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  • Organic Chemistry  (3)
  • macrofauna  (3)
  • 1995-1999  (5)
  • 1960-1964  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Intertidal zonation of benthic macrofauna in a subtropical salt marsh and nearby unvegetated flat (SE, Brazil) (1997)
    Springer
    Hydrobiologia 353 (1997), S. 171-180 
    Details
    ISSN: 1573-5117
    Keywords: zonation ; macrofauna ; salt marsh ; tidal flat ; ParanaguáBay ; Brazil
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Intertidal zonation and seasonal variability of benthic macrofaunawere analysed along a Spartina alterniflora (Loisel) marshand nearby unvegetated flat in a subtropical bay. Fivereplicate samples were taken along six tidal levels from the uppermarsh, limited by mangroves, to the lower unvegetated flat.Sediment composition, live and dead above- and below-ground biomassof S. alterniflora and detritus biomass from the vegetatedand unvegetated areas were determined to evaluate whethervariations on plant structure and detritus along the 25 m transectaffect the dynamics of benthic invertebrates. Composition andabundance of invertebrates varied with the elevation and plantcover clearly plays a key role on the distribution patterns of themacrofauna. Below-ground and dead above-ground biomass presentedthe highest correlation with the densities of the invertebrates.Vertical distribution of benthic fauna, however, appears not to beaffected by bellow-ground fraction. Higher detritus biomass in theupper unvegetated flat coincided with higher densities ofdetritivorous or omnivorous species in this level. An eruptivealgal growth during summer affected positively most of the dominantspecies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003090701675
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  • 2
    Electronic Resource
    Electronic Resource
    The role of above- and below-ground components of Spartina alterniflora (Loisel) and detritus biomass in structuring macrobenthic associations of Paranaguá Bay (SE, Brazil) (1999)
    Springer
    Hydrobiologia 400 (1999), S. 167-177 
    Details
    ISSN: 1573-5117
    Keywords: macrofauna ; Spartina alterniflora ; salt marsh ; detritus biomass ; tidal flat ; Paranaguá Bay ; Brazil
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The influence of Spartina alterniflora marshes and detritus availability on the spatial structure and time variability of macrobenthic associations was investigated in Paranaguá Bay, a subtropical estuary in southern Brazil. Four sampling sites were established along the salinity and exposure gradient of Paranaguá Bay in the winter and summer of 1992. At each site, 5 samples (0.02 m2corer) were taken in the salt marshes and adjacent unvegetated tidal flats. Sediment composition, salt marsh structure (stem height and density, live and dead above- and below-ground biomass of S. alterniflora) and vegetal detritus biomass were determined to assess whether they can affect the dynamics of macrobenthic invertebrates. The development of salt marshes and the amount of detritus, the latter mainly originated from adjacent mangroves, were determined by the energy and salinity gradients along the bay. Plant above- and below-ground components, together with detritus biomass, exert a strong influence on the composition and distribution of macrofauna in Paranaguá Bay. Salt marshes support higher densities and species number of macrobenthic invertebrates. Multivariate analyses showed that oscillations of different fractions of Spartina alterniflora, as well as detritus availability, affect the different components of macrobenthic associations in a variable degree. Spatial and temporal shifts of infaunal organisms appear to be more evident than those of mobile epibenthic forms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003753001411
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  • 3
    Electronic Resource
    Electronic Resource
    The role of above- and below-ground components of Spartina alterniflora (Loisel) and detritus biomass in structuring macrobenthic associations of Paranaguá Bay (SE, Brazil) (1999)
    Springer
    Hydrobiologia 400 (1999), S. 167-177 
    Details
    ISSN: 1573-5117
    Keywords: macrofauna ; Spartina alterniflora ; salt marsh ; detritus biomass ; tidal flat ; Paranaguá Bay ; Brazil
