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The larger diameter of the head tube and headset gives added stiffness to the steering portion of the bicycle. Common sizes. 25.4 mm (1 in) steerer tube, this may have a fork crown (the base of the fork steerer tube) of a number of different dimensions, and milling may be necessary to make some headsets fit. 26.4 mm crown race (ISO standard)
Crude versions of conically tapered ground glass joints have been made for quite a while, [1] particularly for stoppers for glass bottles and retorts. [2] Crude glass joints could still be made to seal well by grinding the two parts of a joint against each other using an abrasive grit, but this led to variations between joints and they would not seal well if mated to a different joint.
5-125B/4E27A – 75 MHz, 125 W Glass power pentode; 5-500A – 500 W Glass radial-beam pentode; 5CX1500A – 110 MHz, 1.5 kW Ceramic radial-beam pentode, forced air cooled; 5CX3000A – 150 MHz, 4.0 kW Ceramic radial-beam pentode, forced air cooled; 5K70SH – 30 kW S-band Klystron
These tubes are commonly sealed with a rubber stopper and often have a specific additive placed in the tube with the stopper color indicating the additive. For example, a blue-top tube is a 5 ml test tube containing sodium citrate as an anticoagulant, used to collect blood for coagulation and glucose-6-phosphate dehydrogenase testing. [5]
These tubes should be used with care when measuring drug or hormone levels because the drug or hormone may diffuse from the serum into the gel, causing a reduction in measured level. The gel in SST II tubes (which appears slightly less opaque) is supposed [weasel words] to have less effect on drug levels in serum. [citation needed]
Bravo — The reality-heavy TV network adds more unscripted drama, each having a tenuous cast connection with the show mentioned before it, among them The Moroccans of Mulholland Drive (centered on a Morocco-born dentist with a celebrity client list), A Coppola Coconuts (featuring two granddaughters of Francis Ford Coppola), and the self ...