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  • 1
    Electronic Resource
    Electronic Resource
    Interaction of poly-L-lysine with nucleic acids. V. Effect of salt concentration (1969)
    New York : Wiley-Blackwell
    Biopolymers 8 (1969), S. 153-155 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1969.360080112
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  • 2
    Electronic Resource
    Electronic Resource
    The vibrational spectra and structure of poly (rA-rU). Poly (rA-rU) (1973)
    New York : Wiley-Blackwell
    Biopolymers 12 (1973), S. 799-816 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Infrared and Raman spectra of aqueous poly(rA-rU)·poly(rA-rU), the double-helical complex containing strands of alternating riboadenylate and ribouridylate residues, display significant differences from one another and from corresponding spectra of poly(rA)·poly(rU), the double-helical complex of riboadenylate and ribouridylate homopolymers. Parallel studies on the copolymer and homopolymer complexes by cesium sulfate density gradient centrifugation, ultraviolet absorption spectroscopy, hydrogenion titration, 1-N oxidation of adenine residues by monoperphthalic acid and X-ray diffraction reveal, however, that the geometry of base pairing between adenine and uracil is closely similar in each complex and apparently of the Watson-Crick type. Therefore the differences observed between vibrational spectra of poly (rA-rU)·poly (rA-rU) and poly(rA)·poly(rU) are not due to different base-pairing schemes but may be attributed to differences in vibrational coupling between vertically stacked bases. Vibrational coupling may also account for the differences between infrared and Raman spectra of the same complex. Thus, the present results indicate that infrared and Raman frequencies of RNA in the region 1750-1550 cm-1 should be dependent on the base sequence.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1973.360120409
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  • 3
    Electronic Resource
    Electronic Resource
    Infrared spectra of transfer ribonucleic acids. III. Fragments of formyl-methionine tRNA from Escherichia Coli (1971)
    New York : Wiley-Blackwell
    Biopolymers 10 (1971), S. 681-698 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Four fragments (named K, L, M, and N) of Escherichia coli formylmethionine transfer RNA have been prepared by a partial digestion with ribonuclease T1 followed by a chromatographic separation with a DEAE-Sphadex (A-25) column and then a DEAE-cellulose column. The fragment K is the anticodon fragment with 19 nucleotides (previously reported). L is a fragment with 57 nucleotides involving the 3′-terminal (CCA). M is a fragment with 51 nucleotides which is equal to L except that M lacks 6 nucleotides at the 3′-terminal. N is a fragment with 20 nucleotides which involved the 5′-terminal and corresponds to the complementary half to L. The infrared absorption spectrum has been observed of each of these fragments and two equimolar mixtures L + N and M + N in D2O solutions at several temperatures. The results indicate that at 37°C, K has about 4 hydrogen-bonded base-pairs, L about 11, and M about 13. On the other hand, fragment N is found to have only three weak G-C pairs. For both L + N and M + N, 15-17 strong base pairs are found. The observations give direct support to the clover-leaf structure and at the same time provide information on the stability of each of the four arms in the structure.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.360100407
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  • 4
    Electronic Resource
    Electronic Resource
    Raman spectrum of a closed-circular DNA (1985)
    New York : Wiley-Blackwell
    Biopolymers 24 (1985), S. 1107-1111 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.360240614
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  • 5
    Electronic Resource
    Electronic Resource
    An A-form poly(dG) · poly(dC) in H2O solutionThis paper and an accompanying paper by G.J. Thomas, Jr. and J.M. Benevides [Biopolymers (1985) 24, 1101-1105] were both submitted for publication in Biopolymers. The respective authors learned of their similar findings on polynucleotide structures at the IXth International Conference on Raman Spectroscopy (Tokyo, August 26-31, 1984). (1985)
    New York : Wiley-Blackwell
    Biopolymers 24 (1985), S. 1841-1844 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    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/bip.360240913
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  • 6
    Electronic Resource
    Electronic Resource
    Infrared spectra and molecular conformations of D,L-copoly-γ-benzylglutamates (1963)
    New York : Wiley-Blackwell
    Biopolymers 1 (1963), S. 297-317 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Infrared absorption and x-ray diffraction measurements have been made of D,L-copoly-γ-benzylglutamate fibers (cast from dioxane solutions) with various D/L ratios and with various degrees of polymerization. It was found that each chain of these copolymers consists of a random coil portion and an α-helix portion and that the conformation of the latter is similar to the α-helix of pure poly-γ-benzyl-L-glutamate. It was also found that the fraction of the α-helix portion increases with the degree of polymerization of the copolymer. A simplified polymerization mechanism has been proposed for mixtures of D- and L-amino acid N-carboxyanhydrides. A model of the molecular conformation of the D,L-copolypeptide chains derived from this proposed polymerization mechanism is in good agreement with infrared, x-ray, and other measurements. Based on the results of these observations, we discuss the number of L- or D-residues linked in succession that is required for initiating the formation of an α-helix during the course of polymerization.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.360010403
