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  • 1
    Electronic Resource
    Electronic Resource
    Absorption spectra of nucleotides, polynucleotides, and nucleic acids in the far ultraviolet (1963)
    New York : Wiley-Blackwell
    Biopolymers 1 (1963), S. 193-208 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Ultaviolet absorption spectra down to 185 mμ are presented for a number of nucleic acids and synthetic polynucleotides in the helical and random forms, and of their constituent mononucleotides, as well as the corresponding nucleosides and free bases. A short wavelength absorption band is in all cases observed with a maximum varying between about 187 and 201 mμ. These bands are more intense than those near 260 mμ. The helical polymers show a hypochromic effect in this region of a somewhat similar magnitude to that in the 260 mμ region. Other spectral phenomena accompanying denaturation and degradation are described.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.360010302
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  • 2
    Electronic Resource
    Electronic Resource
    Application of the titration method to studies on the denaturation of sodium deoxyribonucleate (1957)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 23 (1957), S. 765-779 
    Details
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: A method is described whereby the difference between the irreversible forward titration curve from neutrality to pH 2.5 and the reversible back titration curve from pH 2.5 can be used to determine the extent and character of denaturation (i.e., rupture of hydrogen bonds) in various treatments of sodium deoxyribonucleate (DNA) prior to titration. On this basis, the effects of heat, ultrasonic waves, and γ-rays are examined. Denaturation by ionization of the hydrogen-bonded amino groups has been studied as a function of temperature and of pH. Some of the kinetic and statistical consequences of the observations are discussed in terms of a model requiring the rupture of a minimum sequence of hydrogen bonds for denaturation to occur.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1957.1202310419
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  • 3
    Electronic Resource
    Electronic Resource
    The influence of ionic strength on the viscosity of ribonucleic acid and other polyelectrolytes (1960)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 47 (1960), S. 441-447 
    Details
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The viscosity of a number of diverse polyelectrolytes varies with the concentration of added electrolyte according to the relation \documentclass{article}\pagestyle{empty}\begin{document}$ \left[ \eta \right] = \left[ {\eta _0 } \right]\left( {{{C_{{\rm salt}} } \mathord{\left/ {\vphantom {{C_{{\rm salt}} } {C_{{\rm salt}}^{^ \circ } }}} \right. \kern-\nulldelimiterspace} {C_{{\rm salt}}^{^ \circ } }}} \right)^{ - m} $\end{document} except in very dilute salt solutions; [η] and [η0] are the limiting viscosity numbers in solutions of electrolyte concentration Csalt and C°salt, respectively (the latter concentration being that of any reference solution), and m is a constant whose value depends on the permeability of the polyion. This relation can be accounted for by the theory of Flory. The viscosities of several polyvinyl derivatives are found to be very similar, indicating that the ionizing group has no specific influence upon coil dimensions. In contrast, polynucleotides do not conform to this pattern; in particular, sodium ribonucleate undergoes an unusually large contraction to a highly compact flexible configuration between sodium chloride concentrations of 1 and 10 mM.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1960.1204714939
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  • 4
    Electronic Resource
    Electronic Resource
    Kinetics of the reaction HO2 + NO2(+M) = HO2NO2 using molecular modulation spectrometry (1979)
    New York, NY : Wiley-Blackwell
    International Journal of Chemical Kinetics 11 (1979), S. 635-648 
    Details
    ISSN: 0538-8066
    Keywords: Chemistry ; Physical Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Rate constants for the reaction HO2 + NO2(+ M) = HO2NO2(+ M) have been obtained from direct observations of the HO2 radical using the technique of molecular modulation ultraviolet spectrometry. HO2 was generated by periodic photolysis of Cl2 in the presence of excess H2 and O2, and k1 was determined from the measured concentrations and lifetime of HO2 with NO2 present. k1 increased with pressure in the range of 40-600 Torr, and a simple energy transfer model gave the following limiting second- and third-order rate constants at 283 K: k1∞ = 1.5 ± 0.5 × 10-12 cm3/molec·sec and k1III = 2.5 ± 0.5 × 10-31 cm6/molec·sec. The ultraviolet absorption spectrum of peroxynitric acid was also recorded in the range of 195-265 nm; it showed a broad feature with a maximum at 200 nm, σmax = 4.4 × 10-18 cm2.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/kin.550110610
