Distribution of bone crystallites in mineralized collagen fiber.

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  • 骨化膠原線維における骨結晶の分布について
  • 骨化膠原線維における骨結晶の分布について〔英文〕
  • コッカ コウゲン センイ ニ オケル コツ ケッショウ ノ ブンプ ニ ツイテ

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Characteristics of bone crystallites at the insertion of the distal phalanx of the horse in the stage of fibrous bone formation were investigated using electron microscopy. In this tissue, most of the collagen fibrils are ordered in the axial direction and crystallized. The longitudinal section of the collagen fibril showed periodic bands approximately 640/70A apart and with interperiod bands A1, A2, A3, B, C1, C2, D, E and F. In general, these crystallites seemed to adhere to the surface of the collagen fibrils and in the fibrils on the bone surface, needle-or plaque-shaped crystallites were oriented in the same axis as collagen fibrils and arranged on the cross bands. In the bone, many needle-shaped crystallites lay between the parallel collagen fibrils, and the crystallites infiltrated into the collagen fibrils where the interperiod bands are dense. These dense interperiod bands extended approximately 380-400A between two periodic bands 640-670A apart. Infiltration of the crystallites seemed to start at the fibril edge and spread reticulately into the interior. Lucent spots diameters of 50-80A were observed within the collagen fibrils. The crystallites filled the space (20-30A in width) between the spots.

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