Sentence examples for cannot have been caused from inspiring English sources

The Lu3+ ion has no excited 4f levels, and therefore, thermal quenching of Lu3+ 5d-4f luminescence cannot have been caused by nonradiative transitions to 4f levels and should be attributed to the thermally activated ionization of 5d electrons to the conduction band [21, 22].

The large sample size secures that the conclusions drawn from the statistical analyses are reliable and cannot have been caused by random effects.

This effect cannot have been caused by sugars or other soluble compounds that would inhibit cellulases, since the pretreatment liquid, which contained the soluble compounds, was removed from the solid residue before the enzymatic hydrolysis.

"I cannot overstate the feelings of anguish that have been caused by the government's conduct in recent days," Johnson said.

It cannot be excluded that polar effects might have been caused by the disruption of the pgi gene and might have contributed to the observed metabolic phenotype of C. glutamicum Pgi mutants.

We cannot explain this result, although it might have been caused by the characteristics of TE-15.

"You cannot call it pilot error because it may have been caused by reactions to data that was wrong," said Chris Yates, an aviation industry consultant.

We cannot forget that the majority of the deficit has been caused by the Republican zeal for tax cutting.

Climate change has been caused by ignorance and stupidity and cannot be solved by endorsing more of the same with geo-engineering.

"I cannot apologise for something that I have not done, but I do recognise the disproportionate stress that has been caused".

Separation of the tubulin isoforms may have facilitated novel β-tubulin loci but it cannot have been derived from the same fundamental causes.