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Volume 8 (1981)
- Issue 4 Pages 131-
- Issue 3 Pages 91-
- Issue 2 Pages 47-
- Issue 1 Pages 2-
Volume 8, Issue 3
Displaying 1-8 of 8 articles from this issue
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Kazuhiko Fujioka, Kuniyasu Nakajima, Yoshihiro Baba, Akihiro Kagemoto, ...1981 Volume 8 Issue 3 Pages 91-94
Published: July 05, 1981
Released on J-STAGE: September 07, 2009
JOURNAL FREE ACCESSHeats of dilution of aqueous hemoglobin solutions were measured using a flow microcalorimeter at 298.15±0.001K. Thermodynamic quantities for the association-dissociation equilibrium of hemoglobin molecules were derived. In order to obtain values of the heats of dissociation ΔH and the dissociation constant K the treatment of data according to Eq. (5) was carried out using two different methods. In the first method ΔH value is estimated using the dissociation constant K as a reciprocal of the association constant previously determined by osmometry. In the second one the K and ΔH values are treated as adaptable parameters. The two sets of K and ΔH values so estimated are of comparable order. Furthermore, thermodynamic quantities for the association process of hemoglobin molecules were estimated and proved to be reasonable, compared with those reported by other investigators.View full abstractDownload PDF (391K) -
Sachio Tanabe, Ryohei Otsuka1981 Volume 8 Issue 3 Pages 95-101
Published: July 05, 1981
Released on J-STAGE: September 07, 2009
JOURNAL FREE ACCESSTypical integral and differential methods for the kinetic analysis of solid state reactions by thermal analysis have been examined based on the results obtained theoretically from assumed conditions (kinetic equation, parameters, etc.), giving the following results.
(1) The integral method (ln[g(α)] vs. 1/T plots) will be inapplicable to the analysis of the reaction, of which mechanism may be altered in the course of the reaction process, or of which beginning temperature can not be evidently regarded as 0K, as in the case of the decomposition reaction under self-generating gas.
(2) In order to determine the kinetic equation and parameters of the reaction uniquely, it is necessary to analyze multiple data obtained under such conditions as the reaction proceeds at different temperature ranges, i. e. under different heating rates or different particle sizes.
(3) The above results indicate that the application of the differential method (ln[(dα/dT)/f(α)] vs. 1/T plots) under different heating rates will be recommended.View full abstractDownload PDF (680K) -
Shigeyuki Tanaka, Kozo Tada, Yoshihiro Baba, Akihiro Kagemoto, Ryoichi ...1981 Volume 8 Issue 3 Pages 102-105
Published: July 05, 1981
Released on J-STAGE: September 07, 2009
JOURNAL FREE ACCESSThe influence of pH on an equimolar mixture of poly (A) and poly (U) in 0.1mol dm-3 acetate buffer solution was studied by means of heat of mixing and CD spectra.
The heat of mixing, ΔHM, in the region where pH is less than 5.5 is nearly zero, suggesting that in acidic solution an equimolar mixture of poly (A) and poly (U) may be due to result in the interaction between poly (A)·poly (A) duplex and poly (U) as pointed out by CD spectral measurement.
On the other hand, in less acidic solution where pH is more than 5.5 an equimolar mixture of poly (A) and poly (U) leads to poly (A)·poly (U) duplex formed by the interaction between poly (A) and poly (U) and its enthalpy change is estimated to be about -17.6±2.1kJ per mole of base pair of nucleotide.
Calorimetric studies of acidic and less acidic solutions seem to reflect exactly the results of the CD spectral measurements.View full abstractDownload PDF (457K) -
Edgar F. Westrum Jr.1981 Volume 8 Issue 3 Pages 106-114
Published: July 05, 1981
Released on J-STAGE: September 07, 2009
JOURNAL FREE ACCESSResolution of excess heat capacities of many types of transitions-whether structural or electronic, or otherwise-requires a reliable estimate of the lattice contribution. This besetting problem has confronted thermophysicists for decades. Corresponding state theories have been less than satisfactory; Lindemann schemes are suggestive. For chemical thermodynamic purposes use of a volume-weighted scheme over the range where entropy development largely occurs is demonstrated to provide resolution of Schottky contributions for Ln (OH)3 and LnCl3 systems and has been shown to be superior to other approaches. Application to estimation of heat capacities (entropies, etc.) and to extrapolation of results to pure end-member composition in geothermodynamic problems are considered.View full abstractDownload PDF (1088K) -
(2) Thermal conductivity·thermal diffusivity (Part 1)Masayuki Kamimoto, Katsuhiko Kanari, Yoichi Takahashi1981 Volume 8 Issue 3 Pages 115-122
Published: July 05, 1981
Released on J-STAGE: September 07, 2009
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K. Nakanishi1981 Volume 8 Issue 3 Pages 123-125
Published: July 05, 1981
Released on J-STAGE: September 07, 2009
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[in Japanese]1981 Volume 8 Issue 3 Pages 126
Published: July 05, 1981
Released on J-STAGE: September 07, 2009
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N. Fuji1981 Volume 8 Issue 3 Pages 127-128
Published: July 05, 1981
Released on J-STAGE: September 07, 2009
JOURNAL FREE ACCESSDownload PDF (192K)
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