I finally finished the hydroponic garden I’ve been building at Hive76 for the past few months. The plants have just started to sprout, so it will be at least another month before they can be harvested. But when they are ready, if you want to take some cuttings for yourself at open house you’re more than welcome to. Right now I am growing basil, thyme, oregano and morning glories.
Unfortunately, I’m spending the rest of the summer in Germany so I won’t be at open house to answer any questions in person, but I will be back in september. In the mean time I’ll start posting the blueprints of the hydrogarden, so anyone will be able to build one if they want. Hope to have more of the details next week!
Thanks, to Pete for agreeing to watch my plants while I’m gone, Rob for letting me steal his wood and carpentry techniques to build the frame, and Jordan for helping to design the caster flat bed and general support!
Super-wide screen made from a single large sheet of bacterial cellulose “paper”
PJ and a number of other Hive members have been fortunate enough to participate in preparations for the Drexel Design Futures Lab “Projects 12/13” exhibition. PJ was almost certainly the most involved Hive contributor — he helped with the development of a number of key software elements for several of the exhibits.
Side view of a BC culture, showing the cellulose pellicle (white “gel” on surface), growth medium and some bacteria/yeast colonies (dark brown structures). The bubbles are CO2 produced by the yeast.
I wound up getting involved in the creation of a special display screen that was part of an interactive piece which allows people to “play” with a computer model of bacterial swarms. This piece was part of Tashia Tucker’s exhibit, and she wanted an “organic looking” display surface. After some brainstorming that included condemnations of the high price of silicone etc., PJ suggested bacterial cellulose. What!? The idea of a movie screen made by real bacteria to show movies of simulated bacteria was too “meta” to pass up.
I had grown some fairly large sheets of bacterial cellulose in the past, and was interested in having an excuse to grow something even larger — so sign me up! Tashia wanted a sheet that started out about 4′x8′ so that the final screen could be cropped to dimensions that were about the size of a slightly gigantic person.
Yikes — this was literally a tall order. Bacterial Cellulose (BC) is created by the same organisms that are used to ferment Kombucha — in fact, the “Shroom” or “Scoby” in a Kombucha culture is a big lump of cellulose. So this was simple, in principle, but the scale of the piece left a lot of novel details that had to be worked out.
The Creator’s Project released a new video, and our sugar printing, gelation, and blood pumping was featured in it! Trackback is to 3Ders.org The project goal is to unify artists and technologists and this video is focused on 3D Printing:
And I just got done with a talk at ScienceOnTap Philly! It was a truly excellent night! Special thanks to the Organizers and also the Hivers who came out or emailed in their support! You peeps are the best.
Here are some pics via the Twittersphere. Thanks to the photographers for posting!
New hydroponic setup… Let’s just say my carpentry skills are a little rusty.
So here is a quick update on my hydroponics setup at Hive76. In my previous post I uploaded a video on a hydroponic garden I built in my basement two years ago. My goal was to build the setup with as little moving parts as possible to ensure the garden required little maintenance. With the hydroponic garden I am building at Hive76 I decided to keep to the spirit of simplicity but a completely different approach with it.
With my latest versionI am using medical grade IV bags to store the water above the plants. Then by attaching a mechanism to the IV bags known as a ‘flow controller’, gravity pulls the water from the bags to the plants below at a consistent rate. The rate at which water flows through that controller be anywhere from 5 to 250 ml / hr.
The IV bags and flow controllers are great because they are very inexpensive (one IV bag and flow controller cost me a few dollars from medtecmedical.com). Plus they can potentially be reused since they are being used on plants and not humans if you are careful to prevent contamination. But possible the most useful thing about using IV bags is that they require no energy to operate, which further reduces costs.
IV bags filled with water.
To evenly distribute the water that is supplied by the IV bags to the plants, I put the plants within a medium of rockwool cubes that are about 1 cubic centimeter in size. The rockwool essentially acts as a sponge that takes the water that is supplied by the IV drip and evenly distributes it to all the plants within the container.
I’m testing my current hydroponic setup on spinach seeds at the moment. The plants are still in their infancy so I have not added nutrients to their water supply yet but I plan to do so in about a week(adding too high a concentration of nutrients to young plants can damage their roots). My short term goal is to monitor the spinach in my hydroponic setup through its entire life cycle, taking general notes along the way. After the plants have finished their life cycle I want to take some time to build a second prototype and post its plans on Hive’s webpage. Hopefully by that point, the system will be a useful platform for scientific experimentation. Then the real fun can begin!!!
Gravity flow controller: controls the flow rate of liquid from the IV bags.
Germinating seed in rockwool and temperature probe.
My current project at Hive76 is working on indoor hydroponic systems. The project comes from an interest in plants that I picked up from tending to my mother’s garden as a child. My family was fortunate to have enough land for a sizable garden when I was growing up, but now that I live near center city Philadelphia, good plots of land can be difficult to find. So I naturally turned to hydroponics because it is not limited by land area the same way that traditional farming is.
Hydroponics has the potential to revolutionize farming as we know it because it allows for plants to be grown in highly controlled environments. This means that the light, water, and nutrients that plants need to thrive can be optimized to promote rapid growth while reducing waste and pollution. Also, as mentioned before, hydroponics systems be built vertically instead of just horizontally, which is a huge benefit in dense urban environments like Philadelphia.
