Sentence examples for been observed before although from inspiring English sources

The fact that in the absence of tryptophan TRAPste retains its ability to bind tightly to RNA has been observed before (although the temperature-dependence was not studied), but it was attributed to incomplete removal of tryptophan [ 41].

Why have they never been observed before?

For the Hox gene clusters of teleosts, it has been observed before [[ 39] and references therein] that, although all fish genomes studied so far vary in the gene content and even number of Hox gene clusters, the total number of Hox genes contained in their genomes is about the same as in the genomes of tetrapods, which did not experience this WGD.

Although the general structure type represented by 1 has been observed before (see above), the formation of 1 is remarkable.

Although more research is needed to explain this discrepancy, this phenomenon has been observed before.

This phenomenon has been observed before.

Second, because nitrogenase may be used by the bacterium to evolve hydrogen out of the cell and not for the N2 fixation, although this phenomenon was observed before only in mutant strains of the bacterium [22], [40].

A moment of silence was observed before the game.

A moment of silence was observed before the race.

Although the pattern transformation with alternating elliptic voids has been observed under uniaxial compression before, our results show that the pattern transformation can be promoted by biaxial compression, while biaxial compression/tension can delay it.

Catalyst characterization results suggest the presence mainly of the orthorhombic Te2M20O57 (M = Mo, V and Nb) bronze in samples before and after use in oxidation and ammoxidation, although some little modifications have been observed after its use in ammoxidation reaction.