Biomass production and studies on Rhodopseudomonas palustris grown in an outdoor, temperature controlled, underwater tubular photobioreactor

Autor: Angelo Sacchi, Pietro Carlozzi
Rok vydání: 2001
Předmět:
Zdroj: Journal of biotechnology 88 (2001): 239–249. doi:10.1016/S0168-1656(01)00280-2
info:cnr-pdr/source/autori:Carlozzi P. 1, Sacchi A. 1/titolo:Biomass production and studies on Rhodopseudomonas palustris grown in an outdoor, temperature controlled, underwater tubular photobioreactor./doi:10.1016%2FS0168-1656(01)00280-2/rivista:Journal of biotechnology/anno:2001/pagina_da:239/pagina_a:249/intervallo_pagine:239–249/volume:88
ISSN: 0168-1656
DOI: 10.1016/S0168-1656(01)00280-2
Popis: A temperature controlled underwater tubular photobioreactor was studied for 6 months in outdoor conditions to determine biomass production of Rhodopseudomonas palustris 42OL. Biomass output rate was very high during the study period. In July, productivity was about 75.0 g reactor(-1) d(-1) for a short period (5 days). The biomass yield averaged 0.7 g biomass dry weight (d.w.)xg acetic acid(-1). We also obtained a mean photosynthetic efficiency of 7.6% in winter and 7.1% in summer. Biomasses rich in pigments and a biodegradable thermoplastic polymer [poly-beta-hydroxybutyrate (PHB)] were obtained. During the summer, PHB was about 4.0% of the biomass d.w. The bacteriochlorophyll/carotenoid ratio was lower at midday than either in the morning or in the evening. The reduction in this ratio may have been a response of the Rhodopseudomonas cells to high irradiance (about 900 W m(-2)). A reduced rate of protein synthesis continued even in the dark. PHB and carbohydrates, synthesized in excess during the day, were used as substrates for night protein synthesis.
Databáze: OpenAIRE
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