摘要:

AbstractAn experimental investigation of the foam separation ofE. colifrom distilled water suspension using a cationic surface‐active agent, ethylhexadecyldimethyl‐ammonium bromide (EHDA‐Br) is presented. Results are evaluated in terms of total cell count, using a membrane filtration technique. Cell concentrations in the initial suspensions are varied from 5.0 × 105to 1.0 × 108cells/ml. Surfactant concentrations in the initial cell suspensions are varied from 0.015 to 0.040 mg./ml., and foaming times are varied from 2 to 20 min. The residual quantity of cells decreases exponentially with foaming time to about 0.02% of the initial quantity after 20 min. The cell enrichment ratio, varying from 10 to 1,000,000, is an inverse power function of the initial surfactant concentration and an exponential function of foaming time. Foaminess decreases with increasing initial cell concentrations, and for an initial surfactant concentration of 0.030 mg./ml., the residual cell concentration is a linear function of the initial cell concen

ISSN:0006-3592    

DOI:10.1002/bit.260080302

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1966

数据来源: WILEY

摘要:

AbstractOxygen uptake ofPenicillium chrysogenumhyphae growing in automatically aerated deep cultures was the subject of local and periodical change. The change depended on the concentration of carbon dioxide which accumulated in the gas phase of system during the evolution of foam bubbles, and which was suddenly liberated when the foam was destroyed. The actual concentration of sunflower oil added as an antifoaming agent also influenced the oxygen uptake of culture.

ISSN:0006-3592    

DOI:10.1002/bit.260080303

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1966

数据来源: WILEY

ISSN:0006-3592    

DOI:10.1002/bit.260080304

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1966

数据来源: WILEY

摘要:

AbstractPrevious studies indicated that when cells grown in a NaCl‐free glucose medium were subjected to a high salt concentration, cellular constituents were released which were metabolized by the cells in preference to glucose. In the present study, cells grown on glucose in high salt medium were subjected to a shock loading of salt‐free medium. In this case, the resulting lysate was not used in preference to glucose; the lysate was metabolized only after an acclimation period following glucose utilization. It was shown by injecting chloramphenicol into the reaction liquor during glucose metabolism that new protein synthesis was required in order to metabolize the lysate. This response represents an additional way in which a rapid change in salt concentration can adversely affect biological treatment of waste waters, and a new type of situation in which sequential removal of substrates occ

ISSN:0006-3592    

DOI:10.1002/bit.260080305

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1966

数据来源: WILEY

摘要:

AbstractA multiphase project has been planned to develop a new biological process capable of economically treating high BOD wastes. Herein is presented the results of the first phase of the program, in which the feasibility of growing concentrated microbial cultures was investigated and the oxygen and power requirements for maintaining such cultures were determined. An example is given of the scale‐up of power requirements for oxygen transfer in a prototype syste

ISSN:0006-3592    

DOI:10.1002/bit.260080306

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1966

数据来源: WILEY

ISSN:0006-3592    

DOI:10.1002/bit.260080307

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1966

数据来源: WILEY

ISSN:0006-3592    

DOI:10.1002/bit.260080308

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1966

数据来源: WILEY

摘要:

AbstractPresented is a mathematical model for the continuous‐flow steady‐state bacterial culture which permits the experimental determination of carbon transfer rates within the system by use of radioactive tracer techniques. The transfer rates are specific for hydraulic loading rates, feed concentrations, type of organism, and substrate, and were incorporated within the existing theoretical description of the growth kinetics in order to elucidate the yield relationships. The carbon transfer rate of cells to soluble organic substrate was observed to exhibit a minimum value at or near dilution rateD= 0.5 hr.−1. A maximum effective yield coefficient,Y, was observed at the same value ofD. At dilution rates greater and less thanD= 0.5 hr.−1, the cell–substrate transfer rate increased, and effective yield coefficient was observed to decrease. The former showed increases of 50–200%, and the latter exhibited decreases of the order of 10%. The magnitude of these variations would seem to be significant in industrial fermentation processes which utilize continuous microbiological cultures. In light of these findings, the results of other researchers were shown to exhibit maximum effective yield at similar dilution rates or proce

ISSN:0006-3592    

DOI:10.1002/bit.260080309

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1966

数据来源: WILEY

ISSN:0006-3592    

DOI:10.1002/bit.260080310

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1966

数据来源: WILEY

ISSN:0006-3592    

DOI:10.1002/bit.260080311

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1966

数据来源: WILEY