Chiari surgery A posterior fossa decompression is a surgical procedure performed to remove the bone at the back of the skull and spine. The dura overlying the tonsils is opened and a patch is sewn to expand the space, similar to letting out the waistband on a pair of pants.
Undercapitalization - Undercapitalization refers to any scenario or context where companies are in a dire position of not being able to get the funding or monies they require.
As suggested above, under-fixation is more of a problem than over-fixation for most histochemical procedures. Under-fixation can be associated with artifacts secondary to alcohol exposure during tissue processing, or tissue damage during decalcification procedures.