Quotulatiousness

January 31, 2013

The “clean” side of archaeology

Filed under: History, Science, Technology — Tags: , , , — Nicholas @ 09:11

BBC News has an interesting segment on how digital technology is changing the field of archaeology:

Archaeologists may not need to get their hands so dirty any more, thanks to the kind of digital technology being pioneered at Southampton University.

Its ‘µ-VIS Centre for Computed Tomography’ possesses the largest, high energy scanner of its kind in Europe: a ‘micro-CT’ machine manufactured by Nikon.

Capable of resolutions better than 0.1mm — the diameter of a human hair — it allows archaeologists to carefully examine material while still encased in soil.

Using visualisation software, archaeologists can then analyse their finds in 3D. This keeps the material in its original form, and postpones any commitment to the painstaking process of excavation by hand.

Video of the machine in operation at the BBC News site.

January 14, 2013

The increasing precision of DNA editing

Filed under: Food, Science, Technology — Tags: , , — Nicholas @ 09:56

Matt Ridley looks at the vastly improved editing tools becoming available for DNA manipulation:

Little wonder that precision genetic engineering has taken a while to arrive. In truth, it has been moving steadily toward greater precision for 10,000 years. Early farmers in what’s now Turkey introduced a mutation to wheat plants in the “Q gene” on chromosome 5A, which made the seed-head less brittle and the seed husks easier to harvest efficiently.

They did so unknowingly, of course, by selecting from among random mutations.

Fifty years ago, scientists used a nuclear reactor to fire gamma rays at barley seeds, scrambling some of their genes. The result was “Golden Promise,” a high-yielding, low-sodium barley variety popular with (ironically) organic farmers and brewers. Again, the gene editing was random, the selection afterward nonrandom.

Twenty years ago, scientists inserted specific sequences for four enzymes into rice plants so that they would synthesize vitamin A and relieve a deadly vitamin deficiency-the result being “golden rice.” This time the researchers knew exactly what letters they were putting in but had no idea where they would end up.

January 10, 2013

QotD: The mild, quiet, unassuming world of high-nitrogen compounds

Filed under: Humour, Quotations, Science — Tags: , — Nicholas @ 00:02

When we last checked in with the Klapötke lab at Münich, it was to highlight their accomplishments in the field of nitrotetrazole oxides. Never forget, the biggest accomplishment in such work is not blowing out the lab windows. We’re talking high-nitrogen compounds here (a specialty of Klapötke’s group), and the question is not whether such things are going to be explosive hazards. (That’s been settled by their empirical formulas, which generally look like typographical errors). The question is whether you’re going to be able to get a long enough look at the material before it realizes its dream of turning into an expanding cloud of hot nitrogen gas.

It’s time for another dispatch from the land of spiderweb-cracked blast shields and “Oh well, I never liked that fume hood, anyway”. Today we have a fine compound from this line of work, part of a series derived from N-amino azidotetrazole. The reasonable response to that statement is “Now hold it right there”, because most chemists will take one look at that name and start making get-it-away-from-me gestures. I’m one of them. To me, that structure is a flashing red warning sign on a dead-end road, but then, I suffer from a lack of vision in these matters.

But remember, N-amino azidotetrazole (I can’t even type that name without wincing) is the starting material for the work I’m talking about today. It’s a base camp, familiar territory, merely a jumping-off point in the quest for still more energetic compounds. The most alarming of them has two carbons, fourteen nitrogens, and no hydrogens at all, a formula that even Klapötke himself, who clearly has refined sensibilities when it comes to hellishly unstable chemicals, calls “exciting”. Trust me, you don’t want to be around when someone who works with azidotetrazoles comes across something “exciting”.

Derek Lowe, “Things I Won’t Work With: Azidoazide Azides, More Or Less”, In the Pipeline, 2013-01-09

January 2, 2013

Don’t let your BMI scare you (too much)

Filed under: Health, Media — Tags: , , , , — Nicholas @ 10:47

A quick reminder that the Body Mass Index (BMI) is more a convenient mathematical trick than an actual healthy weight guideline:

In a finding that could undermine many New Year’s resolutions, a new government study shows that people who are overweight are less likely to die in any given period than people of normal weight. Even those who are moderately obese don’t have a higher-than-normal risk of dying.

Being substantially obese, based on measure called body mass index, or BMI, of 35 and higher, does raise the risk of death by 29%, researchers found.

