The accumulation of heavy metals by terrestrial nitrogen-fixing alga Nostoc commune Vauch. in the East European Tundra

2000 ◽  
Vol 2 (3) ◽  
pp. 11-18 ◽  
Author(s):  
E. N. Patova ◽  
M. D. Sivkov ◽  
M. V. Getzen
Keyword(s):  
Heavy Metals ◽  
Nitrogen Fixing ◽  
Nostoc Commune ◽  
East European

Nitrogen-fixing blue-green algae in acid forest and nursery soils

1968 ◽  
Vol 14 (11) ◽  
pp. 1179-1183 ◽  
Author(s):  
M. F. Jurgensen ◽  
C. B. Davey
Keyword(s):  
Forest Soils ◽  
Atlantic Coast ◽  
Appalachian Mountains ◽  
Soil Surface ◽  
Nostoc Muscorum ◽  
Algal Flora ◽  
Nitrogen Fixing ◽  
Nostoc Commune ◽  
Blue Green Algae ◽  
Green Algal

Algal populations were studied in soils from sites representing several major forest types ranging from the spruce–fir forests in the Appalachian Mountains to the Southern pine forests along the Atlantic Coast. In addition, the nitrogen-fixing blue-green algal population of a forest tree nursery was examined.The results of this investigation indicate a general lack of nitrogen-fixing algae in acid forest soils. However, a pronounced development of these algae was observed in the acid nursery soil, especially on the soil surface. Low numbers of algae were found in some forest soils but only when the soil was above pH 5.4. No nitrogen-fixing Cyanophyceae were isolated from soils in the Appalachian Mountains regardless of soil acidity. Nostoc muscorum was the most common nitrogen-fixing species occurring under both forest and nursery conditions. Nostoc commune was isolated only from the nursery soil. Several strains of Nostoc ellipsosporum were obtained from a mixed hardwood–softwood site. An examination of the algal flora of a number of Alaskan tundra soils gave results similar to those found in the forest soils.

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. 

scholarly journals Response of plants and nitrogen-fixing symbiosis to the toxicity of cadmium and mercury using the pea mutant SGECdt

2020 ◽  
Author(s):  
A. A. Belimov ◽  
A. I. Shaposhnikov ◽  
D. S. Syrova ◽  
P. V. Guro ◽  
O. S. Yuzikhin ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Elemental Composition ◽  
Root Exudation ◽  
Combined Effect ◽  
Nitrogen Fixing ◽  
Tolerance Mechanisms ◽  
Pea Mutant

The combined effect of Hg and Cd on the growth, elemental composition, root exudation and interactions with rhizobia of pea SGE and its mutant SGECdt was studied in hydroponics and sand. The tolerance mechanisms of legume-rhizobia symbiosis to heavy metals are discussed.

Sampling and analysis of the air-water interface with SEM and EDS of microlayers

1989 ◽  
Vol 47 ◽  
pp. 1004-1005
Author(s):  
Randall W. Smith ◽  
John Dash
Keyword(s):  
Heavy Metals ◽  
Surface Microlayer ◽  
Surface Films ◽  
Water Interface ◽  
Physical Processes ◽  
Infrared Spectroscopic Analysis ◽  
Eds Analysis ◽  
Air Water Interface ◽  
Significant Area ◽  
Bulk Chemical

The structure of the air-water interface forms a boundary layer that involves biological ,chemical geological and physical processes in its formation. Freshwater and sea surface microlayers form at the air-water interface and include a diverse assemblage of organic matter, detritus, microorganisms, plankton and heavy metals. The sampling of microlayers and the examination of components is presently a significant area of study because of the input of anthropogenic materials and their accumulation at the air-water interface. The neustonic organisms present in this environment may be sensitive to the toxic components of these inputs. Hardy reports that over 20 different methods have been developed for sampling of microlayers, primarily for bulk chemical analysis. We report here the examination of microlayer films for the documentation of structure and composition.Baier and Gucinski reported the use of Langmuir-Blogett films obtained on germanium prisms for infrared spectroscopic analysis (IR-ATR) of components. The sampling of microlayers has been done by collecting fi1ms on glass plates and teflon drums, We found that microlayers could be collected on 11 mm glass cover slips by pulling a Langmuir-Blogett film from a surface microlayer. Comparative collections were made on methylcel1ulose filter pads. The films could be air-dried or preserved in Lugol's Iodine Several slicks or surface films were sampled in September, 1987 in Chesapeake Bay, Maryland and in August, 1988 in Sequim Bay, Washington, For glass coverslips the films were air-dried, mounted on SEM pegs, ringed with colloidal silver, and sputter coated with Au-Pd, The Langmuir-Blogett film technique maintained the structure of the microlayer intact for examination, SEM observation and EDS analysis were then used to determine organisms and relative concentrations of heavy metals, using a Link AN 10000 EDS system with an ISI SS40 SEM unit. Typical heavy microlayer films are shown in Figure 3.

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