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  • 1970-1974  (5,506)
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  • 1
    Electronic Resource
    Electronic Resource
    Ionic polysaccharides. IV. Free-rotation dimensions for disaccharide polymers. Comparison with experiment for hyaluronic acid (1970)
    New York : Wiley-Blackwell
    Biopolymers 9 (1970), S. 811-824 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The root-mean-square end-to-end distance has been calculated for a model allowing free rotation about glycoside bonds for the general case of polysaccharides having a disaccharide repeating unit. Numerical estimates are given for several naturally occurring structures based on an idealized pyranose unit in the C1 chair conformation. Extrapolation procedures which make use of the intrinsic viscosity [η] in good solvents to obtain unperturbed dimensions do not represent, data for hyaluronic acid very well, especially at low molecular weights. However, order-of-magnitude estimates suggest that this polymer behaves similarly to other polysaccharides, and probably has stiffer local structure than typical non-ionic synthetic polymers. A double logarithmic plot of the product of [η] and M̄w, the weight-average molecular weight, against the degree of polymerization in the range for M̄w of 104 to 2 × 104 permits a straight-line fit of available data for all the glycosaminoglycans, including heparin and the chondroitin sulfates, as well as sodium carboxymethyl cellulose. This result suggests similarity of short-chain hydrodynamic behavior of these polymers.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1970.360090707
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  • 2
    Electronic Resource
    Electronic Resource
    The 4th Jerusalem symposium (1970)
    New York : Wiley-Blackwell
    Biopolymers 9 (1970), S. 875-875 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1970.360090711
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  • 3
    Electronic Resource
    Electronic Resource
    Masthead (1970)
    New York : Wiley-Blackwell
    Biopolymers 9 (1970) 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1970.360090801
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  • 4
    Electronic Resource
    Electronic Resource
    Diffusional boundary spreading in the ultracentrifuge (1970)
    New York : Wiley-Blackwell
    Biopolymers 9 (1970), S. 865-874 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A common approximation for deriving solutions to the Lamm equation is to neglect diffusion. This paper presents a singular perturbation technique that allows one to estimate the band spreading due to nonzero diffusion coefficient. We illustrate the general mathematical technique by its application to sedimentation when pressure effects are important. Comparison of the approximate solution with accurate numerical solutions shows that the relative errors are of the order of 1% both for concentration and concentration gradient for parameters of chemical interest.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1970.360090710
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  • 5
    Electronic Resource
    Electronic Resource
    Role of pH in charging of glycogen (1970)
    New York : Wiley-Blackwell
    Biopolymers 9 (1970), S. 891-896 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Glycogen acquires a negative charge in both alkaline and acidic solutions and can move in an electrical field, its mobility being related to the degree of alkalinity or acidity. There is a slight increase in relative viscosity at both ends of the pH spectrum. These effects and the changes in nuclear magnetic resonance as a function of pH are interpreted.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1970.360090803
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  • 6
    Electronic Resource
    Electronic Resource
    Studies on the viscosity of solutions of bovine liver glutamate dehydrogenase and on related hydrodynamic models; effect of toluene on enzyme association (1970)
    New York : Wiley-Blackwell
    Biopolymers 9 (1970), S. 877-889 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The viscosity of bovine liver glutamate dehydrogenase solutions was studied at 10 and 20° C in 0.2.M sodium phosphate buffer at pH 7, in the concentration range 0.1-8 mg/ml. A method for the study of the viscosity of very dilute solutions of associating enzymes is described. It was found that the reduced specific viscosity ηsp/c of glutamate dehydrogenase continuously increases with increasing enzyme concentration, from about 4 ml/g at the lowest concentrations to about 16 ml/g at 8 mg/ml. In the presence of 10-3M GTP and 10-3M NADH the viscosity increase is much smaller and the results can be extrapolated to zero enzyme concentration to yield an intrinsic viscosity [η] = 3.2. The values of ηsp/c in phosphate buffer alone apparently extrapolate to the same value of [η], or to a value close to it. We also observe that, in the presence of toluene ηsp/c increases very much more with enzyme concentration: ηsp/c already equals 16 ml/g at a concentration of 0.75 mg/ml. These observations are in good agreement with the hypothesis that the active oligomer of glutamate dehydrogenase (MW = 312,000) associates with increasing enzyme concentration to form linear rodlike polymers of indefinite length. This association is strongly diminished by the addition of 10-3M GTP, 10-3M NADH. Toluene, on the other hand, promotes reversible association to linear polymers of very high molecular weight. The transverse and axial rotary frictional coefficients of macroscopic bodies, similar to a physical model for the structure of glutamate dehydrogenase recently advanced, were determined. Assuming that the viscosity of the model is equal to that of an ellipsoid of rotation with identical frictional coefficients, we calculate [η] = 3.26 ml/g according to Kuhn and 3.20 ml/g according to Simha, for the glutamate dehydrogenase oligomer, in good agreement with the result derived from the study of enzyme solutions.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1970.360090802
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  • 7
    Electronic Resource
    Electronic Resource
    Surface chemistry of poly(β-beiizyl L-aspartate) (1970)
    New York : Wiley-Blackwell
    Biopolymers 9 (1970), S. 911-922 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Molecular monolaycrs of poly(β-benzyl L-aspartate) spread at. an air-water interface have been studied. The results obtained both by direct observations on the monlayer and from examination of collapsed films with polarized infrared spectroscopy and electron diffraction are consistent with the presence of right handed α-helices in the mono-layer when the molecular weight is high. When 1% (v/v) isopropanol is present in the subphase the right-handed helix prevails, provided that the monolayer is first spread on water. Monolayers of low molecular weight polymer appear to form the crossed-β structure. Orientated collapsed films of high molecular weight polymer can be converted to the left-handed α-helical and to the ω-conformation, and the mechanisms are discussed. The surface chemistry of this polymer is compared with that of related polymers and a consistent pattern of behavior emerges.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1970.360090805
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  • 8
    Electronic Resource
    Electronic Resource
    Characterization of acid-denatured DNA by low-angle light scattering (1970)
    New York : Wiley-Blackwell
    Biopolymers 9 (1970), S. 1017-1028 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Low-angle light scattering results reported previously demonstrated that measurements on high molecular weight native DNA must be made at angles below 30° in order to obtain correct molecular weights. Earlier light-scattering data obtained on denaturated DNA at angles above 30° showed no change in molecular weight upon denaturation, even though other techniques clearly showed that strand separation occurred. This paper reports low-angle measurements on solutions of calf thymus and T7 DNA denatured under acidic conditions. The results demonstrate that a halving of molecular weight consistent with strand separation is detected by light scattering only when low-angle data are used to obtain correct molecular weights for native material. As expected from theoretical considerations, the scattering from denatured DNA is a linear function of sin2(θ/2), where θ is the angle of observation. This result shows that anticipated experimental artifacts have no significant effect on the low-angle measurements and demonstrates that the curvature in the scattering envelope observed for native DNA below 30° is an inherent property of the native molecule.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1970.360090905
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  • 9
    Electronic Resource
    Electronic Resource
    Kinetics for the transition between cis- and trans-helices in poly-L-prolineA preliminary report of this work was presented at the 156th National Meeting of the American Chemical Society, Atlantic City, New Jersey, September 1968. (1970)
    New York : Wiley-Blackwell
    Biopolymers 9 (1970), S. 1001-1016 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The kinetics for the cis-trans isomerization of long-chain poly-L-proline has been studied as a function of pressure, temperature, and solvent composition in the acetic acid + n-propanol solvent system. Our complete kinetic curves were fitted by Monte Carlo techniques, and rate constants for nucleation, growth, and termination were estimated. It was found that for the formation of a cis-helix, high pressure, low temperature, and increased acetic acid content of the solvent, lowered the rate of nucleation relative to growth. The inverse seems to be t rue for the formation of a trans-helix. Molecular models suggest that this behavior of the kinetic constants can be due to the exposure of peptide units to solvent in the transition state for trans nucleation, and the burying of peptide units in the transition state for cis nucleation. It is further suggested from our analysis of complete kinetic curves that at least one of the assumptions usually made in the analysis of relaxation kinetics is invalid for poly-L-proline.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1970.360090904
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  • 10
    Electronic Resource
    Electronic Resource
    X-Ray diffraction of ethylenediamine-amylose complex (1970)
    New York : Wiley-Blackwell
