XB-ART-7937
J Exp Zool
2001 Nov 01;2906:652-61. doi: 10.1002/jez.1116.
Show Gene links
Show Anatomy links
Covariance of ion flux measurements allows new interpretation of Xenopus laevis oocyte physiology.
???displayArticle.abstract???
An animal-vegetal net ionic current identified previously using voltage probe techniques in maturing Xenopus laevis oocytes has now been investigated using noninvasive ion-selective microelectrodes. Three-dimensional fluxes of hydrogen (H(+)), potassium (K(+)), and bicarbonate (HCO(3)(-)) were characterized with respect to the developmental stage and hemisphere of the oocyte and presence of surrounding follicular tissue. Variable effluxes of H(+) and HCO(3)(-) were recorded from both the animal and vegetal hemispheres. Variable influxes and effluxes of K(+) were also observed. The equatorial region, silent by voltage probe, exhibited fluxes of H(+) and K(+). Simultaneous measurement of pairs of ions allowed correlation analysis of two ion types. Notably for H(+) and K(+) data, positive and negative correlation at animal and vegetal poles respectively offer an explanation of the unpredictable results obtained when individual ions were observed independently.
???displayArticle.pubmedLink??? 11748614
???displayArticle.link??? J Exp Zool