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  • Articles  (56)
  • 1995-1999  (52)
  • 1970-1974  (4)
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  • Articles  (56)
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  • 1
    Electronic Resource
    Electronic Resource
    Metal polymers (1996)
    Springer
    Polymer bulletin 37 (1996), S. 175-182 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary Styrene-co-butyl methacrylate colloids were obtained by codeposition at 77 K of the monomers with several metals such as Pd, Au, Ag, Cu, Zn, Cd, Ga, In, Ge, Sn, Sb and Bi. The colloids were copolymerized with different amounts of initiator (BPO) at 65°C for 3.0 h and a wide range of viscosity average molecular weights (Mv, 104–105 g/mol) were obtained depending upon the metal used. The metal colloid concentration and stability are reported. A medium particle size of 60-244 Å comonomer colloids was found. The thermal stability and metal composition are also described. The copolymers are stable even at 380°C, Ga- poly(styrene-co-butyl methacrylate) being the most stable with 418°C. The metal content is ranging between 0.10 and 2.26% w/w for the highest MW fraction and between 0.20 and 2.41% w/w for the lowest MW fraction. Copolymers with different colors were obtained depending on the metal used.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00294119
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  • 2
    Electronic Resource
    Electronic Resource
    Cadmium concentrations in human renal cortex tissue (Necropsies) (1995)
    Springer
    Bulletin of environmental contamination and toxicology 54 (1995), S. 841-847 
    Details
    ISSN: 1432-0800
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00197968
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  • 3
    Electronic Resource
    Electronic Resource
    Determination of Lead and Cadmium Content in the Rice Consumed in Maracaibo, Venezuela (1997)
    Springer
    Bulletin of environmental contamination and toxicology 59 (1997), S. 94-98 
    Details
    ISSN: 1432-0800
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001289900449
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  • 4
    Electronic Resource
    Electronic Resource
    Production and properties of three pectinolytic activities produced by Aspergillus niger in submerged and solid-state fermentation (1995)
    Springer
    Applied microbiology and biotechnology 43 (1995), S. 808-814 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract  Three extracellular pectinases were produced by Aspergillus niger CH4 by submerged and solid-state fermentation, and their physicochemical and kinetic properties were studied. The highest productivities of endo- and exo-pectinase and pectin lyase were obtained with solid-state fermentation. The kinetic and physicochemical properties of these enzymes were influenced by the type of culture method used. All activities were very different in terms of pH and temperature optima, stability at different pH and temperature values and affinity for the substrate (K m values). In solid-state fermentation, all pectinase activities were more stable at extreme pH and temperature values but the K m values of endo-pectinase and pectin lyase were higher with respect to those activities obtained by the submerged-culture technique. The pectin lyase activity obtained by the submerged-culture technique showed substrate inhibition but the enzyme obtained by solid-state fermentation did not. Electrophoresis, using sodium dodecyl sulphate/polyacrylamide gel with enzymatic extracts obtained for both culture methods, showed the same number of protein bands but some differences were found in their electrophoretic position. The results obtained in this work suggest that the culture method (submerged or solid-state) may beresponsible for inducing changes in some of thepectinolytic enzymes produced by A. niger.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002530050489
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  • 5
    Electronic Resource
    Electronic Resource
    Production and properties of three pectinolytic activities produced byAspergillus niger in submerged and solid-state fermentation (1995)
    Springer
    Applied microbiology and biotechnology 43 (1995), S. 808-814 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract Three extracellular pectinases were produced byAspergillus niger CH4 by submerged and solid-state fermentation, and their physicochemical and kinetic properties were studied. The highest productivities of endo- and exo-pectinase and pectin lyase were obtained with solid-state fermentation. The kinetic and physicochemical properties of these enzymes were influenced by the type of culture method used. All activities were very different in terms of pH and temperature optima, stability at different pH and temperature values and affinity for the substrate (K m values). In solid-state fermentation, all pectinase activities were more stable at extreme pH and temperature values but theK m values of endo-pectinase and pectin lyase were higher with respect to those activities obtained by the submerged-culture technique. The pectin lyase activity obtained by the submerged-culture technique showed substrate inhibition but the enzyme obtained by solid-state fermentation did not. Electrophoresis, using sodium dodecyl sulphate/polyacrylamide gel with enzymatic extracts obtained for both culture methods, showed the same number on protein bands but some differences were found in their electrophoretic position. The results obtained in this work suggest that the culture method (submerged or solid-state) may be responsible for inducing changes in some of the pectinolytic enzymes produced byA. niger.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02431912
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  • 6
    Electronic Resource
    Electronic Resource
    Biotechnological management of coffee pulp - isolation, screening, characterization, selection of caffeine-degrading fungi and natural microflora present in coffee pulp and husk (1995)
    Springer
    Applied microbiology and biotechnology 42 (1995), S. 756-762 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract A total of 272 strains of filamentous fungi were isolated from soil, leaves of coffee plants and coffee cherries collected in coffee-growing areas of Mexico on three semi-synthetic culture media containing coffee extract, coffee extract with sucrose and coffee pulp extract. The isolated strains were purified by conventional techniques and identified by microscopic examination. Strains were selected on the basis of their caffeine-degrading ability in well-defined liquid medium containing caffeine. Most of the isolated microorganisms belong to Aspergillus, Penicillium, Trichoderma, Fusarium, and Humicola genera. Five strains belonging to Aspergillus species and two strains belonging to Penicillium species had the ability to degrade almost 100% of the caffeine in liquid medium. A comparative study on the evaluation of natural microflora present in coffee pulp and coffee husk revealed the presence of a wide variety of microorganisms. The percentage distribution of fungi, bacteria and yeast was almost similar in all the samples, except in coffee husk where the fungal population was slightly higher than in the other two samples. The yeast population was predominant when the coffee pulp was lyophilized immediately after pulping. However, there was a wide diversity in the microbial population with respect to selective media containing functional nutritional groups like cellulose, starch and pectin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002530050327
