The degree of ring-opening of MDO was also investigated using C NMR spectroscopy to identify whether any ring-closed MDO units were present in the copolymers caused by the possible side-reactions as previously reported.
The degree of ring-retained species in poly(MDO- co-VBr) was investigated using H NMR spectroscopy and was estimated to be 9% based on the integration of the ring-opened species H resonances at δ = 4.0 ppm and compared with the ring-retained species resonances at δ = 3.65 ppm.
Individual isoforms (α, β, γ, and δ) of tocopherols and tocotrienols are differentiated by degree of chromane ring methylation (Figure 2).
There are 4 natural isoforms exist in each subgroup based on the degree of chromane ring methylation and are classified as α, β, γ and δ tocopherol or tocotrienol [ 21].
Reducing the degree of the rings to (5,5), respectively (4,4), by choice of a different parameterization, increases the number of G1 transition curves within the cap but does not alter the shape appreciably.
In order to utilize the aromatic components as the valued products such as BTX, instead of the hydrogenated naphthenes or heavy naphtha fraction as reforming feedstock, novel technologies that can precisely control the hydrogenation degree of multi-ring aromatics were developed to ensure the hydrogen utilization efficiency and the commercial value of petrochemical product.
For DFR, LAR and ANR, the degree of B-ring hydroxylation of the available substrate is determined by the upstream activity of flavonoid 3'-hydroxylase (F3'H) and flavonoid 3'5'-hydroxylase (F3'5'H).
As observed for PsANR activity, the substrate with a lower degree of B-ring hydroxylation (DHQ) was converted more efficiently, even though DHM is the expected native substrate in 'Courier' seed coats.
As expected, the droplet diameter increases regularly with opening time, the relation being largely linear and showing varying degrees of "coffee ring effect" with the temperature.
It is expected that variable degrees of Z ring constriction might cause the morphological diversity of chlorarachniophyte plastids.
When averaging the degree of deformation along ring segments, an almost continuous but non-linear increase of misorientation from the center toward the surface is observed, reflecting the overall strain gradient imposed by torsion.
