scholarly journals UTILIZATION OF A MAGNETIC FIELD TO STUDY THE ACTIVITY OF ACIDITHIOBACILLUS FERROOXIDANS FROM MINE WATER

2011 ◽  
Author(s):  
Petr Jandacka
Keyword(s):  
Magnetic Field ◽  
Mine Water ◽  
Acidithiobacillus Ferrooxidans

Enrichment of "Ferrovum" spp. and Gallionella Relatives Using Artificial Mine Water

2013 ◽  
Vol 825 ◽  
pp. 54-57 ◽  
Author(s):  
Judith Kipry ◽  
Rawaa Jaffer Jwair ◽  
Nadja Gelhaar ◽  
Claudia Wiacek ◽  
Eberhard Janneck ◽  
...  
Keyword(s):  
Microbial Community ◽  
Mine Water ◽  
Acidithiobacillus Ferrooxidans ◽  
Pilot Plant ◽  
Iron Oxidation ◽  
Iron Phosphate ◽  
Lower Number ◽  
Mine Waters ◽  
Culture Independent ◽  
Respective Species

New acidophilic iron-oxidising bacteria likeFerrovumspp. andGallionellarelatives have recently been detected in several mine waters by culture-independent methods. To get information about their physiological characteristics, isolation of respective species is required. In former isolation studies, using a previously described iron-containing medium (iFeo) combined with the overlay-plate technique, mainlyAcidithiobacillus ferrooxidansorA. ferrivoranshad been obtained, althoughF. myxofaciensdominated the microbial community. Therefore, a new medium, called APPW was designed based on the water chemistry of a pilot plant for iron oxidation. The growth of iron-oxidising bacteria on overlay plates with iFeo and APPW media, respectively, was compared. Additionally, the iron, phosphate, and ammonium concentrations of APPW were separately adapted to iFeo. Colonies grown were analysed by PCR with primers specific forFerrovumspp.,Gallionellarelatives,Acidithiobacillusspp., andAcidiphiliumspp. While on all media most colonies obtained were contaminated by heterotrophicAcidiphiliumspp., on iFeoAcidithiobacillus, as expected, turned out to be the dominating genus among the iron oxidisers. Interestingly on APPW and APPW-NH4Ferrovumdominated among the iron oxidisers. While APPW-Fe, as compared to APPW, seemed to inhibit theGallionellarelatives, APPW-PO4resulted in an overall lower number of colonies, but a higher percentage of this taxon.

Explore the Effects of Magnetic Field Intensity Change on Acidithiobacillus ferrooxidans Growth and Magnetism

2010 ◽  
Vol 152-153 ◽  
pp. 1783-1787
Author(s):  
Lin Wang ◽  
Hong Xu Li ◽  
Yun Chi Guo ◽  
An Li
Keyword(s):  
Magnetic Field ◽  
Acidithiobacillus Ferrooxidans ◽  
Magnetic Field Intensity ◽  
External Environment ◽  
Intensity Change ◽  
Environment Change ◽  
Synthesis Mechanism ◽  
Strength Change ◽  
The Times ◽  
Mineral Leaching

All the times we study a lot about Acidithiobacillus ferrooxidans (A.f) in mineral leaching, but when it is discovered that it can synthesize magnetosomes(Ms) in its body, researchers start to pay attention to its synthesis mechanism of Ms, while there is still few studies about the influence to A.f by external environment change. This article mainly aims at exploring the influence on A.f growth and magnetism under the outside magnetic field strength change. The findings show that not all A.f can synthesize magnetic substance. Under the most primary culture, there are few thalli can synthesize Ms; magnetic field at about 5mT, 10mT may promote thalli growth (quantity); magnetic field at about 25mT and 30mT may be harmful or beneficial to thalli response to time length; magnetic field at about 15mT, 20mT, 35mT, 40mT, 50mT may restrain thalli growth and reduce thalli activeness.

