Search PubMed⌕ Search

Biomedical subjects

D L Fox

Publications and source records attributed to D L Fox.

32 records · Page 2Linked to original sources
PubMed1965

Absence or singular specificity of carotenoids in some lower fishes.

No colored carotenoids were recovered from the scales or liver of the coelacanth, Latimeria chalumnae, or from skin, immature eggs, or liver of the Pacific hagfish, Eptatretus stoutii. Zeaxanthin, present as esters in the skin and largely unesterified in the liver, was the only carotenoid identified in the thornback ray, Platyrhinoidis triseriata, and in the horned shark, Heterodontus francisci, whereas the skin of the Pacific mako shark, Isurus glaucus, yielded no carotenoids.

Animals↗
PubMed1965

Reversible, light-screening pigment of elasmobranch eyes: chemical identity with melanin.

There lies directly beneath the tapetum lucidum, in the eyes of many elasmobranch fishes, a layer of darkly pigmented choroid cells which, in bright light, extend individual strands that aggregate to form a dark, compound curtain which shields the reflecting tapetal cells. This process is reversed in dim light or in darkness; the tapetum is exposed and visual sensitivity presumably Increased. The black choroid pigment has been isolated, analyzed, and shown to possess the properties of melanin.

Animals↗
PubMedDate not supplied

Do waste incinerators induce adverse respiratory effects? An air quality and epidemiological study of six communities.

The purpose of the study presented here was to simultaneously measure air quality and respiratory function and symptoms in populations living in the neighborhood of waste incinerators and to estimate the contribution of incinerator emissions to the particulate air mass in these neighborhoods. We studied the residents of three communities having, respectively, a biomedical and a municipal incinerator, and a liquid hazardous waste-burning industrial furnace. We compared results with three matched-comparison communities. We did not detect differences in concentrations of particulate matter among any of the three pairs of study communities. Average fine particulate (PM2.5) concentrations measured for 35 days varied across study communities from 16 to 32 micrograms/m3. Within the same community, daily concentrations of fine particulates varied by as much as eightfold, from 10 to 80 micrograms/m3, and were nearly identical within each pair of communities. Direct measurements of air quality and estimates based on a chemical mass balance receptor model showed that incinerator emissions did not have a major or even a modest impact on routinely monitored air pollutants. A onetime baseline descriptive survey (n = 6963) did not reveal consistent community differences in the prevalence of chronic or acute respiratory symptoms between incinerator and comparison communities, nor did we see a difference in baseline lung function tests or in the average peak expiratory flow rate measured over a period of 35 days. Based on this analysis of the first year of our study, we conclude that we have no evidence to reject the null hypothesis of no acute or chronic respiratory effects associated with residence in any of the three incinerator communities.

Adolescent↗