Impacts of different concentrations of Copper and Zinc on in vitro responses of Azotobacter chroococum in biomass and nitrogen fixing outputs
DOI:
https://doi.org/10.5132/eec.2018.01.09Resumo
The responses of Azotobacter chroococum for copper and zinc were surveyed in this study. The impacts of different concentrations of copper and zinc on biomass formation and nitrogen fixation of Azotobacter chroococum were investigated. Batch trials were performed under continuous airflow using Jensen’s nitrogen free broth, at ambient room temperatures for seven days. Maximum biomass yields of 0.068 OD600 units and 0.131 OD600 units were recorded at 25 mg L-1 and 200 mg L-1 for copper and zinc amended trials, respectively. Maximum nitrogen fixations of 1.446 ppm and 1.507 ppm were also recorded for copper and zinc amended trials at 12.5 mg L-1, respectively. Statistical analysis revealed strong significant correlations between metal concentrations and nitrogen fixation for copper and zinc amended trials, respectively. Leudeking-Piret modeling showed that nitrogen fixations of Azotobacter chroococum in both copper and zinc amended trials were associated with biomass density.
Downloads
Downloads
Publicado
Como Citar
Edição
Seção
Licença
Copyright © 2006 ECOTOX-BRAZIL
Copyright notice: It is a condition for publication that manuscripts submitted to this journal have not yet been published and will not be simultaneously submitted or published of elsewhere. By submitting a manuscript, the authors agree that copyright for their article is transferred to the Sociedade Brasileira de Ecotoxicologia (ECOTOX-Brazil) if and when the article is accepted for publication. The copyright covers the exclusive rights to reproduce and distribute articles, including reprints, photographic reproductions or any other reproduction of a similar nature, including translations. No part of this publication may be reproduced, stored in a retrieval system or transmitted in any form or by any means, electronic, mechanical, photocopying, recording or otherwise, without permission of the publisher.
Notice: While every effort is made by the JBSE, editors and editorial board to see that no inaccurate or misleading data, opinions or statements appear in this journal, they wish to make it clear that the contents of the articles and advertisements published herein are the sole responsibility of the contributors or advertisers concerned. Accordingly, the JBSE, the editorial board and editors and their respective employees, officers and agents accept no responsibility or liability whatsoever for the consequences of any inaccurate or misleading data, opinion or statement.
