Results: 3

1.
Figure 2

Figure 2. From: Hamster oocyte membrane potential and ion permeability vary with preantral cumulus cell attachment and developmental stage.

Impalement of cumulus enclosed oocytes. Photomicrograph depicting the method of impalement required for electrical potential measurements in cumulus-enclosed oocytes, preantral (A) and metaphase II (B).

Benjamin R Emery, et al. BMC Dev Biol. 2001;1:14-14.
2.
Figure 1

Figure 1. From: Hamster oocyte membrane potential and ion permeability vary with preantral cumulus cell attachment and developmental stage.

Representation of isolated cells. (A) Cumulus enclosed oocyte at the preantral stage. (B) Cumulus free oocyte at the preantral stage. (C) Metaphase II cumulus enclosed oocyte. (D) Metaphase II cumulus free oocyte.

Benjamin R Emery, et al. BMC Dev Biol. 2001;1:14-14.
3.
Figure 3

Figure 3. From: Hamster oocyte membrane potential and ion permeability vary with preantral cumulus cell attachment and developmental stage.

Equation for calculation of PNa/PK. The GHK can rearranged to give the above linear form, with the assumptions given in the text (A). Where P = PNa/PK, M is the total cation concentration outside the membrane (Na+ and K+). When the left term from equation A is plotted against the test (K+) cation concentration, equation A is simplified to equation B. Where b is the slope. B can then be rewritten as C where a is the intercept.

Benjamin R Emery, et al. BMC Dev Biol. 2001;1:14-14.

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