    Biopolymers 9 (1970), S. 1039-1047 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Solutions of amylose in ethylenediamine yield a crystalline film complex upon evaporation of solvent. The x-ray analysis indicates the presence of a tetragonal-shaped cell with a symmetry approximating that of space group P212121. The amylose sixfold helix has a diameter of 13.3 Å and a translation period of 8.0Å. Chemical and physical analyses support a complexing ratio of one ethylenediamine molecule to every two glucose units. The structure is nearly identical to any amylose-dimethyl sulfoxide complex previously examined. The square mode of packing arrangement appears to result from complexation between amylose chains. Such complexing indicates a much greater degree of amylose interaction than is observed in amylose complex structures having a hexagonal close-packing arrangement.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1970.360090907
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  • 11
    Electronic Resource
    Electronic Resource
    Potentiometric titration of poly-S-carboxymethyl-L-cysteine in aqueous NaCl solution (1970)
    New York : Wiley-Blackwell
    Biopolymers 9 (1970), S. 1049-1058 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: pH titration measurements of poly- S-carboxymethyl-L-cysteine were undertaken in the aqueous Nacl solution in relation to the β form-random coil transition. The titration curves show a marked molecular weight dependence because of the shortened chain length of materials. Comparison of the optical rotatory dispersion parameter a0 with the titration curve reveals that the titration curve apparently reflects a β structure-random coil transition. The β form of this polymer is assumed to be an intramolecular β form, rather than a β structure stabilized by an intermolecular hydrogen bond, at least in the polymer concentration range considered here. The standard free energy change per amino acid residue for the transition from un-ionized random coil to un-ionized β form is estimated to be about -750 cal/mole residue in the range of 0.005-0.2M NaCl concentration.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1970.360090908
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  • 12
    Electronic Resource
    Electronic Resource
    Oligonucleotide interactions. III. Circular dichroism studies of the conformation of deoxyoligonucleolides (1970)
    New York : Wiley-Blackwell
    Biopolymers 9 (1970), S. 1059-1077 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The circular dichroism (CD) spectra of the four usual deoxymononucleosides, all sixteen deoxydinucleotides, and a number of trinucleotides have been measured. The dimer spectra are quite different from the sum of the spectra of their constituent monomers. This indicates the presence of base-stacked conformations analogous to those found for ribonucleoside diphosphates. The CD spectra of several deoxytrinucleotide diphosphates and single-strand f 1 DNA can be calculated fairly well by using a semi-empirical nearest-neighbor approach. There is little or no effect of terminal phosphate or of salt concentration on the optical properties of most deoxy oligomers. The possibility of simultaneous analysis of mixtures of deoxypurine or deoxypyrimidine sequence isomers has been examined. This seems to be a viable approach for the analysis of purine runs but cannot promise much success for pyrimidine runs.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1970.360090909
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  • 13
    Electronic Resource
    Electronic Resource
    Oligonucleotide interactions. IV. Conformational differences between deoxy- and ribodinucleoside phosphates (1970)
    New York : Wiley-Blackwell
    Biopolymers 9 (1970), S. 1079-1103 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The circular dichroism spectra of all 16 ribodinudeoside phosphates containing the bases adenine, uracil, cytosine, and guanine have been measured at room temperature and neutral pH. These results are compared with the circular dichroism spectra of the corresponding deoxy compounds. From the optical properties it is clear that the geometry of the base-stacked conformation of ribo compounds must differ substantially from that of deoxy compounds. Because of this, it is not possible to draw firm conclusions about the relative extent of stacking in most ribo and deoxy compounds. The optical rotatory dispersion of about a dozen deoxy and ribodinucleoside phosphates has been studied as a function of temperature. These results confirmed the conclusions drawn earlier from measurements at a single temperature. Several dinucleoside phosphates containing a 2′ → 5′ phosphodiester bond have also been examined. These compounds have a substantial degree of base stacking at room temperature. The geometry of the stacked conformation is different from that of either the normal ribo dimer or the deoxy dimer. The role of the 2′-hydroxyl group in stabilizing base stacked geometries has been examined by studies on C-2′-O-methyl-pC. This compound has optical properties almost identical to those of CpC. This suggests that the effect of the 2′ hydroxyl is felt indirectly through its perturbation of the geometry of the sugar ring rather than directly by hydrogen bonding. It is not possible at present to identify precise conformational differences among deoxy-, ribo-and 2′ → 5′ ribodinucleoside phosphates.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1970.360090910
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  • 14
    Electronic Resource
    Electronic Resource
    Aggregation of poly-L-proline II (1970)
    New York : Wiley-Blackwell
    Biopolymers 9 (1970), S. 1119-1124 
    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.1970.360090912
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  • 15
    Electronic Resource
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    The influence of single-strand breaks on the kinetics of denaturation of DNA (1970)
    New York : Wiley-Blackwell
    Biopolymers 9 (1970), S. 1349-1360 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The influence of single-strand breaks on the kinetics of the relaxation of DNA in a solution of low ionic strength has been investigated by a temperature jump method. The relaxation of DNA after a jump of 0.7 °C in the melting region has been monitored by measuring the extinction at 260 nm. For essentially monodisperse T4 DNA (M = 130 × 106) two distinct relaxation times have been observed, that depend markedly on the initial extent of denaturation 1 - θ. The larger relaxation time decreases from 450 sec to about 300 sec, the smaller one from 55 see to 30 when 1 - θ increases from 0.03 to about 0.8. The dependence of these relaxation times on the average number of single-strand breaks per molecule (p) appears to be very small up to p = 100. However, the relative contribution of the slow process decreases sharply when p increases from 0.6 to 30 and remains nearly constant for larger p. The observations are discussed in the light recent theories of the kinetics of denaturation.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1970.360091105
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  • 16
    Electronic Resource
    Electronic Resource
    Electro-optic scattering studies on deoxyribonucleic acid (1970)
    New York : Wiley-Blackwell
    Biopolymers 9 (1970), S. 1361-1372 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Measurements have been made of the intensity of light scattered from aqueous solutions of calf thymus DNA with and without the application of electric fields. For fields approaching 150 V/cm and frequencies below 2.5 KHz, changes (ΔI) of up to 10% in the residual scattered intensity were observed. In agreement with previous dielectric and electric birefringence measurements, a low frequency dispersion of ΔI was observed, from which a rotary diffusion constant (D) of 1200 s-1 was determined. Interpreting the electric field data in terms of the classical dipolar orientation theory led to values of 2.4 × 10-25 cm (7.4 × 10-14 esu) and 4.3 × 10-25 cm (13 × 10-14 esu) for the permanent dipole moment and the anisotropy of the electric polarisabilities respectively. Furthermore the permanent dipole moment was along the major molecular axis and the particles orientated in the field as rigid entities. The zero field data indicated a molecular shape which was not rodlike but corresponded to the Kratky-Porod “stiffness” parameter of x = 24 for the wormlike coil model. Although curved, the molecules appeared to orientate in low-intensity electric fields as rigid, but not rodlike molecules. The implications of this on recent discrepancies in D determined by two or more dynamic relaxation methods is briefly discussed.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1970.360091106
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  • 17
    Electronic Resource
    Electronic Resource
    Buoyant density and solvation of magnesium DNA (1970)
    New York : Wiley-Blackwell
    Biopolymers 9 (1970), S. 1391-1402 
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    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The buoyant density of T-4 DNA was determined by equilibrium sedimentation in a density gradient, of mixed solutions of cesium and magnesium chlorides and bromides. The preferential hydration was calculated from these data, allowing appropriately for the exchange equilibrium of DNA with Cs+ and Mg++ ions. The charge and intrinsic solvation of the counterions were found to have no appreciable effect on the hydration of the DNA, the extent of solvation depending only on the thermodynamic, activity of the water. Various reasonable hypotheses are discussed to account for these results.
    Additional Material: 3 Ill.
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    URL: http://dx.doi.org/10.1002/bip.1970.360091108
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  • 18
    Electronic Resource
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    Studies on bacteriophage MS2. VIII. Evidence for dimer formation of MS2 RNA by reaction with formaldehyde at acidic pH (1970)
    New York : Wiley-Blackwell
    Biopolymers 9 (1970), S. 1373-1389 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Reaction of 27 SMS2 RNA with formaldehyde normally results in an unfolded, 13.4 S form. At acidic pH, however, and under the proper ionic conditions, a compact component sedimenting at 36-40 S was obtained. The molecular weight of this species corresponds to a dinner. The formaldehyde concentration was not critical, and approximately the same number of base pairs had been opened in the compact and in the unfolded form. Presumably dimers, which had been specifically formed under defined conditions, were stabilized by formaldehyde-induced crosslinks. Similar dimers were formed by 16 S and by 23 S ribosomal RNA, but not by tRNA.
    Additional Material: 7 Ill.