But people with a BMI of 25 to 30 — who are considered overweight and make up more than 30% of the U.S. population — have a 6% lower risk of death than people whose BMI is in the normal range of 18.5 to 25, according to the study, being published Wednesday in the Journal of the American Medical Association.

People who had a BMI of 30 to 35 — considered the first stage of obesity — had a 5% lower risk of dying, but those figures weren’t considered statistically significant.

In other words, a few extra pounds are not going to threaten your life (a lot of extra pounds might). In the western world, few of us have the kind of jobs that require much in the way of physical exertion and we also have both relatively low food prices and much greater access to calorie-dense food. Our parents tended to have jobs that required more physical effort and their access to food was not as great as ours (they were less wealthy overall, and didn’t eat at restaurants or fast food joints as often as we do). Two otherwise positive trends that combine to produce a less-positive result on the scales.

Earlier discussion of the limitations of BMI as a guideline here, here, here, and here.

December 23, 2012

More copper to fight superbugs

Filed under: Health, Science — Tags: , , , , — Nicholas @ 11:01

Brass and other copper-alloyed metals may have a bright future in doorknobs, handles, and other frequently handled surfaces due to a recent discovery about the metal’s ability to fight bacteria:

Researchers have discovered that copper and alloys made from the metal, including brass, can prevent antibiotic resistance in bacteria from spreading.

Plastic and stainless steel surfaces, which are now widely used in hospitals and public settings, allow bacteria to survive and spread when people touch them.

Even if the bacteria die, DNA that gives them resistance to antibiotics can survive and be passed on to other bacteria on these surfaces. Copper and brass, however, can kill the bacteria and also destroy this DNA.

Professor Bill Keevil, head of the microbiology group at Southampton University, said using copper on surfaces in public places and on public transport could dramatically cut the threat posed by superbugs.

[. . .]

In research published in the journal Molecular Genetics of Bacteria, Professor Keevil and his colleagues found that compared to stainless steel bacteria on copper surfaces bacterial DNA rapidly degraded at room temperature.

Professor Keevil added: “We live in this new world of stainless steel and plastic, but perhaps we should go back to using brass more instead.”

Tim Worstall points out that much of the stainless steel came in through health and safety regulation:

But isn’t this just great? All that modernity, all that ripping out of the old and replacement with futuristic design actually kills people?

It’s almost as fun as the discovery that the wooden chopping boards, which they made illegal, contain natural antibiotics which the plastic chopping boards, which they made compulsory, do not.

The Man from Whitehall really does not know best. And given that, can we hang them all from the Christmas tree please? It would usher in such a jolly New Year.

November 29, 2012

Josephine Tey’s The Daughter of Time

Filed under: Books, Britain, History, Media — Tags: , , , — Nicholas @ 09:20

In History Today, Paul Lay talks about the power of well-written historical fiction to raise interest in real history:

The case of Richard III was long ago examined in a historical novel, which has come to recent public prominence due to its championing by the High Tory journalist Peter Hitchens and the Cambridge classicist Mary Beard, an incongruous pairing if ever there was one. The subject of their mutual admiration is Josephine Tey’s 1951 thriller, her last, The Daughter of Time. It takes its title from Francis Bacon’s adage — ‘Truth is the daughter of time, not of authority’ — and features Tey’s fictional detective, Inspector Alan Grant. At the start of the novel he has broken his leg and is recuperating in hospital. There he is handed a reproduction of a contemporary portrayal of Richard III. Grant fancies himself as a great judge of character and is convinced that the king he sees before him is a kindly and wise character, the very opposite of the Shakespearean monster. With his leg on the mend, Grant heads off to the British Museum to research the truth about the king’s life.

Grant’s conclusion makes The Daughter of Time a firm favourite with members of the Richard III Society, apostles of the last Plantagenet, for the inspector convinces himself that Richard III is indeed a victim of the Tudor propaganda machine. We can believe that or not, but what makes The Daughter of Time such a compelling read is not its rather flimsy conclusion but its extraordinary depiction of process, for few books have so vividly brought to life the historian’s quest, the desire to reveal exactly what happened in the past and the methods used to discover that truth. That’s why historians love it. Beard found it an inspiring work: it ‘partly made me a historian’, she claims; while Hitchens praises Tey’s ‘clarity of mind’; her ‘loathing of fakes and propaganda are like pure, cold spring water in a weary land’.

