EVALUATION OF FLOAT TRAYS WITH HIGH CELL NUMBERS ON STAND COUNTS AND YIELDS IN A CLOSE-GROWN TOBACCO PRODUCTION SYSTEM

2012 ◽  
Vol 49 ◽  
pp. 4-7 ◽  
Author(s):  
Richard Mundell ◽  
Orlando Chambers ◽  
James P O'Daniel ◽  
H. Maelor Davies
Keyword(s):  
Production System ◽  
High Cell ◽  
Cell Numbers ◽  
Tobacco Production

scholarly journals Cooccurrence of Aerobic and Anaerobic Methane Oxidation in the Water Column of Lake Plußsee

2005 ◽  
Vol 71 (12) ◽  
pp. 8925-8928 ◽  
Author(s):  
Gundula Eller ◽  
Layla Känel ◽  
Martin Krüger
Keyword(s):  
Water Column ◽  
Methane Oxidation ◽  
Eutrophic Lake ◽  
Anaerobic Methane Oxidation ◽  
Sulfide Concentration ◽  
High Cell ◽  
Cell Numbers ◽  
Aerobic And Anaerobic ◽  
Hydrogen Sulfide Concentration

ABSTRACT Dissolved methane was investigated in the water column of eutrophic Lake Plußsee and compared to temperature, oxygen, and sulfide profiles. Methane concentrations and δ-13C signatures indicated a zone of aerobic methane oxidation and additionally a zone of anaerobic methane oxidation in the anoxic water body. The latter coincided with a peak in hydrogen sulfide concentration. High cell numbers of aerobic and anaerobic methane-oxidizing microorganisms were detected by fluorescence in situ hybridization (FISH) or the more sensitive catalyst-amplified reporter deposition-FISH, respectively, in these layers.

Degradation of benzo[a]pyrene, dibenz[a,h]anthracene and coronene by burkholderia cepacia

1997 ◽  
Vol 36 (10) ◽  
pp. 45-51 ◽  
Author(s):  
Albert L. Juhasz ◽  
Margaret L. Britz ◽  
Grant A. Stanley
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Burkholderia Cepacia ◽  
High Cell Density ◽  
Complex Mixture ◽  
Sole Source ◽  
High Cell ◽  
Cell Numbers ◽  
Plant Soil ◽  
High Molecular Weight Pahs

A Burkholderia cepacia strain (VUN 10,001) isolated from manufacturing gas plant soil was selected for its ability to grow on and degrade pyrene as a sole source of carbon and energy. VUN 10,001 was able to grow on fluorene, phenanthrene benz[a]anthracene, fluoranthene and pyrene, but not benzo[a]pyrene and dibenz[a,h]anthracene when tested using inocula with low cell numbers. However, a small decrease in the concentrations of these latter compounds was observed. When media were inoculated at a high cell density, VUN 10,001 degraded the high molecular weight PAHs benzo[a]pyrene, dibenz[a,h]anthracene and coronene when these were present as individual substrates or as components of a complex mixture. Degradation of the high molecular weight PAHs was found to increase in the presence of the lower molecular weight compounds.

Enterococcus mundtii ST4SA and Lactobacillus plantarum 423 excludes Listeria monocytogenes from the GIT, as shown by bioluminescent studies in mice

2016 ◽  
Vol 7 (2) ◽  
pp. 227-235 ◽  
Author(s):  
W.F. van Zyl ◽  
S.M. Deane ◽  
L.M.T. Dicks
Keyword(s):  
Listeria Monocytogenes ◽  
Lactobacillus Plantarum ◽  
Intestinal Tract ◽  
Competitive Exclusion ◽  
High Cell ◽  
Cell Numbers ◽  
Food Borne ◽  
Enterococcus Mundtii ◽  
Life Threatening ◽  
Gastro Intestinal Tract

Listeria monocytogenes is an opportunistic food-borne pathogen and is life-threatening to individuals with a weakened immune system. The aim of this study was to determine if Lactobacillus plantarum 423 and Enterococcus mundtii ST4SA could prevent colonisation of L. monocytogenes in the gastro-intestinal tract (GIT). Mice were gavaged with L. plantarum 423, E. mundtii ST4SA, and a combination of the two strains, for 6 consecutive days and orally infected with a bioluminescent strain of L. monocytogenes (strain EGDe) on the last day of treatment. 30 min after infection, high cell numbers of L. plantarum 423, E. mundtii ST4SA and L. monocytogenes EGDe were isolated from faeces. L. monocytogenes EGDe cells were absent from the small intestine of L. plantarum 423-treated mice 4 h after infection and from the large intestine 2 h later. No bioluminescent, and thus metabolically active, cells of L. monocytogenes EGDe were recorded in the GIT of mice treated with E. mundtii ST4SA, suggesting that their growth was repressed. L. plantarum 423 and E. mundtii ST4SA colonised the colon the strongest. These strains may be considered for the competitive exclusion of L. monocytogenes from the GIT.