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The influence of Spartina alterniflora marshes and detritus availability on the spatial structure and time variability of macrobenthic associations was investigated in Paranaguá Bay, a subtropical estuary in southern Brazil. Four sampling sites were established along the salinity and exposure gradient of Paranaguá Bay in the winter and summer of 1992. At each site, 5 samples (0.02 m2corer) were taken in the salt marshes and adjacent unvegetated tidal flats. Sediment composition, salt marsh structure (stem height and density, live and dead above- and below-ground biomass of S. alterniflora) and vegetal detritus biomass were determined to assess whether they can affect the dynamics of macrobenthic invertebrates. The development of salt marshes and the amount of detritus, the latter mainly originated from adjacent mangroves, were determined by the energy and salinity gradients along the bay. Plant above- and below-ground components, together with detritus biomass, exert a strong influence on the composition and distribution of macrofauna in Paranaguá Bay. Salt marshes support higher densities and species number of macrobenthic invertebrates. Multivariate analyses showed that oscillations of different fractions of Spartina alterniflora, as well as detritus availability, affect the different components of macrobenthic associations in a variable degree. Spatial and temporal shifts of infaunal organisms appear to be more evident than those of mobile epibenthic forms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003753001411
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  • 4
    Electronic Resource
    Electronic Resource
    Regioselective Enzyme-Mediated Glycosylation of Natural Polyhydroxy Compounds. Part 1. Galactosylation of stevioside and steviolbioside (1997)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 80 (1997), S. 1153-1160 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Bovine β-1,4-galactosyltransierase is an efficient catalyst for the regioselective transfer of galactose from UPD-galactose, generated in situ with the UDP-glucose/UDP-glucose-4-epimerase system, to the kaurane glycosides stevioside (1) and Steviolbioside (2), affording the corresponding galactosyl derivatives 3 and 4 in high yields. By a combination of 2D NMR techniques (COSY, TOCSY, ROESY, HMQC, and HMBC), the structure of the products is established as 13-[(β -D-galactopyranosyl-(1 → 4)-β-D-glucopyranosyl-(1 → 2)- β -D-glucopyranosyl)oxy]kaur-16-en-19-oic acid β -D-glucopyranosyl ester (3) and 13-[(β-D-galactopyranosyl-(1 → 4)- β-D-glu-copyranosyl-(1 → 2)- β-D-glucopyranosyl)oxy]kaur-16-en-19-oic acid (4).
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19970800412
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  • 5
    Electronic Resource
    Electronic Resource
    Ground- and excited-state prototropic tautomerism in anils of aromatic α-hydroxy aldehydes studied by electronic absorption, fluorescence and 1H and 13C NMR spectroscopies and semi-empirical calculations (1995)
    Chichester : Wiley-Blackwell
    Journal of Physical Organic Chemistry 8 (1995), S. 713-720 
    Details
    ISSN: 0894-3230
    Keywords: Organic Chemistry ; Physical Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Proton transfer processes in both the ground and excited states in anils of aromatic α-hydroxyaldehydes (salicylaldehyde, 2-hydroxynaphthalene-1-carbaldehyde and the novel 10-hydroxyphenanthrene-9-carbaldehyde) have been studied by a combination of spectroscopic techniques. Solution 1H and 13C NMR is used to establish the position of the tautomeric equilibria. UV-visible absorption and fluorescence spectral data help to characterize the existence, in all cases, of excited-state intramolecular proton transfer (ESIPT) pheonmena. Semi-empirical calculations involving full geometry optimization and calculation of heats of formation for the ground state (AM1) and vertical excitation energies and oscillator strengths (INDO/S) are in agreement with the experimental observations.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/poc.610081104
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  • 6
    Electronic Resource
    Electronic Resource
    Zur Kenntnis der Benzol-o-disulfonamide (1960)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 636 (1960), S. 18-20 
    Details
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Es wird die Darstellung asymm. Trisulfonamide aus m-Chlor-anilin beschrieben. Die hergestellten Verbindungen zeigen keine diuretische Aktivität. Die Sulfonierung des m-Chlor-anilins mit Chlorsulfonsäure wird untersucht.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.19606360103
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