scholarly journals Effect of a static magnetic field on the microscopic characteristics of highly efficient oil-removing bacteria

2017 ◽  
Vol 77 (2) ◽  
pp. 296-303 ◽  
Author(s):  
Zhijun Ren ◽  
Xiaodong Leng ◽  
Qian Liu
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Cell Membrane ◽  
Static Magnetic Field ◽  
Cell Permeability ◽  
Cell Membrane Permeability ◽  
Oil Removal ◽  
Low Intensity ◽  
Highly Efficient ◽  
Acinetobacter Sp

Abstract To better understand the microbial oil removal enhancement process by a magnetic field, the effect of a static magnetic field (SMF) on the microscopic characteristics of highly efficient biodegradation oil-removing bacteria was studied. The Acinetobacter sp. B11 strain with a 53.6% oil removal rate was selected as the reference bacteria. The changes in the microscopic characteristics of Acinetobacter sp. B11 such as the cell surface morphology, cell permeability and cell activity of the bacteria were investigated. The results showed that low-intensity magnetic fields (15–35 mT) improved the ability of Acinetobacter sp. B11 to remove oil by 11.9% at 25 mT compared with that of bacteria with no magnetic field. Without destroying the cell membrane, the low-intensity magnetic fields increased the cell membrane permeability and improved the activity of superoxide dismutase (SOD), which effectively enhanced the oil degradation performance of the bacteria.

scholarly journals Novel static magnetic field effects on green chemistry biosynthesis of silver nanoparticles in Saccharomyces cerevisiae

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Ameni Kthiri ◽  
Selma Hamimed ◽  
Abdelhak Othmani ◽  
Ahmed Landoulsi ◽  
Siobhan O’Sullivan ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Saccharomyces Cerevisiae ◽  
Silver Nanoparticles ◽  
Magnetic Fields ◽  
Green Chemistry ◽  
Static Magnetic Field ◽  
Culture Medium ◽  
Average Diameter ◽  
Magnetic Field Effects ◽  
Static Magnetic Fields

AbstractThe bacteriocidal properties of silver nanoparticles (AgNPs) depend on their average diameter (toxicity increases with decreasing diameter). In the present work, we describe novel green chemistry biosynthesis of AgNPs from AgNO3 added to cell-free culture medium of baker’s yeast, Saccharomyces cerevisiae, yielding nanoparticles in the range 11–25 nm. However, when yeast was grown in a moderate static magnetic field, AgNPs obtained from the resulting cell-free culture medium, were significantly smaller (2–12 nm) than those obtained without magnetic field. These latter nanoparticles were highly crystalline, stable and near-uniform shape. Furthermore, the antibacterial activity of AgNPs obtained from static magnetic fields were greater than those from control cultures. Static magnetic fields show a promising ability to generate biocidal nanoparticles via this novel green chemistry approach.

EFFECTS OF HERBICIDES OF DIFFERENT MODES OF ACTION ON LEAF-CELL MEMBRANE PERMEABILITY IN PHASEOLUS VULGARIS

1980 ◽  
Vol 60 (2) ◽  
pp. 613-620 ◽  
Author(s):  
JACINTA CROWLEY ◽  
G. N. PRENDEVILLE
Keyword(s):  
Phaseolus Vulgaris ◽  
Cell Membrane ◽  
Membrane Permeability ◽  
Leaf Damage ◽  
Cell Permeability ◽  
Cell Membrane Permeability ◽  
Leaf Cell ◽  
Visible Injury ◽  
Modes Of Action ◽  
2,4 Dichlorophenoxyacetic Acid

