Archive for May, 2012

Meet the paralysed woman who commandeered a robotic arm

By Ed Yong | May 18, 2012 9:00 am

Cathy Hutchinson has been trapped in her frozen body for 14 years, after a stroke disconnected her brain from her spinal column. Recently, however, she commanded a robot arm to bring a thermos of coffee to her lips. This story has been all over the news, but for the ultimate telling of the tale, you need to read Jessica Benko’s amazing story over at The Atavist.

I reviewed it for Download the Universe – a review site for science e-books, where a bunch of us writer types are having tremendous fun writing about writing for the sheer joy of it. A sample of the review follows to whet your appetite. Go buy the e-book. You can thank me later. And do read the review too.

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CATEGORIZED UNDER: Uncategorized

Deep-sea bacteria redefine life in the slow lane

By Ed Yong | May 17, 2012 2:05 pm

Your laziest days are positively frenetic compared to the lifestyle of some deep-sea bacteria, buried in the sediments of the Pacific Ocean. These microbes are pushing a slow-going lifestyle to an extreme. They subsist on vanishingly low levels of oxygen, in sediments that have not received any new food sources since the time of the dinosaurs. And yes, they survive.

Not only that, but these microbes could make up 90 per cent of those on the planet. “We’re looking at the most common forms of life on this planet, and we know almost nothing about them,” said Hans Røy, who has been studying them for many years. Now, Røy has finally measured just how slow their metabolism really is.

I’ve written about this discovery for The Scientist, so head over there for the full story.

Image by Shelly Carpenter, NOAA Ocean Explorer

CATEGORIZED UNDER: Bacteria

As oxygen filled the world, life’s universal clock began to tick

By Ed Yong | May 16, 2012 1:00 pm

The Earth’s earliest days were largely free of oxygen. Then, around 2.5 billion years ago, primitive bacteria started to flood the atmosphere with this vital gas. They produced it in the process of harnessing the sun’s energy to make their own nutrients, just as plants do today. The building oxygen levels reddened the planet, as black iron minerals oxidised into rusty hues. They also killed off most of the world’s microbes, which were unable to cope with this new destructive gas. And in the survivors of this planetary upheaval, life’s first clock began to tick and tock.

Today, all life on Earth runs on internal clocks. These ‘circadian rhythms’ are the reason we feel sleepy at night, and why our hormones, temperature and hunger levels rise and fall with a 24-hour cycle. They’re molecular metronomes that keep the events inside our bodies ticking in time with the world around us.

Until now, it seemed that the major branches of the tree of life each had their own timekeeping systems, evolved independently of the others. But Akhilesh Reddy and John O’Neill from the University of Cambridge have disproved that idea, by finding a universal clock that ticks in all kingdoms of life. “It’s exciting because it shows that circadian rhythms are likely as primitive as life on Earth,” says Erik Herzog from Washington University.

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CATEGORIZED UNDER: Evolution, Molecular biology

My new story on psychology’s problem with replications

By Ed Yong | May 16, 2012 12:23 pm

I have a new feature out in Nature looking at two big problems within the field of psychology. First, the field is almost entirely dominated by positive results, while negative ones languish unpublished in personal file drawers. Second, there are few incentives to replicate old results and negative replication attempts face a lengthy gauntlet of obstacles. In the story, I look at why these problems exist and why some psychologists are starting to take them very seriously.

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CATEGORIZED UNDER: Neuroscience and psychology

Sleeper viruses explain why HIV evolves more slowly between people than within them

By Ed Yong | May 15, 2012 7:00 pm

HIV – the virus behind AIDS – is the most diverse of all viruses. Once it infects someone new, it mutates so rapidly that it can spawn a million genetically different strains in just a few months. This evolutionary onslaught overwhelms the host’s immune system, and creates big problems for any scientist trying to create a cure or a vaccine. By evolving so quickly, HIV turns itself into a million moving targets.

But when HIV jumps from one individual to another, something odd happens. The virus still mutates at a breakneck speed, but it does so 2 to 6 times more slowly than within any single person. Unexpectedly, the virus seems to evolve faster in a single host, than in a population.

There are three possible explanations for this puzzling trend, but Katrina Lythgoe and Christophe Fraser from Imperial College London think that only one is correct. They think that the ancestral strain – the one that kicked off someone’s infection – is more likely to spread to other people than its millions of descendants.