November 17, 2012

“3D printing will be bigger than the web”

Filed under: Business, Technology — Tags: , , , , — Nicholas @ 12:46

While I’m not quite willing to go as far as Chris Anderson (quoted above), I do think 3D printing is going to be a fantastic development in our very-near future:

Chris Anderson has exited one of the top jobs in publishing — Editor-in-Chief of Wired magazine — to pursue the life of an entrepreneur, making a big bet that 3D printers represent a massive new phase of the industrial revolution.

He spoke at a Wired “Culturazzi” event, at the Marriott Union Square and to sign copies of his latest book: Makers: The New Industrial Revolution.

Mr Anderson is always an excellent speaker and his talk covered the beginnings of the Industrial Revolution, which he picked out as the invention of the Spinning Jenny in 1764 — a hand powered machine for spinning yarn.

I’d have pinned the start of the Industrial Revolution to the invention of the steam engine and its ability to power large numbers of machines thus enabling the first factories — which represented aggregated labor energy. Scale makes factories viable.

But I can see why Mr Anderson would favor the Spinning Jenny as it was a high-tech machine that was kept in a home — just as 3D printers are home based, completing a neat cycle of history.

November 14, 2012

The “manufacturing fetish”

Filed under: Economics, Media, Politics — Tags: , , , , — Nicholas @ 10:54

John Kay talks about the widespread belief that only manufacturing is “real” in terms of what a national economy produces:

Manufacturing fetishism — the idea that manufacturing is the central economic activity and everything else is somehow subordinate — is deeply ingrained in human thinking. The perception that only tangible objects represent real wealth and only physical labour real work was probably formed in the days when economic activity was the constant search for food, fuel and shelter.

A particularly silly expression of manufacturing fetishism can be heard from the many business people who equate wealth creation with private sector production. They applaud the activities of making the pills you pop and processing the popcorn you eat in the interval. The doctors who prescribe the pills, the scientists who establish that the pills work, the actors who draw you to the performance and the writers whose works they bring to life; these are all somehow parasitic on the pill grinders and corn poppers.

When you look at the value chain of manufactured goods we consume today, you quickly appreciate how small a proportion of the value of output is represented by the processes of manufacturing and assembly. Most of what you pay reflects the style of the suit, the design of the iPhone, the precision of the assembly of the aircraft engine, the painstaking pharmaceutical research, the quality assurance that tells you products really are what they claim to be.

Physical labour incorporated in manufactured goods is a cheap commodity in a globalised world. But the skills and capabilities that turn that labour into products of extraordinary complexity and sophistication are not. The iPhone is a manufactured product, but its value to the user is as a crystallisation of services.

[. . .]

Most unskilled jobs in developed countries are necessarily in personal services. Workers in China can assemble your iPhone but they cannot serve you lunch, collect your refuse or bathe your grandmother. Anyone who thinks these are not “real jobs” does not understand the labour they involve. There is a subtle gender issue here: work that has historically mostly been undertaken by women at home — like care and cooking — struggles to be regarded as “real work”.

October 20, 2012

Instead of electric cars, how about nitrogen-powered cars?

Filed under: Technology, USA — Tags: , , , , — Nicholas @ 00:03

The Economist looks at the performance of electric cars, fuel-cell cars, and nitrogen-powered cars:

As long as its storage container is well insulated, liquid air can be kept at atmospheric pressure for long periods. But on exposure to room temperature, it will instantly boil and revert back to its gaseous state. In the process, it expands 700-fold — providing the wherewithal to operate a piston engine or a turbine.

Liquid nitrogen does an even better job. Being considerably denser than liquid air, it can store more energy per unit volume, allowing cars to travel further on a tankful of the stuff. Weight for weight, liquid nitrogen packs much the same energy as the lithium-ion batteries used in laptops, mobile phones and electric cars. In terms of performance and range, then, a nitrogen vehicle is similar to an electric vehicle rather than a conventional one.

The big difference is that a liquid-nitrogen car is likely to be considerably cheaper to build than an electric vehicle. For one thing, its engine does not have to cope with high temperatures — and could therefore be fabricated out of cheap alloys or even plastics.

