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Author: Priyanka × End date: 2023 × Start date: 2020 × Type: Thesis × Thesis Type: Ph.D ×
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    ThesisItemOpen Access
    Persistence, mitigation and leaching of atrazine and its metabolites in soil
    (CCSHAU, Hisar, 2023-01) Priyanka; Duhan, Anil
    Persistence, mitigation and leaching potential of atrazine and its metabolites in sandy and clay loam soils was studied. Soil samples were collected periodically for dissipation and mitigation studies. Leaching experiment was performed at 50 μg (single dose) and 100 μg (double dose) in both soils taken in plexi glass columns. Enzymatic activities were studied as per the explained method in available literature. Sample preparation techniques i.e. Matrix solid phase dispersion (MSPD), was optimized using different solvents for both soils at fortification level of 0.001 μg/g for sample preparation. The limits of detection and quantification were ranged 0.0005-0.001 and 0.001-0.005μg/g, respectively for AT and metabolites. In clay loam and sandy loam soil, average recoveries of atrazine and metabolites ranged from 81.3-83.1% and 84.2-86.3%, respectively in methanol. Dissipation followed first-order kinetics. The residues reached below detectable limit after 30 and 60 days in sandy loam and clay loam soils, respectively. Presence of organic manures stimulated while BGC inhibited the dissipation of atrazine in both soils. Urease activity decreased up to 30 days and boosted thereafter up to 60 days in all treatments of clay loam soil. AT exhibited deleterious effect on urease activity up to 30 DAT followed by DEA and DIA in clay loam soil. AT and DEA stimulated while DIA inhibited DHG activity on 0 DAT in comparison to control. The residues of atrazine and its metabolites found in leachate fractions suggested about its highly mobile nature, and possible threat of surface and ground water contamination. The presence of a notable collection of residues in leachate fractions suggests the potential for surface and groundwater contamination. DEA and DIA metabolites, in particular, caused springtail Folsomia candida and earthworm Eisenia fetida to have longer and more unacceptable risks. If residues similar to those found in leachate fractions reach water bodies, they may be toxic to a variety of freshwater fish, aquatic arthropods, amphibians, and aquatic invertebrates. Future research should take a more comprehensive approach to assessing ecological health and potential threats to non-target species.
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    ThesisItemOpen Access
    Social Isolation and Cognitive Functioning in Later Life
    (Chaudhary Charan Singh Haryana Agricultural University hisar, 2022-07) Priyanka; Sangwan, Sheela
    Social isolation is a state of complete or near-complete lack of contact between an individual and society. It differs from loneliness, which reflects temporary and involuntary lack of contact with other humans in the world. Social isolation can be an issue for individuals of any age, though symptoms may differ by age group. Cognitive functioning refers to a person's ability to process thoughts. It is defined as "the ability of an individual to perform the various mental activities most closely associated with learning and problem-solving. Researchers like Cacioppo and Hawkley (2009) have highlighted the strong association between social isolation and cognitive functioning. This paper investigates the social isolation and cognitive functioning in later life. The effects of depression, anxiety and stress were explored. An intervention programme to improve the cognitive functioning of low performing elderly was imparted. The study was conducted in the rural and urban areas of Hisar, Rohtak and Karnal district of Haryana state. The results revealed that age, education and occupation, marital status and family type significantly influences the respondent’s performance. The socio-personal variables and supporting variables are the strong predictors which influence the social isolation and cognitive functioning of elderly. Depression was found to be significantly correlated with both social isolation and cognitive functioning of elderly. The findings suggest that the imparting the intervention programme may enhance the cognitive functioning in elderly.