---+ Measuring Adsorption Rate of T7 Phage ---++ Reagents / Materials: * <strong>*Fresh*</strong> phage lysate (no more than <strong>*one day*</strong> old) * see [[ProtocolPhageLysate][Preparing Phage Lysates]] for protocol * Overnight stock of permissive bacterial host * Make sure to grow in presence of 250uM nsAA if using nsAA-RS strains * [[stub][LB Media w/ appropriate supplements and antibiotics]] * 250mL flasks * <strong style="background-color: transparent">*For plating phages:*</strong> * LB Plates with w/ appropriate supplements and antibiotics * LB Top Agar (LB + 0.8% Agar) * Test tubes * 55C Water bath or heat block * 37C Incubator ---++ Procedure: 1 Add 1mL of an overnight culture of the E. coli host to 10mL of LB (+antibiotics,nsAA if needed) in a 250mL flask 1 Allow to grow for 1h @ 37C, 200RPM until culture density is 1-2e8 cells / mL (OD ~ 0.2) 1 Add 1e6 phages (from fresh lysate) and incubate 5min without shaking at 37C 1 Remove 2 1mL aliquots, centrifuge one sample to pellet adsorbed phage (4000g, 1min, RT) and let the other sit at RT 1 Plate dilutions of supernatant from pelleted sample (unadsorbed phage) and the non-centrifuged sample (total phage) * plate 10uL of each dilution as described in [[stub][Determining Phage Titers]] 1 Calculate N<sub>total</sub> and N<sub>free</sub> from plate counts, by rate equation N<sub>free</sub> = N<sub>tot</sub> e<sup>-5a</sup>; Adsorption rate a = ln(N<sub>tot</sub>/N<sub>free</sub>)/5 ---++ References: [1] Heineman, Richard H, and James J Bull. "Testing Optimality with Experimental Evolution: Lysis Time in a Bacteriophage."<em style="background-color: transparent; font-family: 'Trebuchet MS'; font-size: 12px; text-indent: -20px"> Evolution </em>61, no. 7 (2007): doi:10.1111/j.1558-5646.2007.00132.x. -- Main.ColinBrown - 14 Jun 2017
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Topic revision: r3 - 2018-06-07 - ColinBrown