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《Journal of Northeast Forestry University》 2011-04
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Measurement of Growth and Other Growth Related Characters of White Hairs from Both Temples of an Adult Man

Liu Yu,Zhang Wei(School of Wildlife Resources,Northeast Forestry University,Harbin 150040,P.R.China)  
Twelve samples with 5-7 growing white hairs each were obtained respectively from each side of temples of an adult man during 985 days.The lengths of the white segments of each sample were measured by ruler,and the microcosmic structure of the hair segments 1 cm away from their hairy root was studied.The analysis of paired-samples T test and Bivariate correlation with SPSS17.0 software were made.An insignificant difference in hair growth rate was observed between the left temple and the right temple.The average rate of the white hair growth for the left temple is(0.59±0.05)mm/d and that for the right is(0.58±0.06)mm/d.The average diameter of hair segments 1 cm away from their hairy root is(92.52±6.34)μm for the left temple and that for the right is(91.18±4.47)μm.There is an extremely significant difference in hair medullar diameter between the left and the right temples.The average medullar diameter is(28.44±9.25)μm for the left temple and(21.59±3.69)μm for the right.The average medullar index is(30.41±8.26) percent for the left temple and(23.59±4.21) percent for the right.The mean distance from scale margins is(5.00±0.37)μm for the left temple and(4.78±0.16)μm for the right.The hair growth rate,diameter of hair segments 1 cm away from their hairy root,and mean distance of scale margins are all bilateral symmetry.There is a seasonal change in hair growth for both sides of temples.And there are correlations between the characters.
【CateGory Index】: R751
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