Results 221 to 230 of about 13,650 (237)
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Effects of dietary mercury and lead on eggshell thickness in mallards
Bulletin of Environmental Contamination and Toxicology, 1974Experiments were performed to determine whether mercury and lead in the diet of captive mallards (Anas platyrhynchos) would increase the eggshell thinning above that caused by DDE alone. DDE alone caused a 15% reduction in shell thickness, but neither Pb and Hg contributed significantly to mallard eggshell thinning, nor did these compounds appear to ...
M A, Haegele, R K, Tucker, R H, Hudson
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Avian eggshell thickness: scaling and maximum body mass in birds
Journal of Zoology, 2009AbstractThe avian eggshell represents a highly evolved structure adapted to the physiological requirements of the embryo and the potential fracturing forces it is exposed to during incubation. Given its many roles, it is not surprising that the eggshell is also central to the current hypothesis about maximum avian body mass.
G. F. Birchard, Charles Deeming
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Langmuir, 2019
The eggshell membrane is one of the easily obtainable natural biomaterials, but has been neglected in the biomaterial community, compared with marine biomaterials and discarded as a food waste. In this work, we utilized the ESM hydrolysate (ESMH), which was obtained by the enzymochemical method, as a bioactive functional material for interfacial ...
Seulbi Kim +3 more
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The eggshell membrane is one of the easily obtainable natural biomaterials, but has been neglected in the biomaterial community, compared with marine biomaterials and discarded as a food waste. In this work, we utilized the ESM hydrolysate (ESMH), which was obtained by the enzymochemical method, as a bioactive functional material for interfacial ...
Seulbi Kim +3 more
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COMPARISON OF BREAKING STRENGTH AND SHELL THICKNESS AS EVALUATORS OF EGGSHELL QUALITY
Environmental Toxicology and Chemistry, 1988Abstract The shell quality of eggs produced by northern bobwhite (Colinus virginianus) dosed with sulfanilamide was evaluated by a compression breaking strength test and by the shell thickness measurements that are used in the U.S. Environmental Protection Agency avian reproduction test to determine the effect of a chemical substance on ...
Jewel K. Bennett +4 more
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Eggshell Thickness Changes in Pacific Ocean Phaethontidae and Sulidae
The Condor, 1979Pesticide-induced eggshell thinning and associated reproductive problems have been documented in several species of the Pelecaniformes. Numerous populations of Brown Pelicans (Pelecanus occidentalis) and Double-crested Cormorants (Phalacrocorax auritus) have been adversely affected by pesticides, especially DDE (Anderson et al. 1969, Stickel 1973, Blus
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Distinguishing Hooded Merganser and Wood Duck Nests by Eggshell Thickness
The Journal of Wildlife Management, 1987Although eggshells of hooded mergansers (Mergus cucullatus) and wood ducks (Aix sponsa) are difficult to distinguish by color, I found that eggshell thickness (0.541 vs. 0.255 mm, respectively) provided reliable identification. J. WILDL. MANAGE. 51(3):534 Distinguishing nesting species of ducks during winter maintenance of nest houses can be difficult.
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Eggshell Thickness and Its Variation in the Cedar Waxwing
1972(Uploaded by Plazi from the Biodiversity Heritage Library) No abstract provided.
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Eggshell thickness and reproduction in American kestrels exposed to chronic dietary lead
Archives of Environmental Contamination and Toxicology, 1984American kestrels (Falco sparverius) were randomly paired and fed 0, 10, or 50 ppm metallic lead in their diet from November 1979–May 1980. Lead levels were elevated in bones and livers of birds receiving the treated diets, particularly the 50 ppm treatment group.
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The Wilson Journal of Ornithology, 2018
ABSTRACT Sources of measurement error using analog thickness gauges include differences in eggshell thickness at the points of measurement, imperfections in the micrometer within the limits specified by the manufacturer, imperfections or contamination of the eggshells, and human error in applying and reading the (analog) instrument.
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ABSTRACT Sources of measurement error using analog thickness gauges include differences in eggshell thickness at the points of measurement, imperfections in the micrometer within the limits specified by the manufacturer, imperfections or contamination of the eggshells, and human error in applying and reading the (analog) instrument.
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Eggshell Thickness in Pheasants Given Dieldrin
The Journal of Wildlife Management, 1970Robert B. Dahlgren, Raymond L. Linder
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