Leakage of electrolytes from leaf discs of treated Phaseolus vulgaris L. plants was used to study the effects of several herbicides of different modes of action on leaf-cell membrane permeability. Linuron (N-(3,4-dichlorophenyl)-N-methoxy-N-methylurea), prometryne (4,6-bisisopropylamino-2-methylthio-1,3,5-triazine), bromacil (5,bromo-6-methyl-3-(1-methyl-n-propyl) uracil), sodium azide and dalapon (2,2-dichloropropionic acid) increased leaf-cell permeability at 24 h after treatment and this occurred without appearance of leaf necrosis. Glyphosate (N-(phosphonomethyl) glycine) increased leaf-cell permeability at 96 h and this was always associated with visible injury, including wilting. Paraquat (1,1-dimethyl-4,4-bipyridylium) at 10−5M increased leaf-cell permeability 48 h after treatment, without apparent leaf damage, but at higher concentrations, increased permeability was always associated with visible effects. Chlorpropham (isopropyl N-(d)3-chlorophenyl) carbamate), picloram (4-amino-3,5,6-trichloropicolinic acid) and 2,4-D (2,4-dichlorophenoxyacetic acid) did not alter cell permeability even though epinastic symptoms in leaves became evident 24 h after treatment with picloram and 2,4-D.

Shielding from external magnetic fields by rotating magnetic conducting cylindrical shells

2015 ◽  
Vol 34 (2) ◽  
pp. 505-513
Author(s):  
Marcin Ziolkowski ◽  
Stanislaw Gratkowski
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Static Magnetic Field ◽  
Analytical Solutions ◽  
Separation Of Variables ◽  
Shielding Effect ◽  
Magnetic Vector Potential ◽  
Content Type ◽  
Shielding Factor ◽  
Cylindrical Screen

Purpose – In many different engineering fields often there is a need to protect regions from electromagnetic interference. According to static and low-frequency magnetic fields the common strategy bases on using a shield made of conductive or ferromagnetic material. Another screening technique uses solenoids that generate an opposite magnetic field to the external one. The purpose of this paper is to discuss the shielding effect for a magnetic and conducting cylindrical screen rotating in an external static magnetic field. Design/methodology/approach – The magnetic flux density is expressed in terms of the magnetic vector potential. Applying the separation of variables method analytical solutions are obtained for an infinitely long magnetic conducting cylindrical screen rotating in a uniform static transverse magnetic field. Findings – Analytical formulas of the shielding factor for a cylindrical screen of arbitrary conductivity and magnetic permeability are given. A magnetic Reynolds number is found to be an appropriate indication of the change in magnetic field inside the screen. Useful simplified expressions are presented. Originality/value – This paper treats in a qualitative way the possibility of static magnetic field shielding by using rotating conducting magnetic cylindrical screens. Analytical solutions are given. If the angular velocity is equal to zero or the relative permeability of the shield is equal to one the shielding factor has forms well known from literature.

scholarly journals Static Magnetic Field Attenuates Lipopolysaccharide-Induced Inflammation in Pulp Cells by Affecting Cell Membrane Stability

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
Sung-Chih Hsieh ◽  
Jeng-Ting Tsao ◽  
Wei-Zhen Lew ◽  
Ya-Hui Chan ◽  
Lin-Wen Lee ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Cell Membrane ◽  
Inflammatory Response ◽  
Static Magnetic Field ◽  
Dental Pulp ◽  
Membrane Stability ◽  
Dental Pulp Cells ◽  
Multilineage Differentiation ◽  
Cell Membrane Stability ◽  
Pulp Cells

One of the causes of dental pulpitis is lipopolysaccharide- (LPS-) induced inflammatory response. Following pulp tissue inflammation, odontoblasts, dental pulp cells (DPCs), and dental pulp stem cells (DPSCs) will activate and repair damaged tissue to maintain homeostasis. However, when LPS infection is too serious, dental repair is impossible and disease may progress to irreversible pulpitis. Therefore, the aim of this study was to examine whether static magnetic field (SMF) can attenuate inflammatory response of dental pulp cells challenged with LPS. In methodology, dental pulp cells were isolated from extracted teeth. The population of DPSCs in the cultured DPCs was identified by phenotypes and multilineage differentiation. The effects of 0.4 T SMF on DPCs were observed through MTT assay and fluorescent anisotropy assay. Our results showed that the SMF exposure had no effect on surface markers or multilineage differentiation capability. However, SMF exposure increases cell viability by 15%. In addition, SMF increased cell membrane rigidity which is directly related to higher fluorescent anisotropy. In the LPS-challenged condition, DPCs treated with SMF demonstrated a higher tolerance to LPS-induced inflammatory response when compared to untreated controls. According to these results, we suggest that 0.4 T SMF attenuates LPS-induced inflammatory response to DPCs by changing cell membrane stability.

