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  • 1
    Electronic Resource
    Electronic Resource
    Laser Raman studies of the 5 S rRNA-protein L5 complex of rat liver ribosomes
    Amsterdam : Elsevier
    FEBS Letters 155 (1983), S. 285-290 
    Details
    ISSN: 0014-5793
    Keywords: 5 S rRNA ; RNA-protein complex ; Raman spectroscopy ; Rat liver ; Ribosomal protein L5
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0014-5793(82)80622-4
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  • 2
    Electronic Resource
    Electronic Resource
    Conformational properties of streptokinase-secondary structure and localization of aromatic amino acids
    Amsterdam : Elsevier
    International Journal of Biological Macromolecules 14 (1992), S. 9-18 
    Details
    ISSN: 0141-8130
    Keywords: Raman spectroscopy ; Streptokinase ; [abr] Gu.HCl ; [abr] N-(1-oxy-2,2,5,5-tetramethyl-4-pyrrolidinyl)-bromoacetamide ; [abr] N-Ac-l-Trp-OET ; [abr] N-Ac-l-Tyr-OET ; [abr] N-acetyl-l-tryptophan-ethylester ; [abr] N-acetyl-l-tyrosine-ethylester ; [abr] SL-BrAA ; [abr] guanidine hydrochloride ; circular dichroism ; e.p.r. spectroscopy ; i.r. spectroscopy ; protein structure
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/S0141-8130(05)80013-3
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  • 3
    Electronic Resource
    Electronic Resource
    Comparison of eubacterial and eukaryotic 5S RNA structures: a Raman spectroscopic study
    Amsterdam : Elsevier
    International Journal of Biological Macromolecules 9 (1987), S. 349-356 
    Details
    ISSN: 0141-8130
    Keywords: Raman spectroscopy ; Ribosomal 5S RNA ; conformation
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0141-8130(87)90008-0
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  • 4
    Electronic Resource
    Electronic Resource
    Studies on the Aroma of Piñuela Fruit Pulp (Bromelia plumieri): Free and Bound Volatile Composition and Characterization of Some Glucoconjugates as Aroma Precursors (1998)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 21 (1998), S. 577-581 
    Details
    ISSN: 0935-6304
    Keywords: Volatiles ; Bromeliaceae ; Bromelia plumieri ; glycosidically bound volatiles ; aroma precursors ; glucoconjugates ; 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
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  • 5
    Electronic Resource
    Electronic Resource
    A versatile approach to the reproducible synthesis of functionalized polysiloxane stationary phases (1992)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 15 (1992), S. 444-448 
    Details
    ISSN: 0935-6304
    Keywords: Block polysiloxanes ; Block condensation ; Chiral polysiloxanes ; Functionalized polysiloxanes ; Polycondensation ; Polysiloxane stationary phase ; Reactive polysiloxanes ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Exploitation of the full potential of selector-modified polysiloxanes as chromatographic stationary phases is limited because conventional methods of silicone synthesis involve strong acids or strong nucleophiles such as water or bases; under these conditions many potentially useful selectors decompose. The general approach to polysiloxane synthesis presented herein gives access to functionalized polysiloxanes under mild conditions. The functional groups incorporated can serve as chromatographic selectors or as electrophilic sites for secondary modification or cross-linking.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240150708
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  • 6
    Electronic Resource
    Electronic Resource
    Two-dimensional mid-IR and near-IR correlation spectra of ribonuclease A: Using overtones and combination modes to monitor changes in secondary structure (1998)
    New York, NY [u.a.] : Wiley-Blackwell
    Biospectroscopy 4 (1998), S. S19 
    Details
    ISSN: 1075-4261
    Keywords: near-IR ; protein folding ; denaturation ; ribonuclease A ; overtone and combination bands ; 2-dimensional correlation analysis ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Physics
    Notes: We introduce near-IR spectroscopy as an ancillary tool for monitoring structural changes of proteins in aqueous solution using ribonuclease A (RNase A) as a model protein. The thermal unfolding of RNase A results in clear spectral changes in the near-IR and the mid-IR regions. In the near-IR the most pronounced changes are observed in the spectral region between 4820 and 4940 cm-1. The strong N—H combination band found at 4867 cm-1 in the spectrum of native RNase A shifts to 4878 cm-1 upon thermal unfolding. Hydrogen-deuterium exchange experiments that validate the N—H character of this mode can also be used to estimate the number of unexchanged amide protons after exposure to D2O. The transition profiles and temperatures derived from the temperature dependence of the N—H combination mode were found to be practically identical with those derived from the temperature dependence of the C=O amide I band in the mid-IR region, demonstrating that the near-IR region can be used as a conformation-sensitive monitor for the thermally induced unfolding of proteins in H2O solution. A 2-dimensional correlation analysis was applied to the mid-IR and near-IR spectra of RNase A to establish correlations between IR bands in both regions. The correlation analysis demonstrates that the thermal unfolding of RNase A is not a completely cooperative process; rather it begins with some changes in β-sheet structure, followed by the loss of α-helical structures, and then ending with the unfolding of the remaining β-sheets. © 1998 John Wiley & Sons, Inc. Biospectroscopy 4: S19-S29, 1998
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    A comparative infrared spectroscopic study of human breast tumors and breast tumor cell xenografts (1995)
    New York, NY [u.a.] : Wiley-Blackwell
    Biospectroscopy 1 (1995), S. 37-45 
    Details
    ISSN: 1075-4261
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Physics
    Notes: Fourier transform infrared spectroscopy has been applied to the study of human breast tumors, human breast tumor cell lines and xenografted human tumor cells. The results presented indicate that substantial differences exist on a macroscopic level between human tumors, xenografted tumors and human tumor cell lines, which are related to the presence of a significant connective tissue matrix in the tumors. On a macroscopic level tumor cell xenografts appear, in spectroscopic terms, to be relatively homogeneous with a relatively weak signature characteristic of connective tissue. Differences on a microscopic level between adjacent small (30 μm2) areas of the same xenografted tumor could be detected, which were due to local variations in collagen content. In addition to variations in collagen content, variation in the deposition of microscopic fat droplets throughout both human and xenografted tumors could be detected. These results indicate the care with which infrared spectroscopic studies of tissues must be carried out to avoid incorrect interpretation of results due to an incomplete understanding of tissue pathology. © 1995 John Wiley & Sons, Inc.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bspy.350010106
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  • 8
    Electronic Resource
    Electronic Resource
    Beziehungen zwischen chemischer Verschiebung (19F und 13C) und Ladungsdichte: III (1975)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 7 (1975), S. 274-285 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The diamagnetic and paramagnetic terms of the chemical shift are expressed by semi-empirical CNDO/II charge densities and bond orders. To establish whether a linear functional relationship exists between the calculated terms and the chemical shifts of 19F and 13C atoms a number of relationships in the form of a linear regression have been examined, taking into consideration both s̰dia and s̰dia plus s̰para. It was found that the relationship δA = a + bqA + cQAB + dqAπQAB produces the smallest standard deviation.
