Browsing by Author "Kanishka Srivastava"

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Algal biofilms: Potential wastewater treatment applications and biotechnological significance
(Elsevier, 2022) Kanishka Srivastava; Sweta Singh; Meenakshi Singh; Farzin Parabia; K. Chandrasekhar
Algae are ubiquitous autotrophic unicellular to multicellular thallophytes. They grow naturally in aquatic environments, including the wastewaters, and their biomass can be harvested easily in benthic conditions. Algae, in association with other microorganisms, form a thin film that attaches itself to solid surfaces enclosed in a matrix of extracellular polymeric substances (EPS). Therefore, the algal–microbial consortium has dominated the biofilm communities that colonize the illuminated surfaces under moisture and nutrients. Like bacterial biofilms, algal biofilms can respond to environmental changes, establish colonies on a surface, and isolate one colony or clumps from a surface. Though algal biomass is a low-cost nutrient removal source for bioproduct processing, its efficient application in wastewater treatments is not accepted worldwide. The chapter discusses the processes of algal-based wastewater treatment biofilm systems on the basis of the available literature, prohibiting efficient systems from being developed and applied to municipal, agricultural, and agrarian waste stream applications. The chapter outlines the need to explore factors influencing algal formation, mass migration, species collection, algal–bacterial interactions, and laboratory testing to establish an algal biofilm-based technical framework to combine wastewater treatment and biomass processing. © 2022 Elsevier Inc. All rights reserved.
Facets of diatom biology and their potential applications
(Springer Science and Business Media Deutschland GmbH, 2022) Navonil Mal; Kanishka Srivastava; Yagya Sharma; Meenakshi Singh; Kummara Madhusudana Rao; Manoj Kumar Enamala; K. Chandrasekhar; Murthy Chavali
Diatoms are the reservoir of bioactive compounds which have immense application in nutrition, industrial commodities and ecological studies. In the oceans, diatoms form a large bloom of silica under favourable conditions, whereas, in lentic and lotic systems, they colonize according to seasonal disturbances. Notably, the survival of diatoms in a stressed environment is because of their uniqueness; therefore, diatoms serve as an ideal candidate to understand the evolutionary paradigm and successional dynamics. This review outlines the biological uniqueness of diatoms, their role in biogeochemical cycles and the recolonization pattern of diatoms in anthropic disturbed habitats. Furthermore, a detailed discussion on different technologies for extracting valuable biomolecules with an emphasis on lipid extraction has been carried out. Moreover, the diatom-based photosynthetic biorefinery approach for a better understanding of the renewable usage of biomass is done. Graphical abstract: [Figure not available: see fulltext.]. © 2021, Springer-Verlag GmbH Germany, part of Springer Nature.