1
|
Popović T, Matavulj M, Nežić L, Radulović TN, Škrbić R. Pulsed electromagnetic field attenuates bone fragility in estrogen-deficient osteoporosis in rats. Technol Health Care 2023:THC220642. [PMID: 36641696 DOI: 10.3233/thc-220642] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
BACKGROUND The pulsed electromagnetic fields (PEMFs) seem effective in increasing bone mineral density and promoting osteogenesis and bone healing. OBJECTIVE To examine the effect of two different modalities of PEMFs therapy in comparison with the recommended pharmacological treatment on experimental osteoporosis in rats. METHODS The experimental model of estrogen-deficient osteoporosis induced by ovariectomy was used in this study. The animals were exposed to PEMFs of various frequencies (40 Hz and 25 Hzk), intensities (10 mT and 36.4 μT), lengths of exposure, and the effects were compared with the standard treatment with pamidronate, vitamin D, and calcium supplementation. RESULTS The application of PEMF40Hz, significantly reduced the osteoporotic bone loss in female rats that were confirmed with biochemical, biomechanical, and histological analyses. These effects were more pronounced than in osteoporotic animals treated with pamidronate, vitamin D, and calcium supplementation. On the contrary, the exposure to PEMF25Hz did not show restorative effects but led to further progression of osteoporosis. CONCLUSION The exposure to PEMF40Hz, significantly restored osteoporosis and attenuated bone fragility in comparison to the rats exposed to PEMF25Hz or those treated with pamidronate, vitamin D, and calcium supplementation.
Collapse
Affiliation(s)
- Tamara Popović
- Institute for Physical Medicine and Rehabilitation "Dr. Miroslav Zotović", Banja Luka, Bosnia and Herzegovina
| | - Milica Matavulj
- Department of Histology and Embryology, Faculty of Medicine, University of Novi Sad, Novi Sad, Serbia
| | - Lana Nežić
- Department of Pharmacology, Toxicology and Clinical Pharmacology, Faculty of Medicine, University of Banja Luka, Banja Luka, Bosnia and Herzegovina
| | - Tatjana Nožica Radulović
- Institute for Physical Medicine and Rehabilitation "Dr. Miroslav Zotović", Banja Luka, Bosnia and Herzegovina
| | - Ranko Škrbić
- Department of Pharmacology, Toxicology and Clinical Pharmacology, Faculty of Medicine, University of Banja Luka, Banja Luka, Bosnia and Herzegovina
| |
Collapse
|
2
|
Al Daccache M, Koubaa M, Maroun RG, Salameh D, Louka N, Vorobiev E. Pulsed electric field-assisted fermentation of Hanseniaspora sp. yeast isolated from Lebanese apples. Food Res Int 2020; 129:108840. [PMID: 32036887 DOI: 10.1016/j.foodres.2019.108840] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2019] [Revised: 11/12/2019] [Accepted: 11/18/2019] [Indexed: 01/26/2023]
Abstract
Hanseniaspora sp. yeast was stimulated using pulsed electric field (PEF) during the different fermentation phases. The impact of PEF parameters on the growth rate and substrate consumption was studied. The PEF intensities chosen for this study were mainly in the range of 72-285 V cm-1. A PEF treatment chamber was designed for this study with a ratio of 1:50 between the volume of the fermenter and the volume of the chamber. It allows the recycling of the culture medium using a peristaltic pump, and the yeast treatment by PEF during the fermentation. The continuous circulation of the medium allows avoiding the increase of the temperature inside the fermenter, the cell aggregation, as well as the agitation and the scale-up issues that are associated with the PEF treatment of the entire volume in batch mode. The maximal yeast growth rate was obtained using an electric field strength of 285 V cm-1 applied during both Lag and early exponential phase, and Log phase. This observation was accompanied by a faster consumption of glucose in the medium during the fermentation. Besides, the sensitivity of Hanseniaspora sp. yeast to PEF treatment was more pronounced during the Lag and early exponential phase than the Log phase. The results obtained exposed the great benefit of stimulating Hanseniaspora sp. yeast using moderate PEF as it reduces the fermentation time along with increasing the biomass concentration.
