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Your search keyword '"Shekhar, M S"' showing total 148 results
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148 results on '"Shekhar, M S"'

9. Western disturbances and climate variability: a review of recent developments.

Author

Hunt, Kieran M. R., Baudouin, Jean-Philippe, Turner, Andrew G., Dimri, A. P., Jeelani, Ghulam, Pooja, Chattopadhyay, Rajib, Cannon, Forest, Arulalan, T., Shekhar, M. S., Sabin, T. P., and Palazzi, Eliza

Subjects
WEATHER hazards, ATMOSPHERIC models, CYCLONES, WESTERLIES, WATER security, HAILSTORMS, CLIMATE change
Abstract

Western disturbances (WDs) are synoptic-scale weather systems embedded within the subtropical westerly jet. Manifesting as upper-level troughs often associated with a lower-tropospheric low over Western India, they share some dynamical features with extratropical cyclones. WDs are most common during the boreal winter (December to March), during which they bring the majority of precipitation – both rain and snow – to the Western Himalaya, as well as to surrounding areas of north India, Pakistan and the Tibetan Plateau. WDs are also associated with weather hazards such as heavy snowfall, hailstorms, fog, cloudbursts, avalanches, frost, and coldwaves. In this paper, we review the recent understanding and development on WDs. Recent studies have collectively made use of novel data, novel analysis techniques, and the increasing availability of high-resolution weather and climate models. This review is separated into six main sections – structure and thermodynamics, precipitation and impacts, teleconnections, modelling experiments, forecasting at a range of scales, and paleoclimate and climate change – each motivated with a brief discussion of the accomplishments and limitations of previous research. A number of step changes in understanding are synthesised. Use of new modelling frameworks and tracking algorithms has significantly improved knowledge of WD structure and variability, and a more frequentist approach can now be taken. Improved observation systems have helped quantification of water security over the Western Himalaya. Convection-permitting models have improved our understanding of how WDs interact with the Himalayas to trigger natural hazards. Improvements in paleoclimate and future climate modelling experiments have helped to explain how WDs and their impacts over the Himalaya respond to large-scale natural and anthropogenic forcings. We end by summarising unresolved questions and outlining key future WD research topics. [ABSTRACT FROM AUTHOR]

Published
2024
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49. Flow cytometry analysis of apoptotic progression and expression analysis of four apoptosis-related genes in Penaeus vannameiin response to white spot syndrome virus infection

Author

Swathi, A., Shekhar, M. S., Katneni, Vinaya Kumar, and Vijayan, K. K.

Abstract

Flow cytometry analysis was carried out to detect the progression of apoptosis in haemocytes of WSSV infected Penaeus vannameiat different time-points (1.5 hpi, 18 hpi and 56 hpi). Apoptosis in haemocytes was found to increase with time of infectivity from 5.06 to 69.63%. Quantitative real-time PCR (qPCR) was used for the expression analysis of four apoptosis-related genes such as Death-associated protein 1, caspase-5, translationally controlled tumor protein, and cathepsin D. The evidence of apoptosis in haemocytes of P. vannameiwas established as shown by significant increase in the percentage of late apoptotic cells due to WSSV infection in shrimp. The present study gives an insight to the apoptosis rate in a WSSV infected shrimp during the course of infection and the role of apoptosis related genes.

Published
2021
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