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Photosynthesis is one of the most important chemical processes on Earth. (Image credit: Shutterstock)

One of the most well-studied chemical processes in nature, photosynthesis, may not work quite how we thought it did, scientists have accidentally discovered.

Photosynthesis is the process by which plants, algae and some bacteria convert carbon dioxide and water into oxygen and sugars to use as energy. To do this, the organisms use sunlight to oxidize, or take electrons from, water; and reduce, or give electrons to, carbon dioxide molecules. These chemical reactions require photosystems — protein complexes that contain chlorophyll, a pigment that absorbs light and gives plant leaves and algae their green color — to transfer electrons between different molecules.

In the new study, published March 22 in the journal Nature (opens in new tab) , researchers used a new technique, known as ultrafast transient absorption spectroscopy, to study how photosynthesis works at a timescale of one quadrillionth of a second (0.000000000000001 second) for the first time. The team was initially trying to figure out how quinones — ring-shaped molecules that can steal electrons during chemical processes — impact photosynthesis. But instead, the researchers found that electrons could be released from photosystems much earlier during photosynthesis than scientists previously believed was possible.

“We thought we were just using a new technique to confirm what we already knew,” study co-author Jenny Zhang (opens in new tab) , a biochemist specializing in photosynthesis at the University of Cambridge in England, said in a statement (opens in new tab) . “Instead, we found a whole new pathway, and opened the black box of photosynthesis a bit further.”

Related: New ‘artificial’ photosynthesis is 10x more efficient than previous attempts 

Photosynthetic algae viewed under the microscope. Their green color is the result of the pigment chlorophyll found inside photosystems. (Image credit: Shutterstock)

Two photosystems are used during photosynthesis: photosystem I (PSI) and photosystem II (PSII). PSII primarily provide electrons to PSI by taking them from water molecules: PSI then further excites the electrons before releasing them to eventually be given to carbon dioxide to create sugars, via a series of complex steps. 

Past research had suggested that the protein scaffolding in PSI and PSII was very thick, which helped to contain electrons within them before being passed on to where they were needed. But the new ultrafast spectroscopy technique revealed that the protein scaffolding was more “leaky” than expected and that some electrons could escape from the photosystems almost immediately after light was absorbed by the chlorophyll within the photosystems. These electrons could therefore reach their destinations faster than expected.

“The new electron transfer pathway we found here is completely surprising,” Zhang said. “We didn’t know as much about photosynthesis as we thought we did.”

The electron leaking was observed in both isolated photosystems and within “living” photosystems inside cyanobacteria.RELATED STORIES—Plant leaves spark with electricity during thunderstorms — and that could be altering our air quality in unpredictable ways

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In addition to rewriting what we know about photosynthesis, the discovery opens up new avenues for future research and biotechnology applications. The team believes that by “hacking” photosynthesis to release more of these electrons at earlier stages, the process could become much more efficient, which could help produce plants that are more resistant to sunlight or be replicated artificially to create renewable energy sources to help combat climate change, according to the statement. However, much more research is needed before this can happen.

“Many scientists have tried to extract electrons from an earlier point in photosynthesis, but said it wasn’t possible because the energy is so buried in the protein scaffold,” Zhang said. “The fact that we can [potentially] steal them at an earlier process is mind-blowing.”

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Business

Sir Keir Starmer pledges to protect UK companies from Trump tariff ‘storm’

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Sir Keir Starmer pledges to protect UK companies from Trump tariff 'storm'

Sir Keir Starmer has said his government stands ready to use industrial policy to “shelter British business from the storm” after Donald Trump’s new 10% tariff kicked in.

The UK was among a number of countries hit with the lowest import duty rate following the president’s announcement on 2 April – which he called ‘Liberation Day’, while other nations, such as Vietnam, Cambodia and China face much higher US levies.

But a global trade war will hurt the UK’s open economy.

The prime minister said “these new times demand a new mentality”, after the 10% tax on British imports into America came into force on Saturday. A 25% US levy on all foreign car imports was introduced on Thursday.

It comes as Jaguar Land Rover announced it would “pause” shipments to the US for a month, as firms grapple with the new taxes.

On Saturday, the car manufacturer said it was working to “address the new trading terms” and was looking to “develop our mid to longer-term plans”.

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Jobs fears as Jaguar halts shipments

Referring to the tariffs, Sir Keir said “the immediate priority is to keep calm and fight for the best deal”.

Writing in The Sunday Telegraph, he said that in the coming days “we will turbocharge plans that will improve our domestic competitiveness”, adding: “We stand ready to use industrial policy to help shelter British business from the storm.”

It is believed a number of announcements could be made soon as ministers look to encourage growth.

