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
Senate Bipartisan Vote Moves Measure to Block Further U.S. Military Action in Venezuela
The U.S. Senate took a significant step on Thursday toward limiting President Donald Trump’s military authority in Venezuela, advancing a bipartisan war powers resolution that would block further military actions without explicit congressional approval, lawmakers said.
In a 52-47 procedural vote, the measure moved forward after five Republican senators joined all Democrats in supporting the effort. The resolution aims to require presidential authorization from Congress before the United States can engage in any new hostilities against Venezuela, a rare rebuke of Trump from both sides of the aisle following the controversial military operation that resulted in the capture of Venezuelan leader Nicolás Maduro.
If ultimately passed, the legislation would obligate the administration to withdraw U.S. forces from any imminent hostilities in or against Venezuela unless Congress explicitly authorizes such actions. However, the measure’s future remains uncertain as it heads next to the House of Representatives, where a Republican majority is less likely to approve it, and any final version would likely face a presidential veto. Overriding a veto would require a two-thirds majority in both chambers, a high threshold in the current political landscape.
President Trump has sharply criticized Republican senators who broke ranks to support the resolution, saying they should not be re-elected and arguing that the measure undermines his authority to act in national defense. Nevertheless, the vote signals growing bipartisan concern in Congress about unchecked executive military action in the absence of legislative authorization.
International
Petro and Trump Agree on Joint Action Against ELN Guerrillas After Tense Diplomacy
Colombian President Gustavo Petro and his U.S. counterpart Donald Trump agreed on “joint actions” to combat the National Liberation Army (ELN) guerrilla group operating along the Colombia–Venezuela border, Colombia’s Interior Minister Armando Benedetti said on Thursday.
The announcement came after a period of heightened diplomatic tension triggered by recent U.S. airstrikes in Venezuela, the capture of Venezuelan President Nicolás Maduro, and threats of possible U.S. military action in Colombia. The phone call Wednesday evening was the first direct conversation between Petro and Trump since both leaders took office, and it helped ease the strained relationship.
During the call, both presidents committed to carry out joint efforts against the ELN, a guerrilla group that has repeatedly attacked Colombian security forces and is accused of kidnapping soldiers. In December, the ELN declared a “armed strike,” confining civilians in areas under its control in response to perceived threats of U.S. intervention.
According to Benedetti, Petro welcomed Trump’s invitation to meet in Washington and asked for U.S. support to “strike hard” against ELN positions along the porous border with Venezuela, where guerrillas often flee after clashes with Colombian forces.
The border region is a longstanding flashpoint, where armed groups, drug traffickers and illegal mining networks compete for control. Previous attempts by Petro’s government to negotiate peace with the ELN have stalled after a major offensive in Catatumbo that left hundreds dead and displaced thousands.
International
Lula Vetoes Bill That Would Have Shortened Bolsonaro’s Prison Sentence
Brazilian President Luiz Inácio Lula da Silva vetoed on Thursday a bill that would have significantly reduced the prison sentence of his far-right predecessor, Jair Bolsonaro, who is currently serving time for attempting a coup d’état.
Despite the veto, the conservative-majority Congress retains the power to override the decision through a vote.
In September, following a landmark trial, Brazil’s Supreme Court sentenced Bolsonaro to 27 years in prison after finding him guilty of conspiring to remain in power in an “authoritarian” manner following his defeat to Lula in the 2022 presidential election.
The 70-year-old former president has been incarcerated in a Brasília prison since late November. Earlier this month, the Supreme Court rejected a request for house arrest on health grounds.
Under the current legal framework, Bolsonaro would be required to serve approximately eight years before becoming eligible for sentence leniency. However, a bill passed by Congress in December could have reduced that period to just over two years, prompting Lula’s veto.
Senate Bipartisan Vote Moves Measure to Block Further U.S. Military Action in Venezuela
Petro and Trump Agree on Joint Action Against ELN Guerrillas After Tense Diplomacy
Lula Vetoes Bill That Would Have Shortened Bolsonaro’s Prison Sentence
Tec de Monterrey honors one of its students for his contribution to nanotechnology in medicine
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Extension of the state of emergency approved in southern Chile
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