The mass loss of wood used as a criterion in the standarised agar-block method of evaluation of toxic value of preservatives depends upon the relationship between volume of specimens, their outspread planes and ratio of areas of particular anatomic sections. Upon the computer-assisted mathematical basis the dimensions of miniaturized specimens which make 1/2, 1/4, and 1/8 part of standarized ones were calculated. With correspondingly shortened times of exposition on the activity of Coniophora puteana the determination of the fungitoxic values of the CCB type preservative was performed.

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