The decomposition reaction of hydrogen peroxide was carried out by using Fe(II1)-3,4,3 ',4',3 ",4'~,3"',4"'-octacarboxyphthalocyanine (Fe(II1)-oaPc) as a catalyst, which has previously been reported by Boston et al. Fe(II1)-oaPc is a remarkably effective catalyst for the reaction, compared with hemin, other metal-phthalocyanine compounds, or other iron complexes such as [Fe(III)-(bipy),]X,. The kinetics of this reaction was also investigated in the pH range 5 3 -10,5 by measuring the initial velocity, V,, of the increasing concentration of 0, using a Warburg respirometer. The reaction proceeds according the catalase-like mechanism. On the basis of the results of Sigel et al., the reaction mechanism is discussed.

Keyword phrasesnew chemiluminescence labeling of polyunsaturated fatty acids; 6-[N-(4-aminobutyl)methylamino]-2,3-dihydro-1,4-phthalazinedione as a labeling reagent; HPLC.

Fracture energy is one of important parameters in estimating the resistance of crack propagation for refractories. However, the effect of the dimension of a test specimen on the fracture energy has not been sufficiently studied. In the present study, effective fracture energy γ eff of chamotte refractory was evaluated using WOF (work of fracture) technique, in order to investigate the relationship between the fracture energy and specimen dimension. The γ eff was significantly dependent on specimen dimension and notch length. Larger specimen dimension and shorter relative notch length made the γ eff increased. For instance, the γ eff of the large specimen was approximately three times as large as that of the small specimen. To evaluate accurate γ eff for the refractory, a specimen with ligament longer than a given length was required. The ligament length was discussed in relation to the size of a frontal process zone.

The first synthesis and the physical properties of diphenoquinonophanes is reported along with their spectral evidences.

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