451. |
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452. |
- Jonsson, Anders P, 1954-
(författare)
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Entropy, Free Energy and the Creation of Order out of Chaos
- 2016
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Ingår i: Society’s steering systems – a Friend book to Inga Carlman<em> </em>. - Östersund : Avdelingen för Ekoteknik och Hålbart Byggande. - 9789188025975 ; , s. 57-73
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Bokkapitel (övrigt vetenskapligt/konstnärligt)
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453. |
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454. |
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455. |
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456. |
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457. |
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458. |
- Jonsson, Anders, et al.
(författare)
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Quantitative PCR shows propagation of Plasmodiophora brassicae in Swedish long term field trials
- 2016
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Ingår i: European Journal of Plant Pathology. - : Springer Science and Business Media LLC. - 0929-1873 .- 1573-8469. ; 145, s. 573-581
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Tidskriftsartikel (refereegranskat)abstract
- Clubroot (Plasmodiophora brassicae) is a serious soil-borne disease in brassica crops world-wide. We report on a time series of soil samples from Swedish long-term fertility trials started in 1957, 1963 and 1966, which were analyzed for the amount ofP. brassicaeDNA. The crop rotations included a brassica crop every 4 or 6years. All experimental sites with a 4-year rotation of oilseed rape, except one with calcium carbonate in the soil profile, showed high (>1000fg DNA g−1soil) levels ofP. brassicaeDNA after 9, 11 and 12 rotations. In contrast, detectable levels (>5fg DNA g−1soil) ofP. brassicaewere found only at one of five sites with a 6-year rotation of spring oilseed rape. In years with high levels ofP. brassicaeDNA, low yield was reported and a subsequent decline inP. brassicaeDNA in soil was observed. Different NPK (nitrogen/phosphorus/potassium) fertiliser regimes resulted in similarP. brassicaeDNA levels. The robustness and reliability of the method applied was verified by analyses of soil from individual plots compared with a mixture of plots and by repeated analyses of selected samples, which showed thatP. brassicaeDNA remained stable during dry storage.
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459. |
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460. |
- Jonsson, Anders, et al.
(författare)
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Reduced activity of glutamine synthetase in Rhodospirillum rubrum mutants lacking the adenylyltransferase GlnE
- 2009
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Ingår i: Research in Microbiology. - : Elsevier BV. - 0923-2508 .- 1769-7123. ; 160:8, s. 581-4
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Tidskriftsartikel (refereegranskat)abstract
- In the nitrogen-fixing bacterium Rhodospirillum rubrum, the GlnE adenylyltransferase (encoded by glnE) catalyzes reversible adenylylation of glutamine synthetase, thereby regulating nitrogen assimilation. We have generated glnE mutant strains that are unable to adenylylate glutamine synthetase (GS). Surprisingly, the activity of GS was lower in the mutants than in the wild type, even when grown in nitrogen-fixing conditions. Our results support the proposal that R. rubrum can only cope with the absence of an adenylylation system in the presence of lowered GS expression or activity. In general terms, this report also provides further support for the central role of GS in bacterial metabolism.
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