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July 31, 2018
Image: I have been trying to homogenize heart tissue in the Bel-Art Mini Liquid Nitrogen Cooled Mini-Mortar set

Homogenizing Frozen Samples Efficiently

Dear Lab Guy, I have been trying to homogenize heart tissue in the Bel-Art Mini Liquid Nitrogen Cooled Mini-Mortar set (H37260-0100) The pestle did not reach the bottom of the tube and the tissue got stuck at the bottom, so I did not achieve the desired result. I used regular 1.5ml Eppendorf tubes. Could you please advise me on what can be done about it? Thanks. - Olga M.
July 19, 2018
Image: Reusable / Disposable Desiccator Cartridges in Polystyrene Slide Boxes - Ask Lab Guy - SP Scienceware

Low Humidity Storage for Microscope Slides

Hi Lab Guy, Our customer needs to seal in a desiccator, slides with samples that needs to be transported. We would like to know the best way to do this and if you have a small desiccator with a sort of "rack" for slides. Thank you for your help. - Anna C.
July 12, 2018
Image: Bel-Art Poly-Hand 5 Gal. Carboy Polyethylene Pump - SP Scienceware - Ask Lab Guy

Pumping an Acidic Solution

Dear Lab Guy, I am trying to set up a recirculating system for an acid bath for etching zinc plates for a traditional printmaking process. We are using approximately 4.5 gallons of water and 0.5 gallons of concentrated nitric acid, so it seemed like your hand pump H32787-0000 and 5-gallon carboy F10795-0000 might be a good starting point. Approximately what volume is delivered per stroke at a low head like a foot or two? Alternatively, how many strokes to empty? Also, would it be acceptable to leave the pump in the acid indefinitely? Thank you for your assistance. - Walt P.
July 6, 2018
Image: Buchner Table-Top Funnels - SP Scienceware - Ask Lab Guy

Gravity or Vacuum Filtration for Buchner Tabletop Funnels

Dear Lab Guy, I have a question regarding the table-top Polyethylene Buchner Table-Top Funnel. Are those meant to be used for vacuum filtration or gravity filtration? If it's for vacuum, do you have a recommendation on the pump, hose (and/or a separate water container?) set up that can work with that funnel. Thanks! Li Y.
June 28, 2018
Image: Vaccuu-Pette/96 - SP Scienceware

Vaccu-Pette Not Sealing Well After Autoclaving

Dear Lab Guy, My customer is using the Reusable Autoclavable Vaccu-Pette 96 Tip Pi catalog no. 37876-0001 and has trouble getting a good seal after autoclaving this device. Do you have any tips for autoclaving? Margot S