EPOD - a service of USRA

The Earth Science Picture of the Day (EPOD) highlights the diverse processes and phenomena which shape our planet and our lives. EPOD will collect and archive photos, imagery, graphics, and artwork with short explanatory
captions and links exemplifying features within the Earth system. The
community is invited to contribute digital imagery, short captions and
relevant links.


3-D View of DNA

January 20, 2023


DNA _ stereo card _Forums

Photographer: Greg Parker

Summary Author: Greg Parker

Featured above is a 3-D view ( stereograph) of 2 and a half turns of
the DNA molecule. I put together this 3-D model from a
Cochranes of Oxford kit, and Dr. Brian May created the
stereograph – in mid-December of 2022. A DNA molecule consists of two
long polynucleotide strands or chains made up of four types of
nucleotide subunits. Each such molecule contains the biological
information responsible for making every species unique.

You can view the stereograph by:
1. Using the Cross-Eyed method
2. Using 3D prism glasses
3. Using B rian May’s OWL Stereoscope



Related EPODs

3-D View of DNA White Underwing Moth Web of the Orb Weaver
Spider Detailed Image of Dragonfly Eye Fossil Find in
Sangiovannulo, Sicily Black Widow Spider
More...

Animal Links

* Animal Diversity Web
* ARKive
* BirdLife International
* Bug Guide
* Discover Life
* Integrated Taxonomic Information System
* Microbial Life Resources
Earth Science Picture of the Day is a service of the
-
Universities Space Research Association.

https://epod.usra.edu

--- up 46 weeks, 6 days, 21 minutes
* Origin: -=> Castle Rock BBS <=- Now Husky HPT Powered! (21:1/186)

EPOD - a service of USRA

The Earth Science Picture of the Day (EPOD) highlights the diverse processes and phenomena which shape our planet and our lives. EPOD will collect and archive photos, imagery, graphics, and artwork with short explanatory
captions and links exemplifying features within the Earth system. The
community is invited to contribute digital imagery, short captions and
relevant links.


Spiral Pattern on an Icy Puddle

February 22, 2023

Ice spiral

Photographer: Mark Hendrickson

Summary Authors: Mark Hendrickson; Jim Foster

I’ve have seen concentric ice rings in puddles, but this is the
first true spiral I’ve observed. This photo was taken about 17 miles
(27 km) northeast of Payson, Arizona on January 21, 2023. The overnight
low was 18ºF (-8 C), and at the time of the photo the temperature had
climbed to 28ºF (-2 C). The surface of the puddle was about 2 ft (.6 m)
across and was completely frozen. It's very likely that the ice didn't
reach the bottom of this little puddle.

A number of factors can lead to odd patterns on icy surfaces. Note
the fractures (white lines) in the ice at left, in the only ring not
part of the spiral formation. The next ring starts the actual spiral.
So, it seems that there was an initial sheet across the puddle, and
when the ice became sufficiently thick (perhaps a few mm) only one more
crack formed. With just a single crack, as the water beneath
transferred to the ice and shrunk (contracted) toward the center, the
crack grew and spiraled inward. However, exactly how these spirals
formed is still a bit of a mystery. Thanks to Steven Arcone and Doug
Stith for their help with this.


Payson, Arizona Coordinates: 34.2309, -111.3251


Related EPODs

Spiral Pattern on an Icy Puddle Winter’s Black and White — and
Gray — World Pearl Necklace or Frozen Spiderweb? Fernlike Snow
Crystal Frost Crack in Linden Tree Triboluminescence Observed
on Perito Moreno Glacier
More...

Cryosphere Links

* Guide to Frost
* What is the Cryosphere?
* Bentley Snow Crystals
* Glaciers of the World
* Ice, Snow, and Glaciers: The Water Cycle
* The National Snow and Ice Data Center Google Earth Images
* Snow and Ice Crystals

-
Earth Science Picture of the Day is a service of the Universities
Space Research Association.

https://epod.usra.edu

--- up 51 weeks, 2 days, 21 minutes
* Origin: -=> Castle Rock BBS <=- Now Husky HPT Powered! (21:1/186)