A significant amount of work has been done in the field of the transition metal (TM) macrocyclic-catalyzed oxygen reduction reaction (ORR), but not as a function of temperature and substitution in an acidic electrolyte to simulate the environment of an operating PEM fuel cell.
He explained the offer "to plead guilty by exceptions and substitutions" in a statement posted on his Web site late Wednesday.
Coumestans 2a i, bearing different patterns of substitution in A- and D-rings, were synthesized and evaluated as inhibitors of kidney Na+,K+-ATPase and ligands for the central benzodiazepine (BZP) receptor.
In this paper the effects of various vacancy and substitution defects in a coronene parent molecule have been systematically analyzed using density functional theory (DFT).
The fluorination in the D unit and the alkoxy substitution in the A unit induced WD and WA properties, respectively.
By the time the supply was exhausted, the company was no longer in business and substitution with a domestic peptone resulted in a marked, abrupt, but variable, loss of virulence in the strain.
Recommendations In economic terms, it is possible to implement a programme of this kind, under our conditions, without increasing the number of staff and without milk substitution, in a city such as Chimoio.
The 1H NMR spectrum exhibited meta coupled doublets (J = 3.0 Hz) at δ 6.58 and 6.44 showing matching substitution in A ring as in case of compound 1.
However, in the mouse rat comparison, we observed difference between the two and found only one substitution in a window (≥99% identities, P < 1.2 × 10−5, the binomial model).
Many important trends in forest development across landscapes and centuries are difficult to measure directly, and a space-for-time substitution in a chronosequence may provide useful insight at these scales.
For example, assume that we have two species with the same number of synonymous polymorphisms (20) and substitutions (100) in a sample of genes.
