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    Copper toxicity in plants: a review and a case study on tea
    (University of North Bengal, 2020-03) Saha, Dipanwita; Mandal, Sima; Saha, Aniruddha
    Copper in trace amounts is essential for various metabolic processes in the plant such as photosynthesis, carbohydrate distribution, and protein metabolism but at high concentration it causes physiological stress through generation of free radicals that induce the production of reactive oxygen species (ROS) via Haber-Weiss and Fenton reactions. Copper-induced generation of hydrogen peroxide, hydroxyl radicals, or other reactive oxygen species has been directly correlated with the damage to protein and lipids that may lead to reduced growth and even death. Tea (Camellia sinensis L. (O.) Kuntze) is an economically important plantation crop in India with round the year productivity. Copper based fungicides are cheap and effective in controlling fungal diseases and are used consistently throughout the year to combat different fungal diseases that pose a major threat to tea production. Excess Cu2+ has been found to alter several physiochemical parameters in the tea plants. A more detailed study on mechanisms of Cu2+ toxicity at the gene level is warranted.
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    ItemOpen Access
    Copper toxicity In plants: a review and a case study on tea
    (University of North Bengal, 2016-03) Saha, Dlpanwita; Mandal, Sima
    Copper in trace amounts is essential for various metabollc processes In the plant such as photosynthes is, ..:arbohydra te distribution, and protein metabolism but at high concentration it causes physiological stress through genera tion of free radicals that Induce the production of reactive oxygen species (ROS) via Haber \ i\1eiss and Fenton reactions . Copper-Induced generation of hydrogen peroxide, hydroxyl radicals, or other react!\~ oxygen species has been directly .correlated with the damage to protein and lipids that may lead to reduced growth and even death. Tea ( Camellia sinensls (L.) O. Kuntze) is an economically important plantation crop in India w ith round the year productivity. Copper based fungicides are cheap and effective i n controlling funga l diseases and are used consistently throughout the year to combat different fungal diseases that pose a major threat to tea production. Excess Cu 2 + has been found to alter several physiochemical parameters in the tea plants. A more detailed study on mechanisms of Cu 2+ toxicity at the gene level is warranted.
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    ItemOpen Access
    Urbanization of the Siliguri town: Understanding the transformation from Union Board to Municipal Corporation (1915-1994)
    (University of North Bengal, 2018-03) Khasnobish, Sudip
    Siliguri situated in the foothills of the Himalayas and about eight hundred and forty two feet above the sea level is now a part of the district of Darjeeling in the state of West Bengal .During the colonial period there were three police stations under Siliguri subdivision i.e Siliguri, Phansidewa and Khoribari. Siliguri is termed as the uncrowned capital of Northern part of Bengal popularly known as North Bengal. Some notable scholars and academicians have contributed in the studies of urbanization of Darjeeling hill town and very few academic works have been done. The focus was largely on the growing commercial activities of Siliguri after post- partition era. Certain areas of study have not been touched. The proposed article intends to understand the various issues or factors which transformed Siliguri from a sleepy hamlet to a Municipal Corporation within a very short period during 20th century and to find out the importance of its strategic geographical location in the context of ongoing Indo-Chinese conflict after Doklam.
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    ItemOpen Access
    From Obscurity to a Sub-Divisional Headquarter: Siliguri in Colonial Period
    (University of North Bengal, 2017-03) Kumari, Minakshee
    Siliguri is a city which spans across the Darjeeling and Jalpaiguri districts in the Indian state of West Bengal. The city is located on the banks of the Mahananda River and the foothills of the Himalayas. Siliguri is known for its "4T": Tea, Timber, Tourism and Transport and is one of the fastest developing and growing metropolis of the state and also of the country. This city with sky scrapers, big hotels, many residential townships, three Railway stations and airports is boosted as the "Uncrowned capital of North Bengal" by the newspapers. However, a hundred years before this metropolis was only a small village. This research article tries to trace the colonial history of Siliguri, the conduct it received from the colonial rulers and the reasons for its quick unprecedented development.