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1

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The extrinsic cotton effects of nitrobenzylic chromophore bound to helical poly-α,L-glutamic acid (1973)

Loucheux, M.-H. ; Duflot, C.

New York : Wiley-Blackwell

Biopolymers 12 (1973), S. 121-125

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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: 3 Ill.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/bip.1973.360120111

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Effect of degree of polymerization and steric configuration of poly(2-vinylpyridine) as catalyst in the polymerization of phenylalanine NCAThis is the sixth paper in the series of Polymerization of Amino Acid Derivatives by Polymer Catalysts. For the previous paper, see M. Sisido et al., Biopolymers, 9, 791 (1970). (1973)

Imanishi, Yukio ; Nagaoka, Shoji ; Suzuoki, Kazuhiro ; [et al.]

New York : Wiley-Blackwell

Biopolymers 12 (1973), S. 181-191

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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: Despite its being weaker base poly(2-vinylpyridine) polymerized DL-β-phenylalanine NCA at a much faster rate than pyridine and α-picoline. Poly(2-vinylpyridine) adsorbs NCA by hydrogen bonding with the cooperation of a few pyridine groups. This results in a high local concentration of NCA. The syndiotactic configuration of pyridine group seemed to be least suitable for the cooperative hydrogen bonding. Adsorbed NCA is activated to form an “activated” NCA which in turn reacts with an NCA adsorbed on the same polymer chain. Since the polymer chain is flexible, this intramolecular reaction takes place frequently, resulting in the acceleration of polymerization. The intramolecular reaction along the polymer chain is dependent on the degree of polymerization of polymer catalyst. A suitable model was proposed for the intramolecular reaction to explain the effect of degree of polymerization.

Additional Material: 6 Ill.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/bip.1973.360120117

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3

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Single- and double-strand breaks in 5-bromouracil-substituted DNA of B. subtilis and phage PBSH after irradiation with long-wave length UV and their correlation to intramolecular energy transfer (1973)

Mönkehaus, Friedrich ; Köhnlein, Wolfgang

New York : Wiley-Blackwell

Biopolymers 12 (1973), S. 329-340

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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: 5-Bromouracil-substituted DNA was isolated form B. Subtilis and phage PBSH. The three DNA fractions of Different densities (TT, TB, and BB) were irradiated with u.v. (313nm). The number of single-strand and double-strand breaks was determined. The breakage rates are given. It was found that in hybrid DNA (TB) double-strand breaks occur depending linearly on dose. In BB-DNA the observed double-Strand bresks can be divided into two fractions with a linear and quadratic dose dependence respectively. The results can be explained by assuming intramolecular energy transfer from the BU-containing strand to its complementary strand.

Additional Material: 6 Ill.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/bip.1973.360120210

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4

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Calorimetric investigations of crystalline 3′,5′-cyclic nucleotides (1973)

Bryan, A. M. ; Olafsson, P. G.

New York : Wiley-Blackwell

Biopolymers 12 (1973), S. 229-235

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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: Differential enthalpic analysis of a series of 3′,5′-cyclic nucleotides indicates that homolytic cleavage of the six-membered phosphate ring occurs either immediately prior to or concurrent with decomposition of the crystal lattice. Homolysis is followed by a rapid polymerization to yield oligonucleotides. The enthalpies of these reactions have, with the exception of guanosine 3′,5′-cyclic phosphate, almost identical values of 25 kcal/mole. The anomalous case is attributed to a more stabilized phosphate ring as a result of hydrogen bonding through the two position of the purine ring. The pair of overlapping exothermic peaks observed in each of the thermograms for cAMP and cIMP is related to the presence of two conformational arrangements within the unit cell of each compound.

