Browsing by Subject "X-ray"

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    Quantitative histochemistry of phosphorus in the vestibular gelatinous membrane, an electron probe X-ray microanalytical study
    (Murcia : F. Hernández, 1993) López-Escámez, J. A.; Crespo, P. V.; Cañizares, F. J.; Campos, Antonio
    Electron probe X-ray microanalysis was used to study the phosphorus concentration in the otolithic gelatinous membrane of the saccule and the utricle with scanning electron microscopy. The otolithic membranes were plunge-frozen in liquid N2 and freeze-dried. Quantitative analysis was carried out with an energy dispersive detector using the peak-to-background ratio method and different concentrations of KH2P04 salts dissolved in dextran solutions. The otolithic gelatinous membrane consists of a 25- 30 pm-thick layer overlying the cilia of the hair cells. Elements detected in the gelatinous membrane are : Na, P, S, CI, K and Ca. Although Student's t-test did not show significant differences between saccular and utricular concentrations of phosphorus, the distribution of this element in the two organs was different. Regresssion analysis established that the concentrations of phosphorus in the saccular and utricular gelatinous membrane were dependent. The regression equation was: y = 18.02x2 + 133.9 (r = 0.83, P < 0.05) where y is the concentration of phosphorus in the utricle, and x2 the concentration of phosphorus in the saccule. The findings obtained in the present study could be related to structural differences in organic phosphate residues of the phosphoproteins associated to collagen, or to different polyphosphoinositide turnover rates in the cell membrane.
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    Record of a wild specimen of Redline torpedo fish, Puntius denisonii (Actinopterygii: Cyprinidae) with vertebral deformity
    (Murcia: Servicio de Publicaciones de la Universidad de Murcia, 2014) Sajeevan, Sajan; Varkey Anna-Mercy, Thoranam; Vadakkedath, Malika
    Se registró una deformidad vertebral en un ejemplar silvestre de Puntius denisonii de los Ghats occidentales, India. El estudio radiológico y morfológico comparativo de un pez normal y el deforme revelaron una malformación vertebral en la zona caudal de la aleta dorsal. Se discuten las posibles causas de la deformidad vertebral