Cong minority cell pays rich tributes to departed leader

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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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

Tumakuru, Jul 12: A four-year-old boy was killed by a leopard at Rajendrapur hamlet at Hasige Hobli village near Huliyurdurga in Kunigal taluk.

Police said on Sunday that this was the third such attack by big cats in the district in a span of six months.

Forest officials said that the boy had gone with his mother to wash clothes at a tank and the animal attacked him while playing there on Saturday late evening. 

A passerby who witnessed the incident scared the animal, it escaped leaving the boy’s body behind.

New Delhi, Feb 7: The Supreme Court on Friday issued a notice to the Central government on a plea challenging the Constitutional validity of the Citizenship Amendment Act (CAA) and effective implementation of the Assam Accord.

A bench of Chief Justice of India (CJI) SA Bobde also sought Centre's response on the plea filed by Assam Social Justice Forum.

The petition sought appropriate directions for taking effective steps for the implementation of Assam Accord, 1985 in letter and spirit and for conservation and preservation of the of a distinct culture, heritage and traditions of the indigenous people of Assam.

The Assam Accord, 1985, had fixed March 24, 1971, as the cut-off date for deportation of all illegal immigrants irrespective of their religion.

The Bench also sought Centre's response on another fresh batch of pleas challenging CAA and tagged them along with other petitions pending in the matter.

One of the petitions, filed by the Association of Advocates from Maharashtra among others, sought to declare the Citizenship Amendment Act as discriminatory, arbitrary, and illegal and consequently set aside the impugned act as ultra-vires the Constitution of India.

On the other hand, over a hundred petitions have been filed in the apex court, for and against the amended citizenship law, which is facing opposition and protests across the country.

CAA grants citizenship to Hindus, Sikhs, Buddhists, Jains, Parsis and Christians who fled religious persecution in Afghanistan, Bangladesh, and Pakistan and took refuge in India on or before December 31, 2014.