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  • Digitale Medien  (3)
  • EORTC QLQ-C30  (1)
  • PACS. 73.63.Fg Nanotubes – 73.61.Wp Fullerenes and related materials – 73.22.-f Electronic structure of nanoscale materials: clusters, nanoparticles, nanotubes, and nanocrystals  (1)
  • Site-specific labeling of RNA  (1)
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  • Digitale Medien  (3)
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  • 1
    Digitale Medien
    Digitale Medien
    AC Stark effect in toroidal carbon nanotubes threaded with an ac magnetic flux (2003)
    Springer
    The European physical journal 33 (2003), S. 365-372 
    Details
    ISSN: 1434-6036
    Schlagwort(e): PACS. 73.63.Fg Nanotubes – 73.61.Wp Fullerenes and related materials – 73.22.-f Electronic structure of nanoscale materials: clusters, nanoparticles, nanotubes, and nanocrystals
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract: The ac Stark effect is investigated in the toroidal carbon nanotube system threaded with an ac magnetic flux. The Floquet theory is employed to deal with the time-dependent quantum problems. The time-averaged energy of the system is derived and is found to exhibit a strong relationship with an external field, and the modified energy gap has been presented. The ac flux enhances energy gaps to cause metal-semiconductor transition. The steady current has been obtained by employing the free energy approach, and the persistent current is a special case as the magnitude of the ac flux approaches zero. The photon-assisted current is quite different from the persistent current due to the absorption and emission of photons. The local density of states is obtained by calculating the Green's function in the Floquet state, and photon-resonant structures are observed. All of the novel features are associated with the ac Stark effect, which is caused by the modification of energy levels.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1140/epjb/e2003-00177-4
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  • 2
    Digitale Medien
    Digitale Medien
    Specific labeling approaches to guanine and adenine imino and amino proton assignments in the AMP–RNA aptamer complex (1997)
    Springer
    Journal of biomolecular NMR 9 (1997), S. 55-62 
    Details
    ISSN: 1573-5001
    Schlagwort(e): Site-specific labeling of RNA ; 15N labeling of guanine and adenine ; Inosine-for-guanine substitution
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Chemie und Pharmazie
    Notizen: Abstract The secondary structure of a recently identified ATP-binding RNA aptamer consists of apurine-rich 11-residue internal loop positioned opposite a single guanine bulge flanked oneither side by helical stem segments. The ATP ligand targets the internal loop and bulgedomains, inducing a structural transition in this RNA segment on complex formation.Specifically, 10 new slowly exchanging proton resonances in the imino, amino and sugarhydroxyl chemical shift range are observed on AMP–RNA aptamer complex formation.This paper outlines site-specific labeling approaches to identify slowly exchanging imino(guanine) and amino (guanine and adenine) protons in internal loop and bulge segments ofcompact RNA folds such as found in the AMP–RNA aptamer complex. One approachincorporates 15N-labeled guanine (N1 imino and N2 amino positions) and 15N-labeledadenine (N6 amino position), one residue at a time, in the AMP-binding RNA aptamer, withlabeling incorporation through chemical synthesis facilitated by generating the aptamer fromtwo separate strands. The unambiguous assignments deduced from the 15N labeling studieshave been verified from an independent labeling strategy where individual guanines in theinternal loop have been replaced, one at a time, by inosines and assignments were made onthe basis of the large 2 ppm downfield shift of the guanine imino protons on inosinesubstitution. The strengths and limitations of the inosine-for-guanine substitution approachemerge from our studies on the AMP–RNA aptamer complex. The assignment of theinternal loop and bulge imino and amino protons was critical in our efforts to define thesolution structure of the AMP–RNA aptamer complex since these slowly exchangingprotons exhibit a large number of long-range intramolecular NOEs within the RNA, as wellas intermolecular NOEs to the AMP in the complex. The current application of specific 15Nand inosine labeling approaches for exchangeable imino and amino proton assignments in thenonhelical segments of an RNA aptamer complex in our laboratory complements selective 2Hand 13C approaches to assign nonexchangeable base and sugar protons in RNA andligand–RNA complexes reported in the literature.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1018623601946
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  • 3
    Digitale Medien
    Digitale Medien
    Translation and validation of the Standard Chinese version of the EORTC QLQ-C30 (2000)
    Springer
    Quality of life research 9 (2000), S. 129-137 
    Details
    ISSN: 1573-2649
    Schlagwort(e): EORTC QLQ-C30 ; Gynecological cancer ; Psychometric property ; Quality of life ; Standard Chinese
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract The majority of quality of life (QOL) questionnaires have been developed and used in English-speaking or Western European countries. The aims of this study were to provide the Standard Chinese version of the European Organization for Research and Treatment of Cancer Quality of Life Core Questionnaire (EORTC QLQ-C30 version 2.0), and evaluate its psychometric properties. The translation process included independent translation, back translation, a pilot test with gynecological cancer patients, and a review and approval by the original developers. Participants in the major study included gestational trophoblastic disease patients (n = 68), ovarian cancer patients (n = 105), and other types of gynecological cancer patients (n = 18). The average completion time of the Standard Chinese version was 8.1 ± 2.9 min. All item-subscale correlation coefficients exceeded the criterion of item-convergent validity (r 〉 0.40) except item 1, 5, 20, and 25, and all items correlated significantly higher with their own subscale than with other subscales except item 1, 20, and 25. The correlation coefficients among all subscales were significant but modest (r = 0.40–0.70). Seven out of nine subscales met the minimal standards of reliability (Cronbach's α 〉 0.70). In conclusion, the Standard Chinese version of the EORTC QLQ-C30 is a valid instrument overall in assessing the QOL of Chinese gynecological cancer patients.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1008981520920
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