Note to users. If you're seeing this message, it means that your browser cannot find this page's style/presentation instructions -- or possibly that you are using a browser that does not support current Web standards. Find out more about why this message is appearing, and what you can do to make your experience of our site the best it can be.

Science 19 November 1971:
Vol. 174. no. 4011, pp. 835 - 838
DOI: 10.1126/science.174.4011.835
Prev | Table of Contents | Next

Articles

Silkworm Bombyx mori L.: Nature of Diapause Factor

Haruyuki Sonobe 1 and Eiji Ohnishi 1

1 Biological Institute Faculty of Science, Nagoya University, Nagoya, Japan

The diapause factor which is responsible for the induction of embryonic diapause in the silkworm (Bombyx mori L.) was isolated from the heads of female moths. It was extracted with 80 percent ethanol or 80 percent methanol and was heat-stable and not dialyzable. Since the active material was precipitated with ammonium sulfate and lost when incubated with proteolytic enzymes, it is highly probable that the diapause factor is a protein or a complex molecule containing peptide bonds. Molecular sieve techniques revealed two species of the diapause factor. The molecular weight of the smaller species lies between 5,000 and 10,000.

To Advertise     Find Products

Science. ISSN 0036-8075 (print), 1095-9203 (online)