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- Forkman, Peter, 1959, et al.
(författare)
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An uncooled very low noise Schottky diode receiver front-end for middle atmospheric ozone and carbon monoxide measurements
- 2006
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Ingår i: International Journal of Infrared and Millimeter Waves. - : Springer Science and Business Media LLC. - 0195-9271 .- 1572-9559. ; 27:1, s. 25-35
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Tidskriftsartikel (refereegranskat)abstract
- The paper describes an uncooled front-end of the Schottky diode receiver system, which may be applied for observations of middle atmospheric ozone and carbon monoxide thermal emission lines at frequencies 110.8 GHz and 115.3 GHz, respectively. The mixer of the front-end has utilized high-quality Schottky diodes that allowed us to reduce the mixer conversion loss. The combination of the mixer and an ultra-low-noise IF amplifier in the one integrated unit has resulted in double-sideband (DSB) receiver noise temperature of 260 K at a local oscillator (LO) frequency of 113.05 GHz in the instantaneous IF band from 1.7 to 2.7 GHz. This is the lowest noise temperature ever reported for an uncooled ozone receiver system with Schottky diode mixers. © 2007 Springer Science+Business Media, Inc.
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| 2. |
- Neustroev, Kirill N., et al.
(författare)
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Transferase and hydrolytic activities of the laminarinase from rhodothermus marinus and its M133A, M133C, and M133W mutants
- 2006
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Ingår i: Glycoconjugate Journal. - : Springer Science and Business Media LLC. - 0282-0080 .- 1573-4986. ; 23:08-jul, s. 501-511
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Tidskriftsartikel (refereegranskat)abstract
- Comparative studies of the transglycosylation and hydrolytic activities have been performed on the Rhodothermus marinus beta-1,3-glucanase (laminarinase) and its M133A, M133C, and M133W mutants. The M133C mutant demonstrated near 20% greater rate of transglycosylation activity in comparison with the M133A and M133W mutants that was measured by NMR quantitation of nascent beta(1-4) and beta(1-6) linkages. To obtain kinetic probes for the wild-type enzyme and Met-133 mutants, p-nitrophenyl beta-laminarin oligosaccharides of degree of polymerisation 2-8 were synthesized enzymatically. Catalytic efficiency values, k (cat)/K (m), of the laminarinase catalysed hydrolysis of these oligosaccharides suggested possibility of four negative and at least three positive binding subsites in the active site. Comparison of action patterns of the wild-type and M133C mutant in the hydrolysis of the p-nitrophenyl-beta-D-oligosac- charides indicated that the increased transglycosylation activity of the M133C mutant did not result from altered subsite affinities. The stereospecificity of the transglycosylation reaction also was unchanged in all mutants; the major transglycosylation products in hydrolysis of p-nitrophenyl laminaribioside were beta-glucopyranosyl-beta-1,3-D-glucopy- ranosyl-beta-1,3-D-glucopyranose and beta-glucopyranosyl-beta-1, 3-D-glucopyranosyl-beta-1,3-D-glucpyranosyl-beta-1,3-D- glucopyranoxside.
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| 3. |
- Bunta, Juraj, et al.
(författare)
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Solvating, manipulating, damaging, and repairing DNA in a computer
- 2007
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Ingår i: International Journal of Quantum Chemistry. - New York : Wiley. - 0020-7608 .- 1097-461X. ; 107:2, s. 279-291
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Tidskriftsartikel (refereegranskat)abstract
- This work highlights four different topics in modeling of DNA: (i) the importance of water and ions together with the structure and function of DNA; the hydration structure around the ions appears to be the determining factor in the ion coordination to DNA, as demonstrated in the results of our MD simulations; (ii) how MD simulations can be used to simulate single molecule manipulation experiments as a complement to reveal the structural dynamics of the studied biomolecules; (iii) how damaged DNA can be studied in computer simulations; and (iv) how repair of damaged DNA can be studied theoretically.
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