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  • 1
    Electronic Resource
    Electronic Resource
    Low temperature magnetic properties of potassium doped pentacene (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 82 (1997), S. 5670-5673 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Static susceptibility of the new molecular compound potassium doped pentacene was measured for the first time together with electron spin resonance (ESR) spectra in the dilution temperature region 4.2–0.02 K. Interesting thermal hysteresis and magnetic field dependence were observed in both the ESR spectra and static susceptibility indicating that an unusual kind of magnetic transition is taking place in this system. The present result is consistent with the previous observation of an antiferromagnetic-like transition in ESR data around 0.2 K. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.366429
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  • 2
    Electronic Resource
    Electronic Resource
    Engineering analysis of continuous production of L-aspartic acid by immobilized Escherichia coli cells in fixed bedsPresented at the 12th Symposium of the Society of Chemical Engineers of Japan, Hamamatsu, Japan, November 11, 1974 (1975)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 17 (1975), S. 1797-1804 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The reaction mechanism and decay behavior of aspartase activity for immobilized Escherichia coli cells were investigated by using a sectional packed column.Reaction within the immobilized cell column proceeded at zero-order on substrate solutions ranging in concentration from 0.1 to 1.0M, and the initial reaction rate was found to be 1.556 × 10-2 mol/min/liter of immobilized cells.The effect of temperature on the reaction rate constant was investigated. The Arrhenius plot was straight line at temperatures below 43°C, and the activation energy for immobilized cells was calculated to be 12.36 kcal/mol.Asparatase activity in the immobilized cell column decayed exponentially and uniformly in all sections of a column. Its half-life was approximately 120 days.The rate of formation of L-aspartic acid was shown to be independent of column dimensions.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260171209
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  • 3
    Electronic Resource
    Electronic Resource
    Immobilization of aminoacylase by adsorption to tannin immobilized on aminohexyl cellulosePresented at the Annual meeting of the Agricultural Chemical Society of Japan, Yokohama, Japan, April 2, 1977. (1979)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 21 (1979), S. 477-486 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The immobilization of aminoacylase (N-acylamino acid amidohydrolase, EC 3.5.1.14) was investigated by using tannin immobilized on aminohexyl cellulose. The most active immobilized aminoacylase was obtained when aminoacylase was adsorbed to the immobilized tannin in a weak alkaline medium containing sodium chloride and n-butanol at 37°C. The activity of the immobilized tannin-aminoacylase complex per unit volume was five times higher than that of the DEAE-Sephadex-aminoacylase complex used for industrial production of L-amino acids in our plants. The half-life of the immobilized tannin-aminoacylase complex was 20 days under continuous operation at a high concentration of substrate; on the contrary, that of the DEAE-Sephadex-aminoacylase complex was 0.5 days.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260210309
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  • 4
    Electronic Resource
    Electronic Resource
    Immobilization of enzymes and microbial cells using carrageenan as matrix (1979)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 21 (1979), S. 1697-1709 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Conditions for the gelation of k -carrageenan, which is a new polymer for immobilization of enzymes and microbial cells, were investigated in detail. k -Carrageenan was easily induced to gel by contact with metal ions, amines, amino acid derivatives, and water-miscible organic solvents. By using this property of k -carrageenan, the immobilization of enzymes and microbial cells was investigated. Several kinds of enzymes and microbial cells were easily immobilized with high enzyme activities. Immobilized preparations were easily tailor-made to various shapes such as cube, bead, and membrane. The obtained immobilized preparations were stable, and columns packed with them were used for continuous enzyme reaction for a long period. Their operational stabilities were enhanced by hardening with glutaraldehyde and hexamethylenediamine.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260211002
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  • 5
    Electronic Resource
    Electronic Resource
    Continuous production of L-aspartic acid by immobilized aspartaseStudies on immobilized enzymes, XI. Presented at the Annual Meeting of the Society of Fermentation Technology, Osaka, Japan, November 17, 1971. (1973)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 15 (1973), S. 69-84 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Various methods were tried for the immobilization of aspartase, and the preparation having the highest activity was obtained when partially purified aspartase from Escherichia coli was entrapped into polyacrylamide gel Iattice. Enzymatic properties of the immobilized aspartase were investigated and compared with those of the native aspartase. With regard to optimum pH, temperature, concentration of Mn++, kinetic constants and heat stability, no marked difference was observed between the native and immobilized aspartases.By employing an enzyme column packed with the immobilized aspartase, conditions for continuous production of L-aspartic acid from ammonium fumarate were investigated. When a solution of 1M ammonium fumarate (pH 8.5, containing 1mM MnCl2) was passed through the aspartase column at the flow rate of SV = 0.08 at 37°C, the highest rate of reaction was attained. From the column effluents, L-aspartic acid was obtained in a good yield.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260150106
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  • 6
    Electronic Resource
    Electronic Resource
    Evidence for gonadotropin-releasing hormone receptor mRNA expression by estrogen in rat granulosa cells (1999)
    Springer
    Cell & tissue research 297 (1999), S. 459-465 
    Details
    ISSN: 1432-0878
