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Fujiwara, Toshikatsu

doi:10.2330/joralbiosci1965.24.393

Cited by 5 publications

(2 citation statements)

References 26 publications

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“…The accuracy of the DLS system used was checked by measuring the particle sizes of α-cyclodextrin, dehydrocholic acid sodium salt, and tris(hydroxymethyl)aminomethane. The observed values were 1.4 nm for α-cyclodextrin, 1.2 nm for dehydrocholic acid sodium salt, and 0.5 nm for tris(hydroxymethyl)aminomethane, which showed good agreement with the theoretical values of 1.46 nm × 0.8 nm, 1.2 nm (Murata, Y., personal communication), and 0.49 nm × 0.62 nm, respectively. Therefore, this DLS system is sufficiently accurate to measure particle size ranging from 0.5 to 1.4 nm.…”

Section: Methodssupporting

confidence: 78%

Clustering of Calcium Phosphate in the System CaCl₂−H₃PO₄−KCl−H₂O

1999

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The stability of calcium phosphate clusters approximately 0.8 nm in diameter, which were found in a simulated body fluid in a previous work, was investigated in the system CaCl 2 -H 3 PO 4 -KCl-H 2 O using an intensityenhanced dynamic light-scattering technique at 25 °C. It was shown that tris(hydroxymethyl)aminomethane, which was used as a buffer in the previous study, had no effect on the formation of the clusters. The amount of clusters decreased with decreasing supersaturation of the solution with respect to hydroxyapatite. Under constant supersaturation with respect to hydroxyapatite, the amount of the clusters reached a maximum in solutions with Ca/P molar ratios ranging from 1 to 8.

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Section: Methodssupporting

confidence: 78%

Clustering of Calcium Phosphate in the System CaCl₂−H₃PO₄−KCl−H₂O

1999

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“…For an accuracy check of the present dynamic light scattering system, molecular sizes of α-cyclodextrin and dehydrocholic acid sodium salt in solutions were measured as the size references. The former is toric in molecular shape in an aqueous solution and 1.46 × 0.8 nm in size . The latter forms a stable dimmer of 1.2 nm in diameter (Murata, Y., personal communication).…”

Section: Resultsmentioning

confidence: 99%

Cluster Growth Model for Hydroxyapatite

1998

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An intensity-enhanced dynamic light scattering technique revealed the presence of calcium phosphate clusters from 0.7 to 1.0 nm in size in a simulated body fluid. The clusters were also present in fluids undersaturated with respect to octacalcium and amorphous calcium phosphates and supersaturated with respect only to hydroxyapatite. These clusters are the growth unit of hydroxyapatite judging from the fact that hydroxyapatite grows by step flow 0.8 or 1.6 nm in height and that the probability of incorporation of the growth unit into the crystal is extremely low, as revealed previously. We propose a cluster growth model where hydroxyapatite grows by selective hexagonal packing of left-and right-handed chiral Ca 9 -(PO 4 ) 6 clusters 0.8 nm in size. Theoretically, stacking faults of clusters create a reflectiontwin crystal, edge dislocations with a Burgers vector of C/2 and screw dislocations. An example of the reflection-twin is the merohedry twin which is frequently found in cadmium chlorapatite. An atomic image corresponding to the edge dislocations with a Burgers vector of C/2 was actually obtained on the surface of synthetic single-crystal hydroxyapatite.

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