In the industrial manufacturing process of polyvinyl alcohol, there is inevitably a small amount of acetaldehyde in the alcoholysis solution (methyl acetate/methanol mixture), the accumulation of which may decrease the purity of product.
Estimates of islet purity pre- and post-cryopreservation were positively correlated (slope = 0.84, r = 0.73, p < 0.001; Fig. 1b), and cryopreservation did not significantly decrease the purity (51.2 ± 4.4 vs 47.2 ± 4.1%, n = 41).
Isonicotinamide formed in the reaction catalyzed by the fungal nitrilase decreased the purity INA in the end, which was further hydrolysed to INA utilizing amidase from Rhodococcus erythropolis A4.
Although downstream operations are designed to remove and recover magnetite, the unavoidable presence of residual magnetite in the final coal product dramatically decreases the purity and suitability of the coal for the silicon market.
Unfortunately, because l-arabinose is the second most abundant sugar in hydrolysate and can be reduced by xylose reductase (XR), the by-product l-arabinitol can also be produced, thus decreasing the purity of xylitol and the efficiency of the bioconversion process.
In this case, the enzyme would catalyze the hydrolysis of the slower-reacting d-menthyl acetate, thus decreasing the optical purity of the product (l-menthol).
Because optically pure lactates are synthesized from pyruvate by the catalysis of chiral-specific d- or l-lactate dehydrogenase, the higher thermostability of l-LDHs is assumed to be one of the key factors decreasing the optical purity of d-lactic acid produced from L. coryniformis at high temperature.
The majority of α-acetolactate was subsequently transformed into (3R -AC catalyzed by α-acetolactate decarboxylase (α-ALDC), while a small amount of α-acetolactate was transformed into diacetyl (DA), by the non-enzymatic oxidation decarboxylation (Liu et al. 2011b; Yang et al. 2014), and DA could be further converted into (3R -AC whicatalyzedsed the stereoisomeric purity of (3R)-AC.
He decreased the silver purity of the denarius from 58% to 46.5% — the actual silver weight dropping from 1.82 grams to 1.41 grams.
The overall balance between the mutational mechanisms that promote repeat expansions and the accumulation of point mutations that decrease repeat purity and therefore decrease the probability of repeat expansion is likely to dictate the nature of the poly-Q tract within a gene and its propensity for allelic variation.
Thus, even though selection should favor point mutations modifying the repeat sequence purity, which would decrease the propensity toward further disease-causing repeat accumulation, repeat sequence in disease-associated coding regions is more highly conserved than in nearby non-coding regions.
