Here’s to the first paper a month post for 2012!
For January I decided to blog a paper I heard about on the excellent Nature podcast about a deliciously simple and elegant experiment to test a very simple question: given how much time and effort boa constrictors (like the one on above, photo taken by Paul Whitten) need to kill prey by squeezing them to death, how do they know when to stop squeezing?
Hypothesizing that boa constrictors could sense the heartbeat of their prey, some enterprising researchers from Dickinson College decided to test the hypothesis by fitting dead rats with bulbs connected to water pumps (so that the researchers could simulate a heartbeat) and tracking how long and hard the boas would squeeze for:
The results are shown in figure 2 (to the right). The different color bars show the different experimental groups (white: no heartbeat, gray: heartbeat for 10 min before stopping, and black: continuous heartbeat). Figure 2a (on top) shows how long the boas squeezed for whereas Figure 2b (on bottom) shows the total “effort” exerted by the boas. As obvious from the chart, the longer the simulated heartbeat went, the longer and harder the boas would squeeze.
Conclusion? I’ll let the paper speak for itself: “snakes use the heartbeat in their prey as a cue to modulate constriction effort and to decide when to release their prey.”
Interestingly, the paper goes a step further for those of us who aren’t ecology experts and notes that being attentive to heartbeat would probably be pretty irrelevant in the wild for small mammals (which, ironically, includes rats) and birds which die pretty quickly after being constricted. Where this type of attentiveness to heartrate is useful is in reptilian prey (crocodiles, lizards, other snakes, etc) which can survive with reduced oxygen for longer. From that observation, the researchers thus concluded that listening for heartrate probably evolved early in evolutionary history at a time when the main prey for snakes were other reptiles and not mammals and birds.
In terms of where I’d go next after this – my main point of curiosity is on whether or not boa constrictors are listening/feeling for any other signs of life (i.e. movement or breathing). Obviously, they’re sensitive to heart rate, but if an animal with simulated breathing or movement – would that change their constricting activity as well? After all, I’m sure the creative guys that made an artificial water-pump-heart can find ways to build an artificial diaphragm and limb muscles… right?
(Image credit – boa constrictor: Paul Whitten) (Figures from paper)
Paper: Boback et al., “Snake modulates constriction in response to prey’s heartbeat.” Biol Letters. 19 Dec 2011. doi: 10.1098/rsbl.2011.1105
We’ve blogged before about applying gaming technology to science, but much of that has been about using games or gaming system chips. A recent Wired magazine article reveals another interesting use case: taking the capabilities of something like Microsoft’s Xbox360 Kinect system and applying it directly to science research!
Apparently, a number of groups have decided to try out the Kinect as a “poor man’s” LIDAR (a tool that can be used to see and measure where things are in three dimensions)/complicated 3D camera setups which are expensive and require sophisticated calibration/post-processing analysis.
Of course, the Kinect is not a panacea: it has much more limited range, requires researchers to build their own analytical software, and the Kinect can’t do high-speed video (yet). But, because of its much lower price, its size, and the availability of drivers because of the active Kinect hacking/DIY community (and the support that even Microsoft is providing for people using Kinect beyond gaming), a number of researchers have decided to embrace the Kinect as a scientific tool.
The article profiles two potential use cases which only begin to scratch the surface of what this technology could be capable of: mapping meltwater lakes that form on top of glaciers (see images below) and studying small body impacts in space.
But, potentially the most valuable use of Kinect? As the Wired article puts it:
The Kinect’s best asset may be that it inspires students, Tedesco said. Rather than a daunting black box with convoluted cables and arcane software, the Kinect is something that many students are already familiar with.
“This creates a different mindset in students,” he said. “They’re not so scared about using the Kinect, and they can really get involved in learning and basic research.”
“I’m actually on my way to buy two of them right now,” he added.
I recently came back from a great two week trip to China and Japan. Because I needed an international phone plan/data access, I ended up giving up my beloved DROID2 (which lacks international roaming/data) for two weeks and using the iPhone 4 my company had given me.
