Cops avert murder and communal riot by arresting Bajrang Dal leader, associates

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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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

Bengaluru, May 15 Reformed underworld don N Muthappa Rai died battling cancer at a private hospital here on Friday, hospital sources said.

Rai, 68, was suffering from brain cancer for the past one year and was admitted at Manipal Hospital on Old Airport Road, where he died at 2.30 am, the sources said. Rai is survived by two sons.

Born into a Tulu-speaking Bunt family in Dakshina Kannada''s Puttur town, Rai entered the crime world at a very young age.

Karnataka police issued arrest warrants against Rai in eight cases, including murder and conspiracy.

In 2002, Rai was deported to India from the United Arab Emirates. On arrival, he was questioned by various investigation agencies such as the Central Bureau of Investigation (CBI), Research and Analysis Wing (RAW) and Intelligence Bureau (IB), and by the Karnataka police. He was later acquitted due to the lack of evidences.

In his reformed years, Rai founded charitable organisation ''Jaya Karnataka''.

Rai has appeared in Tulu film ''Kanchilda Baale'' in 2011 and Kannada film ''Katari Veera Surasundarangi'' in 2012.

Bollywood director Ram Gopal Varma wanted to make a movie based on Rai''s life. The film roped in actor Vivek Oberoi for the lead role and was shot in Bengaluru, Mangaluru, Mumbai, Dubai and London. However, it has not been released due to production delays.

Rai was enthusiastic about the film and even celebrated his birthday with Varma and Oberoi.

After his cancer diagnosis, Rai withdrew from public life and resigned from Jaya Karnataka.

His last rites are likely to be performed at Bidadi on Friday, family sources said.