Waterfowl brood surveys were conducted in the Pah River Flats, Alaska during July of 1995. Duck production was not significantly different between plots burned in a 1992 wildfire and unburned plots for the third year following the burn. Fire did not produce any statistically detectable positive or negative effects on waterfowl production or habi­ tat in the first three years following the fire....

1. What are this patient’s most striking clinical and laboratory findings? 2. How do you explain this patient’s most striking clinical and laboratory findings? 3. What is this patient’s most likely diagnosis? 4. What are the criteria for making this diagnosis? 5. What are anti-nuclear antibodies (ANAs), how is their presence in a patient’s serum determined, how is the test for ANAs interpreted,...

Patients with juvenile chronic arthritis (JCA) may be subdivided into a minority, who carry IgM rheumatoid factor and have erosive polyarthritis resembling adult rheumatoid arthritis, and the majority (90%), who are seronegative by conventional means. Between 30 and 60% of patients with JCA have positive antinuclear antibodies (ANAs) according to the choice of substrate for indirect immunofluor...

migratory birds can become long-distance vectors for a wide range of microorganisms. the objective of the present study was to investigate the presence of cryptococcus neoformans in the cloacae, crop and nasal cavity of migratory birds in order to assess their role as potential reservoirs and/or mechanical vectors of human and animal cryptococcosis. a total of 700 samples (cloacae, crops and na...

The intermediate hosts for Sarcocystis rileyi (Stiles 1893) Minchin 1913 are ducks (Anas spp.), and the striped skunk (Mephitis mephitis) is its definitive host. The structure of sarcocysts from an experimentally infected shoveler duck (Anas cylpeata) fed sporocysts from an experimentally-infected M. mephitis was studied and compared with type specimens from a naturally infected duck. The exper...

To investigate the previously postulated association of systemic lupus erythematosus (SLE) and porphyria 38 patients with various types of porphyria were investigated for clinical and laboratory evidence of a connective tissue disease. Antinuclear antibodies (ANAs) were found in 8/15 (53%) patients with acute intermittent porphyria. These patients were more likely to have had a recent acute att...

Human B cells that coexpress surrogate and conventional light chains (V-preB+L+) show an unusual heavy and light chain antibody repertoire that display evidence of receptor editing. However, it is unclear whether V-preB+L+ B cells have been silenced by receptor editing or still express autoreactive antibodies. Here we report that 68% of the antibodies expressed by V-preB+L+ B cells are autoreac...

Heteropatric differentiation is a mode of speciation with gene flow in which divergence occurs between lineages that are in sympatry and allopatry at different times during cyclic spatial movements. Empirical evidence suggests that heteropatric differentiation may prove to be common among seasonally migratory organisms. We examined genetic differentiation between the sedentary Aleutian Islands ...