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Ask Lab Guy:

  • For advice on SP lab equipment, supplies, etc.
  • How to make something work - products, processes, applications
  • Where to find resources on a scientific topic or process

June 12, 2018

Tube Compatibility for use with Fungal DNA extraction

Dear Lab Guy - Our lab bought your product CAT No. 650000002 (1.5 mL pestle). We will use it for fungal DNA extraction. We need a Micro-centrifuge tube compatible with this pestle (tip of the pestle must accurately fit with the bottom of the tube). Do you have any product like this? - Afjalus
June 11, 2018

Looking for an Easier Solution to Difficult Liquid Sampling

Dear Lab Guy, I am looking for a system that can take a sample dripping from a rod that has been dipped into a reactor and not expose the operator to the dangerous solvent in the media. Now the samples are taken by lifting the rod in a ventilated tube with a hole in the side and a 25ml glass bottle is inserted by hand and filled only to a very small part. The bottle gets product on the outside and the ventilation is not enough to protect the operator. If you have an idea for taking a sample, without introducing shear forces on the media, since its a suspension for making gel, I would be very grateful. My idea right now would require a small (1-2cm2) sample scoop that could be inserted under the lifted sample rod and then enclosed in the same type of bottle that is used today, eliminating the spill on the outside. Kind regards - David E
May 24, 2018
Image: Desiccators – How to Choose

Achieving a 100% Humidity Free Environment: Vacuum and Gas-Purge Desiccation

Dear Lab Guy, I’m using a desiccator cabinet with plenty of desiccant, but it doesn't seem to produce a dry enough environment for my use. How can I achieve a lower relative humidity? Sincerely, George G.
May 14, 2018
Image: Immersion Lines

What is the Difference Between Partial Immersion and Total Immersion?

Dear Lab Guy, I’m trying to buy a thermometer and I see reference to partial immersion and total immersion. I have no idea what that means! For total immersion do you need to completely immerse the thermometer? How far do you have to immerse a partial immersion thermometer? Sincerely, Dominick