This theory does not explain the observed instability of colloidal dispersions against irreversible aggregation in solutions of high ionic strength .
This theory did not explain the observed instability of colloidal dispersions against irreversible aggregation in solutions of high ionic strength .

Are these two sentences paraphrases of each other?
yes

He listed South Africa against the British Isles in Kimberley on 29 August 1891 .
He captained Kimberley on 29 August , 1891 , against the British Isles in South Africa .

Are these two sentences paraphrases of each other?
no

The entire side-effect profile of artificial tears is , however , very low .
However , the overall side-effect profile of artificial tears is very low .

Are these two sentences paraphrases of each other?
yes

Celestia implores Twilight and her friends to stop the Elements of Harmony to recover Chrysalis .
Celestia invites Twilight and her friends to stop the elements of harmony to recover Chrysalis .

Are these two sentences paraphrases of each other?
yes