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  • 1
    Electronic Resource
    Electronic Resource
    Darstellung und Struktur von tert-Butyl(tert-butylamino)-[tris(tert-butyloxy)silylthio]boran (1988)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 556 (1988), S. 92-96 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Formation and Structure of tert-Butyl(tert-butylamino) [tris(tert-butyloxy)silylthio]-boraneThe smooth addition of the SH bond of (tBuO)3SiSH to the BN bond of tBuB≡NtBu gives the title compound, which crystallizes in the triclinic system, space group P1, with an unexpectedly short BN bond, d(BN) = 137 pm, in a Z configuration.
    Notes: Die SH-Bindung von (tBuO)3SiSH addiert sich glatt an die BN-Bindung von tBuB≡NtBu unter Bildung der Titelverbindung. Diese kristallisiert triklin, Raumgruppe P1, mit einer unerwartet kurzen, Z-konfigurierten BN-Bindung, d(BN) = 137 pm.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19885560109
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  • 2
    Electronic Resource
    Electronic Resource
    Interaction between kinesin, microtubules, and microtubule-associated protein 2 (1989)
    New York, NY : Wiley-Blackwell
    Cell Motility and the Cytoskeleton 14 (1989), S. 562-571 
    Details
    ISSN: 0886-1544
    Keywords: cell motility ; video-enhanced microscopy ; ATPase ; sodium fluoride ; motor proteins ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Kinesin from porcine brain was prepared by a procedure based on the strong binding of the protein to microtubules in the presence of sodium fluoride and ATP. The protocol reduces the requirement for taxol and AMP-PNP. The kinesin is active in terms of its ability to move microtubules on glass slides and its ATPase. The ATPase of this kinesin is about 8 nmol/min/mg; it is activated to 19 nmol/min/mg in the presence of microtubules. The relationship between gliding velocity and ATP concentration follows Michaelis-Menten kinetics. Using the motility assay, the maximal velocity is 0.78 μm/sec, and the Km values is 150 μM for ATP. For GTP the corresponding values are 0.38 μm/sec and 1.7 mM. ADP is a competitive inhibitor (Ki = 0.29 mM).Crude preparations of kinesin do not support motility on glass slides, whereas gel-filtered kinesin does. A search for potential inhibitory factors showed that one of them is MAP2; however, its inhibitory effect becomes visible only in certain conditions. MAP2 bound to microtubules does not inhibit kinesin-induced motility. However, when MAP2 and kinesin are preadsorbed to the glass surface independently of microtubules, MAP2 prevents the interaction of kinesin with microtubules, as if it formed a “lawn” that acted as a spacer and thus repelled the MAP-free microtubules or crosslinked the MAP-containing ones. The repelling effect of MAP2 domains (projection or assembly fragments obtained by chymotryptic cleavage) added separately is less pronounced and be overcome by kinesin. These results reinforce the view of MAP2 as a spacer molecule.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cm.970140413
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  • 3
    Electronic Resource
    Electronic Resource
    Separation of enantiomers on crosslinked acetylcellulose (1985)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 8 (1985), S. 37-38 
    Details
    ISSN: 0935-6304
    Keywords: Liquid chromatography, HPLC ; Racemate separation ; Crosslinked acetylcellulose as chiral matrix ; Polarimetry ; UV-detection ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240080111
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  • 4
    Electronic Resource
    Electronic Resource
    Cyclodextrins as chiral stationary phases in capillary gas chromatography. Part II: Heptakis(3-O-acetyl-2,6-di-O-pentyl)-ß-cyclodextrin (1988)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 11 (1988), S. 506-509 
    Details
    ISSN: 0935-6304
    Keywords: Enantioselective gas chromatography ; Cyclodextrin ; Chiral pharmaceuticals ; Amines ; β-Amino acids ; Cycloalkane-trans-diols ; Inclusion phenomena ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Heptakis (3-O-acetyl-2,6-di-O-pentyl)-ß-cyclodextrin is used as a chiral stationary phase in capillary gas chromatography. High enantioselectivity towards trifluoro-acetylated α and β-chiral amines, amino alcohols, α- and β-amino acid esters, and cyclic trans-diols is observed. In contrast to chiral polysiloxane phases, where hydrogen bonding interaction is essential for enantiomer separation, in cyclodextrins inclusion properties contribute to enantioselectivity. This can be concluded from the separation of N-alkylated amino compounds. The new chiral stationary phase exhibits a wide operating temperature range and is stable above 200°C.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240110702
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  • 5
    Electronic Resource
    Electronic Resource
    Cyclodextrins as chiral stationary phases in capillary gas chromatography. Part III: Hexakis(3-O-acetyl-2,6-di-O-pentyl)-α-cyclodextrinPart II: see ref. [4]. (1988)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 11 (1988), S. 621-625 
    Details
    ISSN: 0935-6304
    Keywords: Enantioselective gas chromatography ; α-Cyclodextrin ; Lactones ; O-Alkylglycerols ; Chiral pharmaceuticals ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The properties of hexakis(3-O-acetyl-2,6-di-O-pentyl)-α-cyclodextrin as a chiral stationary phase for capillary gas chromatography are described. For the first time the enantiomers of a series of different lactones are separated and their order of elution is assigned. Moreover, the enantiomers of trifluoroacetylated aldols and amino alcohols, the cyclic carbonates of 1,2-diols, 1,3-diols, O-alkylated glycerols, and some chiral pharmaceuticals are also separated on the new chiral phase. The modified α-cyclodextrin is stable above 200°C.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240110903
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  • 6
    Electronic Resource
    Electronic Resource
    Gas chromatographic/mass spectrometric assays for oxcarbazepine and its main metabolites, 10-hydroxy-carbazepine and carbazepine-10,11-trans-diol (1986)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 13 (1986), S. 651-656 
    Details
    ISSN: 1052-9306
