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Toxicological effects of TiO_(2) nanoparticles on plant growth promoting soil bacteria

Emerging Contaminants 2020年第1期6卷 87-92页

作者： Sangeeta Chavan Vishwas Sarangdhar vigneshwaran nadanathangam Caius Research Laboratory St.Xavier’s CollegeMumbaiIndia Nanotechnology Research Group Central Institute for Research on Cotton TechnologyMumbaiIndia

Emerging contaminants like metal nanoparticles get introduced into soil through different *** effects of these contaminants on plant growth-promoting bacteria(PGPB),which influence plant productivity,can be detrimental to soil *** dioxide is one of the most produced nanomaterials in the world and therefore potentially the most released nanoform in *** objective of this study was to evaluate the toxic effects of titanium dioxide nanoparticles(TiO2 NPs)on plant growth-promoting *** types of PGPB,viz.,nitrogen fixers,phosphate solubilizers and biofilm formers were exposed to TiO2 *** results suggest that direct contact of the bacteria with these NPs is inhibitory as compared to when these bacteria are growing in laboratory nutrient media in the presence of *** inhibitory effect did not follow a linear dose response but instead showed a pronounced step *** with their varying characteristics may not afford the same protection to bacteria as laboratory nutrient media and thus TiO2 NPs may cause some sensitive PGPB to disappear from *** resultant shift in bacterial community composition may affect ecosystem functioning.

关键词： Titanium dioxide nanoparticles PGPB Nitrogen fixers Phosphate solubilizers Biofilm formers Step response

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Energy Efficient Manufacturing of Nanocellulose by Chemo- and Bio-Mechanical Processes: A Review

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World Journal of Nano Science and Engineering 2015年第4期5卷 204-212页

作者： Ashok K. Bharimalla Suresh P. Deshmukh Prashant G. Patil nadanathangam vigneshwaran ICAR-Central Institute for Research on Cotton Technology Mumbai India Department of General Engineering Institute of Chemical Technology Mumbai India

Nanocellulose is a new-age material derived from cellulosic biomass and has large specific surface area, high modulus and highly hydrophilic in nature. It comprises of two structural forms viz., nanofibrillated cellulose (NFC) and nanocrystalline cellulose (NCC). This review provides a critical overview of the recent methods of bio- and chemo-mechanical processes for production of nanocellulose, their energy requirements and their functional properties. More than a dozen of pilot plants/commercial plants are under operation mostly in the developed countries, trying to exploit the potential of nanocellulose as reinforcing agent in paper, films, concrete, rubber, polymer films and so on. The utilization of nanocellulose is restricted mainly due to initial investment involved, high production cost and lack of toxicological information. This review focuses on the current trend and exploration of energy efficient and environment-friendly mechanical methods using pretreatments (both chemical and biological), their feasibility in scaling up and the future scope for expansion of nanocellulose application in diverse fields without impacting the environment. In addition, a nanocellulose quality index is derived to act as a guide for application based screening of nanocellulose production protocols.

关键词： Biodegradable Energy Conservation Mechanical Process Nanocellulose Pretreatment

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