    Notes: Der diamagnetische und paramagnetische Term der chemischen Verschiebung wird durch semiempirische CNDO/II Ladungsdichte-und Bindungsordnungswerte ausgedrückt. Es wird untersucht ob ein linear funktionaler Zusammenhang zwischen den berechneten Termen und der chemischen Verschiebung von 19F- und 13C-Atomen besteht. In Form einer linearen Regression werden eine Reihe unterschiedlicher Ansätze-unter Berücksichtigung von s̰dia sowie s̰dia + s̰para - untersucht. Es zeigt sich, daß die Beziehung δA = a + bqA + cQAB + dqAπQAB den kleinsten mittleren Fehler aufweist.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270070606
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  • 9
    Electronic Resource
    Electronic Resource
    Versuche zur Berechnung der chemischen Verschiebung von 1H, 13C und 19F Atomen in Aliphaten, Olefinen und Acetylenen (1977)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 9 (1977), S. 389-391 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: An attempt was made to predict the chemical shifts of 1H, 13C and 19F atoms based on SCF LCGO MO calculations. The expectation value 〈1/R〉 as a measure for the diamagnetism was calculated exactly, the paramagnetism approximated by 〈1/R3〉 and values of the charge density bond order matrix. The influence of the neighbouring atoms was calculated point by point by the electron-density p(r) estimated by a spherical screening function. The terms permit one to calculate the 1H and 13C chemical shifts in fluoroacetylene, fluoroethylene and fluoroethane by a linear relationship with a standard deviation of 0.39 ppm for 1H and 1.6 ppm for 13C. The 19F chemical shifts were calculated directly by assuming σdia: σpara = 1:10.
    Notes: Die Vorhersage der chemischen Verschiebung für 1H, 13C und 19F Atome wird auf der Basis von SCF-LCGO-MO-rechnungen versucht. Der 〈1/R〉 Erwartungswert als Maß für den Diamagnetismus wird exakt berechnet, der Paramagnetismus durch 〈1/R3〉 sowie Werte der Ladungsbindungsordnung angenähert. Der Einfluß der Nachbaratome wird über die Elektronendichte p(r) auf einem kugelförmigen Raster ermittelt. Die Terme ermöglichen in Form eines linear funktionalen Ansatzes die Berechnung von 1H und 13C Verschiebungen an Fluoracetylen, Fluoräthylen und Fluoräthan wobei die Regressionsrechnung für 1H einen Standardfehler von 0,39 ppm und für 13C einen Standardfehler von 1,6 ppm ergibt. Die 19F Verschiebungen werden direkt durch Festlegung des σdia:σpara Verhältnisses berechnet.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270090703
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  • 10
    Electronic Resource
    Electronic Resource
    ESR and ENDOR study on the radical ions of two non - alternant hydrocarbons: 1,3,5,7-tetra-tert-butyl-s-indacene and 2,7-di-tert-butyldicyclopenta [a,e] cyclooctene (1995)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 33 (1995), S. S60 
    Details
    ISSN: 0749-1581
    Keywords: ESR ; ENDOR ; radical anions ; radical cations ; s-indacene ; dicyclopenta[a,e]cyclooctene ; s-indaceno[1,2,3-cd:5,6,7-c′d′]diphenalene ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The radical anions and radical cations of two alkyl-substituted non-alternant hydrocarbons, 1,3,5,7-tetra-tert-butyl-s-indacene and 2,7-di-tert-butyldicyclopenta [a,e] cyclooctene, were characterized by their proton coupling constants with the use of ESR and, in part, ENDOR spectroscopy. Considering the unusual electronic structures of the π-systems in question, these values agree fairly well with those predicted by simple MO theory. Also reported are the proton hyperfine data for the radical ions of the likewise alkyl-substituted non-alternant 8,16-diisopropyl-s-indaceno [1,2,3-cd:5,6,7-c′ d′] diphenalene.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1260331311
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