Stem

{
  "id": "MLC-T-CHM-011354",
  "term": "Stem",
  "field": "Chemistry",
  "definition": "A relatively short, ordered portion of a polymer chain that traverses a crystalline lamella from one fold surface to the other. Multiple parallel stems, composed of adjacent chain segments, pack together to form the crystalline region of a semicrystalline polymer. The length of a stem is determined by the thickness of the lamella, which is typically on the order of 10 to 20 nanometers.",
  "subject": "Polymer",
  "references": [
    "Purple Book, 1st ed., p. 83 (http://old.iupac.org/publications/books/author/metanomski.html)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/stem/"
}