I think "pe" is the same as "pe de cuba", which you found online. I'm giving this a 3, as my first reference is someone else's translation and may not be totally reliable.

I've never seen "inoculum" before, but that could just be my ignorance. Inoculant is a synonym.


Mass of H2SO4 required per l of inoculum (“pé-de-cuba”) during the acid treatment process, in the fifth cycle for the four yeast strains studied. The value was calculated based on the volume of ‘pé-de-cuba’ (volume of yeast biomass + the volume of fermented medium from the previous cycle + the volume of water used to dilute the yeast cream) and using a specific volume for yeasts as 1.1 g ml⁻¹.
http://www.researchgate.net/figure/Mass-of-H2SO4-required-pe...

inoculum
material used in an inoculation, as bacteria; inoculant
http://www.collinsdictionary.com/us/dictionary/english/inocu...

--------------------------------------------------
Note added at 1 hr (2023-05-23 18:13:34 GMT)
--------------------------------------------------

I'm guessing the idea of "pe" is "base". You add it to the grape juice, and get wine.

Sediment is the 'pé' that settles out of wine

:)