Category Archives: biology

Categorically Not! – Inside Out

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Paul Stein of Los Angeles PhilharmonicThe next Categorically Not! is a Blue* one! It’s on Sunday October 28th (tomorrow). The Categorically Not! series of events that are held at the Santa Monica Art Studios, (with occasional exceptions). It’s a series – started and run by science writer K. C. Cole – of fun and informative conversations deliberately ignoring the traditional boundaries between art, science, humanities, and other subjects. I strongly encourage you to come to them if you’re in the area.

Here is the website that describes past ones, and upcoming ones. See also the links at the end of the post for some announcements and descriptions (and even video) of previous events. (Above right: The Los Angeles Philharmonic’s Paul Stein demonstrating “small differences” on the violin, in the event with that theme.)

The theme this month is Inside Out Here’s the description from K C Cole: […] Click to continue reading this post →

Under the Sea

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[Post reconstruction in progress after 25.10.07 hack (body, comments and images to follow)]:

jellyfish from AP story

There’s something ever so romantic (not in the hand-holding-under-the-moon sense) about deep sea exploration. It occupies the roughly same part of one’s emotional landscape as space exploration, I think, but it’s maybe even more exciting in some ways, because there’s something about the utterly weird and unknown being just under the surface of the familiar, while space seems so far away (actually, in one sense it isn’t, if you go straight up, but in terms of logistics, it seems and is far…). It also very much has the feel of a 19th Century adventure, with explorers going off and bagging the weird and wonderful specimens to bring back for museums and entertainment. This was seldom good for the specimens involved, of course, and we […] Click to continue reading this post →

Artificial Life?

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Sheril had a post about this over on the new blog Correlations, but it is so interesting (and so potentially far-reaching) that I thought I’d point to it here too.

Craig Venter’s been at it again. This time one of his teams of scientists has apparently created a synthetic chromosome in the laboratory. As he said to the Guardian:

this landmark would be “a very important philosophical step in the history of our species. We are going from reading our genetic code to the ability to write it. That gives us the hypothetical ability to do things never contemplated before”.

[…] Click to continue reading this post →

Composing Compost: Fun with Microorganisms

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So finally I completed the project that began with the chicken wire matters I spoke of a while ago. Work and such things have a way of intervening for weeks, preventing a good idea from going from conception to completion in what should be a day or two. The plan? To stop throwing away lots of wonderful organic matter and keep it instead, turning it into compost. This makes sense because so much of my garden has rather poor soil, for a start, and for a second matter it just seems wrong to not do it. for a third, it’s fun to do experiments with some microbiology for a change. Microbiology? Well, the object of the exercise is to let nature turn any organic material that you have into compost – full of nutrients for growing new things. Compost is also good for moisture control, good drainage, and a host of other things that are beneficial to plants in the garden. How does nature do this? Bacteria, mostly. But for the bacteria and other microorganisms to do their job (digesting the material), one needs to give them good conditions to live in. Conditions involve the right amount of moisture, air, and food, and the point of my project was first to prepare containment for the compost manufacturing process, and then to prepare a good combination of raw materials, place them properly, and then leave the little organisms to their own devices to do their thing. Here’s a good webpage at Cornell about the various stages of composting, the temperatures involved, and the various organisms (bacteria of various sorts, actinomycetes (a kind of filamented bacterium), fungi (various molds and yeasts), protozoa) that come into play at the various stages.

compost projectSo, phase one: Containment. Well everything is going to be kept together with a cylinder of chicken wire, and so measurement of the desired radius [tex]r[/tex] followed by a quick computation ([tex]d=2\pi r[/tex]) to give me the length I needed to cut, and I was away. Shortly after I realised that my measurements were to be determined by the size of the mouth of the large trash bags I’d bought to add as the liner of the containment cylinder. So I ended up readjusting everything to fit that. I cut everything a bit big to allow for the overlap I […] Click to continue reading this post →

Magnetic Vision?

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garden warbler by Tommy Holden. British Trust for Ornithology websiteThis is simply fascinating. I heard about it on NPR. While it is well known that birds are sensitive to the earth’s magnetic field, and use it to navigate, apparently it’s only been recently shown that this sensitivity is connected directly to the visual system (at least in some birds). The idea seems to be that the bird has evolved a mechanism for essentially seeing the magnetic field, presumably in the sense that magnetic information is encoded in the visual field and mapped to the brain along with the usual visual data. (Image: A garden warbler, photographed by Tommy Holden. I found it on the British Trust for Ornithology website, here.)