Collapse
Affiliation(s)
- Marina Al Daccache
- Sorbonne University, Université de technologie de Compiègne, ESCOM, EA 4297 TIMR, Centre de recherche Royallieu, CS 60319, 60203 Compiègne Cedex, France; Faculté des Sciences, Centre d'Analyses et de Recherche, UR TVA, Laboratoire CTA, Université Saint-Joseph, Beyrouth, Lebanon
| | - Mohamed Koubaa
- ESCOM, UTC, EA 4297 TIMR, 1 allée du réseau Jean-Marie Buckmaster, 60200 Compiègne, France.
| | - Richard G Maroun
- Faculté des Sciences, Centre d'Analyses et de Recherche, UR TVA, Laboratoire CTA, Université Saint-Joseph, Beyrouth, Lebanon
| | - Dominique Salameh
- Faculté des Sciences, Centre d'Analyses et de Recherche, UR TVA, Laboratoire CTA, Université Saint-Joseph, Beyrouth, Lebanon
| | - Nicolas Louka
- Faculté des Sciences, Centre d'Analyses et de Recherche, UR TVA, Laboratoire CTA, Université Saint-Joseph, Beyrouth, Lebanon
| | - Eugène Vorobiev
- Sorbonne University, Université de technologie de Compiègne, ESCOM, EA 4297 TIMR, Centre de recherche Royallieu, CS 60319, 60203 Compiègne Cedex, France
| |
Collapse
|
3
|
|
4
|
Ding C, Luo L. Measurement of entropy production in living cells under an alternating electric field. Cell Biol Int 2013; 37:233-8. [PMID: 23364867 DOI: 10.1002/cbin.10017] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2012] [Accepted: 10/31/2012] [Indexed: 11/07/2022]
Abstract
Entropy is a thermodynamic property toward equilibrium based on the dissipation of energy. Cells constitute such a thermodynamic system, in which entropy production is both inevitable and highly significant. Although the experimental measurement of entropy production in a cell is very difficult, a new method to accomplish this in living cells is reported herein. Through heating the sample by alternating electric fields and recording the heat flow from cells, the entropy production in two normal cell lines, MCF10A and HL-7702, and two cancerous cell lines, MDA-MB-231 and SMMC-7721, was measured and compared. The scaled electroinduced entropy production rate (SEEP) of cancer cells monotonically increases with electric field strength at 5-40 V/cm, while that of normal cells changes nonmonotonically with electric field strength, reaching a peak at 5-30 V/cm. For all cell lines, the cancerous-to-normal ratio of field-induced entropy production is clearly <1 in a large range of field strength from 5 to 25 V/cm. Therefore, this work presents an easy and effective strategy for experimentally investigating the thermodynamic properties of the cell, and gives deeper insight into the physical differences between normal and cancerous cells exposed to electric fields.
