Photinus luciferin × Photinus luciferase = reddish light.
Photinus luciferin × Photuris luciferase = yellowish light.
Photuris luciferin × Photuris luciferase = yellowish light.
Photuris luciferin × Photinus luciferase = reddish light.
Thus the color of the light in these "crosses" is that characteristic of the animal supplying the luciferase. To bring this fact in line with what we have already said regarding reaction velocity and luminescence, we must believe that the Photinus luciferase oxidizes at a slower rate than the Photuris luciferase. In this connection it is of interest to recall that the Photuris light as emitted by the insect becomes reddish at high temperatures, or if the insect is plunged into alcohol, both conditions which bring about partial coagulation of the luciferase and reduce its active mass.
BIBLIOGRAPHY
A few of the enormous number of papers on luminescence are included in the list below. The attempt is made to list only those dealing with the structure, chemistry or physiology of luminous animals and the physical nature of their light, together with a small number of general interest. More complete works on light and luminescence come first and original articles follow. Authors' names are arranged alphabetically, their papers chronologically. A fairly complete list of literature covering the whole field of Bioluminescence is given by Mangold, 1910. The 1913 paper of Dubois gives a bibliography of his own contributions up to this date so that only those papers to which special reference is made are included below.