Even with all the potential benefits of hydroponics, it has yet to become a competitor with traditional farming in the open market. There are many reasons for this, one reason is that the cost of lighting in an indoor hydroponic system will always cost more than traditional farming, which gets its light for free from the sun. (Luckily the cost of lighting is dropping all the time with advancements in florescent bulbs and LED technology.) Another reason is that there is a lot of politics around farming that doesn’t favor the development of hydroponics.
Despite all the this, hydroponics is still holds a lot of potential to revolutionize agriculture. It is also a great way to learn about plant science. I’m particularly interested in using hydroponics to develop a low cost platform for amateur science experiments. The hope is that by empowering people with the right tools , the next breakthrough in agriculture might come from a high-school student’s science fair project!
The hydroponic system that I am building at Hive76 is very much in the early stages. In the meantime, I wanted to post a video on a previous hydroponic system that I built in my basement 2 years ago. It works by flooding the roots of the plants with water supplied by a reservoir below.
I gave a talk too where I delved deeper into the science behind our work with RepRap for research in Regenerative Medicine and I made the case that open source is a philosophy, not a checkbox. Try not to get caught up in semantics of open vs. not-open (e.g. one could try to label Arduino as not an “open” platform since it has proprietary Atmel chips on the board). Instead, try to think of open projects as those in which you see people as collaborators (“open”), not customers (“closed”). We all have many things we can learn from each other, and who doesn’t want more collaborators to learn science together? Some interesting Q&A at the end too.
One of our core members, Jordan Miller, has just published a scientific paper using RepRap 3D printing technology to engineer living tissues for regenerative medicine. I’ll give you a rundown of the science and a step-by-step guide of how Jordan got to this great spot in his career. Jordan is quick to point out that this is work that would not have been possible 5 years ago, or without the help of RepRap, Hive76, and this wonderful city of Philadelphia.
There are other labs around the world that are attempting what Jordan and the rest of the team at UPenn and MIT have been working towards. The end goal of regenerative medicine research is engineered tissues and replacement organs for treatment of human disease. As Science news says,
Imagine a world where if your heart or kidneys failed, you wouldn’t have to endure an agonizing, possibly futile wait for a donor whose organ your body might reject. Instead, a doctor would simply take cells from your own body and use them to “grow” you a new organ.
Other lines of research are attempting to 3D print directly with living cells and gel. These so-called “bioprinting” approaches involve loading cells and gel in syringes to be used as feedstock to create a structure from scratch. The problem is that healthy liver cells, for example, usually die of starvation (lack of nutrients) and suffocation (lack of oxygen) while enduring the slow 3D printing process.
Jordan’s 3D printed vasculature approach was inspired by whole organ vascular casts like this one.
Enter Jordan and his innovation: since vasculature provides the lifeblood to resident cells, why not focus on the vasculature first?
Jordan and the rest of the research team at UPenn and MIT have developed a new way to create vasculature for living tissues. This 4 step process involves: 1) 3D printing a network of sugar filaments, 2) surrounding it with living cells in a gel, 3) dissolving away the sugar to leave behind a vascular network for 4) the delivery of nutrients and oxygen. He accomplished this with a custom built 3D printer, extruder and control software.
Here’s a step-by-step of Jordan’s many year process:
Get a crazy idea to link sugar and vasculature when comparing the interior of a 3D print to a capillary network.
You can read the Penn press release about this awesome science, an overview from Science News, or the full paper. A more detailed post about the hardware used in this project will follow and soon you’ll be able to make your own sugar extruder. (It prints chocolate too!)
Back in mid September, we made a batch of Bacterial Cellulose in two 44″ x 18″ tray bioreactors, using Adam Korshid’s “blanco cellulose” medium (sugar, yeast and apple-cider vinegar in ratios carefully measured by eye and tongue). About two weeks later, one of the cultures had essentially failed, but the other had blossomed with a vengeance, coughing up a giant, off-while pellicle that was about 3/8 inches thick and probably weighing a good 10 pounds. For what it’s worth, it was also quite a smelly beast. In fact, the smell largely motivated the timing of the harvest (kind of a “get-that-friggin-thing-outta-here” situation). One unexpected benefit of the stench was that I was able to identify butyric acid as the main offender — so the absence tea in the culture seems to result in increased butyric acid production. Possibly a consequence of the low nitrogen content of the “blanco” medium? It might be interesting to research the topic …
At any rate, the 44×18 sheet was ultimately dried and delivered to Ann Saintpeter as promised. We’ll see what she prints on it, if anything. While the sheet was drying, I discovered that you could kill the smell by dusting it with baking soda. It also turns out I was late to that particular party — apparently baking soda is renown as an odor killer precisely because it forms salts with organic acids that tend to be some of the main components of many unpleasant odors.
The sheet ultimately dried to look very much like a giant, soft tortilla, complete with a dusty surface (courtesy of the baking soda). It also ended up with some mild scorch marks, since I was trying to dry it in a hotel room, using the courtesy hair-dryer and iron. If nothing else, the scorch marks helped with the tortilla-like appearance.
I’m currently embarking on a little experiment to study factors influencing cellulose production, including density of the substrate (i.e. how much sugar to hit the production “sweet spot”, so to speak) and substrate type (supposedly glycerin is the ultimate feed-stock). If there are any results worth publishing, we will do so — possibly with hardcopies on microbial cellulose paper.