FEB 14, 2016 11:09 AM PST

Better to See You With - Bacteria are Tiny Eyes

WRITTEN BY: Kerry Evans
Cyanobacteria have the unique ability to move towards light, a process called phototaxis.

According to microbiologists Ian Stewart and Ian R. Falconer, “cyanobacteria are arguably the most successful group of microorganisms on earth. They are the most genetically diverse; they occupy a broad range of habitats across all latitudes, widespread in freshwater, marine, and terrestrial ecosystems, and they are found in the most extreme niches such as hot springs, salt works, and hypersaline bays. Photoautotrophic, oxygen-producing cyanobacteria created the conditions in the planet's early atmosphere that directed the evolution of aerobic metabolism and eukaryotic photosynthesis. Cyanobacteria fulfill vital ecological functions in the world's oceans, being important contributors to global carbon and nitrogen budgets.”

Being photosynthetic, these bacteria need a way to sense and respond to light.  Researchers from the University of Freiburg found that cells of cyanobacteria, also known as blue-green algae, function like teeny, tiny eyeballs.  
 
Cyanobacteria act like tiny eyes.

According to University of Freiburg microbiologist Conrad Mullineaux, “the fact that bacteria respond to light is one of the oldest scientific observations of their behaviour … our observation that bacteria are optical objects is pretty obvious with hindsight, but we never thought of it until we saw it.  And no one else noticed it before either, despite the fact that scientists have been looking at bacteria under microscopes for the last 340 years.”

Mullineaux and colleagues discovered that each spherical bacterium functions like a lens.  When light hits one side of the cell, the light is refracted and focused to the opposite side of the cell.  Light receptors tell the cell to move away from the focused light, using their pili to move toward the light source.
 

Sources: eLIFE, Popular Science, Wikipedia
About the Author
  • Kerry received a doctorate in microbiology from the University of Arkansas for Medical Sciences.
You May Also Like
JUL 19, 2018
Cardiology
JUL 19, 2018
HIV Infection Doubles Risk of Heart Disease
Recent study of 150 countries and over 800,000 people shows HIV patients are more than twice as likely to develop Heart Disease than uninfected individuals....
JUL 24, 2018
Microbiology
JUL 24, 2018
Salmonella Outbreak Linked to Raw Turkey Products
Researchers at the CDC are trying to learn more about a rash of Salmonella infections....
JUL 28, 2018
Videos
JUL 28, 2018
Separating Microbial Fact From Fiction
Can the toilet really send germs flying to your toothbrush?...
AUG 12, 2018
Microbiology
AUG 12, 2018
What Allows Some Microbes to Live in the Gut?
Microbes have to first pass through the harsh stomach environment to colonize the gastrointestinal tract....
AUG 29, 2018
Health & Medicine
AUG 29, 2018
Wearing Contacts While Sleeping Can Lead to Severe Eye Infections
Contact lenses can be a boon to patients who need eyesight correction. Fumbling with glasses, changing to sunglasses when outside, and trying to exercise o...
OCT 08, 2018
Microbiology
OCT 08, 2018
Is a Virus Causing a Mysterious Polio-like Illness in Kids?
Sometime in 2014, the CDC began to get reports of a mysterious illness that was affecting children. More cases have appeared since then....
Loading Comments...