Ribonucleotide reductase from Rhizobium meliloti has been
partially purified and characterized. The enzymatic reduction of
ribonucleotides to deoxyribonucleotides is dependent upon B₁₂ coenzyme
and dihydrolipoate.
B₁₂ coenzyme was more effective than B₁₂ coenzyme analogues
in the reductase reaction. The affinity of the R. meliloti
reductase system for B₁₂ coenzyme was...
This thesis examines food insecurity in Oregon among food bank users over the course of The Great Recession. Analyzing data from the Oregon Food Bank, this thesis tells the story of the change that the recession brought upon low-income families. In examining the regional differences in food insecurity, the local...
Experiments are reported which demonstrate that a cobalt deficiency
in R. meliloti results in a decreased cytochrome content of
bacterial cells. It is concluded that the effect of cobalt deficiency
on cytochrome content of Rhizobium cells and on the leghemoglobin
content of nodules possibly may be explained by an effect...
Glutamine synthetase activity is present in both the cytosol and
bacteroid fractions of soybean root nodules. Total activity measurements
indicate that at least 90% of the activity in nodules is located
in the cytosol. Results reported by McParland, et al. (29), showed
that many properties of glutamine synthetase from nodule...
The purpose of this study was to determine if a significant
difference in cognitive achievement and retention occurred when skeletal
system anatomy and terminology were presented utilizing either videotaped
presentations or a traditional laboratory procedure.
Fifty-three first semester nursing students enrolled in biology
(Bio. 160 anatomy and physiology) at Lethbridge...
The purpose of this study was to assess the effectiveness of a
training program designed to assist Thai junior high school science
teachers in asking a larger number of higher cognitive level
questions, extending wait-time following a question, and decreasing
the amount of teacher talk during classroom instruction.
Sixty-two junior...
The purpose of this study was (a) to develop a valid and reliable attitude
toward science instrument for use with Arabic male students at the secondary
school level, (b) to determine the differences in their attitudes toward science and
in their achievement, and (c) to determine the relationship between measures...
The purpose of this study was to develop an instrument to provide valid and
reliable measures of misconceptions in the area of photosynthesis and respiration
among fourth, fifth, and sixth grade students in Thailand. A 17-item, two-tier
multiple-choice test was developed and validated using construct-related evidence to
determine the appropriateness...
The use of selected computer games was studied as an
intervention technique in an attempt to increase achievement
of learning disabled adolescents in basic multiplication And
division facts. A multiple baseline design across subjects
with a follow-up was employed in an applied behavioral
setting. The subjects were two female and...