High resolution image of one of several contractile vacuole pores of the proter of a dividing cell. This is presumably at an early stage of development as division is not yet complete. This section shows the pore to be encased in microtubules. The micrograph shows the microtubules cut transversely on one side so one can count them and obliquely on the other side of the pore. Whether the CV is yet functional at this stage is not known although the pore septum appears as two flaps of membrane. The pore lies close to the division furrow in the proter. TEM taken on 5/21/69 by M. Sage with Philips 300 operating at 60kV. Neg. 14,800X. The raw film was scanned with a Nikon Coolscan 9000ED. This image is suitable for quantitative analysis. Standard glutaraldehyde fixation followed by osmium tetroxide, dehydrated in alcohol and embedded in an epoxy resin. Microtome sections prepared at approximately 75nm thickness. Additional information available at (http://www5.pbrc.hawaii.edu/allen/).
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