GaAs MESFETs are widely used in high speed integrated circuits (ICs) and
microwave circuits. Due to the materials and processing methods used in GaAs
MESFET fabrication, deep level traps in the substrate materials have a strong influence
on device performance.
In this work we used the drain current transient characterization...
Polyacrylamide gel disc electrophoresis of concentrated culture
media which had supported growth of Clostridium botulinum
types A and B was shown to be effective in separating the toxin
molecules from hemagglutinating molecules. Since the hemagglutinins
of the two types are immunologically identical and are present
in toxin and toxoid preparations,...
The purpose of this study was to compare and evaluate personal
attitudes and perceptions, educational and vocational plans, activities
and satisfaction among students of two basic groups selected for the
study: a) financial aid recipients, b) non-financial aid recipients.
Subgroups in each category consisted of over-achievers and under-achievers.
Over-achievers were...
Disc gel electrophoresis of the vegatative cell -free extracts ofstrains of Clostridium botulinum types A, B, C, E, and F and therelated nontoxic group showed limited value as a means for identifyingthese closely related microorganisms, since separation,though not consistent in all cases, could only be based on the numberof protein...
Forced vital capacity lung expiration examinations of nonsmoking
and cigarette-smoking male sample populations were compared to
determine if the 75 to 85 percent segment was a more sensitive test
of early lung dysfunction. The nonsmoking population was composed
of 240 men who were tested for values of forced vital capacity...
Studies were conducted under controlled conditions in order
to observe the resulting survival patterns in solid crabmeat of
Salmonella typhosa, Salmonella paratyphi B, and SaImonella wichita
following individual exposure to various doses of gamma radiation.
As shown in their survival curves, these species of Salmonella
exhibited in varying degrees a...
Grass seed production in Oregon's Willamette Valley traditionally relied on open field burning for straw residue disposal and nutrient recycling. Changes in residue management from open field burning to methods that remove straw coincided with rapidly declining K soil test values. A survey of grass seed fields showed that many...