Linda Grashoff's Photography Adventures

iridescence

Nice Car!


May 19, 2017

Maybe you had to grow up in the Detroit area to hear boys yell that out when they saw a cool car. Probably they wouldn’t have yelled out at this one, though. I, however . . .

 


Had to Get Myself Back to the Garden 11


July 28, 2016

Remember to click the image if you want to see a larger version.

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July Iridescence 7


September 21, 2015

You can see how much Leptothrix discophora favors still river water by how it often insinuates itself in rocks that block the current.07312015 Schoepfle Garden-219


July Iridescence 6


September 14, 2015

You can see enough iridescence here for me to include this photo in the series, but what really got me was how clearly you can see the reflections of individual leaves in the water and Leptothrix discophora film.

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July Iridescence 5


September 7, 2015

Who needs opals when you can have a Leptothrix discophora film?

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July Iridescence 2


August 17, 2015

While the rainbow colors of a more mature film of Leptothrix discophora, such as the one shown in last week’s post, may be more spectacular, I think there’s also something to say for the younger, more subtle, manifestations of this iron bacterium—especially when it’s housed in attractive shale formations. In the first photo, notice how the film seems to disappear when it’s in the shadow of the piece of shale. Sometimes the film becomes invisible in the shade, and sometimes the film can be seen only if a shadow falls across it. Whaaa??? I know the visibility of these films has something to do with the angle of the sun relative to the viewer’s eyes, but the phenomenon must be more complicated.  Where is a physicist with special expertise in optics when you need one?

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Interference in Color and Life


June 20, 2015

Today’s photograph shows a biofilm of Leptothrix discophora, familiar to those of you who have followed this blog very long. I’m posting this photo today because I want to talk about interference. That’s the name for the kind of color you see here. It’s also what’s happening in my life: Interference, especially with my photography. (We’re moving and getting the house ready to sell.) I need to cut back a bit. So I’ll be posting only weekly for a while. I will miss the weekly photo shoots, the daily blogging, and your daily Likes and Comments. I  hope to pick up the pace this fall.

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Featured in Oberlin Alumni Magazine


May 18, 2015

I’m happy to report that the spring 2015 issue of the Oberlin College alumni magazine has included mention of my book, They Breathe Iron, along with two photos from the book. Something seems to have happened to the color of the photos in the online version of the magazine, so I’ll show you how the images should look:

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From the Archives 4


April 13, 2015

Here’s another 2002 photo, taken October 12 of that year, that also happens to be in They Breathe Iron. We had a drought in northern Ohio in 2002, which gave the iron bacteria a field day—many field days. This is because the rains didn’t disperse the bacteria and wash them downstream, so their colonies could grow to (in my eyes) wonderful proportions. This is the iridescent film of the iron bacterium Leptothrix discophora.

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