The gastrula of the sea urchin Strongylocentrotus purpuratus
was dissociated into single cells. In culture these cells appeared
apolar, but reassembled into quasi-normal embryos composed of
structures with polarized cells. In this study emphasis was placed on
those morphological events coincident with the reestablishment of a
polar orientation within the...
Alkylation of propylene oxide with 2-lithiofuran gave alcohol I,
which was smoothly converted to acetylfuran II. hydrogenation of II
over rhodium on charcoal followed by Jones' oxidation afforded ketone
III. Further transformation into IV was accomplished via a Wittig
reaction followed by saponification with methanolic sodium hydroxide.
Hydroboration of the...
One of the unique problems associated with salmon gillnet fishing
is of preventing the fouling of the boat's propeller in the net and
associated fishing gear. Presently, the solution to this problem has
been the addition of a basket type propeller guard which may produce
a drag increase of 50...
The central problem of the study was to explore the relationship
between the minimum competencies and characteristics chosen by
child development specialists as necessary for a child care aide and
those sought by child care center directors when hiring an aide. A
survey instrument was developed consisting of 49 basic...
Field studies to determine appropriate cutting management
regimes consistent with yield, quality, and persistence
of stand were conducted on several alfalfa varieties in the
Columbia Basin region of Oregon.
Two groups of treatments, including consecutive cuts at
the same stage of maturity and cuts made at varying maturities,
were imposed...
The thesis area is located southwest of Portland, Oregon, in the
Western Cascades. In the area are volcaniclastic rocks and lava flows
that range in composition from basaltic andesite to dacite. The dominant
volcaniclastic rock type is thin intracanyon ash-flow tuff. The
dominant lava flows are a thick sequence of...