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New Delhi, Jun 13: Veteran Urdu poet Anand Mohan Zutshi 'Gulzar' Dehlvi passed away on Friday afternoon, five days after he recovered from COVID-19.

He died at his Noida home, and was a month shy of turning 94.

"His corona test came negative on June 7 and we brought him home. Today he had lunch and at around 2.30pm he passed away," his son Anoop Zutshi told PTI.

"He was quite old, and the infection had left him very weak. So doctors are thinking it was possible a cardiac arrest," he added.

A freedom fighter and a premier 'inquilabi' poet, Dehlvi was admitted to a private hospital on June 1 after testing positive for coronavirus.

Born in old Delhi's Gali Kashmeerian in 1926, he was also the editor of 'Science ki Duniya', the first Urdu science magazine published by the Government of India in 1975.

Remembering her fond memories of Dehlvi, historian-writer Rana Safvi recalled seeing the poet at most 'mushairas' in Delhi.

"I cannot express how big a loss it is. We used to see him at every 'mushaira' in Delhi. It's a big loss to Delhi and the world of poetry," Safvi said.

She also took to Twitter to express her condolences.

"Sad to hear about Gulzar Dehlvi saheb's demise. He was the quintessential Dilli waala. May he rest in peace," she tweeted.

According to Delhi-based poet and lawyer Saif Mahmood, Dehlvi was "the presiding bard of Delhi", following in the footsteps of iconic poets like Mirza Ghalib, and Mir Taqi Mir.

His death is the "end of an era", he said.

"No one knew the nooks and crannies of Mir and Ghalib's Delhi like him. Gulzar saheb claimed that his father, Allama Pandit Tribhuvan Nath Zutshi 'Zaar Dehlvi', was a disciple of the renowned poet Daagh Dehlvi," he said, while reminiscing his meeting with Dehlvi three years back.

The poet had recited a still unpublished 'sher' (couplet) then, Mahmood said, which seems more relevant now in the aftermath of his demise.

"Mere baad aane waalon, meri baat yaad rakhna/ mere naqsh-e-pa se behtar, koi raasta nahin hai". (Those who come after, remember what I say/ there’s no better way than to follow my footprints).

"He was a true exemplar of not just the Urdu language but also of the Urdu culture. In fact he was a living and breathing form of Urdu tehzeeb," Mahmood said.

London, May 20: The current physical distancing guidelines of 6 feet may be insufficient to prevent COVID-19 transmission, according to a study which says a mild cough in low wind speeds can propel saliva droplets by as much as 18 feet.

Researchers, including those from the University of Nicosia in Cyprus, said a good baseline for studying the airborne transmission of viruses, like the one behind the COVID-19 pandemic, is a deeper understanding of how particles travel through the air when people cough.

In the study, published in the journal Physics of Fluids, they said even with a slight breeze of about four kilometres per hour (kph), saliva travels 18 feet in 5 seconds.

"The droplet cloud will affect both adults and children of different heights," said study co-author Dimitris Drikakis from the University of Nicosia.

According to the scientists, shorter adults and children could be at higher risk if they are located within the trajectory of the saliva droplets.

They said saliva is a complex fluid, which travels suspended in a bulk of surrounding air released by a cough, adding that many factors affect how saliva droplets travel in the air.

These factors, the study noted, include the size and number of droplets, how they interact with one another and the surrounding air as they disperse and evaporate, how heat and mass are transferred, and the humidity and temperature of the surrounding air.

In the study, the scientists created a computer simulation to examine the state of every saliva droplet moving through the air in front of a coughing person.

The model considered the effects of humidity, dispersion force, interactions of molecules of saliva and air, and how the droplets change from liquid to vapour and evaporate, along with a grid representing the space in front of a coughing person.

Each grid, the scientists said, holds information about variables like pressure, fluid velocity, temperature, droplet mass, and droplet position.

The study analysed the fates of nearly 1,008 simulated saliva droplets, and solved as many as 3.7 million equations.

"The purpose of the mathematical modelling and simulation is to take into account all the real coupling or interaction mechanisms that may take place between the main bulk fluid flow and the saliva droplets, and between the saliva droplets themselves," explained Talib Dbouk, another co-author of the study.

However, the researchers added that further studies are needed to determine the effect of ground surface temperature on the behaviour of saliva in air.

They also believe that indoor environments, especially ones with air conditioning, may significantly affect the particle movement through air.

This work is important since it concerns safety distance guidelines, and advances the understanding of the transmission of airborne diseases, Drikakis said.