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Nanotech can make biopesticides more effective

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Nanotech can make biopesticides more effective

[vc_row][vc_column][vc_column_text]By Sunderarajan Padmanabhan

The use of eco-friendly biocontrol agents as an alternative to chemical pesticides is prevalent in some farming communities. A group of scientists have now shown that it is possible to substantially enhance efficacy of such biocontrol agents by converting them into nanoparticles.

Researchers at the University of Agricultural Sciences at Raichur in Karnataka have developed a new technique to do so. They have converted secretion of a bacterium, Photorhabdusluminescens, into nanoparticles and found that its efficacy improved significantly. The bacterium is used as a biocontrol agent against a wide range of crop pests like mite, aphid, and mealy bug. The nano form of biocontrol agent has been tested against two sucking pests of cotton — Tetranychusmacfarlanei, a species of mite and Aphis gossypii, a species of aphid.

Nanotech can make biopesticides more effective

The fight is on: A mite killed by the new nano-particulated solution.

Reporting their findings in a recent issue of scientific journal Current Science, the researchers noted, “High mortality coupled with quick action emphasises the potential of nanotechnology in enhancing the pathogenicity of a microbial pesticide.” It was found that very low concentration of nano-particulated secretion could kill pests as against unprocessed secretion. This means farmers would be required to use very small quantities of biopesticide in its nano form.

Cellular secretions of the bacterium Photorhabdusluminescens have been used as pesticide against a wide range of insects. The bacterium lives within the body of a nematode called Heterorhabditis in a symbiotic relationship with the nematode. It secretes an array of toxins and enzymes.The secretions have a wide range of insecticidal actions against both sucking and chewing anthropod pests of agricultural crops. Farmers spray solutions of the bacteria on crops but it is not as efficacious as synthetic chemicals.

Scientists converted bacterial secretions into nanoparticles using a multi-stage process involving culturing, centrifuge, ultrasonic assisted atomizing and hot air-assisted vacuum process. The resultant product is dry powder.

“We have proved that it is possible to substantially enhance the efficacy of biopesticides. We need to conduct more studies to figure what is the best form in which it could be delivered to the users: whether it should be as a powder or a solution or in some other form,” said A Prabhuraj, one of the scientists involved in the study.

The research team included Ramesh A Kulkarni, J Ashoka and SG Hanchinal of the Department of Agricultural Entomology and SharanagoudaHiregoudar of the Department of Processing and Food Technology at the Raichur University. (India Science Wire)[/vc_column_text][/vc_column][/vc_row]

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India closely monitoring situation in Iran, urges nationals to leave

India has advised its citizens in Iran to leave the country as authorities closely monitor the deteriorating security situation, with nearly 9,000 Indians currently residing there.

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The Indian government on Friday said it is closely monitoring the evolving security situation in Iran and has advised Indian nationals currently in the country to leave using available means. The Ministry of External Affairs (MEA) stressed that ensuring the safety and well-being of Indian citizens remains a priority.

Speaking during the weekly media briefing in New Delhi, MEA spokesperson Randhir Jaiswal said approximately 9,000 Indians are presently residing in Iran, with students forming the majority of the community. He said the government has issued multiple advisories in response to recent developments.

“In light of the situation, we have advised Indian citizens in India not to travel to Iran at this time, and those currently residing there have been asked to leave the country by whatever means are available,” Jaiswal said.

The spokesperson added that the government is maintaining close vigilance over developments and is prepared to take necessary steps for the welfare of Indian nationals.

Embassy advisories and travel warnings

The Indian Embassy in Tehran has issued an advisory asking Indian citizens — including students, businesspersons, pilgrims and tourists — to depart Iran through available transport options, including commercial flights, citing the evolving security environment.

Separately, the MEA reiterated its advisory urging Indians to avoid travel to Iran until further notice. It also recalled an earlier warning issued on January 5, advising Indian nationals in Iran to remain cautious and refrain from participating in protests or demonstrations.

Indian citizens in Iran have been asked to keep essential travel and identification documents, including passports, readily accessible. Those living in the country on resident visas have also been advised to register with the Indian Embassy.

Protests and regional tensions

The advisories come against the backdrop of nationwide protests in Iran, which began at Tehran’s Grand Bazaar in late December following a sharp fall in the Iranian rial. The demonstrations later spread across the country amid mounting economic challenges, including inflation, unemployment, power outages and water shortages.

Regional tensions have also risen amid international warnings of possible military action if the situation escalates further. These developments have prompted several countries, including India, to review travel advisories and safety measures for their citizens in Iran.

India has maintained long-standing ties with Iran, though officials have indicated that recent international trade-related announcements linked to Tehran are expected to have a limited impact, given the relatively small share of bilateral trade in India’s overall commerce.

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Trump calls it a wonderful gesture as Machado presents him Nobel Peace Prize medal

Donald Trump described it as a “wonderful gesture” after Venezuela’s opposition leader Maria Corina Machado presented him with her Nobel Peace Prize medal during a White House meeting.