For another, because it needs no bulky traction batteries, it would be lighter and cheaper still than an electric vehicle. At present, lithium-ion battery packs for electric vehicles cost between $500 and $600 a kilowatt-hour. The Nissan Leaf has 24 kilowatt-hours of capacity. At around $13,200, the batteries account for more than a third of the car’s $35,200 basic price. A nitrogen car with comparable range and performance could therefore sell for little more than half the price of an electric car.

A third advantage is that liquid nitrogen is a by-product of the industrial process for making liquid oxygen. Because there is four times as much nitrogen as oxygen in air, there is inevitably a glut of the stuff — so much so, liquid nitrogen sells in America for a tenth of the price of milk.

October 17, 2012

Elon Musk drops hints about next SpaceX development direction

Filed under: Space — Tags: , , , , , — Nicholas @ 00:03

Zach Rosenberg reports on the next big thing we can expect from SpaceX:

Launcher developer SpaceX has promised a new engine for a new rocket, larger than the Falcon 9 that NASA expects to become a mainstay of its Earth orbit operations.

Elon Musk, the Silicon Valley entrepreneur who successfully parlayed the fortune he earned founding PayPal into launch systems developer SpaceX, said the new engine would not be based on the 160,000lb-thrust (712kN) Merlin 1 series that powers Falcon 9.

Musk said the new rocket, which he calls MCT, will be “several times” as powerful as the 1 Merlin series, and won’t use Merlin’s RP-1 fuel. Beyond adding that it will have “a very big core size”, he declined to elaborate, promising more details in “between one and three years”.

Musk declined to say what ‘MCT’ stands for, and declined to answer further questions on the project.

October 16, 2012

Sorting out the real Ada Lovelace from the legend

Filed under: Britain, History, Science, Technology — Tags: , , — Nicholas @ 08:18

At The Register, Dave Wilby tries to get to the real contributions of Ada Lovelace:

Ada Lovelace is a compellingly romantic figure, irresistible in today’s age of equal geeky opportunities.

The daughter of “mad, bad and dangerous to know” Lord Byron, her mathematics-loving mother Annabella Milibanke purportedly beat the poet out of her with relentless studies in science, maths and logic.

A beauty enthralled by scientific progress, cut down in her prime after the publication of her most notable work, Lovelace is often easily romanticised and reimagined as a steam punk heroine spearheading female invention and scientific emancipation.

Such claims are sure to be made again with Ada Lovelace Day today.

This image is fanciful, though, and to the unfortunate detriment of her genuine contribution to British technology.

So what are the facts? What did Ada Lovelace really achieve? Did she outshine her female contemporaries in the scientific field? And what debt do today’s female scientists really owe her?

September 28, 2012

The future of electronics might be biodegradable

Filed under: Health, Technology — Tags: , , — Nicholas @ 08:14

Brid-Aine Parnell at The Register, talking about specialized electronic development:

When it comes to electronics, boffins are usually going one way — how to make them smaller, faster and longer lasting, but a few researchers are going against the tide — looking for electronics that can last just a moment and then disappear.

At the University of Illinois, with help from Tufts and Northwestern Universities, scientists have come up with biodegradable electronics that can do their job and then dissolve. Apart from reducing the amount of consumer electronics in landfills, the disappearing gizmos could also work as medical implants, before dissolving in bodily fluids, as environmental monitors or any other device that needs to disappear.

“From the earliest days of the electronics industry, a key design goal has been to build devices that last forever — with completely stable performance,” Illinois professor of engineering and project leader John Rogers said.

“But if you think about the opposite possibility — devices that are engineered to physically disappear in a controlled and programmed manner — then other, completely different kinds of application opportunities open up.”

September 25, 2012

A bit more progress in autism research

Filed under: Health, Science — Tags: , , , — Nicholas @ 10:19

An article at the Wall Street Journal discusses some recent advances in uncovering the causes of autism:

Scientists say that roughly 20% of autism cases can be linked to known genetic abnormalities, and many more may be discovered.

Pinpointing a genetic explanation can help predict whether siblings are likely to have the disorder — and even point to new, targeted treatments. Last week, for example, researchers reported that an experimental drug, arbaclofen, reduced social withdrawal and challenging behaviors in children and adults with Fragile X syndrome, the single most common genetic cause of autism.

[. . .]

Autism spectrum disorder (ASD) is a collection of conditions that can range in severity from the social awkwardness and narrow interests seen in Asperger’s to severe communication and intellectual disabilities. ASD now affects 1 in every 88 U.S. children — nearly double the rate in 2002 — according to the Center for Disease Control and Prevention.

