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
U.S. and Mexico Reach Deal to Address Water Deficit Under 1944 Treaty
The United States and Mexico have reached an agreement to comply with current water obligations affecting U.S. farmers and ranchers and for Mexico to cover its water deficit to Texas under the 1944 Water Treaty, the U.S. Department of Agriculture said in a statement.
The department уточified that the agreement applies to both the current cycle and the water deficit from the previous cycle.
On Monday, U.S. President Donald Trump accused Mexico of failing to comply with the water-sharing treaty between the two countries, which requires the United States to deliver 1.85 billion cubic meters of water from the Colorado River, while Mexico must supply 432 million cubic meters from the Rio Grande.
Mexico is behind on its commitments. According to Washington, the country has accumulated a deficit of more than one billion cubic meters of water over the past five years.
“This violation is severely harming our beautiful crops and our livestock in Texas,” Trump wrote on Monday.
The Department of Agriculture said on Friday that Mexico had agreed to supply 250 million cubic meters of water starting next week and to work toward closing the shortfall.
Agriculture Secretary Brooke Rollins, quoted in the statement, said Mexico delivered more water in a single year than it had over the previous four years combined.
Trump has said that if Mexico continues to fall short of its obligations, the United States reserves the right to impose 5% tariffs on imported Mexican products.
Mexico’s Deputy Foreign Minister for North America, Roberto Velasco, said that a severe drought in 2022 and 2023prevented the country from meeting its commitments.
International
Several people shot in attack on Brown University campus
Several people were shot on Saturday in an attack on the campus of Brown University, in the northeastern United States, local police reported.
“Shelter in place and avoid the area until further notice,” the Providence Police Department urged in a post on X. Brown University is located in Providence, the capital of the state of Rhode Island.
U.S. President Donald Trump said on his social media platform Truth Social that he had been briefed on the situation and that the FBI was on the scene.
At 5:52 p.m. local time (11:52 p.m. GMT), Brown University said the situation was still “ongoing” and instructed students to remain sheltered until further notice.
After initially stating that the suspect had been taken into custody, Trump later posted a second message clarifying that local police had walked back that information. “The suspect has NOT been apprehended,” the U.S. president said.
International
Colombia says it would not reject Maduro asylum request as regional tensions escalate
The Colombian government stated on Thursday that it would have no reason to reject a potential asylum request from Venezuelan President Nicolás Maduro should he leave office, as regional tensions persist over the deployment of U.S. military forces in the Caribbean since August.
“In the current climate of tension, negotiations are necessary, and if the United States demands a transition or political change, that is something to be assessed. If such a transition results in him (Maduro) needing to live elsewhere or seek protection, Colombia would have no reason to deny it,” said Colombian Foreign Minister Rosa Villavicencio in an interview with Caracol Radio.
However, Villavicencio noted that it is unlikely Maduro would choose Colombia as a refuge. “I believe he would opt for someplace more distant and calmer,” she added.
Colombian President Gustavo Petro also commented on Venezuela’s situation on Wednesday, arguing that the country needs a “democratic revolution” rather than “inefficient repression.” His remarks followed the recent detention and passport cancellation of Cardinal Baltazar Porras at the Caracas airport.
“The Maduro government must understand that responding to external aggression requires more than military preparations; it requires a democratic revolution. A country is defended with more democracy, not more inefficient repression,” Petro wrote on X (formerly Twitter), in a rare public criticism of the Venezuelan leader.
Petro also called for a general amnesty for political opponents and reiterated his call for forming a broad transitional government to address Venezuela’s prolonged crisis.
Since September, U.S. military forces have destroyed more than 20 vessels allegedly carrying drugs in Caribbean and Pacific waters near Venezuela and Colombia, resulting in over 80 deaths.
U.S. President Donald Trump has repeatedly warned that attacks “inside Venezuela” will begin “soon,” while Maduro has urged Venezuelans to prepare for what he describes as an impending external aggression.
U.S. and Mexico Reach Deal to Address Water Deficit Under 1944 Treaty
Several people shot in attack on Brown University campus
Colombia says it would not reject Maduro asylum request as regional tensions escalate
Tec de Monterrey honors one of its students for his contribution to nanotechnology in medicine
Defense Minister commends salvadoran soldier for Central American Cross Country victory
Extension of the state of emergency approved in southern Chile
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