FBS (Sigma) was added to the tissue followed by centrifugation at 1000 x g for 5 min at 4 °C. (neuronalsignaling.org)
Spheroids were resuspended in 1 ml EC basal medium and collected by centrifugation at 200g for 5 min. (nature.com)
For years, I evaluated and diagnosed pets with in - house fecal flotation with centrifugation but always saw variability in my test results, misdiagnosis of parasites, and false negative results. (idexx.com)