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Udupi, Jul 18: Noted multi-lingual scholar Dr Uliyar Padmanabha Upadhyaya passed away last night at a private hospital in Manipal. The 88-year-old was survived by a son and a daughter.

His wife Susheela Uadhyaya, who was also a multi-lingual scholar, had passed away in January 2014 at the age of 77. The duo had compiled the six-volume Tulu Lexicon. Its first volume was published in 1988 and the last volume in 1997.

Son of Sitaram Upadhyaya, who was a scholar in the court of the Raja of Travancore, Dr Padmanabha was born on April 10, 1932 at Uliyar in Majur Village near Kaup in Udupi district. 

The Upadhyaya couple had conducted serious research work in linguistics and folk culture and produced a number of books-some of them jointly, some individually and some in collaboration with others. 

Dr Padmanabha had acquired three Master of Arts degrees in Sanskrit, Kannada and Linguistics from Madras, Kerala and Pune Universities, Vidwan in Hindi and PhD in Linguistics from the Pune University for his thesis titled “A Comparative Study of Kannada Dialects”.

He was a visiting Professor at the Universities of London and Paris. He knew Hindi, Kannada, Tulu, Malayalam, Tamil, English, French and Olof, the language of Senegal in Africa.

His works include Nanjanagudu Kannada (Vokkaliga Dialect), Coorg Kannada, Kuruba - A Dravidian Language, Kannada - A Phonetic Language, Malayalam Language and Literature (with Ms. Susheela), Effect of Bilingualism on Bidar Kannada, Coimbatore Tamil, Kannada as Spoken by Different Population Groups in Mysore City, Dravidian and Negro African: Ethno Linguistic Study (with Ms. Susheela), Conversational Kannada, Coastal Karnataka and Bhuta Worship: Aspects of a Ritualistic Theatre (with Ms. Susheela).

Also Read: Eminent linguist Dr Susheela P Upadhyaya no more

The current physical distancing guidelines provided by the World Health Organisation (WHO) and by the US Centers for Disease Control and Prevention (CDC) may not be adequate to curb the coronavirus spread, according to a research which says the gas cloud from a cough or sneeze may help virus particles travel up to 8 metres. The research, published in the Journal of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.

Study author, MIT associate professor Lydia Bourouiba, warned that droplets of all sizes can travel 23 to 27 feet, or 7-8 metres, carrying the pathogen.

According to Bourouiba, the current guidelines are based on "arbitrary" assumptions of droplet size, "overly simplified", and "may limit the effectiveness of the proposed interventions" against the deadly pandemic.

 She explained that the old guidelines assume droplets to be one of two categories, small or large, taking short-range semi-ballistic trajectories when a person exhales, coughs, or sneezes.

However based on more recent discoveries, the MIT scientist said, sneezes and coughs are made of a puff cloud that carries ambient air, transporting within it clusters of droplets of a wide range of sizes.

Bourouiba warned that this puff cloud, with ambient air entrapped in it, can offer the droplets moisture and warmth that can prevent it from evaporation in the outer environment.

"The locally moist and warm atmosphere within the turbulent gas cloud allows the contained droplets to evade evaporation for much longer than occurs with isolated droplets," she said.

"Under these conditions, the lifetime of a droplet could be considerably extended by a factor of up to 1000, from a fraction of a second to minutes," the researcher explained in the study.

The MIT scientist, who has researched the dynamics of coughs and sneezes for years, added that these droplets settle along the trajectory of a cough or sneeze contaminating surfaces, with their residues staying suspended in the air for hours.

"Even when maximum containment policies were enforced, the rapid international spread of COVID-19 suggests that using arbitrary droplet size cutoffs may not accurately reflect what actually occurs with respiratory emissions, possibly contributing to the ineffectiveness of some procedures used to limit the spread of respiratory disease," Bourouiba wrote in the study