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  • 7
    Electronic Resource
    Electronic Resource
    Biotechnological management of coffee pulp — isolation, screening, characterization, selection of caffeine-degrading fungi and natural microflora present in coffee pulp and husk (1995)
    Springer
    Applied microbiology and biotechnology 42 (1995), S. 756-762 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract A total of 272 strains of filamentous fungi were isolated from soil, leaves of coffee plants and coffee cherries collected in coffee-growing areas of Mexico on three semi-synthetic culture media containing coffee extract, coffee extract with sucrose and coffee pulp extract. The isolated strains were purified by conventional techniques and identified by microscopic examination. Strains were selected on the basis of their caffeine-degrading ability in well-defined liquid medium containing caffeine. Most of the isolated microorganisms belong to Aspergillus, Penicillium, Trichoderma, Fusarium, and Humicola genera. Five strains belonging to Aspergillus species and two strains belonging to Penicillium species had the ability to degrade almost 100% of the caffeine in liquid medium. A comparative study on the evaluation of natural microflora present in coffee pulp and coffee husk revealed the presence of a wide variety of microorganisms. The percentage distribution of fungi, bacteria and yeast was almost similar in all the samples, except in coffee husk where the fungal population was slightly higher than in the other two samples. The yeast population was predominant when the coffee pulp was lyophilized immediately after pulping. However, there was a wide diversity in the microbial population with respect to selective media containing functional nutritional groups like cellulose, starch and pectin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00171958
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  • 8
    Electronic Resource
    Electronic Resource
    Thermal behaviour of benzenesulfenamides and of their chromium carbonyl complexes (1996)
    Springer
    Journal of thermal analysis and calorimetry 46 (1996), S. 1875-1880 
    Details
    ISSN: 1572-8943
    Keywords: chromium carbonyl complexes ; sulfenamide complexes ; thermal analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Benzenesulfenamides with the formula R-S-N-(R′)2 (R=C6H5 andR′=NC4H8O, C7H7 and C6H11) and their chromium carbonyl complexes were studied by means of TG and mass spectrometric methods. The thermal behaviour of the compounds the stabilities of free sulfenamides are lower than those observed for the corresponding chromium carbonyl complexes. Combined thermogravimetry — mass spectrometry results suggest that the fragmentation mechanism of the carbonyl complexes involves cleavage of the Cr-S and Cr-CO bonds while that of sulfenamide depends mainly on the dissociation rates of the NR2 groups.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01980790
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  • 9
    Electronic Resource
    Electronic Resource
    Presence of sauvagine-like epitopes in the interrenal gland of the bullfrog Rana catesbeiana (1995)
    Springer
    Cell & tissue research 283 (1995), S. 117-123 
    Details
    ISSN: 1432-0878
    Keywords: Key words: Sauvagine ; Corticotropin-releasing factor ; Immunocytochemistry ; Interrenal gland ; Rana catesbeiana (Anura)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract. Immunocytochemistry was used to investigate the presence of corticotropin-releasing factor-like peptides in the interrenal (adrenal) glands of the bullfrog Rana catesbeiana by using specific antisera raised against synthetic nonconjugated rat/human corticotropin-releasing factor, urotensin I, and sauvagine. From these three antisera, covering a broad range of corticotropin-releasing factor-like immunoreactivities, only the sauvagine antiserum gave positive immunoreactivity. Sauvagine immunoreactivity was found in cortical cells grouped into cords in the renal zone of the interrenal gland. The central and subcapsular cords were less stained. Tyrosine hydroxylase-positive chromaffin cells were not sauvagine-immunoreactive. The immunoreactivity was abolished, in all cases, by previous immunoabsorption of the sauvagine antiserum with synthetic sauvagine (0.1 μM), but it was not eliminated by sucker (Catostomus commersoni) urotensin I, sole (Hippoglossoides elassodon) urotensin I, sucker corticotropin-releasing factor, rat/human corticotropin-releasing factor, or ovine corticotropin-releasing factor (0.1–10 μM). In a sauvagine radioimmunoassay, interrenal extracts displaced 125I-sauvagine from antiserum only partially, and not in parallel with the sauvagine standard curve. The results suggest that the sauvagine immunoreactivity in the R. catesbeiana interrenal gland may represent a novel sauvagine-like peptide.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004410050519
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  • 10
    Electronic Resource
    Electronic Resource
    Preparative isolation ofSolanum tuberosum L. glycoalkaloids by MPLC (1997)
    Springer
    Potato research 40 (1997), S. 413-416 
    Details
    ISSN: 1871-4528
    Keywords: α-chaconine ; α-solanine ; potato
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary A new, efficient and economic method employing Medium Pressure Liquid Chromatography (MPLC) for the isolation of the two majorSolanum tuberosum L. glycoalkaloids (α-solanine and α-chaconine) is described. Potato peelings are homogenised with 5% acetic acid, the glycoalkaloids purified by filtration through an XAD-2 column and then by precipitation from the aqueous solution. The resulting glycoalkaloid fraction was purified by MPLC using a Silica Gel column and a CHCl3:MeOH:2% NH4OH mixture (70∶30∶5) as mobile phase to yield pure α-chaconine and a-solanine. This methodology can be used to obtain glycoalkaloids for enthomology and toxicological research where large amounts of these compounds are required.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02358001
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