Some of you may be asking, “Where, oh where, has GoCorral gone? Where is the weekly update of his blog? There hasn’t even been a picture of his toenails to tell us he’s still alive!”
Well, I am still alive, I’ve just been rather busy with school these last few days.
Among my many responsibilities I have had:
1. A massive final project on homologous genes to the C. elegans myosin gene, unc-54, that is rapidly approaching 50 pages in length.
2. A final paper on intron retention being the first sign of speciation.
3. Scheduling and preparing my thesis proposal presentation.
4. Grading essays for the basic biology class I am teaching this semester.
5. All the usual stuff I have to do.
I’m keeping a good handle on #1 and #5. #4 is a slow truck that keeps on going.
Due to all the other stuff I’ve been doing #2 did not turn out as good as I would’ve liked. I loved the thesis of that paper, but I wish I’d used more time to find additional supporting evidence and described the supporting evidence in a better fashion.
#3 is the most exciting one! My thesis proposal presentation happened on Friday and was probably the most important moment in my career up to this point.
I got super nervous before giving the presentation and made a few mistakes in the preparation and delivery, but it still went quite well.
I passed the proposal which means I can continue on with my project! Woohoo! I do have to update my abstract to reflect my definite research goals which were outlined in the meeting.
That’s what I’ve been up to. There’s still more to do! I predict I’ll be done with most of it by the end of next week. After that, regular blog updates will resume.
I did some cool stuff last semester in my science classes that I’d like to show you guys.
The gist of it is… This picture:
This is a picture taken by my lab group in my basic lab technique class last semester of a mouse fibroblast cell moving into a simulated wound on a glass slide.
Fibroblast cells are kind of like the contractors of your body when you get a scratch or wound. There are your first responders to the “disaster,” your immune system, and then fibroblasts go in to start the process of rebuilding your tissue by laying the foundation for other cells to move in.
A lot of scientists are interested in wound healing. How can we make it faster? How can we make it better so people don’t have lingering problems after the superficial injury has healed? How can we prevent infection? How can we prevent scarring?
Those questions are tested with a variety of experiments but one of the msot common is the scratch assay.
A bunch of fibroblasts are grown on a glass slide until they practically cover it. Then the slide is scratched.
The fibroblasts move into the scratch, thinking it is a wound. Their movement into the scratch is measured in a couple different ways and those measurements can tell us a little bit more about how wounds heal.
Which brings me back to the picture my lab group took. Obviously its got a lot of color and is very prety, but what are all those colors? What’s going on in that picture?
My lab group scratched the space above the big cell in teh picture. The cell is now moving into the scratch.
The red lines are called actin. Actin is the support structure of your cells. Cells move by extending actin filaments where they want to go and breaking them down behind them.
The green parts are called vinculin. Vinculin is spread throughout the cell and localizes into spots where the cell is attached to a surface to assist in adhereing to that surface. All those bright green spots are where the vinculin is helping the cell hold onto the glass slide.
The blue parts are cell nuclei. Each cell has one nucleus and I’ll bet you can pick out the one that belongs to all the actin and vinculin in the middle of this picture.
I did a lot more stuff on scratch assays in this class and leaarned a few new techniques, but the best part was definitely getting this picture.
Oh and apologies to any color blind people. I have no idea how to spearatae out the red and green things for you. Enjoy!
While letting myself into my lab a woman approached me and said, “Hi!”
She had just graduated UC Davis and was looking around all the buildings she hadn’t been in much.
She was a Landscape Architecture major (didn’t even know you could major in that). My building is for biological sciences, so its understandable that she had probably never set foot in it before.
My lab’s building, Briggs Hall, is interesting from an architecture perspective (but maybe not landscape architecture).
The building was built in 1971 when there were a lot of campus demonstrations (still are! Pepper Spray Cop was at UC Davis).
A method of cutting down on demonstrations was giving students no places to gather indoors. Thus Briggs Hall’s layout is amazing confusing and even I get lost in it after working in the building for several years.
Briggs also doesn’t have any staircases inside. All of the stairs are on the exterior of the building. Don’t ask me what lunatic decided that was a good idea for a four story building.
Anyways, the recently graduated student asked if there was anything interesting in Briggs.
I showed her my lab. She glanced around in it, but not being a biologist she didn’t really understand anything in the lab.
I showed her the -80°C (-112°F) freezer which she did like as summer is starting in Davis.
I also showed her my favorite part of Briggs, the back exit by the police station.
The back exit is where all the old equipment is put that no one wants anymore. These are the pieces that are too big to just throw in the trash.
There’s old computers, old centrifuges, old heating blocks, old incubators. Tons of cool science equipment.
It’s this sort of industrial wasteland and NO ONE EVER GOES THERE.
My lab is super peaceful, but if something ever got too stressful and I needed to go outside, this is where I’d go.
Why does industrial junk calm me down? I had an air filter going in my room constantly when I was a kid. That constant hum while I slept made me associate industrial hums and old appliances with peaceful rest.
