A previous report (1) has indicated that Rhoeo discolor is susceptible to infection only by tobacco mosaic virus ribonucleic acid but not by the complete virus; however, recently Bawden (2)’ has obtained evidence that the intact virus can also multiply in this host. The present report indicates that these contradictory results are due to extreme differences in the physiological state of the hos...

Two complete genomes of beak and feather disease virus (BFDV) were characterized from Lathamus discolor, the Australian swift parrot. This is the first report of BFDV complete genome sequences in this host. The completed BFDV genomes consist of 1,984 nucleotides encoding two open reading frames with 99.7% pairwise nucleotide identity.

A taxonomic study of the genus Alchornea in Antioquia, Colombia, is presented. Fifteen species are included, three which (Alchornea brittonii, A. bogotensis. and discolor) new records for department. morphological characterization, a identification key, full descriptions, geographic distribution notes provided.

Bacterial, mechanical, or chemical irritation to the pulp may result in tissue necrosis and release of disintegration by-products that may penetrate tubules and discolor the surrounding dentin. The degree of discoloration is directly related to how long the pulp has been necrotic. The longer the discoloration compounds are present in the pulp chamber, the greater the discoloration. Such discolo...

A previous report (1) has indicated that Rhoeo discolor is susceptible to infection only by tobacco mosaic virus ribonucleic acid but not by the complete virus; however, recently Bawden (2)’ has obtained evidence that the intact virus can also multiply in this host. The present report indicates that these contradictory results are due to extreme differences in the physiological state of the hos...

• The mycorrhiza of orchids represents an energy source that may replace or supplement photosynthesis. Dependency on mycotrophy in adult life stages would thus be expected to be inversely related to the prevalence of phototrophic structures. • The phenology of underground parts and mycorrhizal infection were monitored in five terrestrial species differing in leaf phenology (and thus in phototro...

Navigating on the wing in complete darkness is a challenging task for echolocating bats. It requires the detailed analysis of spatial and temporal information gained through echolocation. Thus neural encoding of spatiotemporal echo information is a major function in the bat auditory system. In this study we presented echoes in virtual acoustic space and used a reverse-correlation technique to i...