Collapse
Affiliation(s)
- Changjiang Ding
- Laboratory of Theoretical Biophysics, School of Physical Science and Technology, Inner Mongolia University, Hohhot 010021, China
| | | |
Collapse
|
5
|
Ramírez-Cadavid DA, Galindo-Muñoz AR, Zapata-Ocampo PA, Rojas-Vahos DF, Fernández-Ossa C, Atehortúa-Garcés L. Efecto de los campos eléctricos sobre la producción de biomasa micelial del hongo medicinal <i>Ganoderma lucidum</i> [(W. Curt.: Fr.) P. Karst. (Ganodermataceae)]. ACTUALIDADES BIOLÓGICAS 2012. [DOI: 10.17533/udea.acbi.331479] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Se evaluó el efecto de los campos eléctricos sobre el crecimiento del hongo Ganoderma lucidum [(W. Curt.: Fr.) P. Karst. Ganodermataceae] bajo condiciones de cultivo sumergido, con el objetivo de optimizar su producción de biomasa. Ganoderma lucidum fue expuesto a tres factores diferentes [tipo de campo eléctrico corriente alterna (AC), corriente continua (DC) y corriente pulsada (IM)]; intensidad del campo [siete intensidades de campo desde 0,0 kV cm-1] (cultivo control) hasta 3,0 kV cm-1; y periodo de estimulación [dependiendo de la fase de crecimiento del hongo, después de la inoculación día 0 (fase lag), día 3 (fase exponencial o log) y día 6 (fase estacionaria)]. Los resultados mostraron que la combinación del campo eléctrico AC, con una intensidad de 1,5 kV cm-1 y aplicado al día 3 presentaron una mejor producción de biomasa con una media de 35,6450 ± 0,6684 g l-1, mientras que la combinación de los tres factores tipo de campo eléctrico DC a una intensidad de 2,5 kV cm-1 y aplicado el día 6 presentaron una menor producción de biomasa con una media de 26,2950 ± 3,9926 g l-1. Los anteriores resultados muestran que según la combinación de los factores evaluados es posible estimular la producción de biomasa del hongo Ganoderma lucidum bajo condiciones de cultivo sumergido mediante la aplicación de campo eléctrico.
Collapse
|
6
|
Abstract
There are thousands of experiments in the world of science, but we do not have a uniform system, in which different results from the divergent development of science, as well as from our entire world can be connected to each other in a wholistic way. If divergence predominated over convergence, it would favor destructive and self-disastrous processes. Besides, it is indisputable that such a complex theory must involve the matter of consciousness and of the subconscious, as well as laws of physics, similarly to the concept presented here. According to Neumann's reasoning, and because the brain does not use the language of mathematics, any complex theory should think in terms of tendencies and processes instead of formulas. Therefore, the complex theory described in this paper works in processes. In the first part of this article a possible role of the brain's biopiezoelectric crystals is shown as they could take part in the process of storage of conscious information in a holographic way in the brain. The second part describes a concept of quantum vacuum theory of the unconscious implicit background (subconscious) and its connection with consciousness. In the third part, the global role of virtual particles (scalar waves) in the processes of the brain and in the material world is raised.
Collapse
Affiliation(s)
- ISTVÁN BÓKKON
- National Institute of Chemical Safety, Láng Endre u. 68, Budapest 1238, Hungary
| |
Collapse
|
7
|
Electromagnetically Controlled Biological Assembly of Aligned Bacterial Cellulose Nanofibers. Ann Biomed Eng 2010; 38:2475-84. [DOI: 10.1007/s10439-010-9999-0] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2009] [Accepted: 03/04/2010] [Indexed: 01/09/2023]
|
8
|
Cheung KW, Lado WE, S. Martin L, St-Pierre LS, A. Persing M. Cerebral Neurons in Rattus norvegicus Following a Mild Impact to the Skull: Equivalence of Modulation by Post-Impact Pregnancy or Exposure to Physiologically-Patterned Magnetic Fields. ACTA ACUST UNITED AC 2010. [DOI: 10.3923/jbs.2010.84.92] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
|
9
|
Velizarov S, Berg H. An Attempt to alter the ATP Pool inS. CerevzsueCells by 50-HZ Weak Electromagnetic Fields. ACTA ACUST UNITED AC 2009. [DOI: 10.3109/15368379609012877] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
|
10
|
Celestino C, Picazo ML, Toribio M. INFLUENCE OF CHRONIC EXPOSURE TO AN ELECTROMAGNETIC FIELD ON GERMINATION AND EARLY GROWTH OFQUERCUS SUBERSEEDS: PRELIMINARY STUDY. ACTA ACUST UNITED AC 2009. [DOI: 10.1081/jbc-100100302] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
|
11
|
Radeva M, Berg A, Berg H. Induction of Apoptosis and Necrosis in Cancer Cells by Electric Fields, Electromagnetic Fields, and Photodynamically Active Quinoids. Electromagn Biol Med 2009. [DOI: 10.1081/jbc-200044225] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
