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The last equation shows that the maximum value of the Đ is 2, which occurs at a monomer conversion of 100% (or p = 1). This is true for step-growth polymerization of linear polymers. For chain-growth polymerization or for branched polymers, the Đ can be much higher.
A generic representation of a step-growth polymerization. (Single white dots represent monomers and black chains represent oligomers and polymers) [1] Comparison of molecular weight vs conversion plot between step-growth and living chain-growth polymerization
Previously, a 2 digit score was also provided, but has since been eliminated. The two-digit score was normalized to the three-digit score such that a 75 was equal to the minimum passing score (currently 194) for the USMLE Step 1. [1] Contrary to popular opinion, the two-digit score does not represent a percentile. [2]
Permanent employees below step 10 in their grade normally earn step increases after serving a prescribed period of service in at least a satisfactory manner. The normal progression is 52 weeks (one year) between steps 1–2, 2–3, and 3–4, then 104 weeks (two years) between steps 4–5, 5–6, and 6–7, and finally 156 weeks (three years ...
The degree of polymerization, or DP, is the number of monomeric units in a macromolecule or polymer or oligomer molecule. [1] [2] [3]For a homopolymer, there is only one type of monomeric unit and the number-average degree of polymerization is given by ¯ ¯ = ¯, where ¯ is the number-average molecular weight and is the molecular weight of the monomer unit.
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Step 2 CK is a three-digit-scored exam typically taken after the third year of medical school, which consists of clinical rotations in primary care fields. In February 2020, the Harvard Crimson wrote, "the fact that Step 2 is a more clinically relevant exam than Step 1, makes it a better proxy for clinical acumen."