Gorakhpur infant deaths: Allahabad HC grants bail to Dr Kafeel Khan

Noida, Jul 16: A key aide of 1993 Mumbai blasts case convict Abu Salem who worked in his illegal property business in NCT of Delhi has been arrested by the Special Task Force (STF) of the Uttar Pradesh police, officials said on Thursday.

Gajendra Singh, who was also close to gangster Khan Mubarak, was nabbed in Mumbai late Wednesday night by the Noida unit of the STF, they said.

"Gajendra Singh had taken Rs 1.80 crore from a Delhi-based businessman in 2014 in a property-related case. When he was pressured to return the money, Singh had Khan Mubarak's shooters open fire at the businessman in sector 18 of Noida," Additional Superintendent of Police, STF, Raj Kumar Mishra said.

The businessman was in his car when the attack took place, and he narrowly escaped, the officials said.

Mishra said Singh had paid the shooters Rs 10 lakh, and the agency has cracked the money trail of the transaction.

"Gajendra Singh also invested Abu Salem and Khan Mubarak's money into properties in Delhi-NCR," the officer added.

Singh was wanted in a couple of cases registered at a police station in Noida where he has been lodged now for further proceedings, the STF 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.