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1.
I. Grebenščikov E. Hoffmann P. Metzner F. Mechelke K. Mothes A. Bail 《TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik》1953,23(1-2):61-63
Ohne Zusammenfassung 相似文献
2.
E. Günther K. Skiebe W. Mante Hagemann P. Metzner K. Gröber Ramshorn Nover F. Scholz Hanson Keppler 《TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik》1964,34(6-7):292-296
Ohne Zusammenfassung 相似文献
3.
W. Kreil Unger Hans Rundfeldt P. Metzner G. Schönberg K. Naumann Nover R. Schiemann H. Grimm P. Heriwig 《TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik》1965,35(8):374-376
Ohne Zusammenfassung 相似文献
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Elizabeth P. St. John Birgitte B. Simen Gregory S. Turenchalk Michael S. Braverman Isabella Abbate Jeroen Aerssens Olivier Bouchez Christian Gabriel Jacques Izopet Karolin Meixenberger Francesca Di Giallonardo Ralph Schlapbach Roger Paredes James Sakwa Gudrun G. Schmitz-Agheguian Alexander Thielen Martin Victor Karin J. Metzner Martin P. D?umer HIV- Alpha Study Group 《PloS one》2016,11(1)
6.
The csiD-ygaF-gabDTP region in the Escherichia coli genome represents a cluster of sigma S-controlled genes. Here, we investigated promoter structures, sigma factor dependencies, potential co-regulation and environmental regulatory patterns for all of these genes. We find that this region constitutes a complex operon with expression being controlled by three differentially regulated promoters: (i) csiDp, which affects the expression of all five genes, is cAMP-CRP/sigma S-dependent and activated exclusively upon carbon starvation and stationary phase; (ii) gabDp1, which is sigma S-dependent and exhibits multiple stress induction like sigma S itself; and (iii) gabDp2[previously suggested by Schneider, B.L., Ruback, S., Kiupakis, A.K., Kasbarian, H., Pybus, C., and Reitzer, L. (2002) J. Bacteriol. 184: 6976-6986], which appears to be Nac/sigma 70-controlled and to respond to poor nitrogen sources. In addition, we identify a novel repressor, CsiR, which modulates csiDp activity in a temporal manner during early stationary phase. Finally, we propose a physiological role for sigma S-controlled GabT/D-mediated gamma-aminobutyrate (GABA) catabolism and glutamate accumulation in general stress adaptation. This physiological role is reflected by the activation of the operon-internal gabDp1 promoter under the different conditions that also induce sigma S, which include shifts to acidic pH or high osmolarity as well as starvation or stationary phase. 相似文献
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E. J. Bormann M. Leißner M. Roth B. Beer K. Metzner 《Applied microbiology and biotechnology》1998,50(5):604-607
Polyhydroxybutyrate (PHB) was produced by Ralstonia eutropha DSM 11348 (formerly Alicaligenes eutrophus) in media containing 20–30 g l−1 casein peptone or casamino acids as sole sources of nitrogen. In fermentations using media based on casein peptone, permanent
growth up to a cell dry mass of 65 g l−1 was observed. PHB accumulated in cells up to 60%–80% of dry weight. The lowest yields were found in media without any trace
elements or with casamino acids added only. The residual cell dry masses were limited to 10–15 g l−1 and did not contain PHB. The highest productivity amounted to 1.2 g PHB l−1 h−1. The mean molecular mass of the biopolymer was determined as 750 kDa. The proportion of polyhydroxyvalerate was less than
0.2% in PHB. The bioprocess was scaled up to a 300-l plant. During a fermentation time of 39 h the cells accumulated PHB to
78% w/w. The productivity was 0.98 g PHB l−1 h1.
Received: 8 July 1998 / Accepted: 26 August 1998 相似文献
10.
How animals, including mammals, can respond to and utilize the direction and intensity of the Earth’s magnetic field for orientation and navigation is contentious. In this study, we experimentally tested whether the Chinese Noctule, Nyctalus plancyi (Vespertilionidae) can sense magnetic field strengths that were even lower than those of the present-day geomagnetic field. Such field strengths occurred during geomagnetic excursions or polarity reversals and thus may have played an important role in the evolution of a magnetic sense. We found that in a present-day local geomagnetic field, the bats showed a clear preference for positioning themselves at the magnetic north. As the field intensity decreased to only 1/5th of the natural intensity (i.e., 10 μT; the lowest field strength tested here), the bats still responded by positioning themselves at the magnetic north. When the field polarity was artificially reversed, the bats still preferred the new magnetic north, even at the lowest field strength tested (10 μT), despite the fact that the artificial field orientation was opposite to the natural geomagnetic field (P<0.05). Hence, N. plancyi is able to detect the direction of a magnetic field even at 1/5th of the present-day field strength. This high sensitivity to magnetic fields may explain how magnetic orientation could have evolved in bats even as the Earth’s magnetic field strength varied and the polarity reversed tens of times over the past fifty million years. 相似文献