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  • seaweed  (153)
  • Springer  (153)
  • American Institute of Physics
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  • Springer  (153)
  • American Institute of Physics
  • American Meteorological Society
  • American Physical Society (APS)
  • Blackwell Publishing Ltd
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Erscheinungszeitraum
  • 2000-2004
  • 1995-1999  (43)
  • 1980-1984  (110)
  • 1955-1959
  • 1935-1939
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Jahr
  • 1
    Digitale Medien
    Digitale Medien
    Effect of LiCl on compression and tension properties ofPophyra perforata tissue (1996)
    Springer
    Journal of applied phycology 8 (1996), S. 247-252 
    Details
    ISSN: 1573-5176
    Schlagwort(e): compression ; LiCl ; Porphyra ; seaweed ; tension
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract The mechanical properties of various differentiated regions of thePorphyra perforata thallus and the effect of LiCl were studied by performing compression and tension tests. Among the various differentiated tissues, the holdfast area was high in its ‘compressive modulus of elasticity’ and ‘tensile modulus of elasticity’, possibly related to its thick matrix. Vegetative non-dividing tissue and vegetative dividing tissue were the most flexible and strong, showing the highest ‘percentage elongation at break’ and ‘tensile strength’. The patch area, which is a transition zone leading to sexually mature tissue, had moderate values of tensile properties. Meanwhile, sexually differentiated male and female tissues had the highest ‘compressive modulus of elasticity’ and lowest tensile properties. Thes tisues tended to crumble easily. Treatments in LiCl, as used for DNA extraction, resulted in a decrease in both ‘compressive modulus of elasticity’ (87%) and ‘tensile modulus of elasticity’ (54%). After treatment of tissue for chromosome staining in a method using LiCl, there was a marked decrease in ‘tensile modulus of elasticity’ (49%), while the ‘compressive modulus of elasticity’ remained unchanged. Such mechanical changes verify the softening effect of LiCl on the seaweedP. perforata tissue.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02184978
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  • 2
    Digitale Medien
    Digitale Medien
    sulfated polysaccharides from Durvillaea antarctica (1996)
    Springer
    Hydrobiologia 321 (1996), S. 77-81 
    Details
    ISSN: 1573-5117
    Schlagwort(e): seaweed ; Durvillaea antarctica ; sulfated polysaccharides ; fucose ; anticoagulant activity
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Durvillaea antarctica was extracted with hot water and a sulfate containing polymer was obtained after separation of laminaran and alginic acid with cetrimide and 2% calcium chloride solutions, respectively. Gel electrophoresis showed that the acidic polysaccharide (23.5% sulfate, 4.5% uronic acid) was not homogeneous. It was fractionated by anion-exchange chromatography on DEAE Sephadex with increasing concentrations of KC1 solutions affording seven fractions. All the fractions showed blood-anticoagulant activity. The fraction eluted with 1.2 M KC1 (34.85% sulfate, 1.4% uronic acid) showed the highest thrombin time. The plaque inhibition and the transcription assays of the whole acidic polysaccharide and the partial hydrolysis product against the infectious pancreatic necrosis virus showed a slight antiviral effect. The fucose-containing polymer from D. antarcica is a mixture of sulfated polysaccharides with a different content of sulfate groups and uronic acids. A correlation was observed between the anticoagulant effect uronic acids content.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00018679
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  • 3
    Digitale Medien
    Digitale Medien
    Recent trends of seaweed production in Chile (1996)
    Springer
    Hydrobiologia 326-327 (1996), S. 371-379 
    Details
    ISSN: 1573-5117
    Schlagwort(e): Chile ; cultivation ; exploitation ; Gracilaria ; landings ; seaweed
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract In the last fourteen years the production of seaweeds in Chile has ranged from 74 000 to 229 000 wet metric tons per year and has included about twenty species belonging to Phaeophyta and Rhodophyta. The only source of this production has been the exploitation of natural beds, except for Gracilaria, which is the only case of commercial cultivation and contributes significant quantities to total production. Initially most of the raw material was exported but currently important quantities of Gracilaria and several carrageenophytes are being processed by local industry. Changes in production of the main resources are analyzed with consideration of potential demand, level of knowledge about natural beds, and the situation of total Gracilaria farming, in order to attempt predictions for the supply. Current possibilities of applying new technologies to cultivate other economically important Chilean seaweeds are also analyzed and discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00047834
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  • 4
    Digitale Medien
