Problem: Add spaces: Idroppeditallthetime,sothescreenwascracked.

Spaces added: I dropped it all the time, so the screen was cracked.

Problem: Add spaces: Thismaynotbeaverylight-heartedtime,butitshouldbequiteproductive.

Spaces added: This may not be a very light-hearted time, but it should be quite productive.

Problem: Add spaces: Theantibodiesusedinawesternblotcanbespecifictoatotalproteinortouniquepost-translationalmodificationsofaprotein,suchassitesofphosphorylation,acetylation,methylation,orubiquitination.

Spaces added: The antibodies used in a western blot can be specific to a total protein or to unique post-translational modifications of a protein, such as sites of phosphorylation, acetylation, methylation, or ubiquitination.

Problem: Add spaces: LukeMueller,RichardSchmidtandAndreasKuffner(all24)Sittinginthetruestsenseofthewordinaboat.

Spaces added:
Luke Mueller, Richard Schmidt and Andreas Kuffner (all 24) Sitting in the truest sense of the word in a boat.