Insert rack

The insert rack is designed for easy installation and removal through an unused nozzle. The supporting rods (one for each specimen) are welded to a single support plate that is of a width that enables it to be introduced through the nozzle. However, this too cannot be inserted unless the equipment is out of service, although its introduction does not require removal of gas. 

Pretreat slides with Triton X-100 to increase permeability of tissue sections Place slides in a rack and insert rack in PBS containing 0.2% Triton X-100. Incubate for 20 min at room temperature. 

Always wear gloves and safety glasses or a face shield when removing or inserting racks, checking liquid level, or filling the freezers with liquid nitrogen. 

Coupons These are usually strip, flush discs or cylindrical rods mounted in suitable racks (inserted and retrieved at shutdown), or installed in the plant using high-pressure access systems. Coupons are available from several manufacturers in a variety of materials and surface finishes and are supplied pre-weighed. 

Add the NIPA-containing isooctane sample to the reservoir, and elute the solution dropwise. Add 10 mL of isooctane to rinse the glass tube, and apply this rinse to the column before the column runs completely dry. Next, allow the column to go to dryness for at least 1 min under vacuum. Release the vacuum, and insert the collecting rack with 5-mL tubes. Elute NIPA dropwise with 5mL of isooctane-ethyl acetate (9 1, v/v) under a vacuum of about 10 inHg. After the elution is complete, apply full vacuum (approximately 20 inHg), and allow the columns to drain completely dry. Release the vacuum slowly. 

The deposition of crystalline scales, air-borne contaminants, biofilms, etc. tends to be higher on previously fouled or corroded surfaces than on clean surfaces. Also, deposition and fouling affect both the rates and mechanisms of corrosion on a clean metal surface. It can therefore be useful to obtain subjective information on deposition and fouling tendencies in a cooling system, provided that the methods are simple and produce results quickly. The use of blank coupons inserted in a bypass corrosion rack can often provide this support information. 

UMEs used in our laboratory were constructed by sealing of carbon fibre into low viscosity epoxy resin (see Fig. 32.4) [118]. This method is simple, rapid and no specialised instrumentation is required. Firstly, the fibres are cleaned with this aim. They are immersed in dilute nitric acid (10%), rinsed with distilled water, soaked in acetone, rinsed again with distilled water and dried in an oven at 70°C. A single fibre is then inserted into a 100- iL standard micropipette tip to a distance of 2 cm. A small drop of low-viscosity epoxy resin (A. R. Spurr, California) is carefully applied to the tip of the micropipette. Capillary action pulls the epoxy resin, producing an adequate sealing. The assembly is placed horizontally in a rack and cured at 70°C for 8h to ensure complete polymerization of the resin. After that, the electric contact between the carbon fibre and a metallic wire or rod is made by back-filling the pipette with mercury or conductive epoxy resin. Finally, the micropipette tip is totally filled with epoxy resin to avoid the mobility of the external connection. Then, the carbon fibre UME is ready. An optional protective sheath can be incorporated to prevent electrode damage. 

Bake for 35 to 40 minutes, or until a tester inserted in the center comes out clean. Cool in the pans for IO minutes, then invert onto a wire rack. 

The samples were taken directly from the reactor through two modules shown in Fig. 2. The modules were inserted in the reactor and connected via two peristaltic pumps with an autosampler including a rack, which was refrigerated to -18°C. The samples could be stored at -20°C for some weeks without a... 

Fill the incubation container with enough retrieval buffer (typically 250 ml ) to cover slides. Insert the slide rack and cover. 

A pair of rigid stainless-steel wire hook-like electrodes with a distance of 4 mm are adjusted to the artery by means of a rack and pinion gear manipulator. The artery is raised slightly away from the surrounding tissue. Isolation of the electrodes is achieved by the insertion of a small piece of parafilm under the artery. Blood flow is measured with an ultrasonic Doppler flowmeter (Transonic, Ithaca NY, USA) the flow probe (1RB) is placed proximal to the damaged area. 

Fluoride. Fit a 4 ml (75 x 10 mm) test-tube with a cork carrying a tube about 8 cm long and of about 3 mm bore cut a V-shaped groove in the cork. Adjust the tube in the cork so that the lower end is about 2-5 cm from the bottom of the test-tube (cf. Fig. V. 1). Place 15-20 mg of the substance and 0-5 ml concentrated H2S04 in the test-tube, dip the glass tube into water so that a film of water almost seals the lower end to a depth of about 5 mm, insert into the test-tube, and place in the hot water rack. The formation of a white film in the water confirms fluoride (IV 17, 1). 

Place these racks in a 37°C water bath and insert the manifold tubes shown in Figure 4-14 so that the ends of the tubes are 2 to 3 cm above the liquid surface. With a large water bath up to 200 tubes (20 manifolds) can be evaporated at once. Evaporation may also be accomplished with a commercial concentrator such as the Brinkmann SC/48 Sample Concentrator. 

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