scholarly journals Characterization of rhizospheric and non rhizospheric bacteria from arsenic contaminated soil

2019 ◽  
Vol 8 (1) ◽  
pp. 9-15
Author(s):  
Umma Mayda ◽  
Nazifa Tasnim ◽  
Rasheda Yasmin Shilpi
Keyword(s):  
Contaminated Soil ◽  
Soil Bacteria ◽  
Arsenic Concentration ◽  
Pteris Vittata ◽  
Experimental Result ◽  
Rhizospheric Soil ◽  
Rhizospheric Bacteria ◽  
Number Of Microorganisms ◽  
Number Of Bacteria

The rhizosphere soil has a large and various number of microorganisms especially the bacteria. This experiment was conducted at the department of Botany, Jahangirnagar University, Savar, to investigate the rhizospheric and non-rhizospheric bacteria from arsenic contaminated soil. Pteris vittata was treated with different concentrations of arsenic ranges from 5000 to 10000 ppm in the pot. The experimental result indicated that the negative correlation between arsenic concentration and rhizospheric soil bacteria. Highest number of bacteria (8.6×108 cfu/g) were found in rhizospheric soil (control), while lowest numbers of bacteria (4.0×107 cfu/g) were found in the non-rhizospheric soil with 10000 ppm arsenic. Thirty bacteria were isolated from rhizospheric and non-rhizospheric soil samples. Out of thirty samples Bacillus and Pseudomonas were selected on the basis of morphological and biochemical nature. The present study concluded that the arsenic has an adverse effect on the growth of rhizospheric soil bacteria. Jahangirnagar University J. Biol. Sci. 8(1): 9-15, 2019 (June)

Some Bacteriological Relations in Soils kept under Green-house conditions

1910 ◽  
Vol 3 (3) ◽  
pp. 301-310 ◽  
Author(s):  
Jacob G. Lipman ◽  
Irving L. Owen
Keyword(s):  
Organic Matter ◽  
Soil Bacteria ◽  
Atmospheric Oxygen ◽  
Intimate Contact ◽  
Soil Particles ◽  
Green House ◽  
Direct Knowledge ◽  
Field Soils ◽  
Number Of Microorganisms ◽  
Number Of Bacteria

Soils in the green-house are exposed to conditions that are admittedly more or less artificial. The range of temperature and moisture is not the same as that in field soils, while the aeration of green-house soils is, if anything, even more artificial. The artificial conditions are emphasized still more strongly when the soil is kept in small pots. The operations incident to the filling of the pots and the applications of fertilizers involve a more intimate contact of the soil particles with atmospheric oxygen than is possible under field or garden conditions. This leads to an abnormal multiplication of the soil bacteria and to a consequent abnormally rapid oxidation of the organic matter. In the course of time the more readily decomposable portions of the organic matter in the soil become depleted and this is followed, in turn, by a decline in the numbers of bacteria that will grow on agar plates. It is possible that the rapid falling off in numbers is due not merely to the depletion of the readily decomposable organic matter, but also to the accumulation of certain cleavage products injurious to the bacteria. Of the latter factor we have no direct knowledge and it is referred to in this place only as a possible explanation of the facts recorded below. It may be added here, also, that the greatly decreased number of bacteria appearing on agar plates should not be accepted as absolute proof that the total number of microorganisms in the soil had diminished. There is a possibility that a compensating increase had occurred of bacteria that do not grow on agar plates, as for instance, the nitrous and nitric ferments, etc.….

scholarly journals Comparative Study of the Rhizospheric Microflora of Sunflower Cultivars Helianthus annuus (Asteráceae, Magnoliópsida) Grown on Soils with Anthropogenic Polyelemental Anomalies

2021 ◽  
pp. 442-458
Author(s):  
A. Yu. Muratova ◽  
N. A. Zelenova ◽  
I. Yu. Sungurtseva ◽  
S. V. Gorelova ◽  
A. P. Kolbas ◽  
...  
Keyword(s):  
Helianthus Annuus ◽  
Contaminated Soil ◽  
Soil Microflora ◽  
Cultivar Differences ◽  
Plant Genotype ◽  
Number Of Microorganisms ◽  
Rhizospheric Microorganisms ◽  
Quantitative Changes ◽  
Number Of Bacteria ◽  
Stimulation Of

In a laboratory pot experiment, two mutant cultivars of sunflower (Helianthus annuus cv. r2p2 and Helianthus annuus cv. r5n1) were grown on soils with anthropogenic polyelemental anomalies and on a background control soil, and a comparative analysis of their rhizospheric microflora was carried out. The numbers of soil bacteria, actinomycetes and micromycetes, as well as the numbers of rhizospheric microorganisms resistant to Zn2+, Pb2+, and Cu2+ ions were estimated in the rhizosphere of sunflower cultivars. Quantitative changes in the sunflower rhizospheric microboceno-ses, formed under the influence of both the plant genotype and technogenic soil pollution, were revealed. A pronounced stimulation of the rhizospheric microorganisms of all groups studied was found when plants were cultivated on the technogenically contaminated soil from PJSC Kosogorsk Metallurgical Plant. In this case, cultivar differences were observed, namely: the maximal number of bacteria and actinomycetes was revealed in the rhizosphere of H. annuus cv. r2p2, whilst the maximal number of micromycetes was revealed in the rhizosphere of H. annuus cv. r5n1. An increased number of microorganisms resistant to lead ions was revealed in the rhizosphere of H. annuus cv. r2p2. The observed changes in the structure of rhizospheric microbial communities of the sunflower cultivars manifested in the stimulation of the growth and activity of soil microflora can be in demand for phytoremediation of technogenically contaminated soil.

