Category Archives: Biological
In a deviation from standard posts, I turn to the current outbreak of the Ebola virus in West Africa. The infographic from Forbes below may shed some light on the relative extent and virulence of this outbreak.
EBOLA VIRUS DISEASE: VIRULENCE PER OUTBREAK. Rectangles are outbreaks, labelled with year. Size is number of disease cases. Color is virulence, the case fatality rate from 0% yellow to red 100%. (Data: WHO / CC BY: JV Chamary / Source)
This short story has nothing to do with Ebola, but if you want to see how a very common pathogen can be use for germ-warfare, then read Cohesion Lost.
The bionic eye is an artificial device that gives site to the blind or enhanced sight to those who can see on their own — a cybernetic device. Currently, bionic eyes for the blind are experimental with some success depending on when the patient was blinded and what cause the blindness. According to Wikipedia, there are at least 11 ongoing bionic eye projects:
- Argus Retinal Prosthesis
- Microsystem-based Visual Prosthesis (MIVIP)
- Implantable Miniature Telescope
- Tübingen MPDA Project Alpha IMS
- Harvard/MIT Retinal Implant
- Artificial Silicon Retina (ASR)
- Optoelectronic Retinal Prosthesis
- Dobelle Eye
- Intracortical Visual Prosthesis
- Virtual Retinal Display (VRD)
- Visual Cortical Implant
In the video below Miikka Tertho, a blind man, sees images for first time (filmed by the University of Tuebingen/Retina Implant AG). This is not Six Million Dollar Man stuff. (Remember that show?) This is not Lee Majors zooming in on the bad guy with a “boop-boop-boop-boop.” This is a blind who can see because he has something like parts of a camcorder stuck in his eye.
Seeing verses Perceiving
Mike May (not the guy in the video above) was 3 years old when a chemical explosion blinded him. In 2000 when he was 46 years old, he regained partial vision after a corneal transplantation stem cell procedure. Although he can see, he has difficulty perceiving. “May still has no intuitive grasp of depth perception. As people walk away from him, he perceives them as literally shrinking in size, problems distinguishing male from female faces, and recognizing emotional expressions on unfamiliar faces”(Wikipedia, Article: Mike May (skier))
One theory is that the temporal visual cortex uses prior memory and experiences to make sense of shapes, colors and forms. During our first five years of life outside the womb, our brains are building a library or database of images associated with their context. Over time, subtle cues are extracted from those images. The visual cortex compares the image we see now to those library of cues. But that part of the library of our brain is best stocked early when our brains are subtle. For Mike May, this part of the library was closed, but he was able to stock the cues in the sound and touch section. He developed very precise senses of hearing and touch.
The Problem with Adult Bionics
In the future when cybernetic replacements or enhancements are more common, it will also be necessary to fiddle with the mind to get the implants to work easily. A method might be found that will allow the patient to restock his or her visual database quickly. If not, then seeing will not equal perceiving.
Images and video courtesy of Retina Implant AG.
Earlier this week, The Associated Press reported that a paralyzed man remotely controlled a simple robot using only thoughts. (The images shown here are not from that experiment, but from one done three years ago by Honda. More on that later.)
The robot was a small, simple device that moved on wheels, was equipped with a camera, and had a laptop computer perched on top. The paralyzed man, Mark-Andre Duc, was 62 miles (100 km) away and controlled it using only a head cap while trying to raise his paralyzed fingers. The electroencephalogram (EEG) cap measured his brain signals, which were interpreted as command movements.
Both the researchers and the Mr. Duc admit it is not easy to use. Jose Millan, the team’s leader said, “Sooner or later your attention will drop and this will degrade the signal.” Mr. Duc told The Associated Press through the video link on the laptop, “When I’m in pain it becomes more difficult.”
Using measureable thoughts to control an electronic device isn’t totally unique.
- Spring 2006: Honda Research Institute in Japan used feedback from an MRI (Magnetic Resonance Imaging) machine to remotely control a robotic hand. (Shown in video below.)
- Spring 2009: A team lead by Javier Minguez at the University of Zaragoza in Spain worked on robotic thought manipulated wheelchairs.
- Spring 2009: Honda Research Institute in Japan demonstrated how their robot Asimo could lift an arm or a leg through signals from a user with EEG and NIRS (near-infrared spectroscopy sensors). (Shown in video below.)
- Fall 2009: Toy maker Mattel released a game based on a simplified version of this concept with mixed reviews.
