Etude de la respiration de la levure au cours de la sporulation

1971 ◽  
Vol 17 (9) ◽  
pp. 1179-1184 ◽  
Author(s):  
Françoise Vezinhet ◽  
A. Arnaud ◽  
P. Galzy
Keyword(s):  
Acetic Acid ◽  
Carbon Source ◽  
Oxidation Rate ◽  
Sporulation Medium ◽  
Exogenous Carbon Source

During the process of sporulation, the oxidation rate of exogenous carbon source, acetic acid, is high during a period lasting from 1 to 4 h. Then it falls rapidly and the metabolism of acetic acid seems to be deflected. Endogenous oxidation rate rises rapidly at the beginning of the process and reaches its maximum after a 12- to 16-h contact with the sporulation medium. Then it falls regularly.

Biophotolysis-based hydrogen and lipid production by oleaginous microalgae using crude glycerol as exogenous carbon source

2017 ◽  
Vol 42 (4) ◽  
pp. 1970-1976 ◽  
Author(s):  
Dennapa Sengmee ◽  
Benjamas Cheirsilp ◽  
Thanwadee Tachapattaweawrakul Suksaroge ◽  
Poonsuk Prasertsan
Keyword(s):  
Carbon Source ◽  
Crude Glycerol ◽  
Lipid Production ◽  
Oleaginous Microalgae ◽  
Exogenous Carbon Source

Bacterial Cellulose Production Using Monosaccharides Derived from Hemicelluloses in Water-Soluble Fraction of Waste Liquor from Atmospheric Acetic Acid Pulping

Holzforschung ◽  
2002 ◽  
Vol 56 (4) ◽  
pp. 341-347 ◽  
Author(s):  
Y. Uraki ◽  
M. Morito ◽  
T. Kishimoto ◽  
Y. Sano
Keyword(s):  
Acetic Acid ◽  
Carbon Source ◽  
Bacterial Cellulose ◽  
Catalytic Reduction ◽  
Soluble Fraction ◽  
Glucose Isomerase ◽  
Water Soluble ◽  
Cellulose Production ◽  
Water Soluble Fraction ◽  
Waste Liquor

Summary The water-soluble fraction (WS) from waste liquor of atmospheric acetic acid pulping was analyzed in order to explore its potential utilization as a carbon source for bacterial cellulose (BC) production. The unpurified WS that contained colored compounds had appreciable antibacterial activity and was therefore not used as a carbon source for BC production with the bacteria Acetobacter xylinum ATCC 10245 and 53582. However, the bacteria produced BC from purified WS of both fir and birch after activated carbon treatment. The yields of BC were much lower compared to those using glucose as a typical carbon source in the Hestrin-Schramm (HS) medium. In order to improve the cellulose production, monosaccharides derived from hemicellulose sugars in WS were modified. The WS from softwood was reduced by catalytic reduction, i.e. mannose, the major component of softwood monosaccharides derived from hemicelluloses, was converted to mannitol. In the case of hardwood WS, xylose was isomerized with glucose isomerase to xylulose. The yield of BC was considerably enhanced by both modifications of the WS. The yield of BC using the modified WS from the pulping of fir was superior to that using glucose as carbon source.

scholarly journals Microbial production of mevalonate by recombinant Escherichia coli using acetic acid as a carbon source

Bioengineered ◽  
2017 ◽  
Vol 9 (1) ◽  
pp. 116-123 ◽  
Author(s):  
Xin Xu ◽  
Meng Xie ◽  
Qian Zhao ◽  
Mo Xian ◽  
Huizhou Liu
Keyword(s):  
Escherichia Coli ◽  
Acetic Acid ◽  
Carbon Source ◽  
Microbial Production ◽  
Recombinant Escherichia Coli

scholarly journals Surveying Denitrification Efficacy in Up-Flow Packed Bed Bioreactor Operated under Heterotrophic Condition Using Autotrophic Bacteria

2019 ◽  
Author(s):  
Ali Asghar Neshat ◽  
Abdomajid Gholizadeh ◽  
Babak Jahed ◽  
Pouria Nikvand
Keyword(s):  
Acetic Acid ◽  
Carbon Source ◽  
High Efficiency ◽  
Nitrate Removal ◽  
Packed Bed ◽  
Critical Issue ◽  
Pilot Scale ◽  
Aqueous Environment ◽  
Packed Bed Bioreactor ◽  
Autotrophic Bacteria

Introduction: The biological denitrification process is an interesting cost-effective technique to remove nitrate from water supplies. Acetic acid can be used as a carbon source in this process, but its consumption rate is a critical issue and, in some cases, it is quite different from stoichiometric constants. The current study aimed to investigate the nitrate removal in an up-flow packed bed bioreactor. Furthermore, various parameters affecting this process were investigated and optimized. In this study, the autotrophic bacteria were used for the heterotrophic process. Materials and Methods: Initially, the autotrophic bacteria were cultured and used for the following heterotrophic conditions in distinct reactors. A pilot-scale anoxic up flow bioreactor packed was constructed using the polyethylene media and applied to remove nitrate from the aqueous environment. Consequently, the effects of hydraulic retention times (HRT) and different acetic acid concentrations as carbon source were evaluated. During the study, the amounts of alkalinity, pH, temperature, and nitrate were checked. Results: The designed bioreactor removed an average of over 88% of nitrate, while the acetic acid consumption was 2 mg/mg NO3-N, which was lower than the stoichiometric constant for heterotrophic process. Moreover, in the three studied HRTs (1.5, 3, and 5 h), the Alkalinity increased from 14.2 to 19.8 %. Conclusion: The results of this study showed high efficiency in nitrate removal via heterotrophic denitrification using acetic acid as carbon source for autotrophic bacteria.

scholarly journals PRODUCTION OF CANDIDA UTILIS WITH 93 AT. PERCENT $sup 13$C ACETIC ACID AS THE SOLE CARBON SOURCE.

