Could Warm Feet Save the World?

Warm feet - photo by spiralz

Wind turbines, photovoltaic power cells, wave energy, porous hydrogen storage composites for fuel cells, carbon sequestration, nuclear, even the idea of damming the Red Sea for a massive hydroelectric power plant are among the high-tech approaches being developed in the battle to reduce our collective size 9 carbon footprints to mere tiptoes.

Saving energy and reducing emissions does not have to be about high tech and macro engineering. The developed world is unlikely ever to give up its dependence on personal motor transport, frequent and pointless air travel, patio heaters, high-definition DVDs, hot and cold running water, and countless other energy-intensive luxuries unless someone actually physical pulls the power plug.

However, for millions of people in the developing world, who may not even be aware of the problems we face with iPhone tariffs, double booked business flights, and lost Facebook friends, life is hard at a much more fundamental level. Aside from poverty, unreliable water supply, malnutrition and disease, even very basic needs are not met, such as keeping warm and dry in freezing mountain villages with no access to heated spa pools and acrylic nail extensions, and wireless internet access to refresh the contents of your Kindle.

D. Buddhi of the Thermal Energy Storage Laboratory at Devi Ahilya University in Indore, India, Atul Sharma of the Department of Mechanical Engineering at Kun Shan University, Tainan, Taiwan, ROC, and S.D. Sharma of UAE Innovations Center in Ras Al Khaimah, UAE have turned to a perennial problem of those without the comforts of central heating and doubly glazed windows – keeping one’s feet warm.

The researchers have designed and tested three foot warmers that can store up solar energy during sunshine hours and then be used during cold evenings as a sustainable alternative to electric heaters. The optimum temperature, the team found in their trials, was just above body temperature. With this in mind, commercial grade lauric acid (which has a melting point 42.2 Celsius and a latent heat of fusion of 181 kilojoules per kilogram was used as the latent heat storage material in their PCM (phase change material) designs. Basically, the material inside melts in the sun and then once the sun goes down the material begins to solidify giving off enough latent heat as it does so to raise the temperature of the container to about 40 Celsius.

They carried out experiments (details are reported in the International Journal of Global Energy Issues) during a winter season to study how well the PCM units performed in the sunny but cold winter climate of northern India. The devices could easily reduce reliance on costly 1 kilowatt electric heaters for keeping the legs and feet warm; and although PCM units do not have the benefit of creating circulating warm air in a room, much of that energy is wasted anyway.

So, could a solar-powered foot warmer save the planet? Perhaps not, at least not until those in the developed world abandon their predilection for vehicle climate control and optical mice. However, alongside other simplified technologies such as solar cookers, arsenic-removing water filters, and clockwork radios, they could at least make a significant difference to the cost of living of people in the poorer parts of the world without compromising their quality of life. Moreover, those in frozen climes will at least be able to keep their feet warm while pondering shag pile carpets and remote control storm shutters.

WiChempedia Coming Soon

It seems it’s now public knowledge that WiChempedia is on its way thanks to Tony Williams at ChemSpider and his colleagues.

“Over the past few weeks I have had a few discussions with a member of the ChemSpider Advisory group regarding a concept to create WiChempedia. I’ve enjoyed these conversations with Alex Tropsha (professor and Chair in the Division of Medicinal Chemistry and Natural Products in the School of Pharmacy, UNC-Chapel Hill),” says Williams in his latest blog post.

Over the past few weeks Williams and his colleagues have been looking at the quality of data on Wikipedia and trying to figure out the best way to mash ChemSpider’s efforts with those of the WP:CHEM team. “Our intention is to deliver wiki-capabilities in ChemSpider and to use the Open Content associated with chemicals and drugs on Wikipedia inside the system,” Williams says, without, he adds, reinventing the wheel or offending the Wikipedians.

“My intention as we work through downloading the data and to check, validate and correct what is sitting on Wikipedia directly for benefit to the community,” adds Williams.

Volcanoes, Moons, Pearls, and Alchemy

Moon (Photo by David Bradley)

This month’s physical sciences Spotlight over on the Intute site turns on oceanic plans, lunar volcanoes, and pearl necklaces:

Infertile Global Warming Plan – Plans to fertilize the oceans with iron or other nutrients in order to absorb atmospheric carbon dioxide and so ward off global warming are not viable according to a report from researchers at Stanford and Oregon State Universities.

