Such nanopublications use the concept of an AIDA sentence to express a (scientific) statement in an informal or semi-formal manner, which can be formally linked.

AIDA sentences are:

• Atomic: a sentence describing one thought that cannot be further broken down in a practical way
• Independent: a sentence that can stand on its own, without external references like "this effect" or "we"
• Declarative: a complete sentence ending with a full stop that could in theory be either true or false
• Absolute: a sentence describing the core of a claim ignoring the (un)certainty about its truth and ignoring how it was discovered (no "probably" or "evaluation showed that"); typically in present tense

You can find more information about AIDA sentences here