The progeny of the ancestral virus quickly evolve to avoid their host’s immune system and reproduce as rapidly as possible. But Lythgoe describes this as “short-sighted evolution”. As the viruses become better at growing within someone, they lose the ability to spread between people. “What is good for the virus in the short term (growing in a host) is not necessarily what is good in the long term (infecting the most people),” says Lythgoe.

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CATEGORIZED UNDER: Evolution, Medicine & health, Viruses

Jurassic bends – the rise of fast predators bubbled the blood of prehistoric reptiles

By Ed Yong | May 15, 2012 9:00 am

Experienced divers know that rising too quickly can be a fatal mistake. The changing pressure yanks previously dissolved gases out of one’s blood and forms tiny bubbles, like the fizz in a newly opened can of soda. Depending on where they emerge, the bubbles can cause everything from a rash (the skin) to seizures (the brain). To avoid this condition, known as decompression sickness or “the bends”, divers rise slowly.

Then again, if you’re being chased by a gigantic prehistoric shark, you may have no choice.

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CATEGORIZED UNDER: Palaeontology

Ready, set, trial: why pandemics catch us out and how to prepare for them

By Ed Yong | May 14, 2012 9:00 am

When we think about preparing for pandemics, we think about vaccines, stockpiles of drugs, and surveillance. We rarely think about research. This oversight means that when big epidemics hit, like the swine flu pandemic of 2009, scientists lose valuable chances to find more about these illnesses. A new consortium is out to change that. I wrote about their work, and the problem of slow clinical research in a new feature for the BMJ, which I’m reprinting here.

 *****

While viruses are fast and adaptable, clinical research is lumbering and cumbersome. Epidemics tend to arrive with little warning, spread quickly, and end abruptly. By contrast, clinical trials can take months to plan. Forms must be designed to record the right data and ethical approval must be sought. By the time would-be researchers can vault over these obstacles the epidemic is history.

This explains why, during the 2009 A/H1N1 influenza pandemic, virtually no patients were enrolled in a randomised controlled trial designed to identify the best ways of treating the infection. Such trials are the gold standard of medicine and the best way of getting rigorous evidence for a treatment’s effectiveness. During the pandemic millions of people were treated with the front line drug oseltamivir (Tamiflu). But the only evidence that oseltamivir actually saved lives came from retrospective observational studies, with all the biases they entail. To this date, serious questions remain about the drug’s effectiveness. “A Tamiflu trial during the last pandemic would have resolved all the controversy over whether it works or not,” says Mike Clarke, Director of the UK Cochrane Centre. In the UK people could request doses of the drug through an NHS hotline. “On the first day of that system, 5000 people received Tamiflu. On that day alone, you could have conducted the biggest trial in the world ever,” says Carl Heneghan from the University of Oxford.Tamiflu’s relatives, zanamivir and peramivir, are similarly mysterious. Are they actually effective against the pandemic strain? What are their ideal doses? Should a high loading dose be used at the start of treatment? Can they be used in combination? Are they suitable for the groups who seem to experience the most severe infections, such as obese people, pregnant women, infants, or those with other diseases? We do not know the answers to these questions, and our ignorance is all the more galling because the virus infected between 11 and 21% of the world’s population.

The same questions dog the many other treatments that doctors turned to during the pandemic, such as steroid hormones, immunoglobulin antibodies, and transfusions of plasma from patients who had fought off the virus. Several thousand patients had such severe problems with their hearts and lungs that doctors had to divert their blood out of their bodies and perfuse it with oxygen by machine—a last ditch treatment known as extracorporeal membrane oxygenation. Each measure has at least one report claiming that it is effective, but these reports are always based on small non-randomised studies. Randomised controlled trials were nowhere to be seen.

“Disgrace is too strong a word, but it’s a shame that we don’t know the answers to these questions after this disease has been through not just poor countries but ours,” says Jeremy Farrar, professor of tropical medicine at Oxford University, who studies infectious diseases in Vietnam. “So much of the world’s population saw this virus.”

These problems are not restricted to pandemic flu: the same barriers have held back our knowledge of other infections. If severe acute respiratory syndrome (SARS) sprang up today, doctors would still ask questions about whether to give patients steroids, immunoglobulins, or ribavirin. And with the sluggish speed of clinical research, they would neither have the answers, nor be in a position to get them. “Let’s say they announce cases of SARS in Vietnam today,” says Piero Olliaro from the World Health Organization, “can we start doing a study? No. Our response is very poor.”

“We don’t ever make the progress we should,” says Farrar. “If a patient comes in tonight with Nipah virus, we can’t look at research done five years ago and say, ‘Look, we should treat this individual in this way.’ Those people would be subject to all sorts of bizarre treatments and we don’t know if they’d work or not.”

