Inhibition of reverse transcriptase activity by extracts of cultured blue-green algae (cyanophyta).

Lipophilic and hydrophilic extracts of over 900 strains of cultured blue-green algae (cyanophyta) were examined in vitro for their ability to inhibit the reverse transcriptases (RT) of avian myeloblastosis virus (AMV) and human immunodeficiency virus, type 1 (HIV-1). Eighteen (2.0%) aqueous extracts showed activity against AMV and HIV RTs.

Y enriched and Y specific DNA sequences from the genome of the Mediterranean fruit fly, Ceratitis capitata.

DNA sequences that are enriched or specific to the genome of the male medfly, Ceratitis capitata, have been isolated using a differential hybridization approach. Twelve phage clones from a genomic library have been identified that consistently display more intense hybridization with a genomic DNA probe from males as opposed to one from females. Southern DNA blot analysis reveals that these recombinant clones contain at least one EcoRI fragment that is either specific to the male genome, or more highly represented in it, as compared with the female genome.

Actin genes in the Mediterranean fruit fly, Ceratitis capitata.

We have undertaken the study of actin gene organization and expression in the genome of the Mediterranean fruit fly (medfly), Ceratitis capitata. Actin genes have been extensively characterized previously in a wide range of eukaryotic organisms, and they have valuable properties for comparative studies. These genes are typically highly conserved in coding regions, represented in multiple copies per genome and regulated in expression during development.