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Caratterizzazione morfofunzionale delle branchie di Arapaima gigas

Caratterizzazione morfofunzionale delle branchie di Arapaima gigas

Cleverson Agner Ramos / Marisa Narciso Fernandes

90,88 €
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Editorial:
KS OmniScriptum Publishing
Año de edición:
2025
Materia
Biologia, ciencias de la vida
ISBN:
9786208945169
90,88 €
IVA incluido
Disponible

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La struttura delle branchie del pesce amazzonico Arapaima gigas, che respira aria obbligata, è stata analizzata durante il passaggio alla respirazione aerea obbligatoria e i dati ottenuti sono stati correlati alla sua modalità di respirazione. Le branchie di campioni con massa corporea compresa tra 2 ge 5000 g sono state raccolte, fissate ed elaborate per analisi morfometriche, istochimiche, immunoistochimiche, al microscopio elettronico a trasmissione e a scansione (area frazionaria delle cellule di cloruro - AFCC e densità). Nelle fasi iniziali di sviluppo della specie, la struttura delle branchie è simile a quella dei respiratori acquatici obbligati, ma man mano che l’animale cresce, si verificano profondi cambiamenti, influenzando la respirazione e lo scambio ionico. Le lamelle mantengono la loro struttura organizzativa, compresa la circolazione degli eritrociti, ma diventano vestigiali negli animali dai 1000 g in poi, rimanendo parzialmente immerse nell’epitelio filamentoso. I principali tipi di cellule che compongono l’epitelio branchiale sono le cellule del cloro (CC), le cellule mucose (MC) e le cellule squamose (PC). I CP hanno una forma irregolare e micropieghe disposte in modo casuale sulla superficie cellulare.

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