We recorded 4,188 events of human activity and associated bald eagle (Haliaeetus leucocephalus) response in the vicinity of 13 central Arizona nest sites during 1983-85. A hierarchical classification of 9 dependent and 3 independent parameters was developed to quantify pedestrian, aquatic, vehicle, noise (gunshot/sonic boom), and aircraft disturbance groups. Type and frequency of response varie...

On two standard views of vagueness, vagueness as to whether Harry is bald entails that nobody knows whether Harry is bald—either because vagueness is a type of missing truth, and so there is nothing to know, or because vagueness is a type of ignorance, and so even though there is a truth of the matter, nobody can know what that truth is. Vagueness as to whether Harry is bald does entail that no...

Organochlorine chemical residues and elemental concentrations were measured in piscivorous and benthivorous fish at 111 sites from large U.S. river basins. Potential contaminant sources such as urban and agricultural runoff, industrial discharges, mine drainage, and irrigation varied among the sampling sites. Our objectives were to provide summary statistics for chemical contaminants and to det...

When present in multiple copies, orf1590 restored sporulation to class IIIA bald mutants of Streptomyces griseus, which form sporulation septa and thick spore walls prematurely. The orf1590 alleles from class IIIA bald mutants restored sporulation upon introduction at a high copy number into those same mutants, and the nucleotide sequence of one of these alleles was identical to that of the wil...

The history of Southern Appalachian grassy balds has long been a topic of speculation. Two types have been identified: those completely covered by grass and those occupied by a mixed-hardwood overstory with a grassy herbaceous layer. Three areas historically known as balds were identified in the Wine Spring Ecosystem Project Area. Each is currently under a different management regime. The objec...

As urban and wild lands come into increasingly closer contact and as demands on wildlife and other natural resources increase, effective and sound ecological management of these resources becomes more critical. This is particularly true in Southeast Alaska where timber harvesting and coastal development continue to threaten Bald Eagle (Haliaeetus leucocephalus) populations. No longer can we sim...

The patient was a 13-year-old female. Six years previously, she developed alopecia areata when her parents divorced. One year after that, the bald area drastically expanded when her mother remarried. She was treated at her local hospital; however, no improvement was observed. She then visited our hospital for examination. A bald patch was covering >80% of her head. Self Grow-Up Egogram indicate...

The relationship between regional reproduction rates of bald eagles (Haliaeetus leucocephalus) and concentrations of p.p'-dichlorodiphenyldichloroethylene (p,p'-DDE) and total polychlorinated biphenyls (PCBs) in blood plasma from nestling bald eagles was assessed. Blood was analyzed from 309 nestlings from 10 subpopulations of eagles across the Great Lakes region. Geometric mean concentrations ...