scholarly journals Utilization of Organic Acids and Volatile Fatty Acids, and Hydrogen Production by Photosynthetic Bacteria.

1996 ◽  
Vol 19 (1) ◽  
pp. 63-70 ◽  
Author(s):  
Ken SASAKI ◽  
Kenji TAKENO ◽  
Yoshiaki EMOTO
Keyword(s):  
Fatty Acids ◽  
Hydrogen Production ◽  
Organic Acids ◽  
Volatile Fatty Acids ◽  
Photosynthetic Bacteria

scholarly journals Hydrogen Production with Volatile Fatty Acids by Enrichment Culture of Halotolerant Photosynthetic Bacteria from Tideland Sediment

2006 ◽  
Vol 42 (1) ◽  
pp. 9-16
Author(s):  
YASUNORI KAWAGOSHI ◽  
HIROKAZU TAKAHASHI ◽  
YUKO OKAZAKI ◽  
HITOSHI HASEGAWA ◽  
KENJI FURUKAWA
Keyword(s):  
Fatty Acids ◽  
Hydrogen Production ◽  
Volatile Fatty Acids ◽  
Photosynthetic Bacteria ◽  
Enrichment Culture

Organic Acids and Anaerobic Microorganisms in the Contents of the Cholesteatoma SAC

1983 ◽  
Vol 92 (1) ◽  
pp. 91-96 ◽  
Author(s):  
Yukiko Iino ◽  
Tomonori Takasaka ◽  
Etsuro Hoshino ◽  
Yutaka Kaneko ◽  
Sachiko Tomioka ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Organic Acids ◽  
Volatile Fatty Acids ◽  
Chromatographic Technique ◽  
Anaerobic Conditions ◽  
Clostridium Species ◽  
Anaerobic Microorganisms ◽  
Aerobic And Anaerobic ◽  
Aerobic And Anaerobic Conditions

Organic acids in the contents of the cholesteatoma sac from 28 cases were studied by gas chromatographic technique. Five volatile fatty acids (acetate, propionate, isobutyrate, butyrate and isovalerate) and lactate were detected in large amounts, which may lower the pH of the cholesteatoma content. These acids were considered to be derived from products of anaerobic microorganisms. Therefore, the contents from 12 cases were cultured anaerobically in a glove box. Obligate microorganisms were identified in 92% of the cases and Peptococcus, Bacteroides, and Clostridium species were frequently isolated. In vitro, such obligate anaerobes produced various organic acids from the cholesteatoma content. Facultatives such as Staphylococcus aureus and Proteus mirabilis produced acetate in the content under aerobic and anaerobic conditions, whereas no organic acid was produced by Pseudomonas aeruginosa. Organic acids in the cholesteatoma content could be fermentative products made by the microorganisms, anaerobes and facultatives, which use the content as a substrate for acid production.

Improved biomass production by humic analog anthraquinone-2-sulfonate from kitchen waste in a two-phase system

RSC Advances ◽  
2016 ◽  
Vol 6 (12) ◽  
pp. 9554-9562 ◽  
Author(s):  
Xingzu Wang ◽  
Guihua Xu ◽  
Chunli Wan ◽  
Yiwei Ren ◽  
Enling Tian
Keyword(s):  
Fatty Acids ◽  
Biomass Production ◽  
Volatile Fatty Acids ◽  
Photosynthetic Bacteria ◽  
Biomass Yield ◽  
Phase System ◽  
Kitchen Waste ◽  
Two Phase ◽  
System P ◽  
Anoxygenic Photosynthetic Bacteria

The volatile fatty acids from kitchen waste were used as substrates of anoxygenic photosynthetic bacteria (APB) in a dark-photo fermentation reactor, and anthraquinone-2-sulfonate (AQS) was firstly applied to boost the biomass yield.