Because much has changed in the year and a half since I wrote that first epic post comparing my DROID2 with an iPhone 4 – for starters, my iPhone 4 now runs the new iOS 5 operating system and my DROID2 now runs Android 2.3 Gingerbread — I thought I would revisit the comparison, having had over a year to use both devices in various capacities.
Long story short: I still prefer my DROID2 (although to a lesser extent than before).
So, what were my big observations after using the iPhone 4 for two weeks and then switching back to my DROID2?
Cursor positioning feels a more natural on Android. I didn’t realize this would bug me until after using the iPhone for a few days. The setup: until Android’s Gingerbread update, highlighting text and moving the caret (where your next letter comes out when you type) was terrible on Android. It was something I didn’t realize in my initial comparison and something I came to envy about iOS: the magnifying glass that pops up when you want to move your cursor and the simple drag-and-drop highlighting of text. Thankfully with the Gingerbread update, Android completely closes that gap (see image on the right) and improves upon it. Unlike with iOS, I don’t need to long-hold on the screen to enter some eery parallel universe with a magnified view – in Android, you just click once, drag the arrow to where you want the cursor to be, and you’re good to go.
If I want to “share” something, any app of mine that mediates that sharing – whether its email, Facebook, Twitter, Path, Tumblr, etc – its all fair game (see image on the right). On iOS, I can only share things through services that the app I’m in currently supports. Want to post something to Tumblr or Facebook or over email in an app that only supports Twitter? Tough luck in iOS. Want to edit a photo/document in an app that isn’t supported by the app you’re in? Again, tough luck in iOS. With the exception of things like web links (where Apple has apps meant to handle them), you can only use the apps/services which are sanctioned by the app developer. In Android, apps are supposed to talk with one another, and Google goes the extra mile to make sure all apps that can handle an “action” are available for the user to choose from.To be completely fair – I don’t have the iPhone 4S (so I haven’t played with Siri), I haven’t really used iCloud at all, and the advantages in UI quality and battery life are a big deal. So unlike some of the extremists out there who can’t understand why someone would pick iOS/Android, I can see the appeal of “the other side.” But after using the iPhone 4 for two weeks and after seeing some of the improvements in my Xoom from Ice Cream Sandwich, I can safely say that unless the iPhone 5 (or whatever comes after the 4S) brings with it a huge change, I will be buying another Android device next. If anything, I’ve noticed that with each generation of Android, Android devices further closes the gap on the main advantages that iOS has (smoothness, stability, app selection/quality), while continuing to embrace the philosophy and innovations that keep me hooked.
(Image Credit – Android text selection: Android.com) (Image Credit – Android sharing: talkandroid.com)
Apologies for the lack of blogging in recent weeks – as with last year, I was recently in Asia on business and am in the process of catching up on my email backlog. Posts to come soon – I promise!
The tradition of making a wrapup blog post continues… so what did I do in 2011 as reflected by my blog posts? Well, I…
All in all, a good year
.
Happy New Year everybody! Here’s to a great 2012 and thank you from the bottom of my heart for reading (and continuing to read) my little corner on the internet!
There’s only two more days left in 2011, so time for my final paper a month post for 2011!
Like with the paper I blogged for last month, this month’s paper (from open access journal PLoS ONE) is yet again about the impact on our health of the bacteria which have decided to call our bodies home. But, instead of the bacteria living in our gut, this month is about the bacteria which live on our skin.
Its been known that the bacteria that live on our skin help give us our particular odors. So, the researchers wondered if the mosquitos responsible for passing malaria (Anopheles) were more or less drawn to different individuals based on the scent that our skin-borne bacteria impart upon us (also, for the record, before you freak out about bacteria on your skin, remember that like the bacteria in your gut, the bacteria on your skin are natural and play a key role in maintaining the health of your skin).
Looking at 48 individuals, they noticed a huge variation in terms of attractiveness to Anopheles mosquitos (measured by seeing how much mosquitos prefer to fly towards a chamber with a particular individual’s skin extract versus a control) which they were able to trace to two things. The first is the amount of bacteria on your skin. As shown in Figure 2 below, is that the more bacteria that you have on your skin (the higher your “log bacterial density”), the more attractive you seem to be to mosquitos (the higher your mean relative attractiveness).