Buckyball Pearl Necklace – A new type of polymer material made by stringing together the tiny football-shaped fullerene molecules has been synthesised by chemists in Spain. Under the microscope, the material resembles a string of pearls.

Volcanoes of the Moon – Even though astronauts have set foot on the Moon, analysed its surface and brought samples back to Earth, we do not yet fully understand the Moon’s origins nor how it has evolved during the last few billion years since its formation. New clues have now emerged from a study of the Moon’s past volcanic activity that suggest that volcanic activity began 4.35 billion years ago (+/- 0.15billion), a relatively short time after the formation of our planet’s biggest satellite.

And, in ChemWeb’s The Alchemist newsletter: Small-scale chemistry with a variety of applications that could improve not only healthcare but the environment has led to the Small Times innovation award going to Louisiana Tech’s Yuri Lvov, The Alchemist hears this week. Also in chemistry news, old anticancer drugs could be repurposed for treating genetic blood disorders sickle-cell anemia and beta-thalassemia.

A barrel of fun is to be had analyzing wine barrels for dioxins and polyaromatic hydrocarbons, while laser light has been found to switch vanadia films from reflective to transparent without heating, a possible boon for optoelectronics applications. Finally, in this week’s Alchemical selection, holy double-helical nanorings of DNA with single-stranded gaps have been engineered by German scientists while US researchers have demonstrated that pouring millions of dollars and tons of iron into the oceans may not have the desired effect on reducing atmospheric carbon dioxide levels after all.

Googling for Genes

Those clever people at Harvard are using Google‘s API to allow users to search for gene sequence fragments on the Web in combination with a text query. You’re limited to 1000 searches per day and have to enter your own API key to get the maximum benefit. But. that’s probably enough to be going on with.

From the site: Query Gene is distinctive because it is not limited to a single database. Instead it captures genetic information across the net using Google. It works by taking a gene sequence in combination with other search terms, finds similar sequences using NCBI’s MegaBlast, retrieves the descriptions of those matching genes from NCBI’s Entrez Nucleotide database, and performs a series of Google searches using the combination of your original search terms and each gene description. The percent sequence identity is indicated alongside each match: this indicates how much of your queried sequence is contained in the sequence it matches.

You might want to find out what disease states are associated with a specific nucleotide sequence. No problem. Paste in the sequence and enter a text phrase, such as “genetic disease associated with” and up pop the results. Well, actually, they didn’t with the test I tried, but that could be down to my browser configuration. I got “Sorry, we are under maintenance: Please try again in a few weeks”.

A sample sequence is given here. If someone else could confirm or refute the maintanance outage for ChemSpy readers that would be very helpful.

Sciencebase Top Ten Molecules of 2007

Graphene

Everyone loves a list. (Don’t they?) Well, as we’re approaching the end of the year and some of us are well into the panto and party season already, I thought it would be a good idea to run down a hit parade of this year’s molecules. So, here’s the Sciencebase Top Ten Molecules of 2007:

  • 10 – Graphene – chicken wire carbon sheets hit the headlines this year and will continue to do so as researchers learn more about this unique material’s optical and electrical properties. One day, carbon may even replace silicon as the elemental of choice in computing.
  • 9 – Helium – at the time of writing physicists in Canada had taken an important step towards understanding supersolidity in helium, stretching it a bit to include this in a list of molecules. This new state of matter forms at very low temperature and under extreme pressure and now it has been found that cooling makes supersolid helium even stiffer.
  • 8 – DNA – deoxyribonucleic acid, and more specifically, the deoxyribonucleic acid that resides in every cell of genomics pioneer Craig Venter. The J Craig Venter Institute claims that this “Independent sequence and assembly of the six billion base pairs from the genome of one person ushers in the era of individualized genome-based medicine”.
  • 7 – Water – Good old H2O continues to confound those scientists hoping to explain its anomalous properties, as supplies of the fresh stuff will dwindle as the century moves on, it’s heartening to know that close to absolute zero, water exists in yet another phase.
  • 6 – Ethanol – a seasonal favourite, of course, the active ingredient in so many beverages. As with a certain other molecule in this Top Ten, this year there has been a lot of hot breath resulting from various and conflicting health studies on the effects of ethanol on human health, expectant mothers and their unborn children, and others. So…raise your glasses to ethanol!
  • 5 – Rotaxane – 140 years ago, Scottish physicist James Clerk Maxwell devised a thought experiment that might help scientists break the law. An entirely legal, molecular version of Maxwell’s Demon made its debut this year, thanks to chemists at Edinburgh University.
  • 4 – Azadirachtin – After decades of trying and countless post-doc and grad students have come and gone Steve Ley at Cambridge University finally published a total synthesis for the natural insecticide azadirachtin.
  • 3 – Epothilone – could the anticancer drugs produced by soil microbes finally have come of age with the announcement from pharma giant Bristol Myers Squibb that it has obtained approval in the US for semi-synthetic analogue of epothilone B against drug-resistant metastatic breast cancer.
  • 2 – Carbon dioxide – this year, there has been more hot air produced around this greenhouse gas and climate change than I care to cite.
  • 1 – Hydrogen sulfide – yet another small molecule with a big impact. Scientists recently discovered that H2S could be the key to longevity, at least if you’re a nematode worm. A study published in PNAS in December demonstrated that the “rotten egg” molecule increases heat tolerance and lifespan in the molecular biologist’s favourite, Caenorhabditis elegans
  • Well, those are my choices, I deliberately avoided looking at Science to see what they’d come up with for their Molecule of the Year, before I put this post together. If anyone has their own Top Ten or even just a Number 1 let me know.

