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  • 1
    Electronic Resource
    Electronic Resource
    Densities, molar volumes, cubic expansion coefficients, and isothermal compressibilities of 1-alkanols from 323.15 to 373.15 K and at pressures up to 10 MPa (1993)
    s.l. : American Chemical Society
    Journal of chemical & engineering data 38 (1993), S. 227-230 
    Details
    ISSN: 1520-5134
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/je00010a010
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  • 2
    Electronic Resource
    Electronic Resource
    Spectral and thermal studies on copper(II) complexes of acenaphthaquinonemono(4-methylquinolinyl) hydrazone (1992)
    Springer
    Journal of thermal analysis and calorimetry 38 (1992), S. 1433-1446 
    Details
    ISSN: 1572-8943
    Keywords: complexes ; coordination chemistry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Cu(II)-komplexe von Acenaphthoquinonmono(4-methylquinolinyl)hydrazon (AMH) der allgemeinen Zusammensetzung [CULX2] (mitL= AMH;X=Cl, Br, I, OAc oder NO3) (beim Sulfatokomplex lautet die Zusammensetzung [CuLSO4]2) wurden hergestellt und mittels Elementaranalyse, Messungen des magnetischen Momentes, Konduktivitätsmessungen, IR-, Elektronen- und EPR-Spektroskopie sowie mittels Thermoanalyse beschrieben. Für alle Komplexe wurde eine planare Geometrie nachgewiesen. Die TG-Kurven zeigen eine Zersetzung in einem Schritt, an dessen Ende die Bildung von CU2O steht.
    Notes: Abstract Cu(II) complexes of acenaphthaquinonemono(4-methylquinolinyl)hydrazone (AMH) of general composition [CuLX2] (whereL=AMH;X=Cl, Br, I, OAc or NO3) with the exception of sulphato complex, where the composition is found to be [CuLSO4]2 have been synthesized and characterized by elemental analyses, magnetic moment measurements, conductivity measurements, IR, electronic and EPR spectral techniques and by thermal analysis. A planar geometry is indicated for all the complexes. TG curves show one step decomposition of complexes and formation of CU2O at the end of the step.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01975076
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  • 3
    Electronic Resource
    Electronic Resource
    Peroxide levels in aging Zaprionus paravittiger on propyl gallate feeding (1992)
    Springer
    Age 15 (1992), S. 45-46 
    Details
    ISSN: 1574-4647
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Effect of optimal concentration of propyl gallate (25 μg/ml) on inorganic and lipid peroxides was studied in banana fruitfly, Zaprionus paravittiger. Both the peroxides significantly increased with age and decreased on antioxidant feeding to insects. The reduction was more pronounced in females and in young stages as compared to males and in old age. The results are indicative of the protective role of propyl gallate against free radicals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02435022
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  • 4
    Electronic Resource
    Electronic Resource
    Effect of propyl gallate feeding on antioxygenic and respiratory enzymes in liver of mice (1993)
    Springer
    Age 16 (1993), S. 93-95 
    Details
    ISSN: 1574-4647
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Antioxygenic enzymes provide defense to the cell against free radicals produced during respiration. This study deals with the effect of propyl gallate feeding on antioxygenic and respiratory enzymes in liver of male mice of different age groups. Antioxidant increased the activities of catalase, glutathione reductase, ATPase and NADH-dehydrogenase significantly in 8-month-old mice, whereas the increase in activity in early and late growth stages was observed only at selective concentrations. The increased activities of antioxygenic enzymes on propyl gallate feeding may be attributed to an increase in the activities of respiratory enzymes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02436140
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  • 5
    Electronic Resource
    Electronic Resource
    Effect of ascorbic acid on longevity, catalase and lipid peroxidation in Callosobruchus maculatus F. (1993)
    Springer
    Age 16 (1993), S. 87-92 
    Details
    ISSN: 1574-4647
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The natural defense against peroxidative damages inflicted by oxygen derived free radicals is provided by antioxygenic enzymes. Feeding of exogenous antioxidants increases the life span of insects by decreasing age-independent susceptibility to death. The present study describes the effect of L-ascorbic acid on the life span, catalase activity, and lipid peroxidation in Callosobruchus maculatus, a non-feeding insect. Life span studies were carried out on insects emerging from unsoaked, water soaked and ascorbic acid (0.1, 0.5, 1.0, 50, 100 and 250 mM) soaked seeds. The increased life span at 1 mM ascorbic acid concentration was accompanied by declined mortality rate, age-independent susceptibility to death, lipid peroxidation and increased catalase activity in both sexes of the insect. The differential distribution of catalase activity with respect to age and sex in whole body homogenates was observed in the insects. The increased longevity of C. maculatus on ascorbic acid treatment could be attributed to a decline in lipid peroxidation and increase in catalase activity of the insects.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02436139
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  • 6
    Electronic Resource
    Electronic Resource
    Production of 2,3-butanediol from wood hydrolysate byKlebsiella pneumoniae (1990)
    Springer
    World journal of microbiology and biotechnology 6 (1990), S. 328-332 
    Details
    ISSN: 1573-0972
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Description / Table of Contents: Résumé On a produit 12 g/l de 2,3-butanediol (27% de rendement en poids) à partir des sucres réducteurs dans un hydrolysat de bois au moyen deKlebsiella pneumoniae NRRL B-199. L'éthanol était présent à raison de 4 g/l et l'acétoïne de 0.4 g/l. Les conditions optimum pour une fermentation de 48 h étainent les suivantes: pH 6.0, 30°C, et 50 g de sucres réducteurs par litre. L'ajout de 1% (p/v) d'extrait de malt au millieu accroît la production de butanediol jusqu'à 13.3 g/l (29% de rendement) sans changer la production d'éthanol.
