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Post-Regionals

Journal

• Defining Objectives
• Techniques Workshop
• Bioinformatics & qRT-PCR
• Sensory Element Fishing
• Electrochem - CPR Oxidation
• Electrochem - Reporter Gene
• Pseudomonas Tools
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• NA Viability Assays
• May - July Group Journal

Protocols

Safety

This protocol is used to prepare f2media for algae growth

Procedure

1. Add 0.5 mL of each of stock solutions 1-5 (listed below) to 1 L of seawater
2. Split into flasks and autoclave at 121 °C (15 PSI) for 15 minutes
3. Prepare phosphate solution (see below) and autoclave dilute phosphate stock at 121°C (15PSI, 15 mins). After cooling, dispense aseptically with sterilised automatic dispenser. This component is autoclaved separately in order to prevent precipitation

Stock solutions

1. NaNO3 (150.0 g/L)
2. Trace metals (mixed to 750 mL to dissolve, and then brought up to 1 L): CuSO4.5H2O (19.6 mg/L), ZnSO4.7H2O (44.0 mg/L), CoCl2.6H2O (22.0 mg/L), MnCl2.4H2O (360.0 mg/L), Na2MoO4.2H2O (12.6 mg/L)
3. Na2SiO3.5H2O (22.7 g/L)
4. Fe citrate (both constituents added to the same 1 L: ferric citrate (9.0g/L), Citric acid (9.0g/L)
5. Vitamins .
6. NaH2PO4.2H2O (11.3 g/L)

Further purification (Plasmid from putida)

1. Layer the resuspended DNA on a 2.5mL bed of saturated CsCl in a polymer tube. Centrifuge for 14hr at 14 000 rpm in a fixed-angle 30 rotor at 2°C. After the run, ~25mL of liquid can be discarded from the top without disturbing the remainder. Mix the lower part to form the concentrated lysate.
2. Slowly dissolve ~5.7g CsCl to the concentrated lysate, until the refractive index is 1.399. Mix solution with Syber-safe or gel-red. Centrifuge for 40hr in a Spinco fixed-angle rotor 50 at 105 000 x g at 12°C. After this run, 2 well-separated bands should be able to be seen. Alternatively, do only this spin where DNA mixed with CsCl is concentrated to a refractive index of 1.399 with the fluorescent DNA stain.
3. Because the DNA was infused with dye, 2 well-separated bands will appear. The upper band is linear and non-circular DNA (junk). The lower band is the plasmid of interest. Remove the upper layer with a micropipette. After it is removed, pool bands from several tubes centrifuge again SW50.1 rotor for 20h at 40 000rpm. Again there will be 2 bands and the lower band is the desired intact plasmid.