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- Hartley, M G, et al.
(författare)
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Protection afforded by heat shock protein 60 from Francisella tularensis is due to copurified lipopolysaccharide.
- 2004
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Ingår i: Infection and Immunity. - 0019-9567 .- 1098-5522. ; 72:7, s. 4109-13
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Tidskriftsartikel (refereegranskat)abstract
- Heat shock proteins (Hsps) have attracted significant attention as protective antigens against a range of diseases caused by bacterial pathogens. However, more recently there have been suggestions that the protective response is due to the presence of peptide components other than Hsps. We have shown that mice that had been immunized with purified heat shock protein 60 (Hsp60) isolated from Francisella tularensis were protected against a subsequent challenge with some strains of the bacterium. However, this protection appeared to be due to trace amounts of lipopolysaccharide, which were too low to be detected by using the Limulus amoebocyte lysate assay. This finding raises the possibility that the protection afforded by other bacterial Hsp60 proteins may be due to trace quantities of polysaccharide antigens carried by and acting in conjunction with the Hsps.
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- Ivchenko, Nickolay V., et al.
(författare)
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Observation of O+4P-D-4(0) lines in proton aurora over Svalbard
- 2004
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Ingår i: Geophysical Research Letters. - 0094-8276 .- 1944-8007. ; 31:10
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Tidskriftsartikel (refereegranskat)abstract
- Spectra of a proton aurora event show lines of O+ P-4-D-4(0) multiplet (4639-4696 Angstrom) enhanced relative to the N(2)(+)1N(0,2) compared to normal electron aurora. Conjugate satellite particle measurements are used as input to electron and proton transport models, to show that p/H precipitation is the dominant source of both the O+ and N(2)(+)1N emissions. The emission cross-section of the multiplet in p collisions with O and O-2 estimated from published work does not explain the observed O+ brightness, suggesting a higher emission cross-section for low energy p impact on O.
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- Ivchenko, Nickolay V., et al.
(författare)
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Observation of O+ (P-4-D-4(0)) lines in electron aurora over Svalbard
- 2004
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Ingår i: Annales Geophysicae. - : Copernicus GmbH. - 0992-7689 .- 1432-0576. ; 22:8, s. 2805-2817
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Tidskriftsartikel (refereegranskat)abstract
- This work reports on observations of O+ lines in aurora over Svalbard, Norway. The Spectrographic Imaging Facility measures auroral spectra in three wavelength intervals(H-beta, N-2(+) 1N(0,2) and N-2(+) 1N(1,3)). The oxygen ion P-4-D-4(0) multiplet (4639-4696 Angstrom) is blended with the N-2(+) 1N(1,3) band. It is found that in electron aurora, the brightness of this multiplet, is on average, about 0.1 of the N-2(+) 1N(0,2) total brightness. A joint optical and incoherent scatter radar study of an electron aurora event shows that the ratio is enhanced when the ionisation in the upper E-layer (140-190 km) is significant with respect to the E-layer peak below 130 km. Rayed arcs were observed on one such occasion, whereas on other occasions the auroral intensity was below the threshold of the imager. A one-dimensional electron transport model is used to estimate the cross section for production of the multiplet in electron collisions, yielding 0.18 x 10(-18) cm(2).
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- Ahlberg, Anders, et al.
(författare)
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Enigmatic Late Cretaceous high palaeo-latitude lonestones in Chukotka, northeasternmost Asia
- 2002
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Ingår i: GFF. - : Informa UK Limited. - 2000-0863 .- 1103-5897. ; 124:4, s. 197-199
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Tidskriftsartikel (refereegranskat)abstract
- Well-rounded cobbles were encountered within a low-energy restricted marine organic-rich deposit of latest Cretaceous age in Chukotka, NE Asia. The clasts are hydrodynamically incompatible with the inferred quiet depositional environment of the host sediment. Driftwood capable of tree-rafting, glacial striations, gastrolith clast clustering, and disrupting clast impact impressions typical of volcanic ejecta were absent, as were signs of traction currents. If indeed ice-rafting is responsible, this supports recent climate models and palaeobotanical data which favour seasonal marine ice cover of high northern latitudes over a wide span of boundary conditions.
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