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排序方式: 共有107条查询结果,搜索用时 15 毫秒
1.
M. Mayr K. -H. Speidel M. Knopp W. Karle T. Faestermann F. Hagelberg H. -J. Simonis P. N. Tandon J. Gerber 《Zeitschrift für Physik A Hadrons and Nuclei》1987,327(2):157-161
[Theg-factor ratio of the first excited 3? and 5? states in40Ca was measured to beg 3/g 5=1.01(10) employing the implantation perturbed angular correlation technique. The static hyperfine fields (SF) in Fe and Gd hosts were used. In addition the lifetime of the 5? state was measured to be τ=426(7)ps. The values of the SF in Gd and Fe hosts were deduced and compared with systematics in this element region. 相似文献
2.
KL Britton HF Rogers Y Asano T Dairi Y Kato TJ Stillman DW Rice 《Acta crystallographica. Section D, Biological crystallography》1998,53(4):124-126
The novel NAD+-linked opine dehydrogenase from a soil isolate Arthrobacter sp. strain 1C belongs to an enzyme superfamily whose members exhibit quite diverse substrate specificites. Crystals of this opine dehydrogenase, obtained in the presence or absence of co-factor and substrates, have been shown to diffract to beyond 1.8 ? resolution. X-ray precession photographs have established that the crystals belong to space group P21212, with cell parameters a = 104.9, b = 80.0, c = 45.5 ? and a single subunit in the asymmetric unit. The elucidation of the three-dimensional structure of this enzyme will provide a structural framework for this novel class of dehydrogenases to enable a comparison to be made with other enzyme families and also as the basis for mutagenesis experiments directed towards the production of natural and synthetic opine-type compounds containing two chiral centres. 相似文献
3.
H. -J. Simonis S. Kremeyer F. Hagelberg U. Reuter M. Knopp K. -H. Speidel J. Cub W. Karle P. N. Tandon J. Gerber 《Hyperfine Interactions》1990,61(1-4):1351-1354
From hyperfine interaction studles on free single electron16O(3−) ions. in a time differential mode using the recoil distance technique. It is shown that these ions are polarized when emerging
from magnetized thin layers of Fe. The observed degree of polarization
, however, is smaller than expected from transient field measurements. 相似文献
4.
5.
K. -H. Speidel M. Knopp W. Karle U. Kilgus M. -L. Dong H. -J. Simonis F. Hagelberg J. Gerber 《Zeitschrift für Physik A Hadrons and Nuclei》1988,331(1):29-36
Transient field precessions have been measured with the first excited 2 1 + -state as probe for ions of28Si traversing Fe at vion?1v0 and 13v0(v0=c/137) and62Ni being stopped in Fe. The degree of polarization deduced for the Si ions, p1s=0.19(6), is consistent with low-velocity data. There is clear evidence that the field strength is attenuated by heavy ion beams. For the62Ni(2 1 + ) state at 1.173 MeV a g-factor value of g=0.34(7) was obtained in good agreement with a previous result. 相似文献
6.
H. -J. Simonis F. Hagelberg K. -H. Speidel M. Knopp W. Karle U. Kilgus J. Gerber 《Zeitschrift für Physik A Hadrons and Nuclei》1988,330(4):361-364
Precessions of the very short-lived 2 1 + - and 4 1 + -states in32S have been measured using the transient field technique. The deducedg-factor of the 4 1 + -state g=+0.40(15) agrees with the known value of the 2 1 + -state and with theoretical predictions. In addition, the lifetimes of both states were redetermined and are consistent with previous results. 相似文献
7.
8.
Aravinda S Shamala N Das C Sriranjini A Karle IL Balaram P 《Journal of the American Chemical Society》2003,125(18):5308-5315
Aromatic-aromatic interactions between phenylalanine side chains in peptides have been probed by the structure determination in crystals of three peptides: Boc-Val-Ala-Phe-Aib-Val-Ala-Phe-Aib-OMe, I; Boc-Val-Ala-Phe-Aib-Val-Ala-Phe-Aib-Val-Ala-Phe-Aib-OMe, II; Boc-Aib-Ala-Phe-Aib-Phe-Ala-Val-Aib-OMe, III. X-ray diffraction studies reveal that all three peptides adopt helical conformations in the solid state with the Phe side chains projecting outward. Interhelix association in the crystals is promoted by Phe-Phe interactions. A total of 15 unique aromatic pairs have been characterized in the three independent crystal structures. In peptides I and II, the aromatic side chains lie on the same face of the helix at i/i + 4 positions resulting in both intrahelix and interhelix aromatic interactions. In peptide III, the Phe side chains are placed on the opposite faces of the helix, resulting in exclusive intermolecular aromatic interactions. The distances between the centroids of aromatic pair ranges from 5.11 to 6.86 A, while the distance of closest approach of ring carbon atoms ranges from 3.27 to 4.59 A. Examples of T-shaped and parallel-displaced arrangements of aromatic pairs are observed, in addition to several examples of inclined arrangements. The results support the view that the interaction potential for a pair of aromatic rings is relatively broad and rugged with several minima of similar energies, separated by small activation barriers. 相似文献
9.
K. -H. Speidel M. Knopp W. Karle M. Mayr F. Hagelberg H. -J. Simonis J. Gerber P. N. Tandon 《Zeitschrift für Physik D Atoms, Molecules and Clusters》1987,6(1):43-48
Effective transient magnetic fields have been measured for single-electron carbon and oxygen ions traversing ferromagnetic Ni and Gd hosts, respectively. The deduced values ofK-shell polarization are well explained considering spin exchange scattering as a dominant mode of polarization. 相似文献
10.
Richard Gilardi Clifford George Jerome Karle Philip E. Eaton Allison M. Fisher 《Journal of heterocyclic chemistry》1993,30(5):1385-1388
Exploration of the reactions of the 9-azahomocubane system led to derivatives of two small-ring systems containing aza-bridging atoms, 5-azatetracyclo[4.2.0.03,8.04,7]octane and 9-azatetracyclo[4.3.0.02,5.04,7]nonane. The structures were characterized by X-ray diffraction analyses. There are no prior X-ray structural reports on these systems. 相似文献