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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"). It refers to the fact that starch gives a similar reaction, also called an amyloid reaction. The test can be on microscopic features, such as spore walls or hyphal walls, or the apical apparatus or entire ascus wall of an ascus, or be a macroscopic reaction on tissue where a drop of the reagent is applied. Negative reactions, called inamyloid or nonamyloid, are for structures that remain pale yellow-brown or clear. A reaction producing a deep reddish to reddish-brown stai

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  • Amyloidität (de)
  • Amyloid (mycology) (en)
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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"). It refers to the fact that starch gives a similar reaction, also called an amyloid reaction. The test can be on microscopic features, such as spore walls or hyphal walls, or the apical apparatus or entire ascus wall of an ascus, or be a macroscopic reaction on tissue where a drop of the reagent is applied. Negative reactions, called inamyloid or nonamyloid, are for structures that remain pale yellow-brown or clear. A reaction producing a deep reddish to reddish-brown stai (en)
  • Die Amyloidität bezeichnet die Färbbarkeit von Gewebestrukturen mit Hilfe von Iodreagenzien. Das zugehörige Eigenschaftswort heißt amyloid. Ist eine Struktur nicht anfärbbar, bezeichnet man sie als inamyloid. Färbbare Strukturen sind bei Pilzen: Sporen, Sporenornamente, Ascuswände (besonders Apikalringe), Hyphen, die Trama der Fruchtkörper etc. (de)
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  • Die Amyloidität bezeichnet die Färbbarkeit von Gewebestrukturen mit Hilfe von Iodreagenzien. Das zugehörige Eigenschaftswort heißt amyloid. Ist eine Struktur nicht anfärbbar, bezeichnet man sie als inamyloid. Die Farbreaktion amyloider Strukturen ist insbesondere in der Mykologie ein wichtiges taxonomisches Unterscheidungskriterium. Verwendet werden als Reagenzien: Lugolsche Lösung (eine Iod-Kaliumiodid-Lösung) und Melzers Reagenz (= Lugolsche Lösung mit Chloralhydrat). Die Farbreaktionen gehen ins Blaue bis Violette. Im Fall der Hemiamyloidität wird die Blaureaktion nur nach KOH-Behandlung erhalten; ohne KOH ruft Lugolsche Lösung hier eine rote bis rotbraune Reaktion hervor, während die hohe Chloralhydrat-Konzentration in Melzers Reagenz diese Rotreaktion unterdrückt, folglich Inamyloidität suggeriert. Färbbare Strukturen sind bei Pilzen: Sporen, Sporenornamente, Ascuswände (besonders Apikalringe), Hyphen, die Trama der Fruchtkörper etc. (de)
  • 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"). It refers to the fact that starch gives a similar reaction, also called an amyloid reaction. The test can be on microscopic features, such as spore walls or hyphal walls, or the apical apparatus or entire ascus wall of an ascus, or be a macroscopic reaction on tissue where a drop of the reagent is applied. Negative reactions, called inamyloid or nonamyloid, are for structures that remain pale yellow-brown or clear. A reaction producing a deep reddish to reddish-brown staining is either termed a dextrinoid reaction (pseudoamyloid is a synonym) or a hemiamyloid reaction. (en)
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