| 1. |
- Schael, S, et al.
(författare)
-
Precision electroweak measurements on the Z resonance
- 2006
-
Ingår i: Physics Reports. - : Elsevier BV. - 0370-1573 .- 1873-6270. ; 427:5-6, s. 257-454
-
Forskningsöversikt (refereegranskat)abstract
- We report on the final electroweak measurements performed with data taken at the Z resonance by the experiments operating at the electron-positron colliders SLC and LEP. The data consist of 17 million Z decays accumulated by the ALEPH, DELPHI, L3 and OPAL experiments at LEP, and 600 thousand Z decays by the SLID experiment using a polarised beam at SLC. The measurements include cross-sections, forward-backward asymmetries and polarised asymmetries. The mass and width of the Z boson, m(Z) and Gamma(Z), and its couplings to fermions, for example the p parameter and the effective electroweak mixing angle for leptons, are precisely measured: m(Z) = 91.1875 +/- 0.0021 GeV, Gamma(Z) = 2.4952 +/- 0.0023 GeV, rho(l) = 1.0050 +/- 0.0010, sin(2)theta(eff)(lept) = 0.23153 +/- 0.00016. The number of light neutrino species is determined to be 2.9840 +/- 0.0082, in agreement with the three observed generations of fundamental fermions. The results are compared to the predictions of the Standard Model (SM). At the Z-pole, electroweak radiative corrections beyond the running of the QED and QCD coupling constants are observed with a significance of five standard deviations, and in agreement with the Standard Model. Of the many Z-pole measurements, the forward-backward asymmetry in b-quark production shows the largest difference with respect to its SM expectation, at the level of 2.8 standard deviations. Through radiative corrections evaluated in the framework of the Standard Model, the Z-pole data are also used to predict the mass of the top quark, m(t) = 173(+10)(+13) GeV, and the mass of the W boson, m(W) = 80.363 +/- 0.032 GeV. These indirect constraints are compared to the direct measurements, providing a stringent test of the SM. Using in addition the direct measurements of m(t) and m(W), the mass of the as yet unobserved SM Higgs boson is predicted with a relative uncertainty of about 50% and found to be less than 285 GeV at 95% confidence level. (c) 2006 Elsevier B.V. All rights reserved.
|
|
| 2. |
- Dreyer, Bo, et al.
(författare)
-
Spectrum of USH2A mutations in Scandinavian patients with Usher Syndrome type II
- 2008
-
Ingår i: Human Mutation. - : Wiley-Liss. - 1059-7794 .- 1098-1004. ; 29:3, s. 451-451
-
Tidskriftsartikel (refereegranskat)abstract
- Usher syndrome type II (USH2) is an autosomal recessive disorder, characterised by moderate to severe high-frequency hearing impairment, normal balance function and progressive visual impairment due to retinitis pigmentosa. Usher syndrome type IIa, the most common subtype, is defined by mutations in the USH2A gene encoding a short and a recently discovered long usherin isoform comprising 21 and 73 exons, respectively. More than 120 different disease-causing mutations have been reported, however, most of the previous reports concern mutations restricted to exons 1-21 of the USH2A gene. To explore the spectrum of USH2A disease-causing mutations among Scandinavian USH2 cases, patients from 118 unrelated families of which 27 previously had been found to carry mutations in exons 1-21 were subjected to extensive DNA sequence analysis of the full size USH2A gene. Altogether, 122 USH2A DNA sequence alterations were identified of which 57 were predicted to be disease-causing, 7 were considered to be of uncertain pathogenicity and 58 were predicted to be benign variants. Of 36 novel pathogenic USH2A mutations 31 were located in exons 22-73, specific to the long isoform. USH2A mutations were identified in 89/118 (75.4%) families. In 79/89 (88.8%) of these families two pathogenic mutations were identified whereas in 10/89 (11.2%) families the second mutation remained unidentified. In 5/118 (4.2%) families the USH phenotype could be explained by mutations in the USH3A gene. The results presented here provide a comprehensive picture of the genetic aetiology of Usher syndrome type IIA in Scandinavia as it is known to date.
|
|
| 3. |
|
|
| 4. |
- Heijl, Anders, et al.
(författare)
-
Nordic research in ophthalmology.
- 2005
-
Ingår i: Acta ophthalmologica Scandinavica. - : Wiley. - 1395-3907 .- 1600-0420. ; 83:3, s. 278-88
-
Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- Nordic ophthalmologists and vision scientists are active in many fields of eye research. This is most evident at the biannual Nordic Congress of Ophthalmology, most recently held in Malmö in June 2004. The authors here review some of the research in vision and ophthalmology presented at this meeting or published recently by Nordic scientists. This paper does not represent a comprehensive review of all Nordic research in the field, but attempts to give an overview of some of the activities underway in eye research in this part of the world.
|
|
| 5. |
|
|
| 6. |
|
|
| 7. |
- Rosenberg, Rutger, 1943, et al.
(författare)
-
Biology of the basket star Gorgonocephalus caputmedusae (L.)
- 2005
-
Ingår i: Marine Biology. - : Springer Science and Business Media LLC. - 0025-3162 .- 1432-1793. ; 148, s. 43-50
-
Tidskriftsartikel (refereegranskat)abstract
- Ophiurid basket stars belonging to the family Gorgonocephalidae are distributed from the Arctic to the Antarctic and from the shallow subtidal to the deep sea, but their biology remains poorly known. In situ observations at the mouth of the Oslofjord by a remotely operated vehicle showed that Gorgonocephalus caputmedusae had a patchy distribution at 85 to 120 m water depth and frequently occurred in association with the gorgonian Paramuricea placomus and the coral Lophelia pertusa. Morphological and histological studies show that G. caputmedusae is well adapted to capture macroplanktonic prey. Histological examination of the arms revealed the presence of a thick layer of dermal mutable connective tissue which is probably an energyefficient way to maintain its feeding posture against the current. This layer is connected to the nerve cord suggesting that the passive mechanical properties (stiffness) is controlled by the nervous system. In the distal parts of the arms, each segment has a pair of sticky tube feet and a sophisticated system of spines and hooks, which are connected to muscles and collagenous tendons. In combination, these features were shown, in an experimental flume study, to be used for capturing the locally abundant krill species Meganyctiphanes norvegica. This is the first documentation of G. caputmedusae of this kind
|
|
| 8. |
|
|
