Roll tubes

Any region where two surfaces are loosely joined or come into close proximity qualifies as a crevice site as long as water may enter. Partially exfoliated coatings may produce crevices. Surfaces may be metallic or nonmetallic. Usually, however, at least one surface is metallic. Crevices commonly are present at gaskets, flanges, washers, bolt holes, rolled tube ends, incompletely fused welds, contact points in plate-and-... 

Figure 3.25 Epoxy-coated section of a tube sheet and rolled tube.

Hungate R E (1969) A roll tube method for cultivation of strict anaerobes. In Methods in Microbiology (Eds Norris and DW Ribbons), Vol 3B, pp 117-132. Academic Press, New York. 

Joblin KN (1981) Isolation, enumeration, and maintenance of rumen anaerobic fungi in roll tubes. Appl Environ Microbiol A2 1119-1122. 

The intensive search for new organic fungicides has continued for over 30 years. The technique employed in most laboratories is to make an extensive survey of various structures by empirical methods to locate materials that suppress spore germination on glass slides or prevent mycelial growth on nutrient agar plates or rolled tubes. Those materials having an ED ] (effective dose for 50% inhibition) in (he order of 10 ppm are further tested in use applications. 

Leatherwood (49) interprets his observations made with roll tube cultures of the anaerobic bacterium Ruminococcus albus to indicate that a single cellulase complex is formed from enzymes diffusing from two different colony types. He discussed the mechanism in terms of a non-... 

Curators, collectors, and conservators need to be on constant guard against acidic tissue paper that has discolored with age. Textiles stored with highly acid tissue papers also will become discolored with time. There are acid-free and alkaline-buffered tissue papers commercially available through archival paper and supply firms. In the last several years, paper companies have become aware of the needs of historic textiles and costume departments in museums, historical societies, and universities and are placing into production acid-free rolling tubes, tissue paper, and storage boxes for costumes and accessories. 

Stress relieve carbon and chrome steel welds and cold bends in amine service regardless of service temperature. For all concentrations of carbonate solutions and in concentrations of caustic up to 30 percent stress relieve for service temperatures above 140 F (60 C). For 30 to 50 percent caustic, the service temperature where stress relief is required decreased from 140 >F(60°C) to 118T (4B C). Welded tubing does not require heal treatment in addition to that required by the ASTM specifications. Rolled tube-to-tube sheet joints do not require stress relief. 

Hold rolled tube in position with masking tape or hose clamps. Test fit internal parts to check for correct tube ID. 

Specific Electrical Energy Consumption rolling tube cell [77, 78],... 

Ruminococcus albus strain 7, (1), was grown on cellulose roll tubes according to the Hungate technique (2). Either Avicel (FMC Corporation, Marcus Hook, Pa.) or balled filter paper was used as the cellulose source. Three milliliters of melted cellulose-medium at 45 °C. in 16 X 150 mm. tubes were inoculated with the bacteria under a gas phase of 95% C02 and 5% H2. The tubes were subsequently stoppered and rolled in a tray of ice in order to form a film of agar medium around the... 

Figure 1. Cellulase complex formation as the result of substances diffusing from two colony-types on cellulose roll tubes. The arc or line of clearing occurring between the colonies is because of degradation of the cellulose...

The method for fabricating nanotubes from GaAs/InAs strained heterostructures [2-4] is schematically illustrated by Fig. 1. The diameter D of self-formed tubes depends on the thickness d of the initial heterofilm and on the value of the elastic stress in it. This diameter therefore can be defined precisely in an MBE process. For a heterofilm made using two layers with identical thickness d, we have D d/(L a/a), where Aa/a is the lattice mismatch between the two layers. The high quality of MBE-grown heterostmctures makes it possible to obtain several centimeter long rolled tubes with diameters as small as 3 mn and with atomically smooth and uniform tube walls. From the above structures not only tubes, spirals and rings [2-4] but also other various shells formed by locally released films can be prepared [5,9]. 

Roll tubes may be used as an alternative to plates. In these the sample is added to a tube containing molten agar which is then rotated rapidly on a mechanical roller until the agar sets. The tubes are incubated and counted. This method uses less agar than traditional pour plates and is widely used in the dairy industry. 

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