Quantity variations in pigments and lipid classes were determined
following γ-irradiation of Micrococcus radiodurans, Sarcina
lutea, and Pseudomonas aeruginosa.
Pigmentation was determined by extraction with organic solvents
and measured as optical density at 475 mμ for M. radiodurans
and S. lutea, and 410 mμ for Ps. E aetuginosa. Pigments of...
A model is developed that allows the prediction of the stress-strain
distribution in a mixed carbide sphere pac fuel pin during
irradiation. The model is coupled with a previously developed model
for the thermal behavior of the pin. The one-dimensional (radial at
various axial locations) solution is for quasi-steady pin...
The increasing use of medical procedures using ionizing radiation has increased significantly in recent years. In 1987, the National Council on Radiation Protection Report 93 (NCRP) reported that the average exposure ionizing radiation was 53mRem/year (0.53mSv/year). In their most recent study on radiation exposures NCRP Report 160 in 2009, the...
Many experiments are being conducted to find compounds that offer radioprotection against radiation damage and that are also non-toxic. It is hopeful that in the future, research for this technology will benefit patients undergoing cancer treatment by reducing radiation damage to normal cells and therefore reducing short and long term...
Although it is generally assumed that the intensifying abiotic environment is the primary effect of drought on aquatic organisms, drought-induced top predator extinctions may be an important underlying mechanism. I used manipulative experiments to disentangle the impacts of drying and top predator extinctions on arid-land aquatic invertebrate communities. I then...
Olive ridley sea turtles (Lepidochelys olivacea) present an interesting case study of the conservation of wildlife species that aggregate in high densities and have served as resources for human consumption. Ridleys exhibit synchronized mass-nesting behavior,
during events called "arribadas," where thousands of females lay eggs together in a small area...
Honeybees and honey combs are good indicators of environmental contamination and can be important for dose calculations. In the event of reactor accidents and nuclear weapon testing, the released radioactive materials are likely to be transported through various environmental pathways as well as by humans and animals, including bees. Due...
Bees provide critical pollination services to diverse agricultural crops, native plants and trees. Globally, there are reports of bee declines which have been attributed to diseases, exposure to pesticides and changes in land use that are believed to have led to a reduction in foraging resources and nesting habitats for...
I investigated the relationship between harlequin duck (Histrionicus histrionicus) behavior and lack of recovery from the Exxon Valdez oil spill in Prince William Sound, Alaska. First, I evaluated the hypothesis that harlequin ducks in winter have little flexibility to increase foraging time in response to disturbance because they are constrained...