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Oxcarbazepine (OCB) cannot be measured undecomposed by gas chromatography, not even when injected into a cooled, inert fused-silica capillary column. The bis-trimethylsilyl derivatives of the enol of OCB and of its main metabolite, 10-hydroxy-carbazepine (10-OH-CB), and the tris-trimethylsilyl derivative of carbazepine-10,11-trans-diol (CB-trans-diol) can be obtained easily at room temperature and are well suited for gas chromatographic and gas chromatographic/mass spectrometric analysis. Thermal decomposition to the substituted iminostilbene derivatives occurs only to the extent of a few per cent under the conditions described. Two gas chromatographic/mass spectrometric assays have been developed: one for the simultaneous quantification of OCB and 10-OH-CB, the other for CB-trans-diol. Both assays use carbazepine-10,11-cis-diol as the internal standard. Using 0.5 ml of plasma, limits of detection of 0.1, 0.1 and 1 ng/ml were obtained for OCB, 10-OH-CB and CB-trans-diol, respectively. CB-trans-diol is also the main metabolite of carbamazepine in patients under maintenance therapy. The kinetics of 15N-labelled CB-trans-diol derived from a single dose of (15N)carbamazepine has been measured in plasma and urine of patients and volunteers receiving (15N)carbamazepine in several studies.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bms.1200131203
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  • 7
    Electronic Resource
    Electronic Resource
    Carbon-13 in natural cholesterol (1986)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 13 (1986), S. 21-24 
    Details
    ISSN: 1052-9306
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: In order to assess the feasibility of using stable 13C as a tracer for studying cholesterol metabolism in vivo (i) the 13C content of some commonly consumed foods and (ii) the stability of the 13C content of human serum cholesterol has been investigated. A procedure is described for the extraction and purification of cholesterol from food, tissues and serum suitable for 13C analysis by mass spectrometry. The method caused no significant isotope fractionation effects. Generally, there was very little difference between the carbon isotope composition of the diet, the cholesterol and the tissue from which it was derived. However, the difference in 13C composition between tissue and cholesterol of prawns from differnt parts of the world was considerable, indicating a possible peculiarity in the metabolism of cholesterol by this species. The 13C content of human serum cholesterol on a normal diet did not alter significaantly with time, suggesting that stable isotope tracer techniques could be used to measure certain aspects of cholesterol metabolism in vivo.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bms.1200130105
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  • 8
    Electronic Resource
    Electronic Resource
    The application of a novel heat flux calorimeter for studying growth of Escherichia coli W in aerobic batch culture (1986)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 28 (1986), S. 1780-1793 
    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 modification and principle of a novel heat flux calorimeter for the in situ, on-line measurement of the heat generated during microbial growth is described. Data concerning the physical characterization of the calorimeter as a fermentor, including stability and sensitivity of the heat signal, are presented. The calorimeter has been successfully applied to the study of the aerobic batch culture of Escherichia coli W on glucose under carbon and nitrogen limitation. A direct correlation between growth and heat evolution was obtained. Quantitative analysis of the data suggests that the new calorimetric technique could be used for monitoring growth and specific metabolic events, for convenient medium optimization, and as a basis for a novel fermentation process control system.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260281205
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  • 9
    Electronic Resource
    Electronic Resource
    Measurement of interfacial areas in aerobic fermentations by ultrasonic pulse transmission (1986)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 28 (1986), S. 1302-1309 
    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 penetration of ultrasonic waves through opaque media and the large difference in the acoustic properties between air bubbles and the fermentation broth were used to measure the energy attenuation of pulsed ultrasound by the bubbles as the waves passed through the broth. This leads to an on-line determination of the specific interfacial area provided information is available about the holdup or bubble mean diameter. This article gives the principle of the method and demonstrates how the measured interfacial area may be used in evaluating the mass transfer coefficient of a fermentation system in a bubble column.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260280904
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  • 10
    Electronic Resource
    Electronic Resource
    Calorimetric investigation of aerobic fermentations (1987)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 30 (1987), S. 650-660 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A modified bench scale calorimeter has been employed to determine the heat generated by various microbial strains growing on a range of different substrates, covering degrees of reduction from 3 to 6.13. The results are analyzed, and interpreted in the light of coupled enthalpy and elemental balances. The heat released by the microbial cultures has been found to correlate linearly with other process variables, such as biomass generation and oxygen uptake. The ratio between the heat generated and the biomass formed, the so-called “heat yield” (YQ/x), has been shown both on theoretical and experimental grounds to increase with increasing degree of reduction of the substrate and to decrease with increasing biomass yield. The two effects could be combined into a simple model which permits the amount of heat released per unit of biomass formed to be predicted from the degree of reduction of the substrate as the only independent variable. The ratio between the heat generated and the oxygen taken up was constant at 440 kJ (mol O2)-1 throughout all experiments as expected from theoretical considerations for strongly aerobic processes.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260300509
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