Screw-cap scintillation

Many times swab samples have to be taken at a remote location where the equipment necessary for the analysis may not be available. Because the samples would be in transit for 24-48 h, an alternative to using test tubes for sample transport was investigated. Screw-cap scintillation vials either with a polyethylene insert or with an aluminum foil liner in the top of the cap were tested. Four polyester swabs were placed into each vial along with 10 mL of 1.00 pg/mL 50 50 ethanohwater solution of clarithromycin or 10 mL of 50 50 ethanohwater. The vials were capped and then shaken to wet the surface of the vials. Half the vials were refrigerated and the other half were left at room temperature on the... 

Potassium phosphate buffer, 0.2 M, pH 7.0 Screw cap scintillation or similar type of vials, 20 mL Reagents for gel preparation ... 

For each sample and control pipet 5.0 mL of thoroughly mixed separation suspension (bottle is inverted five times before removing each 5 mL unit) into a 7-mL plastic screw cap scintillation vial. NB Any labeling of the vial is only done on the vial s cap. 

Compound 13 (0.040 g, 0.10 mmol) and dichloromethane (2 mL, 0.05 M) were placed in a small screw-cap scintillation vial equipped with a magnetic stirbar. Powdered 4 A molecular sieves (0.050 g) and indium(III) chloride (0.0022 g, 0.010 mmol) were added, and the reaction was allowed to stir at room temperature. Upon completion of the reaction (usually 16 h), the... 

Scintillation measurements are usually carried out using 20 ml standard vials, or 6 ml mini-vials equipped with screw caps. Disposable vials are available in polypropylene, polyester or polycarbonate. Glass vials, which must be of low potassium content because the naturally occurring 40K isotope is a /S emitter, can be re-used. Care should be taken that tbey do not get scratched. Cerenkov counting is usually carried out in 1 ml, 500 pi or 250 pi Eppendorf vials, placed either in special adaptors or in 20 ml standard vials. For accurate and reliable measurements, the positioning of the vials must all be the same, to ensure that the counting geometry with respect to the photomultiplier tube is identical. 

Ten ml of the test solutions were kept in treated screw cap glass vials and 0.500 ml aliquots withdrawn periodically. Plutonium was separated by oxidation state by a solvent extraction method (IJ) and the alpha activity counted with a liquid scintillation counter using "Handifluor" (Mallinckrodt) as the cocktail. 

Screw-cap polyethylene tubes, 50-mL Screw-cap polyethylene scintillation vials, 20-mL 12 X 75 mm and 13 x 100 mm polypropylene tubes with caps Polypropylene microfuge (Eppendorf) tubes. 

Disposable electrodeposition cells are constructed from 20 ml polyethylene liquid scintillation vials with the bottoms cut off. The cap is replaced with a black plastic cap with a 1.6-cm hole in the top. A polished stainless steel disk is inserted into the cap with the polished side toward the inside of the vial and the cap is tightly screwed into place. The splatter guard is made from plastic test tube cap that is slightly larger than the scintillation vial and has a hole bored into it approximately 0.6 cm from the edge to allow the platinum wire anode to pass through. 

These baskets function as sieves, needed to hold the embryos during dechorionation and the washing steps following it. They can be made as follows cut a plastic scintillation vial in half. Also cut off the top of the cap, so that it forms an open ring. Place a piece of fine synthetic mesh around the top of the vial and hold it in place by screwing the open top back on. 

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