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    URL: http://dx.doi.org/10.1002/bip.1970.360091107
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  • 19
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    Antibiotica: Werkzeuge zur Erforschung der Nucleinsäure- und Protein-Synthese (1970)
    Weinheim : Wiley-Blackwell
    Chemie in unserer Zeit 4 (1970), S. 26-32 
    Details
    ISSN: 0009-2851
    Keywords: Chemistry ; Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ciuz.19700040105
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  • 20
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    Strahlenschutz geht alle an. Hundert heitere Bilder mit ernsten Texten von F. Wachsmann. Zeichnungen von A. Stude. Verlag Karl Thiemig KG, München 1969. 1. Aufl., 208 S., 100 Abb., kart. DM 9,80 (1970)
    Weinheim : Wiley-Blackwell
    Chemie in unserer Zeit 4 (1970), S. 34-34 
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    ISSN: 0009-2851
    Keywords: Chemistry ; Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ciuz.19700040110
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  • 21
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    Zusätze in Kraftstoffen (1970)
    Weinheim : Wiley-Blackwell
    Chemie in unserer Zeit 4 (1970), S. 44-50 
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    ISSN: 0009-2851
    Keywords: Chemistry ; Chemistry
    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/ciuz.19700040203
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  • 22
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    Geomikrobiologie - ein Grenzgebiet (1970)
    Weinheim : Wiley-Blackwell
    Chemie in unserer Zeit 4 (1970), S. 51-54 
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    ISSN: 0009-2851
    Keywords: Chemistry ; Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
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    URL: http://dx.doi.org/10.1002/ciuz.19700040204
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  • 23
    Electronic Resource
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    Solvatisierte Elektronen (1970)
    Weinheim : Wiley-Blackwell
    Chemie in unserer Zeit 4 (1970), S. 37-43 
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    ISSN: 0009-2851
    Keywords: Chemistry ; Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ciuz.19700040202
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  • 24
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    Chronik (1970)
    Weinheim : Wiley-Blackwell
    Chemie in unserer Zeit 4 (1970), S. 35-36 
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    ISSN: 0009-2851
    Keywords: Chemistry ; Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ciuz.19700040111
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  • 25
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    Chemilumineszenz (1970)
    Weinheim : Wiley-Blackwell
    Chemie in unserer Zeit 4 (1970), S. 55-60 
    Details
    ISSN: 0009-2851
    Keywords: Chemistry ; Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 5 Ill.
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    Das Experiment: Versuche mit Glucoseoxidase (1970)
    Weinheim : Wiley-Blackwell
    Chemie in unserer Zeit 4 (1970), S. 61-62 
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    ISSN: 0009-2851
    Keywords: Chemistry ; Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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    URL: http://dx.doi.org/10.1002/ciuz.19700040206
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    Einführung in die Chemie. Von H. R. Christen. Otto Salle-Verlag, Frankfurt/M.-Hamburg 1969. 4. Aufl., XII, 479 S., 273 Abb., Linson DM 19,60 (1970)
    Weinheim : Wiley-Blackwell
    Chemie in unserer Zeit 4 (1970), S. 63-63 
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    Keywords: Chemistry ; Chemistry
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    Die chemische Bindung. Von C. A. Coulson. Übers. und ergänzt von F. Wille. S. Hirzel Verlag, Stuttgart 1969. 1. Aufl., XII, 382 S., 133 Abb., 35 Tab., DM 32,- (1970)
    Weinheim : Wiley-Blackwell
    Chemie in unserer Zeit 4 (1970), S. 63-64 
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    Keywords: Chemistry ; Chemistry
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    Physikalische Chemie. Teil I: Einführung in die Gastheorie, Quantentheorie, Thermodynamik. Ein Lehrbuch für Chemiker, Verfahrenstechniker, Physiker ab 3. Semester. Von G. M. Barrow. (Aus der unitext-Reihe). Bohmann-Verlag, Heidelberg-Wien/Friedr. Vieweg Sohn, Braunschweig 1969. 1. Aufl., 257 S., 67 Abb., 35 Tab., Paperback DM 19,80 (1970)
    Weinheim : Wiley-Blackwell
    Chemie in unserer Zeit 4 (1970), S. 195-195 
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    Keywords: Chemistry ; Chemistry
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    Volume changes accompanying thermal denaturation of deoxyribonucleic acid. II. Denaturation at alkaline pH (1970)
    New York : Wiley-Blackwell
    Biopolymers 9 (1970), S. 445-457 
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    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
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    Notes: The change in apparent molal volume φ of DNA on thermal denaturation in carbonate buffer at pH 11.0 has been determined by the dilatometric method. It was found that φ increases sigmoidally during the helix-coil transition. Several methods, including a colorimetric technique that closely simulates the conditions used in the dilatometric experiments, were employed to estimate the protons lost by the DNA during the transition. These measurements indicated that the extent of the proton loss depends on the counterion present, increasing in the order Li+ 〈 Na+ 〈 K+ 〈 Cs+. The major part of the volume changes observed during the denaturation is due to the volume changes expected to accompany the transfer of protons from the bases guanine and thym ne to carbonate ions. As has been previously reported for the denaturation of DNA at neutral pH, the volume change directly due to the change in shape of the polymer molecules is so small as to be experimentally undetectable.
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    Location of proline derivatives in conformational space. II. Theoretical optical activity (1970)
    New York : Wiley-Blackwell
    Biopolymers 9 (1970), S. 569-588 
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    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
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    Notes: The coupling of theoretical optical calculations with experimental data provides a check of the validity of the theory or provides conformational information. The theory was validated by studies in which the approximate conformation was located independently. These studies have shown that a theory restricted to the two lowest energy transitions for each chromophore gives qualitative agreement with experiment. On the other hand, for some of the proline derivatives, the theoretical treatment allows detailed conformational assignments. Both successes and failures in correlating theory with experiment are discussed. The results presented provide a basis for assessing the prospects for relating protein and polypeptide optical activity to their conformations.
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    Ethidium bromide-DNA complex: Wavelength dependence of pyrimidine dimer inhibition and sensitized fluorescence as probes of excited states (1970)
    New York : Wiley-Blackwell
    Biopolymers 9 (1970), S. 639-653 
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    Keywords: Chemistry ; Polymer and Materials Science
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    Notes: Ethidium bromide inhibits the formation of ultraviolet-induced pyrimidine dimers in DNA. The efficiency of dimer inhibition increases with increasing energy of the exciting photons. The efficiency of energy transfer from the DNA singlet to the dye singlet, as monitored by sensitized fluorescence, is independent of wavelength. The efficiency of singlet-singlet transfer agrees with that for dimer inhibition at photon energies corresponding to excitation of the lowest singlet state of DNA. Our results support a model in which dimers are formed both directly from the singlet state and also from the triplet state, with triplets arising from higher vibrational levels of the singlet.
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    Testing of A size criterion for DNA-hydrocarbon binding (1970)
    New York : Wiley-Blackwell
    Biopolymers 9 (1970), S. 689-696 
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    Keywords: Chemistry ; Polymer and Materials Science
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    Notes: The intercalation model of DNA-hydrocarbon binding appears reasonable, but rests on indirect evidence only. To test the model, a size criterion for binding has been proposed. The size criterion is based on the assumption that hydrophobic forces play a major role in the binding of hydrocarbons to DNA. It states that hydrocarbons which are small enough to intercalate into DNA and be well protected from contact with the medium, will be found to bind to DNA; those that are too large will not. We report results on the binding of fourteen polycyclic aromatic hydrocarbons to DNA. Predictions based on the size criterion were found to be valid in all cases tested.
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    Cooperative binding of adenosine by polyuridylic acid: A further analysis (1970)
    New York : Wiley-Blackwell
    Biopolymers 9 (1970), S. 697-715 
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    Notes: The dialysis data of Huang and Ts'o for the cooperative binding of adensine to polyuridylic acid are analyzed here using a grand-partition function Ising model method similar to that originally employed for polyelectrolytes by Rice and Nagasawa. An appropriate modification permitting the treatment of the sliding degeneracy of the two polyuridylic acid strands is also included. In addition to the previously estimated stacking energy of about -6 kcal/mole one also obtains the free energy change F̄ for the transfer of a single adenosine molecule from a fixed site in solution to a fixed site on the polyuridylic acid. This binding energy falls in the range F̄ = -140 to +620 cal/mole, indicating that binding in the 1:2 (purine: pyrimidine) complex is either very weak or repulsive. The absence of any comparable cooperative stacking of adenosines in solution at the same concentration together with the likely repulsive character of the binding implies that the stacking energy must contain a significant contribution from other processes than simple stacking of adenosines. A generalization of the theory to treat multicomponent binding and longer-range interactions is effected, and the form applicable to simultaneous binding of both adenosine and guanosine by polyuridylic acid is presented.