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  • 7
    Electronic Resource
    Electronic Resource
    Infrared spectra of isotopic polyglycines (1966)
    New York : Wiley-Blackwell
    Biopolymers 4 (1966), S. 337-350 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: For infrared absorption measurements, the following five isotopic polyglycines have been prepared: ordinary polyglycine ( - NHCH2CO - )n, N-deuterated polyglycine ( - NDCH2CO - )n, C-deuterated polyglycine ( - NHCD2CO - )n, completely deuterated polyglycine ( - NDCD2CO - )n, and N15-substituted polyglycine ( - 15NHCH2CO - )n. Infrared spectra have been observed both in the I and II forms of each of these five isotopic polyglycines in the spectral region of 4000-300 cm.-1. On the basis of the comparison of these spectra with each other, a nearly complete set of assignments of the observed bands of polyglycines has been given.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1966.360040307
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  • 8
    Electronic Resource
    Electronic Resource
    Depolarization of Raman scattering from some nucleotides of RNA and DNA (1993)
    New York : Wiley-Blackwell
    Biopolymers 33 (1993), S. 1791-1802 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Depolarization ratios of Raman bands, excited at 488.0 nm, of guanosine-5′-monophosphoric 4 acid, cytidine-5′-monophosphoric acid, adenosine-5′-monophosphoric acid, thymidine-5′-monophosphoric acid, and uridine-5′-monophosphoric acid have been measured in their H2O and D2O solutions in the spectral region from 300 to 1800 cm-1. For comparison, the disodium salt of 2′-deoxyadenosine-5′-monophosphoric acid was also subjected to the depolarization measurement in its H2O solution. The results have been correlated with possible orientations of the principal axes of the Raman scattering tensors as well as with the relative magnitudes of the tensor components. Results should be useful for future polarized Raman studies of synthetic and natural DNA. © 1993 John Wiley & Sons, Inc.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.360331205
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  • 9
    Electronic Resource
    Electronic Resource
    Infrared spectrum of a DNA-RNA hybrid (1969)
    New York : Wiley-Blackwell
    Biopolymers 7 (1969), S. 909-916 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The infrared absorption spectrum in the 4000-400 cm- region of an oriented film of a DNA-RNA hybrid in its undeuterated and deuterated states was observed with the polarized radiation. Most of the stronger bands found in the double-helical DNA's and double-helical RNA's are identified in the spectrum of the hybrid. The absorption band at 1225 cm-1 shows a perpendicular dichroism and that at 1085 cm-1 shows almost no dichroism. These facts indicate that the orientation of the group with respect to the helix axis in the hybrid structure is not entirely the same as that in the double-helical Na DNA at, 75% RH., although the x-ray diffraction pattern of the hybrid is quite similar to that of the DNA A form. The PO2- orientation is not the same as that in the double-helical RNA either. The observed dichroism is explained, however, by considering that the PO2- group in the RNA moiety takes nearly the same orientation as that in the double-helical RNA, and the PO2- group in the DNA moiety takes nearly the same as that in the double-helical DNA.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1969.360070606
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  • 10
    Electronic Resource
    Electronic Resource
    Hydrogen-deuterium exchange of the tryptophan residues in bovine α-lactalbumin (1976)
    New York : Wiley-Blackwell
    Biopolymers 15 (1976), S. 1929-1938 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Effects of deuteration on the Raman spectrum of a tryptophan residue have been examined. The 1386 cm-1 line of deuterated tryptophan residue has been found to be useful for tracing the hydrogen-deuterium exchange reaction of this residue in a protein. An examination on bovine α-lactalbumin at pH 6.4 and at 20°C indicates that two of the four tryptophan residues exchange with a rate constant much greater than 9 × 10-4 sec-1, while the other two exchange with a rate constant of 4 × 10-5 sec-1. The latter two have been assigned to Trp 28 and Trp 108 of this protein. The kinetics of hydrogen-deuterium exchange reaction of completely “free” tryptophan residue have been examined by a proton magnetic resonance study on tryptophan itself. By taking the result of this examination into account, the chance of exposure to the solvent for Trp 28 or Trp 108 has been estimated to be 3 × 10-6 at pH 6.4 and at 20°C.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1976.360151005
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