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Saturday, March 25, 2017

GALAPAGOS PILGRIMAGE - PART TWO

SEEING THINGS

Finch on San Cristobal

Finch on Isla Espanola
The finches didn't really make an impression on Darwin. He didn't, at first, notice that the finches in his collection were different from each other until long after he left the Galapagos. When the realization finally came to him, his notes were inadequate for matching each sample to its island. It raises the question, "What are you uniquely qualified for and prepared to discover?"


Mitchell: So, uh... so, how go the repairs?
Lee: Well, the main engines are gone, unless we can find some way to re-energize them.
Mitchell: You better check the starboard impulse packs. Those points have about decayed to lead.
Lee: Oh, yeah, sure, Mitch.
Mitchell: I'm not joking, Lee! You activate those packs, and you'll blow the whole impulse deck.
Lee: I'll, uh, get on it right away. I just wanted to stop by and make sure you were OK. See you later.

Helmsman Gary Mitchell (Gary Lockwood) and ship's psychiatrist Dr. Elizabeth Dehner (Sally Kellerman) evolving.  Picture by Paramount Television


Mitchell: He's a fool.
Dr. Dehner: A fool?
Mitchell: He'd seen those points, and he hadn't noticed their condition.
Dr. Dehner: How do you know?
Mitchell: The image of what he'd seen was still in his mind.


Star Trek, "Where No Man Has Gone Before.
-Paramount Television
Maybe it's best to think of seeing as an interactive event. We see things, maybe every day. But then one day we look again and something finally clicks and we say, "Oh! Now I see!" or "Eureka!"

Education, experience, and familiarity all contribute to the process of seeing, which results in a gaze that can be more discriminating and more encompassing.

Suppose a photo editor needs pictures of World Foods Market on Barber Blvd. and there are two available photographers, Scott and Monkey-cam. Some background knowledge of the photographers might figure into the editor's decision about who should be assigned, depending on what the goals are for a given article.


Or say the editor needs pictures of Long Island in the middle of Willapa Bay.


Or say the editor needs pictures of 3 species tacos for an unbiased article about the best tacos in the world.


In each case, the photographer's background and life experience greatly factor into what gets noticed. I guess my point is, the hard time I did at the oligonucleotide factory changed the way I see.


Evolution of a painter


In 1994, I started working as a technician in the synthesis department of a small company that made oligonucleotides, or single-stranded DNA. There I learned that machines (reminiscent of multi-flavored Big Gulp machines) could dispense the 4 different bases (phosphoramidites dAdenosine, dCytidine, dGuanosine and Thymidine) and string them together into specific chains (or sequences) per customer request.



A bank of synthesis units
Section of an oligonucleotide — single stranded DNA
The machines don't do as good a job of making oligonucleotides as nature does. Each time a coupling happens, there are failures which, if the sequence is long, have to be removed later during a purification process.

Oligonucleotides being injected into an HPLC purification column
When that process is complete and the amidite chains are dried for shipment, the material looks something like this:


Visually represented here is enough single stranded material to fulfill a 50 nanomole order. If this particular sequence is 21 mers long (21 bases, for instance, 5'-ACT-GGC-ATA-GGA-AAA-TAT-GAT-3') then a leading manufacturer of oligonucleotides could sell you (as of this writing) an unpurified version for something like 8 - 13 dollars.

Once the customer gets their material, they may utilize it as a primer, where it enables DNA polymerase (a complicated DNA zipper) to get a running start at massively amplifying a desired DNA sequence.

A vague depiction of DNA polymerase assembling DNA according to a single-stranded template
(DNA polymerase not pictured)

The key trick is that, single stranded DNA, uncoiled and open, acts as a template that allow accurate reproduction by DNA polymerase. The polymerase reads the template, finds the complementary base (an A for a T, or a C for a G) and 'zips' them together making long double stranded molecules (or DNA proper).



This is the basis for the iconic double helix, (imagine twisting the ends of this 'ladder') a quaternary code able to store the data necessary for growing ever evolving life-forms.


This code is passed down to us from our parents, and the way it works is how a mixture of our parent's physical characteristics ultimately find expression in us.

Really long stretches of DNA are genes. Collections of genes comprise Chromosomes. Collections of chromosomes in a cell define the organism of which that cell is a part, and all the genetic information in a cell is called the genome. The human genome was not sequenced until 2001, seven years after I started working at the oligonucleotide factory.

The amazing thing we know now is that,

"...the DNA code is invariant across all living creatures, while the individual genes themselves vary...a truly astounding fact, which shows more clearly than anything else that all living creatures are descended from a single ancestor...the whole gene/protein system for running life...is the same in all animals, plants, fungi, bacteria, archaea and viruses. What varies is what is written in the code, not the code itself. And when we look comparatively at what is written in the code — the actual genetic sequences in all these different creatures — we find the same kind of hierarchical tree of resemblance."
                         - The Greatest Show on Earth, Richard Dawkins.



Now the tree of life is informed by molecular biology. I am told it closely correlates to and sometimes corrects older charts that were based on Linnaean taxonomy. (See Tree of Life Web Project: (http://tolweb.org/tree/)

Yet in 1837, Darwin, was formulating his theory, and sketching in his notebook, certain that there was a mechanism for heredity, but never knowing what it was.



1835

The Popular Science Monthly, Volume 57 p. 87, reproduction of frontispiece from Darwin, Charles (1890), Journal of researches into the natural history and geology of the various countries visited by H.M.S. Beagle etc. (First Murray illustrated edition), London: John Murray (The Voyage of the Beagle).

For an amazing depiction of life aboard a British Navy ship, see Master and Commander: The Far Side of the World. Bonus: They visit the Galapagos.
http://www.rogerebert.com/reviews/master-and-commander-the-far-side-of-the-world-2003

2016


The Nemo III


Floor plans compared


First stop: North Seymour...to be continued

If you need to catch up with Part 1: https://thenarrativeimage.blogspot.com/2017/03/galapagos-pilgrimage-part-one.html

PART THREE: The Book of Nature is now available:
https://thenarrativeimage.blogspot.com/2017/04/galapagos-pilgrimage-part-three-book-of.html

3 comments:

  1. This is a comment for part 1 of your Galapagos epic. Forgive me for not commenting on your existential angst theme but I have some questions about your "whole foods market" picture. 1. They sell PBR there? and 2. I know what Domestic beer is but what is "Domistic" beer?
    your Podnah,, Fescue Tallgrass

    ReplyDelete
  2. Dear Fescue,

    That’s WORLD Foods Market, not Whole Foods Market. Granted, it’s a subtle difference, but one that might be obvious to someone observant enough to spot the difference between ‘domestic’ and ‘domistic’. Perhaps domistic is just a spelling error by someone who speaks multiple languages and also likes to help direct customers with large clear, home-made signs in a structured, ordered environment.

    After I read your comment, I looked up ‘Existential Angst’ (again) and began questioning my identity as a writer. The theme I really want to express is that the methods of science are our best chance at discovering what is real or true.

    I’ll try to do better.

    ReplyDelete
  3. Well excuse me Michio Kaku, reckon I saw the PBR and got excited.... Patrol Boat, River.....Professional Bull Riding....Pabst Blue Ribbon...Boy Howdy! either that or you edited "Whole" to "World" after the fact to make me look like some kind of yahoo....anyway, they may have been trying to spell "DoMystic" (beer)....which I would try...with them 3 species tacos you fellahs make. Fescue

    ReplyDelete

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