Have a listen to the NPR interview with Henrik Mouritsen (professor of neurosensory science at the University of Oldenberg in Germany – and among other things also a keen wildlife photographer, I learned from his website), and learn more about his […] Click to continue reading this post →

ScienceWoman’s New Digs

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Just thought I’d let you know that the blog of ScienceWoman (that I talked about in an earlier post) has now moved. Her blogging about her day to day experiences and thoughts as an early career woman scientist will be getting a whole lot more attention now that it is under the ScienceBlogs umbrella. Go and have a look at her new digs. She’s already started off nicely with a post asking readers to name their favourite woman scientist, with the resulting interesting contributions and discussions you’d expect in the comments. Go and add your two cents.

While I was over at ScienceBlogs (haven’t been in a long while) I spotted a rather […] Click to continue reading this post →

They’re Out There (Probably)

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alien from the movieLet’s talk about aliens. I don’t mean people coming across the borders of whatever your country happens to be (although I did giggle a decade ago when I was given an official “alien number” by the powers that be back then – though I always regretted bypassing the “alien with extraordinary ability” status that the O1 visa gives you), I mean living creatures from beyond planet earth (it’s also interesting to consider the possibility that the seeds for life on earth may also have come from elsewhere).

It’s one of my favourite topics to consider, which is why I like to follow a lot of the remarkable things we are learning about our neighbouring planets (and other bodies like moons, asteroids, comets, and, yes minor planets like our old friend Pluto), and of course the ever-increasing variety of extra-solar planets (the ones we are discovering orbiting other stars). Overall, it gives one the sense that it is overwhelmingly likely that we are not alone (to use the tired old phrase), which to me is tremendously exciting.

I think we’ll find lots of compelling evidence that there’s lots of simple life on other bodies relatively soon, and I think that when people on the street hear of this, they’ll find it interesting enough. But I suspect that this will completely different to an […] Click to continue reading this post →

Brain Building

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homersimpson wallpaper brain from http://www.simpsonstrivia.com.arI’ve been sitting here for the whole evening building a set of slides for my talk here at the Cambridge conference (that I still have not got around to telling you about because I’ve been, well, attending it). My talk is at the start of the Wednesday session and so I’m starting early (yeah, I know) so as to build up all the introductory slides with the fancier graphics to lull the viewer into that comfort zone before bombarding them with technical results. You may well know the sort I mean.

(image above right: click-to-enlarge-able “scan” of Homer Simpson’s brain, which I got from here.)

Anyway, I was sitting here thinking that what I could really do with right now (what with the jetlag, the sitting through five one hour talks – all great) is a rapid hike up to the top of Runyon Canyon or up to the top of Mount Hollywood in Griffith Park – two of my favourite pick-me-ups (or is it picks-me-up…?). This would get the blood flowing and give me that jolt I need to stay smart and alert for a few more slides before packing in for the night (and then panicking tomorrow that I did not do enough). All of this was running through my head when an email arrived* with this article about how exercise can boost mental function – actually promote the growth of new neurons. The studies […] Click to continue reading this post →

Parthenogenesis, II

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bonnethead sharkRemember Flora? The Komodo dragon? I blogged about her here and here. She produced offspring using parthenogenesis while in captivity last year. Well, there was a news story earlier this week about a bonnethead shark in in the Henry Doorly Zoo in Nebraska giving birth to a pup. (Interestingly, zoo-keepers and news reporters seemed uninterested in giving our subject shark a name, as happened for the reptile.)

It was a puzzle for a while as to how she did it (as I learned in a BBC article):

At the time, some theorised that a male tiger shark kept at the zoo could have been the father – but the institution’s three bonnethead females had none of the bite marks that are usually inflicted on their gender during shark sex.

Some even suggested that one of the females could have had sex in the wild and stored the sperm in her body – but the three-year period in captivity made this explanation highly unlikely.

But eventually DNA tests resolved the issue:
[…] Click to continue reading this post →

Talk about the Talk

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charles stevensChuck Stevens’ visit went very well indeed. The talk was excellent, and well attended by faculty and students from both Physics and Astronomy Department, and the Neurosciences Research Institute. I’ll tell you a bit more about what he said in a subsequent post, along with pointing to video and slides from the talk, I hope. (Click on left for larger view.)

By the way, when I got to the Steve Reich concert venue, there was a huge line of people waiting to get in. They eventually turned a lot of us (myself included) away due to lack of space.

So I got on my bike and cycled rapidly up Figueroa Street to downtown and found the restaurant where some of my colleagues had taken the guest for dinner. Excellent conversation instead of excellent music. A good trade.

Here’s something I passed on the way to the restaurant. Took a picture while waiting […] Click to continue reading this post →