    Digitale Medien
    Fusion and histocompatibility in Rhodophyta (1996)
    Springer
    Hydrobiologia 326-327 (1996), S. 387-392 
    Details
    ISSN: 1573-5117
    Schlagwort(e): fusion ; histocompatibility ; Rhodophyta ; seaweed
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Fully developed thalli of Chondrus crispus, Gracilaria chilensis, Gymnogongrus furcellatus and Mazzaella laminarioides were used to assess tissue compatibility. The effect of thallus polarity on grafting and regeneration was also evaluated. Fusion did occur between fragments of the same life history phase in C. crispus, G. chilensis, G. furcellatus and M. laminarioides. Fusion between sporophytic and gametophytic tissue occurred in C. crispus, G. chilensis and M. laminarioides. Intergeneric fusion was observed between C. crispus and M. laminarioides, but not between G. chilensis and G. furcellatus. Outer cell wall, cortex and medulla were continuous at the contact face in compatible combinations. Medullary cells in the attached fragments were thinner and longer than normal cells, forming an interwoven scar plate. Thallus polarity did not modify fusion and regeneration.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00047836
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  • 5
    Digitale Medien
    Digitale Medien
    Nuclear-encoded protein-coding genes of the agarophyte Gracilaria verrucosa (Gracilariales, Rhodophyta) (1996)
    Springer
    Hydrobiologia 326-327 (1996), S. 429-436 
    Details
    ISSN: 1573-5117
    Schlagwort(e): codon usage ; Gracilaria verrucosa ; intron ; nuclear protein-coding genes ; poly(A) signal ; promoter ; seaweed
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Single-copy nuclear genes encoding cytosolic glyceraldehyde-3-phosphate dehydrogenase (GapC), triosephosphate isomerase (TPI1) and polyubiquitin (UBI6R), plastid-localized GAPDH (GapA), and mitochondrial aconitase (m-ACN), together with their corresponding cDNAs, have been cloned or PCR-amplified from Gracilaria verrucosa, sequenced, and characterized by genomic Southern hybridization. Three spliceosomal introns were found, one each near the 5′ end of GapA, GapC, and m-ACN. Codon usage is biased, with third-position A's underrepresented. Nucleotide compositions of the genes are balanced except in TPI1. Upstream promoter structure, downstream poly(A) processing signals, intron splice junctions, and one translation initiation site were analyzed. Poly(A) processing features of these red algal genes resemble those of green plants more than those of animals.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00047842
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  • 6
    Digitale Medien
    Digitale Medien
    Dynamics of antibacterial activity in three species of Caribbean marine algae as a function of habitat and life history (1996)
    Springer
    Hydrobiologia 326-327 (1996), S. 457-462 
    Details
    ISSN: 1573-5117
    Schlagwort(e): antimicrobial activity ; Caribbean ; seaweed
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Antibacterial activity of lipid extracts from three species of Caribbean marine algae, Spyridia filamentosa, S. hypnoides and Wrangelia bicuspidata was evaluated monthly for one year. Activities were tested for whole plant extracts and TLC-separable zones. Whole plant extracts demonstrated monthly variability in activity with respect to both habitat and life history phase in addition to periods of similarity. No consistency was seen regarding activity against different microorganisms. TLC analyses of the extracts led to the identification of twenty-seven chromatographically distinct regions (TLC zones) each from both S. filamentosa and S. hypnoides and twenty-five from W. bicuspidata, which demonstrated antimicrobial activity. Between these species, twenty-one active TLC zones appeared to be shared based on their similar chromatographic characteristics. Individual TLC zones also demonstrated variable activity throughout the sampling period with respect to habitat and life history phase as well as periods of similarity. Algal antibiosis in these species is recognized as being highly complex, involving numerous chemical compounds, each of which is highly variable in terms of its presence and/or probable concentration.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00047846
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  • 7
    Digitale Medien
    Digitale Medien
    The acidic polysaccharide from Palmaria decipiens (Palmariales, Rhodophyta) (1996)
    Springer
    Hydrobiologia 326-327 (1996), S. 491-495 
    Details
    ISSN: 1573-5117
    Schlagwort(e): acidic polysaccharide ; Leptosomia simplex ; Palmaria decipiens ; Rhodophyta ; seaweed
