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Sökning: WFRF:(Khan Shahid N.)

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11.
  • Ahlner, Alexandra, 1984-, et al. (författare)
  • Fractional enrichment of proteins using [2-13C]-glycerol as the carbon source facilitates measurement of excited state 13Cα chemical shifts with improved sensitivity
  • 2015
  • Ingår i: Journal of Biomolecular NMR. - : Springer Netherlands. - 0925-2738 .- 1573-5001. ; 62:3, s. 341-351
  • Tidskriftsartikel (refereegranskat)abstract
    • A selective isotope labeling scheme based on the utilization of [2-13C]-glycerol as the carbon source during protein overexpression has been evaluated for the measurement of excited state 13Cα chemical shifts using Carr–Purcell–Meiboom–Gill (CPMG) relaxation dispersion (RD) experiments. As expected, the fractional incorporation of label at the Cα positions is increased two-fold relative to labeling schemes based on [2-13C]-glucose, effectively doubling the sensitivity of NMR experiments. Applications to a binding reaction involving an SH3 domain from the protein Abp1p and a peptide from the protein Ark1p establish that accurate excited state 13Cα chemical shifts can be obtained from RD experiments, with errors on the order of 0.06 ppm for exchange rates ranging from 100 to 1000 s−1, despite the small fraction of 13Cα–13Cβ spin-pairs that are present for many residue types. The labeling approach described here should thus be attractive for studies of exchanging systems using 13Cα spin probes.
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12.
  • Tariq, N., et al. (författare)
  • A Novel Kite-Shaped Chipless RFID Tag for Low-Profile Applications
  • 2019
  • Ingår i: IETE Journal of Research. - : Informa UK Limited. - 0377-2063 .- 0974-780X. ; , s. 1-8
  • Tidskriftsartikel (refereegranskat)abstract
    • In this paper a novel, compact 10-bit chipless radio frequency identification (RFID) tag with stable readable characteristics is proposed. The tag is composed of several concentric novel kite-shaped loop resonators. The desired data sequence is obtained by the insertion or removal of nested elements, offering a 1:1 data bit to resonance correspondence. Each data sequence is encoded in the spectral domain of the tag. The proposed tag shows operability at different polarizations and incident angles of the impinging electromagnetic waves. Operating within the ultra-wideband (UWB), the tag is realized on the Roger RT/duroid® 5880 substrate having physical dimensions of 13.55 × 13.55 mm2. The measurement results of the design reveal a high code density and spectral efficiency of 5.44 bits/cm2 and 2 bits/GHz, respectively. The compact and robust passive chipless RFID tag having scalable data storage potential can be deployed in numerous low-profile applications such as those of wearable and healthcare.
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  • Resultat 11-12 av 12

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