Journalist Gauri Lankesh, who led crusade against communalism, shot dead

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.

Mangaluru, Mar 25: Fishing boats returned to the old Port in Mangaluru after the government prohibited deep-sea fishing till further orders on Wednesday to prevent the assembly of a large gathering here in the wake of the novel coronavirus pandemic. 

According to officials, deep-sea fishing activities result in the gathering of a large number of people and is much against the government's direction on maintaining social distancing. 

According to the Department, the 42-Km coastline in Dakshina Kannada hass 57 purse seine boats, 1,270 trawl boats, 1,483 gillnet boats, 549 other mechanised boats.

Bengaluru, Feb 10: Senior Congress leader DK Shivakumar on Sunday hit out at the BJP and RSS for taking out a route march in Ramanagara against the controversial Jesus Christ statue.

“Just because the BJP won 25 seats in the Lok Sabha polls, Congress workers need not lose hope. If the Congress and JD(S) had worked out a better strategy, the BJP would not have won even 10 seats. We will correct our mistakes,” the former Congress minister said.

After the Lok Sabha polls, the BJP has failed to do well in assembly polls and has been losing power in many states. People are hitting the streets protesting against its policies such as CAA and NRC, he said.

Accusing the BJP and RSS of not being able to digest Congress’ victory in the Bengaluru Rural Lok Sabha segment in the 2019 Lok Sabha polls, he said that the BJP is trying hard to make inroads into the constituency represented by his brother D K Suresh. “Let them take out route march, we don’t care,” he said.

“We all know what the BJP did during the Lok Sabha elections, and the media reported how much money they spent in the elections. What was the Election Commission doing? Was the Income Tax Department sitting with its eyes closed? Why did they conduct raids only in Hassan, Shivamogga and Mandya districts,” he asked.

He alleged that false cases were slapped when him and other leaders, including H D Kumaraswamy, Siddaramaiah, G Parameshwara and Dinesh Gundurao.