- Fall 2010: A team lead by Rajesh Rao from Neural Systems Laboratory, University of Washington, not only working on mind control of a robot, but also to how to teach the robot simple tasks using the same mechanism (The Robot That Reads Your Mind to Train Itself).
- Spring 2011: A team lead by C.T. Lin from California State University at Northridge creates EEG cap driven wheelchair that adapts to the operator’s unique brain patterns. For obstacle avoidance, the wheelchair is also equipped with a laser sensor and cameras. (See their video.)
Intricate manipulation such as tying shoelaces is not possible yet with EEG caps since the signal is inherently too noisy. To get cleaner signals, we have to tap directly into the brain. Ouch. That painful subject is for another blog.
All that glitters is not gold. Sometimes it is cancer.
How about gold-plated cancer?
We can do that now, or more technically: gold nanoparticles infused with an antibody called cetuximab attach to growth factors (EGFR) expressed on the surface of some cancer cells. In other words, bind just the right antibodies to gold nanoparticles, inject them into tissue, and cancer cells will be covered with gold.
Ok, you get gold to stick to cancer cells like socks stick to a sweater pulled from a dryer. What a waste of money, right?
Well, no. First, although they’re not cheep, don’t go rushing to the gold exchange with jar filled with nano-gold-slush. You won’t get much for it there. The gold nanoparticles are spheres of gold less than 100 nanometers (nm) in diameter. To put the size in perspective, 100 nm is about 500 times smaller than the diameter of human hair.
Second, according to a paper released by the National Center for Biotechnology Information, you can zap the gold-targeted cancer cells with shortwave radiofrequency (RF) energy. “Exposure of cells to a noninvasive RF field produced nearly 100% cytotoxicity in cells treated with the cetuximab-conjugated gold nanoparticles, but significantly lower levels of cytotoxicity in the two control groups (P < 0.00012).” In other words, the cancer cells died, and the normal cells lived.
Shortwave RF penetrates deeply into the body with no adverse side effects, as long as you’re not entirely made of gold. Like putting a fork in the microwave oven, it kills the cancer cells by heating them up. Now in this study, it only worked with two types of cancer cells: ones for pancreatic and colorectal cancer (Panc-1 or Difi cells), but similar methods may be available for different cancers. In another study (How could gold save my life?), it was shown that the same method might also be used to detect breast cancer.
Thanks guys. Great work!
Video courtesy Kathryn Dean via YouTube.
See the soon-to-be-published science fiction novel Recruiting Angles for bio-nanotechnolgy in action.
How do you get a nano-robot to target and kill just cancer cells but leave healthy cells alone?
Think like a suicide bomber:
- Carry a concealed mass killing weapon like a bomb,
- Act and look like you belong,
- Get into the enemy’s site, and
- Blow it up.
Nanotechnology for medicine does not necessarily mean robotic machinery. On the nanometer scale, the mechanism is more like a virus and can better be characterized by bio-chemistry. A nano-scaled robot uses molecular keys (cell targeting ligands) and special polymers (diblock copolymers) instead of gears and cogs.
This video explains it best:
So what are the healing stones? They are theoretical first-aid nano-bot factories and delivery systems. See other “Healing Stone” articles for more information.
Of all the future technological breakthroughs noted on this site, I hope this one comes first.
See Recruiting Angles for nano-medicine in action.
Image and video from Frank Gu Research Group, Department of Chemical Engineering, University of Waterloo, Ontario, Canada.
I just got back from the doctor for a cybernetic implant tune-up. She got on my case for going beyond the six month recommended tune-up cycle. I also haven’t been taking the prescribed minerals the nano-factories need to spit out the little doctors.
What? You haven’t heard about little doctors? (Yes, this is fictional.) How about nanites? No? What century are you living in, the 21st? OK, I’ll explain. Here in the 23rd Century, little doctors or bio-nano-robots are microscopic biomechanical engines — some as small as a large molecule — injected into your bloodstream either by needle, by healing stones, or more commonly by cybernetic implants. The implants create the little doctors on an as-needed basis.
I’ll expand on this more in future posts, but in summary, they extend your natural healing systems, reinforce bone and muscular structures, and help fight against aging. Here’s an old but good vid about the early uses of nanotechnology and bio-nano-robots:
Oh, by the way. If you do get the implants, be sure to keep your virus protection up to date. The implants makes potential computer viruses more deadly than some biological viruses.
See Recruiting Angles for healing stones in action.
See Death Has No Shadow for for nanites gone wild.
Image from Metallurgy for Dummies.