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- Ablikim, M., et al.
(författare)
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Measurements of (XcJ)-> K+K-K+K- decays
- 2006
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Ingår i: Physics Letters B. - : Elsevier BV. - 0370-2693 .- 1873-2445. ; 642:3, s. 197-202
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Tidskriftsartikel (refereegranskat)abstract
- Using 14M psi(2S) events taken with the BESII detector, chi(cJ) -> 2(K+K-) decays are studied. For the four-kaon final state, the branching fractions are B(chi(c0,1,2) ->.2(K+K-)) = (3.48 +/- 0.23 +/- 0.47) x 10(-3), (0.70 +/- 0.13 +/- 0.10) x 10(-3), and (2.17 +/- 0.20 +/- 0.31) x 10(-3). For the phi K+K- final state, the branching fractions, which are measured for the first time, are B(chi(c0,1,2) -> phi K+K-) = (1.03 +/- 0.22 +/- 0.15) x 10(-3), (0.46 +/- 0.16 +/- 0.06) x 10(-3), and (1.67 +/- 0.26 +/- 0.24) x 10(-4). For the phi phi final state, B(chi(c0,2) -> phi phi) = (0.94 +/- 0.21 +/- 0.13) x 10(-3) and (1.70 +/- 0.30 +/- 0.25) x 10(-3).
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| 2. |
- Kim, Do Kyung, et al.
(författare)
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Monodispersed Fe-Pt nanoparticles for biomedical applications
- 2005
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Ingår i: Journal of Applied Physics. - : AIP Publishing. - 0021-8979 .- 1089-7550. ; 97:10, s. 10Q918-
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Tidskriftsartikel (refereegranskat)abstract
- Monodispersed Fe-Pt nanoparticles are promising candidates for biomedical applications with an average particle diameter of 6.9 nm Fe48Pt52, 3.3 nm Fe52Pt48, and 4.2 nm Fe70Pt30. They are prepared by simultaneous chemical reduction of Pt(acac)(2) and thermal decomposition of Fe(CO)(5) in the presence of surfactant as an anti-oxidation reagent and amine as a stabilizer. The blocking temperatures, T-b, of 9 K for Fe70Pt30, 11 K for Fe52Pt48 and 14.4 K for Fe48Pt52 and the mean diameter of the spherical magnetic particles were estimated from the calculated volume to be 3.6, 3.1, and 3.8 nm. The cytotoxicity of unmodified Fe-Pt nanoparticles was performed in brain endothelial cells. Fe48Pt52 nanoparticles were not found to have any significant toxicity on bEnd3 cells during a 24 h period.
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| 3. |
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| 4. |
- Lai, I. H, et al.
(författare)
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A unique tetrameric structure of deer plasma haptoglobin – an evolutionary advantage in the Hp 2-2 phenotype with homogeneous structure
- 2008
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Ingår i: FEBS Journal. - 1742-4658 .- 1742-464X. ; 275, s. 981-993
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Tidskriftsartikel (refereegranskat)abstract
- Similar to blood types, human plasma haptoglobin (Hp) is classified intothree phenotypes: Hp 1-1, 2-1 and 2-2. They are genetically inheritedfrom two alleles Hp 1 and Hp 2 (represented in bold), but only theHp 1-1 phenotype is found in almost all animal species. The Hp 2-2protein consists of complicated large polymers cross-linked by a2-bsubunits or (a2-b)n (where n ‡ 3, up to 12 or more), and is associatedwith the risk of the development of diabetic, cardiovascular and inflammatorydiseases. In the present study, we found that deer plasma Hpmimics human Hp 2, containing a tandem repeat over the a-chain basedon our cloned cDNA sequence. Interestingly, the isolated deer Hp ishomogeneous and tetrameric, i.e. (a-b)4, although the locations of )SHgroups (responsible for the formation of polymers) are exactly identicalto that of human. Denaturation of deer Hp using 6 m urea under reducingconditions (143 mm b-mercaptoethanol), followed by renaturation,sustained the formation of (a-b)4, suggesting that the Hp tetramers arenot randomly assembled. Interestingly, an a-chain monoclonal antibody(W1), known to recognize both human and deer a-chains, only binds tointact human Hp polymers, but not to deer Hp tetramers. This impliesthat the epitope of the deer a-chain is no longer exposed on the surfacewhen Hp tetramers are formed. We propose that steric hindrance playsa major role in determining the polymeric formation in human and deerpolymers. Phylogenetic and immunochemical analyses revealed that theHp 2 allele of deer might have arisen at least 25 million years ago. Amechanism involved in forming Hp tetramers is proposed and discussed,and the possibility is raised that the evolved tetrameric structure of deerHp might confer a physiological advantage.
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