Additional Material: 1 Ill.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/bip.1973.360120203

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5

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An extended Hückel molecular orbital approach to the study of the electronic structures and barriers to Syn-Anti interconversion in Syn purine nucleosides (1973)

Jordan, Frank

New York : Wiley-Blackwell

Biopolymers 12 (1973), S. 243-255

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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 total energy and the electronic properties of some syn purine nucleosides have been determined as a function of the rotation angle around the C-N glycosidic linkage. Invariably, the crystallographic coordinates provide a state lying at or very near the minimum on the potential energy curve according to the extended Hückel parametrization here employed. The ribose moiety always carries a net positive charge whereas the base is always negatively charged. Changes in dipole moment magnitudes for the overall structure as well as in net atomic charges are noted upon rotation around the glycosidic linkage indicating that potential functions for polynucleotides may be in error if such changes are ignored.

Additional Material: 2 Ill.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/bip.1973.360120205

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6

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Showing up the thermal transconformation of Na-DNA in solution by noise spectrography (1973)

Vasilescu, Dane ; Teboul, Maurice ; Kranck, Hubert ; [et al.]

New York : Wiley-Blackwell

Biopolymers 12 (1973), S. 341-352

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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: Measuring the equivalent noise resistance of Na-DNA solutions in NaCl provides in formation about the free ino atmosphere. In an Arrhenius type diagram, the helix → coil transition is clearly brought Out. A Calculation of the number of free ions in the solution as function of temperature, reveals once more the process of ejection of compensating Na+ ions form the macromolecules during the thermal transconformation.

Additional Material: 7 Ill.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/bip.1973.360120211

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7

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Circular dichroism and molecular conformation of copper(II)-gramicidin S complexes (1973)

Santis, P. De ; D'Ilario, L. ; Lamanna, G. ; [et al.]

New York : Wiley-Blackwell

Biopolymers 12 (1973), S. 423-433

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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: Optical properties in different solvents of gramicidin-bis (salicylaldimine) Cu(II) and (5-I-salicyladimine) Cu(II) chelates are intercepted in terms of their molecular structure. A molecular model for the inversion of Contton effects in two different classes of solvents is proposed. This explanation is supported by the study of optical properties of model compounds.

Additional Material: 7 Ill.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/bip.1973.360120217

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8

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Masthead (1973)

New York : Wiley-Blackwell

Biopolymers 12 (1973)

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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.1973.360120301

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9

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Studies on cytochrome c. Part III. Synthesis of the protected heneicosapeptide (sequence 24-44) of Baker's yeast iso-1-cytochrome cThe amino acid residues are of L-configuration. For a simpler description the customary L-designation for individual amino acid residues is omitted. Standard abbreviations for amino acid derivatives and peptides are used according to the suggestion of the IUPAC-IUB Commission on Biochemical Nomenclature, European J. Biochem., 1, 375 (1967). (1973)

Moroder, Luis ; Borin, Gianfranco ; Marchiori, Fernando ; [et al.]

New York : Wiley-Blackwell

Biopolymers 12 (1973), S. 507-520

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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: Syntheses are described for two N-benzyloxycarbonylpeptide tert-butoxycarbonylhydrazides which correspond to positions 24-34 and 35-44, respectively, of the primary structure of baker's yeast iso-1-cytochrome c. The two peptide derivatives were coupled via the azide procedure to form the N-benzyloxycarbonylheneicosapeptide tert-butoxycarbonylhydrazide (sequence 24-44).

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/bip.1973.360120305

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10

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The rate of γ-benzyl-L-glutamate NCA polymerizations (1973)

Williams, Fred D. ; Brown, Ronald D.

New York : Wiley-Blackwell

Biopolymers 12 (1973), S. 647-654

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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 primary amine initiated homopolymerization of γ-benzyl-L-glutamate NCA in dioxane at 25°C, 35°C, 50°C, and 65°C has been investigated. The reactions were virtually independent of temperature indicating an activation energy of less than 1 kcal/mole. The entropy of activation was estimated to be -65 entropy units at 300°K. The reaction proceeded in two stages. The first stage was zero-order with respect to monomer, whereas the second was first-order with respect to monomer. Both stages were first-order with respect to initiator. These results were interpreted by assuming that the rate constant for propagation was not independent of the degree of polymerization up to the point where a conformational transition to α-helix occurred.

Additional Material: 6 Ill.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/bip.1973.360120316

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