The metric system is adopted as standard. The system of units known as 'SI' should be used. If non-standard abbreviations must be used they should be defined in the text. Abbreviations for the names of less common compounds should also be used, but then the full term should be given on first mention. Numbers up to ten should be spelled out in the text except when referring to measurements.
Fractions are to be expressed as decimals.
Numbers higher than ten are to be represented as numerals except at the beginning of a sentence. The preferred position in the text should be indicated. Smith et al . Hexose accumulation and turgor-sensitive starch synthesis in discs derived from source versus sink potato tubers. Ullrich CI, Guern J . 1989.