Study type: in_vitro

Cell Calcium · 1987 · Manual

One-hour exposure to combined steady and periodic magnetic fields (up to 30 Hz; up to 1.5 × 10^(-4) T_rms) was used to probe cyclotron resonance effects on 45Ca incorporation in mixed human lymphocytes. Relative 45Ca uptake at resonance appeared to follow different interaction mechanisms above vs below 0.2 × 10^(-4) T_rms. Nifedipine decreased 45Ca uptake in both unexposed and exposed suspensions, and evidence suggested nifedipine antagonized the 45Ca cyclotron resonance tuning signal.

DOI: 10.1016/0143-4160(87)90025-x · PMID: 3435912

Study URL: https://pubmed.ncbi.nlm.nih.gov/3435912/

Study type: other

Bioelectromagnetics · 1987 · Manual

Experiments in diatoms showed an apparent movement of calcium across the cell membrane in response to specific DC and AC magnetic flux densities and a frequency derived from cyclotron resonance theory. A clear resonance with a sharp frequency response curve was reported, along with a dose response as AC flux density varied and effects at odd harmonics of the basic cyclotron frequency.

DOI: 10.1002/bem.2250080302 · PMID: 3663247

Study URL: https://pubmed.ncbi.nlm.nih.gov/3663247/

Study type: animal

Radiation research · 1987 · PubMed

Rats exposed to 700 MHz microwave radiation at 15 mW/cm2 with a 2.5°C rise in body temperature showed significant receptor binding changes only in the hypothalamus among six brain regions examined. Hypothalamic [3H]clonidine binding (adrenergic receptors) decreased by 36% following radiation, while hypothalamic [3H]quinuclidinyl benzilate binding (muscarinic receptors) increased by 65% at the onset of radiation and remained elevated during cooling after exposure ended.

PMID: 3027740

Study URL: https://pubmed.ncbi.nlm.nih.gov/3027740/

Study type: in_vitro

Bioelectromagnetics · 1987 · PubMed

In vitro assays of human red blood cell membranes exposed to 2,450-MHz continuous-wave microwave radiation (6 W/kg) at five temperatures (23–27°C) showed an activity change only for Na+/K+ ATPase at 25°C. At 25°C, Na+/K+ ATPase activity decreased by approximately 35% versus sham-irradiated samples; total ATPase and Ca2+ ATPase did not show reported exposure-related changes.

DOI: 10.1002/bem.2250080211 · PMID: 3040008

Study URL: https://pubmed.ncbi.nlm.nih.gov/3040008/

Study type: animal

Journal of applied physiology (Bethesda, Md. : 1985) · 1987 · PubMed

Pulse-modulated microwave radiation (1.3 GHz) at 7.7 mW/g for 90 min produced a modest decline in daily sperm production, primarily affecting primary spermatocytes; 4.2 mW/g was ineffective. Conventional heating required intratesticular temperatures >39°C for 60 min to significantly reduce DSP, and FSH/LH levels were resistant to either treatment; authors conclude effects are explained by macroscopic heating.

DOI: 10.1152/jappl.1987.62.1.245 · PMID: 3104288

Study URL: https://pubmed.ncbi.nlm.nih.gov/3104288/

Study type: animal

Folia biologica · 1987 · PubMed

Microwave irradiation altered the number of spleen plaque-forming cells (PFC) measured on days 4 and 5 after immunization, with effects depending on absorbed dose/exposure duration. Exposures of 1, 3, and 5 min (SA 4, 12, and 20.1 kJ/kg) increased PFC formation, while 7 and 9 min exposures did not change PFC. A 5-min exposure increased rectal temperature by 2.5°C, but inducing a similar thermal effect via elevated environmental temperature did not increase PFC.

PMID: 3305096

Study URL: https://pubmed.ncbi.nlm.nih.gov/3305096/

Study type: animal

Bioelectromagnetics · 1987 · PubMed

In anesthetized rats irradiated for 10 or 16 minutes at 360, 700, or 2,450 MHz and whole-body-averaged SARs of 2, 6, or 10 W/kg, localized post-irradiation temperatures at previously identified high-SAR regions were appreciably higher than at lower-SAR body sites. Rectum and tail temperatures were significantly higher after 360 MHz exposure, and tail temperature was higher after 2,450 MHz exposure, compared with 700 MHz; brain temperature did not differ from the rest of the body following exposure.

