The effect of lifting date and root-pruning treatments on
water potential, root regeneration, and shoot growth of six-month-old
and three-year-old Douglas-fir seedlings bare-root transplanted
into a growth chamber, and sawdust bed, respectively, was studied.
Root growth in six-month-old and three-year-old seedlings was
highest in February and August respectively. Survival was...
Chemical dosimetry developed in response to needs created by
developments in the field of high-energy radiation. Shortly after the
discovery of X-rays in 1895 and of radioactivity in 1896, the deleterious
effects of ionizing radiation were recognized. To guard against the
injurious effects of radiation in medical application, dose-measuring
methods...
Oregon Biography Index is intended to serve primarily as a starting point in locating biographies of Oregonians. We have indexed 47 historical volumes which are either entirely devoted to biographies or have large self-contained biographical sections. The profiles in the books vary widely in accuracy and detail. Birth dates of...
In the mild climate of the Pacific Northwest, the harvesting of
deciduous shade trees in wholesale nurseries is prolonged from
October to January because of autumn growth and prolonged leaf
retention. Economically, it is advantageous to defoliate nursery trees
at the earliest possible date. Premature defoliation, however, can
cause die...
The purpose of the study was to prepare and statistically
evaluate a series of 11 history of science case studies designed to
teach the following abilities involved in scientific thinking:
1. Recognizing problems, hypotheses, experimental conditions,
and conclusions.
2. Understanding the relationship of evidence to hypotheses.
3. Understanding experimental conditions...
The North American species of the shore fly genus Notiphila Fallen were taxonomically revised. Over 13,000 specimens were examined from throughout the Nearctic Region and information relating to the biology of many species occurring in the West was gathered from both field and laboratory studies. Previously used characters were reevaluated;...