Eckhard Loos

Learn More
Little is known about the structure and function of oligosaccharides in cyanobacteria. In this study, a new class of saccharides from Nostoc was identified by MS and NMR techniques, consisting of alpha-D-glucopyranosyl-(1-->2)-[alpha-D-glucopyranosyl-(1-->2)]n-beta-D-fructofuranosides ranging from the trisaccharide (n = 1) to decasaccharide (n = 8). In(More)
A new class of galactooligosaccharides has been identified from the terrestrial cyanobacterium Nostoc commune by MS and NMR techniques. These consist of beta-D-galactofuranosyl-(1-->6)-[beta-D-galactofuranosyl-(1-->6)]n-beta-d-1,4-anhydrogalactitols with n ranging from 2 to 8, corresponding to compounds designated 1 through 7. In total these saccharides(More)
A cell-wall-degrading activity was solubilized from young cells and from mother cell walls of Chlorella fusca by treatment with LiCl. The cytoplasmic enzyme hexokinase was not detectable in these extracts. The LiCl-solubilized activity increased in the cell cycle parallel to the release of autospores. The enzyme was purified on a chromatofocusing column(More)
Chlorella sorokiniana strain 211-40c, a symbiotic Chlorella isolated from a freshwater sponge, excreted between 3% and 5% of assimilated (14)CO2 as glucose in the light, with a pH optimum around 5. This percentage increased when the illuminance was lowered (to 15% at 20 lx). Release of [(14)C]glucose continued in the dark and could be inhibited by the(More)
The soluble fraction of homogenates of synchronous Chlorella fusca was tested for carbohydrate-lyzing activities. With isolated cell walls and β-1,4-mannan or carboxymethyl cellulose as substrates, a sharp increase in activity occurred shortly before release of the daughter cells followed by a decline during release. The lytic activities were partially(More)
Chlorella sp. strain 3.83, a symbiotic Chlorella isolated from the heliozoan Acanthocystis turfacea, excreted between 8% and 16% of assimilated (14)CO2 as maltose in the light (15000 lx), with a pH optimum around 4.8. This percentage increased when the illuminance was lowered (36% at 1700 lx). Release of [(14)C]maltose continued in darkness and could be(More)
  • 1