TY  - JOUR
A1  - Sree, K. Sowjanya
A1  - Keresztes, Aron
A1  - Müller-Röber, Bernd
A1  - Brandt, Ronny
A1  - Eberius, Matthias
A1  - Fischer, Wolfgang
A1  - Appenroth, Klaus-J.
T1  - Phytotoxicity of cobalt ions on the duckweed Lemna minor - Morphology, ion uptake, and starch accumulation
JF  - Chemosphere : chemistry, biology and toxicology as related to environmental problems
N2  - Cobalt (Co2+) inhibits vegetative growth of Lemna minor gradually from 1 mu M to 100 mu M. Fronds accumulated up to 21 mg Co2+ g(-1) dry weight at 10 mu M external Co2+ indicating hyperaccumulation. Interestingly, accumulation of Co2+ did not decrease the iron (Fe) content in fronds, highlighting L. minor as a suitable system for studying effects of Co2+ undisturbed by Fe deficiency symptoms unlike most other plants. Digital image analysis revealed the size distribution of fronds after Co2+ treatment and also a reduction in pigmentation of newly formed daughter fronds unlike the mother fronds during the 7-day treatment. Neither chlorophyll nor photosystem II fluorescence changed significantly during the initial 4 d, indicating effective photosynthesis. During the later phase of the 7-day treatment, however, chlorophyll content and photosynthetic efficiency decreased in the Co2+-treated daughter fronds, indicating that Co2+ inhibits the biosynthesis of chlorophyll rather than leading to the destruction of pre-existing pigment molecules. In addition, during the first 4 d of Co2+ treatment starch accumulated in the fronds and led to the transition of chloroplasts to chloro-amyloplasts and amylo-chloroplasts, while starch levels strongly decreased thereafter. (C) 2015 Elsevier Ltd. All rights reserved.
KW  - Chloroplast
KW  - Cobalt
KW  - Lemnaceae
KW  - Lemna minor
KW  - Phytotoxicity
KW  - Starch accumulation
Y1  - 2015
U6  - https://doi.org/10.1016/j.chemosphere.2015.03.008
SN  - 0045-6535
SN  - 1879-1298
VL  - 131
SP  - 149
EP  - 156
PB  - Elsevier
CY  - Oxford
ER  - 
TY  - JOUR
A1  - Mondal, Suvendu Sekhar
A1  - Behrens, Karsten
A1  - Kelling, Alexandra
A1  - Nabein, Hans-Peter
A1  - Schilde, Uwe
A1  - Holdt, Hans-Jürgen
T1  - Two Cd-II/Co-II-Imidazolate Coordination Polymers: Syntheses, Crystal Structures, Stabilities, and Luminescent/Magnetic Properties
JF  - Zeitschrift für anorganische und allgemeine Chemie
N2  - Cadmium(II) based 2D coordination polymer [Cd(L1)(2)(DMF)(2)] (1) (L1 = 4,5-dicyano-2-methylimidazolate, DMF = N,N'-dimethylformamide) and 2D cobalt(II)-imidazolate framework [Co(L3)(4)] (2) (L3 = 4,5-diamide-2-ethoxyimidazolate) were synthesized under solvothermal reaction conditions. The materials were characterized by elemental analysis, IR spectroscopy, thermogravimetric analysis, powder X-ray diffraction measurement (PXRD) and single-crystal X-ray diffraction. Compound 1 has hexacoordinate Cd-II ions and forms a zigzag chain-like coordination polymer structure, whereas compound 2 exhibits a 2D square grid type structure. The thermal stability analysis reveals that 2 showed an exceptional thermal stability up to 360 degrees C. Also, 2 maintained its fully crystalline integrity in boiling water as confirmed by PXRD. The solid state luminescent property of 1 was not observed at room temperature. Compound 2 showed an independent high spin central Co-II atom.
KW  - Cobalt
KW  - Cadmium
KW  - Coordination polymers
KW  - Crystal structures
KW  - Imidazole
Y1  - 2015
U6  - https://doi.org/10.1002/zaac.201500526
SN  - 0044-2313
SN  - 1521-3749
VL  - 641
IS  - 11
SP  - 1991
EP  - 1997
PB  - Wiley-VCH
CY  - Weinheim
ER  -