Experiments were conducted to determine if the plagiotropic
growth habit of rooted cuttings of Douglas-fir might result from a
system favoring the accumulation of indoleacetic acid in the adaxial
side of the shoot in response to vertical placement.
Actively growing excised branch terminals were subjected to
gravitational disorientation to determine...
Adaptive immune capabilities of the Urochordate S. montereyensis
were studied. Animals repeatedly injected with bacteria were bled and
the following properties were measured in vitro: agglutinin, bactericidin,
bacteria-cell association. Both Gram (+) and Gram (-) bacteria
were isolated from the gut of S. montereyensis and used as antigens at
10⁸...
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....
2 -acetylaminofluorene -induced hepatocarcinogenesis in rats
proceeds in stages of initiation and promotion, similar to experimental
systems, in mouse skin. In this study promoters of liver
tumorigenesis, phenobarbital, DDT and butylated hydroxytoluene
(BHT), were compared to non-promoters, amobarbital, diphenylhydantoin
(DPH) and benz(a)anthracene (BA), for their ability to
cause liver growth...
A study has been made of the vertical distributions and
migrations of a large number of zooplankton species at Weather
Station "P" in the Subarctic Pacific. Simultaneously towed horizontal
opening-closing nets were used for the study. The distributions
and migrations of 104 taxa have been subjectively grouped
into seven basic...
Jean Baptiste Lamarck (1744-1829) is considered here in the
context of the Enlightenment effort to develop a science of man. His
Philosophie zoologique (1809) and the Systeme analytique (1820) are
the two principal relevant works examined in depth to discover how
he meant to base a science of man on...