Effect of a static magnetic field on the preparation of MnOOH and Mn3O4 by a hydrothermal process

RSC Advances ◽  
2016 ◽  
Vol 6 (25) ◽  
pp. 21037-21042 ◽  
Author(s):  
L. C. Dong ◽  
Y. B. Zhong ◽  
S. Zhe ◽  
T. Y. Zheng ◽  
H. Wang
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Static Magnetic Field ◽  
Hydrothermal Process ◽  
Single Crystalline ◽  
20 Nm ◽  
The Magnetic Field

In this paper, the shape of the samples was changed by the magnetic field. Single-crystalline nanowires (20 nm in diameter and 1 μm in length) of MnOOH were obtained under zero magnetic fields. However, cubic particles of Mn3O4 were formed when a magnetic field was applied.

scholarly journals Response of isolated buccal epithelium cells on the combined action of anti-tumor antibiotic doxorubicin and magnetic field

2020 ◽  
pp. 14-23
Author(s):  
D Miroshnik ◽  
◽  
Y Shckorbatov ◽  
Keyword(s):  
Magnetic Field ◽  
Cell Membrane ◽  
Membrane Permeability ◽  
Defense Mechanisms ◽  
Protective Action ◽  
Cell Membrane Permeability ◽  
Antitumor Antibiotic ◽  
Cell Nuclei ◽  
Protective Mechanisms ◽  
The Magnetic Field

The combined effect of doxorubicin and magnetic field on the viability of isolated buccal epithelial cells two donors was investigated. Doxorubicin is an effective antitumor antibiotic, but this drug has a large amount of side effects. This significantly reduces the number of cases when you can change the drug. To reduce the toxic effect or to increase the effectiveness of anticancer therapy, the introduction of additional substances is used. For a long time, magnetic and electromagnetic fields have been used as a therapeutic factor by three therapies for cancer alone, or as an adjunct. Doxorubicin at a concentration of 2 μg/ml for 2 hours has been shown to increase of cell membrane permeability and heterochromatin granule quantity in cell nuclei. Exposure of cells to 25 mT magnetic field for 30 and 60 minutes results in decrease in cell viability and increase in cell membrane permeability and the number of heterochromatin granules in nuclei. Combined exposure to static magnetic field and doxorubicin results in decrease of the number of heterochromatin granules in the nuclei of cells from one of the donors, as compared to the variant of exposure only to doxorubicin, which indicates the protective effect of the magnetic field. A possible mechanism of the protective action of the magnetic field in our experiments is that the stress under the influence of the magnetic field activates the protective mechanisms of the cell (including the transition of chromatin to a heterochromatinized state). That way, been pre-activated due to the action of the magnetic field, the defense mechanisms of the cell reduce the toxic effects caused by doxorubicin.

scholarly journals Quantum Hall–based superconducting interference device

2019 ◽  
Vol 5 (9) ◽  
pp. eaaw8693 ◽  
Author(s):  
Andrew Seredinski ◽  
Anne W. Draelos ◽  
Ethan G. Arnault ◽  
Ming-Tso Wei ◽  
Hengming Li ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Josephson Junction ◽  
Landau Level ◽  
Carrier Density ◽  
Filling Factor ◽  
Quantum Hall ◽  
Edge States ◽  
Highly Efficient ◽  
Wide Range

We present a study of a graphene-based Josephson junction with dedicated side gates carved from the same sheet of graphene as the junction itself. These side gates are highly efficient and allow us to modulate carrier density along either edge of the junction in a wide range. In particular, in magnetic fields in the 1- to 2-T range, we are able to populate the next Landau level, resulting in Hall plateaus with conductance that differs from the bulk filling factor. When counter-propagating quantum Hall edge states are introduced along either edge, we observe a supercurrent localized along that edge of the junction. Here, we study these supercurrents as a function of magnetic field and carrier density.

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