Respuesta :
Multiple analytical techniques were used to examine the structure of the lignin in the cortex and pith of elephant grass (Pennisetum purpureum) stems both in situ and in isolated milled "wood" lignins. Pyrolysis in the presence of tetramethylammonium hydroxide and 2D NMR revealed the presence of p-coumarate and ferulate in the cortex and pith as well as in their isolated lignins. This suggested that ferulate acylates the carbohydrates while p-coumarate acylates the lignin polymer.
Describe the cortex.
- The Latin word cortex, which means "bark," often refers to a structure's topmost layer.
- Although the cerebellum also has an outer layer known as the cerebellar cortex, when referring to the brain, the cortex most frequently refers to the cerebral cortex.
- Return to the Glossary.
What is a pith?
- Vascular plants have a tissue in their stems known as the pith or medulla.
- Soft, spongy parenchyma cells, which make up pith, can occasionally store starch.
- The pith is found in the middle of the stem in eudicotyledons.
- It also spreads into the flowering stems and roots of monocotyledons.
- A ring of xylem surrounds the pith, and a ring of phloem surrounds the xylem.
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