|
12
|
Zhou A, Liu M, Wang X, Yu H, Zhu M, Pang L, Wang L, Berg H. Effects of ELF Inductively Coupled Weak Magnetic Fields on Proliferation of 6B1 Cells. ACTA ACUST UNITED AC 2009. [DOI: 10.3109/15368379909022589] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
|
13
|
Lee KM, Kim KS, Park CU. Activity and Stability of Alcohol Oxidase from Hansenula sp. by Electrostimulation. JOURNAL OF THE KOREAN CHEMICAL SOCIETY-DAEHAN HWAHAK HOE JEE 2004. [DOI: 10.5012/jkcs.2004.48.2.171] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
|
14
|
Pang L, Baciu C, Traitcheva N, Berg H. Photodynamic effect on cancer cells influenced by electromagnetic fields. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY. B, BIOLOGY 2001; 64:21-6. [PMID: 11705726 DOI: 10.1016/s1011-1344(01)00185-3] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
The synergism of low-frequency electromagnetic field treatment and photodynamic effect on killing of human cancer cells is presented. The weak pulsating electromagnetic field (PEMF) generated by Helmholtz coils in the mT range influences the permeability of cell membranes for photosensitizers. Several types of sensitizers were excited by visible light during incorporation without and with two kinds of PEMF treatment. In the first part suitable photosensitizers were selected in the absorption range between 400 and 700 nm against human myeloid leukaemia K562 and human histiocytic lymphoma U937 cells by treatment of PEMF consisting of rectangular pulse groups. In the second part amplitude and frequency dependencies were measured using sinuous PEMF and white light with the result that after 12 min the PEMF treatment enhanced photodynamic effectivity by more than 40% over the control value. Taking into account the influence of many parameters, an additional optimization will be possible by photodynamic PEMF synergism for an increased drug delivery in general.
Collapse
Affiliation(s)
- L Pang
- Institute of Physics, Nankai University, Nankai, PR China
| | | | | | | |
Collapse
|
15
|
Babincová M, Leszczynska D. INFLUENCE OF ALTERNATING MAGNETIC FIELDS ON TWO-DIMENSIONAL TUMOR GROWTH. ACTA ACUST UNITED AC 2000. [DOI: 10.1081/jbc-100102126] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
|
16
|
Filipic B, Kovács K, Somogyvári F, Ihan A, Ocsovszky I, Koren S, Tóth S. The effects of medium-strength electric impulses on human blood. Bioelectrochemistry 2000; 52:29-36. [PMID: 11059574 DOI: 10.1016/s0302-4598(00)00079-9] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Leukocyte subsets, total leukocyte isolates or full blood samples were subjected to medium-strength square-wave electric impulses (100 V/cm field force, 5 ms duration). On the surface of the leukocytes, the expressions of several markers (CD3, CD4, CD8, CD11a, CD11b and ICAM-1) were determined in order to study the influence of pulsed ionic currents on different aspects of the cellular immune response. Large individual differences were observed among randomly chosen healthy donors, both in the initial expression rate and in the response patterns of different antigens. As a general conclusion, it can be stated that electric impulses with the above parameters activate the state of immune response alertness of human leukocytes. Changes in the activities of several enzymes in the serum in response to electric impulses were also tested in order to examine the feasibility of ex vivo electric treatment of human blood for the establishment of an antiviral and immune activated condition. Slightly elevated lactate dehydrogenase (LDH) levels point to a possibility of enhanced haemolysis, while the lack of an elevation in the membrane-bound peroxidase activity indicates the absence of haemolysis. Significant rises were detected in the serum superoxide dismutase (SOD) activities. Since most ex vivo blood manipulations are characterised by the appearance of superoxide radicals in the serum, a SOD activity enhancement is considered beneficial in these cases. A mild, but significant reduction in the blood clotting time indicates that electric treatment of human blood should be performed with special attention to thrombosis-prone conditions, and adequate precautions and countermeasures should be introduced. Although wider examinations are required before this method can be fully recommended, ex vivo blood treatment with medium-strength electric impulses seems to be a promising adjuvant course for the establishment of acute immune potentiation and an antiviral state in patients undergoing dialysis treatment.