Fermentation of Chlorella sp. for anaerobic bio-hydrogen production: Influences of inoculum–substrate ratio, volatile fatty acids and NADH

2011 ◽  
Vol 102 (22) ◽  
pp. 10480-10485 ◽  
Author(s):  
Jingxian Sun ◽  
Xianzheng Yuan ◽  
Xiaoshuang Shi ◽  
Chunfeng Chu ◽  
Rongbo Guo ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Hydrogen Production ◽  
Volatile Fatty Acids ◽  
Chlorella Sp ◽  
Substrate Ratio

THE PRODUCTION OF ORGANIC ACIDS IN THE PIG: I. THE EFFECT OF DIET ON THE PROPORTIONS OF VOLATILE FATTY ACIDS IN PIG FECES

1962 ◽  
Vol 42 (1) ◽  
pp. 55-62 ◽  
Author(s):  
D. W. Friend ◽  
J. W. G. Nicholson ◽  
H. M. Cunningham
Keyword(s):  
Fatty Acids ◽  
Acetic Acid ◽  
Organic Acids ◽  
Volatile Fatty Acids ◽  
Statistical Significance ◽  
Valeric Acid ◽  
Crude Fiber ◽  
The Difference ◽  
Diet Level

Experiments were conducted to determine the effect of diet, level of feeding and age and/or weight on the proportions of volatile fatty acids (VFA) in the feces of pigs. Cellulose was added to the control ration fed in one experiment and dried whey or bran to that fed in another experiment. When the level of intake of the cellulose-supplemented ration was reduced, the digestibility of crude fiber in the ration increased. The proportion of fecal acetic acid also increased, but the difference observed did not reach statistical significance at P = 0.05. Differences in the proportion of acetic, butyric and valeric acid due to cellulose supplementation of the control ration were statistically significant (P < 0.05). The whey and the bran-supplemented rations gave statistically significant differences (P < 0.05 or P < 0.01) for the proportions of fecal valeric, propionic or acetic acid. The proportions of fecal VFA appeared to be relatively unaffected by the age and/or weight of pigs from weaning to market weight.

scholarly journals Optimizing the impact of temperature on bio-hydrogen production from food waste and its derivatives under no pH control using statistical modelling

2015 ◽  
Vol 12 (21) ◽  
pp. 6503-6514 ◽  
Author(s):  
C. Arslan ◽  
A. Sattar ◽  
C. Ji ◽  
S. Sattar ◽  
K. Yousaf ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Hydrogen Production ◽  
Food Waste ◽  
Volatile Fatty Acids ◽  
Negative Impact ◽  
Glucose Consumption ◽  
Statistical Modelling ◽  
Effect Of Temperature ◽  
Coefficient Of Determination ◽  
The Impact

Abstract. The effect of temperature on bio-hydrogen production by co-digestion of sewerage sludge with food waste and its two derivatives, i.e. noodle waste and rice waste, was investigated by statistical modelling. Experimental results showed that increasing temperature from mesophilic (37 °C) to thermophilic (55 °C) was an effective mean for increasing bio-hydrogen production from food waste and noodle waste, but it caused a negative impact on bio-hydrogen production from rice waste. The maximum cumulative bio-hydrogen production of 650 mL was obtained from noodle waste under thermophilic temperature condition. Most of the production was observed during the first 48 h of incubation, which continued until 72 h of incubation. The decline in pH during this interval was 4.3 and 4.4 from a starting value of 7 under mesophilic and thermophilic conditions, respectively. Most of the glucose consumption was also observed during 72 h of incubation and the maximum consumption was observed during the first 24 h, which was the same duration where the maximum pH drop occurred. The maximum hydrogen yields of 82.47 mL VS−1, 131.38 mL COD−1, and 44.90 mL glucose−1 were obtained from thermophilic food waste, thermophilic noodle waste and mesophilic rice waste, respectively. The production of volatile fatty acids increased with an increase in time and temperature in food waste and noodle waste reactors whereas they decreased with temperature in rice waste reactors. The statistical modelling returned good results with high values of coefficient of determination (R2) for each waste type and 3-D response surface plots developed by using models developed. These plots developed a better understanding regarding the impact of temperature and incubation time on bio-hydrogen production trend, glucose consumption during incubation and volatile fatty acids production.

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