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    PMR chemical shifts of TFA in poly(γ-benzyl L-glutamate) solutions (1970)
    New York : Wiley-Blackwell
    Biopolymers 9 (1970), S. 739-744 
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    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
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    Notes: The present communication describes a new way of studying helix-random coil transformations of polypeptide, poly-(γ-benzyl L-glutamate), in benzene-trifluoracetic acid (TFA) and chloroform-TFA systems. The difference between the PMR chemical shift of TFA with and without the polypeptide, measured as Δ, may be used to follow the conformational transition. This technique is particularly useful for concentrated solutions, where the PMR peaks of the polymer are so broad that no valuable information may be derived. As the TFA content increases in the system (at constant polymer concentration), Δ decreases normally whether the polymer is helical or random. However, Δ changes in a different way in the helix-random coil transition region, and actually increases with increasing TFA content. This peculiar behavior is explained in terms of the solvation of the helix and random coil structures.
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    NMR study of the slowly exchanging hydrogens of 640 Å steerskin collagen (1970)
    New York : Wiley-Blackwell
    Biopolymers 9 (1970), S. 745-748 
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    Keywords: Chemistry ; Polymer and Materials Science
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    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
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    Solution properties of synthetic polypeptides. VI. Helix-coil transition of poly-N5-(3-hydroxypropyl)-L-glutamine (1970)
    New York : Wiley-Blackwell
    Biopolymers 9 (1970), S. 717-738 
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    Keywords: Chemistry ; Polymer and Materials Science
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    Notes: A new procedure for evaluating u and σ characterizing σ-helix-forming polypeptides in solution was derived from Nagai's theory for the helix-coil transition of such polymers. Here u is the activity for helix formation from random coil, and σ is the helix initiation parameter. The necessary data are the helical content fN at fixed solvent and temperature as a function of N, where N is the degree of polymerization of the polypeptide sample. Such data were obtained from ORD measurements on a number of fractionated samples of poly-N5-(3-hydroxypropyl)-L-glutamine (PHPG) in mixtures of water and methanol covering the complete range of composition and at various termperatures (5-40°C). When analyzed in terms of the proposed procedure, they yielded values of σ which were in the range (3.2 ± 0.6) × 10-4, substantially independent of solvent composition and temperature. These values were much larger than those obtained recently for σ of poly(β-benzyl-L-aspartate) in m-cresol and in a mixture of chloroform and DCA. The data for [η] and s0 (limiting sedimentation coefficient) as functions of molecular weight indicated that the molecular shape of PHPG in pure methanol is essentially rodlike, whereas that in pure water is not entirely randomly coiled but rather may be regarded as an interrupted helix. These indications were consistent with the results from ORD measurements. When plotted against the corresponding values of fN, the values of [η] and [s0] for PHPG in mixtures of water and methanol of various compositions and temperatures formed smooth composite curves, and we attributed these phenomena to the fact that σ of PHPG was nearly constant under these solvent conditions. Here [s0] stands for a reduced limiting sedimentation coefficient which is equal to the inverse friction factor of the solute molecule.
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    Masthead (1970)
    New York : Wiley-Blackwell
    Biopolymers 9 (1970) 
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    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
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    Interaction of nucleic acids. VI. Interaction of purine with nucleic acids (1970)
    New York : Wiley-Blackwell
    Biopolymers 9 (1970), S. 765-782 
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    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
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    Notes: The interaction of purine with DNA, tRNA, poly A, poly C, and poly A. poly U complex was investigated. In the presence of purine, the nucleic acids in coil form (such as denatured DNA, poly A and poly C in neutral solutions, or tRNA) have lower optical rotations. In addition, hydrodynamic studies indicate that in purine solutions the denatured DNA has a higher viscosity and a decreased sedimentation coefficient. These findings indicate that through interaction with purine, the bases along the poly-nucleotide chain are unstacked and are separated farther from each other, resulting in increased assymmetry (and possibly volume) of the whole polymer. Thus, the de-naturation effect of purine reported previously can be explained by this preferential interaction of purine with the bases of nucleic acids in coil form through a hydrophobic-costacking mechanism. Results from studies on optical rotation and helix-coil transition show that the interaction of purine is greater with poly A than with poly C. The influence of temperature, Mg++ concentration, ionic strength, and purine concentration on the effect of purine on nucleic acid conformation has also been investigated. In all these situations the unraveling of nucleic acid conformation occurs at much lower temperatures (20-40°C lower) in the presence of purine (0.2-0.6M).
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    Configurational statistics of polysaccharide chains. Part II. CelluloseContribution No. 286 from Centre of advanced study in physics, University of Madras, India. (1970)
    New York : Wiley-Blackwell
    Biopolymers 9 (1970), S. 783-790 
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    Notes: The characteristic ratio of unperturbed cellulose chain was computed as a function of the angle τ at, the bridge oxygen atom and the degree of polymerization. Very high values of the order of 40 or more, depending on the angle at the bridge oxygen atom, have been obtained for this ratio, indicating that cellulose chains are highly extended. The average dimensions of cellulose chains are found to be sensitive even for small changes in the angle at the bridge oxygen, and these chains attain the character of a random coil in very high molecular weight range (degree of polymerization greater than 2000). The large differences in the unperturbed dimensions of cellulosic chains observed in different solvents have been attributed to the possible small changes in the angle τ caused by specific solvent, interactions.
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    Effect of side-chain hydrophobic bonding on the stability of homopolyamino acid α-helices: Conformational studies of poly-L-leucine in waterPresented before the Division of Biological Chemistry at the 154th National Meeting of the American Chemical Society, Chicago, Illinois, September 1967. (1970)
    New York : Wiley-Blackwell
    Biopolymers 9 (1970), S. 749-764 
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    Keywords: Chemistry ; Polymer and Materials Science
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    Notes: The conformational properties of block copolymers of poly-L-leucine in water have been examined. The degree of polymerization of the poly-L-leucine block was 11 and 21, respectively, for samples prepared by the Merrifield procedure, and 56 for a sample prepared by the polymerization of leucine N-carboxyanhydride. The optical rotatory dispersion parameter b0 was used to obtain the helix content θh at various temperatures. Application of the Lifson-Roig theory gave the following parameters for the transition of a residue from a coil to a helical state: v = 0.05-0.011, ΔH = +100 cal/mole, ΔS = +0.70-1.00 e. u. These parameters, as well as those for other polyamino acids, are accounted for by hydrophobic bonds involving the nonpolar side chains in the helical and randomly coiled forms. From the data for poly-L-alanine and theoretical values of the thermodynamic parameters for hydrophobic bond formation, the parameters for formation of a polyglycine helix are computed. By separating the contributions of the backbone, it is possible to obtain a set of thermodynamic parameters for the side-chain contributions of a number of polyamino acids. Increased size of the nonpolar side chain (with a larger contribution from hydrophobic bonding) makes a larger contribution to the stability of the α-helix which is reflected, among other ways, in a higher helix content at given temperature.
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    Polymerization of amino acid derivatives by polymer catalysts. V. Polymerization of DL-β-phenylalanine N-carboxyanhydride by several poly(N-alkylamino acid) diethylamides (1970)
    New York : Wiley-Blackwell
    Biopolymers 9 (1970), S. 791-797 
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    Keywords: Chemistry ; Polymer and Materials Science
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    Notes: The polymerization of DL-β-phenylalanine N-carboxyanhydride (NCA) initiated by poly(N-benzylglycine)diethylamide (DEA) and poly(N-methyl-DL-alanine)DEA has been investigated. As previously reported, polysarcosine DEA, poly-N-ethylglycine DEA, and poly-N-n-propylglycine DEA showed marked accelerations in the polymerization of DL-β-phenylalanine NCA as compared with the polymerization initiated by low molecular weight, amines having similar base strength. However, this phenomenon (the chain effect) was not observed with the two polymer catalysts studied in the present investigation With poly-N-methyl-DL-alanine DEA, adsorption of DL-β-phenylalanine NCA onto the polymer chain takes place, though not so effectively as with other polypeptides, so the absence of chain effect was ascribed to a reduced flexibility of the polymer chain. With poly(N-benzylglycine)DEA, the reactivity of terminal base group was found to be much lower than that of other polymer catalysts. However, the absence of the chain effect would be attributed to the rigidity of polymer chain of poly-N-benzylglycine DEA due to the bulkiness of the N-benzyl group.
