ISSN:0264-3421    

DOI:10.1002/jctb.280340202

出版商:John Wiley&Sons, Ltd.    

年代:1984

数据来源: WILEY

摘要:

AbstractA continuous process control apparatus for the determination of ATP in biomass was developed for monitoring activated sludge quality in biological wastewater treatment plants. The determination of ATP was based on the firefly luciferase reaction. The extraction efficiency of ATP removal from the biomass, influence of extractant on bioluminescence and potential for automation were tested during optimisation procedures. During the operation of a laboratory scale bioreactor, the automatic ATP analysis system provided a rapid and reproducible monitor of the biomass. It was a sensitive detector of inhibitory effects in the bioreactor and proved an excellent ‘toxicity monitor

ISSN:0264-3421    

DOI:10.1002/jctb.280340203

出版商:John Wiley&Sons, Ltd.    

年代:1984

数据来源: WILEY

摘要:

AbstractThe mechanical foam‐breaking rotating disk (MFRD) was installed in a stirred draft‐tube bioreactor and provided effective foam‐breaking action. The device utilised the impact between atomised liquid particles projected from the disk and the ascending foam. The foam‐breaking characteristics of the MFRD were investigated in relation to the air sparge rate and the impeller speed. Empirical equations were devised to describe and predict the critical foam‐breaking regions of the MFRD under any operating conditions of the stirred draft‐tube

ISSN:0264-3421    

DOI:10.1002/jctb.280340204

出版商:John Wiley&Sons, Ltd.    

年代:1984

数据来源: WILEY

摘要:

AbstractThis paper describes an aspect of the growth dynamics exhibited by a ‘tight’ syntrophic association of two species in batch culture. SpeciesXutilises substrateSand forms a productP.The substancePboth inhibits the growth ofX, by virtue of the thermodynamic back reaction, and constitutes the growth‐limiting substrate of the organismY.It is predicted that the resulting dynamical balance in the level ofPresults in an equalisation of the specific growth rates of the two populations. It is demonstrated that the equalisation of specific growth rates is a characteristic property of tight syntrophic associations in general, and occurs whenever the growth dependencies on substancesSandPsatisfy certain qualitative condi

ISSN:0264-3421    

DOI:10.1002/jctb.280340205

出版商:John Wiley&Sons, Ltd.    

年代:1984

数据来源: WILEY

摘要:

AbstractSugar solutions obtained by dilute acid hydrolysis of the softwoodPinus radiatacontain various wood‐derived components which are inhibitory to the ethanolic fermentation by the yeastSaccharomyces cerevisiae.A detailed examination of these compounds indicated that a range of low molecular weight phenolics, related in structure to ‘Hibberts ketones’, may be identified as the most inhibitory materials. These lignin‐based compounds, although present at low levels compared with the carbohydrate‐degradation compounds, are approximately 10 times more i

ISSN:0264-3421    

DOI:10.1002/jctb.280340206

出版商:John Wiley&Sons, Ltd.    

年代:1984

数据来源: WILEY

摘要:

AbstractWith the present world problem of fossil fuel limitations, alcohol production from renewable resources such as sugar cane molasses, particularly by continuous processes, has become important. In continuous processing, feed contamination problems could become critical. A useful inexpensive technique, which can minimise these problems when molasses is used as the substrate, is to ensure that the time period elapsing after dilution of molasses and before feeding to the reactor is minimal. Experiments were conducted to determine how long the clarified molasses feed solution could be kept under non‐sterile conditions without affecting the performance of an immobilised whole cell reactor for alcohol production. For this purpose, the fastest growing contaminant (under the prevailing conditions) present in molasses feed solution was isolated by plating technique. From the initial total number of contaminant microorganisms in the feed solution, and from the experimentally determined generation time of the fastest growing contaminant cells, the safe period of storage of diluted molasses was calculated. This value was in reasonable agreement with the experimental observation

ISSN:0264-3421    

DOI:10.1002/jctb.280340207

出版商:John Wiley&Sons, Ltd.    

年代:1984

数据来源: WILEY

摘要:

AbstractIt has been suggested that cytoplasmic petite mutants ofSaccharomycesyeasts might be useful in commercial ethanol production since they are incapable of respiration. The authors have compared the rate and extent of ethanol production in a grande strain ofS. uvarumand in a cytoplasmic petite mutant derived from it. Increasing the concentration of O2in the input gas feed to a continuous culture of the grande beyond 0.17% increased the rate of biomass production at the expense of that of ethanol. In contrast, the rates of production of both biomass and ethanol by a similar culture of the petite increased with increasing O2up to a level of 0.6% of the input flow. Above that level no further increase was recorded. At no O2level did the yield or productivity of ethanol by the petite exceed the maximum obtainable with the grande. Batch culture studies demonstrated that the petite was more sensitive to the growth inhibitory effects of ethanol than was its grande parent. This may explain the poorer performance of the mutant strain.

ISSN:0264-3421    

DOI:10.1002/jctb.280340208

出版商:John Wiley&Sons, Ltd.    

年代:1984

数据来源: WILEY

摘要:

AbstractA rapid and reliable method ofKlaestimation under growth condition, based on the first moment analysis, is proposed. The method consists of a sudden change of agitation speed while the aeration rate is held constant: the first moment method of response curve analysis is used for estimatingKla.With the proposed method, it is not necessary to consider the gas kinetics because the composition of the gas phase remains constant.

ISSN:0264-3421    

DOI:10.1002/jctb.280340209

出版商:John Wiley&Sons, Ltd.    

年代:1984

数据来源: WILEY

ISSN:0264-3421    

DOI:10.1002/jctb.280340201

出版商:John Wiley&Sons, Ltd.    

年代:1984

数据来源: WILEY