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• Supernovas may have much to do with the triggering of star birth.

• Closely allied (or related, or connected) to noise control is vibration control.

• The problem is closely allied to [or connected (or associated) with] seepage control.

• Flow rate and pressure are closely (inter) linked [or (inter)related].

• The response to most compounds is closely related to the mass of ...

• Other auxiliary systems are intimately connected.

• Intimately related to the economics of the accelerators are the technological factors that ...

• Hemophilia is closely linked to colour blindness in some families.

• The electron is tightly bound to the atom.