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    Ionic polysaccharides. III. Dilute solution properties of hyaluronic acid fractions (1970)
    New York : Wiley-Blackwell
    Biopolymers 9 (1970), S. 799-810 
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    Keywords: Chemistry ; Polymer and Materials Science
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    Notes: Molecular weights by osmometry (M̄n), light scattering (M̄w), and sedimentation-diffusion (MsD) were determined for selected fractions and unfractionated samples of hyaluronic acid in the molecular weight range 3 × 104-1.7 × 106. For the determination of MsD from the sedimentation coefficient s, a calibration procedure based on the data of Laurent, Ryan, and Pietruszkiewicz gave the following relations in 0.2M NaCl: log (s-1)0 = 14.681 - 0.413 log MsD and log D0 = -3.828 - 0.568 log MsD, where subscript, zero refers to zero concentration and D is the diffusion coefficient. The average Mandelkern-Flory parameter β in 0.2M NaCl is 3.0 × 106. Data for the intrinsic viscosity [η] may be fitted for M 〉 105 by [η] = K′Ma, where K′, a are in 0.2M NaCl, 0.0228, 0.816; in 0.5M NaCl, 0.0318, 0.777; in 0.1 M HCl, 0.0279, 0.763, respectively. Below M = 105, [η] appears to fall below the values calculated, possibly due to non-Gaussian behavior of short chains. The second virial coefficient A2 in 0.5M NaCl approaches the ideal Donnan value, decreasing slightly with increasing molecular weight. The friction parameter P is about 20% smaller than that of uncharged polymers of similar dimensions. The flexible coiling nature of this polymer is confirmed.
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    Sedimentation of ribosomal ribonucleic acid from ribonuclease treated and untreated ribosomes (1970)
    New York : Wiley-Blackwell
    Biopolymers 9 (1970), S. 843-864 
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    Keywords: Chemistry ; Polymer and Materials Science
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    Notes: The formation of a slowly sedimenting form of 23-S ribosomal RNA from E. coli has been investigated by analytical ultracentrifugation and thermal denaturation in aqueous solution and in formamide. Evidence is presented that the slow form of 23-S arises as a result of nucleate damage to the RNA in the 50-S ribosome. The 30-S ribosome (and 16-S RNA), is unaffected. The slow form of 23-S RNA cannot be demonstrated under conditions of complete denaturation in formamide, but only by partial denaturation in aqueous solution of low ionic strength (〈 0.01M Na). Apparent maintenance of the integrity of 23-S RNA in formamide after nuclease treatment suggests that this may not be a simple linear molecule. An alternative model is suggested containing a circular element in the structure.
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    Mechanochemical study of wet-spun lithium-DNA fibers (1970)
    New York : Wiley-Blackwell
    Biopolymers 9 (1970), S. 825-842 
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    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Uniform LiDNA fiber specimens of nearly 20 m length have been prepared with a wet-spinning method developed by the author. Samples immersed in the spinning bath (80% ethyl alcohol containing 0.4M LiCl) have been subjected to mechanochemical study involving stretching, relaxation, and contraction measurements. A special technique was developed to transfer the sample from the Teflon-coated cylinder used in spinning to the sample column of the mechanochemical apparatus without stretching or removing the sample from the spinning bath. Force-strain curves of samples consisting of two fiber bundles showed an initial region of low slope followed by a region of high slope and a second region of low slope up to rupture. Some thicker specimens showed an aging effect which abolished the initial low-slope region and was interpreted as indicative of crystallization. Force-strain curves of two-bundle samples showed a strong influence of temperature with a complete loss of tensile strength of the LiDNA fibers in the spinning bath at about 55°C. Furthermore, samples at zero strain exhibited a contractile force when subjected to temperatures above about 40°C; the contractile process was pronounced with samples kept above 48°C. On contraction these samples obtained a zero-force length 20-30% of the original. These data are taken as evidence for a helix-to-coil transition occurring in the DNA, the low melting temperature being caused by the chemical influence of the ambient aqueous alcohol-LiCl bath.
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    Low-angle light-scattering studies on alkali- and heat-denatured DNA (1970)
    New York : Wiley-Blackwell
    Biopolymers 9 (1970), S. 1029-1038 
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    Keywords: Chemistry ; Polymer and Materials Science
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    Notes: The molecular weight of native DNA is shown to decrease by at least a factor of two on denaturation by heat or alkali. This result is obtained only if low-angle (〈30°) light-scattering measurements are used. High-angle measurements (〉30°) do not reveal a decrease in molecular weight on denaturation due to the incorrect value for native DNA. The dn/dc value for both native and denatured DNA is 0.166 ml/g ± 0.003 ml/g. Methods are described for the clarification of native and denatured DNA solutions for light scattering by the use of membrane filters.
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    Electric dichroism studies: Interaction of trifluoroacetic acid with poly(gamma;-benzyl L-glutamate) (1970)
    New York : Wiley-Blackwell
    Biopolymers 9 (1970), S. 991-1000 
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    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
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    Notes: Electric dichroism studies on poly(γ-benxyl L-glutamate) show that the addition of small amounts (up to 5%) of trifluoroacetic acid causes complete disappearance of dichroism in contrast to the electric birefringence, which drops to an observable plateau at 20% of its initial value. This loss of dichroism cannot be explained simply by a decrease in the effective dipole moment of the benzyl ester side chains, and the nature of this interaction is explored by nuclear magnetic resonance and infrared spectral studies. Theories of the helix-coil transition which require an initial protonation of the helix backbone to form a more flexible rod consisting of helical segments interrupted by regions of random coil are shown to be inadequate to describe the changes in poly(γ-benzyl L-glutamate) effected by small amounts of trifluoroacetic acid. Rather, trifluoroacetic acid in small amounts interacts with the ester carbonyl oxygen in the side chain, either by hydrogen bonding or protonation, before there is evidence of any effect on the backbone or of loss of helix content.
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    Raman spectra of poly-L-lysines (1970)
    New York : Wiley-Blackwell
    Biopolymers 9 (1970), S. 1229-1237 
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    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The Raman spectra of poly-L-lysine hydrochloride and poly-∊-carbobenzoxy-L-lysine in the solid state have been obtained and are consistent with the presence of an α-helical structure. The Raman spectrum of poly-L-lysine in aqueous solution suggests the presence of random coil structures.
    Additional Material: 3 Ill.
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    Backbone and side-chain conformations of amino acids and amino acid residues in peptidesContribution No. 288 from the Centre of Advanced Study in Biophysics, University of Madras, Guindu Campus, Madras-25, India. (1970)
    New York : Wiley-Blackwell
    Biopolymers 9 (1970), S. 1249-1252 
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    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
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    URL: http://dx.doi.org/10.1002/bip.1970.360091005
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    Masthead (1970)
    New York : Wiley-Blackwell
    Biopolymers 9 (1970) 
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    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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    URL: http://dx.doi.org/10.1002/bip.1970.360091101
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    Conformational studies of linear β-D-1,4′-mannan and galactanContribution No. 289 from the Centre of Advanced Study in Physics, University of Madras, Madras, India. (1970)
    New York : Wiley-Blackwell
    Biopolymers 9 (1970), S. 1239-1247 
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    Keywords: Chemistry ; Polymer and Materials Science
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    Notes: The nonbonded interaction energy of disaccharides, mannobiose and galactobiose and polysaccharides mannan and galactan have been computed as a function of dihedral angles (φ,ψ). The conformation (40°, -20°) has been preferred for the mannan chain from nonbonded interaction energy considerations. The O5…O3′ type of intramolecular hydrogen bond has been found to be possible in the above conformation. Comparison of the allowed region of mannan with those of cellulose and xylan indicates that the monomer unit, in mannan chain has slightly higher freedom of rotation than that of cellulose and less than that of xylan. As in cellulose and mannan, the freedom of rotation of the monomer units in β-1,4′ galactan is highly restricted. Unlike mannan (which prefers an extended conformation) the β-1,4′ galactan prefers a helical conformation similar to amylose. Just as in amylose the O2…O3′ type hydrogen bond between contiguous residues is also possible in β-1,4′ galactan.
    Additional Material: 7 Ill.
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    Perspectives report: Melting of DNA: Its study and application as a research methodWe are delighted to include this article in Biopolymers since it includes the important Russian literature in this area. The Editors. (1970)
    New York : Wiley-Blackwell
    Biopolymers 9 (1970), S. 1253-1306 
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    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 23 Ill.
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    URL: http://dx.doi.org/10.1002/bip.1970.360091102
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    Critical comparison of the experimental optical activity of helical polypeptides and the predictions of the molecular exciton model (1970)
    New York : Wiley-Blackwell
    Biopolymers 9 (1970), S. 1475-1502 
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    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The predictions of the presently accepted molecular exciton model for the optical activity of helical polypeptides are in reasonable agreement with experimental spectra in the accessible wavelength range. However, crucial verification requires the detect of a significant negative rotatory hand just below the accessible range. A computer-oriented method is utilized to obtain information concerning the inaccessible range. Optical rotatory dispersion computed by evaluation of the Kronig-Kramers integral transform from the experimentally determined circular dichroism of several helical homopolypeptides in solution are compared with the experimentally determined optical rotatory dispersion. Computed and experimental curves are congruent within an uncertainty approaching that of the experimental technique, whatever the polypeptide sample lot, side chains, and solvent. It is shown that t his agreement is not a computational or experimental artifact. These results can be interpreted in two ways: (1) that the predicted band does not exist, and (2) that the perturbation of the predicted band is being negated by other inaccessible bands in the vacuum ultraviolet. Arguments are presented to show that the first of these two possibilities is more probable.
