English   español  
Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/162675
Share/Impact:
Statistics
logo share SHARE   Add this article to your Mendeley library MendeleyBASE
Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar a otros formatos:

Title

Aging and Respiration in the Marine Bacteria, Pseudomonas nautica

AuthorsRomero-Kutzner, V.; Packard, Theodore T. ; Berdalet, Elisa ; Roy, Sylvie; Gagné, J.-P; Gómez, May
Issue DateJul-2016
PublisherUniversidad de Alicante
CitationLibro de resúmenes : V Simposio Internacional de Ciencias del Mar: 268-269 (2016)
AbstractThe effect of aging and substrate limitation on respiratory metabolism was comparedd during two different physiological states of acetate-grown Pseudomonas nautica cultures. In this study, we analyze 30 h and 170 h time-course experiments in which cell-protein, acetate, respiratory CO2 production (RCO2) and respiratory O2 consumption (RO2) were measured and respiratory quotients (RQs= RCO2/RO2) were calculated. RQs are commonly used as a constant, over a range of 0.8 to 1, in ocean studies, to evaluate mmaany factors such as the autotrophic-heterotrophic nature of the ocean and the vertical carbon flux. In the laboratory we observed that RQ can rise an order of magnitude above this constant. In the early well-fed growth sttage of our short term experiment RO2 rates were higher than RCO2 rates (RQ=0,4), nevertheless in senescence and under limited carbon-substrate conditions this ratio shifted uupp to 9,6. We conclude that the culture aging and substrate limitations affected the RQ of P. nautica culttuure, in a way that the use of a consttant RQ for biological calculations is inadvisable. Therefore, these results argue that oceanic measurements which are influenced by bacterial metabolism and nutrient limitation needd to be reconsidered in face of this strong RQ variability. Lastly, because our microbial biomass remained relatively constant in face of nutrient-limitation, our results suggest a link between substrate deprivation, senescence and possibly, longevity
DescriptionV Simposio Internacional de Ciencias del Mar, 20-22 July 2016, Alicante.-- 2 pages, 2 figures
Publisher version (URL)http://rua.ua.es/dspace/handle/10045/59210
URIhttp://hdl.handle.net/10261/162675
Identifiersisbn: 978-84-16724-16-1
Appears in Collections:(ICM) Libros y partes de libros
Files in This Item:
File Description SizeFormat 
Romero_et_al_2016.pdf245,94 kBAdobe PDFThumbnail
View/Open
Show full item record
Review this work
 


WARNING: Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.