Showing papers on "Lyngbya majuscula published in 1992"

Microcolins A and B, new immunosuppressive peptides from the blue-green alga Lyngbya majuscula.

Abstract: Microcolin A [1] and microcolin B [2] are new immunosuppressive lipopeptides isolated from a Venezuelan sample of the blue-green alga Lyngbya majuscula. The microcolins are potent inhibitors of the murine mixed lymphocyte response and murine P-388 leukemia in vitro. Isolation and structure elucidation of 1 and 2 by nmr, mass spectral, and chemical methods are described.

Lyngbya infestations: comparative taxonomy of lyngbya wollei comb. nov. (cyanobacteria)1

Abstract: Conflicting taxonomic identifications of an extremely large-celled (width: 24.9–64.4 μm, length: 2.0–11.5 μm), filamentous, mat-forming cyanobacterium prompted a search for an accurate taxonomic identity. This alga was reported by various workers as Plectonema wollei Far-low ex Gomont, Lyngbya majuscula Harvey ex Gomont, Lyngbya magnifica Gardner, Lyngbya birgei Smith, Lyngbya latissima Prescott, and Microcoleus lyngbyaceus (Kutzing) Crouan sensu Drouet. Quantitative analyses of cellular morphology, evaluation of habitat preference, and growth form were used to characterize the organism. Descriptions and taxonomic histories of this organism and the six described taxa were compared. The organism is identified as Plectonema wollei Far-low ex Gomont according to most existing botanical taxonomic systems. However, this identification places undue emphasis on the extremely variable characteristic of false branching, which varies seasonally and with growth status. To eliminate the confusion inherent in basing taxonomy upon an environmentally variable characteristic, identification as Lyngbya wollei (Farlow ex Gomont) comb. nov. is recommended.