О влиянии длительного воздействия постоянного и знакопеременного магнитного поля 1000 э на митотическую активность
А. Д. Стржижковский, Г. В. Галактионова · 1976
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Showing 1,633 studies in Cellular Effects
А. Д. Стржижковский, Г. В. Галактионова · 1976
Richard Bentall · 1976
U. Zimmermann, G. Pilwat, F. Beckers, F. Riemann · 1976
R. SUNDERMAN, T. Z. FAHIDY · 1976
Claire A. Van Ummersen, Frances C. Cogan · 1976
Albert, E.N., DeSantis, M. · 1976
Adult Chinese hamsters were exposed to 2450 MHz microwaves at 10 and 25 mw/cm² for 14 hours per day over 20 days. At 10 mw/cm² some experimental animals had fewer dendritic spines, axonal swelling, axonal beading, hyperchromatic neurons, and cytoplasmic swelling of neurons, with no gliosis, hemorrhage, or pyknosis. The investigators considered the observed morphological changes probably reversible, although no recovery studies were performed. At 25 mw/cm² similar histological alterations occurred, with some evidence of quantitatively greater effects, and animals were more irritable during the first 7-14 days but appeared to become acclimatized.
Richard H. Lovely, Thomas J. Sparks, A.W. Guy · 1976
Colin A. Vincent · 1976
Unknown authors · 1976
Researchers used whole brain homogenate from unsexed adult Sprague-Dawley rats. For atropine, the bound-to-free ratio fell from near 2 in controls to near 1 in irradiated samples. For acetylcholine, irradiated samples showed a tendency toward lower ratios, but insufficient data prevented a significance test.
A. S. Presman · 1975
Yu. G. Shaposhnikov, I. F. Yares'ko, Yu. V. Vernigora · 1975
C. Romero-Sierra et al. · 1975
Lancranian I, Maicanescu M, Rafaila E, Klepsch I, Popescu HI · 1975
Lebovitz RM · 1975
J. D. CLEMENT-METRAL · 1975
J.J. Weiter, E.D. Finch, W. Schultz, V. Frattali · 1975
N.A.G. AHMED, J.H. CALDERWOOD, H. FRÖHLICH, C.W. SMITH · 1975
The team measured the magnetic susceptibility of lysozyme solutions while varying the applied magnetic field. At 600 gauss, a 0.011% weight solution showed an increment in diamagnetic susceptibility of order 1.5 × 10^-10, which per molecule was 10^4 times larger than expected for ordinary diamagnetic material. The increase in susceptibility disappeared above a critical field of about 800 gauss. A 0.1% solution showed only slightly higher susceptibility than the 0.011% solution, and humid enzyme powder showed maximum effect at about 50% water content.
Hans G. L. Coster, Ulrich Zimmermann · 1975
Researchers increased the membrane potential of Valonia utricularis cells rapidly by applying ~500 ws current pulses. Dielectric breakdown occurred when the membrane potential reached ~0.85 V, shown by a discontinuous increase in current. The breakdown was reversible and could be repeated after a resealing time of approximately 10 seconds. When pulses were repeated with less than 10 seconds between them, the cells deteriorated rapidly and breakdown could no longer be detected. The rapidity of the breakdown ruled out a punch-through mechanism, while heating was ruled out by a separate argument.
John W. Allis, Claude M. Weil, David E. Jones, Jr. · 1975
A waveguide applicator is mounted vertically in a Cary 15 spectrophotometer so the sample sits in both the light path and the microwave slot. Temperature of the irradiated and reference samples is monitored continuously and can be matched within a few tenths of a degree from 15 to 40 °C. Theoretical analysis showed about 16% of incident microwave power is absorbed by the sample, and measured temperature profiles confirmed relatively uniform heating in the upper half of the cuvette. Spectrophotometric tests found no artifacts from the microwave hardware and stray light remained below 0.01% up to an absorbance of 3.0.
B. C. GOODWIN, SILVIA VIERU · 1975
Fa'itel'berh-Blank VR, Orlova AV · 1975
L. E. DAVIS, SUSAN SHURIN, R. T. JOHNSON · 1975
Researchers cultured embryonic chick tibiae in vitro and exposed them to either a static or a pulsed electric field. Histological examination and macroscopic photographs showed no differences in growth patterns between test and control bones.
Watson et al. · 1975
Watson et al. found that the growth rate of embryonic chick tibiae in vitro was enhanced by a pulsed electric field of 1,000 V cm but not by a static field. The authors suggest that the lack of enhancement in a static field is due to the ability of the cultures to sustain a field. They explain that during the 9-day growth period in a steady field there is no field within the bone, no charge movement, and thus no bioelectric command signal except at the instants when the field is switched on or off. They derive a relaxation time constant of about 10 seconds for the tissue, indicating that in a steady field there is no transducer mechanism available.
A. W. Friend, E. D. Finch, H. P. Schwan · 1975
P. E. Hamrick, J. G. Zinkl · 1975
Researchers exposed rabbit erythrocytes to 2450 and 3000 MHz microwave radiation at multiple intensities to test for changes in potassium efflux and osmotic resistance. No significant differences were found between exposed and control cells in potassium efflux, osmotic resistance, or hemoglobin efflux.