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  • 5
    Electronic Resource
    Electronic Resource
    Product formation in the association reaction of ClO with NO2 investigated by diode laser kinetic spectroscopy (1984)
    New York, NY : Wiley-Blackwell
    International Journal of Chemical Kinetics 16 (1984), S. 445-467 
    Details
    ISSN: 0538-8066
    Keywords: Chemistry ; Physical Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Diode laser spectroscopy has been employed to monitor the formation of chlorine nitrate (ClONO2) in the association reaction of ClO with NO2. Chlorine nitrate is the only stable end-product of this reaction at room temperature. Time-resolved measurements of ClONO2 formation using molecular modulation showed no evidence for any involvement of unstable isomers of ClNO3 in the reaction. These measurements gave a value of k1 = (1.8 ± 0.4) × 10-31 cm6/molecule2 · s for the reaction \documentclass{article}\pagestyle{empty}\begin{document}$$ {\rm ClO}\,\, + \,\,{\rm NO}_{\rm 2} \,\, + \,\,{\rm M}\mathop {\longrightarrow} \limits^{k_1 } {\rm ClONO}_{\rm 2} \,\, + \,\,{\rm M} $$\end{document} at 295 K and an upper limit of 5 ms for the lifetime of any isomeric products at this temperature.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/kin.550160412
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  • 6
    Electronic Resource
    Electronic Resource
    The effect of methanol on the self reaction of HO2 radicals (1988)
    New York, NY : Wiley-Blackwell
    International Journal of Chemical Kinetics 20 (1988), S. 283-295 
    Details
    ISSN: 0538-8066
    Keywords: Chemistry ; Physical Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The rate constant for the HO2 self reaction has been determined as a function of methanol vapor concentration at 278 K and 299 K. A molecular modulation technique was used in which HO2 radicals were photochemically produced in flowing gas mixtures comprised of Cl2, CH3OH, N2 and O2 with HO2 monitored in the UV at 220 nm. A positive linear dependence of the second order rate constant on methanol concentration was found and this effect increased with decreasing temperature. The rate constant for the HO2 self reaction can be described by \documentclass{article}\pagestyle{empty}\begin{document}$$k = 9.2 \cdot 10^{- 15} {\rm \,exp(1700/}T)\,+ \,2.1 \cdot 10^{- 34} {\rm \,exp(3000/}T)[{\rm CH}_{\rm 3} {\rm OH]cm}^{\rm 3}\, {\rm \,molecule}^{{\rm - 1}} {\rm \,s}^{{\rm - 1}}$$\end{document} in nitrogen at atmospheric pressure and in the methanol concentration range 1 · 1016 to 3 · 1017 molecules cm-3.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/kin.550200403
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  • 7
    Electronic Resource
    Electronic Resource
    Kinetics of the reaction Cl + HO2 = HCl + O2, using molecular modulation spectrometry (1980)
    New York, NY : Wiley-Blackwell
    International Journal of Chemical Kinetics 12 (1980), S. 649-660 
    Details
    ISSN: 0538-8066
    Keywords: Chemistry ; Physical Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The rate constant for the reaction (1), Cl + HO2 → HCl + O2, was measured using molecular modulation spectrometry to investigate HO2 radical kinetics in the modulated photolysis of Cl2—;H2—O2 mixtures at 760 torr pressure. HO2 was monitored directly in absorption at 220 nm, and k1 was determined from computer simulations of the observed kinetic behavior of HO2, using a simple chemical model. The results gave \documentclass{article}\pagestyle{empty}\begin{document}$$ k_1 /k_4 = 3.0_{ - 1.8}^{ + 5.1} \exp [+ (2120 \pm 370)/T] $$\end{document} where k4 is the rate constant for the reaction of Cl with H2. A consensus value of k4 gave k1 = 6.9 × 10-11 cm3/molecule sec, independent of temperature in the range of 274-338 K with an overall uncertainty of ±50%. The relative importance of reaction (1) for the conversion of Cl to HCl in the stratosphere is discussed briefly.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/kin.550120906
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  • 8
    Electronic Resource
    Electronic Resource
    Evaluated kinetic and photochemical data for atmospheric chemistry: Supplement III (1989)
    New York, NY : Wiley-Blackwell
    International Journal of Chemical Kinetics 21 (1989), S. 115-150 
    Details
    ISSN: 0538-8066
    Keywords: Chemistry ; Physical Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/kin.550210205
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