Tylosis


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Related to Tylosis: tylosis palmaris et plantaris

Tylosis

 

a blister-like protrusion of xylem parenchymal cells that obstruct the vessels or, less commonly, the tracheids. Tyloses form when the closing membrane of a pit grows into the lumen of a vessel. The cytoplasm and, sometimes, the nucleus of the cell move into the protrusion, which is not separated by a septum from the mother cell. Tyloses may be filled with starch, calcium salts, resin, or gum. Although they are most characteristic of woody plants, they also occur in herbaceous plants, such as pumpkin, purslane, and dock. Tyloses lower the water-retaining capacity of the heartwood and increase resistance to rotting and penetration by fungi. The formation of tyloses is sometimes a response to injury.

References in periodicals archive ?
However, in tylosis patients' cells, and in cells from oesophageal cancers, the gene malfunctions.
Her oldest son Christopher,44, has tylosis,as does her daughter Janet, 33, who has passed it on to her own daughter Heather,12.
I went to a chiropodist who referred me to a skin doctor and they said it was tylosis.
They found 300 members in a single family from Liverpool, all over 20, who have tylosis and are also at risk of developing the disease.
The scientists looked at three related families affected by tylosis.
But, in common with her relatives who have suffered from the same form of cancer, she also carries the faulty gene linked to tylosis, a mild skin disorder.
Chestnut oak is used as a structural timber but because it has very limited tylosis formation in the vessels the species is prone to leakage and, like most European oak the stave must be straight grained.
More than 340 members of a Liverpool family - spanning seven generations - have been affected by a genetic disorder called tylosis.
By contrast, 161-49 C is notoriously difficult to establish due to tylosis problems with young vines.
Tylosis Palmaris et Plantaris (Howel Evans syndrome) describes a familial association of punctuate keratosis of the palms and soles with esophageal carcinoma.
The condition is linked to tylosis, a mild skin disorder which causes hard, yellow skin on the feet and hands.