NI contribution rate for employers goes up

From Sunday, the rate of employer NICs (national insurance contributions) increased from 13.8% to 15%.

At the same time, firms will also pay more because the government lowered the salary threshold at which companies start paying NICs from £9,100 to £5,000.

Also, the FTSE 100 of leading UK companies had its worst day of trading since the start of the pandemic on Friday, with banks among some of the firms to suffer the sharpest losses.

Sir Keir said: “This week, the government will do everything necessary to protect Britain’s national interest. Because when global economic sands are shifting, our laser focus on delivering for Britain will not. And these new times demand a new mentality.”

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Trump defiant despite markets

UK spared highest tariff rates

Some of the highest rates have been applied to “worst offender” countries including some in Southeast Asia. Imports from Cambodia will be subject to a 49% tariff, while those from Vietnam will face a 46% rate. Chinese goods will be hit with a 34% tariff.

Imports from France will have a 20% tariff, the rate which has been set for European Union nations. These will come into effect on 9 April.

Read more:
Red wall on Wall Street – but Trump undeterred
How will UK respond to Trump’s tariffs?

Sir Keir has been speaking to foreign leaders on the phone over the weekend, including French President Emmanuel Macron, Italian Prime Minister Giorgia Meloni and Australian Prime Minister Anthony Albanese, to discuss the tariff changes.

A Downing Street spokesperson said of the conversation between Sir Keir and Mr Macron: “They agreed that a trade war was in nobody’s interests but nothing should be off the table and that it was important to keep business updated on developments.

“The prime minister and president also shared their concerns about the global economic and security impact, particularly in Southeast Asia.”

👉 Follow Trump 100 on your podcast app 👈

Trump’s warning

Mr Trump has warned Americans the tariffs “won’t be easy”, but urged them to “hang tough”.

In a post on his Truth Social platform, he said: “We are bringing back jobs and businesses like never before.

“Already, more than FIVE TRILLION DOLLARS OF INVESTMENT, and rising fast!

“THIS IS AN ECONOMIC REVOLUTION, AND WE WILL WIN. HANG TOUGH, it won’t be easy, but the end result will be historic.”

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Politics

Sir Keir Starmer pledges to protect UK companies from Trump tariff ‘storm’

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on

By

Sir Keir Starmer pledges to protect UK companies from Trump tariff 'storm'

Sir Keir Starmer has said his government stands ready to use industrial policy to “shelter British business from the storm” after Donald Trump’s new 10% tariff kicked in.

The UK was among a number of countries hit with the lowest import duty rate following the president’s announcement on 2 April – which he called ‘Liberation Day’, while other nations, such as Vietnam, Cambodia and China face much higher US levies.

But a global trade war will hurt the UK’s open economy.

The prime minister said “these new times demand a new mentality”, after the 10% tax on British imports into America came into force on Saturday. A 25% US levy on all foreign car imports was introduced on Thursday.

It comes as Jaguar Land Rover announced it would “pause” shipments to the US for a month, as firms grapple with the new taxes.

On Saturday, the car manufacturer said it was working to “address the new trading terms” and was looking to “develop our mid to longer-term plans”.

Please use Chrome browser for a more accessible video player

Jobs fears as Jaguar halts shipments

Referring to the tariffs, Sir Keir said “the immediate priority is to keep calm and fight for the best deal”.

Writing in The Sunday Telegraph, he said that in the coming days “we will turbocharge plans that will improve our domestic competitiveness”, adding: “We stand ready to use industrial policy to help shelter British business from the storm.”

It is believed a number of announcements could be made soon as ministers look to encourage growth.

NI contribution rate for employers goes up

From Sunday, the rate of employer NICs (national insurance contributions) increased from 13.8% to 15%.

At the same time, firms will also pay more because the government lowered the salary threshold at which companies start paying NICs from £9,100 to £5,000.

Also, the FTSE 100 of leading UK companies had its worst day of trading since the start of the pandemic on Friday, with banks among some of the firms to suffer the sharpest losses.

Sir Keir said: “This week, the government will do everything necessary to protect Britain’s national interest. Because when global economic sands are shifting, our laser focus on delivering for Britain will not. And these new times demand a new mentality.”

Please use Chrome browser for a more accessible video player

Trump defiant despite markets

UK spared highest tariff rates

Some of the highest rates have been applied to “worst offender” countries including some in Southeast Asia. Imports from Cambodia will be subject to a 49% tariff, while those from Vietnam will face a 46% rate. Chinese goods will be hit with a 34% tariff.

Imports from France will have a 20% tariff, the rate which has been set for European Union nations. These will come into effect on 9 April.

Read more:
Red wall on Wall Street – but Trump undeterred
How will UK respond to Trump’s tariffs?

