22 research outputs found
Bio-distribution and toxicity assessment of intravenously injected anti-HER2 antibody conjugated CdSe/ZnS quantum dots in Wistar rats
The therapeutic effect of a pulsed electromagnetic field on the reproductive patterns of male Wistar rats exposed to a 2.45-GHz microwave field
INTRODUCTION: Environmental exposure to man-made electromagnetic fields has been steadily increasing with the growing demand for electronic items that are operational at various frequencies. Testicular function is particularly susceptible to radiation emitted by electromagnetic fields. OBJECTIVES: This study aimed to examine the therapeutic effects of a pulsed electromagnetic field (100 Hz) on the reproductive systems of male Wistar rats (70 days old). METHODS: The experiments were divided into five groups: microwave sham, microwave exposure (2.45 GHz), pulsed electromagnetic field sham, pulsed electromagnetic field (100 Hz) exposure, and microwave/pulsed electromagnetic field exposure. The animals were exposed for 2 hours/day for 60 days. After exposure, the animals were sacrificed, their sperm was used for creatine and caspase assays, and their serum was used for melatonin and testosterone assays. RESULTS: The results showed significant increases in caspase and creatine kinase and significant decreases in testosterone and melatonin in the exposed groups. This finding emphasizes that reactive oxygen species (a potential inducer of cancer) are the primary cause of DNA damage. However, pulsed electromagnetic field exposure relieves the effect of microwave exposure by inducing Faraday currents. CONCLUSIONS: Electromagnetic fields are recognized as hazards that affect testicular function by generating reactive oxygen species and reduce the bioavailability of androgen to maturing spermatozoa. Thus, microwave exposure adversely affects male fertility, whereas pulsed electromagnetic field therapy is a non-invasive, simple technique that can be used as a scavenger agent to combat oxidative stress
Synergistic role of hydroxyapatite nanoparticles and pulsed electromagnetic field therapy to prevent bone loss in rats following exposure to simulated microgravity
Biological responses of mobile phone frequency exposure
959-981Existence of low level electromagnetic fields in the environment has been
known since antiquity and their biological implications are noted for several
decades. As such dosimetry of such field parameters and their emissions from
various sources of mass utilization has been a subject of constant concern.
Recent advancement in mobile communications has also drawn attention to their
biological effects. Hand held children and adults alike generally use mobile
sources as cordless phones in various positions with respect to the body.
Further, an increasing number of mobile communication base stations have led to
wide ranging concern about possible health effects of radiofrequency emissions.
There are two distinct possibilities by which health could be affected as a
result of radio frequency field exposure. These are thermal effects caused by
holding mobile phones close to the body and extended conversations over a long
period of time. Secondly, there could be possibly non thermal effects from both
phones and base stations whereby the affects could also be cumulative. Some
people may be adversely affected by the environmental impact of mobile phone
base stations situated near their homes, schools or any other place. In
addition to mobile phones, appliances like microwave oven etc are also in
increasing use. Apart from the controversy over the possible health effects due
to the non-thermal effect of electromagnetic fields the electromagnetic
interaction of portable radio waves with human head needs to be quantitatively
evaluated. Relating to this is the criteria of safe exposure to the population
at large. While a lot of efforts have gone into resolving the issue, a clear
picture has yet to emerge. Recent advances and the problems relating to the
safety criteria are discussed
Principles of nanoscience: An overview
1008-1019The scientific basis of nanotechnology as envisaged
from the first principles is compared to bulk behavior. Development of
nanoparticles having controllable physical and electronic properties has opened
up possibility of designing artificial solids. Top down and bottom up
approaches are emphasized. The role of nanoparticle (quantum dots) application
in nanophotonics (photovoltaic cell), and drug delivery vehicle is discussed.
Fundamentals of DNA structure as the prime site in bionanotechnological
manipulations is also discussed. A summary of presently available devices and
applications are presented
Effects of low level pulsed radio frequency fields on induced osteoporosis in rat bone
581-586<span style="font-size:15.0pt;mso-bidi-font-size:8.0pt;
line-height:115%;font-family:" times="" new="" roman","serif";mso-fareast-font-family:="" "times="" roman";mso-ansi-language:en-us;mso-fareast-language:en-us;="" mso-bidi-language:ar-sa"="">Effect of modulated pulsed electromagnetic fields
(PEMFs; carrier frequency, 14 MHz. modulated at 16 Hz of amplitude 10 V peak to
peak) on sciatic neurectomy induced osteoporosis in rat femur and tibia
resulted in statistically significant increase in bone mineral density, and
deceleration in bone resorption process and consequently further osteoporosis
in rat bone. These results suggest that such an effective window of pulsed
radio frequency fields may be used therapeutically for the treatment of
osteoporosis. </span
Dielectric parameters of dry and wet soils at 14.89 GHz
130-134Dielectric parameters of a number of samples distributed over a wide geographic range of India soils have been measured at 14.89 GHz. A waveguide method involving a two-point solution of a transcendental equation, found to be successful for low and medium loss dielectrics, has been adopted for measurement on dry and wet soil samples. The method can also be applied for other frequency ranges and in the estimation of soil moistures
Bio-distribution and toxicity assessment of intravenously injected anti-HER2 antibody conjugated CdSe/ZnS quantum dots in Wistar rats
Dhermendra K Tiwari1, Takashi Jin2, Jitendra Behari11School of Environmental Sciences, Jawaharlal Nehru University, New Delhi, India; 2WPI-Immunology Frontier Research Center, Osaka University, Osaka, JapanAbstract: Anti-HER2 antibody conjugated with quantum dots (anti-HER2ab-QDs) is a very recent fluorescent nanoprobe for HER2+ve breast cancer imaging. In this study we investigated in-vivo toxicity of anti-HER2ab conjugated CdSe/ZnS QDs in Wistar rats. For toxicity evaluation of injected QDs sample, body weight, organ coefficient, complete blood count (CBC), biochemistry panel assay (AST, ALT, ALP, and GGTP), comet assay, reactive oxygen species, histology, and apoptosis were determined. Wistar rat (8&ndash;10 weeks old) were randomly divided into 4 treatment groups (n = 6). CBC and biochemistry panel assay showed nonsignificant changes in the anti-HER2ab-QDs treated group but these changes were significant (P &lt; 0.05) in QDs treated group. No tissue damage, inflammation, lesions, and QDs deposition were found in histology and TEM images of the anti-HER2ab-QDs treated group. Apoptosis in liver and kidney was not found in the anti-HER2ab-QDs treated group. Animals treated with nonconjugated QDs showed comet formation and apoptosis. Cadmium deposition was confirmed in the QDs treated group compared with the anti-HER2ab-QDs treated group. The QDs concentration (500 nM) used for this study is suitable for in-vivo imaging. The combine data of this study support the biocompatibility of anti-HER2ab-QDs for breast cancer imaging, suggesting that the antibody coating assists in controlling any possible adverse effect of quantum dots.Keywords: cancer bioimaging, HER2, anti-HER2 antibody, quantum dots, comet assa