Exact(1)
Presumably you are a substance (see the entry on substance), a bearer of properties, not a substance only when it has certain properties.
Similar(59)
The tax law rules about form over substance only apply when the IRS has it in for you.
It cannot be the bread, for that would falsify the sentence, but it cannot be the body of Christ, for the change of substance only occurs when the utterance is complete.
The soul, though an immaterial substance, is the person only when united with its body.
Substances can be tasted only when they are in water solutions, and if a substance is not in solution when taken into the mouth, it must be dissolved in saliva before it can be detected by the taste buds.
Early experiments found a carcinogenic response for various chemically inert substances inserted subcutaneously, but only when they were implanted intact and not in powdered form [ 5].
CYP2D6 codes for enzymes that metabolize chemicals such as medications that target the central nervous system (including various antidepressants, stimulants, and codeine all drugs with different chemical structures), drugs of abuse, neurotoxicants, procarcinogens (substances that become carcinogenic only when metabolized into more reactive compounds), and even the body's own neurotransmitters.
Only when the substance is inhaled or swallowed does it become fatal.This is because the radioactivity emanating from polonium-210 is in the form of highly energetic alpha particles.
The system (1.1) assumed that each species produced a substance toxic to the other, only when the other is present.
Chattopadhyay [2] studied a two species competition model, each species produces a substance toxic to the other only when the other is present.
In a sense, Sanders is very good at her job, which is to stand in front of the media nearly every day and say nothing of substance and lie straight-up only when she has to.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com