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Pathogenicity of Vibrio harveyi and its biocontrol using bacteriophages

Systems Microbiology and Biomanufacturing 2023年第4期3卷 552-570页

作者： Smita Ghosh Priyanka Kar sudipta chakrabarti Shrabani Pradhan Keshab Chandra Mondal Kuntal Ghosh Department of Biological Sciences Midnapore City CollegeMidnaporeWest BengalIndia Biodiversity and Environmental Studies Research Center Midnapore City CollegeVidyasagar UniversityMidnaporeWest BengalIndia Department of Microbiology Vidyasagar UniversityMidnaporeWest BengalIndia

Vibrio harveyi is a Gram-negative,rod-shaped,polar flagellate,facultatively anaerobic,halophilic,bioluminescent marine bacteria that belongs to the family of Vibrionaceae,class,*** pathogenic organism is responsible for various diseases of vertebrates and invertebrates in marine habitats,including shrimp *** symptoms like lesions,gastroenteritis,skin ulcers,eye lesions,and tail rot have been observed due to *** *** pathogenic-ity mechanism of *** involves endotoxin lipopolysaccharide,extracellular proteases,and bacteriophage *** genes encoded extracellular hemolysin-like phospholipase B toxin could inactivate fish species via the caspase inactivation pathway,ultimately leading to *** addition,VBNC(viable but nonculturable)cells are another basis of vibriosis outbreaks in the shrimp aquaculture *** extensive amount of antibiotic use promotes the generation of multidrug-resistant ***,as an alternative strategy to combat *** infection,bacteriophages are utilized as a biocontrol ***,there is a lack of research on the immobilization and development of encapsulation strategies of ***-infecting bacteriophages which need to be studied *** conclusion,the pathogenicity of *** and its biocontrol by bacteriophages has been documented in this review.

关键词： Shrimp Antibiotic resistance Bacteriophage Bioluminescence Biofilm

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Unusual Change in Critical Frequency of F<sub>2</sub>Layer during and Prior to Earthquakes

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Open Journal of Earthquake Research 2017年第4期6卷 191-203页

作者： Soujan Ghosh sudipta Sasmal Subrata Kumar Midya Sandip K. chakrabarti Indian Centre for Space Physics Kolkata India Department of Atmospheric Sciences Calcutta University Kolkata India S. N. Bose National Centre for Basic Sciences Kolkata India

The unusualness in the critical frequency of different layers of earth’s ionosphere is commensurate to be associated with seismic events. We present study of critical frequency of F2 layer (denoted as f0F2) during some major earthquakes in South American region. We use the semi-empirical Barbier’s theorem of air-glow and define a parameter using the critical frequency and virtual height of F2 layer and named it as “F Parameter”. To investigate the variation of this parameter, we consider five large earthquakes in the junction of Nazca plate and South American plate having magnitude greater than M > 6.5 and study the temporal variation of F parameter during these earthquakes. The F Parameter is measured using the ionograms as recorded from the Ionosonde in Jicamarca Radio Observatory (lat. 11.95°S, long 76.87°W) in Chile which lies within the earthquake preparation zones of these five earthquakes. We examine the F Parameter within a span of ±15 days during earthquakes and observed significant change in the evaluated F Parameter in 12 to 3 days prior to the earthquakes. The increment is over +3σ from the normal variation. We also observe significant changes during aftershock events. The solar geomagnetic indices were found to be low which ensures that these anomalies in F Parameter are due to seismic events.

关键词： Earthquake Early Warning Wave Propagation Earthquake Interaction Forecasting and Prediction Ionosphere/Atmosphere Interactions Electrical Properties

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Contaminated Effect of Geomagnetic Storms on Pre-Seismic Atmospheric and Ionospheric Anomalies during Imphal Earthquake

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Open Journal of Earthquake Research 2020年第5期9卷 383-402页

作者： Sagardweep Biswas Subrata Kundu Soujan Ghosh Swati Chowdhury Shih-Sian Yang Masashi Hayakawa Suman Chakraborty Sandip K. chakrabarti sudipta Sasmal Indian Centre for Space Physics Kolkata India Institute of Space Science National Central University Chinese Taipei Hayakawa Institute of Seismo Electromagnetics Co. Ltd. UEC Alliance Center Chofu Tokyo Japan Physical Research Laboratory Navrangpura Ahmedabad India

Study of seismo-ionospheric coupling mechanism demands the quiet geomagnetic condition to eliminate any kind of contamination in the lower atmospheric and ionospheric parameters. In this manuscript, we present the effect of back to back two geomagnetic storms before a strong earthquake happened in Imphal, India on January 4, 2016 (M = 6.7). We studied the lower ionospheric irregularities for the duration of 31 days by computing the nighttime fluctuations in Very Low Frequency (VLF) radio signal received transmitter JJI (22.2 kHz) in Japan at Ionospheric and Earthquake Research Centre & Optical Observatory (IERCOO), Sitapur, India. We also studied the presence of Atmospheric Gravity Wave (AGW) in nighttime VLF signal in lower ionospheric heights and the same computed that from SABER/TIMED satellite. Two geomagnetic storms occurred on December 21, and 31, 2015. By the conventional analysis, we found that there is a significant decrease in nighttime trend and an increase in nighttime fluctuations around 15 days before the earthquake and just on the first storm and thus the pre-seismic effects on VLF signal gets contaminated due to the presence of storms. The wave-like structure in VLF fluctuations shows significant increase in intensity by using Fourier and Wavelet analysis before the earthquake. By analysis of SABER data, we found significant enhancement in AGW around 10 days before the earthquake. As the wavelike structures are coming from neutral acoustics reasons from pressure or temperature variations, this paper exhibits a significant example of contamination in ionospheric parameters due to geomagnetic storm where the acoustics parameters remain un-contaminated.

关键词： Very Low Frequency Wave Propagation Earthquake Precursory Atmospheric Gravity Wave Geomagnetic Strom SABER/TIMED

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