In raw materials of dromedary hair, there are two distinct fibre populations： The fine one is of textile relevance and the coarse one is rather worthless and must be as a rule separated prior to spinning and subseque...In raw materials of dromedary hair, there are two distinct fibre populations： The fine one is of textile relevance and the coarse one is rather worthless and must be as a rule separated prior to spinning and subsequent processing. The fibre surface morphology and fibre fineness of Tunisian dromedary hair has been investigated by means of scanning electron microscope （SEM）. SEM microscopic method provides the fibre diameter, the scale shape, the scale frequency and scale height. The results show that dehaired dromedary fibre presents a relatively low mean fibre diameter （≈ 17 μm） with a high coefficient of variation （CV ≈ 25%）. The scales of the dromedary fibre are on average extremely long and quite visible, they tend not to protrude from the fibre, appear almost convex, and provide a wavy appearance in profile of the relatively coarse fibre. On counting the scale frequency, that is, the number of scale margins within a determined fibre length of 100 μm on the surface of a fine （diameter 〈 30 μm） and coarse （diameter 〉 30 μm） dromedary fibre, comes out roughly five at eight and eight at twelve scale margins, respectively. The mean height of the cuticle scale is 0.12μm and 0.24 μm, respectively, for fine and coarse dromedary fibre. These explain why dromedary fibres present a soft touch due to the prominence of the scale edges. This aspect of the surface structure has a high correlation with the felting capacity of the matter, and contributes to the concepts of handle and gloss.展开更多
The objective of this research was to evaluate the muscle growth of the Nile tilapias of Thai and supreme strain. Hyperplasia and hypertrophy of muscle fibers were studied by histology. The fish were cultivated in cag...The objective of this research was to evaluate the muscle growth of the Nile tilapias of Thai and supreme strain. Hyperplasia and hypertrophy of muscle fibers were studied by histology. The fish were cultivated in cages in a dam and as they grew they were weighed and measured in length. In tissue samples, it was evaluated the quantity of cells area~ and the diameter of the white, pink and red muscle fibers. The supreme strain presented greater number of white and pink fibers mm2 and smaller number of red fibers when compared to the Thai strain. 5-10 cm fish presented higher number of white, pink and red fibers mm： and smaller average diameter of the white and pink fibers, when compared to a 10-15 cm fish. The average diameter of the white and pink fibers increased in 10-15 cm fish, compared to 5-10 era. White fibers smaller than 10 ~tm were found only in the 5-10 cm supreme strain. Tilapias of Thai and supreme strain presented different standard distribution of red, pink and white muscle fibers. Supreme strain, genetically improved, presented higher hyperplasia of white fibers than Thai strain, and this can indicate its higher potential growth.展开更多
文摘In raw materials of dromedary hair, there are two distinct fibre populations： The fine one is of textile relevance and the coarse one is rather worthless and must be as a rule separated prior to spinning and subsequent processing. The fibre surface morphology and fibre fineness of Tunisian dromedary hair has been investigated by means of scanning electron microscope （SEM）. SEM microscopic method provides the fibre diameter, the scale shape, the scale frequency and scale height. The results show that dehaired dromedary fibre presents a relatively low mean fibre diameter （≈ 17 μm） with a high coefficient of variation （CV ≈ 25%）. The scales of the dromedary fibre are on average extremely long and quite visible, they tend not to protrude from the fibre, appear almost convex, and provide a wavy appearance in profile of the relatively coarse fibre. On counting the scale frequency, that is, the number of scale margins within a determined fibre length of 100 μm on the surface of a fine （diameter 〈 30 μm） and coarse （diameter 〉 30 μm） dromedary fibre, comes out roughly five at eight and eight at twelve scale margins, respectively. The mean height of the cuticle scale is 0.12μm and 0.24 μm, respectively, for fine and coarse dromedary fibre. These explain why dromedary fibres present a soft touch due to the prominence of the scale edges. This aspect of the surface structure has a high correlation with the felting capacity of the matter, and contributes to the concepts of handle and gloss.
文摘The objective of this research was to evaluate the muscle growth of the Nile tilapias of Thai and supreme strain. Hyperplasia and hypertrophy of muscle fibers were studied by histology. The fish were cultivated in cages in a dam and as they grew they were weighed and measured in length. In tissue samples, it was evaluated the quantity of cells area~ and the diameter of the white, pink and red muscle fibers. The supreme strain presented greater number of white and pink fibers mm2 and smaller number of red fibers when compared to the Thai strain. 5-10 cm fish presented higher number of white, pink and red fibers mm： and smaller average diameter of the white and pink fibers, when compared to a 10-15 cm fish. The average diameter of the white and pink fibers increased in 10-15 cm fish, compared to 5-10 era. White fibers smaller than 10 ~tm were found only in the 5-10 cm supreme strain. Tilapias of Thai and supreme strain presented different standard distribution of red, pink and white muscle fibers. Supreme strain, genetically improved, presented higher hyperplasia of white fibers than Thai strain, and this can indicate its higher potential growth.
