Mar 23

On Sunday, I noticed that the ocotillo in my parents’ front yard was bare at the base and full of leaves at the tips. I proceeded to take pictures and created the “Efficiency in Desert Plants” blog post.

Yesterday (Monday), on my way to school, I noticed that ocotillos in the desert were completely covered in green leaves. I immediately thought that I needed to take pictures of these to serve as controls against my hypothesis.

This morning, before my morning walk, I noticed the ocotillo across the street. It get sunlight ALL DAY and it looks just like the ocotillos in the desert I observed yesterday.

neighbor 1

neighbor 1

neighbor 2

neighbor 2

Scientific Study

  1. First there needs to be reading to see if an explanation can be found for this occurrence in ocotillos (not general information that says that plants bloom when they receive more sunlight)
  2. Field tests can then be done in the desert where ocotillos are observed in different places (in 100m x 100m areas) – an area is combed and only those of a certain height and taller are counted, then we’d get a ratio between those are that full of leaves and those that only have leaves in certain parts (as was seen in my parents’ ocotillo

I’m almost certain that they do not grown in the shade naturally. And the only reason that the one in my parents’ front yard exists is that it was planted there.

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Mar 22

It’s the first day of spring. That means that flowers will soon bloom, and in dessert environments like the one that I live in, it means that leaves will once again bloom.

This morning, I noticed something VERY particular. An ocotillo tree in my parents’ front yard is now growing green leaves. The house provides shade for most of the plant but in the morning hours, the tips of the ocotillo plant are exposed to sunlight. Then, later in the day, these same points and the rest of the plant are exposed to the afternoon sun.

The ocotillo is only growing leaves in the parts that receive sunlight from morning to afternoon! I guess is that it is for efficiency. Why have leaves where there is less sun? So it will probably populate the tips first and then grow leaves as it needs them.

Why do I think this?
Photosynthesis occurs in leaves. It is in the leaves’ stoma that CO2 is taken up from the air and O2 is released into the air so photosynthesis can occur. Water is lost during this gas exchange. Plants (especially those from that live in the desert) don’t like to lose water.

I haven’t researched WHY this happens so the above inference could be completely wrong. I just thought is was a very neat phenomena.

In these pictures, notices how the tops are green and the bottoms are fairly bare (except for the thorns which EVERY plant in the Sonoran desert has).

Ocotillo 1 Ocotillo 2
Ocotillo 3 Ocotillo 4
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Mar 20

This past week was spring break and like all careless student I spent it working. A few of the days were dedicated to helping clean up at the lung injury lab where I have volunteered for the past couple of years (I did get research credit last semester and for the current one and the letters of recommendation are awesome).

The lab is moving locations and I was in there helping to clean up. There were a lot of things that were going to get thrown away and some of these were somewhat useful/interesting to the students who were there.

One of the things that I salvaged was this 3′ 3″ x 4′ 8.5″ poster.

Yeah… I know… I’m a nerd. So this poster has the genome and it’s separated into individual chromosomes! Very, very cool if you’re into genetics or biology. I showed my girlfriend’s youngest sister and she loved it. I told her she could have it as long as she posted it on her wall.

The Human Genome Poster

The Human Genome Poster

Annotation of the Celera Human Genome Assembly

Title: Annotation of the Celera Human Genome Assembly

Title Close-up: Celera Human Genome Assembly

Title Close-up: Celera Human Genome Assembly

Zoom: Begining of Chromosome 21

Zoom: Begining of Chromosome 21

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