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Système International dâUnités. Internationally agreed coherent system of units: distance in...
aliphatic radical group attached to a main, straight chain or benzene ring structure.
lighting that comes from alongside the subject, creating contrast between lit and unlit sides of...
lighting that comes from alongside the subject, creating contrast between lit and unlit sides of...
a perforated wall or part of a wall at the end of one of the individual cells making up a sieve...
thin-walled or slightly strengthened, elongated phloem cells that conduct food substances.
the first non-zero digit in a decimal fraction. It can appear before or after the decimal comma...
a letter that is not pronounced, e.g. gnome, knowledge.