Adhesion of fimbriated nitrogen-fixing enteric bacteria to roots of grasses and cereals

1986 ◽  
pp. 59-69
Author(s):  
Timo K. Korhonen ◽  
Eeva-Liisa Nurmiaho-Lassila ◽  
Tuula Laakso ◽  
Kielo Haahtela
Keyword(s):  
Enteric Bacteria ◽  
Nitrogen Fixing

scholarly journals Response of soil microflora to impact of heavy metals in zones of influence of railway transport

2016 ◽  
Vol 24 (1) ◽  
pp. 151-156
Author(s):  
N. Bobryk ◽  
M. Kryvtsova ◽  
V. Nikolajchuk ◽  
I. Voloshchuk
Keyword(s):  
Heavy Metals ◽  
Enteric Bacteria ◽  
Fast Response ◽  
Soil Microflora ◽  
Soil Samples ◽  
Railway Track ◽  
Trophic Groups ◽  
Nitrogen Fixing ◽  
Railway Transport ◽  
Microbial Cenoses

Monitoring research on the areas intensively and continuously affected by technogenic loading has remained topical until nowadays. The soil as a basic component of many ecosystems, including the structure of its microbial cenoses, remains an informative index of a system’s overall stability. The areas affected by railway transport have been scarcely studied. Due to the above, the aim of this work has been to establish the transformation regularities of soil microbial cenoses of territories close to railways and to establish the groups of microorganisms that are a sensitive criterion of technogenic vehicular influence. For the purpose of microbiological research, soil samples were taken at different distances from the railway track (0, 25, 50, 100 and250 m) within five monitoring sections of the Tchop – Uzhhorod – Sambor railway (in the territory of Zakarpatska oblast). The number of ecological trophic groups was identified by means of inoculation on nutrient media using the method of serial dilution of soil suspensions. The research showed that in all types of soils that were adjacent to railway tracks, the number of ammonifiers and spore microbiota was high due to the high content of heavy metals (beyond the background levels). Besides, the bacterial microflora on beef-extract agar was characterized by homogeneity with domination of enteric bacteria and spore bacteria. Simultaneously, the numbers of nitrogen-fixing microorganisms, micromycetes, oligonitrophils, amylolytic and pedotrophic microflorae were shown to be low compared to the control. Farther from the railway track, pigmental species of bacteria appeared in the soil samples, attesting to the activity of self-purification processes. Correlation analysis of the data showed that the soil microbiota of the railway-side areas was undergoing changes as affected by heightened contents of heavy metals. Existence of medium and close connections was established between the number of microorganisms of ecological trophic groups and the content of acid-soluble lead forms at the levels of 0.72–1.72 maximum permissible concentrations. It was the nitrogen-fixing microorganisms and microscopic fungi that showed a fast response to heavy metals, which was an indication of their possible use as indicators of the ecological state of technogenically transformed soils. 

Adhesion of fimbriated nitrogen-fixing enteric bacteria to roots of grasses and cereals

1986 ◽  
Vol 90 (1-3) ◽  
pp. 59-69 ◽  
Author(s):  
Timo K. Korhonen ◽  
Eeva-Liisa Nurmiaho-Lassila ◽  
Tuula Laakso ◽  
Kielo Haahtela
Keyword(s):  
Enteric Bacteria ◽  
Nitrogen Fixing

Environmental effects on the growth of nitrogen-fixing bacteria

1972 ◽  
Vol 22 (4) ◽  
pp. 541-558 ◽  
Author(s):  
Susan Hill ◽  
J. W. Drozd ◽  
J. R. Postgate
Keyword(s):  
Environmental Effects ◽  
Nitrogen Fixing ◽  
Nitrogen Fixing Bacteria

Existence and Decontamination of HVC, Infectious Enteric Bacteria and Parasites in Sewaged Soils

2014 ◽  
Vol 3 (1) ◽  
pp. 150-158 ◽  
Author(s):  
Mohey A. Hassanain ◽  
Nawal A. Hassanain ◽  
Esam A. Hobballa ◽  
Fatma H. Abd- El Zaher ◽  
Mohamed Saber M. Saber
Keyword(s):  
Soil Sample ◽  
Potassium Permanganate ◽  
Enteric Bacteria ◽  
Sewage Effluent ◽  
Calcium Hypochlorite ◽  
Sand Soil ◽  
E Coli ◽  
Surface Sample ◽  
Loamy Sand Soil ◽  
Sewage Farm

A surface sample representing a high contaminated loamy sand soil irrigated with sewage effluent since 30 years and was cultivated with artichoke was collected from Abu-Rawash sewage farm. The existence of HVC, enteric infectious bacteria and parasites in sewaged soil found to be negative for the forward and positive for the latter's. Out of the 30 samples separated from the sewaged soil sample, only 3 samples contained parasitic fauna of developed and undeveloped Ascaris (10%) and five samples contained Entamoeba coli. Results showed that the number of Ascaris eggs/gm soil was 0.017 and the number of E. coli/gm was 0.26. Decontamination of soil parasites was effective using either calcium hypochlorite or potassium permanganate. Salmonella, Vibrio and Campelobacter were detected in the high contaminated sewaged soil and survived for 120 days in the sewaged soil under all control and bioremediated treatments irrigated with either sewage effluent or water.

Effects of intercropping with soybean on bacterial and nitrogen-fixing bacterial diversity in the rhizosphere of sugarcane

2014 ◽  
Vol 38 (9) ◽  
pp. 959-969 ◽  
Author(s):  
PENG Dong-Hai ◽  
◽  
◽  
YANG Jian-Bo ◽  
LI Jian ◽  
...  
Keyword(s):  
Bacterial Diversity ◽  
Nitrogen Fixing

Competition between nitrogen-fixing cyanobacteria during phosphorus-limited growth

1995 ◽  
Vol 32 (4) ◽  
pp. 99-101 ◽  
Author(s):  
W. T. (Pim) De Nobel ◽  
N. Staats ◽  
L. R. Mur
Keyword(s):  
Light Intensity ◽  
Competitive Advantage ◽  
Future Study ◽  
Nitrogen Fixing ◽  
Limited Growth

The phosphorus-limited growth of cultures of the nitrogen-fixing cyanobacteria Aphanizomenon and Anabaena was investigated. In conditions of nutrient and light excess Anabaena has a competitive advantage. The lower the light intensity conditions at which Aphanizomenon populations dominate are indicated for future study.

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