PHYLOGENETIC DISTRIBUTION OF INTRON POSITIONS IN ALPHA-AMYLASE GENES OF BILATERIA SUGGESTS NUMEROUS GAINS AND LOSSES.

Phylogenetic distribution of intron positions in alpha-amylase genes of bilateria suggests numerous gains and losses.

Most eukaryotes have at least some genes interrupted by introns.While it is well accepted that introns were already present at moderate density in the last eukaryote common ancestor, the conspicuous diversity of intron density among genomes suggests a complex evolutionary history, with marked differences here between phyla.The question of the rates

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Investigation of the Effect of Physical and Optical Factors on the Optical Performance of a Parabolic Trough Collector

The overall thermal performance of a Parabolic Trough Collector (PTC) depends on its optical performance, particularly the uniformity of the irradiance distribution and the resultant optical efficiency of the collector.Local Concentration Ratio (LCR), optical efficiency and average light concentration are three fundamental parameters of the optical

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