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Jun 1: Gold prices rose on Monday as riots in major U.S. cities rattled investors already reeling from strained Sino-U.S. relations and boosted demand for the safe-haven metal, with a weaker dollar lending further support.

Spot gold gained 0.8% to $1,739.75 per ounce by 0242 GMT. U.S. gold futures ticked up 0.1% to $1,752.60.

"Concerns about the unrest in the United States at the moment appear to be weighing on market sentiment," said Michael McCarthy, chief strategist at CMC Markets, adding that rising tensions between the world's top two economies provided further support to gold.

Protesters have flooded the streets in the United States over the death of George Floyd in police custody, in a wave of outrage sweeping a politically and racially divided nation.

The closely packed crowds and demonstrators not wearing masks have sparked fears of a resurgence of COVID-19, which has killed more than 101,000 Americans.

In Asia, China's state media and the government of Hong Kong lashed out on Sunday at U.S. President Donald Trump's pledge to end Hong Kong's special status if Beijing imposes new national security laws on the city.

Gold is often used as a safe store of value during times of political and financial uncertainty.

Indicative of sentiment, holdings of SPDR Gold Trust, the world's largest gold-backed exchange-traded fund, rose 0.3% to 1,123.14 tonnes on Friday, a fresh seven-year high.

Further supporting gold's appeal, the dollar index fell 0.4% against its rivals.

Elsewhere, silver jumped 2% to $18.20 per ounce, its highest since Feb. 26, before retreating slightly to trade 1.8% higher at $18.16.

Speculators cut their bullish positions in COMEX gold and increased them in silver contracts in the week to May 26, the U.S. Commodity Futures Trading Commission said on Friday.

Palladium rose 0.7% to $1,958.25 per ounce, while platinum declined 0.3% to $835.56.

New Delhi, Jun 25: After the Drug Controller General of India (DCGI) given its approval to manufacture and market the generic version of COVID-19 drug Remdesivir, COVIFOR, Hyderabad-based drugmaker Hetero Limited has delivered the first set of 20,000 vials in two equal lots of 10,000 each across 5 states.

The first batch, which is being marketed under the brand name of COVIFOR, was delivered to Maharashtra, Delhi, Gujarat Tamil Nadu and Hyderabad. Hetero has set a target to produce one lakh vials of the drug in two-three weeks.

The other lot would be supplied to Kolkata, Indore, Bhopal, Lucknow, Patna, Bhubaneshwar, Ranchi, Vijayawada, Cochin, Trivandrum and Goa within a week to meet the emergency requirements.

Managing director of Hetero Healthcare M Srinivasa Reddy said “the launch of Covifor in the country is a milestone in addressing public health emergencies. Through Covifor, we hope to reduce the treatment time of a patient in a hospital thereby reducing the increasing pressure on the medical infrastructure overburdened ue to accelerating COVID-19 infection rates," he said as reported by news agency.

"We are closely working with the government and the medical community to make Covifor quickly accessible to both public and private healthcare settings across the country”, Reddy said.

Covifor is a generic brand of Remdesivir which is used for the treatment of COVID-19 in adults and children hospitalised with strong symptoms of the disease. The Health Ministry had, on June 13, recommended the use of anti-viral drug Remdesivir in moderate stage of COVID-19.

Dr Reddys Laboratories and Hetero are among others which have separately entered into non-exclusive licensing agreements with the original drug-maker Gilead Sciences Inc to register, make and sell the investigational drug Remdesivir in India and other countries.

Remdesivir would be made in the company's formulation facility in Hyderabad, which has been approved by global regulatory authorities such as US Food and Drug Administration (USFDA) and EU, among others, Hetero had earlier said.

The treatment first showed improvement in trials on coronavirus patients and was approved for emergency use in severely ill patients in the United States and South Korea.

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.