1970 ◽  
Author(s):  
V Kollman ◽  
W Adams ◽  
J Buchholz ◽  
C Christenson ◽  
J Langham ◽  
...  
Keyword(s):  
Acetic Acid ◽  
Carbon Source ◽  
Sole Carbon Source ◽  
Candida Utilis

Metabolomic insights into polyhydroxyalkanoates production by halophilic bacteria with acetic acid as carbon source

2019 ◽  
Vol 83 (10) ◽  
pp. 1955-1963 ◽  
Author(s):  
Pan Wang ◽  
Yin-Quan Qiu ◽  
Xi-Teng Chen ◽  
Xiao-Fei Liang ◽  
Lian-Hai Ren
Keyword(s):  
Acetic Acid ◽  
Carbon Source ◽  
Halophilic Bacteria

Groundwater denitrification with alternative carbon sources

1998 ◽  
Vol 38 (6) ◽  
pp. 237-243 ◽  
Author(s):  
A. Mohseni-Bandpi ◽  
D. J. Elliott
Keyword(s):  
Acetic Acid ◽  
Carbon Source ◽  
Nitrate Nitrogen ◽  
Nitrogen Concentration ◽  
Nitrate Removal ◽  
Carbon Sources ◽  
Pilot Scale ◽  
Rotating Biological Contactor ◽  
Nitrogen Ratio ◽  
Biological Nitrate Removal

A pilot scale rotating biological contactor (RBC) was used to investigate the removal of nitrate-nitrogen from groundwater using three different carbon sources, i.e., methanol, ethanol and acetic acid. Optimum carbon sources to influent nitrate-nitrogen ratio were established by varying the influent concentration of carbon sources. The optimum ratio of methanol, ethanol and acetic acid to nitrate-nitrogen ratios were found to be 2.9, 2.35 and 4.3 respectively. The nitrate-nitrogen removal efficiency averaged 93, 91 and 98 for methanol, ethanol and acetic acid respectively at a loading rate of 76 mg/m2.h. The results of this study show that the acetic acid is the most efficient carbon source for removal of nitrate-nitrogen. Effluent nitrite-nitrogen concentration was minimum for acetic acid as compared with ethanol and methanol. The effluent contained minimum suspended solids and turbidity for methanol as a carbon source. The results of this study indicate that biological nitrate removal using a RBC is a reliable and stable system under all the three carbon sources. The denitrified water in all cases requires some post treatment to oxidise the residual carbon source and remove biomass before distribution.

scholarly journals Acetate as substrate for l-malic acid production with Aspergillus oryzae DSM 1863

2021 ◽  
Vol 14 (1) ◽  
Author(s):  
Aline Kövilein ◽  
Julia Umpfenbach ◽  
Katrin Ochsenreither
Keyword(s):  
Acetic Acid ◽  
Carbon Source ◽  
Aspergillus Oryzae ◽  
Malic Acid ◽  
Acid Production ◽  
Morphological Changes ◽  
Production Costs ◽  
High Tolerance ◽  
Acid Yield ◽  
Acetate Concentration

Abstract Background Microbial malic acid production is currently not able to compete economically with well-established chemical processes using fossil resources. The utilization of inexpensive biomass-based substrates containing acetate could decrease production costs and promote the development of microbial processes. Acetate is a by-product in lignocellulosic hydrolysates and fast pyrolysis products or can be synthesized by acetogens during syngas fermentation. For the fermentation of these substrates, a robust microorganism with a high tolerance for biomass-derived inhibitors is required. Aspergillus oryzae is a suitable candidate due to its high tolerance and broad substrate spectrum. To pave the path towards microbial malic acid production, the potential of acetate as a carbon source for A. oryzae is evaluated in this study. Results A broad acetate concentration range was tested both for growth and malic acid production with A. oryzae. Dry biomass concentration was highest for acetic acid concentrations of 40–55 g/L reaching values of about 1.1 g/L within 48 h. Morphological changes were observed depending on the acetate concentration, yielding a pellet-like morphology with low and a filamentous structure with high substrate concentrations. For malic acid production, 45 g/L acetic acid was ideal, resulting in a product concentration of 8.44 ± 0.42 g/L after 192 h. The addition of 5–15 g/L glucose to acetate medium proved beneficial by lowering the time point of maximum productivity and increasing malic acid yield. The side product spectrum of cultures with acetate, glucose, and cultures containing both substrates was compared, showing differences especially in the amount of oxalic, succinic, and citric acid produced. Furthermore, the presence of CaCO3, a pH regulator used for malate production with glucose, was found to be crucial also for malic acid production with acetate. Conclusions This study evaluates relevant aspects of malic acid production with A. oryzae using acetate as carbon source and demonstrates that it is a suitable substrate for biomass formation and acid synthesis. The insights provided here will be useful to further microbial malic acid production using renewable substrates.

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