No single blood test or brain scan can diagnose autism spectrum disorders — in part because environmental factors also play a major role. But once a child is diagnosed, on the basis of symptoms and behavioral tests, researchers can work backward looking for genetic causes.

Both the American Academy of Pediatrics and the American College of Medical Genetics recommend that all children diagnosed with ASD be tested for Fragile X Syndrome and other chromosome abnormalities. The newest tests, called chromosomal microanalysis, can identify submicroscopic deletions or duplications in DNA sequences known to be associated with autism. Together, these tests find genetic explanations for more than 10% of autism cases.

September 18, 2012

Don’t give up hope for warp engines just yet

Filed under: Science, Space, Technology — Tags: , , , , — Nicholas @ 11:28

As we all know, Star Trek‘s faster-than-light warp engines were mere plot devices, not actual ones. There’s no way to travel faster than light, so even our great-grandkids won’t be tripping off to distant (or even nearby) star systems. But wait … NASA’s Harold White looks poised to become the latest hero of the “we wanna go faster than light” brigade:

A top NASA boffin has outlined ongoing lab experiments at the space agency aimed at first steps towards the building of a warp-drive spacecraft theoretically capable of travelling at 10 times the speed of light.

The latest developments at the “Eagleworks” super-advanced space drive lab at NASA’s Johnson Space Center were outlined by NASA physicist Harold White at a conference on Friday. The Eagleworks lab was set up at the end of last year to look into such concepts as the Quantum Vacuum Plasma Thruster and also so-called “warp drives” along the lines proposed by Mexican physicist Miguel Alcubierre in the 1990s.

[. . .]

Unfortunately, subsequent investigation appeared to show that while the warp drive might work it would be unfeasibly power hungry: it would require a minimum amount of energy equivalent to completely annihilating the mass of the planet Jupiter.

However White and his NASA Eagleworks colleagues say that’s not necessarily so: it’s all down to the shape of the ring. An improved doughnut design, as opposed to a flat ring, would get the requirement down to something more like just annihilating the Voyager One probe craft.

Voyager masses in the region of 800kg, so by our calculations one would still need a lump of antimatter (or other reasonably compact super power source) which — if it were mishandled — would explode with a force of some 17,000 megatons, equivalent to several global nuclear wars all in one (or 600-odd Tunguska meteor strikes etc). This would inconveniently take humanity’s current atom labs billions of years to make, and there would be other practical issues (see our previous antimatter-bomb analysis here, and then there’d be the exoto-doughnut to fabricate etc).

September 11, 2012

More evidence that a bit of dirt can be a healthy thing for kids

Filed under: Health, Media, Science — Tags: , , , — Nicholas @ 00:02

Matt Ridley reviews a new book by Moises Velasquez-Manoff:

In a remarkable new book, “An Epidemic of Absence,” Moises Velasquez-Manoff draws together hundreds of such studies to craft a powerful narrative carrying a fascinating argument. Infection with parasites prevents or ameliorates many diseases of inflammation. The author briefly cured his own hay fever and eczema by infecting himself with hookworms-before concluding that the price in terms of diarrhea and headaches was too high.

I’ve touched on the “hygiene hypothesis” in these pages before. In its cartoon form the argument-that in a clean world our immune system gets bored and turns on itself or on harmless pollen-isn’t very convincing. But Mr. Velasquez-Manoff makes a far subtler, more persuasive case. Parasites have evolved to damp our immune responses so that they can stay in our bodies. Our immune system evolved to expect parasites to damp it. So in a world with no parasites, it behaves like a person leaning into the wind when it drops: The system falls over.

Moreover, just as brains outsource much of their development to the outside world-the visual system is refined by visual input, the language system can only develop in a language-using society — so the immune system seems to have happily outsourced much of its regulation to friendly microbes. Without them, the immune system becomes unbalanced.

[. . .]

One of Mr. Velasquez-Manoff’s most surprising chapters is on autism, a disorder that almost exactly parallels asthma in its recent rise among affluent, urban, mainly male, disproportionately firstborn people. Better diagnosis explains perhaps half the rise, but the brains of people with autism are often inflamed, and there’s anecdotal evidence that infection with worms or viruses can tame autistic symptoms, at least temporarily.

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