Some scientists have had enough. Farrar and others have joined forces to create a global alliance called the International Severe Acute Respiratory Infection Consortium (ISARIC), which will ensure that scientists can carry out effective clinical research during future epidemics. Formally announced in December 2011, ISARIC already includes between 50 and 60 research networks across six continents, and it is still growing. Its supporters include a who’s who of big medical funding agencies: the Wellcome Trust, the UK Medical Research Council, the Bill and Melinda Gates Foundation, Institut National de la Santé et de la Recherche Médicale (Inserm), the Li Ka Shing–University of Oxford Global Health Programme, and the Singapore Ministry of Health.

ISARIC’s goal is to set up relationships, protocols, and strategies during this peacetime period, so that researchers can hit the ground running when the next major infection emerges. When people talk about preparing for epidemics they usually refer to monitoring potential threats or stockpiling drugs and vaccines. ISARIC will deal with the crucial missing element: it will prepare to study epidemics as they happen. Everything from personnel to ethical approval will be readied beforehand, so that when the time comes research can progress at the pace of the virus.

Perhaps the most striking aspect of ISARIC is that it is only now being set up. The last pandemic was preceded by decades of concern about flu, but the preparation focused on epidemiology, modelling, and public health approaches. There was plenty of time to prepare ready made trials, but none was set up. Heneghan thinks that this complacency was partly driven by an inflated sense of certainty about treatments, despite a weak evidence base. “Some people still think we should just use existing treatments when we have influenza, and that’s just what we do,” he says.

“Some people just don’t think into the future enough,” says Clarke. “It’s very surprising that we haven’t got off the shelf trials for major incidents that you know are going to happen.” Farrar adds, “I think nobody thought of [doing this]. If they did, they probably concluded that funding agencies would not fund something that was designed for an uncommon event that would occur at [an] unpredictable time in the future.”

If such reticence once existed this is now changing. In the UK, the National Institute for Health Research (NIHR) put out a call for research proposals in the spring of 2009, as the pandemic was emerging. Despite a fast turnaround, those studies only started after the main waves of infection had passed. Fast was not fast enough. So in October 2011 the NIHR agreed to fund eight projects, including several clinical studies, which will be activated if another pandemic reaches the UK. Steve Goodacre from the University of Sheffield, who chaired the meeting that funded these proposals , says, “You’d get ethics and regulatory approval, pilot the project, develop data collection forms, set up everything ready to go, and put it on hold until a pandemic happened.” At that point full funding would be released, and the pre-cocked starting pistol would fire. Clarke is involved with one of the funded trials, which will assess the use of low dose steroids as treatments for pandemic flu. “It’s ready to go when someone says start,” he says. “The UK may be ahead of the game here.”

ISARIC, which is collaborating with many of the investigators funded by the NIHR, will extend the same principles worldwide. Its first seeds were planted in November 2010, three months after the H1N1 pandemic had officially come to an end. In its aftermath several biomedical funding organisations, including the Bill and Melinda Gates Foundation, the Wellcome Trust, Institut Pasteur, and the National Institute of Allergy and Infectious Diseases, gathered in Bethesda, Maryland to discuss gaps in research on influenza and other respiratory diseases. The problem of slow research response stood out.

The Wellcome Trust followed up with a meeting to discuss the problem in February 2011. Representatives from 20 clinical networks gathered in London, along with funding agencies, and public health workers from WHO, the US Centers for Disease Control and Prevention (CDC), and more. They all recognised the same problem and agreed to work together to solve it. “There was a dramatic, enthusiastic endorsement,” recalls Fred Hayden from the Wellcome Trust. “There was a lot of commitment even then.” ISARIC was born.

The consortium has since grown in size, and there are currently no restrictions as to the number of networks that can join. ISARIC has won two years of funding, amounting to around £500<thin>000, to set their ambitious plans in motion. But, despite the enthusiasm around the consortium, its members recognise that speeding up the pace of clinical research is a significant challenge.

Even the simple business of recording a patient’s details becomes tricky. You need to decide how to diagnose someone as a case so that you end up with the right sample. You need to work out the criteria on which to include or exclude a patient from a trial. You must decide what research questions to ask so that you know what information to record. Creating these case record forms already takes a lot of time, and there’s more still to be done.

