Raymond L. H. Murphy et al. · 1973
Fifty subjects, including twenty-seven patients with known heart murmurs and the remainder normal volunteers, were examined both directly and via a microwave telestethoscope by an observer 2.7 miles away who was blinded to their status. All murmurs of grade 2/6 or louder were accurately described, while two of the 32 grade 1/6 murmurs were not heard. Overall findings matched in 98 percent of cases, with 19 of 24 systolic murmurs graded identically and five differing by one grade.
Mikolajczyk, H. · 1973
T. Daryl Hawkins et al. · 1973
In the lethality study, one hundred and seventy-four male Wistar rats were exposed to 3000 MHz microwave radiation, and the lethal energy density (LD50) increased with longer exposure durations. The lethal power density required for a lethal effect decreased as exposure duration increased. At each frequency, higher power levels resulted in shorter times to work stoppage. At all power levels which resulted in a complete cessation of performance, 1700 MHz produced the shortest stoppage times, while both higher and lower frequencies had progressively less influence.
G. V. Galaktionova, A. D. Strzhizhovskiy · 1973
Colonel Budd Appleton · 1973
Bernard Greenberg · 1973
Wendy Gordon · 1973
Bernard Greenberg · 1973
Arthur W. Guy et al. · 1973
Researchers used a spherical mathematical model to simulate heat transfer and thermoregulation in a nude man resting at 28° C. and 50% RH, exposed to 100 watts of deposited power corresponding to 590 mw./cm.2 at 20 MHz. The study also calculated that incident power densities of 3540 and 900 mw./cm. at 20 MHz would produce a heat stress index of 100 for a man at rest and at work, respectively, in an environment of 25°C., 50% RH, and 15 mb.
R. B. Stone et al. · 1973
Glow-discharge treatments at 60 Hz, 15 kHz, and 17.5 kHz for 3 minutes in an evacuated tube raised germination from below 10% to 60–90% in laboratory tests. RF treatments at 1.3–3.1 kV/cm also significantly increased germination, but generally not as much as glow-discharge. In a field test with saw-ginned seed, RF treatment raised emergence from 50% to 76%, while glow-discharge did not significantly increase emergence.
Nicholas P. D. Smyth et al. · 1973
Fifty-two patients with triggered ventricular, atrial, A-V synchronous, and A-V sequential pacemakers were exposed to magnetic fields generated by fixed and portable weapons detectors ranging from 100 Hz to 450 kHz at 0.5 to 1.35 gauss. No standard ventricular pacemaker, unipolar or bipolar, was affected by any of the weapons detectors. Of the eight patients with sensitive atrial pacemakers, one showed a single-beat rate increase that was not reproducible on repeat testing. In the two sensitive A-V groups, a brief rate change occurred in all three patients in each group, and any changes resolved immediately after leaving the magnetic field. No pacemaker stopped functioning, post-test ECGs showed no persistent rate changes, and no patient reported symptoms during exposure.
Guy AW, Taylor EM, Ashleman B, Lin JC · 1973
E.A. Kolesnik, N.A. Komogortseva · 1973
William H. Walter et al. · 1973
Andrew K. Chan et al. · 1973
FINCH, E.D., McLEES, B.D. · 1973
B. Stefanov, I. Zlatarov, A. Solakov · 1973
Zoran Đorđević · 1973
R.G. Olson, C.H. Durney, J.L. Lords, C.C. Johnson · 1973
Researchers used isolated rat hearts back-perfused with oxygenated Ringer's solution and exposed them to microwave radiation in a stripline configuration inside a Faraday shield. Hearts were stabilized for 30 minutes then irradiated for 30 minutes at an absorbed power of 1.5 to 2.5 mW/cm³, which was determined using a liquid crystal optical fiber temperature probe. Exposure caused pronounced bradycardia, with heart rates decreasing 15 to 40 percent below baseline or temporary cessations of 5 to 12 seconds, and the effect reversed within 2 to 8 minutes during continued irradiation.
J. W. Rockway, P. M. Hansen · 1973
N. Bloembergen, J. A. Pierce, R. W. P. King · 1973
George F. D'Cunha et al. · 1973
James C. Lin, Arthur W. Guy, Curtis C. Johnson · 1973
W.M. Houk, S.M. Michaelson, A. Longacre Jr. · 1973
Researchers measured colonic temperature in 400 unrestrained young male Long-Evans rats exposed to 2450 MHz continuous-wave microwave radiation under constant environmental conditions. The study tested power levels of 9, 18, and 36 mW/cm². At 9 mW/cm² the temperature rise was distinct, maintained throughout the 150-minute exposure, and returned to pre-exposure levels within 30 minutes after exposure, and the rats did not awaken. At 18 mW/cm² the rise was about twice that at 9 mW/cm², similarly sustained, and returned to normal within 30 minutes, with most rats awakening by one hour but resuming rest.
Zoran Djordjevic, Aleksandar Kolak · 1973
