Growth kinetics of Thermus thermophilus

Sonnleitner, Bernhard; Cometta, S.; Fiechter, Armin

doi:10.1007/bf00499510

Cited by 33 publications

(11 citation statements)

References 18 publications

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“…Literature data concerning pure cultures of microorganisms mostly report higher decay rates under thermophilic conditions [11,18,28] although some do not [3,6]. Based on the current results and literature data, we believe that bacterial decay is higher under thermophilic conditions compared to mesophilic conditions, but to what extent remains subject to speculation.…”

Section: Decay Ratesmentioning

confidence: 45%

“…Reported l max values for thermophilic wastewater treatment processes vary between 0.1 and 0.5 h )1 [7,8,12,16,20,21,31]. For pure cultures of microorganisms l max values of 1.0 h )1 have been reported [4] but extremely high growth rates of 3.5 h )1 could be obtained only under typical conditions with incomplete substrate utilization [11,28] or by growth on a complex medium [18]. The intrinsic l max values obtained in this study correspond well with the reported literature data and, given the reproducibility of the results, can be regarded as accurate estimates of the intrinsic l max for the specified substrate and temperatures.…”

Section: Maximum Growth Ratesmentioning

confidence: 97%

“…Generally, Monod constants are extremely low [27, p 10] and this study shows that this is also the case for thermophilic microorganisms. One exception is that microorganisms can lose their substrate affinity in order to obtain extremely high growth rates of 3.5 h )1 [7,8,28] but this phenomenon does not seem to be common [28].…”

Section: Effluent Soluble Cod and Monod Constantmentioning

confidence: 99%

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Kinetic comparisons of mesophilic and thermophilic aerobic biomass

Vogelaar¹,

Klapwijk

Temmink

et al. 2003

J IND MICROBIOL BIOTECHNOL

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Kinetic parameters describing growth and decay of mesophilic (30 degrees C) and thermophilic (55 degrees C) aerobic biomass were determined in continuous and batch experiments by using oxygen uptake rate measurements. Biomass was cultivated on a single soluble substrate (acetate) in a mineral medium. The intrinsic maximum growth rate ( micro (max)) at 55 degrees C was 0.71+/-0.09 h(-1), which is 1.5 times higher than the micro (max) at 30 degrees C (0.48+/-0.11 h(-1)). The biomass decay rates increased from 0.004 h(-1) at 30 degrees C to 0.017 h(-1) at 55 degrees C. Monod constants were very low for both types of biomass: 9+/-2 mg chemical oxygen demand (COD) l(-1)at 30 degrees C and 3+/-2 mg COD l(-1)at 55 degrees C. Theoretical biomass yields were similar at 30 and 55 degrees C: 0.5 g biomass COD (g acetate COD)(-1). The observed biomass yields decreased under both temperature conditions as a function of the cell residence time. Under thermophilic conditions, this effect was more pronounced due to the higher decay rates, resulting in lower biomass production at 55 degrees C compared to 30 degrees C.

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Section: Decay Ratesmentioning

confidence: 45%

Section: Maximum Growth Ratesmentioning

confidence: 97%

Section: Effluent Soluble Cod and Monod Constantmentioning

confidence: 99%

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Kinetic comparisons of mesophilic and thermophilic aerobic biomass

Vogelaar¹,

Klapwijk

Temmink

et al. 2003

J IND MICROBIOL BIOTECHNOL

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“…This study also indicated that nutrients were not totally depleted at the end of the cultures. In fact, some studies report quite low consumptions of nutrients by Thermus strains [23,24]. In the literature, the peptone and yeast extract concentrations employed are usually the same as the basal medium used in this work [25][26][27][28].…”

Section: Influence Of Nutrient Concentration On T Thermophilus Hb27 mentioning

confidence: 98%

Assessment of Relevant Factors Influencing Lipolytic Enzyme Production by Thermus thermophilus HB27 in Laboratory‐Scale Bioreactors

et al. 2009

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Nowadays, there is not much information on the large-scale production of thermostable lipolytic enzymes by thermophilic organisms. Therefore, in this study the lipolytic enzyme production by Thermus thermophilus HB27 in laboratoryscale bioreactors was undertaken. In order to determine the most suitable bioreactor, two configurations were investigated: stirred-tank and airlift bioreactor. It was demonstrated that the stirred-tank configuration led to the highest lipolytic extracellular activities, about 2.3-fold higher than those found in the corresponding cultivation in the airlift bioreactor. On the other hand, the influence of several factors such as culture nutrients concentration, aeration, and agitation rate on the production of thermophilic lipolytic enzymes in a 5-L stirred-tank bioreactor was assayed. At reduced nutrients concentration (50 % with respect to the basal medium), a higher product/biomass yield was attained, without any operational problems. From the relationship between mass transfer coefficient (K L a), aeration, and agitation rates it was concluded that there is a lesser dependence on the aeration than the agitation rate. In addition, the mechanical stirring of the bioreactor could tear the membranes that contain the rotund bodies often found in cultures of thermophilic microorganisms, thus increasing the extracellular enzyme production.

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“…However, publications on the growth profile of ethanologenic thermophiles are scarce and genetic manipulation on this organism is limited. Reports were mainly emphasized on isolation, biomass production, and thermostable enzyme production (Degryse et al 1978;Sonnleitner et al 1982;Hyun et al 1983;Wiegel et al 1985;Shcherbakova and Serdyuk 2000;Dermitas et al 2003;Chinn et al 2006).…”

Section: Kinetic Evaluation Of Ethanol-tolerant Thermophile Geobacillmentioning

confidence: 99%

KINETIC EVALUATION OF ETHANOL-TOLERANT THERMOPHILE Geobacillus thermoglucosidasius M10EXG FOR ETHANOL PRODUCTION

Riyanti¹,

Rogers²

2016

Indones. J. Agric. Sci.

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Thermophiles are challenging to be studied for ethanol production using agricultural waste containing lignocellulosic materials rich in hexose and pentose. These bacteria have many advantages such as utilizing a wide range of substrates, including pentose (C5) and hexose (C6). In ethanol production, it is important to use ethanol tolerant strain capable in converting lignocellulosic hydrolysate. This study was aimed to investigate the growth profile of ethanol-tolerant thermophile Geobacillus thermoglucosidasius M10EXG using a defined growth medium consisted of single carbon glucose (TGTV), xylose (TXTV), and a mixture of glucose and xylose (TGXTV), together with the effect of yeast extract addition to the media. The experiments were conducted at

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Growth kinetics of Thermus thermophilus

Cited by 33 publications

References 18 publications

Kinetic comparisons of mesophilic and thermophilic aerobic biomass

Kinetic comparisons of mesophilic and thermophilic aerobic biomass

Assessment of Relevant Factors Influencing Lipolytic Enzyme Production by Thermus thermophilus HB27 in Laboratory‐Scale Bioreactors

KINETIC EVALUATION OF ETHANOL-TOLERANT THERMOPHILE Geobacillus thermoglucosidasius M10EXG FOR ETHANOL PRODUCTION

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