Examples of index fossils. Index fossils (also known as guide fossils, indicator fossils or zone fossils) are fossils used to define and identify geologic periods (or faunal stages).
Methyl cellulose. Methyl cellulose (or methylcellulose) is a chemical compound derived from cellulose. It is a hydrophilic white powder in pure form and dissolves in cold (but not in hot) water, forming a clear viscous solution or gel.
With the same addition amount, the water-retention rate of HPMC is higher than that of Methyl Cellulose. 5. Hydroxypropyl Methyl Cellulose has better enzyme resistance than Methyl Cellulose, and the possibility of enzymatic degradation of Hydroxypropyl Methyl Cellulose is less than that of MC. 6.