{
  "annotation_id": "d20dbe2c-6f93-4170-a779-0bb75f56a7b4",
  "date_created": "2026-03-02T18:00:46.722000Z",
  "date_modified": "2026-03-02T18:00:46.722000Z",
  "file_hash": "a1bfc2cda9a9611f1e55fb0cee9a32c14e924577afa7b32de10724ce9b7ebeba",
  "private": false,
  "record": {
    "abstract": "A long-term study of the elements Mg, Al, Si, P, Ca, S, Cl, Fe and Mn in\nleaves is in progress. The objective of this study is to develop a week-by-week\nprofile of these elements in leaves during several growing seasons. The profile\nincludes the following information: (1) Which elements each tree collects in\nits leaves. (2) The location in the leaf with the highest concentration, top\nside, under side or interior. (3) The week during the growing season when each\nelement first appears in the leaves of each tree. (4) The change in the\nrelative concentration from week to week. (5) The source of the element i.e.,\ndeposition from the atmosphere or the root system of the tree. This information\nis profile for each year and will be correlated with environmental conditions\nfor that year. Leaves are collected weekly from first unfolding in early spring\nuntil leaf drop in the fall. They are from the 31 trees and 26 species in\nBroome County, NY. From time to time leaves from most of the 26 species are\nbeing randomly collected from trees growing throughout the northeastern US.",
    "arxiv_id": "physics/0308093",
    "authors": [
      "James D. Brownridge"
    ],
    "categories": [
      "physics.bio-ph",
      "physics.gen-ph"
    ],
    "title": "Polar Concentration of Elements in Tree Leaves",
    "url": "https://arxiv.org/abs/physics/0308093"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "955f78fc-578f-455f-80d0-380d92002011",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}