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PubMed2002

Isolation and biochemical characterization of extracellular polymeric secretions (EPS) from modern soft marine stromatolites (Bahamas) and its inhibitory effect on CaCO3 precipitation.

Bahamian soft marine stromatolites consist of cyanobacterial biofilms and carbonate sand grains (ooids) embedded in their extracellular polymeric secretions (EPS). EPS were isolated from natural marine stromatolites and the laboratory cultured stromatolite forming cyanobacterium isolate Schizothix sp. Laboratory investigations were conducted to examine biochemical characteristics and the role of EPS in the inhibition of CaCO3 precipitation. EPS consisted of acid polysaccharides and proteins. SDS-PAGE and amino acid analysis suggested that EPS from both soft marine stromatolite and Schizothrix sp. mat contained small proteins (38 kD and 45 kD) enriched in aspartic acid and glutamic acid. Also, immuno blotting suggested that natural EPS contain high molecular weight acid polysaccharide (500 k) which may represent cross-linked products of laboratory cultured Schizothrix sp. acid polysaccharide (300 k). EPS from both soft marine stromatolite and laboratory cultured Schizothrix sp. inhibited CaCO3 precipitation in vitro, as determined using pH drift assays examining pH decrease which occur in response to CaCO3 precipitation. PH drift assays of enzymatically and chemically modified EPS isolated from soft marine stromatolite and laboratory cultured Schizothrix sp. indicated that both uronic acids and protein fractions may be involved in the inhibition of CaCO3 precipitation.

Amino Acids↗
PubMed1989

Congenital human immunodeficiency virus (HIV) infection in the Bahamas.

In the 13-month period between June 1985 and July 1986, 27 children were found to be HIV positive in the Princess Margaret Hospital in Nassau. Nineteen of the children had clinical AIDS, four were in the prodromal phase and four were symptom free. The clinical course of these infants is presented. Of the 18 mothers 16 were screened and were all seropositive and asymptomatic. They remained healthy in spite of subsequent pregnancies in nine of them (56%) during a follow-up period of between 13 and 65 months (mean 40 months). Fifteen of the 18 mothers were Haitian but only three had other risk factors, throwing doubt on the value of selective screening in Afro-Caribbean countries.

AIDS-Related Complex↗
PubMed1997

Staurojoenina and other symbionts in Neotermes from San Salvador Island, Bahamas.

Staurojoenina, a conspicuous hypermastigote protist (undocumented in any Neotermes) and other hindgut symbionts are reported for the first time in Neotermes nr. jouteli, a dry-wood-eating termite (Kalotermitidae), from the red mangroves at the northeast corner of San Salvador Island. Other distinctive protists (Macrotrichomonas, Metadevescovina, two morphotypes of small trichomonads) and bacteria (Arthromitus-type filamentous spore-formers) symbionts were also found in this termite. This Staurojoenina sp. replete with epibiotic bacterial symbionts is not distinguished from previously described species of Staurojoenina.

Animals↗
PubMed1984

The Bahamas.

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Americas↗