Browsing by Author "Saravanan M"

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    ACUTE AND SUBLETHAL INTOXICATION OF DELTAMETHRIN IN AN INDIAN MAJOR CARP, LABEO ROHITA: HORMONAL AND ENZYMOLOGICAL RESPONSES
    (The Journal of Basic & Applied Zoology, 2015-04-03) Suvetha L; Saravanan M; Hur JH; Ramesh M; Krishnapriya K
    This study aimed to evaluate the median lethal concentration (LC50), acute (24 and 96 h) and sublethal (35 d) effects of deltamethrin, a synthetic pyrethroid pesticide on hormonal and enzymological responses in an Indian major carp, Labeo rohita. In this study, the LC50 values of deltamethrin for 24 and 96 h were found to be 0.438 and 0.38 mg L-1, respectively. During acute (0.438 mg L-1) and sublethal (1/10th of 24 h LC50 value, 0.0438 mg L-1) studies, plasma cortisol and prolactin levels were significantly increased (p< 0.05). When compared with the control group, a significant (p< 0.05) increase in alkaline phosphatase (ALP) activity was observed in liver and kidney of fish treated with deltamethrin. However, a significant decrease in the activity of acid phosphatise (ACP) was observed in liver and kidney of deltamethrin exposed fish. In addition, cholinesterase (ChE) activity was significantly (p <0.05) decreased in the plasma of fish exposed to both acute and sublethal concentrations of deltamethrin. These results suggest that the tested concentrations of deltamethrin could have significant adverse effects on the hormonal and enzymological parameters of fish L. rohita. The alterations of these parameters can be effectively used to monitor the impact of deltamethrin in aquatic ecosystem.
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    ECOLOGICAL RISK ASSESSMENT OF SILICON DIOXIDE NANOPARTICLES IN A FRESH-WATER FISH LABEO ROHITA: HEMATOLOGY, IONOREGULATION AND GILL NA+/K+ATPASE ACTIVITY
    (Ecotoxicology and Environmental Safety, 2015-05-19) Krishnapriya K; Ramesh M; Saravanan M; Ponpandian N
    The fate and effect of nanomaterials in the environment has raised concern about their environmental risk to aquatic organisms. Silica nanoparticles (SiO2-NPs) find its uses in various fields and are inevitably released into the environment. However, the ecotoxicological effects of SiO2-NPs on the freshwater fish remain poorly understood. The aim of this study was to evaluate the effect of different concentrations (1, 5 and25mgL_1) of SiO2-NPs on certain hematological, ionoregulatory and enzymological profiles of a freshwater teleost fish Labeo rohita. Hematological parameters such as hemoglobin(Hb), hematocrit (Hct), red blood cells (RBC), white blood cells (WBC), mean corpuscular volume (MCV), mean corpuscular hemoglobin (MCH) and mean corpuscular haemoglobin concentration (MCHC) values were altered in SiO2-NPs treated groups. Likewise, plasma electrolytes such as plasma sodium (Na+), potassium (K+) and chloride (Cl-) levels and Na+/K+ATPase activity in gill of SiO2-NPs treated groups were altered in all concentrations throughout the study period (96h). The alterations of these parameters were found to be dependent on dose and exposure period. The results of the present study indicate that the alterations of these parameters may relate to physiological stress system to SiO2-NPs toxicity and also demonstrate that manufactured metaloxide NPs in aquatic environment may affect the health condition of the aquatic organisms
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    STRUCTURAL AND OPTICAL CHARACTERIZATION OF PURE AND STARCH-CAPPED ZNO QUANTUM DOTS AND THEIR PHOTOCATALYTIC ACTIVITY
    (Springer Berlin Heidelberg, 2015-02) Vidhya K; Saravanan M; Bhoopathi G; Devarajan VP; Subanya S
    Among the different types of metal oxides, zinc oxide (ZnO) is a most commonly used metal oxide in a broad variety of applications. In the present investigation, a modified green synthesis route was used to synthesize pure and starch-capped ZnO (ZnO/starch) quantum dots (QDs) and studied their structural and optical characteristics. In this study, hexagonal crystal structure was observed in both pure and ZnO/starch QDs using X-ray diffraction technique. A spherical-shaped surface morphology was found with the size of 5–10 nm using transmission electron microscope technique. The interaction between ZnO QDs and starch molecules was proved via Fourier infra-red spectrometer technique. On the other hand, their fluorescence behaviors were investigated using photoluminescence technique, in that the ZnO/starch QDs showed an