Youtube for Scientists

Youtube for scientists

Regular readers will know that I have a penchant for posting science videos every now and then. I’ve written about vids on how to explain Newton’s laws with Lego, A spoof sweet potato battery to power your mp3 player, Einstein meets Hendrix, and desktop hockey with one of the most water-repellent materials ever invented from chemists at Queen’s University Belfast. Youtube has long since been oustripped as the place to go for science-related videos, there are dozens of sites that specialise in science videos:

Science Hack, for instance, showcases hundreds of videos every one of which has been screened by a scientist to verify its accuracy and quality. Typical searches include Hubble, Space, Sulfur Hexafluoride, Psychology, and the site has its own Facebook app if you’re feeling supra-uber-geekish. Indeed, I’ve used the Science Hack Facebook app on my own Facebook pages.

Science press release repository Science Daily also has its own dedicated video channel. At the time of writing, top video posts included “Engineers Measure Blood Alcohol Content With Spectroscopy”, “Cardiac Electrophysiologists Make MRIs Safe For People With Pacemakers”, and “Engineers Build Automated Parking Garage”.

Often referred to as Youtube for scientists, SciVee.com doesn’t really have any more of a claim to such a title as any of the other science vid sites listed here, but it is good, carrying an intriguingly entitled video called “Ten Simple Rules for Making Good Oral”, which turns out to be about presentations rather than anything else.

AthenaWeb has also been given that Youtube for geeks label (like there could be anything more geeky than using Youtube in the first place) by various bloggers. I’m pretty sure AthenaWeb has gone through at least a couple of launches, but it looks pretty fresh today and offers a Top 5 science videos, which include an exploration of nanotechnology and one on apoptosis, or cell death.

Then, if you want to limit yourself to one science guy, there’s Robert Krampf who has a stack of science experiments he records to video, in fact one or two of his videos have featured on Sciencebase in the past, including Save a balloon with water.

Finally, in this brief round-up, there is Youtube itself, which is the archetypal Youtube for Scientists. Just follow a search for science to bring up a goodly number of science vids.

There are many other science video directories (including VideoJug’s environment section, the public relations offices at various companies, universities, and other organisations often include videos with their output. If you know of any gathering place or the next Youtube for scientists, let me know by putting the link in the comments frame below.

8 Squeezes for Your iPhone Battery

Battery life (Image courtesy of BatteryUniversity.com)

If you’ve just bought an iPhone, you’re probably expecting many happy years of battery power. Well, not so fast. Laptop batteries are very similar to rechargeable batteries in other devices, they wear out. I’ve had my current laptop for about 18 months and in the last few weeks I’ve noticed that I’m not getting quite the battery life from it that I was when I first bought it. I used to be able to run for about 3 hours doing wordprocessing, email, and web browsing even on a wireless connection. Lately, however, the lithium battery seems to run down within an hour or so, which is a real pain when I’m offsite.

