The central nervous system of Phidippus, while comparable to that
of other spiders in most respects, is distinguished by the extraordinary
development of visual processing centers, associated with the
complex visually-directed behavior of these animals.
The primary neuropile of the anterior medial eyes consists of two
distinct columnar synapsing regions....
A study was made to clarify the relationships of Mentzelia mollis
Peck and two poorly understood taxa of Mentzelia (Loasaceae) to the
other members of the genus, its sections, and its subsections, and
to describe the general ecology of each taxon.
Within the genus, the section Trachyphytum is characterized by...
Channel maintenance operations in the rivers and harbors of the
United States annually require the disposal of over 320 million cubic
meters of dredge spoils. As the availability of suitable land sites
diminishes, open water disposal presents an attractive yet controversial
alternative method. For open water disposal to be acceptable,...
Nut drop in the filbert is a consequence of the senescence of the
husk. It is possible to accelerate this process by the application of
ethephon (2-chloroethyl)phosphonic acid after the nut has abscised
from the base of the husk. This study is an investigation on the physiological
effects of the...