Authors:Rafael de Pádua Ferreira, Solange Sakata, Fernando Dutra, Patricia Di Vitta, Maria Taddei, Maria Bellini, and Júlio Marumo
Waste management plays an important role in radioactive waste volume reduction as well as lowering disposal costs and minimizing
the environment-detrimental impact. The employment of biomass in the removal of heavy metals and radioisotopes has a significant
potential in liquid waste treatment. The aim of this study is to evaluate the radioactive waste treatment by using three different
bacterial communities (BL, BS, and SS) isolated from impacted areas, removing radioisotopes and organic compounds. The best
results were obtained in the BS and BL community, isolated from the soil and a lake of a uranium mine, respectively. BS community
was able to remove 92% of the uranium and degraded 80% of tributyl phosphate and 70% of the ethyl acetate in 20 days of experiments.
BL community removed 81% of the uranium and degraded nearly 60% of the TBP and 70% of the ethyl acetate. SS community collected
from the sediment of São Sebastião channel removed 76% of the uranium and 80% of the TBP and 70% of the ethyl acetate. Both
americium and cesium were removed by all communities. In addition, the BS community showed to be more resistant to radioactive
liquid waste than the other communities. These results indicated that the BS community is the most viable for the treatment
of large volumes of radioactive liquid organic waste.
The change in the microelement content of aqueous media affects the development and the vital process of microorganisms. The
present paper treats the accumulation and the influence of the toxic elements Cd and Cu on the metabolic processes proceeding
in bacterial communities. To trace the dynamics of one of the basic metabolic processes, oxygen consumption was measured polarographically.
For tracing the accumulation of the additionally included Cd and Cu in the experimental volume of water, the nondestructive
method of neutron activation analysis was used. The results show a correspondence between the inclusion of elements and the
change in the breathing as a function of the additionally included concentration of the investigated microelements. The more
toxic effect of Cd on the oxygen consumption is noticeable.
To analyze the rhizosphere bacterial communities in
wetlands, the total lipid content was extracted from a peat soil and 4 abundant
wetland plant roots (
separated phospholipid fraction was further fractionated and derivatized prior
to gas chromatography-mass spectrometry (GC-MS) measurement. In the evaluation
only the bacteria-specific fatty acids were used in order to neglect fatty acid
information derived from plant root cells. Based on these analyses, a high
level bacterial concentration was demonstrated in the rhizosphere, and the
relative occurrence of aerobe and anaerobe, Gram positive and negative
bacteria, methanotrophs, sulphate reducers and Actinobacteria was determined.
Through the PLFA analysis the study of bacteria regardless of culturability was
Authors:I. Baidoo, D. Sarfo, L. Sarsah, M. Appenteng, E. Kaka, N. Opata, and Y. Serfor-Armah
This research work aimed at studying the metal content of water and tilapia fish sample, Oreochromis spp., from a wastewater-fed pond around the University of Cape Coast community using instrumental neutron activation analysis.
The metals studied were Al, As, Ca, Co, Cr, Cu, Fe, K, Mg, Mn, Na, V and Zn. In the water samples the order of elemental concentrations
at sampling point 1, in μg/g, was K (75.96 ± 0.92), Na (18.52 ± 0.35), Al (6.00 ± 0.89), Mn (3.28 ± 0.44), As (3.08 ± 0.40),
Mg (1.56 ± 0.17), Ca (0.70 ± 0.08), Cu (0.54 ± 0.08) and V (0.04 ± 0.01). Co, Cr, Fe and Zn were below detection limits of
INAA. The order of elemental concentrations in the water at point 2 was as follows: Na (4.99 ± 0.14), K (4.82 ± 0.89), Mn
(4.40 ± 0.53), Mg (2.92 ± 0.37), Al (1.98 ± 0.21), As (0.69 ± 0.10), Ca (0.24 ± 0.07) and V (0.23 ± 0.06) with Co, Cr, Cu,
Fe and Zn falling below the detection limit of INAA. The concentrations recorded for Al, As, Cu and Mn in the water samples
were all above WHO permissible limits. The mean levels of heavy metals in the soft tissue of tilapia was of the order: K > Mg > Fe > Ca > Na > Al > Mn > Zn > V > Cu > Cr > Co.
Arsenic was below detection limit. The transfer factor values calculated for the metals Al, Ca, K, Mg, Mn, Na and V were all
greater than one indicating movement of metals from the water column to the tilapia species. The hazard index (HI) calculated
for Al, Fe, Mn and V suggested possible occurrence of adverse health effects (HI > 1) where as the HI value obtained for Cr,
Cu and Zn (i.e., HI < 1) suggested unlikely adverse effects occurring.
Reference materials are necessary to improve or to maintain a high quality of analysis. To avoid bias as far as possible, the BCR certifies reference materials on the basis of results of different methods used by different laboratories. A proper selection of good methods and laboratories makes it possible to obtain excellent agreement and narrow confidence intervals. Neutron activation techniques are suited for many key elements; their results are in good agreement with those of other techniques.
Authors:Tibor Szili-Kovács, Ágnes Bárány, Anna Füzy, Tünde Takács, Gergely Krett, Ramóna Kovács, and Andrea Borsodi
, A. , Márialigeti , K. & Borsodi , A.K.
2014 . Metabolic activity and genetic diversity of microbial communities inhabiting the rhizosphere of halophyton plants . Acta Microbiologica et Immunologica Hungarica 61 . 347 – 361
Authors:Márton Mucsi, Péter Csontos, Andrea Borsodi, Gergely Krett, Orsolya Gazdag, and Tibor Szili-Kovács
. , Szili-Kovács , T. , Krett , G. , Füzy , A. , Márialigeti , K. & Borsodi , A.
2014 . Metabolic activity and genetic diversity of microbial communities inhabiting the rhizosphere of halophyton plants . Acta microbiologica et
. Bender Environmental Science & Technology 2015 , 49 , 8602 – 8610
“ Selective enrichment establishes a stable performing community for microbial electrosynthesis of acetate from CO 2 ” S. A. Patil , J. B. A. Arends , I