    Additional Material: 10 Ill.
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    Electrophoretic charge of a cylindrical macroion in aqueous 1 : 1 electrolyte (1970)
    New York : Wiley-Blackwell
    Biopolymers 9 (1970), S. 1511-1530 
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    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The potential problem is formulated for rodlike macroions and reduced to a single dimensionless equation with appropriate boundary conditions. A method of solution based on piecewise linearization of the potential equation is detailed and compared with two other approaches. It is suggested that the present method yields improved estimates of macroion charges. Some numerical results are included, and the relation between electrophoretic charge and macroion charge is considered.
    Additional Material: 1 Tab.
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    Modern Chemistry in Industry. Proceedings of an International Union of Pure and Applied Chemistry Symposium. Herausgeg. von IUPAC. Society of Chemical Industry, London 1968. 1. Aufl., 311 S., zahlr. Abb., £ 5,50 (1970)
    Weinheim : Wiley-Blackwell
    Chemie in unserer Zeit 4 (1970), S. 64-64 
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    ISSN: 0009-2851
    Keywords: Chemistry ; Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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    URL: http://dx.doi.org/10.1002/ciuz.19700040210
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    Nucleinsäuren. Von E. Harbers Unter dem Reihentitel Einführung zur Molekularbiologie. Georg Thieme Verlag, Stuttgart 1969. 1. Aufl., XII, 216 S., 136 Abb., 8 Tab., flex. DM 9,- (1970)
    Weinheim : Wiley-Blackwell
    Chemie in unserer Zeit 4 (1970), S. 64-65 
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    Keywords: Chemistry ; Chemistry
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    URL: http://dx.doi.org/10.1002/ciuz.19700040211
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    Wege und Irrwege der Naturwissenschaft. Von I. Asimov. Econ-Verlag, Düsseldorf-Wien 1969. 1. Aufl., 273 S., geb. DM 18,- (1970)
    Weinheim : Wiley-Blackwell
    Chemie in unserer Zeit 4 (1970), S. 65-65 
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    ISSN: 0009-2851
    Keywords: Chemistry ; Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
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    URL: http://dx.doi.org/10.1002/ciuz.19700040214
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    Chronik (1970)
    Weinheim : Wiley-Blackwell
    Chemie in unserer Zeit 4 (1970), S. 66-68 
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    Keywords: Chemistry ; Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
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    URL: http://dx.doi.org/10.1002/ciuz.19700040215
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    Wasserstoffbrückenbindungen und ihre Bedeutung in der Biologie (1970)
    Weinheim : Wiley-Blackwell
    Chemie in unserer Zeit 4 (1970), S. 69-80 
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    Keywords: Chemistry ; Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 17 Ill.
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    URL: http://dx.doi.org/10.1002/ciuz.19700040302
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    Hydroborierung (1970)
    Weinheim : Wiley-Blackwell
    Chemie in unserer Zeit 4 (1970), S. 95-98 
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    Keywords: Chemistry ; Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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    URL: http://dx.doi.org/10.1002/ciuz.19700040305
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    Chronik (1970)
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    Chemie in unserer Zeit 4 (1970), S. 129-132 
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    Keywords: Chemistry ; Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
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    URL: http://dx.doi.org/10.1002/ciuz.19700040407
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    Moderne Rauschgifte (1970)
    Weinheim : Wiley-Blackwell
    Chemie in unserer Zeit 4 (1970), S. 152-158 
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    Keywords: Chemistry ; Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
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    Additional Material: 4 Ill.
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    Das Experiment: Kinetische Messungen bei der radikalischen Styrolpolymerisation (1970)
    Weinheim : Wiley-Blackwell
    Chemie in unserer Zeit 4 (1970), S. 159-162 
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    Keywords: Chemistry ; Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
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    Additional Material: 4 Ill.
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    Masthead (1970)
    Weinheim : Wiley-Blackwell
    Chemie in unserer Zeit 4 (1970) 
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    Keywords: Chemistry ; Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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    Chronik (1970)
    Weinheim : Wiley-Blackwell
    Chemie in unserer Zeit 4 (1970), S. 163-164 
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    Keywords: Chemistry ; Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
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    Zur Chemie der Jupiter-Atmosphäre (1970)
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    Chemie in unserer Zeit 4 (1970), S. 177-179 
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    Keywords: Chemistry ; Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
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    Additional Material: 4 Ill.
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    Die Molekularbiologie der Bewegung (1970)
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    Chemie in unserer Zeit 4 (1970), S. 165-176 
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    Keywords: Chemistry ; Chemistry
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    Additional Material: 14 Ill.
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    Chemiker im Gespräch: Erich Hückel (1970)
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    Chemie in unserer Zeit 4 (1970), S. 180-187 
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    Keywords: Chemistry ; Chemistry
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    Optische Aktivität und Molekülsymmetrie (1970)
    Weinheim : Wiley-Blackwell
    Chemie in unserer Zeit 4 (1970), S. 188-193 
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    Keywords: Chemistry ; Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
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    Additional Material: 6 Ill.
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    The Chemistry of Matter. Von J.B. Pierce. Houghton Mifflin Company, Boston 1970. 1. Aufl., XI, 799 S. zahlr. Abb., geb. $10.50 (1970)
    Weinheim : Wiley-Blackwell
    Chemie in unserer Zeit 4 (1970), S. 194-194 
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    ISSN: 0009-2851
    Keywords: Chemistry ; Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
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    URL: http://dx.doi.org/10.1002/ciuz.19700040606
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    The Behavior of Matter. Laboratory Experiments in Introductory Chemistry. Teil I und II. Von S. S. Biechler. Houghton Mifflin Company, Boston 1970. 1. Aufl., Teil I: XV, 270 S., zahlr. Abb. und Tab. geb. $ 4.50; Teil II: VII, 79 S., zahlr. Abb. und Tab., geb. $ 1.65 (1970)
    Weinheim : Wiley-Blackwell
    Chemie in unserer Zeit 4 (1970), S. 194-195 
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    Keywords: Chemistry ; Chemistry
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    Anorganische Chemie. Eine grundlegende Betrachtung. Heidelberger Taschenbücher, Bd. 63. Von Z. G. Szabó. Springer-Verlag, Berlin - Heidelberg - New York, 1969. 1. Aufl., VIII, 159 S., 16 Ab., 20 Tab., geh. DM 14,80 (1970)
    Weinheim : Wiley-Blackwell
    Chemie in unserer Zeit 4 (1970), S. 195-195 
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    Keywords: Chemistry ; Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
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    Deutsche Nobelpreisträger. Deutsche Beiträge zur Natur- und Geisteswissenschaft, dargestellt am Beispiel der Nobelpreisverleihungen für Frieden, Literatur, Medizin, Physik und Chemie. Herausgeg. von A. Hermann, J. Kolbe, Grete Ronge, E. Weber und R. Winau. Heinz Moos Verlagsgesellschaft, München 1969. 1. Aufl., 172 S., 162 Portraits und Vignetten, 3 Farbtafeln, geb. DM 18, -  (1970)
    Weinheim : Wiley-Blackwell
    Chemie in unserer Zeit 4 (1970), S. 196-196 
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    Keywords: Chemistry ; Chemistry
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    Chronik (1970)
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    Chemie in unserer Zeit 4 (1970), S. 197-198 
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    Keywords: Chemistry ; Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
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    URL: http://dx.doi.org/10.1002/ciuz.19700040614
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    Zellphysiologie des Stoffwechsels. Von D. Pette. Bd. 13 der Konstanzer Universitätsreden. Herausgeg. von G. Hess. Konstanzer Universitätsverlag 1970. 50 S., brosch. DM 4,80 (1970)
    Weinheim : Wiley-Blackwell
    Chemie in unserer Zeit 4 (1970), S. 196-196 
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    ISSN: 0009-2851
    Keywords: Chemistry ; Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
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    URL: http://dx.doi.org/10.1002/ciuz.19700040613
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    Über Silikone, XLIV. Umsetzung von Tetrachlorkohlenstoff mit Silicium (1959)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 92 (1959), S. 1018-1027 
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    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Bei nochmaliger Untersuchung der Umsetzung von CCl4 mit Si/Cu-Gemischen werden, wie bereits bekannt, SiCl4, C2Cl4 und Si2Cl6 gefunden. Darüber hinaus lief eine direkte Synthese. Sie führte wahrscheinlich zur Bildung des allerdings dabei nicht nachgewiesenen Cl3C·SiCl3. Dagegen wurde die nach der direkten Synthese entstandene Verbindung C(SiCl3)4 erstmalig aufgefunden.  -  Die Entstehung der ebenfalls nachgewiesenen Verbindungen Cl3SiC·C⋮CC·SiCl3 und Cl3SiC·(Cl)C:C(Cl)C·SiCl3 wird durch Dechlorierungen des Cl3CC·SiCl3 mit Kupfer erklärt.  -  Für die neuen Verbindungen wurden Strukturbeweise geführt. Es wurden C2Cl4 und Cl3CC·SiCl3 mit Si/Cu-Gemischen umgesetzt. Die letzte Umsetzung ergab dieselben Reaktionsprodukte wie das CCl4, so daß auch bei diesem eine direkte Synthese über das Cl3CC·SiCl3 glaubhaft gemacht ist.