DOI: 10.1002/bem.2250080407 · PMID: 3426636

Study URL: https://pubmed.ncbi.nlm.nih.gov/3426636/

Study type: exposure_assessment

Health physics · 1987 · PubMed

Rat cadavers (approximately 5–320 g; 5–22 cm) oriented perpendicular to the electric field were exposed to 2.45-GHz microwave radiation and SAR was measured calorimetrically (whole-body) and via time-temperature profiles (local). Whole-body SAR generally decreased with increasing weight/size (e.g., from 0.58 to 0.38 mW g-1 per mW cm-2 between 40 g and 320 g; and from 0.81 to 0.34 between 5 g and 30 g). Compared with previously reported data for parallel-to-E-field orientation, whole-body SARs were larger for animals >40 g when oriented perpendicular to the E-field, while local SARs in colon and brain were slightly higher for the parallel orientation in animals >40 g; for animals <40 g, whole-body and local SARs were significantly higher for the parallel orientation.

DOI: 10.1097/00004032-198701000-00003 · PMID: 3804742

Study URL: https://pubmed.ncbi.nlm.nih.gov/3804742/

Study type: engineering

Optics letters · 1987 · PubMed

Pulsed microwave radiation tunable from 10 to 30 GHz was generated via parametric interaction of two near-infrared pulses in GaP crystals at low temperatures. The microwave pulses had duration of 30 nsec and power on the order of 1 mW.

DOI: 10.1364/ol.12.000184 · PMID: 19738833

Study URL: https://pubmed.ncbi.nlm.nih.gov/19738833/

Study type: in_vitro

Radiation research · 1987 · PubMed

In MRC-5 human fibroblasts, continuous-wave and pulsed-wave microwave-range RFR exposures (350, 850, and 1200 MHz) for 1–3 h at 37°C showed no effect on the rate of UV-induced DNA repair synthesis. Pulsed-wave exposures at 350 and 850 MHz with medium held at 39°C during the post-UV repair period also showed no effect. RFR exposure alone did not induce repair synthesis under the tested conditions, and preliminary experiments found no effect on semiconservative DNA synthesis ([3H]thymidine incorporation) at 39°C.

PMID: 3575655

Study URL: https://pubmed.ncbi.nlm.nih.gov/3575655/

Study type: animal

The Journal of trauma · 1987 · PubMed

Piglets exposed to radiation from a standard household microwave oven for varying durations developed full-thickness skin and visceral burns. Microscopy showed a pattern of relative layered tissue sparing, with burned skin and muscle and relatively unburned subcutaneous fat between these layers.

DOI: 10.1097/00005373-198708000-00014 · PMID: 3612872

Study URL: https://pubmed.ncbi.nlm.nih.gov/3612872/

Study type: engineering

Applied optics · 1987 · PubMed

A calculation method for the electric field scattered from a helical dielectric target was compared with an equivalent experiment at a 3.18 cm incident wavelength, and experimental intensities were compared to first-order theory.

DOI: 10.1364/ao.26.004632 · PMID: 20523417

Study URL: https://pubmed.ncbi.nlm.nih.gov/20523417/

Study type: review

Clinical physics and physiological measurement : an official journal of the Hospital Physicists' Association, Deutsche Gesellschaft fur Medizinische Physik and the European Federation of Organisations for Medical Physics · 1987 · PubMed

Reviews dielectric properties (relative permittivity and electrical conductivity) of mammalian tissues and biological fluids across 1 Hz to 10 GHz, presenting typical data for materials and discussing influences such as water content, necrosis, and temperature. Differences between normal and cancerous tissue dielectric characteristics are discussed, with relevance noted for diagnostic/therapeutic radiofrequency and microwave applications and for understanding potential hazards.

DOI: 10.1088/0143-0815/8/4a/002 · PMID: 3568571

Study URL: https://pubmed.ncbi.nlm.nih.gov/3568571/

Study type: animal

Bioelectromagnetics · 1987 · PubMed

Rats exposed for 8 h to continuous-wave 1.3 GHz microwave radiation at a mean specific absorbed dose rate of 9 mW/g showed an elevation of deep rectal temperature of 4.5°C. Despite this acute thermogenesis, the authors report no substantial decrement in measured testicular function outcomes (organ masses, sperm production/counts, FSH, LH) at 6.5, 13, 26, or 52 days post-exposure.

