English translation: blank sample (or just "blank")
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REGULACIÓN ENZIMÁTICA DE LA ACUMULACIÓN DE SACAROSA EN PLANTAS ...
... Activity of control sample was compared with that of a blank sample without enzyme. ... La
actividad de la muestra testigo se comparó con la preparada en paralelo ... www.colpos.mx/agrocien/Bimestral/ 2002/jul-ago/art-2.pdf
The Modern Control Sample
The Modern Control Sample: The modern control sample is used to establish
the pattern of formation of growth marks for the target species. ... www.umanitoba.ca/faculties/arts/anthropology/ thin_section/control.html
P Forgas Brazil Local time: 11:45 Native speaker of: Spanish PRO pts in pair: 1241