Browse 6,486 peer-reviewed studies on electromagnetic field health effects from 4 research libraries.
Showing 72 studies (Insects & Invertebrates)
Unknown authors · 1983
Researchers tested a repetitive single pulse and a repetitive pulse train on transcription in dipteran salivary gland cells. The single pulse increased the specific activity of messenger RNA after 15 and 45 minutes of exposure. The pulse train increased specific activity only after 45 minutes of exposure.
Sally Z. Child, Edwin L. Carstensen, Shung K. Lam · 1979
P. S. Rai, H. J. Ball, S. O. Nelson, L. E. Stetson · 1977
Stuart O. Nelson · 1976
P. S. RAI, H. J. BALL, S. O. NELSON, L. E. STETSON · 1975
In mating combinations that included a treated male, females laid significantly fewer eggs than in combinations with a treated female, and egg production decreased with longer exposure times. Hatch percentages did not differ significantly across any mating combination. Progeny of RF-treated adults laid far fewer eggs (142.9 vs 296.9) but had similar hatch rates (71.0% vs 77.7%). Adults emerging from RF-treated larvae also laid fewer eggs (81.1-98.1 vs 154.4) with no significant difference in hatch percentages.
P. S. RAI, H. J. BALL, S. O. NELSON, L. E. STETSON · 1974
Three-day postemergence adult mealworm beetles were exposed to continuous-wave 39-MHz RF electric fields at 2.5 kV for 4.0 seconds. In ovarian tissue, trophocyte disintegration and vacuole formation appeared at 3 days post-treatment and increased by 6 days with most germarium cells disintegrated. Oocytes from treated adults stained darker and germinal vesicles showed clear areas not seen in controls at 6 days post-treatment.
Stuart O. Nelson, Laverne E. Stetson · 1974
Researchers reviewed principles for controlling stored-product insects with radio-frequency energy and presented data on dielectric properties of insects and grain. Experimental results confirmed that 39 MHz treatment achieved complete weevil mortality at lower wheat temperatures than 2450 MHz treatment. Delayed mortality was also more severe at 39 MHz than at 2450 MHz. Cost estimates indicated RF methods might be three to five times more expensive than chemical controls.
S. O. Nelson · 1974
S. O. Nelson, L. E. Stetson · 1974
Researchers compared 39-MHz and 2450-MHz radiofrequency electric fields for killing adult rice weevils in hard red winter wheat. Complete mortality was reached at 39 MHz with grain temperatures of about 40°C, whereas 2450 MHz needed about 80°C. Insects surviving 39-MHz exposure showed severe injury and high delayed mortality, while those surviving 2450-MHz exposure moved normally. Progeny emergence was nearly eliminated at 39 MHz above 50°C but persisted across most 2450-MHz treatments.
Bernard Greenberg · 1972
Researchers periodically surveyed springtails and three groups of mites during summer 1971 at four habitats along the Sanguine antenna and a power substation plot, with control sites 7 to 12 miles away. Fourteen of 16 tests showed no significant differences in arthropod abundance between test and control sites. The two marginal differences each involved only one arthropod group, with one showing more springtails in the control plot and the other showing more cryptostigmatid mites in the test plot, though both differences were of doubtful significance. Midsummer population peaks occurred in both test and control plots, and community ratios remained stable over two years of antenna operation, indicating no Sanguine effect.
P. S. Rai, H. J. Ball, S. O. Nelson, L. E. Stetson · 1972
Researchers exposed Tenebrio molitor eggs to 39-MHz radiofrequency electric fields at electrode voltages of 2 to 4 kilovolts for 2 to 64 seconds. Percent hatch of 1- and 3-day-old eggs decreased as RF energy level increased, and 1-day-old eggs were more susceptible than 3-day-old eggs. No larvae survived from 1-day-old eggs treated at 4 kilovolts for 32 and 64 seconds, while 3-day-old eggs treated similarly showed low but higher larval survival.
S. O. Nelson · 1972
Gamma radiation at 16 kilorads can sterilize most stored-grain insects, while 20 to 30 kilorads may be needed for all species, and the FDA has approved its use for wheat and wheat flour. Infrared heating of grain to 65°–70°C controls all developmental stages of stored-grain insects, but the treatment cost has prevented practical use.
S. O. Nelson, L. F. Charity · 1972
Stuart O. Nelson · 1972
Russell L. Carpenter, Elliot M. Livstone · 1971
The study irradiated early pupae of the mealworm beetle Tenebrio molitor with 10-GHz CW radiation at waveguide powers of 80 mW for 20 or 30 minutes or 20 mW for 120 minutes. In control groups without microwave power, 90 percent of pupae metamorphosed into normal adult beetles, while in irradiated groups only .24 percent developed normally, 25 percent died, and 51 percent developed abnormally. When the thermal conditions were duplicated by radiant heating, pupal development was normal.
M. A. K. Hamid, R. J. Boulanger · 1969
A. M. Kadoum, S. O. Nelson, L. E. Stetson · 1967
Ahmed M. Kadoum, Harold J. Ball, LaVerne E. Stetson · 1967
A. M. Kadoum, H. J. Ball, S. O. Nelson · 1967
Researchers exposed yellow mealworm larvae to radiofrequency electric fields at sublethal levels and observed the resulting adults. Exposures during the sixth instar caused leg malformations and absences, while fifth-instar exposures did not affect leg development. Longer exposure times reduced the number of imaginal legs that developed, and exposures later in the last instar caused more severe damage.
Nelson, Stuart O. · 1966
Gamma and x radiation eradicated screwworm and melon fly through reproductive sterilization. Insect light traps controlled tobacco hornworm populations. Grain beetles were killed by y rays, radiofrequency electric fields, or infrared radiation without harming grain nutrition. The possibility of using sound and ultrasonic energy to control insect population age was suggested.
Vernon H. Baker, Dennis E. Wiant, Oscar Taboada · 1956
L. M. Liu, F. J. Rosenbaum, W. F. Pickard