ELASTIC PROPERTIES OF BACTERIAL FLAGELLAR FILAMENTS .2. DETERMINATION OF THE MODULUS OF RIGIDITY
ELASTIC PROPERTIES OF BACTERIAL FLAGELLAR FILAMENTS .2. DETERMINATION OF THE MODULUS OF RIGIDITY
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DOI：
10.1016/0301-4622(85)80038-7
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发表时间：
1985-01-01
影响因子：
3.8
通讯作者：
KAMIYA, R
中科院分区：
文献类型：
--
作者：
HOSHIKAWA, H;KAMIYA, R
假设螺旋状细菌鞭毛的一端牢固地附着在基质上，计算了螺旋状细菌鞭毛在流体流动下的伸长。发现量[E（d/2 π. r）2 + 2 μ]可以通过测量在各种流速下的伸长率来确定，其中E是杨氏模量，μ。刚性模量，r是螺旋半径，d是螺距。进行实验以确定假定为闭合螺旋形式的沙门氏菌鞭毛丝的上述量。因为上述量几乎等于2 μ m。对于具有大的半径/节距比的螺旋形式，我们能够从伸长对流速的曲线图确定这种鞭毛丝的刚性模量。刚性模量测定为约1 × 10 - 4。1011达因/厘米2，即，比先前估计的值大2个数量级。
Elongation of a helical bacterial flagellar filament subjected to fluid flow was calculated on the assumption that one end of the filament is firmly attached to a substratum. It was found that the quantity [E (d/2 .pi. r)2 + 2 .mu.] could be determined by measuring the elongation at various flow rates, where E is Young''s modulus, .mu. the modulus of rigidity, r the radius of the helix and d the helical pitch. Experiments were carried out to determine the above quantity for Salmonella flagellar filaments assuming a close-coil form. Because the above quantity is almost equal to 2 .mu. for a helical form with large radius/pitch ratio, we were able to determine the modulus of rigidity for this kind of flagellar filament from plots of elongation vs. flow rates. The modulus of rigidity was determined to be about 1 .times. 1011 dyn/cm2, i.e., 2 orders of magnitude larger than the previously estimated value.