The Effect of Applied Magnetic Field on the Mine Water Coagulation

2014 ◽  
Vol 522-524 ◽  
pp. 1021-1026 ◽  
Author(s):  
Zhe Guo ◽  
Jian Guo Cui ◽  
Gang Wei
Keyword(s):  
Magnetic Field ◽  
Surface Tension ◽  
Water Treatment ◽  
Field Strength ◽  
Magnetic Field Strength ◽  
Field Intensity ◽  
Mine Water ◽  
Magnetic Field Intensity ◽  
Mine Water Treatment ◽  
The Magnetic Field

It is significant to use different techniques to improve the overall efficiency of mine water treatment, because the utilization rate of treated mine water is low and the treating cost is high. According to the characteristics of water quality of coal mine water, the influence of the magnetic field on mine water treatment was studied in this paper in order to provide a reference for mine water treatment. It was found that magnetic field has effect on surface tension and electrical conductivity of mine water. When the magnetic field strength is less than 0.3T, the surface tension of the mine water decreases with the increase of magnetic field intensity, while the magnetic field strength is more than 0.3T, the surface tension of the mine water increases with the increase of magnetic field intensity. In the range of 0.0T ~ 0.5T, the mine water conductivity increases with the increase of magnetic field intensity and, as high as 14.8 ms/cm, then along with the increase of magnetic field intensity, the conductivity remains same. The influence of magnetic field intensity, amount of coagulant and magnetization time on coagulation were studied in this paper, and their effect were also investigated by Orthogonal test. The results show that when the magnetic field intensity is 0.35 T, magnetization time is 4 min and the amount of coagulant is 3 ml/L, the coagulation effect is the best. Under the condition, the mine water turbidity fell to 0.85 NTU from 200 NTU.

Magnetic-field strengths from optical polarization data

1967 ◽  
Vol 31 ◽  
pp. 381-383
Author(s):  
J. M. Greenberg
Keyword(s):  
Magnetic Field ◽  
Optical Polarization ◽  
Polarization Data ◽  
Term Model ◽  
Source Of Information ◽  
Field Strengths

Van de Hulst (Paper 64, Table 1) has marked optical polarization as a questionable or marginal source of information concerning magnetic field strengths. Rather than arguing about this–I should rate this method asq+-, or quarrelling about the term ‘model-sensitive results’, I wish to stress the historical point that as recently as two years ago there were still some who questioned that optical polarization was definitely due to magnetically-oriented interstellar particles.

Observing the galactic magnetic field

1967 ◽  
Vol 31 ◽  
pp. 375-380
Author(s):  
H. C. van de Hulst
Keyword(s):  
Magnetic Field ◽  
Fair Agreement ◽  
Solar Neighbourhood ◽  
Galactic Magnetic Field ◽  
The Magnetic Field

Various methods of observing the galactic magnetic field are reviewed, and their results summarized. There is fair agreement about the direction of the magnetic field in the solar neighbourhood:l= 50° to 80°; the strength of the field in the disk is of the order of 10-5gauss.

Structure in the radiation of the galactic disk

1967 ◽  
Vol 31 ◽  
pp. 355-356
Author(s):  
R. D. Davies
Keyword(s):  
Magnetic Field ◽  
Galactic Disk ◽  
Galactic Magnetic Field ◽  
Measured Polarization

Observations at various frequencies between 136 and 1400 MHz indicate a considerable amount of structure in the galactic disk. This result appears consistent both with measured polarization percentages and with considerations of the strength of the galactic magnetic field.

Calculated Coronal Magnetic Fields and Their Comparison with the Coronal Structures as Observed during Five Solar Eclipses

1994 ◽  
Vol 144 ◽  
pp. 559-564
Author(s):  
P. Ambrož ◽  
J. Sýkora
Keyword(s):  
Magnetic Field ◽  
Solar Cycle ◽  
Magnetic Fields ◽  
Solar Corona ◽  
Coronal Magnetic Field ◽  
Coronal Magnetic Fields ◽  
Solar Eclipses ◽  
Coronal Structures

AbstractWe were successful in observing the solar corona during five solar eclipses (1973-1991). For the eclipse days the coronal magnetic field was calculated by extrapolation from the photosphere. Comparison of the observed and calculated coronal structures is carried out and some peculiarities of this comparison, related to the different phases of the solar cycle, are presented.

Faint Hα Emission in the Corona and Its Relation to the Prominences

1994 ◽  
Vol 144 ◽  
pp. 339-342
Author(s):  
V. N. Dermendjiev ◽  
Z. Mouradian ◽  
J.- L. Leroy ◽  
P. Duchlev
Keyword(s):  
Magnetic Field ◽  
Solar Corona ◽  
Essential Role ◽  
Hα Emission

AbstractThe relation between episodically observed in the solar corona faint Hαemission structures and the long lived prominences was studied. Particular consideration was given for cases in which the corresponding prominences had undergone DB process. An MHD interpretation of the phenomenon “emissions froides” (cool emission) is proposed in which an essential role plays the prominence supporting magnetic field.

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