The patterns of uptake, retention, and tissue distribution of
⁹⁵mTc in two freshwater species, the crayfish Pacifastacus
leniusculus and the snail Juga silicula have been investigated. The
animals were chronically exposed in water to which sodium
pertechnetate had been added. Final whole-body concentration ratios
(CR) obtained were 1.6 and 41...
This study examined the effects of sire breed and
weight on the performance of 117 crossbred wether lambs
born at the Oregon State University Agricultural
Experiment Station, Corvallis. Lambs were produced by
mating Clun Forest,Polypay, Dorset, Border Leicester, and
Suffolk sires to Columbia-type ewes. After weaning at
approximately 90 days...
Delayed neutron counting (DNC) is a variation of neutron activation analysis applicable only to fissionable elements. Briefly, it
involves exposing a sample to the neutron flux in a reactor to induce
fission, then quickly retrieving the sample to count the delayed
fission neutrons emitted. These are proportional to the amount...
A registered flock of Hampshire sheep that had been predominantly
closed for approximately 30 years was utilized to study the
effects of inbreeding on productivity of the 1980 and 1981 lamb crops.
Five generation pedigrees for ewes and rams were used to calculate
inbreeding coefficients. The median inbreeding coefficient of...
There is an increasing world inventory of radiotechnetium (mainly
⁹⁹Tc) and it is inevitable that some of this will be released to the
environment. However, little is known about the environmental behavior
of this element.
This work examined technetium's behavior in two representative
freshwater species, the pearl mussel (Margaritifera margaritifera)...
This was a study designed to determine the occurrence of recovery
from radiation damage in Taricha granulosa. Irradiation with either
gamma or x-ray sources in the range of 96-10,000 rads was given. (The
mean or median survival times were determined.) Doses were fractionated
and the survival times for the same...
The testes of the gray-tailed vole (Microtus canicaudus Miller) exhibited a high affinity for selenium relative to other selected tissues. Uptake of selenium-75 in the testis-epididymis complex was delayed relative to uptake by the whole body, kidney, and liver. This pattern of uptake suggested that selenium was metabolically incorporated into...
A study was performed to assess the uptake and retention patterns
of cesium-134 in the gray-tailed vole, Microtus canicaudus Miller. To
furnish a realistic source of contaminated food for the voles, wheat
seedlings were raised in hydroponic solutions to provide radiocesium
labeled wheat clippings. The hydroponic system was designed to...
The uptake, tissue distribution and retention patterns of
cadmium, mercury and zinc were examined in the freshwater mussel,
Margaritifera margaritifera. All three of these heavy metals are
found in the environment. Both cadmium and mercury are toxic at
low environmental concentrations. Zinc may also be toxic at low concentrations
but...
The uptake, retention, and distribution of ⁶⁰Co, ⁶⁵Zn, ⁸⁵ Sr, and ¹³¹I was examined in the Rough-Skinned Newt (Taricha granulosa). Each of these radionuclides is a possible contaminant of the freshwater environment and, thus, is of importance in radioecology. The newts were maintained singly at 10° C in an unfed...