The second thing they noticed was that the type of bacteria also seemed to be correlated with attractiveness to mosquitos. Using DNA sequencing technology, they were able to get a mini-census of what sort of bacteria were present on the skins of the different patients. Sadly, they didn’t show any pretty figures for the analysis they conducted on two common types of bacteria (Staphylococcus and Pseudomonas), but, to quote from the paper:
The abundance of Staphylococcus spp. was 2.62 times higher in the HA [Highly Attractive to mosquitoes] group than in the PA [Poorly Attractive to mosquitoes] group and the abundance of Pseudomonas spp. 3.11 times higher in the PA group than in the HA group.
Using further genetic analyses, they were also able to show a number of other types of bacteria that were correlated with one or the other.
So, what did I think? While I think there’s a lot of interesting data here, I think the story could’ve been tighter. First and foremost, for obvious reasons, correlation does not mean causation. This was not a true controlled experiment – we don’t know for a fact if more/specific types of bacteria cause mosquitos to be drawn to them or if there’s something else that explains both the amount/type of bacteria and the attractiveness of an individual’s skin scent to a mosquito. Secondly, Figure 2 leaves much to be desired in terms of establishing a strong trendline. Yes, if I squint (and ignore their very leading trendline) I can see a positive correlation – but truth be told, the scatterplot looks like a giant mess, especially if you include the red squares that go with “Not HA or PA”. For a future study, I think it’d be great if they could get around this to show stronger causation with direct experimentation (i.e. extracting the odorants from Staphylococcus and/or Pseudomonas and adding them to a “clean” skin sample, etc)
With that said, I have to applaud the researchers for tackling a fascinating topic by taking a very different angle. I’ve blogged before about papers on dealing with malaria, but the subject matter is usually focused on how to directly kill or impede the parasite (Plasmodium falciparums). This is the first treatment of the “ecology” of malaria – specifically the ecology of the bacteria on your skin! While the authors don’t promise a “cure for malaria”, you can tell they are excited about what they’ve found and the potential to find ways other than killing parasites/mosquitos to help deal with malaria, and I look forward to seeing the other ways that our skin bacteria impact our lives.
(Figure 2 from paper)
Paper: Verhulst et al. "Composition of Human Skin Microbiota Affects Attractiveness to Malaria Mosquitoes." PLoS ONE 6(12). 17 Nov 2011. doi:10.1371/journal.pone.0028991
I took advantage of this past holiday weekend by catching up on some reading: in particular, I finished a book by Richard A. Gabriel on a childhood hero of mine: Hannibal – The Military Biography of Rome’s Greatest Enemy (also available on Google Books)
Quick primer for those of you not in the know/not as enthusiastic about Hannibal as I am
: the Carthaginian general Hannibal fought in the Second Punic War – the second of three major wars between the two great Mediterranean powers of their day: Rome and Carthage. These wars were among the first true “world wars” that the world saw – in terms of bringing great powers to war and in terms of sheer devastation of life and property– and set the stage for Rome to eventually take over the entire Mediterranean.
So, why is Hannibal a childhood hero of mine? Well:
I’ll admit, its not the most kid-friendly hero to have
but when it came down to it, I was amazed by his life. It takes uncanny ability, stamina, and boldness to be able to operate within enemy territory for 15 years and still win victory after victory.
Its with that enthusiasm that I picked up Gabriel’s book. While I think it’s a wonderful book for anyone who is deeply interested in Hannibal and military history (like your humble blogger), this is not really a biography intended for popular consumption. The book should really be thought of as an academic close read of the works of Livy and Polybius, the two Romans who wrote the most detailed account of the Second Punic War – pointing out where Livy/Polybius’s nationalism or their lack of attentiveness to detail probably led to inaccurate or revisionist accounts of what happened. Its in those moments that the author is simultaneously the most compelling (as Gabriel clearly shows off his amazing knowledge of military history and of the ancient world) and also the most frustrating (as it interferes with the narrative of Hannibal’s life in the name of the academic purpose).
