| 1. |
- Dunham, I, et al.
(författare)
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The DNA sequence of human chromosome 22
- 1999
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Ingår i: Nature. - : Springer Science and Business Media LLC. - 0028-0836 .- 1476-4687. ; 402:6761, s. 489-495
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Tidskriftsartikel (refereegranskat)
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| 2. |
- Miller, T. C., et al.
(författare)
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Particle astrophysics in antarctica
- 1996
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Ingår i: International School of Cosmic Ray Astrophysics: 10th Course: Toward the Millennium in Astrophysics: Problems and Prospects 16-26 Jun 1996. Erice, Italy. ; , s. 157-166
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Konferensbidrag (refereegranskat)
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| 3. |
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| 4. |
- Valegard, K, et al.
(författare)
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Structure of a cephalosporin synthase
- 1998
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Ingår i: NATURE. - : MACMILLAN MAGAZINES LTD. - 0028-0836. ; 394:6695, s. 805-809
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Tidskriftsartikel (refereegranskat)abstract
- Penicillins and cephalosporins are among the most widely used therapeutic agents. These antibiotics are produced from fermentation-derived materials as their chemical synthesis is not commercially viable. Unconventional steps in their biosynthesis are cat
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| 5. |
- Kalli, K., et al.
(författare)
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Room temperature hydrogen gas detection with optically thin palladium films on silicon oxide using photomodulated thermoreflectance
- 1999
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Ingår i: AIP Conference Proceedings. - : American Institute of Physics (AIP). - 0094-243X .- 1551-7616. ; 463, s. 220-222
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Tidskriftsartikel (refereegranskat)abstract
- The sensitivity of various thicknesses of optically thin film Pd layers evaporated into a silicon oxide substrate is investigated in the presence of a hydrogen/air atmosphere at room temperature. The magnitude of the resulting reflectivity change is measured using an excite-probe technique, through laser excited photothermal modulation of a probe beam. Data indicates that concentrations of 0.1% hydrogen in a balanced air mixture and at room temperature may be measured with. an 8nm Pd film. Inhomogeneities in the Pd layers lead to anomalous behavior.
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| 6. |
- Kalli, K, et al.
(författare)
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Temperature-induced reflectivity changes and activation of hydrogen sensitive optically thin palladium films on silicon oxide
- 1998
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Ingår i: Review of Scientific Instruments. - : American Institute of Physics (AIP). - 0034-6748 .- 1089-7623. ; 69:9, s. 3331-3338
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Tidskriftsartikel (refereegranskat)abstract
- The optical properties of several thin metal film palladium-silicon oxide structures are examined at room temperature before and after annealing to 200 degrees C and also at 90 degrees C-in all cases in the presence of hydrogen gas. Multicycling sample activation is shown to occur iii the presence of hydrogen at room temperature with an increase in reflectivity on exposure to hydrogen, in contrast to thicker 80 Angstrom films. The reflectivity change increases with increasing film thickness (1-10 Angstrom). The surface activation at room temperature, before and after annealing to 200 degrees C, is compared with the performance at 90 degrees C, where it is shown that heat treatment strongly influences the behavior of the metal film.
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| 7. |
- Lloyd, MD, et al.
(författare)
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Studies on the active site of deacetoxycephalosporin C synthase
- 1999
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Ingår i: JOURNAL OF MOLECULAR BIOLOGY. - : ACADEMIC PRESS LTD. - 0022-2836. ; 287:5, s. 943-960
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Tidskriftsartikel (refereegranskat)abstract
- The Fe(II) and 2-oxogolutarate-dependent dioxygenase deacetoxycephalosporin C synthase (DAOCS) from Streptomyces clavuligerus was expressed at ca 25% of total soluble protein in Escherichia coli and purified by an efficient large-scale procedure. Purified
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| 8. |
- Lloyd-Spets, Anita, et al.
(författare)
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Current status of silicon carbide based high-temperature gas sensors
- 1999
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Ingår i: IEEE Transactions on Electron Devices. - 0018-9383 .- 1557-9646. ; 46:3, s. 561-566
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Tidskriftsartikel (refereegranskat)abstract
- Silicon carbide (SIC) based field effect gas sensors can be operated at very high temperatures. Catalytic metal-insulator-silicon carbide (MISiC) Schottky diodes respond very fast to a change between a reducing and an oxidizing atmosphere, and cylinder-specific combustion engine monitoring has been demonstrated. The sensors have also been suggested for high-temperature electronic nose applications. Car applications and other harsh environments put very strong requirements on the long-term stability of the sensors. Here rye review the current status of the field of SiC based Schottkg diode gas sensors with emphasis on the work in our group. Basic work on understanding of the detection mechanism and the influence of interfacial layers on the long-term stability of the sensors is reviewed, The direction of future research and device development in our group is also discussed.
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| 9. |
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| 10. |
- Schmeisser, D, et al.
(författare)
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Dipole moment of nanoparticles at interfaces
- 1999
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Ingår i: Physical Review Letters. - : American Physical Society. - 0031-9007 .- 1079-7114. ; 83:2, s. 380-383
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Tidskriftsartikel (refereegranskat)abstract
- The properties of heterogeneous interfaces are modified essentially by the presence of nanoparticles. We provide a model and give spectroscopic evidence that nanoscale clusters exist which have a metallic core and a shell of an almost perfect oxide. Such clusters produce a large dipole moment which manifests itself as shifts in core levels as seen by photoelectron spectroscopy, as well as non-Ohmic rectifying behavior in the device electrical properties.
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