An Analytic Contemplation of the Conspicuous Vicissitudes in the Histomorphology of Corpuscles of Stannius of a Freshwater Catfish Mystus tengara (Hamilton, 1822) due to the Exposure of ZnS Nanoparticles.

Nilanjana Chatterjee,Baibaswata Bhattacharjee

doi:10.1155/2015/697053

Abstract

Enhanced surface photooxidation property associated with the ZnS nanoparticles caused the reduction of dissolved oxygen content in water in a dose dependent manner, when ZnS nanoparticles of different sizes are exposed to the water in various concentrations. This property was more prominent for ZnS nanoparticles with smaller sizes. Mystus tengara, exposed to ZnS nanoparticles, responded to hypoxia with varied behavioural, physiological, and cellular responses in order to maintain homeostasis and organ function in an oxygen-depleted environment. The histomorphology of corpuscles of Stannius of the fish showed conspicuous vicissitudes under exposure of ZnS nanoparticles. The population of the cell type with granular cytoplasm showed significant increase at the expense of the other that consisted of agranular cytoplasm with increasing nanoparticle concentration. This can be explained as the defence mechanism of the fish against ZnS nanoparticle induced hypoxia and environmental acidification. The altering histomorphology has been studied employing an analytical approach.

Highlights

Owing to their very small sizes, nanoparticles (1–100 nm) have chemical properties that differ from those of their bulk counterparts [1]
Due to enhanced surface photooxidation property of ZnS in its nanoparticle form, the dissolved oxygen content in water is found to reduce in a dose dependent manner from its normal values, when ZnS nanoparticles of different sizes are exposed to the water in various concentrations [4,5,6]
After synthesis the nanoparticles were characterized through transmission electron microscopy (TEM), particle size analysis (PSA), X-ray diffraction (XRD) study, energy dispersive X-ray (EDX) study, and X-ray photoelectron spectroscopy (XPS) study

Summary

Introduction

Owing to their very small sizes, nanoparticles (1–100 nm) have chemical properties that differ from those of their bulk counterparts [1] Because of their increased reactivity, the interaction of these particles with their environment changes [1], which is the reason for environmental concern. Due to enhanced surface photooxidation property of ZnS in its nanoparticle form, the dissolved oxygen content in water is found to reduce in a dose dependent manner from its normal values, when ZnS nanoparticles of different sizes are exposed to the water in various concentrations [4,5,6]. When living in a habitat with low level of dissolved oxygen, fish respond to hypoxia with varied behavioural, physiological, and cellular responses in order to maintain homeostasis and organ function in an oxygendepleted environment [7,8,9,10,11,12,13]

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