Usually these transcripts have a fleeting existence.

Strontium is considered particularly hazardous because it can be absorbed into bone in the body, unlike tritium, which has a more fleeting existence.

From this analysis they determined that seaborgium, during its fleeting existence, probably bears some resemblance to the metals molybdenum and tungsten.

A speck whose fleeting existence is of but infinitesimal importance to the Great Scheme of Things?

This is sometimes expressed by stating that the transition state has a 'fleeting existence'.

But even if this is so, there are constant brief and very tiny fluctuations that permit the fleeting existence of virtual particles of all kinds.

Science without God offers me a fleeting, soulless existence, perhaps tolerable but unsatisfying and unfulfilling.

It may have a fleeting existence in aqueous solutions of acetic acid.

Their fleeting existence is detected with enormous detectors deep underground (to minimize "noise" from other types of particles and radiation).

It disbands and reforms each year with new personnel, and this fleeting, ephemeral existence is clearly what makes it so special.