Glass beads, acid-washed
Cat No:SG8772
Store at Room Temperature
直径：425-600 μm (30-40 U.S. sieve)
Product Description
Density: 2.5 g/ml
Refractive index: 1.51-1.52
Compressive strength (psi average): 36,000
Poisson’s Ratio (psi): 0.21
Rigidity Modulus (psi): 4.3 x 106
Young’s Modulus (psi): 10 x 106
Hardness (Knoop 100 g load): 515 kg/mm2
Coefficient of friction (static): 0.9-1.0
Chemical composition: soda-lime silica glass
Softening point (dilatometer): 589 °C
Expansion Coefficient (25-300 °C): 85 x 107 per °C
Strain point: 505 °C
Annealing point: 548 °C
Dielectric Constant: 1 Kc 7.6 D.C.
Volume Resistivity (Ohm-cm): 25 °C 6.5 x 1012
Lost tangent: 1 Kc 2.0% 100 Kc 1.0%.
A bead size of 0.5 mm is recommended for use in breaking open yeast cells. A protocol for the use of 0.45 to 0.55 mm acid-washed glass beads from Sigma for cell disruption of yeast cells has been published.
货号：SG8772
10g 160元
100g 1500元
References
1. Ausbel, F. M., et al., Short Protocols in Molecular Biology, Greene Pub. Associates and Wiley-Interscience (N. Y. 1995), 3rd ed., 13-51.
2. Jazwinski, S. M., Preparation of Extracts from Yeast. Methods in Enzymology, 182, 163 (1990).
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