With that said, ancient/military history buffs will appreciate the attentiveness to detail from the author (and his dismantling of many commonly held beliefs about Hannibal’s failure such as the lack of naval control/siege equipment), and Hannibal devotees (which may just be me
) will appreciate the author’s almost stream of consciousness way of describing what must have been going through Hannibal’s head as he made decision after decision.
In particular, Gabriel’s dissection of why Hannibal was doomed to failure was very compelling. To Gabriel, Hannibal made a number of key mistakes. First, he did not understand that Rome did not view war the way that the Greeks did – where a large defeat or two on the battlefield would lead to one side capitulating – Rome viewed war as a life or death situation – there was no room for negotiation unless they were winning and there was no room for capitulating. Period. Secondly, he did not understand that he was just one front of a grander geopolitical chess game between Carthage and Rome: Carthage was not especially interested in Italy (it would never realistically be able to hold its territory there even if it gained it), it was interested in preserving its holdings in Spain and in the islands of the Mediterranean. It was those two errors which doomed Hannibal to failure especially once Rome realized it could not keep throwing legion after legion at Hannibal and waged a war of attrition.
So, ultimate verdict: this is great if you’re a military history buff or really want to get into the details of Hannibal’s exploits, but there are likely much more accessible reads if you just want to learn a bit more about Hannibal’s life/Punic Wars.
A few years ago, I blogged about an ingenious crowdsourced game called Fold.It. The concept was pretty simple:
The result was a nifty little game which contributed findings which have made it, to date, into a number of peer-reviewed publications (see PNAS paper here and Nature Structure & Molecular Biology paper here)!
Well some researchers at McGill University in Canada want to take a page out of this playbook with a game they built called Phylo (HT: MedGadget) to help deal with another challenging issue in bioinformatics: multiple sequence alignment. In a nutshell, to better understand DNA and how it impacts life, we need to see how stretches of DNA line up with one another. Now, computers are extremely good at taking care of this problem for short stretches of DNA and for “roughly” aligning longer stretches of DNA – but its fairly difficult and costly to do it accurately for long stretches using computer algorithms.
People, however, are curiously intuitive about patterns and shapes. So, the researchers turned the multiple sequence alignment problem into a puzzle game they’ve called Phylo (see image below) where the goal is to line up multiple colored blocks. Players tackle the individual puzzles (in a browser or even on their mobile phone) and the researchers aggregate all of this into improved sequence alignments which help them better understand the underlying genetics of disease.
And how has it been doing? According to the McGill University press release:
So far, it has been working very well. Since the game was launched in November 2010, the researchers have received more than 350,000 solutions to alignment sequence problems. “Phylo has contributed to improving our understanding of the regulation of 521 genes involved in a variety of diseases. It also confirms that difficult computational problems can be embedded in a casual game that can easily be played by people without any scientific training,” Waldispuhl said. “What we’re doing here is different from classical citizen science approaches. We aren’t substituting humans for computers or asking them to compete with the machines. They are working together. It’s a synergy of humans and machines that helps to solve one of the most fundamental biological problems.”
With the new games and platforms, the researchers are hoping to encourage even more gamers to join the fun and contribute to a better understanding of genetically-based diseases at the same time.
Try it out – I have to admit I’m not especially good with puzzle games, so I haven’t been doing particularly well, but the researchers have done a pretty good job with the design of the game (esp. relative to many other academic-inspired gaming programs that I’ve seen) – and who knows, you might be a key contributor to the next big drug treatment!
As a nerd and a VC, I’m very partial towards “enabling technologies” – the underlying technology that makes stuff tick. That’s one reason I’m so interested in semiconductors: much of the technology we see today has its origins in something that a chip or semiconductor product enabled. But, despite the key role they (and other enabling technologies) play in creating the products that we know and love, most people have no idea what “chips” or “semiconductors” are.
Part of that ignorance is deliberate – chip companies exist to help electronics/product companies, not steal the spotlight. The only exception to that rule that I can think of is Intel which has spent a fair amount over the years on its “Intel Inside” branding and the numerous Intel Inside commercials that have popped up.
While NVIDIA has been good at generating buzz amongst enthusiasts, I would maintain that no other semiconductor company has quite succeeded at matching Intel in terms of getting public brand awareness – an awareness that probably has helped Intel command a higher price point because the public thinks (whether wrongly or rightly) that computers with “Intel inside” are better.