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US President Donald Trump has described it as a “wonderful gesture” after Venezuela’s opposition leader Maria Corina Machado presented him with her Nobel Peace Prize medal during a meeting at the White House.

Trump praised Machado publicly after the interaction, saying she had been through “so much” and that the act reflected “mutual respect.” He said the medal was given to him for the work he has done, according to his post on his social media platform.

The gesture, however, has drawn attention as the Nobel Institute has clarified that a Nobel Peace Prize cannot be transferred to another individual.

Nobel Institute rules out transfer of prize

The Nobel Institute has stated that Machado is not permitted to give her Nobel Peace Prize to Trump. Despite this, a White House official confirmed that Trump intends to keep the medal, even if the act remains symbolic.

Trump has long expressed interest in the Nobel Peace Prize, making the episode particularly notable despite the formal limitations placed on such honours.

Political context behind the meeting

Machado had been widely regarded as Venezuela’s democratic leader-in-waiting before Trump’s recent policy decisions regarding the country. Earlier this month, Trump declined to fully back her challenge to Venezuela’s ruling regime and instead signalled openness to engaging with leaders linked to the existing power structure.

Trump has publicly questioned Machado’s ability to lead, saying she lacks sufficient support and respect within Venezuela. Her political party is believed to have won the 2024 elections, results that were rejected by President Nicolas Maduro.

Trump has also indicated a willingness to work with acting President Delcy Rodriguez, who previously served as Maduro’s deputy.

What Machado said after the meeting

Speaking to reporters after leaving the White House and heading to Capitol Hill, Machado said she presented the medal to the US president as recognition of his “unique commitment” to Venezuela’s freedom.

She added that Trump did not provide detailed assurances during their closed-door discussion, including on the issue of elections in Venezuela. No further specifics of the meeting were disclosed.

Afterwards, Machado greeted supporters gathered near the White House gates, hugging several of them. Addressing the crowd, she said they could count on President Trump, prompting brief chants of appreciation from those present.

Machado’s recent public appearance

Before her visit to Washington, Machado had largely stayed out of public view since travelling to Norway last month, where her daughter accepted the Nobel Peace Prize on her behalf. She had spent nearly a year in hiding in Venezuela before appearing at the ceremony.

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US freezes immigrant visa processing for 75 countries, India not in list

The United States suspends immigrant visa processing for 75 countries, excluding temporary visas, as part of stricter immigration measures.

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The United States has indefinitely suspended immigrant visa processing for 75 countries, targeting individuals seeking permanent residency based on nationality. The move, set to take effect on January 21, excludes tourist and temporary work visas, but is expected to have a significant impact on family-based immigration.

Reasons behind the visa freeze

The US State Department said the suspension aims to prevent the entry of foreign nationals likely to require government welfare and public benefits. “The Trump administration is bringing an end to the abuse of America’s immigration system by those who would extract wealth from the American people,” said State Department spokesman Tommy Pigott.

While the administration cites the risk of immigrants draining government resources, studies by the Cato Institute and other research groups suggest immigrants generally use fewer benefits than US-born citizens.

Who will not be affected

Temporary visas for tourists, business travelers, and sports fans remain unaffected. Exceptions are also allowed for individuals with dual nationality, a valid passport from a country not on the list, or travel serving an “America First” national interest. Approved visas that have not yet been printed must be refused according to the State Department.

Countries affected

The visa freeze covers nations across Africa, Asia, Latin America, the Middle East, and Eastern Europe. Some of the most affected countries include Pakistan, Bangladesh, Somalia, Russia, Iran, Afghanistan, Brazil, Nigeria, and Thailand.

Other countries on the full list include Albania, Algeria, Armenia, Azerbaijan, Bahamas, Barbados, Belarus, Belize, Bhutan, Bosnia and Herzegovina, Myanmar, Cambodia, Cameroon, Cape Verde, Colombia, Côte d’Ivoire, Cuba, Democratic Republic of the Congo, Dominica, Egypt, Eritrea, Ethiopia, Fiji, The Gambia, Georgia, Ghana, Grenada, Guatemala, Guinea, Haiti, Iraq, Jamaica, Jordan, Kazakhstan, Kosovo, Kuwait, Kyrgyzstan, Laos, Lebanon, Liberia, Libya, North Macedonia, Moldova, Mongolia, Montenegro, Morocco, Nepal, Nicaragua, Republic of the Congo, Rwanda, St Kitts and Nevis, St Lucia, St Vincent and the Grenadines, Senegal, Sierra Leone, South Sudan, Sudan, Syria, Tanzania, Togo, Tunisia, Uganda, Uruguay, Uzbekistan, and Yemen.

Trump administration immigration record

The Trump administration has already imposed stricter vetting procedures over the past year, revoking over 100,000 visas and deporting more than 605,000 people, with 2.5 million others leaving voluntarily. Critics highlight that the policy disproportionately affects immigrants from non-European countries.

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