TY  - INPR
A1  - Wannicke, Nicola
A1  - Endres, S.
A1  - Engel, A.
A1  - Grossart, Hans-Peter
A1  - Nausch, M.
A1  - Unger, J.
A1  - Voss, Martin
T1  - Response of nodularia spumigena to pCO(2) - Part 1: Growth, production and nitrogen cycling
T2  - Biogeosciences
N2  - Heterocystous cyanobacteria of the genus Nodularia form extensive blooms in the Baltic Sea and contribute substantially to the total annual primary production. Moreover, they dispense a large fraction of new nitrogen to the ecosystem when inorganic nitrogen concentration in summer is low. Thus, it is of ecological importance to know how Nodularia will react to future environmental changes, in particular to increasing carbon dioxide (CO2) concentrations and what consequences there might arise for cycling of organic matter in the Baltic Sea. Here, we determined carbon (C) and dinitrogen (N-2) fixation rates, growth, elemental stoichiometry of particulate organic matter and nitrogen turnover in batch cultures of the heterocystous cyanobacterium Nodularia spumigena under low (median 315 mu atm), mid (median 353 mu atm), and high (median 548 mu atm) CO2 concentrations. Our results demonstrate an overall stimulating effect of rising pCO(2) on C and N-2 fixation, as well as on cell growth. An increase in pCO(2) during incubation days 0 to 9 resulted in an elevation in growth rate by 84 +/- 38% (low vs. high pCO(2)) and 40 +/- 25% (mid vs. high pCO(2)), as well as in N-2 fixation by 93 +/- 35% and 38 +/- 1%, respectively. C uptake rates showed high standard deviations within treatments and in between sampling days. Nevertheless, C fixation in the high pCO(2) treatment was elevated compared to the other two treatments by 97% (high vs. low) and 44% (high vs. mid) at day 0 and day 3, but this effect diminished afterwards. Additionally, elevation in carbon to nitrogen and nitrogen to phosphorus ratios of the particulate biomass formed (POC : POP and PON : POP) was observed at high pCO(2). Our findings suggest that rising pCO(2) stimulates the growth of heterocystous diazotrophic cyanobacteria, in a similar way as reported for the non-heterocystous diazotroph Trichodesmium. Implications for biogeochemical cycling and food web dynamics, as well as ecological and socio-economical aspects in the Baltic Sea are discussed.
Y1  - 2012
U6  - https://doi.org/10.5194/bg-9-2973-2012
SN  - 1726-4170
VL  - 9
IS  - 8
SP  - 2973
EP  - 2988
PB  - Copernicus
CY  - Göttingen
ER  - 
TY  - INPR
A1  - Lenhard, Michael
T1  - Plant Growth: Jogging the Cell Cycle with JAG
T2  - Current biology
Y1  - 2012
U6  - https://doi.org/10.1016/j.cub.2012.07.033
SN  - 0960-9822
VL  - 22
IS  - 19
SP  - R838
EP  - R840
PB  - Cell Press
CY  - Cambridge
ER  - 
TY  - INPR
A1  - Kopetzki, Daniel
A1  - Seeberger, Peter H.
T1  - Photochemistry in fight against malaria
T2  - Nachrichten aus der Chemie : Zeitschrift der Gesellschaft Deutscher Chemiker
Y1  - 2012
SN  - 1439-9598
SN  - 1868-0054
VL  - 60
IS  - 7-8
SP  - 714
EP  - 717
PB  - Ges. Dt. Chemiker
CY  - Frankfurt, Main
ER  - 
TY  - INPR
A1  - Baret, Jean-Christophe
A1  - Belder, Detlev
A1  - Bier, Frank Fabian
A1  - Cao, Jialan
A1  - Gruschke, Oliver
A1  - Hardt, Steffen
A1  - Kirschbaum, Michael
A1  - Koehler, J. Michael
A1  - Schumacher, Soeren
A1  - Urban, G. A.
A1  - Viefhues, Martina
T1  - Contributors to the 10th Anniversary Germany issue
T2  - LAB on a chip : miniaturisation for chemistry and biology
Y1  - 2012
U6  - https://doi.org/10.1039/c1lc90139g
SN  - 1473-0197
VL  - 12
IS  - 3
SP  - 419
EP  - 421
PB  - Royal Society of Chemistry
CY  - Cambridge
ER  - 
TY  - INPR
A1  - Lenhard, Michael
T1  - All's well that ends well arresting cell proliferation in leaves
T2  - Developmental cell
N2  - The transition from cell proliferation to cell expansion is critical for determining leaf size. Andriankaja et al. (2012) demonstrate that in leaves of dicotyledonous plants, a basal proliferation zone is maintained for several days before abruptly disappearing, and that chloroplast differentiation is required to trigger the onset of cell expansion.
Y1  - 2012
U6  - https://doi.org/10.1016/j.devcel.2011.12.004
SN  - 1534-5807
VL  - 22
IS  - 1
SP  - 9
EP  - 11
PB  - Cell Press
CY  - Cambridge
ER  -