Restriction analyses were conducted on mitochondrial DNA (mtDNA) amplified by long-PCR from an endangered bird, the Cape Sable seaside sparrow. The first of several successful mtDNA amplifications was accomplished using the partially digested tissue remains of a transmitter-monitored bird retrieved from the gut of a snake. As many as 91 mtDNA restriction fragments produced by 18 endonucleases w...

background: avian influenza (ai) viruses have been isolated from a wide diversity of free-living avian species representing several orders. since 1998, h9n2 ai outbreaks have been one of the major problems in iranian poultry industry. in 2006, h5n1 was reported in swans in the north of iran first , but until now there has been no official report from commercial flocks in iran. objectives: the a...

Drosophila geneticists have uncovered roles for microRNAs in the coordination of cell proliferation and cell death during development, and in stress resistance and fat metabolism. In C. elegans, a homolog of the well-known fly developmental regulator hunchback acts downstream of the microRNAs lin-4 and let-7 in a pathway controlling developmental timing.

Temporal sequences of transcription factors (tTFs) in Drosophila neural progenitors generate neuronal diversity. Mattar et al. (2015) identify Casz1/Castor as a late temporal identity factor in mouse retinal progenitors that is regulated by the early factor Ikzf1/Hunchback, thus generalizing the notion of tTFs.

Millions of Lyme disease vector ticks are dispersed annually by songbirds across Canada, but often overlooked as the source of infection. For clarity on vector distribution, we sampled 481 ticks (12 species and 3 undetermined ticks) from 211 songbirds (42 species/subspecies) nationwide. Using PCR, 52 (29.5%) of 176 Ixodes ticks tested were positive for the Lyme disease spirochete, Borrelia burg...

KROODSMA, D. E. 1977. A re-evaluation of song development in the Song Sparrow. Anim. Behav. 25390-399. MARLER, P., M. KREITH, AND M. TAMURA. 1962. Song development in hand-raised Oregon Juncos. Auk 79: 12-30. MARLER, P., P. MUNDINGER, M. S. WASER, AND A. LUTJEN. 1972. Effects of acoustical stimulation and deprivation on song development in Redwinged Blackbirds (Agelaius phoeniceus). Anim. Behav...