Once a research plan has been nailed down it can take months to get funding and ethical approval, at a time when responses are needed in hours and days. For example, in one review of cancer trials it took an average of 621 days to recruit the first patient after funding had been agreed. The recent H1N1 pandemic came and went in less time. “That might be okay for hypertension or diabetes in a developing country, but for a rapidly developing problem, we have to concertina that,” says Farrar.

In ISARIC’s vision clinicians would develop these research protocols ahead of time and secure ethical and administrative approval. When a crisis hits, these plans could be fed through a fast tracked system that allows research to start immediately. Farrar likens this system to the rapid response approaches already used by public health authorities. “If there was an outbreak of salmonella in America tomorrow, there’ll be a really good, well-organised response from the CDC,” he says. “They won’t spend six months discussing a protocol and putting together a case record form. They go to a shelf and take off how they investigated it the last time.”

Researchers also need to work from the same playbook, even if they hail from different regions or countries. If everyone records the same data then local information becomes globally useful. “In an outbreak, you may only be able to study 20 patients in Vietnam, 30 patients in China, and 30 in Africa,” says Farrar. “We need to make sure that we standardise these things so that ultimately, we can bring all of that research together.” As the infections spread data would accumulate.

To ISARIC’s researchers, it is crucial that such data be stored in a freely available repository. The open access movement has been very successful in promoting free access to the end results of research, such as data and publications. But Farrar says that the same principles should apply to the materials that make research possible in the first place. “If you faced an outbreak of encephalitis in Outer Mongolia, you could go to an open access website and say, ‘This group in Vietnam have done lots of studies on encephalitis, and here are their case record form, inclusion criteria, and consent sheet.’ That might save you months of effort.”

People also have to be ready for the chaos that epidemics sow. “Things become significantly more difficult,” says Olliaro. “There’s disruption, panic, and a lot of media attention.” Clinics are flooded with patients, and clinicians face extra burdens on top of their already busy schedules. They barely have time to do regular work, much less carry out additional research. As the epidemic continues clinicians could fall ill themselves, compounding any shortness of staff. If clinics are to cope they need specialists who are trained to carry out research in the event of an epidemic. “You need an intervention squad,” says Olliaro. “They’re ready to go but don’t know when they’ll be called upon. In the mean time, they’re doing routine hospital work.”

Such systems would be impossible to create in the middle of a crisis: they need to be put in place in the breathing space between epidemics. For ISARIC, this does not mean just making plans and forms, but creating trust and connections between its international members. Hayden recalls that during the London meeting when the idea for a consortium was first mooted, “a lot of these groups didn’t even know what each other were doing.” Farrar says, “Ultimately, what drives science is still relationships. The time to build trust is now, outside of the pandemic setting. Then, when you have a crisis, you can be on the phone to someone in Indonesia and they trust you because you’ve worked together and you didn’t steal their samples.”

With their initial burst of funding, the ISARIC members have set up a secretariat and four working groups to advance their agenda. The first working group is tasked with designing clinical trials that can begin now, but that can also adapt and continue in the event of an epidemic. The second group will collect and standardise the clinical data we already have on H1N1 and other emerging infections. The third will develop protocols for studying the basic biology of infections with epidemic potential, such as how they affect their hosts, what makes some people more susceptible than others, and how they might react to known drugs. The fourth group will map all the barriers to a rapid clinical response, and create an open access hub that is loaded with pre-approved plans and documents to be deployed in a crisis.

Within the next two years, ISARIC hopes to build up enough momentum to secure more funds for the research they devise and to sustain the collaboration in the years ahead. Their ambitions are large, but Steven Webb from the Royal Perth Hospital, Australia thinks that they need to move quickly. “There’s a window of opportunity for funding,” he says. “People tend to remember the last great threat to public health and, at the moment, attention has been drawn to infectious diseases because of the last pandemic. We look to capitalise on that window of opportunity before it closes.”

Image by Eneas de Troya

I've got your missing links right here (12 May 2012)

By Ed Yong | May 12, 2012 12:00 pm

Top picks

This week sees the launch of The Geek Manifesto, in which Mark Henderson argues that science needs to play (and is playing) a greater role in politics, the media, education, economy, culture and other aspects of public life. It’s a stirring rallying cry for geeks, and anyone who cares about science, everywhere. Mark’s a great science writer. Go try the book.

This is so spot-on: Michelle Nijhuis reviews two new books suggesting that scientists should fight science denial by flaunting their flaws.

Have to etch this on some foreheads: XKCD on ignorance

Epic New Yorker piece on geoengineering by Michael Specter – “The Climate Fixers“.

