4 research outputs found
Shifts in desulfonating bacterial communities along a soil chronosequence in the forefield of a receding glacier
peer-reviewedForefields of receding glaciers are unique and sensitive environments representing
natural soil chronosequences where sulfate availability is assumed to be a limiting
factor. Bacterial mineralization of organo-sulfur is an important sulfate-providing
process in soils. We analyzed the diversity of sulfonate desulfurizing (desulfonating)
bacteria in the Damma glacier forefield on the basis of the key gene asfA by terminal
restriction fragment length polymorphism (T-RFLP) and clone libraries. The
community structure and sequence diversity of desulfonating bacteria differed
significantly between forefield soils deglaciated in the 1990s and the 1950s. Soil age
had a strong effect on the desulfonating rhizosphere communities of Agrostis
rupestris, but only little impact on the ones from Leucanthemopsis alpina. AsfA
affiliated to Polaromonas sp. was predominantly found in the more recent ice-free
soils and the corresponding rhizospheres of A. rupestris while a group of unidentified
sequences was found to be dominating the matured soils and the corresponding
rhizospheres of A. rupestris. The desulfonating bacterial diversity was not affected by
varying levels of sulfate concentrations. The level of asfA diversity in recently
deglaciated soils suggests that desulfonating bacteria are a critical factor in sulfur
cycling with defined groups dominating at different stages of soil formation.SUBMITTE
Rotating structures in low temperature magnetized plasmas—insight from particle simulations
Measurement of the spin structure of the deuteron in the DIS region
We present a new measurement of the longitudinal spin asymmetry Ad and the spin-dependent structure function g(1)(d) of the deuteron in the range 1 < Q(2) < 100 GeV2 and 0.004 < x < 0.7. The data were obtained by the COMPASS experiment at CERN using a 160 GeV polarised muon beam and a large polarised (LiD)-Li-6 target. The results are in agreement with those from previous experiments and improve considerably the statistical accuracy in the region 0.004 < x < 0.03. (c) 2005 Elsevier B.V. All rights reserved
Measurement of the I=1 /2 Kpi\u80 S -wave amplitude from Dalitz plot analyses of eta_c -->\u86\u92KKbar pi\u80 in two-photon interactions
We study the processes γγ→K0SK±π∓ and γγ→K+K-π0 using a data sample of 519 fb-1 recorded with the BABAR detector operating at the SLAC PEP-II asymmetric-energy e+e- collider at center-of-mass energies at and near the Υ(nS) (n=2, 3, 4) resonances. We observe ηc decays to both final states and perform Dalitz plot analyses using a model-independent partial wave analysis technique. This allows a model-independent measurement of the mass-dependence of the I=1/2 Kpi\u80 S-wave amplitude and phase. A comparison between the present measurement and those from previous experiments indicates similar behavior for the phase up to a mass of 1.5 GeV/c2. In contrast, the amplitudes show very marked differences. The data require the presence of a new a0(1950) resonance with parameters m=1931±14±22 MeV/c2 and Γ=271±22±29 MeV