Wounding tissue

Cross-linking agents have been proposed for the improvement of chitin fibres in the wet state. Epichlorohydrin is a convenient base-catalysed crosslinker to be used in 0.067 M NaOH (pH 10) at 40 °C. The wet strength of the fibres was considerably improved, whereas cross-hnking had neghgible effect on the dry fibre properties. Of course, the more extended the chemical modification, the more unpredictable the biochemical characteristics and effects in vivo. Every modified chitin or modified chitosan fibre should be studied in terms of biocompatibiUty, biodegradabiUty and overall effects on the wounded tissues. 

Figure 10. Transverse section of coalified Cyrilla wood through wound tissue. Note differential response of the thick fiber wall layers to coalification. The outermost wall layers have produced an isotropic, orange-brown material whereas the bulk of the secondary wall has yielded a pale yellowy strongly anisotropic coal substance. A ring of dark red material has been produced from the inner secondary wall in the fiber-tracheid shown in the left center of the photograph and a semiopaque, granular product is seen in an adjacent iracheary element. 323X...

Tannins arc found in various parts of the plant, appearing frequently in leaves, and in llie cortical lissues of stems. Tannins may be found in the walls of cells or in the vacuoles often their presence causes the cell to appear dark-colored. Many fruits, such as the persimmon, contain large amounts of tannin, especially before they are ripe. Wound tissues, and especially the hypertrophied tissues known as galls, which result from the... 

This study consisted of applying coating or films of dressing material on agar plates to determine the applicability of wounded tissue which is moist and very hydrophilic, conditions that usually do not provide good properties for adhesive substrates (i.e., adherent). 

Lesot, A., Benveniste, I., Hasenfratz, M.R, and Durst, F., Induction of NADPH-cytochrome P-450 (c) reductase in wounded tissues from Helianthus tuberosus tubers, Plant Cell Physiol., 31, 1177-1182, 1990. 

The most important reaction requiring ascorbate as a cofactor is the hydroxylation of proline residues in collagen. Vitamin C is, therefore, required for the maintenance of normal connective tissue as well as for wound healing since synthesis of connective tissue is the first event in wound tissue remodeling. 

Immunochemical and fluorographic analysis of in vitro translation products of mRNAs from fresh and wounded tissues of winter squash mesocarp [59] and tomato pericarp [60,164] clearly provide evidence for the transcriptional control of ACC synthase. Translatable mRNA for ACC s3mthase is not detectable in fresh tissue, but increases dramatically after wounding with a lag period of a few hours. Time course profiles of ethylene production after wounding, ACC synthase activity and the relative abundance of the mRNA after wounding are well correlated with each other. 

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