1. Inicio
  2. Atrás
Título: Physiological and physical changes of protoplasm during meiosis and mitosis in pollen mothercells of Trillium.
Autores: Stern, Herbert.
Fecha: 1945
Publicador: McGill University - MCGILL
Fuente:
Tipo: Electronic Thesis or Dissertation
Tema: Mitosis.
Meiosis.
Trilliums.
Descripción: Ever since the recognition of mitosis as the mechanism of nuclear division, its importance in biological development, whether normal growth and reproduction or pathological production of tumours and cancers, has led to a great deal of inquiry into its nature. The manner or treatment at any period was determined, to a large extent, by the available techniques of investigation and, to a lesser but still important degree, by the facility with which known and utilizable material lent itself to a given type of approach. Accordingly, early research workers concentrated their attack upon the morphology of mitosis, a study which now provides a very detailed and fairly complete description of the microscopically visible structural characteristics of cell and nucleus during their cycle of division. Recent research has, in a sense, leap-frogged to the more ultimate constituents or the cell, namely the protein molecules and their allied substances, and has by means of techniques adapted from those of physics and chemistry investigated molecular structure and orientation in protoplasmic constituents, and analyzed the chemical components of nucleus and cytoplasm. The gap between these mutually remote techniques is one that has to be filled by a study of the cell - “in vivo”, that is, by means of physiological data. Not that such knowledge is entirely lacking, but as a bridge between the other two approaches it is still highly inadequate. [...]
Idioma: en