Biodegradation of diphenylarsinic acid to arsenic acid by novel soil bacteria isolated from contaminated soil

2009 ◽  
Vol 21 (3) ◽  
pp. 491-499 ◽  
Author(s):  
Naoki Harada ◽  
Kazuhiro Takagi ◽  
Koji Baba ◽  
Kunihiko Fujii ◽  
Akio Iwasaki
Keyword(s):  
Contaminated Soil ◽  
Soil Bacteria ◽  
Arsenic Acid

Synthesis and Infrared Spectrum Characterization of Phenylalanine Chelated Calcium Complex

2011 ◽  
Vol 396-398 ◽  
pp. 1549-1553
Author(s):  
Yu Qi Wu ◽  
Lian Jin Weng ◽  
Yuan Yuan Han ◽  
Xin Yang ◽  
Di Geng
Keyword(s):  
Infrared Spectrum ◽  
Chelate Ring ◽  
Uniform Design ◽  
Water System ◽  
Experimental Result ◽  
Molar Ratio ◽  
Optimal Parameters ◽  
Single Factor ◽  
Preparation Conditions

The preparation conditions in the water system of phenylalanine chelated calcium complex have been evaluated though single-factor tests and optimized by uniform design. Then the optimal parameters were obtained as follows: reaction temperature is 40 °C, reaction time is 182 min, the molar ratio of phenylalanine to calcium is 4.3 and pH = 9.0. Under the best conditions, the experimental result gives chelating rate = 87.40% that is 17.12% lower than the prediction = 104.52%.The infrared spectrum characterization has confirmed the formation of phenylalanine-Ca2+ chelates and the existence of chelate ring.

The Ferroelectric and Electrical Properties of CaBi4Ti4O15 Thin Films Prepared by Sol-Gel Technology

2011 ◽  
Vol 239-242 ◽  
pp. 891-894 ◽  
Author(s):  
Tsung Fu Chien ◽  
Jen Hwan Tsai ◽  
Kai Huang Chen ◽  
Chien Min Cheng ◽  
Chia Lin Wu
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Sol Gel ◽  
Morphological Characterization ◽  
Experimental Result ◽  
X Ray Diffraction ◽  
Solution Deposition ◽  
Capacitance Voltage ◽  
Preferential Crystal Orientation

In this study, thin films of CaBi4Ti4O15with preferential crystal orientation were prepared by the chemical solution deposition (CSD) technique on a SiO2/Si substrate. The films consisted of a crystalline phase of bismuth-layer-structured dielectric. The as-deposited CaBi4Ti4O15thin films were crystallized in a conventional furnace annealing (RTA) under the temperature of 700 to 800°C for 1min. Structural and morphological characterization of the CBT thin films were investigated by X-ray diffraction (XRD) and field-emission scanning electron microscope (FE-SEM). The impedance analyzer HP4294A and HP4156C semiconductor parameters analyzer were used to measurement capacitance voltage (C-V) characteristics and leakage current density of electric field (J-E) characteristics by metal-ferroelectric-insulator- semiconductor (MFIS) structure. By the experimental result the CBT thin film in electrical field 20V, annealing temperature in 750°C the CBT thin film leaks the electric current is 1.88x10-7A/cm2and the memory window is 1.2V. In addition, we found the strongest (119) peak of as-deposited thin films as the annealed temperature of 750°C

Characterization of bacterial community in oil-contaminated soil and its biodegradation efficiency of high molecular weight (>C40) hydrocarbon

Chemosphere ◽  
2021 ◽  
pp. 133168
Author(s):  
Balakrishnan Muthukumar ◽  
Punniyakotti Parthipan ◽  
Mohamad S. AlSalhi ◽  
Nataraj Srinivasa Prabhu ◽  
T. Nageswara Rao ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Bacterial Community ◽  
High Molecular Weight ◽  
Contaminated Soil ◽  
Biodegradation Efficiency

Isolation and characterization of soil bacteria able to rapidly degrade the organophosphorus nematicide fosthiazate

2019 ◽  
Vol 68 (2) ◽  
pp. 149-155 ◽  
Author(s):  
S. Lagos ◽  
C. Perruchon ◽  
A. Katsoula ◽  
D.G. Karpouzas
Keyword(s):  
Soil Bacteria ◽  
Isolation And Characterization
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