scholarly journals Porphyromonas gingivalis: Major Periodontopathic Pathogen Overview

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Jaroslav Mysak ◽  
Stepan Podzimek ◽  
Pavla Sommerova ◽  
Yelena Lyuya-Mi ◽  
Jirina Bartova ◽  
...  
Keyword(s):  
Porphyromonas Gingivalis ◽  
Anaerobic Bacterium ◽  
Bacterial Species ◽  
Host Immunity ◽  
Oral Microbiome ◽  
Treponema Denticola ◽  
High Cell ◽  
Periodontal Pathogens ◽  
Gram Negative ◽  
Cell Numbers

Porphyromonas gingivalisis a Gram-negative oral anaerobe that is involved in the pathogenesis of periodontitis and is a member of more than 500 bacterial species that live in the oral cavity. This anaerobic bacterium is a natural member of the oral microbiome, yet it can become highly destructive (termed pathobiont) and proliferate to high cell numbers in periodontal lesions: this is attributed to its arsenal of specialized virulence factors. The purpose of this review is to provide an overview of one of the main periodontal pathogens—Porphyromonas gingivalis.This bacterium, along withTreponema denticolaandTannerella forsythia, constitute the “red complex,” a prototype polybacterial pathogenic consortium in periodontitis. This review outlinesPorphyromonas gingivalisstructure, its metabolism, its ability to colonize the epithelial cells, and its influence upon the host immunity.

Dynamic Evolution of the Microbial Community in BIOX Leaching Tanks

2013 ◽  
Vol 825 ◽  
pp. 331-334 ◽  
Author(s):  
Robert P. van Hille ◽  
Nathan van Wyk ◽  
Tamlyn Froneman ◽  
Susan T.L. Harrison
Keyword(s):  
Community Structure ◽  
Ferric Iron ◽  
Gradual Increase ◽  
Dynamic Evolution ◽  
High Cell ◽  
Cell Numbers ◽  
Solids Loading ◽  
Controlled Conditions ◽  
The Stability ◽  
Selection Of

Laboratory scale (7 L) reactors, inoculated with the L. ferriphilum dominated BIOX inoculum, were used to test the stability of the community under controlled conditions. Further, the effect of increased temperature, solids loading and pH fluctuations on the bioleaching performance and community structure were studied. Both performance and community structure remained stable under controlled conditions (41.5°C, 20% solids loading, 7 day residence time). Increasing the solids loading to 31% did not significantly affect performance or community structure. An increase in temperature (2°C every 10 days) did not have a significant effect up to 48°C, but the increase from 48°C to 50°C resulted in the loss of L. ferriphilum and a decrease in leaching performance. A more gradual increase (1°C increments) from 48°C to 50°C resulted in a stable community, dominated by Ac. cupricumulans and Acidithiobacillus caldus. A similar shift in community structure was observed when the pH fell below pH 0.8, but this was transient and L. ferriphilum recovered dominance upon adjustment to a pH > 1.0. A further increase in temperature to 52°C resulted in the loss of At. caldus and the emergence of Sulfobacilli. However, leaching performance under these conditions was poor, despite the presence of over 10 g/L ferric iron. In addition, yeast extract was required to maintain high cell numbers at 52°C. This work has identified a selection of conditions under which the community in BIOX reactors could evolve dynamically towards those communities currently observed in commercial operations.

scholarly journals COMMERCIAL TOBACCO FARMING AND FEMALE SUBORDINATION IN AGRICULTURE: A NIGERIAN CASE STUDY

1992 ◽  
Vol 4 (1) ◽  
Author(s):  
Ademola Babalola
Keyword(s):  
Production System ◽  
Research Note ◽  
Family Structures ◽  
Farm Family ◽  
Tobacco Production ◽  
The Family ◽  
Economic Position ◽  
The Impact

This research note contains the report of an investigation into the impact of commercial flue-cured tobacco farming on the family structures of tobacco growers in a Nigerian rural Yoruba community of Oyo State. Fifty tobacco farm family units served as subjects of investigation. The investigation revealed that with the adoption of commercial tobacco farming, the socio-economic position and role of women in the community have become subordinate to those of their husbands. This development is attributed to the customary practice which requires women to render services on the farms of their husbands whenever their husbands demand such, to the full involvement of women in the flue-cured tobacco production programmes, and to the inability of women to earn independent income in and outside the tobacco production system

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