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2. Decentralized decision making by an ant colony: drift-diffusion model of individual choice, quorum and collective decision

Author

Pradhan, Smriti, Patra, Swayamshree, and Chowdhury, Debashish

Subjects
Nonlinear Sciences - Adaptation and Self-Organizing Systems, Physics - Biological Physics, Physics - Physics and Society, Quantitative Biology - Populations and Evolution
Abstract

Ants are social insects. When the existing nest of an ant colony becomes uninhabitable, the hunt for a new suitable location for migration of the colony begins. Normally, multiple sites may be available as the potential new nest site. Distinct sites may be chosen by different scout ants based on their own assessments. Since the individual assessment is error prone, many ants may choose inferior site(s). But, the collective decision that emerges from the sequential and decentralized decision making process is often far better. We develop a model for this multi-stage decision making process. A stochastic drift-diffusion model (DDM) captures the sequential information accumulation by individual scout ants for arriving at their respective individual choices. The subsequent tandem runs of the scouts, whereby they recruit their active nestmates, is modelled in terms of suitable adaptations of the totally asymmetric simple exclusion processes (TASEP). By a systematic analysis of the model we explore the conditions that determine the speed of the emergence of the collective decision and the quality of that decision. More specifically, we demonstrate that collective decision of the colony is much less error-prone that the individual decisions of the scout ants. We also compare our theoretical predictions with experimental data., Comment: 12 pages, including 4 figures and 1 table

Published
2021

4. Synthesis of Cu (II) and Zn (II) Complexes of a Quinoline Based Flexible Amide Receptor as Fluorescent Probe for Dihydrogen Phosphate and Hydrogen Sulphate and Their Antibacterial Activity

Author

Dey, Sovan, primary, Ghosh, Sandip, additional, Das, Arindam, additional, Yadav, Ram Naresh, additional, Chakrabarty, Rinku, additional, Pradhan, Smriti, additional, Saha, Dipanwita, additional, Srivastava, Ashok Kumar, additional, and Hossain, Md. Firoj, additional

Published
2023
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5. Siderophore-producing Bacillus amyloliquefaciens BM3 mitigate arsenic contamination and suppress Fusarium wilt in brinjal plants.

Author

Pradhan, Smriti, Choudhury, Abhinandan, Dey, Sovan, Hossain, Md Firoj, Saha, Aniruddha, and Saha, Dipanwita

Subjects
*BACILLUS amyloliquefaciens, *EGGPLANT, *ARSENIC, *BIOLOGICAL pest control agents, *PHYTOPATHOGENIC fungi, *WILT diseases, *FLUORESCENCE spectroscopy
Abstract

Aim: Arsenic contamination in agricultural soils poses a serious health risk for humans. Bacteria that produce siderophores, primarily for iron acquisition, can be relevant in combating arsenic toxicity in agricultural soils and simultaneously act as biocontrol agents against plant diseases. We evaluated the arsenic bioremediation and biocontrol potential of the rhizosphere isolate Bacillus amyloliquefaciens BM3 and studied the interaction between the purified siderophore bacillibactin and arsenic. Methods and results: BM3 showed high arsenic resistance [MIC value 475 and 24 mM against As(V) and As(III), respectively] and broad spectrum in-vitro antagonism against several phytopathogenic fungi. BM3 was identified by biochemical characterization and 16S rRNA gene sequencing. Scanning electron microscopy (SEM) analysis revealed increased cell size of BM3 when grown in presence of sub-lethal arsenic concentrations. Bioremediation assays showed a 74% and 88.1% reduction in As(V) and As(III) concentrations, respectively. Genetic determinants for arsenic resistance (arsC and aoxB) and antifungal traits (bacAB and chiA) were detected by PCR. Arsenic chelating ability of bacillibactin, the siderophore purified from culture filtrate of BM3 and identified through spectroscopic data analysis, was observed in CAS assay and fluorescence spectrometry. In-vivo application of talc-based formulation of BM3 in brinjal seedlings showed significant reduction in Fusarium wilt disease. Conclusion: Strain B. amyloliquefaciens BM3 may be useful in arsenic bioremediation and may be considered for large field trials as an alternative to chemical fungicides by inhibiting soil borne pathogens. [ABSTRACT FROM AUTHOR]

Published
2023
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