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Toxicity of bisphenol a on humans: a review

100%

Preethi S. , Sandhya K. , Lebonah D. E. , Prasad C. V. , Sreedevi B. , Chandrasekhar K. , Kumari J. P.

International Letters of Natural Sciences

2014

tom 22

Bisphenol A (BPA) is a plastic ingredient produced in large quantities for use primarily in the production of polycarbonate plastics and epoxy resins. The present review focused on different mechanisms of BPA on human health in enzymatic, androgenic, neurological, liver and reproductive systems. The review explained the influence of BPA on different stages of human life likely in foetal stage, children and adults stages. The review also concentrated on how to handle BPA, treatment, preventive measures against BPA exposure.

Optimization of optical characteristics of In0.29Ga0.71As0.99N0.01/GaAs straddled nano-heterostructure

84%

Sandhya K. , Bhardwaj G. , Dolia R. , Lal P. , Kumar S. , Dalela S. , Rahman F. , Alvi P. A.

tom Vol. 26, No. 3

210--216

Designing of a nanoscale Quantum Well (QW) heterostructure with a well thickness of ~60 Å is critical for many applications and remains a challenge. This paper has a detailed study directed towards designing of In0.29Ga0.71As0.99N0.01/GaAs straddled nanoscale-heterostructure having a single QW of thickness ~60 Å and optimization of optical and lasing characteristics such as optical and mode gain, differential gain, gain compression, anti-guiding factor, transparency wavelength, relaxation oscillation frequency (ROF), optical power and their mutual variation behavior. The outcomes of the simulation study imply that for the carrier concentration of ~2 × 10¹⁸cm⁻³ the optical gain of the nano-heterostructure is of 2100 cm⁻¹ at the wavelength is of 1.30 μm. Though the obtained gain is almost half of the gain of InGaAlAs/InP heterostructure, but from the wavelength point of view the InGaAsN/GaAs nano-heterostructure is also more desirable because the 1.30 μm wavelength is attractive due to negligible dispersion in the silica based optical fiber. Hence, the InGaAsN/GaAs nano-heterostructure can be very valuable in optical fiber based communication systems.