The Experts below are selected from a list of 192 Experts worldwide ranked by ideXlab platform
Masafumi Yamaguchi - One of the best experts on this subject based on the ideXlab platform.
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Radiation Resistance of compound semiconductor solar cells
Journal of Applied Physics, 1995Co-Authors: Masafumi YamaguchiAbstract:1‐MeV electron irRadiation effects on molecular beam epitaxy‐grown AlGaAs and InGaAs solar cells have been determined and compared with our previous results for Radiation damage of InP and GaAs solar cells in order to clarify Radiation Resistance of compound semiconductor solar cells. Differences of Radiation Resistance of AlGaAs, GaAs, and InGaAs cells are found to be explained by band‐gap energy effects on solar cell degradation. Moreover, 1‐MeV electron irRadiation results of several solar cells such as InP, InGaP, InGaAsP, GaAs, AlGaAs, InGaAs, Si, Ge, and CuInSe2 have also been analyzed by considering their damage constants, band‐gap energies, and optical absorption coefficients. It is found that superior Radiation‐Resistance of CuInSe2 and InP‐based solar cells is explained by the higher optical absorption coefficient of CuInSe2 and lower defect introduction rates (damage constants) of InP‐based materials compared to other compound semiconductor materials.
Daniel D. Stancil - One of the best experts on this subject based on the ideXlab platform.
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Antenna Radiation Resistance in waveguide and in free-space
IEEE Transactions on Antennas and Propagation, 2005Co-Authors: Pavel Nikitin, Daniel D. StancilAbstract:In this paper, we discuss the connection between Radiation Resistance formulas for antenna in free-space and in rectangular waveguide. We demonstrate with the example of monopole antenna that a transformation between the angular direction in free-space and mode indices in waveguide makes the formulas for antenna Radiation Resistance in free-space and in rectangular waveguide equivalent to each other.
Esther H. Chang - One of the best experts on this subject based on the ideXlab platform.
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Oncogenic basis of Radiation Resistance
Advances in cancer research, 1993Co-Authors: Usha Kasid, Kathleen F. Pirollo, Anatoly Dritschilo, Esther H. ChangAbstract:Publisher Summary Oncogenes play an important role in the regulation of cellular Resistance to ionizing Radiation. This chapter reviews some of that evidence and attempt to formulate the themes underlying the oncogenic basis of Radiation Resistance. Cellular Radiation sensitivity is a complex function of diverse molecular, biochemical, genetic, or environmental factors. Ionizing Radiation induces multiple cellular and biological effects either by direct interaction with DNA or through the formation of free radical species leading to DNA damage. These effects include cell cycle-specific growth arrest, the repair of DNA damage, radical-scavenging proteins, gene mutations, malignant transformation, and cell killing. Some of these genes ( ras, raf, cot, mos , and myc ) demonstrate a cooperative effect toward Radiation Resistance. The possibility of a selective interaction among these proteins analogous to that involved in signal transduction leads to cell growth and proliferation or differentiation. Perturbations in the cell cycle (G 1 or G 2 arrest) and cell cycle-related proteins appear to be important factors contributing to cell survival. An important aspect of the Radiation survival response is its regulation at the level of the cell cycle. The modulation of Radiation Resistance, mitogenic signals, Radiation response, and causes or effects of Radiation-resistant phenotype are also discussed in the chapter.
Yong-sun Bahn - One of the best experts on this subject based on the ideXlab platform.
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Microbial Radiation-Resistance mechanisms
Journal of Microbiology, 2017Co-Authors: Kwang-woo Jung, Yong-sun BahnAbstract:Organisms living in extreme environments have evolved a wide range of survival strategies by changing biochemical and physiological features depending on their biological niches. Interestingly, organisms exhibiting high Radiation Resistance have been discovered in the three domains of life (Bacteria, Archaea, and Eukarya), even though a naturally Radiationintensive environment has not been found. To counteract the deleterious effects caused by Radiation exposure, Radiation- resistant organisms employ a series of defensive systems, such as changes in intracellular cation concentration, excellent DNA repair systems, and efficient enzymatic and non-enzymatic antioxidant systems. Here, we overview past and recent findings about Radiation-Resistance mechanisms in the three domains of life for potential usage of such Radiationresistant microbes in the biotechnology industry.
Issay Narumi - One of the best experts on this subject based on the ideXlab platform.
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Unlocking Radiation Resistance mechanisms: still a long way to go
Trends in microbiology, 2003Co-Authors: Issay NarumiAbstract:Abstract Recent transcriptome analysis revealed that Deinococcus radiodurans efficiently coordinate their recovery from ionizing Radiation through a complex network of DNA repair and metabolic pathway switching. However, the additional discovery of numerous irRadiation-response genes has provided new targets for the identification of genes primarily crucial to Radiation Resistance. Investigations based on electron microscopy suggest that the observed Radiation Resistance in D. radiodurans might be partly caused by the presence of an unusual ring-like conformation of nucleoids. Although such investigations provide useful insights into the mechanisms underlying Radiation Resistance, a more detailed empirical explanation of why D. radiodurans is so Radiation resistant is still needed. Further research based on alternative genetic and biochemical approaches should help to gain a better understanding of the mechanisms involved in DNA repair.