Well Qualcomm looks like they want to upset that. Qualcomm make chips that go into mobile phones and tablets and has benefitted greatly from the rise in smartphones and tablets over the past few years, getting to the point where some might say they have a shot at being a real rival for Intel in terms of importance and reach. But for years, the most your typical non-techy person might have heard about them is the fact that they have the naming rights to San Diego’s Qualcomm Stadium – home of the San Diego Chargers and former home of the San Diego Padres.
Well, on December 16th, in what is probably a very interesting test by Qualcomm to see if they can boost the consumer awareness of the Snapdragon product line they’re aiming at the next-generation of mobile phones and tablets, Qualcomm announced it will rename Qualcomm Stadium to Snapdragon Stadium for 10 days (coinciding with the San Diego County Credit Union Poinsettia Bowl and Bridgepoint Education Holiday Bowl) – check out the pictures from the Qualcomm blog below!
Will this work? Well, if the goal is to get millions of people to, overnight, buy phones with Snapdragon chips inside – the answer is probably a no. Running this sort of rebranding for only 10 days for games that aren’t the SuperBowl just won’t deliver the right PR boost. But, as a test to see if their consumer branding efforts raises consumer awareness about the chips that power their phones, and potentially demand for “those Snapdragon watchamacallits” in particular? This might be just what the doctor ordered.
I, for one, am hopeful that it does work – I’m a sucker for seeing enabling technologies and the companies behind them like Qualcomm and Intel get the credit they deserve for making our devices work better, and, frankly, having more people talk about the chips in their phones/tablets will push device manufacturers and chip companies to innovate faster.
I mentioned a couple of months ago my recent “conversion” to the tablet: how I am now convinced that tablets are more than just a cool consumer device, but represent a new vector of compute power which will find itself going into more and more places.
One particular use case which fascinated me was in the non-consumer setting, what is mostly “fresh territory” for tablet manufacturers to pursue. But, whereas most manufacturers — like Lenovo and Toshiba — are taking on the non-consumer setting by chasing the traditional enterprise technology market, Motorola Solutions, which was spun out from the original Motorola alongside (but separate from) the consumer-oriented Motorola Mobility which was recently acquired by Google — they build things like hardware/IT systems for businesses and governments, has taken a much more customized approach (HT: EETimes) which really embodies some of the strengths of the Android approach.
Instead of building yet another Android Honeycomb tablet, Motorola Solutions has built a ruggedized Android tablet called the ET1 (Enterprise Tablet 1 – hey, they sell mainly to industrial and government customers where you don’t need catchy names
), with the emphasis on the word “ruggedized”. Yes, it has a 7” touchscreen, but this really wasn’t meant for casual consumer use at home: its meant to be used in the field/factory setting, built with a strengthened case and Gorilla Glass screen (so that it can survive drops/spills/impacts), support for external accessories (i.e. barcode scanners, printers, holsters/cases), a special hot-swappable rapid charge battery pack so that you can re-juice the device without interrupting the device function, and a “hardened” (translation: more secure by stripping out unnecessary consumer-oriented capabilities) Android operating system with support for rapidly switching between multiple user profiles (because multiple employees might use the same device on different shifts).
Will this device be a huge success? Probably not by any consumer electronic manufacturer’s metric. After all, the tablet isn’t meant for consumers (and won’t be priced that way or sold through stores/consumer eCommerce sites). But, that’s the beauty of the Android approach. If you’re not building a consumer tablet, you don’t have to. In the same way that Android phone manufacturers/software developers can experiment with different price points/business models in Africa, manufacturers can leverage (and customize) Android to target different use models and form factors entirely to satisfy the needs of specific market segments/ecosystem players, taking what they need and changing/removing what they don’t. I don’t know for sure what Motorola Solutions is aiming to get out of this, but maybe the goal isn’t to put as many of these devices out there as possible but simply to add a few key accounts with which to sell other services/software. I have no idea, but the point is that an open platform lets you do things like this. Or, to put it more simply, as I said before about Linux/Android: “go custom or go home”.