In order to develop an understanding of the evolutionary history of introns, we compared intron sequences from homologous genes of di erent vertebrate species. We observed the following statistical features of introns. From interspecies comparisons, the length difference of an intron from each gene exhibits considerable variations, which is in consistent with the previous observation on the wid...

Chloroplast transcription in land plants relies on collaboration between a plastid-encoded RNA polymerase (PEP) of cyanobacterial ancestry and a nucleus-encoded RNA polymerase of phage ancestry. PEP associates with additional proteins that are unrelated to bacterial transcription factors, many of which have been shown to be important for PEP activity in Arabidopsis (Arabidopsis thaliana). Howev...

An evaluation is made of the complementarity between two non-invasive techniques, cuticle microhistological analysis (CMA) and PCR-capillary electrophoresis (PCR-CE) DNA-based analysis, for determination herbivore diet composition from faecal samples. Cuticle based on different microanatomical characteristics epidermal fragments remaining in faeces. The PCR-CE technique combines PCR amplificati...

A distinctive new species, Sesuvium curassavicum Sukhor. (Aizoaceae: Sesuvioideae), restricted to the Caribbean Basin (Kingdom of Netherlands: Curaçao and Bonaire Islands, North Colombia: La Guajira Department, Venezuela: Falcón State), is described illustrated. It differs from all other perennial species growing in West Indies by its papillate stems wrinkled seeds. Based on molecular phylogene...

Spontaneous, 2-aminopurine- and 5-bromouracil-induced mutations at six rII nonsense codons were studied in phage T4 strains possessing wild-type and mutant gene 43 alleles. The mutation pathways studied included interconversions and reversions of nonsense codons. The tsCB87 allele, which specifies an antimutator DNA polymerase, reduced base-analogue-induced mutation frequencies along all pathwa...

In order to develop an understanding of the evolutionary history of introns, we compared intron sequences from homologous genes of di erent vertebrate species. We observed the following statistical features of introns. From interspecies comparisons, the length difference of an intron from each gene exhibits considerable variations, which is in consistent with the previous observation on the wid...

Discriminant analysis is applied to the problem of recognition 5'-, internal and 3'-exons in human DNA sequences. Specific recognition functions were developed for revealing exons of particular types. The method based on a splice site prediction algorithm that uses the linear Fisher discriminant to combine the information about significant triplet frequencies of various functional parts of spli...