Sir Keir has been speaking to foreign leaders on the phone over the weekend, including French President Emmanuel Macron, Italian Prime Minister Giorgia Meloni and Australian Prime Minister Anthony Albanese, to discuss the tariff changes.

A Downing Street spokesperson said of the conversation between Sir Keir and Mr Macron: “They agreed that a trade war was in nobody’s interests but nothing should be off the table and that it was important to keep business updated on developments.

“The prime minister and president also shared their concerns about the global economic and security impact, particularly in Southeast Asia.”

👉 Follow Trump 100 on your podcast app 👈

Trump’s warning

Mr Trump has warned Americans the tariffs “won’t be easy”, but urged them to “hang tough”.

In a post on his Truth Social platform, he said: “We are bringing back jobs and businesses like never before.

“Already, more than FIVE TRILLION DOLLARS OF INVESTMENT, and rising fast!

“THIS IS AN ECONOMIC REVOLUTION, AND WE WILL WIN. HANG TOUGH, it won’t be easy, but the end result will be historic.”

Continue Reading

World

IDF says it mistakenly identified Gaza aid workers as threat – after video of deadly attack emerges

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IDF says it mistakenly identified Gaza aid workers as threat - after video of deadly attack emerges

The IDF says it mistakenly identified a convoy of aid workers as a threat – following the emergence of a video which proved their ambulances were clearly marked when Israeli troops opened fire on them.

The bodies of 15 aid workers – including eight medics working for the Palestine Red Crescent Society (PRCS) – were found in a “mass grave” after the incident, according to the head of the UN Office for Coordination of Humanitarian Affairs Jonathan Whittall.

The Israeli military originally claimed an investigation found the vehicles did not have any headlights or emergency signals and were therefore targeted as they looked “suspicious”.

But video footage obtained by the PRCS, and verified by Sky News, showed the ambulances and a fire vehicle clearly marked with flashing red lights.

In a briefing from the IDF, it said the ambulances arrived in the Tel Sultan neighbourhood in Rafah shortly after a Hamas police vehicle drove through.

Palestinians mourn medics, who came under Israeli fire while on a rescue mission, after their bodies were recovered, according to the Red Crescent, at Nasser hospital in Khan Younis in the southern Gaza Strip March 31, 2025. REUTERS/Hatem Khaled/File Photo
Image:
Palestinians mourning the medics after their bodies were recovered. Pic: Reuters

An IDF surveillance aircraft was watching the movement of the ambulances and notified troops on the ground. The IDF said it will not be releasing that footage.

When the ambulances arrived, the soldiers opened fire, thinking the medics were a threat, according to the IDF.

The soldiers were surprised by the convoy stopping on the road and several people getting out quickly and running, the IDF claimed, adding the soldiers were unaware the suspects were in fact unarmed medics.

An Israeli military official would not say how far away troops were when they fired on the vehicles.

The IDF acknowledged that its statement claiming that the ambulances had their lights off was incorrect, and was based on the testimony from the soldiers in the incident.

The newly emerged video footage showed that the ambulances were clearly identifiable and had their lights on, the IDF said.

The IDF added that there will be a re-investigation to look into this discrepancy.

Analysis: Video undermines Israel’s account of aid worker deaths

The clip is filmed through a vehicle windscreen - with three red light vehicles visible in front
Image:
The clip is filmed through a vehicle windscreen – with three red light vehicles visible in front

Addressing the fact the aid workers’ bodies were buried in a mass grave, the IDF said in its briefing this is an approved and regular practice to prevent wild dogs and other animals from eating the corpses.

The IDF could not explain why the ambulances were also buried.

The IDF said six of the 15 people killed were linked to Hamas, but revealed no detail to support the claim.

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Bodies of aid workers found in Gaza

The newly emerged footage of the incident was discovered on a phone belonging to one of the workers who was killed, PRCS president Dr Younis Al Khatib said.

“His phone was found with his body and he recorded the whole event,” he said. “His last words before being shot, ‘Forgive me, mom. I just wanted to help people. I wanted to save lives’.”

Sky News used an aftermath video and satellite imagery to verify the location and timing of the newly emerged footage of the incident.

More from Sky News:
Israeli troops expand Gaza ‘security zone’
What happened to the ceasefire?

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Aid worker attacks increasing

It was filmed on 23 March north of Rafah and shows a convoy of marked ambulances and a fire-fighting vehicle travelling south along a road towards the city centre. All the vehicles visible in the convoy have their flashing lights on.

The footage was filmed early in the morning, with a satellite image seen by Sky News taken at 9.48am local time on the same day showing a group of vehicles bunched together off the road.

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