Some big problems with an updated psychiatry bible, and why a science journalist walked out of a symposium at the American Psychiatric Association meeting. Go Ferris!

There’s an entire family of transparent, gelatinous moth caterpillars and their goo might deter ants and other predators

“A beard twisted not by eccentricity but by the gales of distant places” – the ever-lyrical David Dobbs on a forgotten Arctic explorer

Kate Wong looks at some recent (and much needed) shakeups in paleoanthropology’s culture of secrecy, featuring the excellent John Hawks

Devastating, powerful piece on dementia. “When Illness Makes a Spouse a Stranger.”

I love the idea of a dwarf mammoth!

A list of things claimed to be as addictive as cocaine, vs a list of things that actually are. By Vaughan Bell.

Science and Truth: We’re All in It Together – nice op/ed about ivory-billed woodpeckers, comment sections & truth

The week the sun touched the Earth -great piece bout 1859’s auroral storm

A fugitive, caught after 40 years on the run, pulls off the biggest escape of his life.

‘Blood, saliva, little bits and pieces – I’m not going to miss it.’ Absolutely fascinating piece about real CSI

The Stone-Throwing Chimp Is Back — And This Time It’s Personal. Great write-up by Michael Balter

So what IS that weird blobby maybe-a-jellyfish thing? Deep Sea News has the answer. Deepstaria enigmatica. Awesome.

Climate modelers edge closer to understanding one of nature’s most complex phenomena: clouds. By Jeff Tollefson

Could you ever gestate a baby in an artificial womb? Compelling and unnerving piece by Sally Adee

FINALLY! A thoughful documentary on how tech is influencing society, without blind fear or nonsense. Kudos to Aleks Krotoski

“We can take his heart out, remove the tumour, and put it back in… However… there will be a fair amount of risk.”

How frogs invaded a Lost World. Typical wonder from Carl Zimmer.

 

News/science/writing

Maggie Koerth-Baker riffs off my post about what cancer statistics really mean

How to train hummingbirds to stab people between the eyes: a feeder you wear on your face

How does the brain avoid traffic jams? Different networks operate at different frequencies

Encyclopedia of Life passes million-species milestone

Top scientists urge governments to solve environmental dilemmas.” Yeah that should do it. Why didn’t we think of that earlier?

10,000 year old dental plaque tells tale of old diets.

Sequencing of skin cancers reveals genetic effects of sun damage.

Today’s parents are the first in history with no memory of the maiming & killing caused by polio, tetanus, diphtheria and measles. An epidemic will remind them.”

Goethe also inspired the first ever Nature editorial

“They set millions of cyber-turtles loose in a simulated North Atlantic”

What can we learn from the 900 dolphins and 4,000 pelicans washing up dead on Peru’s beaches?

Pachyderm paralympian

Tough love: Insensitive advice for PhD students.

One shall reform yo libelz. Good news about libel reform in the Queen’s speech.

Japan takes over TEPCO and injects $12 billion to help the company pay for Fukushima cleanup and compensation

Japan has gone from running on 30% nuclear power to 0%. And that’s bad news

World’s rarest gorillas caught on camera trap footage. (One is missing a hand. Another charges.)

Is eBay a black market for endangered animals?

I don’t deny that the new Brainfacts.org site is nice. Is it $1.53m nice? Not even close. I look at stuff like this and think about what the most talented of my friends could do w/ $1.53m. Then, the weeping.

Soooo… sperm hug the sides

Weaving blood vessels from strands of human tissue

Neuroscientists find that self-disclosure is intensely rewarding. I’m sure I don’t know what they mean.

Snakes on a plane, toxic mouse bombs, and an army of Jack Russells

PeerJ: an interesting biz model. “If we can seq the human genome for $100, why can’t we publish for $100”

The F-22 Raptor’s faulty oxygen system is choking its pilots, and some are refusing to fly

Dinosaurs did not fart themselves to death

“Big change via small steps” is the new black – how the pufferfish got its beak

An interview with the awesome Ian Lipkin, virus hunter extraordinaire

In spring, bat mums reabsorb male embryos

AWESOME! Massive auction of defunct forensics equipment. I baggsy the kevlar holdalls for £50

86-yr-old man buys island, replants 16,000 trees, adds giant tortoises

“For my next trick, I’ll make 20% of my genes disappear” – Lampreydini

Dear IT, my computer has bugs. Magnetotactic bacteria to be used to make computers.

