摘要:

AbstractFungi and bacteria taken from fuel systems were allowed to grow in jet fuel (or hydrocarbon)–salt solution mixtures and the layers were analyzed for surfactant properties. The fuels included both JP‐4 and JP‐5 types and an alkylate bottom fraction. Controlled surface activity was imparted to some samples by adding minute quantities of either petroleum sulfonates or petroleum naphthenates. Analyses after growth periods of 2 to 14 weeks failed to show any significant increases in the surface active properties of any fuel or hydrocarbon sample. In all cases, there was either little change or else the surfactant effect was reduced slightly. Opposed to these findings, examination of the aqueous bottoms revealed that microbial growths did effect increases in their surface active prope

ISSN:0006-3592    

DOI:10.1002/bit.260040402

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

年代:1962

数据来源: WILEY

摘要:

AbstractIt would appear from these data that indeed asphalt degradation by bacteria does occur and can be rather rapid under laboratory conditions. The types of bacteria capable of degrading asphalt are diverse. The effects of temperature, pH, and oxygen tension on asphalt degradation are important but not always critical. The optimum conditions vary for different organisms. There are differences in the mechanisms of asphalt assimilation and degradation. There is a specificity of action by different bacteria which most likely involves the chemical components of the asphalts and the enzymatic action of the microorganism.

ISSN:0006-3592    

DOI:10.1002/bit.260040403

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

年代:1962

数据来源: WILEY

摘要:

AbstractAn analysis of the distribution of light within some culture vessels developed at General Dynamics/Electric Boat is presented. The concept of a mean effective light intensity,Ē, is introduced and procedures are developed for computingĒfor any culture vessel geometry and incident light intensity distribution. A correlation is performed indicating the significance ofĒin assessing the growth rate of dense, continuous cultures of microalag

ISSN:0006-3592    

DOI:10.1002/bit.260040404

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

年代:1962

数据来源: WILEY

ISSN:0006-3592    

DOI:10.1002/bit.260040405

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

年代:1962

数据来源: WILEY

摘要:

AbstractThe distribution of various cell constituents ofBacillus megateriumhas been studied in an aqueous two‐phase system containing the two polymers dextran and polythylene glycol. The difference in behaviour between cell walls, lipid granules and soluble cell material are such that a considerable fractionation of a suspension of disrupted cells may be obtained after a few counter‐current distributions. A mixture of whole cells and protoplasts can also be fractionated in this phase system. If sodium chloride is added to the phase system, vegetative cells and spores can be separated from each ot

ISSN:0006-3592    

DOI:10.1002/bit.260040406

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

年代:1962

数据来源: WILEY

ISSN:0006-3592    

DOI:10.1002/bit.260040407

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

年代:1962

数据来源: WILEY

ISSN:0006-3592    

DOI:10.1002/bit.260040401

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

年代:1962

数据来源: WILEY