International
Chilean scientist plans to clean up mining with ‘metal eating’ bacteria
AFP
Starving microorganisms capable of surviving in extreme conditions have already managed to “eat” a nail in just three days.
In Chile, a scientist is testing “metal-eating” bacteria she hopes could help clean up the country’s highly-polluting mining industry.
In her laboratory in Antofagasta, an industrial town 1,100-kilometers north of Santiago, 33-year-old biotechnologist Nadac Reales has been carrying out tests with extremophiles — organisms that live in extreme environments.
Reales came up with her idea while still at university as she was conducting tests at a mining plant using microorganisms to improve the extraction of copper.
“I realized there were various needs in the mining industry, for example what happened with the metallic waste,” she told AFP.
Some metals can be recycled in smelting plants but others, such as HGV truck hoppers that can hold 50 tons of rock, cannot and are often discarded in Chile’s Atacama desert, home to the majority of the country’s mining industry.
Chile is the world’s largest producer of copper, which accounts for up to 15 percent of the country’s GDP, resulting in a lot of mining waste that pollutes the environment.
In her research, Reales, who now runs her own company Rudanac Biotec, concentrated on iron-oxidizing bacteria called Leptospirillum.
She extracted the bacteria from the Tatio geysers located 4,200 meters above sea level, some 350 kilometers from Antofagasta.
The bacteria “live in an acidic environment that is practically unaffected by relatively high concentrations of most metals,” she said.
“At first the bacteria took two months to disintegrate a nail.”
But when starved, they had to adapt and find a way of feeding themselves.
After two years of trials, the result was a marked increase in the speed at which the bacteria “ate,” devouring a nail in just three days.
– Surprising benefit –
Reales says “chemical and microbiological tests” have proved the bacteria are not harmful to humans or the environment.
“We’ve always seen a lot of potential in this project that has already passed an important test in the laboratory,” said Drina Vejar, a microbiologist who is part of a four-person team working with Reales.
“It’s really necessary at this time when we have to plan for a more sustainable development, especially in all these cities with so many polluting industries.”
Mining companies have shown interest in the research but while Rudanac Biotec previously benefitted from a state fund for start-ups, the company needs investment to move on to its next stage of trials.
Reales says she needs money to see if her method will “eat a medium sized beam or a hopper.”
When the disintegration process is complete, what remains is a reddish liquid residue, a solution known as a lixiviant that itself possesses a surprising quality.
“After biodisintegration the product generated (the liquid) can improve the recovery of copper in a process called hydrometallurgy,” said Reales.
Essentially, the liquid residue can be used to extract copper from rock in a more sustainable manner than the current use of chemicals in leaching.
Reales says it means green mining is “totally feasible.”
That is of great interest to mining companies that could use it to improve their large scale extraction of copper or other minerals, while also reducing their pollution, something they are required to do by law.
Reales recently submitted a request for an international patent for her technology, but more importantly she hopes it will help reduce metal waste blotting the landscape in the mining regions of her country.
International
Kristi Noem credits Trump for mass migrant deportations by mexican president
U.S. Secretary of Homeland Security Kristi Noem claimed that Mexican President Claudia Sheinbaum has deported “more than half a million” migrants due to pressure from former President Donald Trump.
During a cabinet meeting highlighting the “achievements” of Trump’s administration in its first 100 days, Noem asserted that under the Republican leader’s influence, “Mexico has finally come to the table” to negotiate on migration and fentanyl trafficking.
“The president of Mexico told me she has returned just over half a million people before they reached our border,” Noem stated, criticizing media reports that suggest the Biden administration deported more migrants than Trump’s.
“I wish those deportations were counted,” Noem added, “because those people never made it to our border—she sent them back because you made her.” She went on to thank Trump: “They never made it here because they got the message—because you were so aggressive.”
Noem has made controversial claims about Sheinbaum in the past, prompting the Mexican leader to refute them.
On April 1, Sheinbaum responded to one such statement by declaring, “The president answers to only one authority, and that is the people of Mexico,” after Noem said on Fox News that she gave Sheinbaum “a list of things Trump would like to see” and that Mexico’s actions would determine whether Trump granted tariff relief.
International
Vatican releases special “Sede Vacante” stamps ahead of papal transition
he Vatican’s post offices and select collector shops began selling special edition stamps this week to mark the period between the death of Pope Francis and the election of his successor.
Known as “Sede Vacante” stamps, they feature an image used on official Vatican documents during the interregnum between popes — two crossed keys without the papal tiara. These stamps went on sale Monday and will remain valid for postal use only until the new pontiff appears at the window overlooking St. Peter’s Square.
Until then, they can be used to send letters, postcards, and parcels. “Once the new pope is elected, the stamps lose their postal validity, but their collectible value rises,” said Francesco Santarossa, who runs a collectors’ shop across from St. Peter’s Square.
The Vatican has issued the stamps in four denominations: €1.25, €1.30, €2.45, and €3.20. Each is inscribed with “Città del Vaticano” and “Sede Vacante MMXXV” — Latin for “Vacant See 2025.”
International
Conclave to choose pope Francis’ successor could begin in early may
The conclave, which in the coming weeks must choose the successor to Pope Francis, will strictly follow a precise protocol refined over centuries.
The 135 cardinal electors, all under the age of 80, will cast their votes four times a day — except on the first day — until one candidate secures a two-thirds majority. The result will be announced to the world through the burning of the ballots with a chemical that produces the eagerly awaited white smoke, accompanied by the traditional cry of “Habemus Papam.”
The start date for the conclave could be announced today, as the cardinals are set to hold their fifth meeting since the pope’s passing. Luxembourg Cardinal Jean-Claude Hollerich suggested it could begin on May 5 or 6, following the traditional nine days of mourning. According to German Cardinal Reinhard Marx, the conclave could last only “a few days.”
Although the late Argentine pontiff appointed the majority of the cardinal electors, this does not necessarily ensure the selection of a like-minded successor. Francis’ leadership style differed significantly from that of his predecessor, Benedict XVI, a German theologian who was less fond of large public gatherings. It also marked a contrast with the popular Polish pope, John Paul II.
The Argentine Jesuit’s reformist papacy drew strong criticism from more conservative sectors of the Church, who are hoping for a doctrinally focused shift. His tenure was marked by efforts to combat clerical sexual abuse, elevate the role of women and laypeople, and advocate for the poor and migrants, among other causes.
Kristi Noem credits Trump for mass migrant deportations by mexican president
Vatican releases special “Sede Vacante” stamps ahead of papal transition
Conclave to choose pope Francis’ successor could begin in early may
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