    Keywords: Key words GnRH receptor ; Gene expression ; In situ hybridization ; Ovary ; Hormonal regulation ; Follicular atresia ; Rat (Sprague Dawley)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract  The hormonal regulation of ovarian gonadotropin-releasing hormone (GnRH) receptor mRNA expression has been examined by in situ hybridization in hypophysectomized immature rats. In hypophysectomized rats, GnRH receptor mRNA expression is localized in the interstitial cells. After diethylstilbestrol treatment, most follicles grow to form early antral follicles and express GnRH receptor mRNA in the peripheral part of the granulosa layer, indicating that the expression in the growing follicles is estrogen-dependent. Only weak or no expression of the receptor mRNA is detectable in the atretic follicles of hypophysectomized rats, whereas very strong expression has been observed in the granulosa cells of atretic follicles of intact immature rats. Administration of testosterone or a GnRH agonist, both of which are atretic agents for ovarian follicles, to hypophysectomized rats markedly increases the apoptotic cell death of the granulosa cells but fails to induce GnRH receptor mRNA expression. The co-administration of these agents with diethylstilbestrol causes the granulosa cells of atretic follicles to express the receptor mRNA very strongly, suggesting that this mRNA expression in the atretic follicles is also estrogen-dependent. On the other hand, expression of the receptor mRNA in the ovarian interstitial cells is not affected by hypophysectomy or hormone treatments. All of these results clearly indicate that estrogen is essential for the expression of ovarian GnRH receptor mRNA in the granulosa cells of atretic follicles and growing follicles, whereas the expression in the interstitial cells is estrogen-independent.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004410051372
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  • 7
    Electronic Resource
    Electronic Resource
    Determination and quantitative analysis of alkaloids in Aconitum japonicum by liquid chromatography atmospheric pressure chemical ionization mass spectrometry (1994)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 23 (1994), S. 97-102 
    Details
    ISSN: 1052-9306
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A high-performance liquid chromatography/atmospheric pressure chemical ionization mass spectrometric method was useful for the simultaneous determination of aconitine-type alkaloids (jesaconitine, aconitine, mesaconitine, aljesaconitine A, aljesaconitine B, hokbusine A, deoxyjesaconitine, deoxyaconitine, hypaconitine, 14-anisoylaconine, 14-benzoylaconine, and 14-benzoylmesaconine) and other alkaloids (neoline, delcosine, 14-acetyldelcosine, kobusine, pseudokobusine, and lucidusculine found in Aconitum japonicum. These compounds were quite stable under the conditions used, and the protonated molecules or fragment ions characteristic of the molecule appeared as base peaks in the mass spectra and were used for selected ion monitoring. The method is linear over the range from 10 ng (50 ng; jesaconitine and neoline) to 10 μg of alkaloid per injection. The detection limits of aconitine-type alkaloids and neoline were ∼ 2-20 ng per injection.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bms.1200230209
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  • 8
    Electronic Resource
    Electronic Resource
    Studies on continuous enzyme reactions. IV. Preparation of a DEAE-sephadex-aminoacylase column and continuous optical resolution of acyl-DL-amino acidsPaper presented at a Meeting of the Kansai Division of the Agricultural Chemical Society of Japan, Kochi, Japan, November 13, 1965. (1967)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 9 (1967), S. 603-615 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Conditions for the preparation of an aminoacylase column using DEAE-Sephadex as a carrier were investigated. The aminoacylase column having the highest activity was obtained when 7500 μmoles/hr. of partially purified aminoacylase was charged into a column packed with 9 ml. of DEAE-Sephadex A-25 (bead type, hydroxy form). By employing a DEAE-Sephadex-aminoacylase column, conditions for continuous optical resolution of acyl-DL-amino acids were investigated. When a solution of 0.2M acetyl-DL-methionine (pH 7.0, containing 5 × 10-4M Co2+) or 0.2M acetyl-DL-phenylalanine (pH 6.0, containing 5 × 10-4M Co2+) was passed through the aminoacylase column at the flow rate of SV = 2.5 or 2.0, respectively, at 50°C., the highest rate of hydrolysis of both substrates was attained. From the column effluents, enzymatically hydrolyzed L-methionine and L-phenylalanine were isolated in a good yield.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260090413
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  • 9
    Electronic Resource
    Electronic Resource
    Preparation and characteristics of microcapsules containing asparaginasePresented at the Annual Meeting of the Japanese Biochemical Society, Sendai, Japan, October 7, 1971 (1972)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 14 (1972), S. 663-673 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Conditions for the preparation of microcapsules containing asparaginase by interfacial polymerization were investigated.The activity of microcapsules prepared under the optimal conditions was about 37% compared with that of native asparaginase. Particle size of microcapsules could be controlled by determining the stirring rate and concentration of Span 85. The membranes of microcapsules were resistant to mechanical shock or attack of chymotrypsin, and no leakage of asparaginase from microcapsules was observed.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260140411
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  • 10
    Electronic Resource
    Electronic Resource
    Preparation and properties of soluble-insoluble immobilized proteases (1987)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 29 (1987), S. 747-752 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: In order to carry out an effective enzyme reaction, the preparation of soluble-insoluble immobilized enzyme was investigated. Proteases were selected as model enzymes, and their immobilization was carried out by using an enteric coating polymer as a carrier. Among the polymers tested, methacrylic acid-methylacrylate-methylmethacrylate copolymer (MPM-06) gave the most active soluble-insoluble immobilized papain. This immobilized papain showed insoluble from below pH 4.8 and soluble form above pH 5.8; it was also soluble in water-miscible organic solvent. It was reusable and more stable with heat and water-miscible organic solvents than native proteases. Furthermore, various proteases could be immobilized by using MPM-06 with high activity. Chymotrypsin immobilized by this method catalyzed the effective peptide synthesis in a heterogeneous reaction system containing water-miscible organic solvent.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260290612
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