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In mycology a tissue or feature is said to be amyloid if it has a positive amyloid reaction when subjected to a crude chemical test using iodine as an ingredient of either Melzer's reagent or Lugol's solution, producing a blue to blue-black staining. The term "amyloid" is derived from the Latin amyloideus ("starch-like"). [1]
Melzer's reagent can be used to test whether spores are amyloid, nonamyloid, or dextrinoid. Spores that stain bluish-gray to bluish-black are amyloid; Spores that stain brown to reddish-brown are dextrinoid; This test is normally performed on white spored mushrooms. If the spores are not light colored, a change will not be readily apparent.
To date, 37 human proteins have been found to form amyloid in pathology and be associated with well-defined diseases. [2] The International Society of Amyloidosis classifies amyloid fibrils and their associated diseases based upon associated proteins (for example ATTR is the group of diseases and associated fibrils formed by TTR). [3]
Amyloid purpura is a condition marked by bleeding under the skin in some individuals with amyloidosis. [1] Its cause is unknown, but coagulation defects caused by amyloid are thought to contribute. Presentation
People with amyloidosis may experience dysfunction in various organ systems depending on the location and extent of nervous system involvement. [8] For example, peripheral neuropathy can cause erectile dysfunction, incontinence and constipation, pupillary dysfunction, and sensory loss depending on the distribution of amyloidosis along different ...
The use of microscopic features is necessary to distinguish clearly among the species: A. flavoconia has elliptic, amyloid spores, while A. frostiana has round, non-amyloid spores; A. muscaria has nonamyloid, elliptic spores. In the field, A. flavorubescens can usually be distinguished by its yellow cap color. [11]
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