The reason for his death is at present unknown".
Without a solid subscription base, companies might feel loath to present unknown or experimental work.
The situation with Kermit programs not listed here is at present unknown.
She saw herself the object of attention, to tens and to scores of them at present unknown.
The exact cause of the disaster is at present unknown, but it was preceded by an outbreak of fire.
How their size is determined and whether it has a functional relevance are at present unknown.
According to Ives we must first develop apparatus "involving excessive speeds of operation, microscopic accuracy of film positioning, and photographic emulsions of speeds at present unknown".
The unique feature of H. pylori catalase is a four lysine-motif at the C-terminus (aa 501 505), the function of which is at present unknown.
Penetratin crosses the plasma membrane by a receptor and metabolic energy-independent mechanism which is at present unknown.
The long-term (five-year) comparative results of treatment of multivessel coronary artery disease with stenting or coronary artery bypass grafting (CABG) is at present unknown.
While the fact that the symmetry is broken is universally accepted as one of the cornerstones of the standard model of particle physics, the mechanism responsible for this breaking is at present unknown.
