Assimilation of various organic carbon sources by Haematococcus strains

2009 ◽  
Vol 57 (2) ◽  
pp. 231-237
Author(s):  
M. Zych ◽  
A. Stolarczyk ◽  
K. Maca ◽  
A. Banaś ◽  
K. Termińska-Pabis ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Organic Compounds ◽  
Present Experiment ◽  
Carbon Sources ◽  
Growth Conditions ◽  
Mixotrophic Growth ◽  
Naturally Occurring ◽  
Organic Carbon Sources ◽  
Secondary Carotenoids ◽  
Colour Changes

Differences in the assimilation of individual organic compounds (5 mM sugars and L-asparagine) under mixotrophic growth conditions were described for three naturally occurring Haematococcus strains.The effects of assimilation were measured by the growth intensity and size of algal cells, and the effect of colour changes in the cultures was observed. Some compounds caused the cell colouration to change from green to yellow, being the result of chlorophyll disappearance and the accumulation of yellow secondary carotenoids. In the present experiment none of the cultures turned red, thus excluding the intense accumulation of the commercially interesting carotenoid, astaxanthin.

Promoting Influence of Organic Carbon Source on Chromate Reduction by Bacillus sp.

2012 ◽  
Vol 610-613 ◽  
pp. 1789-1794
Author(s):  
Wei Hua Xu ◽  
Yun Guo Liu ◽  
Guang Ming Zeng ◽  
Xin Li ◽  
Wei Zhang
Keyword(s):  
Organic Carbon ◽  
Redox Potential ◽  
Liquid Medium ◽  
Organic Compounds ◽  
Liquid Culture ◽  
Carbon Sources ◽  
Chromate Reduction ◽  
Bacillus Sp ◽  
Organic Carbon Sources ◽  
Organic Carbon Source

The effect of different organic carbon sources on Cr(Ⅵ) reduction by Bacillus sp. was investigated. Three organic compounds, malate, succinate and glucose were tested in Cr(Ⅵ) reduction experiments. The results demonstrated that three organic compounds all significantly enhanced Cr(Ⅵ) reduction. The enhancing degree of these three organic compounds was observed as malate>glucose>succinate, although the cell growth in succinate-added medium was similar to that in malate-added medium and was apparently higher than that in glucose-added medium. Addition of glucose resulted in decrease of pH and increase of redox potential, while addition of malate or succinate resulted in increase of pH and decrease of redox potential during Cr(Ⅵ) reduction. Cr(Ⅵ) was reduced by liquid culture metabolite when glucose was added in liquid medium, but not reduced by liquid culture metabolite when malate or succinate was applied in liquid medium for bacterial cultivation.

Metabolism Peculiarities of Bacteria of the Genus Sulfobacillus

2007 ◽  
Vol 20-21 ◽  
pp. 469-472
Author(s):  
Anna E. Zhuravleva ◽  
I.A. Tsaplina ◽  
A.D. Ismailov ◽  
L.M. Zakharchuk ◽  
G.I. Karavaiko
Keyword(s):  
Organic Compounds ◽  
Carbon Sources ◽  
Optimal Growth ◽  
Growth Conditions ◽  
Pentose Phosphate ◽  
Mixotrophic Growth ◽  
Moderately Thermophilic ◽  
Acidophilic Bacteria ◽  
Autotrophic Metabolism ◽  
Minerals Processing

The genus Sulfobacillus includes moderately thermophilic and thermotolerant acidophilic bacteria, which prefer mixotrophic growth conditions. These organisms are S. thermosulfidooxidans 1269Т, S. sibiricus N1Т and S. thermotolerans Kr1Т. The simultaneous presence of organic (for example yeast extract) and inorganic energy sources is essential for optimal growth. Carbon sources are both CO2 and organic compounds. During their mixotrophic growth, the basic pathways of carbohydrate catabolism of sulfobacilli are those of glycolysis, oxidative pentose phosphate and Entner–Doudorov (excepting strain N1). Assimilation of CO2 is carried out both auto- and heterotrophically. Final stages of oxidation of organic substances serve for cell biosynthesis. Bacteria are able to switch to organo- and autotrophic metabolism. At that the enzyme activities of pentose phosphate pathway are not detected. The cycle of tricarboxylic acids is disrupted at the level of 2-oxoglutarate dehydrogenase. The glyoxylate bypass is absent. The maximal protein and ATP values and high intensity of respiration in S. thermosulfidooxidans, S. sibiricus and S. thermotolerans cultures were determined under mixotrophic conditions. Studied strains due to their flexible carbon and energetic metabolism together with other microorganisms of communities (leptospirilli and archaea) participate in sulfide minerals processing at 40-450C without organic compounds supplement.

Role of Organic Carbon Sources and Sulfate in Controlling Net Methylmercury Production in Riverbank Sediments of the South River, VA (USA)

2017 ◽  
Vol 35 (1) ◽  
pp. 1-14 ◽  
Author(s):  
Krista M. A. Paulson ◽  
Carol J. Ptacek ◽  
David W. Blowes ◽  
W. Douglas Gould ◽  
Jing Ma ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Carbon Sources ◽  
The South ◽  
Organic Carbon Sources ◽  
Methylmercury Production

scholarly journals Modelling landscape controls on dissolved organic carbon sources and fluxes to streams

2014 ◽  
Vol 122 (2-3) ◽  
pp. 361-374 ◽  
Author(s):  
J. J. Dick ◽  
D. Tetzlaff ◽  
C. Birkel ◽  
C. Soulsby
Keyword(s):  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Carbon Sources ◽  
Organic Carbon Sources

Analysis of organic carbon sources in tropical seagrass fish: a case study of the east coast of Hainan Province

2019 ◽  
Vol 15 (8-9) ◽  
pp. 513-522 ◽  
Author(s):  
Jianguo Du ◽  
Zehao Chen ◽  
Meiling Xie ◽  
Mingru Chen ◽  
Xinqing Zheng ◽  
...  
Keyword(s):  
Organic Carbon ◽  
East Coast ◽  
Carbon Sources ◽  
Hainan Province ◽  
Organic Carbon Sources

scholarly journals Use of Combined Microautoradiography and Fluorescence In Situ Hybridization To Determine Carbon Metabolism in Mixed Natural Communities of Uncultured Bacteria from the GenusAchromatium

2000 ◽  
Vol 66 (10) ◽  
pp. 4518-4522 ◽  
Author(s):  
N. D. Gray ◽  
R. Howarth ◽  
R. W. Pickup ◽  
J. Gwyn Jones ◽  
I. M. Head
Keyword(s):  
In Situ Hybridization ◽  
Organic Carbon ◽  
Fluorescence In Situ Hybridization ◽  
Carbon Metabolism ◽  
Carbon Sources ◽  
Uncultured Bacteria ◽  
Sulfur Bacteria ◽  
Organic Carbon Sources ◽  
Natural Communities

ABSTRACT Combined microautoradiography and fluorescence in situ hybridization (FISH) was used to investigate carbon metabolism in uncultured bacteria from the genus Achromatium. All of theAchromatium species identified in a freshwater sediment from Rydal Water, Cumbria, United Kingdom, which were distinguishable only by FISH, assimilated both [14C]bicarbonate and [14C]acetate. This extends previous findings thatAchromatium spp. present at another location could only utilize organic carbon sources. Achromatium spp., therefore, probably exhibit a range of physiologies, i.e., facultative chemolithoautotrophy, mixotrophy, and chemoorganoheterotrophy, similar to other large sulfur bacteria (e.g., Beggiatoa spp.).

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