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Biomedical subjects

R W Johnson

Publications and source records attributed to R W Johnson.

252 records · Page 14Linked to original sources
PubMedDate not supplied

Elimination of endrin by mallard ducks.

Endrin is very toxic to birds and has been implicated in the deaths of birds in nature. However, it is not known how rapidly birds eliminate endrin, a factor important in determining how much is accumulated in tissues. In this study, the loss rate of endrin was followed for 64 days in mallard (Anas platyrhynchos) drakes that had been fed 20 ppm endrin for 13 days. The loss from carcass and blood was described by the equation Y = a e b square root of x where Y = the concentration of endrin in ppm, a = the concentration at day 0, e = the base of natural logarithms, b = the first order rate constant for the elimination process, and x = the number of days after cessation of endrin treatment. Endrin was lost rapidly at first; concentrations in carcasses on a wet-weight basis decreased by 50% in the first 3 days. Thereafter, endrin was eliminated more slowly; elimination of 50% of the remainder required 8.9 days, and it took 32.9 days to lose 90% of the original amount.

Animals↗
PubMedDate not supplied

The impact of thermal injury.

From data collected by the Regional Burn Treatment Center at UCSD in San Diego and Imperial Counties in California, the incidence and economic cost of thermal injuries are extrapolated to the entire United States in order to estimate the impact of thermal injury on the public health.

Burns↗
PubMedDate not supplied

The role of the historically black college and university (HBCU) in student learning.

This article takes a brief view of the role of Historically Black Colleges and Universities (HBCUs) in the teaching/learning of African American students. The article also presents Mrs. Ray Kornegay's view on her personal experience at a Historically Black College/University. Mrs. Kornegay's views are congruent with the espoused beliefs found in the article.

Black or African American↗