Author Archives: Alison

Plants in motion

From Science, May 27, 2005, an intriguing article on “Physical Limits and Design Principles for Plant and Fungal Movements” (Jan M. Skotheim, L. Mahadevan). Most plants move slowly; some move swiftly – Hura crepitans shoots out seeds at up to 70 m/s, Venus flytrap catches insects in ca 0.2 s, and the fungus Dactylara brochopaga swells to trap nematodes in 0.1 s. Other examples of quick-moving plants: the fungus Philobulus, Catasetum orchids and Stylidium triggerplants, Mimosa. The plants exploit the large internal pressure (turgor) that having a cell wall allows them to have, and motion is determined by the rate of fluid transport. The authors publish a colorful plot of time scale versus the smallest macroscopic dimension of the moving part, and group the types of movements into swelling/shrinking (durtion limited by fluid transport), snap-buckling, and explosive fracture, the latter two being a result of elastic instabilities. The biggest, fastest movements are made by Hura crepitans, and Eclallium elaterium – if I’m reading the colours on the chart right, and they’re less than 10 mm in 0.001 – 0.0001 s, which alas means all our favourite big nasty plants fall in the section of the plot marked “Physically impossible movements”, at least if they’re restricted to using water pressure. The authors contrast the Venus flytrap (0.2 s) and Aldrovanda (0.02 s): an Aldrovanda leaf is about 1/10th the size of a Venus flytrap leaf, which should translate to about 100 times the speed, but the design of the Venus flytrap leaf includes a reversal of curvature and a snap. If you want to see pictures, then the (unrelated) site Plants in Motion has Quick Time movies of a Venus flytrap closing, and a Mimosa leaf curling up like a blind when the tip is warmed.

Westercon, second day and after

Somehow I managed to produce my last post in triplicate; serves me right for messing with the template, trying to contribute to the Technorati thread on Westercon.

Second day (yesterday) consisted of 3 panels sat on, none listened to, two books bought, one bank found, one old stamping ground revisited. The first panel was “Part time writer”, four writers, all from BC (does that says something about BC funding for the arts, BC writers, or simply about the networks) talking about writing when you have a full-time day-job (the basic condition of the majority of writers, since as Derryl Murphy pointed out, the mean annual income of SFWA members from their writing was in the $2000-$3000 range). The panelists were Derryl Murphy, whose first short story collection Wasps at the Speed of Sound is just out; Nina Munteanu; and Mark Anthony Brennan, and myself). Discussion ranged over how to make the switch from daytime work to nighttime work, how to recharge oneself, writing every day versus writing in bursts, how the daytime work fed into the nighttime work, Canada Council Grants, writer’s retreats, protecting time and space, the freedom to be noncommercial vs the risks of being noncommercial.

[Continued, August 21] The next panel was Earth as a Model for Other Planets, which went in unexpected directions. I should have read the panel description a touch more carefully, to realize that it specificially evoked prehistory as a model. I came prepared to look sideways; however co-panellists were Blair Peterson, James C. Glass and Larry Niven, and we got all the way down to the molecular, discussing the properties of water in supporting life, as well as back to Snowball Earth.

Making a Human Alien (third day) was another strong panel that covered a lot of ground. Memory’s a little foggy, but I think the roster was Danita, Blair, Kathryn Myronuk, and Hayden Trenholm, all of whom came with background in genetics, medicine, or policy, and all of whom came at the idea of human bioengineering from different directions – feasibility, vs. lack of feasibility, individual procreative choice vs. social good. Much of the discussion took on a technical feasibility vs. post-9/11 paranoia theme: Would the need to experiment and cull – acceptable in plants, unacceptable in humans – restrict the rapid implementation of these methods in humans, or would cheap and rapidly automated biotechnology land us in a scenario similar to what we are seeing today with the internet and computer viruses, with biohackers, bioterrorists, and garage virus engineers rampant?

On the Monday I managed to pause in my social whirl and attend two panels, the first being the future of Tor books, and the second the alternative energy panel. I made it in time to hear the last three paragraphs of Dave Duncan’s reading.

Getting from here to there

At some point today I was ruminating upon the extraordinary rise and diffusion of first the personal computer and then the internet over the last 20 years and wondering if there might be an equivalent in energy generating technology that could be so universally adopted. If that were so, if we had an energy technology ‘killer ap’, we might have a chance of quickly displacing the ‘killer ap’ of three generations ago – so widely and easily adopted that it transformed society, geography, and now the climate – and making a relatively painless transition to a sustainable energy economy.

But it seems we don’t. Most balanced analyses conclude that no single technology is going to replace the current abundance of cheap fossil fuel that we have come to regard as our birthright. (The tenor of most commentaries on the cost of energy is outrage, though it did occur to me to wonder what right we have to expect energy to be cheap? Except our economy is predicated upon it.). Not only do we need to build the technology and infrastructure to support sustainability but we need to dismantle the technology and infrastructure (and expectations and tax structures) that support unsustainability. It is a massive undertaking, and I suspect that something disastrous will have to happen, not once but repeatedly (how quickly, for instance, has popular awareness of the Asian Tsunami faded), before there is suddenly a ‘war on global warming’ and a ‘war on energy waste’ and the money and will are found for radical restructuring of everything from policy to lifestyle.

I had two glimpses into sustainable possibilities recently, in Amsterdam. Amsterdam itself, at least to a credulous tourist eye, has not surrendered to the automobile; if anything ruled supreme, it was the fleets and fleets of sit-up-and-beg bicycles of a style I hadn’t seen since WWII movies. Bicycle theft is so rampant that everyone ‘dresses down’ in town. Everyone cycles: men in suits, women in skirts, parents with small children perched on their handlebars, large and larger children, not a stitch of lycra or indeed a bicycle helmet to be seen. Every ‘street’ is a canal, with a single lane of parking on either side, a single lane of traffic (both directions), a cycle-pedestrian pavement protected by metal posts, and then the tall, narrow, forward-tilting row houses. There is nowhere for the roads to expand. Morning traffic on those single-lane streets proceeds by delicate negotiation between delivery vans and traffic, with motorists nudging their way towards their destination while the bicycles stream by.

The other was the book I took with me, Kim Stanley Robinson’s Pacific Edge. It’s the third book of his Three California’s trilogy, after the post-apocalyptic The Wild Shore and the dystopic The Gold Coast (which is actually my favourite of the three). Pacific Edge portrays the small, sustainable, intensely local lives of a California community in 2065, sixty-odd years after the work of dismantling the infrastructures supporting the crumbling instutions of the twentieth century began. It’s a blueprint for a sustainable community, with human physical labor supported by a subtly advanced material science. What is not part of the book (because it was not the book that Robinson intended to write, note!) is the long struggle towards its realization.

Doing the garden

"Websites are like gardens," wrote the BMJ’s Richard Smith. "Turn your back on them
for a few weeks and they’re overrun with weeds in the form of out of
date coming events and hypertext links leading nowhere." It’s been rather longer than a few weeks, but I’m finally knuckling down to do some gardening over at my SFF site, to update the style of the website, and to consolidate and update all the various pages I have written over the years and still consider fit to print. It was actually 1997 that I applied myself to finding out what HTML was all about, perusing books on HTML in the reading room of the alas-now-closed National Science Library of Edinburgh, and built my first web-page, with the help of my notes and the NCSA’s classic "Beginner’s Guide to HTML", so that almost qualifies me as a senior netizen. The growth of technologies and creativity has been extraordinary – I certainly can’t claim to have kept up. Unfortunately, corruption, exploitation and pollution have also grown apace, but that’s a topic for another post.