I checked out Battery University to see if there is anything I can do to get my battery life back to normal. Apparently, there isn’t, and as a chemist, I should have known that (it’s all about crystallization of the components and such). It turns out that I basically broke all the rules concerning lithium battery use. Here’s a quick run down of what you should and shouldn’t do to help maintain the health of any lithium battery whether in a laptop, iPhone (other hybrid devices are available):

  1. Avoid frequent full discharges; regular partial discharges and an occasional full discharge are better. Lithium batteries have no charge “memory”, unlike NiCd batteries, so frequent recharging does no harm.
  2. Carry out a deliberate full discharge once every 30 charges, you can do this by simply running the battery down in the equipment (if you have power management enabled switch it off temporarily and make sure you are not running any critical software). An advantage of this approach is that it helps calibrate the battery fuel gauge and avoids premature hybernation.
  3. Keep the lithium-ion battery cool. Heat is a killer for batteries. Don’t leave your device in a hot car or window ledge, don’t use a laptop on your lap (how’s that for irony), above about 45 Celsius, a lithium will wear out very quickly.
  4. If you’re running on fixed power, think about removing the battery from a laptop to reduce the impact of internal heat. Of course, you lose the mobility advantage of the battery and also the safety should your mains power go down.
  5. Don’t buy spare lithium-ion batteries to use later on. Even when not in use a lithium battery will age.
  6. If you do have a spare lithium-ion battery, use one most of the time and keep the other wrapped in a hermetically sealed plastic box or bag in the refrigerator, but do not freeze your battery.
  7. If you have to store your battery or device, make sure it’s charged to about 40% before leaving it for extended periods.
  8. If you’ve just bought a new device, follow this advice and pop back in a year or so to let me know how you got on. After 12 months any lithium battery no matter how well looked after may lose up to 20% of its charging capacity but if you’ve lost more than that, then you probably broke the Battery University rules.

This post was originally destined for my blogging and browsing tips site Significant Figures, for more of the same and different again, check out the Sig Figs site at sciencetext.com

Electrochemical Synthesis of Metal and Semimetal Nanotubes

A rather intriguing paper has just been published by the Cambridge-based publishing wing of the Royal Society of Chemistry and highlighted by the scathing, satiricial crew at The Register (don’t visit that link if easily offended). It’s an outrage says The Register, but they’ve given the team a vulgar acronym award for their abbreviation of “copper nanotubes” and “bismuth nanotubes” nevertheless.

I’ll say no more except that apparently “Philip of Cambridge” tipped off The Register about this paper. Now, I’d like to know is “Philip” an aggrieved ex-member of the RSC’s Cambridge staff or is this another of that organisation’s rather adventurous (and some would say pointless) attempts to get its name mentioned in the media in the context of some spurious chemical happening (remember Carol Vorderman in mauveine dyed Victorian costume, or Superman on the side of buses in Hull?)

Fourteen Do’s and Don’ts for Medical Bloggers

acmedsci snake shhhh

Fellow freelance journalist James Butcher alerted me to the existence of a clutch of rather verbose guidelines for journalists and others pertaining to the reporting of medical research results.

The guidelines were published in November by the UK’s Academy of Medical Sciences, an organisation that apparently promotes advances in medical science and campaigns to ensure these are translated as quickly as possible into healthcare benefits for society. The report primarily highlights the role of observational research in identifying environmental and lifestyle causes of disease, such as obesity and diabetes, cancer, cardiovascular disease etc, but warns researchers against overstating the importance of their findings.

The guidelines themselves actually formed part of a much wider document entitled not very snappily: Identifying the environmental causes of disease: how should we decide what to believe and when to take action?. The report’s title alone should have warned readers by now that the guidelines themselves are likely to raise a few issues.

Of course, most medical and science journalists will already have their own internal list of guidelines to follow, probably in much clearer and simple English, and directed firmly in the direction of writing the best piece they can rather than aimed at satisfying some higher bureaucratic order. Depending on the writer’s background these internal guidelines will overlap in essence with the fourteen do’s and don’ts listed below and in other areas there will be little common ground.

Some might say that the list of guidelines is a little patronising to journalists and written in an ostentatious and overblown manner. Others might point out that they assume far too much prior knowledge. Do political, legal, financial, and arts correspondents get such lists of guidelines I wonder? Would those correspondents, as opposed to a science or medical writer understand the technicalities of item 1a “What is the sample?” Well, if you know how to answer that question, you probably don’t need the guidelines, and if you don’t know how to answer it then you should maybe stick to covering art gallery openings and ministerial indiscretions. Either that or head back to school for a quick stats course.

