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amisking(½ð±Ò+1):good£¡ 2010-05-07 08:23:52
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2Â¥2010-05-07 02:26:12
jasco
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3Â¥2010-05-07 07:40:34
liyong1981
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4Â¥2010-05-07 09:25:03
nigel.lin
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5Â¥2010-05-08 00:01:07
nigel.lin
Òø³æ (³õÈëÎÄ̳)
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plantaqp(½ð±Ò+5):»¶Ó¶àÀ´½»Á÷ 2010-05-08 04:02:35
plantaqp(½ð±Ò+5):»¶Ó¶àÀ´½»Á÷ 2010-05-08 04:02:35
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1. Afresh overnight culture ofbacteria is diluted 1:100 into prewarmed LB broth and the cells are incubated at 370C with shaking (225 rpm) to an OD600 of 0.3-0.4. 2. An equal volume of ice-cold 2x TSS is added and the cell suspension is mixed gently. [TSS is LB broth with 10% PEG (molecular weight 3350 or 8000), 5% DMSO, and 20-50 mM Mg2+ (MgSO4 or MgCl2) at a final pH of 6.5.] 3a. For long-term storage, cells are frozen immediately in a dry ice/ethanol bath and stored at -70¡ãC. 3b. For transformation, a 0.1-ml aliquot of cells is pipetted into a cold polypropylene tube containing 1 ,ul (100 pg) of plasmid DNA, and the cell/DNA suspension is mixed gently. (When frozen cells are used, cells are thawed slowly on ice and used immediately.) 4. The cell/DNA mixture is incubated for 5-60 min at 4¡ãC. 5. A 0.9-ml aliquot of TSS (or LB broth) plus 20 mM glucose is added, and the cells are incubated at 37¡ãC with shaking (225 rpm) for 1 hr to allow expression of the antibiotic-resistance gene. 6. Transformants are selected by standard methods. |
6Â¥2010-05-08 00:08:53













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