rdf-syntax-grammar
mods:
  schema location: http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
  title info:
    title: Ultrastructural investigations of three stages of the sexual life history of Peridinium balticum (Pyrrhophyta)
  name:
    name part: Chesnick, Joby Marie
    name part: 1956-
    role:
      role term: creator
  name:
    name part: Cox, Elenor R.
    role:
      role term: degree supervisor.
  name:
    name part: Fryxell, Greta A.
    role:
      role term: degree committee member.
  name:
    name part: Patterson, Comer O.
    role:
      role term: degree committee member.
  name:
    name part: Pommerville, Jeffrey C.
    role:
      role term: degree committee member.
  name:
    name part: Rizzo, Peter J.
    role:
      role term: degree committee member.
  name:
    name part: Texas A & M University
    role:
      role term: degree granting institution.
  type of resource: text
  genre: bibliography
  genre: Academic theses
  origin info:
    place:
      place term: xx
    date issued: 1986
    issuance: monographic
  language:
    language term: eng
  physical description:
    form: print
    extent: xiii, 164 leaves : illustrations ; 29 cm
  abstract: Peridinium balticum (Levander) Lemmermann is a binucleate dinoflagellate that harbors a photosynthetic chrysophyte. Two stages of the sexual life history, i.e. the gamete and zygote, were investigated using light and electron microscopy. Cytological features of these stages were compared with morphological and ultrastructural characteristics of the vegetative cell using information in the literature and from this study. A re-examination of the vegetative cell resulted in new information about five organelles. These included the endoplasmic reticulum (ER), trichocysts, peripheral vacuoles, Golgi apparatus, and cytoskeletal system. Gamete production was induced by transferring vegetative cells to a nitrogen deficient medium. Gametes were 10-15 μm in size and gymnodinioid in shape. Newly emerged gametes had a clear cytoplasm and few chloroplasts. Ultrastructurally, gametes were similar to vegetative cells, the major difference being chloroplast structure and thylakoid arrangement. Thylakoids were composed mostly of single lamellae. Often osmiophilic globules and pyrenoids were absent. Two morphologically distinct stages of the zygote were recognized and designated stage A and stage B. Stage A zygotes represented an early stage of fusion between gametes. They were a figure-8 in shape and had a pinwheel spin. Gamete position during fusion was specific, i.e. sulcal region ot apical region. Thecal plates invaginated along the length of the zygote and were dissolved, as were plates at the point of gamete contact. The dinokaryotic nuclei fused first and dissected chromosomes were observed in these nuclei. Stage B zygotes were elongated and were characterized by the two X-shaped fused cingula. Division of the fused dinokaryotic nucleus occurred at this stage; fusion of the eukaryotic nuclei followed. Changes observed concerning the fused eukaryotic nuclei included: (1) condensation of chromatin, (2) crystalline rod formation, and (3) a concentration of a less dense symbiont c…
  note: "Major subject: Botany."
  note: Typescript (photocopy).
  note: Vita.
  note: Ph. D. Texas A & M University 1986
  note: Includes bibliographical references (leaves 154-163).
  subject:
    topic: Algae
    topic: Reproduction
  subject:
    topic: Dinoflagellates
    topic: Reproduction
  subject:
    topic: Major botany
  identifier: http://proxy.library.tamu.edu/login
  identifier: https://hdl.handle.net/1969.1/DISSERTATIONS-19544
  related item:
    location:
      url: http://proxy.library.tamu.edu/login
  related item:
    location:
      url: https://hdl.handle.net/1969.1/DISSERTATIONS-19544
  record info:
    record content source: TXA
    record creation date: 880421
    record change date: 20220104090756.0
    record identifier: in00000011098
    language of cataloging:
      language term: eng