ISSN:0197-8462    

DOI:10.1002/bem.2250130102

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1992

数据来源: WILEY

ISSN:0197-8462    

DOI:10.1002/bem.2250130103

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1992

数据来源: WILEY

ISSN:0197-8462    

DOI:10.1002/bem.2250130104

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1992

数据来源: WILEY

摘要:

AbstractObservations recently reported by others indicate that a combination of a weak dc magnetic field and extremely‐low‐frequency ac magnetic field can produce resonant effects in biological systems. We report measurements of the effects of combined dc and ac magnetic fields on the dc current through channel‐free planar phospholipid membranes. The combined dc‐ac magnetic fields did affect the dc current through planar phospholipid membranes, but not in every membrane, and not consistently at the same values of magnetic flux density and frequency. None of our measurements showed resonant response akin to the cyclotron‐like resonance reported in diatoms [Smith et al., 1987] and lymphocytes [Liboff et a

ISSN:0197-8462    

DOI:10.1002/bem.2250130105

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1992

数据来源: WILEY

摘要:

AbstractSixty‐Hz magnetic field exposures were measured for 45 adult residents of Maine. Thirty of the subjects resided near rights‐of‐way (ROWs) with either 345‐ and 115‐kV transmission lines, or ROWs with only 115‐kV transmission lines; fifteen resided far from any transmission lines. Personal exposure data for a single 24‐hour period was acquired with the EMDEX. The EMDEX's event‐marker button was used to partition exposures into Home and Away components. Also, three area measurements were taken for each subject during the personal exposure measurement period: 1) 24‐hr fixed‐site bedroom measurement with a second EMDEX; 2) Spot measurements in at least three rooms of every residence; and 3) Spot measurements outside each residence. Residence near transmission lines highly loaded during the measurement period was associated with increased Home and Total exposure relative to a far‐away population. Average exposure level while away from home was uniform (at about 2 mG) throughout the study population. On a quantitative level, Home exposure was correlated equivalently with Spot‐In (r = .70) and the 24‐hr fixed site measurement (r = .68). Correlations of area measurements with Total exposure were weaker because of the dilution effect of Away exposure (r = .64 for Spot‐In; r = .61 for 24‐h Bedroom). Away and Home exposures were not correlated (r = .14), which reinforced our confidence that the participants used the EMDEX correctly. The data suggest the need for caution before inferences are drawn about total personal exposure from area measurements. The study demonstrates the feasibility of obtaining valid measures of magnetic‐field exposure with the personal exposure mo

ISSN:0197-8462    

DOI:10.1002/bem.2250130106

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1992

数据来源: WILEY

摘要:

AbstractWe studied the effects of single (45 min) and repeated (ten daily 45‐min sessions) microwave exposures (2450‐MHz, 1 mW/cm2, average whole‐body SAR of 0.6 W/kg. pulsed at 500 pps with pulse width of 2 μs) on the concentration and affinity of benzodiazepine receptors in the cerebral cortex, hippocampus, and cerebellum of the rat. We used a receptor‐binding assay with3H‐flunitrazepam as ligand. Immediately after a single exposure, an increase in the concentration of receptor was observed in the cerebral cortex, but no significant effect was observed in the hippocampus or cerebellum. No significant change in binding affinity of the receptors was observed in any of the brain‐regions studied. In rats subjected to repeated exposures, no significant change in receptor concentration was found in the cerebral cortex immediately after the last exposure, which may indicate an adaptation to repeated exposures. Our data also show that handling and exposure procedures in our experiments did not significantly affect benzodiazepine receptors in the brain. Because benzodiazepine receptors in the brain are responsive to anxiety and stress, our data support the hypothesis that low‐intensity microwave irradiation can be a so

ISSN:0197-8462    

DOI:10.1002/bem.2250130107

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1992

数据来源: WILEY

摘要:

AbstractTo determine whether a 50‐Hz magnetic field will induce mutations, a sex‐linked recessive lethal test ofDrosophila melanogasterwas performed. Adult flies were exposed at an rms flux density of 500 μT or 5 mT to the homogeneous field of a Helmholtz coil. The ambient field to which controls were exposed was less than 1 μT. Exposures took place continuously for 13 to 14 days, which correspond to the life cycle ofDrosophilaat 25°C About 10,000 X‐chromosomes were tested at each flux density. Recessive lethal mutation rates of 0.13, 0.21, and 0.18 percent were observed, respectively, for control, 500‐μT, and 5‐mT conditions. By the Kastenbaum‐Bowman significance test, the recessive lethal mutation rates in the 500‐μT and 5‐mT conditions did not differ from the mutat

ISSN:0197-8462    

DOI:10.1002/bem.2250130108

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1992

数据来源: WILEY

摘要:

AbstractThe effects of low‐level microwave radiation on gene expression inEscherichia colihave been examined in a sensitive model. We confirm the previously reported existence of an increase in β‐galactosidase expression by microwave radiation—an increase not duplicated by bulk heating. However, the effect was not frequency dependent and appeared to be due to heating effects peculiar to microwaves. These results indicate that small thermal gradients may be a source of biological effects of non‐ionizing r

ISSN:0197-8462    

DOI:10.1002/bem.2250130109

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1992

数据来源: WILEY

ISSN:0197-8462    

DOI:10.1002/bem.2250130101

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1992

数据来源: WILEY