Production of chlorinated hydrocarbons and methyl iodide by the red microalga Porphyridium purpureum

Article Abstract:

Production of chlorinated hydrocarbons and methyl iodide has been studied in the red microalga Porphyridium purpureum. Axinic batch cultures grown in sealed 5-L glass containers with high-purity artificial atmosphere were used. Analysis for production of several halocarbons was carried out. Only chloroform and methyl iodide were produced in measurable quantities in two experiments, one at low light for 17 days and the other for 7 days at low light followed by 24 hours at high light. No stimulating effect was seen with high irradiance. Each experiment comprised two cultures and a control.

Algae, Light

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The importance of siderophores in iron nutrition of heterotrophic marine bacteria

Article Abstract:

Iron acquisition by seven strains of heterotrophic marine bacteria from a number of siderophore-iron complexes has been studied to evaluate the importance of siderophores for iron nutrition. Desferrioxamine B and marine siderophores partly purified from iron-limited cultures were considered. Iron dissolved in seawater binds to strong organic complexes with stability constants similar to those of microbial iron chelates. Results indicate bacteria may rely on siderophores to gain iron in situ.

Marine bacteria, Iron, Iron (Metal), Organometallic compounds

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Intercontinental allozyme differentiation among four holarctic Daphnia species

Article Abstract:

Allozyme differences among four Holarctic Daphnia species of Europe and North America are discussed. The study discussed showed that geographic isolation is apparently enough to minimize gene flow to levels where origin of new daphniid species can be considered and a revision of Holarctic daphniid taxonomy should be studied.

Europe, Czech Republic, North America, Statistical Data Included, Research, Analysis, Usage, Environmental aspects, Zooplankton, Identification and classification, Terminology, Evolution (Biology), Cladistic analysis, Origin of species, Population genetics, Isoenzymes, Zoology, Animal taxonomy, Isolating mechanisms, Continents

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