Document Detail

Survival of airborne bacteria in a high urban concentration of carbon monoxide.
MedLine Citation:
PMID:  4631439     Owner:  NLM     Status:  MEDLINE    
Vegetative cells of Serratia marcescens 8UK, Sarcina lutea, and spores of Bacillus subtilus var. niger were held in aerosols, with and without an urban concentration of CO (85 muliters per liter or ppm), for up to 6 hr at 15 C and a relative humidity (RH) of approximately 0, 25, 50, 75, and 95%. It was found that CO enhanced the death rate of S. marcescens 8UK at least four- to sevenfold at low RH (ca. 1 to 25%), but protected the cells at high RH (ca. 90%). Death rates of S. lutea, with or without added CO, were comparatively low over the entire RH range. However, in the first hour, airborne S. lutea held in CO-containing air were more stable than those in air without added CO (i.e., CO protection). A marked increase in the death rate (up to 70-fold) occurred in the subsequent 5 hr within the RH range of approximately 0 to 75%. Statistical analysis indicated that aerosol decay rates of B. subtilus var. niger spores decreased significantly, when held in a CO-containing as compared to a non-CO-containing atmosphere, in the 0 to 85% RH range. Thus, the data presented indicate that CO in the urban environment may have a protective or lethal effect on airborne bacteria, dependent upon at least the microbial species, aerosol age, and relative humidity. A mechanism for CO death enhancement and protection of airborne S. marcescens 8UK is suggested to involve CO uncoupling of an energy-requiring death mechanism and an energy-requiring maintenance mechanism at high and low RH, respectively.
B Lighthart
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Applied microbiology     Volume:  25     ISSN:  0003-6919     ISO Abbreviation:  Appl Microbiol     Publication Date:  1973 Jan 
Date Detail:
Created Date:  1973-04-06     Completed Date:  1973-04-06     Revised Date:  2013-06-12    
Medline Journal Info:
Nlm Unique ID:  7605802     Medline TA:  Appl Microbiol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  86-91     Citation Subset:  IM    
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MeSH Terms
Air Microbiology*
Bacillus subtilis* / drug effects
Bacteriological Techniques
Carbon Monoxide / pharmacology*
Cell Survival / drug effects
Environmental Exposure
Micropore Filters
Sarcina* / drug effects
Serratia marcescens* / drug effects
Species Specificity
Spores, Bacterial / drug effects
Time Factors
Reg. No./Substance:
0/Aerosols; 630-08-0/Carbon Monoxide

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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