A digital fourier harmonic superposition method for the structural analysis of human tooth enamel obtained by electron microscopy

Kanaya, K.; Baba, Norio; Shinohara, Chiharu; Ichijo, Takashi

doi:10.1016/0739-6260(84)90028-5

Cited by 19 publications

(5 citation statements)

References 16 publications

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“…The diffractionspots consist of a phase band with the various shifted phases that were previously demonstrated experimentally (Kanaya et al, 1983(Kanaya et al, ,1984.…”

Section: B H K : Amentioning

confidence: 53%

“…It has been shown that the crystalloid in the microbody of Kloeckera constitutes a cubic structure; a = 22 nm, by the interpenetration of the two face-centered lattices, which is composed of a large alcohol oxidase with eight subunits, 5.5-nm in diameter, and a small catalase with four elongated globular subunits each 7.8 nm long and 5.2 nm wide, two of which are paired and stacked at right angles. (Kanaya et al, 1984) Digital processing was applied to human tooth enamel, which was found to be composed of hydroxyapatite [Calo(P0&(OH)2]. hd Fig.…”

Section: Examples Of Digital Structural Analysis Of Biological Specimensmentioning

confidence: 99%

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Section IV: Digital processing methods for structural analysis in high resolution electron microscopy

Kanaya

Baba

Naka

1986

J. Elec. Microsc. Tech.

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“…The diffractionspots consist of a phase band with the various shifted phases that were previously demonstrated experimentally (Kanaya et al, 1983(Kanaya et al, ,1984.…”

Section: B H K : Amentioning

confidence: 53%

Section: Examples Of Digital Structural Analysis Of Biological Specimensmentioning

confidence: 99%

Section IV: Digital processing methods for structural analysis in high resolution electron microscopy

Kanaya

Baba

Naka

1986

J. Elec. Microsc. Tech.

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“…Theoretical studies of the morphology of hydroxyapatite,16, 17 octacalcium phosphate (OCP),18 and the influence of Mg 2+ and Li + ion additives on the morphology of CaCO 3 crystals based on the calculation of surface energy per unit area for given planes19 have been performed, but no experimental study of the surface structures of biominerals and their relationship to proteins has yet been performed, as far as the authors are aware. High‐resolution electron microscopy (HREM) has been used for studying the bulk and defect structure of human tooth enamel crystals 20–24. Lately, octocalcium phosphate layers were detected inside human dentine crystals 25.…”

Section: Introductionmentioning

confidence: 99%

Surface structure study of biological calcium phosphate apatite crystals from human tooth enamel

Brès¹,

Hutchison²

2002

J. Biomed. Mater. Res.

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A surface-structure study of human tooth enamel crystals has been carried out by high-resolution electron microscopy (HREM). The surfaces of several crystals have been examined and the surfaces of a single crystal are described here. The observations made on this crystal are similar to the observations made on the other crystals, although the difference of morphology in the crystals observed indicates that the growth control by matrix proteins takes only place on the [011 macro 0] surfaces of the crystals. The crystal described here is oriented along the [112 macro 0] direction, and the following surfaces have been analyzed: (11 macro 00), (011 macro 1), (01 macro 11) and (0001). A subsurface reconstruction is observed just below the surface of the crystal not bonded to the matrix and lying above the supporting film. Observation of the matrix surrounding the crystal shows the existence of poorly crystalline phases with a structure close to that of hydroxyapatite (OHAP). Finally, a comparison of the images of the (011 macro 0) surface with computer-simulated images calculated for several models of the OHAP surface structure shows that the surface itself is stoichiometric and contains both calcium and phosphate groups. The knowledge of the binding sites of proteins on biomineral crystals such as the ones found in human tooth enamel is of prime importance for the understanding of their growth process. In this study, the first structure determination of the surface of human tooth enamel crystals is presented.

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“…For a case of periodic objects, the filtering method, masking all Fourier spectra except those lying on certain spectrum regions such as diffraction spots and layer lines, etc. (see DeRosier and Klug, 1968;Frank, 1973;Hawkes, 1980;Baumeister and Vogell, 1981;Kanaya et al, 1982aKanaya et al, ,b, 1983Kanaya et al, , 1984, is useful, and it results in a considerable improvement of the signalto-noise ratio. The photographic superposition technique (Markham method), or the periodic signal averaging method (Kirkland et al, 19811, is also effective, and it may be further utilized for a case of objects with rotational symmetries (Crewe and Ohtsuki, 1982).…”

Section: Introductionmentioning

confidence: 99%

A method of noise removal using the inverse transform of an image autocorrelation function

Baba

Oho

Kanaya

1985

J. Elec. Microsc. Tech.

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A method for a reversible transform between an image and image autocorrelation function has been devised, and it has been applied to the reduction of random noise in a microscope image. Object‐related features of an image signal as well as noise features are overlapped at the vicinity of the origin of an image autocorrelation, and a peak is formed at this position. The present method removes the noise contribution in this peak and returns the autocorrelation function, thus corrected, to the image. An autocorrelation function is computed by two Fourier transforms as based on the convolution theorem. The inverse transform from the image autocorrelation function is made possible by performing two Fourier transforms in reverse to the above. This method has been developed to remove random noise more accurately from a single image (especially for nonperiodic images) than other image‐processing methods such as smoothing techniques and low pass filtering.

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A digital fourier harmonic superposition method for the structural analysis of human tooth enamel obtained by electron microscopy

Cited by 19 publications

References 16 publications

Section IV: Digital processing methods for structural analysis in high resolution electron microscopy

Section IV: Digital processing methods for structural analysis in high resolution electron microscopy

Surface structure study of biological calcium phosphate apatite crystals from human tooth enamel

A method of noise removal using the inverse transform of an image autocorrelation function

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