Collapse
Affiliation(s)
- B Filipic
- Institute of Microbiology and Immunology, Medical Faculty, Ljubljana, Slovenia.
| | | | | | | | | | | | | |
Collapse
|
17
|
Binhi VN, Goldman RJ. Ion-protein dissociation predicts 'windows' in electric field-induced wound-cell proliferation. BIOCHIMICA ET BIOPHYSICA ACTA 2000; 1474:147-56. [PMID: 10742593 DOI: 10.1016/s0304-4165(00)00002-7] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
There are many experiments showing that weak, non-thermal electric fields influence living tissues. In many cases, biological effects display 'windows' in biologically effective parameters of electric fields: most dramatic is the fact that relatively intense electric fields sometimes do not cause appreciable effect, while smaller fields do. Linear resonant physical processes do not explain frequency windows in this case. Both frequency and amplitude windows are evident from experiments on human dermal fibroblasts in a collagen matrix. For this in vitro model of skin, exposure to extremely low frequency (ELF) electric fields in the frequency range 10-100 Hz and the amplitude range of 0-130 microA/cm(2) macroscopic current density demonstrates such unusual 'window' behavior. Amplitude window phenomena suggest a non-linear physical mechanism. We consider non-linear quantum-interference effects on protein-bound substrate ions: These ions experience, due to electric fields in the media or biological tissue as small as 1 mV/m, electric gradients produced by polarized binding ligand atomic shells. The electric gradients cause an interference of ion quantum states. This ion-interference mechanism predicts specific electric-field frequency and amplitude windows within which fibroblast proliferation occurs.
Collapse
Affiliation(s)
- V N Binhi
- General Physics Institute RAS, 38 Vavilova St., Moscow, Russia
| | | |
Collapse
|
18
|
Hasty J, Pradines J, Dolnik M, Collins JJ. Noise-based switches and amplifiers for gene expression. Proc Natl Acad Sci U S A 2000; 97:2075-80. [PMID: 10681449 PMCID: PMC15756 DOI: 10.1073/pnas.040411297] [Citation(s) in RCA: 496] [Impact Index Per Article: 20.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The regulation of cellular function is often controlled at the level of gene transcription. Such genetic regulation usually consists of interacting networks, whereby gene products from a single network can act to control their own expression or the production of protein in another network. Engineered control of cellular function through the design and manipulation of such networks lies within the constraints of current technology. Here we develop a model describing the regulation of gene expression and elucidate the effects of noise on the formulation. We consider a single network derived from bacteriophage lambda and construct a two-parameter deterministic model describing the temporal evolution of the concentration of lambda repressor protein. Bistability in the steady-state protein concentration arises naturally, and we show how the bistable regime is enhanced with the addition of the first operator site in the promotor region. We then show how additive and multiplicative external noise can be used to regulate expression. In the additive case, we demonstrate the utility of such control through the construction of a protein switch, whereby protein production is turned "on" and "off" by using short noise pulses. In the multiplicative case, we show that small deviations in the transcription rate can lead to large fluctuations in the production of protein, and we describe how these fluctuations can be used to amplify protein production significantly. These results suggest that an external noise source could be used as a switch and/or amplifier for gene expression. Such a development could have important implications for gene therapy.
