The results showed that OIPK could increase tobacco resistance against tobacco mosaic virus (TMV), in that wild-type (WT) tobacco showed longer lesion appearance time, higher lesion inhibition ratio, smaller average final lesion diameter and lower average final lesion area percent to whole leaf area. It led us to analyze some pathogenesis related (PR) enzymes’ activities and mrRNA level, which played roles in tobacco resistance against TMV.

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