Academic Writing for International Students of Science - Jane Bottomley 2015
9.8 UK versus US spelling
9 Academic and scientific conventions
There are a number of spelling differences between UK and US English.
Add the title UK or US to these lists.
colour, behaviour, labour
color, behavior, labor
offence, defence, practice (noun)/practise (verb)
offense, defense, practice (noun and verb)
Which US spelling is also now commonly used in the UK?
It is probably best to use the spelling system used in your country of study. Certain publications may require UK or US spelling. However, the most important thing is to be consistent, and not mix the two.