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Volumetric hydrogen storage in single-walled carbon nanotubes (2002)

Liu, C. ; Yang, Q. H. ; Tong, Y. ; [et al.]

Woodbury, NY : American Institute of Physics (AIP)

Applied Physics Letters 80 (2002), S. 2389-2391

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ISSN: 1077-3118

Source: AIP Digital Archive

Topics: Physics

Notes: Macroscopically long ropes of aligned single-walled carbon nanotubes (SWNTs), synthesized by a hydrogen and argon arc discharge method, were cold pressed into tablets without any binder for measurements of their volumetric hydrogen storage capacity. The typical apparent density of the tablets was measured to be around 1.7 g/cm3 with respect to a molding pressure of 0.75 Gpa. A volumetric and mass hydrogen storage capacity of 68 kg H2/m3 and 4.0 wt %, respectively, was achieved at room temperature under a pressure of 11 MPa for suitably pretreated SWNT tablets, and more than 70% of the hydrogen adsorbed can be released under ambient pressure at room temperature. Pore structure analysis indicated that the molding process diminished the mesopore volume of the SWNT ropes, but exerts little influence on their intrinsic pore textures. © 2002 American Institute of Physics.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.1466517

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Use of polymerase chain reaction epitope tagging for protein tagging in Saccharomyces cerevisiae (1995)

Schneider, B. L. ; Seufert, W. ; Steiner, B. ; [et al.]

New York, NY [u.a.] : Wiley-Blackwell

Yeast 11 (1995), S. 1265-1274

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ISSN: 0749-503X

Keywords: epitope ; tag ; PCR ; Life and Medical Sciences ; Genetics

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Biology

Notes: Epitope tagging is the insertion of a short stretch of amino acids constituting an epitope into another protein. Tagged proteins can be identified by Western, immunoprecipitation and immunofluorescence assays using pre-existing antibodies. We have designed vectors containing the URA3 gene flanked by direct repeats of epitope tags. We use the polymerase chain reaction (PCR) to amplify the tag-URA3-tag cassette such that the ends of the PCR fragments possess homology to the gene of interest. In vivo recombination is then used to direct integration of the fragment to the location of interest, and transformants are selected by their Ura+ phenotype. Finally, selection for Ura- cells on 5-fluoro-orotic acid plates yields cells where recombination between the repeated epitopes has ‘popped out’ the URA3 gene, leaving a single copy of the epitope at the desired location. PCR epitope tagging (PET) provides a rapid and direct technique for tagging that does not require any cloning steps. We have used PET to tag three Saccharomyces cerevisiae proteins, Cln1, Sic1 and Est1.

Additional Material: 4 Ill.