| 1. |
- Hagiwara, K, et al.
(författare)
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Review of particle physics
- 2002
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Ingår i: Physical Review D (Particles and Fields). - 0556-2821. ; 66:1
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Forskningsöversikt (refereegranskat)abstract
- This biennial Review summarizes much of Particle Physics Using data from previous editions, plus 2205 new measurements from 667 papers, we list, evaluate, and average measured properties of gauge bosons, leptons, quarks, mesons, and baryons We also summarize searches for hypothetical particles such as Higgs bosons, heavy neutrinos, and supersymmetric particles All the particle properties and search limits are listed in Summary Tables We also give numerous tables, figures, formulae, and reviews of topics such as the Standard Model, particle detectors, probability, and statistics This edition features expanded coverage of CP violation in B mesons and of neutrino oscillations For the first time we cover searches for evidence of extra dimensions (both in the particle listings and in a new review) Another new review is on Grand Unified Theories A booklet is available containing the Summary Tables and abbreviated versions of some of the other sections of this full Review All tables, listings, and reviews (and errata) are also available on the Particle Data Group website http //pdg 1b1 gov.
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| 2. |
- Weston, M. D., et al.
(författare)
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Genomic structure and identification of novel mutations in usherin, the gene responsible for Usher syndrome type IIa (USH2A)
- 2000
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Ingår i: American Journal of Human Genetics. - : Elsevier BV. - 0002-9297 .- 1537-6605. ; 66:4, s. 199-210
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Tidskriftsartikel (refereegranskat)abstract
- Usher syndrome type IIa (USHIIa) is an autosomal recessive disorder characterized by moderate to severe sensorineural hearing loss and progressive retinitis pigmentosa. This disorder maps to human chromosome 1q41. Recently, mutations in USHIIa patients were identified in a novel gene isolated from this chromosomal region. The USH2A gene encodes a protein with a predicted molecular weight of 171.5 kD and possesses laminin epidermal growth factor as well as fibronectin type III domains. These domains are observed in other protein components of the basal lamina and extracellular matrixes; they may also be observed in cell-adhesion molecules. The intron/exon organization of the gene whose protein we name "Usherin" was determined by direct sequencing of PCR products and cloned genomic DNA with cDNA-specific primers. The gene is encoded by 21 exons and spans a minimum of 105 kb. A mutation search of 57 independent USHIIa probands was performed with a combination of direct sequencing and heteroduplex analysis of PCR-amplified exons. Fifteen new mutations were found. Of 114 independent USH2A alleles, 58 harbored probable pathologic mutations. Ten cases of USHIIa were true homozygotes and 10 were compound heterozygotes; 18 heterozygotes with only one identifiable mutation were observed. Sixty-five percent (38/58) of cases had at least one mutation, and 51% (58/114) of the total number of possible mutations were identified. The allele 2299delG (previously reported as 2314delG) was the most frequent mutant allele observed (16%; 31/192). Three new missense mutations (C319Y, N346H, and C419F) were discovered; all were restricted to the previously unreported laminin domain VI region of Usherin. The possible significance of this domain, known to be necessary for laminin network assembly, is discussed in the context of domain VI mutations from other proteins.
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| 3. |
- Echt, O., et al.
(författare)
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Vibrational Energy Dependence of the Triplet Lifetime in Isolated, Photo-Excited C60
- 2004
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Ingår i: J. Phys. Chem. A. - : American Chemical Society (ACS). - 1089-5639. ; 108, s. 6944-6952
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Tidskriftsartikel (refereegranskat)abstract
- We have measured the lifetime of the lowest triplet state T1 in free C60 by a pump-probe experiment using lasers with nanosecond pulse durations. At low pump fluence the population of T1 decays with a distinct, narrow distribution of lifetimes. depends on the pump wavelength ( = 532, 355, or 266 nm) as well as the temperature of the source from which C60 is vaporized (420 T 510 C); it ranges from 2 s to 0.3 s. At high pump fluence an additional lifetime as short as 40 ns is observed. A consistent correlation of all observed lifetimes with the experimental parameters is found if is assigned to an ensemble of C60 (T1) that has absorbed either one or two pump photons with the excess energy being randomized over all vibrational modes. Thus, = 2 s corresponds to a vibrational energy Evib = Etotal - Etriplet = 4.6 eV (one-photon absorption at = 532 nm, T = 420 C) while = 40 ns corresponds to Evib = 9.6 eV (two-photon absorption at 355 nm, 480 C). This result strongly suggests that delayed electrons that are emitted from highly excited C60 (Evib 10 eV) on the time scale of 10 ns to 1 ms are not affected by long-lived electronically excited states. The frequently questioned description of delayed electron emission from photoexcited C60 as thermionic emission is, therefore, warranted.
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| 4. |
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| 5. |
- Yao, Z.S., et al.
(författare)
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Comment on
- 2001
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Ingår i: Geophysical Journal International. - 0956-540X. ; 145, s. 307-314
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Tidskriftsartikel (refereegranskat)abstract
- When solving tomographic inversion problems, the resolution matrix is for the equation system can provide very useful information on how well the model parameters can be resolved. Recently, Nolet et NI. (1999)-referred to as NMV hereafter-proposed a onest
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