KENNETH R. FOSTER et al. · 1979
Between 0-01 and ~1 GHz the permittivity decreased and conductivity increased as a power law of frequency. Above 1 GHz the conductivity increased quadratically with frequency due to dipolar reorientation of free water molecules, with an apparent rotational relaxation frequency of 21-24 GHz at 37 °C. The authors provided empirical equations for the dielectric properties of average brain tissue at 37 °C for theoretical microwave absorption studies.
James P. Dilger et al. · 1979
Henry S. Ho, William P. Edwards, Howard Bassen · 1979
Researchers measured internal electric field distributions in phantom human heads exposed to leakage radiation from 2450 MHz and 915 MHz microwave ovens. The phantom heads were made from actual adult and child skulls filled with dielectric materials matching the electrical properties of muscle or brain. For 5 mW/cm² leakage at 2450 MHz, the maximum equivalent dose rate was 9.6 W/kg in the adult phantom and 14.6 W/kg in the child phantom. For 5 mW/cm² leakage at 915 MHz, the maximum equivalent dose rate was 3.0 W/kg in the adult phantom and 5.3 W/kg in the child phantom.
William Regelson et al. · 1979
Carl H. Sutton, Frederick B. Carroll · 1979
Researchers used Sprague-Dawley male rats to study the tolerance of the blood-brain barrier to microwave irradiation at 2450 MHz. Horseradish peroxidase was administered 30 minutes before sacrifice to assess barrier disruption, and brains were analyzed after perfusion. In normothermic rats, the barrier was disrupted after 10 minutes at 45°C, 15 minutes at 42°C, and 60 minutes at 40°C; in hypothermic rats, disruption occurred after longer durations at the same temperatures.
Allan H. Frey, Elaine Coren · 1979
Charles L. Sheridan et al. · 1979
The longevity study of mice exposed in utero to near-lethal 2450-MHz microwave radiation is in its third year with mortality rising in both groups. Spontaneous tumors appeared in two control mice (n=81) but not in radiated mice (n=83), a difference too narrow to exclude chance. Acute studies in anesthetized rats, guinea pigs, and rabbits showed that brief near-lethal 2450-MHz exposures produced whole-body temperature rises of 4.5 to 12 K and altered thermal distributions, with the brain stem appearing thermally privileged. Twelve pilot studies were completed to optimize microwave hyperthermia as adjuvant treatment for experimentally induced glioblastoma in rats.
John R. Thomas, Linda S. Burch · 1979
Four male Long-Evans rats were trained on a fixed-interval schedule requiring a lever press for food pellets. The rats were exposed to 2.45 GHz pulsed microwave radiation at an average power density of 1 mW/cm² for 30 minutes before behavioral sessions. Chlordiazepoxide alone increased response rates up to a maximum, but combined with microwave radiation the drug's effects were potentiated. Behavior returned to baseline after each session.
Don R. Justesen · 1979
S.M. Bawin, I. Sabbot, B. Bystrom, P.M. Sagan, W.R. Adey · 1979
Researchers exposed groups of 30 male albino rats to vertical 60 Hz electric fields at 0, 50, 500, and 1000 V/m for 30 days. Throughout the 44-day experiment they measured body weight, water and food consumption, urine output, and general activity.
Unknown authors · 1979
Laboratory studies have shown that electromagnetic fields similar to those from high-voltage transmission lines can produce biological effects. Correlation has been established between the presence of transmission-line fields and the occurrence of suicides in part of the Midlands of England.
Jean-Louis Schwartz · 1978
Researchers studied the circumesophageal connective of the lobster to investigate the influence of a constant magnetic field on nerve impulse conduction velocity. They found no significant effect of a 1.2 T magnetic field on conduction velocity in either parallel or perpendicular configurations.
Ohno, K., Pettigrew, K.D., Rapoport, S.I. · 1978
They measured cerebrovascular permeability-area products for 14C-sucrose in 5 brain regions. Mean PA values were similar across sham, 1 mW /cm², and 10 mW/cm² groups. The authors concluded that an effect of microwave treatment on barrier permeability cannot be concluded.
S. M. Bawin, A. Sheppard, W. R. Adey · 1978
Chung-Kwang Chou, Arthur W. Guy · 1978
Albert, E.N. · 1978
Researchers exposed adult Wistar rats and Chinese hamsters to continuous-wave microwave irradiation at 2450 and 2800 MHz at 10 mW/cm² for 2 hours. Horseradish peroxidase was injected intravenously to identify brain areas with increased blood-brain barrier permeability. Electron microscopy revealed endothelial cells flooded with peroxidase, swollen astrocytic end feet, myelin figures in dendrites, membranous proliferation in dendrites, and platelet microthrombi in capillaries. Light microscopy showed edematous neuropil surrounding leaky vessels.
Q. BALZANO, O. GARAY, F.R. STEEL · 1978
ROBERT C. BECK · 1978
S. M. Bawin, W. R. Adey, I. M. Sabbot · 1978
Harry D. Muller · 1978
The study describes recent development of rodent control devices that reputedly work by electromagnetic charging of the ground or structures. Rodent damage was estimated at $25 per rat and $4 per mouse, and chemical control poses residue risks in meat, eggs, or manure. Devices initially evoked increased burrowing followed by atypical behavior including distorted diet patterns, burrow avoidance, lethargy, reduced reproduction, anorexia, and hypo-activity resulting in death.
Unknown authors · 1978
Evoked potentials measured inside and outside the magnet were essentially the same, and the latency of fast and slow waves from limb to brain was not changed by the magnetic field. Heart rate was lower inside the magnet, while blood pressure results showed opposite directions in the two monkeys. Noticeable changes in blood hematology and chemistry can be attributed to the trauma caused by the implantation of the cortical electrodes. From the tests which were performed, as described above, we conclude that there were no observable effects in the two monkeys.
Unknown authors · 1978
The paper reviews existing studies of people living or working near cellular infrastructure for long-term, low-level radiofrequency radiation exposures. Anecdotal reports and some epidemiology studies found headaches, skin rashes, sleep disturbances, depression, decreased libido, increased rates of suicide, concentration problems, dizziness, memory changes, increased risk of cancer, tremors, and other neurophysiological effects in populations near base stations. Epidemiological research in this area is sparse and contradictory, and exposures are difficult to quantify given increasing background RFR from consumer products. Some research warrants caution in infrastructure siting and further epidemiology research on total ambient RFR exposures is warranted.
Lin JC · 1977
Christopher H. Dodge, Zorach R. Glaser · 1977
Lövsund, P., Öberg, P.A., Nilsson, S.E.G. · 1977
Researchers recorded extracellular electrical activity from frog retinal ganglion cells during and after exposure to ELF magnetic fields. The preparations were exposed to magnetic flux densities of 0-80 mT at frequencies of 10-50 Hz. Ganglion cell responses varied with flux density and frequency, and cells responded only to ON-OFF changes in the field.
