The effects of five tillage treatments on soil bulk density and
mechanical impedance were examined on Newburg sandy loam soil in the
Willamette Valley, Oregon, in 1987. Subsequent effects on seedling
emergence and yield of carrots (Daucus carota L., cvs. Orlando Gold
and Royal Chantenay) were also measured. Mechanical impedance...
Many methods in use today for the isolation, purification, and
identification of the staphylococcal enterotoxins involve lengthy
steps with significant loss of enterotoxin, are subject to interference
from contaminating sample components, and lack sufficient specificity.
Culture extracts of enterotoxin producing Staphylococcus
aureus strains (enterotoxins A-E), crude enterotoxin preparations
(enterotoxins A-E),...
5'-Deoxy-5'-methylthioadenosine phosphorylase catalyzes
the phosphorolytic cleavage of 5'-deoxy-5'-methylthioadenosine
to form 5'-deoxy-5'-methylthioribose-1-phosphate and
adenine in mammalian cells and plays an important role in
methionine and purine salvage. The enzyme is abundant in
normal tissues and in cell lines derived from normal cells.
However, several malignant tissues and cell lines have been...
A well-defined, quantitative model for determining soil contrast
was developed to improve soil survey interpretations concerning the
effects of mixtures of different kinds of soils on agricultural land
use. The model was evaluated by determining the levels and reasons
for soil contrast on mapped soil areas representing 5 different
landscapes,...
It has long been observed that stress can increase our
susceptibility to infectious diseases and cancers. Recent
experimental evidence suggests that this increased susceptibility is
due to suppression of immunity. A variety of neuroendocrine products
are released during periods of stress, and a large number of these
are now known...
The bandgap voltage reference technique, as implemented in Silicon technology, has evolved to a state of advanced development and become the method of choice for temperature independent voltage biasing in integrated circuits. The heterojunction bipolar transistor (HBT), fabricated from epitaxial A1GaAs /GaAs, is developing to a point where basic circuit...
PART I. The concentration of nickel in some soils may be
insufficient to meet the requirements of enzymes such as
urease in soybeans and hydrogenase in Rhizobium. Nickel
availability in soils was examined by measuring microbial
urease activity in soils which were treated with glucose
and urea. Supplemental nickel was...
Studies were conducted over a two year period to evaluate alternative
finishing methods for spring and fall-born beef cattle. Management
alternatives from birth to slaughter included season of calving, lactating
cow nutrition, preweaning calf nutrition, weaning age, calf and
yearling winter nutrition, range and irrigated pasture supplementation,
grazing practice, range...