DOI: 10.1002/bem.2250080106 · PMID: 3579998

Study URL: https://pubmed.ncbi.nlm.nih.gov/3579998/

Study type: animal

Bioelectromagnetics · 1987 · PubMed

Quail embryos irradiated continuously in ovo with 2.45 GHz continuous wave radiation for the first 12 days of embryogenesis showed no differences versus sham in hatchability, post-hatching mortality, egg production, egg weight, fertility, hatchability of eggs produced, or reproductive performance of progeny.

DOI: 10.1002/bem.2250080103 · PMID: 3580002

Study URL: https://pubmed.ncbi.nlm.nih.gov/3580002/

Study type: animal

Bioelectromagnetics · 1987 · PubMed

Rats chronically exposed to continuous-wave 2,450-MHz microwaves (0.5 mW/cm2; SAR 0.14 W/kg) differed reliably from sham-exposed rats on only one behavioral measure (a lever-pressing operant task). The authors conclude exposure was below the threshold for behavioral effects across many variables, but did affect a time-related operant task with an unpredictable direction.

DOI: 10.1002/bem.2250080205 · PMID: 3619949

Study URL: https://pubmed.ncbi.nlm.nih.gov/3619949/

Study type: animal

Bioelectromagnetics · 1987 · PubMed

Rats were repeatedly exposed to 2,450-MHz continuous-wave microwaves (5 mW/cm2) or sham conditions at ambient temperatures representing different cold stress levels (20°C or 30°C). Microwave exposure had no effect on mean growth rates at either exposure temperature. Differences in colonic temperature at colder test ambient temperatures suggested that any alteration of thermoregulatory responses depended on the magnitude of cold stress during exposure.

DOI: 10.1002/bem.2250080307 · PMID: 3663250

Study URL: https://pubmed.ncbi.nlm.nih.gov/3663250/

Study type: animal

Bioelectromagnetics · 1987 · PubMed

Across ambient temperatures below 34°C, microwave-exposed mice had significantly greater survival than concurrently sham-exposed mice (approximately 20% higher). At ambient temperatures at or above 37°C, deaths from hyperthermia occurred, and the abstract states microwave exposure may be detrimental when combined with high ambient temperatures.

DOI: 10.1002/bem.2250080308 · PMID: 3663251

Study URL: https://pubmed.ncbi.nlm.nih.gov/3663251/

Study type: animal

Radiobiologiia · 1987 · PubMed

In rats, a single exposure to continuous-wave 2450 MHz microwave radiation at power densities of 0.1, 1.0, 10, and 35 mW/cm2 was associated with changes in EEG parameters (spontaneous electrical activity of the cerebral cortex).

PMID: 3823385

Study URL: https://pubmed.ncbi.nlm.nih.gov/3823385/

Study type: in_vitro

Radiation research · 1987 · PubMed

Purified plasmid DNA exposed to nonthermal microwave radiation (2.00–8.75 GHz) showed single- and double-strand breaks detected by agarose gel electrophoresis. DNA damage depended on the presence of small amounts of copper and varied with microwave power and exposure duration; cuprous (not cupric) ions mimicked the microwave effects.

PMID: 3575652

Study URL: https://pubmed.ncbi.nlm.nih.gov/3575652/

Study type: animal

Radiobiologiia · 1987 · PubMed

Structural and functional changes in the central nervous system were reported to be similar for microwave and ionizing (gamma) radiation despite different mechanisms. With combined exposure, the sequence mattered: microwave before gamma showed antagonism, while microwaves after gamma showed synergism.

PMID: 3615818

Study URL: https://pubmed.ncbi.nlm.nih.gov/3615818/

Study type: animal

Perceptual and motor skills · 1987 · PubMed

Behavioral (thermal responding) rates depended on an interaction between fixed-ratio schedule value and microwave intensity. FR-1 produced the lowest overall rates, while FR-15 and FR-25 produced the highest. Higher responding occurred at 62.5 W than at higher intensities for FR-1, FR-15, and FR-25; FR-10 and FR-30 produced intermediate rates that were constant across intensities.

DOI: 10.2466/pms.1987.65.3.787 · PMID: 3438124

Study URL: https://pubmed.ncbi.nlm.nih.gov/3438124/

Zhonghua yu fang yi xue za zhi [Chinese journal of preventive medicine] · 1987 · PubMed

PMID: 3652869

Study URL: https://pubmed.ncbi.nlm.nih.gov/3652869/