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Palmaria decipiens, one of the most abundant red seaweeds of the chilean Antarctic, was collected in King George Island. The hot water extract (26% yield) showed by acid hydrolysis to contain xylose, galactose and traces of glucose. Fractionation with cetrimide gave a soluble neutral xylan and an insoluble fraction. The insoluble fraction afforded an acidic polysaccharide that contained 4.8% of uronic acids, 2.8% of sulfate and 18.9% of protein. Polyacrylamide gel electrophoresis showed that it was homogeneous. The GLC and HPLC analysis of the total acidic hydrolysis products showed that the acidic polysaccharide was composed of the neutral sugars galactose and xylose in the molar ratio 8.2:1.0 and of galacturonic and glucuronic acid in the ratio 1.5:1.0. The second-derivative FT-IR spectrum showed the characteristic amide I, II and III bands of proteins. Alkaline cleavage with 0.1 M NaOH indicated the presence of a glycoprotein with O-glycosidic linkage. Results found in this work suggest that the acidic polysaccharide extracted from Palmaria decipiens is an acidic xylogalactan-protein complex.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00047850
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  • 8
    Digitale Medien
    Digitale Medien
    Inorganic carbon acquisition by red seaweeds grown under dynamic light regimes (1996)
    Springer
    Hydrobiologia 326-327 (1996), S. 401-406 
    Details
    ISSN: 1573-5117
    Schlagwort(e): CO22 ; HCO inf3 sup− ; light ; Lomentaria ; Palmaria ; seaweed ; sunflecks
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Palmaria palmata, which is able to use HCO inf3 sup− as a carbon source for photosynthesis, and Lomentaria articulata, which is dependent on diffusive uptake of dissolved CO2, were grown under constant light and light with sunflecks designed to model wave-induced fluctuations of near-shore underwater light. Both species exhibited significantly increased stable carbon isotope discrimination (more negative values of δ13C relative to PDB) when grown with sunflecks. More negative δ13C values were associated with decreased growth rate of P. palmata but not of L. articulata. The contrasting effects of sunflecks on the carbon-use characteristics of the two species are discussed in terms of the energetic cost of HCO inf3 sup− use and the susceptibility of CO2 diffusion-dependent species to photoinhibition.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00047838
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  • 9
    Digitale Medien
    Digitale Medien
    Xanthophyll-cycle and photosynthetic adaptation to environment in macro- and microalgae (1996)
    Springer
    Hydrobiologia 326-327 (1996), S. 407-413 
    Details
    ISSN: 1573-5117
    Schlagwort(e): diatoxanthin ; Gracilaria ; photoinhibition ; phytoplankton ; seaweed ; xanthophyll-cycle ; zeaxanthin
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Microalgae and macrophytes adapt their pigment content to the environment because excessive light could limit their photosynthetic rate by inducing photoinhibition. Carotenoids participate in the photoadaptative response especially through the operation of xanthophyll cycles (violaxanthin-zeaxanthin or diadinoxanthin-diatoxanthin). An increasing gradient of diatoxanthin in phytoplankton chromophytes is found from the inshore to the offshore waters, less turbid in relation to the different light penetration in seawater. In addition, a nyctemeral cycle is noted, with a suppression of diatoxanthin at night and its accumulation with the increase of the light. Similarly the vertical distribution, on the French Brittany coasts, of several Gracilaria and Gracilariopsis species corresponds to increasing zeaxanthin amounts in the seaweeds living at the upper zones, which are more resistant to photoinhibition as shown by fluorescence and oxygen evolution analysis. An operating xanthophyll cycle should be regarded as a regulatory mechanism involved in stress response for the dissipation of excessive excitation energy through deepoxidated xanthophylls such as zeaxanthin or diatoxanthin.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00047839
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  • 10
    Digitale Medien
    Digitale Medien
    The effect of phosphate concentration on growth and agar content of Gelidium robustum (Gelidiaceae, Rhodophyta) in culture (1996)
    Springer
    Hydrobiologia 326-327 (1996), S. 437-443 
    Details
    ISSN: 1573-5117
    Schlagwort(e): agar ; agarophyte ; Gelidium ; phosphate ; Rhodophyta ; seaweed
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Phosphate concentration of the growth medium was found to affect the growth rate and agar yield of a clone of Gelidium robustum grown in the laboratory. To study differences in growth we used phosphate concentrations from 0 to 200 µM. To determine the effect of phosphate on agar yield and its properties we used concentrations from 0 to 20 µM. Growth rates generally increased with increasing phosphate concentration, with the highest growth rate (21% d−1) obtained at 150 µM. Agar yield as percentage of fresh weight was highest (10%) in the algae grown with low phosphate concentrations, but agar yield as percentage of dry weight was highest(43%) at 20 µM of phosphate. Gel strength increased with phosphate concentration with a maximum of 160 g m−2 for 0.75% gels for the cultures at 20 µM. Melting and gelling temperatures of the gels were also affected by phosphate concentration of the growth medium. Starch yield was highest in algae grown in low phosphate concentrations.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00047843
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