French physicist jailed for 5 years was a ‘victim of overeach by draconian anti-terror laws’ say supporters

Great This Week in Virology podcast going into a lot of detail about the mutant flu controversy

“IOM (report) refutes the idea that obesity is largely result of lack of willpower on part of individuals”

Do unhatched chicks wake and sleep in their eggs? Mebbe

In search of the world’s oldest trees. (Note: bristlecone pines look awesome in black & white)

How bad is the UK Huffington Post Science section? Shockingly bad

Life of Attenborough – new series to celebrate a living legend’s 60-year span of bringing us joy

“A robot automates the recording of information from the living brain.” Like Facebook then, but at the synaptic level.

“If it’s ok with the commander, the astronaut can sleep anywhere… so long as they attach themselves to something.”

Perceptions of other’s emotions determine whether we think of ourselves as mentally ill.

 

Heh/wow/huh

No. Wrong. Realistic robot buttocks

Camel-jumping in Yemen

Unexpectedly funny headline #4839. Also, obvious surely?

“We need to get a bunch of people and ask them to walk right up to a bunch of bears. For science.”

How many people are in space right now?

Zuckerberg to basically live in your house

Joss Whedon’s love letter to his fans, in the wake of The Avengers’ success

Unstoppable. Hell yeah

Amazing. Saturn’s rings + two moons + astonishing composition

The New Yorker’s guest reviewer – Film Crit Hulk – reviews Ruffalo’s Hulk in The Avengers. In ALL CAPS

“As an entrepreneur, name recognition is important.” Nebraska man changes name to Tyrannosaurus Rex. I might change mine to “Growth Stage of Triceratops.”

This is a study by Dr Science.

“Society has asked the process of evolution if it could pull its finger out.”

A somewhat unfortunate translation

What editors think

Genomics bingo card generator

 

Journalism/internet/society

Great interview w/ Carl Zimmer on storytelling, science journalism, and how parasite stories go over with dates

Writer’s block is a romanticized catch-all” – it’s procrastination, perfectionism or fear.

Hospital will live-tweet brain surgery and put pics on Pinterest.

On an Internet that remembers all, we’ll value things that help us forget

Slate hates fact-checking and quotes. Extreme, but some of Engber’s views on quotes are sound. They are too often used as a crutch.

The beauty of Twitter’s unfollow bug

The pernicious myth that slideshows drive traffic. Love the graph.

The NYT has around 1500 pre-written obituaries for people still alive. Understandable, creepy.

The Incredible Story of the Blind Dog With His Own Guide Dog

Amazing. Real Quidditch. Everyone straddles brooms. The Snitch is a guy with a ball in a sock

How Yoni Applebaum went from being a commenter on the Atlantic to a correspondent

 

CATEGORIZED UNDER: Links

What does it mean to say that something causes 16% of cancers?

By Ed Yong | May 10, 2012 9:00 am

A few days ago, news reports claimed that 16 per cent of cancers around the world were caused by infections. This isn’t an especially new or controversial statement, as there’s clear evidence that some viruses, bacteria and parasites can cause cancer (think HPV, which we now have a vaccine against). It’s not inaccurate either. The paper that triggered the reports did indeed conclude that “of the 12.7 million new cancer cases that occurred in 2008, the population attributable fraction (PAF) for infectious agents was 16·1%”.

But for me, the reports aggravated an old itch. I used to work at a cancer charity. We’d get frequent requests for such numbers (e.g. how many cancers are caused by tobacco?). However, whenever such reports actually came out, we got a lot confused questions and comments. The problem is that many (most?) people have no idea what it actually means to say that X% of cancers are caused by something, where those numbers come from, or how they should be used. Read More

CATEGORIZED UNDER: Cancer, Medicine & health, Select

Meat-eating plant digests insects using ants

By Ed Yong | May 9, 2012 5:00 pm

Many insects eat plants, but some plants can turn the tables on their would-be diners. The pitcher plants are among several groups that can capture insects and digest their flesh. And one species – the fanged pitcher plant – goes even further. It digests insects with insects.

There are around 120 species of pitcher plants and all of them have large leaves that fold to produce fluid-filled traps. The rims of the pitchers are usually extremely slippery, and insects that wander by lose their foothold and fall into the pool of fluid within. There, they drown and are digested by the plant.

The fanged pitcher is unusual. Its rim lacks the usual waxy layer and is less slippery than those of its cousins. And it’s the only species that recruits ants. The base of each pitcher contains a swollen tendril that houses ants of the species Camponotus shcmitzi. These insects are permanent residents; they’ve never been seen in any other plant.

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