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    Zur Struktur von Organoschwefelverbindungen, II. Eigenschaften von Thionitriten (1959)
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    Berichte der deutschen chemischen Gesellschaft 92 (1959), S. 1048-1055 
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    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Eigenschaften von tert.-Butylthionitrit, Triphenylmethylthionitrit und tert.-Butylthionitrat werden Rückschlüsse auf die Elektronenstruktur der schwefelhaltigen Gruppe gezogen.
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    Über die säurekatalysierte Aldolreaktion des Formaldehyds mit Aceton. Zur Kenntnis der Anhydro-ennea-heptose. Die Synthese der Bisanhydro-ennea-heptose (1959)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 92 (1959), S. 1072-1081 
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    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Als weiteres Beispiel für die präparative Überlegenheit der säurekatalysierten Aldolreaktionen des Formaldehyds gegenüber den OH⊖-katalysierten wird über die Synthese der bisher unbekannten Bisanhydro-ennea-heptose, die das Ringsystem des 3.7-Dioxa-bicyclo-[1.3.3]-nonans enthält, berichtet.  -  Bei der Untersuchung des Verhaltens der Bisanhydro-ennea-heptose gegen Alkalien machten sich in der Abspaltbarkeit der Hydroxymethylgruppen charakteristische Unterschiede geltend, deren Erklärung in den konstitutionell-konstellativen Gegebenheiten zu suchen ist.  -  Bei dem Versuch einer Ringerweiterung an der Anhydro-ennea-heptose mit Diazomethan bildet sich eine Verbindung C9H16O5, die wahrscheinlich kein Derivat des Oxa-cycloheptanons-(4), sondern ein Derivat des Tetrahydro-γ-pyrons ist.
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    1-Veratryl-isochinolin-Derivate (1959)
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    Berichte der deutschen chemischen Gesellschaft 92 (1959), S. 1092-1101 
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    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Substituierte Ammoniumsalze vom Typ I liefern mit Abkömmlingen des Phenylglyoxals in Methanol in glatter Reaktion Lactolid-Basen vom Typ II. Aus diesen lassen sich verschiedene Octa- bzw. Decahydroisochinolin-Derivate darstellen, die in 1-Stellung einen substituierten Benzylrest tragen.
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    Autoxydation von Kohlenwasserstoffen, XXIII. Zur jodometrischen Bestimmung organischer Hydroperoxyde (1959)
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    Berichte der deutschen chemischen Gesellschaft 92 (1959), S. 1115-1117 
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    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die jodometrische Bestimmung der Hydroperoxyde von Benzolkohlenwasserstoffen kann durch katalytische Wirkung von Kupferionen verbessert werden.
    Additional Material: 1 Ill.
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    URL: http://dx.doi.org/10.1002/cber.19590920517
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    Eine vereinfachte Oligosaccharid-Synthese (1959)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 92 (1959), S. 1135-1139 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die Umsetzung von Tetraacetyl-α-D-glucopyranosylbromid und Tetraacetyl-6-trityl-β-D-glucopyranose mit Silberperchlorat oder Silberfluoroborat in Nitromethan liefert in guter Ausbeute Octaacetyl-β-gentiobiose. Die gleiche Umsetzung mit einem Überschuß an Tetraacetyl-α-D-glucopyranosylbromid und Silberperchlorat führt zur Octaacetyl-α-gentiobiose. Es wird eine Deutung des Reaktionsablaufs gegeben.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19590920521
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  • 82
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    Studien in der Vitamin D-Reihe, XXVIII. Photo-Isomerisierung des Tachysterins2 zum Präcalciferol (1959)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 92 (1959), S. 1126-1129 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Tachysterin2 wurde mit durch Glas gefiltertem Quecksilberdampflicht in Präcalciferol2 umgewandelt.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19590920519
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  • 83
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    Radiochemische Untersuchungen über die Mercurierung von Ammonium-Ionen in wäßrigen Lösungen mit 203Hg (1959)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 92 (1959), S. 1152-1158 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Um eine Aussage über den Reaktionsmechanismus bei der Mercurierung des Ammonium-Ions in wäßrigen Lösungen machen zu können, wurde Quecksilber-(II)-diamminchlorid, Hg(NH3)2Cl2, mit wäßriger Ammoniumacetat-Lösung zum sog. „unschmelzbaren Präzipitat“, HgNH2Cl, umgesetzt. Die Lösung enthielt 1 Mol. 203Hg(CH3CO2)2 pro Mol. des Diammoniakates.Die beiden heterogenen Austauschreaktionen Hg(NH3)2Cl2/[203Hg(NH3)4]2⊕ und HgNH2Cl/[203Hg(NH3)4]2⊕ wurden in Abhängigkeit von der Temperatur untersucht.
    Additional Material: 3 Ill.
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    URL: http://dx.doi.org/10.1002/cber.19590920524
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  • 84
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    Isomere Decalindiole-(1.4) (1959)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 92 (1959), S. 1158-1163 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Von den sechs möglichen Isomeren des Decalindiols-(1.4) wurden zwei der Reihe des cis-Decalins und zwei der Reihe des trans-Decalins angehörende Diole durch Reduktion von cis- und trans-Decalindion-(1.4) sowie durch katalyt. Hydrierung von Naphthohydrochinon-(1.4) und ar-Tetralindiol-(5.8) mit Raney-Nickel im Autoklaven erhalten, eindeutig der cis- und trans-Reihe zugeordnet und durch Derivate charakterisiert.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19590920525
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  • 85
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    Eine neue Methode zur Darstellung langkettiger Carbonsäuren, XVI. Über die Japp-Klingemann-Reaktion bei monoalkylierten Dihydroresorcinen (1959)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 92 (1959), S. 1184-1188 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die Einwirkung von Aryldiazoniumsalzen auf verschiedene monoalkylierte Dihydroresorcine wurde untersucht. Dabei wurden im glatten Reaktionsverlauf δ-Keto-δ-arylhydrazono-carbonsäuren erhalten. Die gleiche Reaktion führte beim 2-Acetamino-dihydroresorcin infolge einer sekundär verlaufenden Wasserabspaltung zu einem Derivat des 1.2.4-Triazols, dessen Konstitution bewiesen wurde.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19590920529
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  • 86
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    Stickstoffhaltige Peroxyde, I. Aminoalkylierung von Alkylhydroperoxyden (1959)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 92 (1959), S. 1206-1212 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Durch Umsetzung von Alkylhydroperoxyden oder Wasserstoffperoxyd mit Formaldehyd und sekundären Aminen werden nach Art der Mannich-Reaktion Aminoalkylperoxyde erhalten. In mineralsaurer Lösung gelingt auch die Umsetzung von Benzamid oder Harnstoff mit Formaldehyd und Alkylhydroperoxyden.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19590920532
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  • 87
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    Über bi- und polycyclische Azulene, XXXIX. Carboxychlorierung von Azulenen (1959)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 92 (1959), S. 1216-1223 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die Einführung der Carbonsäurechloridgruppe in 1- bzw. 3-Stellung des Azulensystems gelingt durch Substitution mittels Phosgens ohne Friedel-Crafts-Katalysatoren. Befindet sich in Nachbarstellung zur Carbonsäurechloridgruppe am 7-Ring kein Substituent, so lassen sich die Verbindungen zu den freien Carbonsäuren hydrolysieren, andernfalls tritt Decarboxylierung ein. Die Säurechloride lassen sich in Ester, Amide und Anilide überführen. Die spektralen Verschiebungen gegenüber den zugrunde liegenden Azulenen werden diskutiert.
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    URL: http://dx.doi.org/10.1002/cber.19590920534
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  • 88
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    Verbindungen der Hexahydro-adrenalin-Reihe (1959)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 92 (1959), S. 1195-1205 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die Hydrierung des Adrenalins mit Raney-Nickel liefert keine brauchbaren Ergebnisse. Das Hexahydro-adrenalin (Xb) wird deshalb synthetisch aus Tetrahydro-benzaldehyd in 5 Stufen in guter Ausbeute dargestellt. Es wird gezeigt, daß das synthetische Produkt eine sterisch weitgehend einheitliche Verbindung ist und die 3(trans).4(cis)-Konfiguration besitzt.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19590920531
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  • 89
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    Stickstoffhaltige Peroxyde, II. Peroxyde aus Enaminen (1959)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 92 (1959), S. 1212-1215 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Aus cyclischen Ketonen und sekundären Aminen erhältliche α.β-ungesättigte Amine addieren Wasserstoffperoxyd an der Doppelbindung und geben kristalline Peroxyde.
