Blood collection tubes must be drawn in a specific order to avoid cross-contamination of additives between tubes. The recommended order of draw for plastic vacutainer tubes is: 1  First-blood culture bottle or tube (yellow or yellow-black top). 2  Second-coagulation tube (light blue top). 3  Third-non-additive tube (red top).
A thermocouple produces a voltage when the temperature of one of the contact points differs from the temperature of another, in a process known as the thermoelectric effect.he wires that make up the thermocouple must be insulated from each other everywhere, except at the sensing junction. Any additional electrical contact between the wires, or contact of a wire to other conductive objects, can modify the voltage and give a false reading of temperature.
I hear you say. For the uninitiated, a Thermomix is an all-singing, all-dancing lean, mean cooking machine. Itâs almost like all your kitchen appliances rolled into one. Almost. It weighs, chops, mixes, blends, mills, beats, minces, stirs, melts, cooks and steams.he cons. 1  You canât set it to come on at a certain time, or cook for a long time, in the same way that a slow cooker does. 2  A Thermomix does not slice. 3  For example, like onions in a food processor (but it does chop!). 4  It does take a bit of time and experimentation to get used to.