So now places like this always calm me down.
Course, the graduated student didn’t get any of that business. Shook her hand and congratulated her on graduating after I showed her the junk pile before going back inside to my lab.
I know! Field trips in a Master’s of Science program? How ridiculous!
It was awesome. We went to the Institute of Regenerative Cures in Sacramento.
I arrived early and waited out front with some classmates. Our tour guide arrived and we waited out front a little longer til everyone showed up.
While waiting the tour guide, who had designed the building we were about to go into, told us about his hobby, early television history!
After the primer on early television we entered the building and got a tour of one of the best facilities for practicing biology in existence right now.
The building itself was actually built a long time ago for the California state fair. It was the “women’s building.”
The brick exterior and columnaic entrance have stayed the same since the building was constructed to maintain the historical site. The interior has been heavily modified.
The building had no roof back in the day and was just an enclosure for a bunch of different events that you usually see at state fairs.
The building was sold to the University of California system. They slapped a roof on it, and used it to store records.
Our tour guide said that he was called in to turn it into a biology facility later on. Half the building is used for bio research while the other half is rented out to other companies.
The researchers in the Institute are working on a number of things. They researched a treatment for the “bubble boy disease” there. They’re working on using umbilical cords to create bone marrow for transplants, using Tal proteins to treat Huntington’s, creating HIV resistant cells, and helping people who can’t swallow to swallow are just a few of the things they work on there.
The tour guide also showed us the section that he was most proud of as he had designed it. A set of rooms for making the actual drugs and proteins to export to hospitals. Making the drugs requires extremely sterile technique to prevent giving someone who is already sick something that will make them worse. The rooms are designed to be extremely sterile.
To enter the rooms you pass through an airlock where you are required to cover every inch of your body in a disposable gown.
The airlock goes to a hallway with access to three separate clean rooms.
There is “negative pressure” in the rooms. That means that air is constantly entering the room from the top and going out the bottom. This is so that if any cells that are worked with in the rooms get into the air, they will be redirected to teh ground and sucked out through a grate in the wall instead of ending up in someone’s medicine.
The air is cleaned excessively to about 3000 times more clean than average air before entering the facility.
There is a lot of electrical equipment in the rooms that will require replacing eventually. To prevent electricians from having to gown up just to replace a lightbulb, all the eletricals are accessible from panels on the second story of the building.
It was pretty cool for a scientist like me to see the best possible place to do research in. The tour guide mentioned that he does tours of the interior of the super clean rooms for smaller groups. I might take him up on that at a later time!
I have begun my Master’s project in earnest and the goal is slightly different than what I’d been doing before.
First, I’ll repeat myself. I’m a biologist and I work with introns in C. elegans. C. elegans is a type of nematode worm that naturally lives in soil or on rotting vegetables. It is also one of the most widely used model organisms for biological research.
Introns are unused sections of genes. You’re probably aware that DNA is in our cells and contains the instructions for how an organism functions. The human genome contains around 25,000 genes and those genes are split into two parts, introns and exons.
Exons are the part of that gene that are actually used to produce things in your cells, while introns are spliced out and removed. So why are introns on there at all if they’re removed?
Well it turns out that some introns increase expression of the genes they’re in. My project looks at how placement of those enhancing introns affects expression.
Experiments in plants have shown that an enhancing intron works best when it is placed near the start of a gene. Experiments in C. elegans have suggested that, but no experiment has outright proved it. My project will hopefully do that.
I’m measuring the expression of genes according to how introns affect them, so I get to pick which gene to use. When picking a gene like this scientists often pick what are called reporter genes. The expression of these types of genes is easy to measure, often because they have produce light or fluorescence of some kind. The light tells you whether the gene is on, but also at what level it is turned on based on how bright the cell is.
Previously I was using a reporter gene called GUS. GUS is an enzyme that digests a specially prepared sugar, releasing a blue chemical that was attached to that sugar. The blue chemical is then visible to the naked eye.
There were a number of problems with that experiment though. First, adding the sugar chemical to the worms was a pain, taking about three days to set up and look at. Plus, the blue color was difficult to measure precisely because most of the machines in the lab are set up to measure red or green colors, not blue. Finally, GUS is traditionally a reporter gene for plants, not C. elegans. This could’ve been introducing other problems that we couldn’t easily identify. Thus the use of the GUS reporter gene has been scrapped in favor of another reporter gene.
I’ll be using Green Fluorescent Protein (GFP) as my reporter gene now. GFP is widely used in C. elegans and many other organisms. The protein created by the GFP gene glows green when you shine a red light on it. Very easy to see and measure. None of that three day procedure for GUS. I just pop the worms under the light and take a look.
Why weren’t we using this procedure before if it’s so easy? Two reasons!
