1. However QBF-41 offers a sample tube of shaving cream free of charge. 2. Errors due to inefficient packing in the sample tube are difficult to eliminate. 3. One of the sampling tubes was located at the worst-case location within the aspiration lumen. 4. Crystal-clear cerebrospinal fluid dripped into the sample tubes . 5. Groundwater has been investigated from 15 observation and sample tubes and landfill gas in 20 separate points. 6. For each measurement, only around 250 mg of sample is required ( 50 mg can be used for a thin-bore sample tube ). 7. Where V _ { s } is the particle's settling velocity, d is the sampling tubes inner diameter, and g is the acceleration of gravity. 8. To a sealed chamber, the researchers connected air sampling tubes and an atomizer which could create a fine spray from cultures of bacteria in liquid. 9. With the vacuum tube system, the needle pierces the top of the sample tube and will potentially come into contact with the additives in the tube. 10. In the apparatus a fixed volume of sample oil is directly drawn from a sample tube into a degassing vessel under vacuum, where the gases are released. 
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