September
14
Soil Washing and Metadata 9/10/2018
Rationale: wash a new soil sample to get new direct and enriched isolations. In addition, prepare the soil for analysis to get soil metadata.
Soil Washing:
- Filled 15 mL conical tube with ~2mL of soil
- Added LB the 12 mL mark of the tube
- Started 10 minutes of shaking and vortex-ing
- the tube started leaking so I tried to switch the mixture into another tube but then I switched it back when not all of the soil came out of the original tube. I ended up losing ~1mL of my LB and soil mixture
- After shaking I weighed the tube and got 19.83 g
- The tubes were centrifuged as a class
- I used a syringe and filter to filter the supernatant of the centrifuges mixture into a new 15 mL tube
- I used aseptic technique, and consistently washed the tip of the filter with 70% ethanol
- I lost a lot of solution to the table trying to get the last of the supernatant into the syringe
- I ended up getting ~7 mL for my enriched isolation and ~0.75 mL for my direct isolation, both in 15 mL conical tubes
- I added 0.5 mL of arthro to my enriched isolation and left it to incubate for 48 hours at 28 °C
Soil Metadata:
- Filled a falcon tube with ~4 mL soil
- Added DI water to the 12 mL mark of the tube
- Added 3 drops of soil dispersion
- shook tube with glove over the opening for 30 seconds
- poured supernatant into 50 mL conical tube and let both tubes sit under the hood for 48 hours
- measured the mass of wet soil sample in a weigh boat
- mass of weigh boat = 2.37g
- mas of wet soil = 4.62 g
- Took the pH of soil sample
- added pinch of soil to pH tube
- filled tube with DI
- shook for 10 seconds
- let sit for 2 min
- put 1 in long pH paper into tube for 45 sec
- dropped first paper into sample so had to use a new one
- pH = 6.5
Next Steps: Perform a spot test to check for phages and continue analyzing soil metadata.