Collapse
Affiliation(s)
- J Hasty
- Center for BioDynamics, Department of Biomedical Engineering, Boston University, 44 Cummington Street, Boston, MA 02215, USA.
| | | | | | | |
Collapse
|
19
|
Wang X, Zhou A, Liu M, Yu H, Pang L, Zhu M, Wang L, Berg H. Effects of ELF capacitively coupled weak electric fields on metabolism of 6B1 cells. BIOELECTROCHEMISTRY AND BIOENERGETICS (LAUSANNE, SWITZERLAND) 1999; 48:369-73. [PMID: 10379556 DOI: 10.1016/s0302-4598(99)00024-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
In this study, we adopted several methods of MTT colorimetry, DAPI fluorimetry and ELISA to study the effects of extremely low frequency (ELF) capacitively coupled electric fields (EFs) on the metabolism of 6B1 cells. The result shows that 50 mV cm(-1) ELF EF (10-100 Hz) has no significant effect on proliferation, DNA synthesis and activity of succinate dehydrogenase of 6B1 cells, indicating that the effect of ELF (10-100 Hz) EF on the metabolism of 6B1 cells is not obvious. However, 50 mV cm(-1), 50 Hz EF significantly promotes the HBs-Ab (Hepatitis B surface antibody) secretion of 6B1 cells, implying that under this situation, EF has some distinctive effect on the outerface of 6B1 cell membrane.
Collapse
Affiliation(s)
- X Wang
- Department of Biophysical Science and Technology, Nankai University, Tianjin, China
| | | | | | | | | | | | | | | |
Collapse
|
20
|
Berg H. Problems of weak electromagnetic field effects in cell biology. BIOELECTROCHEMISTRY AND BIOENERGETICS (LAUSANNE, SWITZERLAND) 1999; 48:355-60. [PMID: 10379554 DOI: 10.1016/s0302-4598(99)00012-4] [Citation(s) in RCA: 81] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Electrostimulations of cells by weak electric or electromagnetic LF and HF-fields are applied widely today; capacitively or inductively coupled, however, they are seldom applied for cell-free and membrane-free solutions of enzymes. First, the detection of a response of the cells ('electrical window') is a prerequisite for testing at least three parameters: frequency, amplitude and treatment time, besides reproducible biological conditions. The 'state-of-the-art' of this fast developing direction of bioelectrochemistry can be characterized in the following way: the results from several laboratories of (a) cell proliferation, (b) ion transport, (c) activation of several enzymes (Na,K-ATPase), (d) increase of certain protein concentrations (heat-shock protein hsp70) are more or less in agreement. Unfortunately, there are discrepancies between no less than 7 labs in the gene expression of c-myc, c-fos histone 2B, -actin, URA-3 and others, especially for low fields (< 0.05 mT), e.g., in HL60 cells! The reason why seems to be: (1) differences in the most suitable isolation procedure, (2) interferences in the case of too low magnetic flux and (3) too small ranges of parameters have been measured. Today, three open problems must be pointed out: (A) What is the physiological causality for specific 'electrical windows' and their positive or negative efficacy? (B) What are the biochemical targets for either magnetic or electric fields or both? (C) What is the influence of electrical and (or) thermal noise on field efficiency?
Collapse
Affiliation(s)
- H Berg
- Laboratory Bioelectrochemistry, Jena, Germany.
| |
Collapse
|
21
|
Lei C, Berg H. Electromagnetic window effects on proliferation rate of Corynebacterium glutamicum. ACTA ACUST UNITED AC 1998. [DOI: 10.1016/s0302-4598(98)00099-3] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
|
22
|
Hönes I, Pospischil A, Berg H. Electrostimulation of proliferation of the denitrifying bacterium Pseudomonas stutzeri. ACTA ACUST UNITED AC 1998. [DOI: 10.1016/s0302-4598(97)00094-9] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|
23
|
Proliferation response of yeast saccharomyces cerevisiae on electromagnetic field parameters. ACTA ACUST UNITED AC 1997. [DOI: 10.1016/s0302-4598(96)05184-7] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|
24
|
Kaiser F. External signals and internal oscillation dynamics: biophysical aspects and modelling approaches for interactions of weak electromagnetic fields at the cellular level. ACTA ACUST UNITED AC 1996. [DOI: 10.1016/0302-4598(96)05085-4] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|
25
|
|
26
|
Effects of extremely low-frequency electromagnetic fields on bacteria—the question of a co-stressing factor. ACTA ACUST UNITED AC 1996. [DOI: 10.1016/0302-4598(95)00504-8] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
|