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    URL: http://dx.doi.org/10.1002/cber.19590920533
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    Berichtigung (1959)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 92 (1959), S. 1237-1237 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19590920537
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  • 91
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    Einige Umsetzungen des Tetrahydroxy-p-benzochinons (1959)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 92 (1959), S. 1239-1246 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Tetrahydroxy-p-benzochinon zeigt einige Eigenschaften, die es als „doppeltes aci-Redukton“ erscheinen lassen. So erleidet es „Diazo-Spaltung“ unter Bildung von Mesoxalsäure-bis-arylhydrazid. Diazomethan verwandelt es in den Tetramethyläther, der leicht, sogar durch den Ausgangsstoff, zum entspr. Hydrochinon reduziert wird. Es werden noch Acetyl- und Aminoderivate des Tetrahydroxy-p-benzochinons und seines Dimethyläthers beschrieben sowie die UV- und IR-Spektren diskutiert.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19590920602
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  • 92
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    Synthese weiterer Oligopeptide aus L-Glutaminsäure und Glycin sowie L-Tyrosin (1959)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 92 (1959), S. 1276-1287 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Ausgehend von den in der ersten Veröffentlichung(1) beschriebenen Substanzen wurden Derivate der folgenden Peptide synthetisiert: Glycyl-L-glutaminsäure, Glycyl-glycyl-L-glutaminsäure, γ-L-Glutamyl-glycin, α- und γ-L-Glutamylglycyl-L-glutaminsäure, α- und γ-L-Glutamyl-α-L-glutamyl-glycin und α-L-Glutamyl-L-tyrosin. Auch einige freie Peptide konnten erhalten werden. Als interessante Nebenprodukte der Peptidsynthese über gemischte Anhydride mit Kohlensäure-halbestern wurden in zwei Fällen Diacylimide erhalten.
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    URL: http://dx.doi.org/10.1002/cber.19590920608
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    Überführung von D-Glucosamin in Oxazolon- und OxazolinderivateVorliegende Arbeit wurde mit Hilfsmitteln ausgeführt, die die Rockefeller Foundation in dankenswerter Weise meinem Laboratorium zur Verfügung stellte. L. Zervas. (1959)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 92 (1959), S. 1288-1293 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Beim Behandeln von N-Benzoyl-D-glucosamin (IV) mit chlorwasserstoffhaltigem Aceton entsteht das Acetonderivat VII eines Phenyloxazolins, welches Furanosestruktur besitzt. Dieses wird mit chlorwasserstoffhaltigem Methanol in das entsprechende Aceton-β-methylfuranosid IX und anschließend in das acetonfreie β-Methylfuranosid X umgewandelt.  -  Behandeln von O-Tetraacetyl-N-carbobenzoxy-D-glucosamin (XI) mit TiCl4 oder mit AlCl3/PCl5 führt unter Abspaltung von Benzylchlorid zur Bildung eines Oxazolonderivates (XIII).
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    Derivate der Zucker-mercaptale, XVI. Methylphenylhydrazone und Phenylosazone der Monobenzoyl-aldosen (1959)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 92 (1959), S. 1313-1319 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die Methylphenylhydrazone der Monobenzoyl-aldosen liegen im kristallisierten und gelösten Zustand nur als Schiffsche Basen vor, sie zeigen keine Mutarotation und lassen sich zu 5-Benzoyl-2.3.4-triacetyl-pentose- bzw. 6-Benzoyl-2.3.4.5-tetraacetyl-hexose-methylphenylhydrazonen acetylieren, deren Struktur durch Synthese bewiesen wird. Die aus Monobenzoyl-aldose-phenylhydrazonen mit Phenylhydrazin darstellbaren Monobenzoyl-aldose-phenylhydrazonen werden sehr leicht zu Aldose-phenylosazonen und Benzoesäure hydrolysiert.
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    Über substituierte Pivalophenone (1959)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 92 (1959), S. 1329-1335 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die Darstellung des Monobrom-, Monojod- und Trimethoxy-pivalophenons werden beschrieben. Die Halogenverbindungen erleiden bei der Einwirkung wäßriger Alkalien eine hydrolytische Spaltung. Die Methoxyverbindung ist gegen Alkalien stabil.
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    URL: http://dx.doi.org/10.1002/cber.19590920615
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  • 96
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    Über die Anlagerung von Pyrrol, 1- und 2-Methyl-pyrrol an β-Aroyl-acrylsäuren (1959)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 92 (1959), S. 1363-1366 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: β-Aroyl-acrylsäuren reagieren mit Pyrrol, 1- und 2-Methyl-pyrrol nach dem Schema der substituierenden Addition.
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    URL: http://dx.doi.org/10.1002/cber.19590920619
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  • 97
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    Zur Chemie der p-Chinole, I. Darstellung des 17β-Hydroxy-östra-p-chinols und seiner Acetate (1959)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 92 (1959), S. 1386-1397 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Durch Oxydation von Tetralol-(6) und Östradiol-17-monoacetat mit Bleitetraacetat werden Tetralin-p-chinolacetat und 17β-Acetoxy-östra-p-chinol-(10ζ)-acetat dargestellt. Aus den Chinolacetaten lassen sich die Chinole durch basenkatalysierte Umesterung in Freiheit setzen. Dem aufgezeigten Weg kommt allgemeine Bedeutung zur Darstellung von p-Chinolen zu.
    Additional Material: 2 Ill.
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    URL: http://dx.doi.org/10.1002/cber.19590920623
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    Synthetische Arbeiten in der Reihe der aromatischen Erythrina-Alkaloide, II. Eine neue Vorstufe zum Aufbau von Erythrinanen (1959)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 92 (1959), S. 1472-1477 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: β-Phenyl-äthylamine lassen sich mit Cyclohexanon-(2)-essigsäure zu partiell hydrierten Oxindol-Derivaten kondensieren, die durch Ringschluß in Verbindungen der Erythrinan-Reihe übergeführt werden.
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    URL: http://dx.doi.org/10.1002/cber.19590920633
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    Notiz zur Acylierung von Hydrazin mit Chlorameisensäure-benzylester (1959)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 92 (1959), S. 1478-1480 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Umsetzung von Chlorameisensäure-benzylester mit überschüssigem Hydrazinhydrat in absol. Chloroform ergibt Carbobenzoxy-hydrazin. In wäßrigem Medium entsteht vorwiegend N.N′-Dicarbobenzoxy-hydrazin (I), das von rauchender Salpetersäure leicht zu Azodicarbonsäure-dibenzylester (II) dehydriert wird.
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    Über Kumulene, X.IX. Mitteil.: R. Kuhn und H. Fischer, Angew. Chem. 70, 705 [1958].cis-trans-Isomerie bei Dinitro-tetraphenyl-kumulenenTeil der Dissertat. D. Blum, Univ. Heidelberg 1957. (1959)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 92 (1959), S. 1483-1500 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Es wurden 2 Tetraphenyl-äthylene, 2 Tetraphenyl-butatriene und 2 Tetraphenyl-hexapentaene mit je 2 meta- bzw. para-ständigen Nitrogruppen dargestellt. Es gelang, die beiden Äthylene durch Kristallisation und das Butatrien mit m-ständigen NO2-Gruppen durch Chromatographie in der cis- und in der trans-Form zu gewinnen. Damit ist bei einem zweiten Beispiel die von J. H. van't Hoff 1874 vorausgesagte Isomerie an einer Verbindung verwirklicht worden, in der 4 C-Atome durch 3 Doppelbindungen verknüpft sind.  -  Die Isomeren des Triens sind lichtempfindlich. Das Mengenverhältnis cis : trans im photochemischen Gleichgewicht entspricht der Zusammensetzung des Kumulens, wie es bei der Synthese anfällt. Die thermische cis-trans-Umlagerung der Butatriene läßt sich vorzüglich IR-spektroskopisch verfolgen. Die Zuordnung der mit A und B bezeichneten isomeren Butatriene zur cis- und trans-Formel wird diskutiert.  -  Von den beiden Hexapentaenen konnte dasjenige mit 2 p-ständigen Nitrogruppen in roten Kristallen, aber nicht in cis-trans-isomeren Formen gewonnen werden. Das entsprechende Hexapentaen mit 2 m-ständigen NO2-Gruppen war in Lösung beständig, es zersetzte sich aber teilweise bei Entfernung des Lösungsmittels.
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    URL: http://dx.doi.org/10.1002/cber.19590920702
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