Theo Gress

<figure class="wp-block-image is-resized">
 <img alt="spot tang" class="wp-image-125939 gcloudimg" data-attachment-id="125939" data-comments-opened="1" data-image-meta='{"aperture":"2","credit":"","camera":"moto z3","caption":"","created_timestamp":"1549483282","copyright":"","focal_length":"3.75","iso":"679","shutter_speed":"0.066666666666667","title":"","orientation":"1"}' data-image-title="spot tang" data-recalc-dims="1" height="575" src="https://storage.googleapis.com/microcosmosdelta.appspot.com/images/transfer_125934/spot-tang.jpg" width="571"/>
 <figcaption>
  Spot on tangerine skin
 </figcaption>
</figure>
<figure class="wp-block-image is-resized">
 <img alt="orange skin tang" class="wp-image-125938 gcloudimg" data-attachment-id="125938" data-comments-opened="1" data-image-meta='{"aperture":"2","credit":"","camera":"moto z3","caption":"","created_timestamp":"1549482317","copyright":"","focal_length":"3.75","iso":"50","shutter_speed":"0.0021978021978022","title":"","orientation":"1"}' data-image-title="orange skin tang" data-recalc-dims="1" height="583" src="https://storage.googleapis.com/microcosmosdelta.appspot.com/images/transfer_125934/orange-skin-tang-.jpg" width="574"/>
 <figcaption>
  Orange/ ripe part of tangerine skin
 </figcaption>
</figure>
<figure class="wp-block-image">
 <img alt="green skin tang" class="wp-image-125937 gcloudimg" data-attachment-id="125937" data-comments-opened="1" data-image-meta='{"aperture":"2","credit":"","camera":"moto z3","caption":"","created_timestamp":"1549483116","copyright":"","focal_length":"3.75","iso":"230","shutter_speed":"0.033333333333333","title":"","orientation":"1"}' data-image-title="green skin tang" data-recalc-dims="1" src="https://storage.googleapis.com/microcosmosdelta.appspot.com/images/transfer_125934/green-skin-tang.jpg"/>
 <figcaption>
  Green/ not ripe part of tangerine skin
 </figcaption>
</figure>
<p>
 When picking tangerines on the Stanford campus I noticed
That some of the fruits had a few little black spots on their skin. I wondered
what these spots were and decided to look at them with my foldscope. I picked
and saved a tangerine with a spot until I had time to prepare a slide and look
at very thin cross sections of the skin. I used a very razor to get thin enough
sections. Shown in the pictures are the black spot, skin of the tangerine that
was orange (ripe), and a part that appeared green (not ripe). What surprised me
most was the shape of the spot. It is not round or uniform which makes me think
it is some type of microorganism. Could it be related to the fungus that causes
black spot in roses? I doubt it because The spot was very small, 2 mm maximum.
But its was not dirt because it did not rub off and was noticed when the
tangerine was still on the tree. In addition, I show the difference Between ripe
and not ripe tangerine skin. The main difference I notice is that the cell
outlines are clearer in the ripe skin picture. There may be a better-defined
pattern in ripe tangerine skin.
</p>


Spot on tangerine skin: Bio60_2019

<p>
 I was thinking about what things are semitransparent that might look cool under a microscope. Sitting at my desk I remembered that tissues are made up of 2 sheets of cloth, hence 2 ply, and that 1 sheet is thin enough to view with a foldscope.  So, I tore the a clean tissue in order to separate the 2 pieces of cloth. Then I tore a section of cloth from one sheet small enough to put the one layer on a microscope slide. The picture does not do justice to what I observed. The threads have no obvious pattern and are anything but straightly aligned. They instead wind around each other with no apparent order. To get a better picture it is easy to prepare the slide yourself. Tip to focus on this specimen i had to squeeze the focus slider. This is probably why i couldn’t get a good picture.
</p>


Theo Gress

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Spot on tangerine skin: Bio60_2019

Kleenex Tissue Bio60_2019

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Foldscope Lens Magnification