Reason number one: C. elegans won’t express GFP without introns in the gene. So does that mean we proceed and hope one intron is enough or do we add the standard amount of introns to get expression? I’ve decided to see what the GFP looks like with the standard introns scientists put in it for C. elegans and without them. I’ll also be testing with an added intron. The whole thing is a little complicated so here’s a diagram to explain.
There are eight different constructs I’m making. They are a combination of three different features that are present or not. Are there introns in the first GFP? Yes or no? The second GFP? And is the Unc54 intron there? This allows us to control for the positional effect the standard introns in C. elegans GFP.
Reason number two: Those eight constructs above? Those aren’t made yet! All the GUS constructs were made when I started the project. I’ve been working on making the new constructs for a few months. It could take a few more months to finish.
So my project is to make those constructs, put them into worms, and then see what the worms look like. As I perform these steps I’ll make more posts about what work I’m doing in lab and why its so cool.
For the past few months I have been assisting in teaching a introductory biology lab at Sac State.
I TA Bio 15L which is a general education course for non-science majors. The course uses interactive labs to go over all the basics of biology, like ecology, speciation, DNA, genes, and that good stuff.
The class has been a lot of fun for me for a lot of different reasons.
I like helping out the students. Its nice to see some of them so interested in biology even if it is nowhere near what their major is. One of them is even considering switching her major.
It’s nice to go over all the material again. I learned it all years ago and everything is easy for me now. Obviously I should know the material in a class that I teach, but its still fun to know that I could get any of the questions in the class right if the teacher called on me, even when I am the teacher.
The experience of being on the other side of a class is also interesting. I have to deal with making quizzes, grading, student absences, and preventing cheating.
Student absences is probably the hardest part. This is a college level class, so they’re free to not show up if they don’t want to. Its just inevitable that the ones who don’t show up do poorly on the quizzes that cover the material they missed or they miss the quizzes entirely. And this is college so there are no makeup quizzes.
There’s nothing I can really do about absences, but I’d like to be able to tech the students that do come to class so that they can all understand the material and use it in their own lives later on.
Learning biology is important for a number of reasons. How can you be an informed voter on GMO issues if you don’t properly understand what GMOs are? How can you vote on global warming initiatives without knowing more about that? And wouldn’t you like to know how genetics work when you start planning a family to see what genetic risks your potential child could have?
I try to teach the students that sort of stuff. I feel like I’m just learning how the labs work this semester. I know I’ll do way better next semester when I can focus more on directing what we are trying to learn with the labs and giving the students more specific strategies for learning.
Also, I can hopefully be more enthusiastic when I give lectures. The mid-semester student evaluations indicated that the only place I really needed to improve was in how enthusiastic my voice sounded when I was presenting the material.
Woo! Yesterday I had my first day of graduate school and it was amazing!
For awhile I’d been worried that I wouldn’t like going back to school once the semester started. All of those worries went away once I stepped out of my car onto campus.
I unfortunately arrived late to my first class. I live in Davis and driving to Sacramento has never taken this long in the past.
I thought I’d budgeted enough for rush hour traffic. I guessed the time accurately except for the time to leave the freeway.
Everyone and their mother wanted to get off the freeway at the Howe Ave exit right by Sacramento State.
Next time I go in the morning I’ll get off at an earlier exit and dodge all that traffic. Hopefully that will get me to school with time to spare.
Anyways! I got approved to be a TA in a lab course which meets Tuesday mornings. This semester I’m in training, but in the future I’ll be paid.
The lab class is a GE fulfilling course, so its filled with students who are not biology majors.
The course is also taught by my graduate adviser, which is a huge plus. We’ll get to know more about each through teaching together which will help a lot later in the graduate school process.
I assisted the students with a simple discussion lab which tried to define what life is.
After the discussion each student took a sterile swabbed and rubbed it on something before rubbing it on a petri dish. Whatever they rubbed onto it will grow over the week and we can take a look at it next Tuesday.
When the lab finished I walked around campus. I found the bookstore, the activities fair (no I don’t want to join a fraternity), the student union, and the library. I at my lunch on the quad and then went to read in the library til my next class.
I have two other classes on Tuesday. The first was about how to be a better TA. I met the other students and the teacher told us a little bit about herself, her teaching style, and some resources we could use to improve ourselves as teachers.
My last class, Molecular Biology, was in the same room as the class on how to be a TA. I was surprised when the teacher walked in because I recognized him!
The teacher for my Molecular Biology class is also the post-doc who works in the same worm lab as me at Davis!
It was a pretty cool coincidence. Apparently he had already known for awhile, but hadn’t told me yet.
I was unfortunately the only person who consistently raised my hand to answer questions in his class. I’m hoping that will change in the future. Maybe everyone else was just shy because they hadn’t met the instructor yet.
At the end of the day the instructor and I discussed carpooling together.
Turns out that won’t work because he lives in Sacramento and I live in Davis. At the end of the day we want to be in different places.
Altogether it was a great day. I loved being back on campus as a student and as a teacher. I love learning and helping other people learn. I’m looking forward to the next two or three years at Sac State!