    Notes: Abstract 2,3-Butanediol was produced at 12g/l (27% w/w yield) from the reducing sugars in wood hydrolysate byKlebsiella pneumoniae NRRL B-199. Ethanol was present at 4 g/l and acetoin at 0.4 g/l. Optimum conditions for a 48 h fermentation were pH 6.0, 30°C and 50 g reducing sugars/l. Adding 1% (w/v) malt extract to the medium-enhanced butanedlol production to 13.3 g/l (yield 29%) without changing ethanol production.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01201306
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  • 7
    Electronic Resource
    Electronic Resource
    Genetics of antagonistic action and drug resistance inLactobacillus acidophilus (1992)
    Springer
    World journal of microbiology and biotechnology 8 (1992), S. 92-97 
    Details
    ISSN: 1573-0972
    Keywords: Bacteriocin ; conjugation ; electroporation ; Lactobacillus acidophilus ; protoplast fusion ; plasmids ; transduction ; transformation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract Lactobacillus acidophilus has been recommended as a dietary adjunct because of its antagonistic action toward intestinal pathogens and anti-carcinogenic and hypocholesterolemic activities. ManyL. acidophilus strains harbour plasmids and such strains generally produce bacteriocin(s). Resistance to antibiotics has also been shown to be linked with plasmids. Gene transfer and cloning systems are being developed forL. acidophilus which should permit the rapid genetic characterization of desired species and their modification to obtain predetermined traits. Drug resistance determinants and production of antibiotic-like substances may serve as suitable markers for the study and development of these genetic systems. Recent developments in gene transfer systems have been reviewed here.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01195823
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  • 8
    Electronic Resource
    Electronic Resource
    Immobilization of milk-clotting proteases (1993)
    Springer
    World journal of microbiology and biotechnology 9 (1993), S. 139-144 
    Details
    ISSN: 1573-0972
    Keywords: Cheese ; immobilization ; milk-clotting enzymes ; proteases ; rennet
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract Traditionally, cheese manufacturing is a batch process and current practice is to use a milk-clotting enzyme in a soluble form. Immobilization of proteases for milk coagulation has received renewed interest and potential applications have recently been reported. Use of immobilized proteases would permit renneting of milk as a continuous process. In addition, it should be possible to recover and re-use the enzyme for coagulation of further batches of milk. This review elaborates on the recent developments in the area of immobilized proteases and their application in cheese-making.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00327823
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  • 9
    Electronic Resource
    Electronic Resource
    NMR studies of molecular motion in tetramethylammonium hydroxide pentahydrate (1990)
    Springer
    Journal of inclusion phenomena and macrocyclic chemistry 8 (1990), S. 159-175 
    Details
    ISSN: 1573-1111
    Keywords: 1H NMR lineshape ; 2H NMR lineshape ; second moment ; spin-lattice relaxation time ; tetramethylammonium ; phase transition ; hydrogen bonding
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Polycrystalline (CH3)4NOH·5 H2O (I) and (CH3)4NOD·5D2O (II) have been studied by1H NMR lineshapes, second moments and spin-lattice relaxation times and by2H NMR lineshapes as a function of temperature. From low temperatures the first motion to occur is reorientation of the internally rigid (CH3)4N+ ion about a uniqueC 3 ′ axis (E ta = 8.37 kJ/mol forI,E a = 9.00 kJ/mole forII), followed closely by pseudo isotropic reorientation of the whole ion (E a = 18.10 kJ/mol). Motion of the cage molecules (water and hydroxide ion) occurs at higher temperatures with an apparentE a = 11.30 kJ/mol. There is some evidence of a phase transition inII but notI in the 220–230 K region.2H NMR lineshapes ofII below 220 K indicate static cage molecules. Some of the2H quadrupole coupling constants derived from these spectra correspond to O·O hydrogen-bond distances which are incompatible with the known room temperature structure ofI. Above the possible transition inII the anisotropic2H lineshapes indicate rapid motion of2H among all possible hydrogen-bond sites via transfer along the bonds and molecular reorientation. This motion persists in the high temperature phase but the lineshape becomes isotropic due to the cubic symmetry of this phase. It is possible that1H or2H tunnelling plays an important part in the motion of the cage molecules and the different phase behaviour ofI andII.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01131294
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  • 10
    Electronic Resource
    Electronic Resource
    On the uniqueness of best approximation in non-archimedian spaces (1991)
    Springer
    Periodica mathematica Hungarica 22 (1991), S. 121-124 
    Details
    ISSN: 1588-2829
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02327867
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