This is not the first time an organisation like this has attempted to lay down guidelines for journalists and others. The Royal Society made an attempt at it a few years ago and recently revised them. Ironically, they did not consult the Association of British Science Writers in producing their guidelines and so they went down like the proverbial plumbum inflatable. More to the point, rulez is for breakin’ and if you’re a (tabloid) hack intent on writing a health scare story, then you’re going to write it regardless of any list of guidelines from an organisation of which you have probably never even heard. And, if you’re not a scaremonger, then, as I said before, you will already have your own endogenous list of guidelines.

Perhaps what is needed is some kind of guidance for the public rather than the journalists that allows them to make more sense of the dozens and dozens of health stories on cancer, obesity, estrogen, bird flu, HIV, MMR vaccination. Such advice might help them to see the facts when those internal guidelines have been overridden in the name of great headlines.

It would be an interesting exercise to analyse each of the news articles and others that I cited in a recent post entitled Obesity News Epidemic, to see just how well each of those mesh with the ACMedSci guidelines. Anyone care to take on the research project?

Anyway, with ACMedSci permission I’ve cribbed the guidelines below for your delectation and to save you wading through the 150 pages of the less-than snappy document. They were originally aimed at journalists and others in the media, presumably to help prevent sensationalisation and healthscares. They could be equally useful/useless (del. as applic.) to bloggers and others too.

  1. Pay detailed attention to the methodology of all studies being reported. Important questions to consider include: a. What was the sample? b. What were the measures? c. How strong were the effects in both relative and absolute terms? d. Has there been adequate attention to alternative explanations, and to good control of possible confounding variables? e. Has the finding been replicated? f. Is there supporting experimental or quasi-experimental evidence? g. Are the findings in keeping with what is known about disease mechanisms?
  2. Whilst it may not be appropriate to offer extensive discussion of all these details when writing or speaking to the general public, key aspects can be communicated successfully using clear, jargon free, language.
  3. The science or medical correspondent needs to have an appropriate grasp of the scientific issues in order to know how best to convey what was novel, interesting and important in the research.
  4. Exercise appropriate judgment in identifying and drawing attention to those points of design that are particularly relevant to the study in question – especially when ignoring them might lead to misunderstanding.
  5. Bear in mind the research track record of the researchers and of their employing institutions.
  6. Consider whether there are any conflicts of interest that might lead to possible bias.
  7. Seek to determine the theory or set of biological findings that constitute the basis for the research – noting how this fits in with, or forces changes in, what we already know or believe.
  8. Whilst paying appropriate attention to competing views, be wary of creating spurious and misleading ‘balance’ by giving equal weight to solid research evidence and weakly supported idiosyncratic views.
  9. Be very wary of drawing conclusions on the basis of any single study, whatever its quality.
  10. When considering public policy implications, draw a careful distinction between relative risk (i.e. the increased probability of some outcome given the disease causing factor) and absolute risk (i.e. the probability of that disease outcome in those with the disease risk).
  11. Use simple counts to describe risk whenever possible, rather than probabilities.
  12. Be careful, insofar as the evidence allows, to clarify whether the causal effect applies to everyone or only to a small special sub-segment of the population.
  13. Set the causal factor you are describing in the context of all known causal factors, whilst explaining that there may be others, as yet unknown or unsuspected.
  14. In writing about research, seek to educate and engage readers with the science and to encourage them to think critically.

Mickey Mouse Protein

A detailed structure of a potassium ion channel protein has been obtained by a Nobel team in the US. The structure shows the channel in a more natural state, revealing how attendant lipid molecules within the cell membrane influence channel function by their interaction with the proteinaceous Mickey Mouse ears that protrude from the protein into the lipid layer and act as a voltage sensor.

Membrane-bound proteins are among the most fascinating molecules in biology but are notoriously difficult to crystallise and study in detail in their natural, or even near-natural state. Now, Nobel scientist Roderick MacKinnon and colleagues at Rockerfeller University, have developed a new technique, lipid-detergent-mediated crystallization, which could open the door to studying the hundreds of membrane proteins previously inaccessible in their natural environment to crystallography.

More in the latest issue of SpectroscopyNOW crystallography ezine