The physiological changes produced by radium rays and ultra‐violet light in the egg of nereis

The Effect of Ultra-Violet Light Upon Early Development in Eggs of Urechis Caupo

“…An important factor appears to be the extent of the absorption of radiant energy by the inner protoplasm of the egg and by the superficial layer, each of which is a site of complex reactions which underlie morphological changes and developmental processes. Evidence presented by Redfield and Bright (1921) and Just (1933) shows an alteration of the initial changes involved in the cortical reaction in the egg of Nereis fertilized after exposure to ultra-violet light. Another type of evidence is given by Tchahotine (1921a), who correlated local centers of injury produced in the peripheral layer of sea urchin eggs with permeability changes.…”

AN APPRECIATION Of ALFRED C. REDFIELD AND HIS SCIENTIFIC WORK

“…Entered graduate school, graduating in 1918 1920 Elizabeth died -Aug 4 th 1921 Worked at the Cavendish Laboratory (UK) Field expedition in Peru 1922 Married Martha Putnam -June 7 th 1922 Moved to Milton, south of Boston 1923 Birth of Elizabeth Redfield -July 18 th 1926 Birth of Martha Washburn Redfield -March 7 th 1929 Birth of Alfred Guillou Redfield -March 11 th 1930 Joined the staff of WHOI 1930-31 Sabbatical along with family in Munich 1931 Moved to Cambridge. Mass.…”

“…Not an uncommon situation, but all too seldom recognized! HARvARD MEDICAL sCHOOL (1918)(1919)(1920)(1921)(1922)(1923)(1924)(1925)(1926)(1927)(1928)(1929)(1930)(1931) The chronology of events over the next few years is a little difficult to sort out and there are inconsistencies between the various accounts. What follows is as accurate as I am able to achieve.…”

The Relations of the Plasma Membrane, Vitelline Membrane, and Jelly in the Egg of Nereis Limbata

“…This, then, is in harmony with the simpler of the two above suggested explanations of the effect of alkaline NaC1; i.e., an effect of the hydroxyl ions on the jelly rather than on the membrane. This effect on the jelly is the explanation preferred by Redfield and Bright (1921) for the exaggerated membrane elevation produced in Nereis eggs by radiations. This explanation replaced their earlier view (1918) that radiations produce an abnormally thick fertilization membrane (swelling of the membrane due to intake of water) on the Nerds egg.…”