Glue made from genetically modified bacteria can knit cracks in concrete
2010 11 25
By Niall Firth | DailyMail.co.uk
A bacteria that can knit together cracks in concrete structures by producing a special ‘glue’ has been developed by British scientists.
The genetically-modified microbe has been programmed to swim down fine cracks in the concrete. Once at the bottom it produces a mixture of calcium carbonate and a bacterial glue which combine to ‘knit’ the building back together.
The ‘BacillaFilla’ eventually hardens to become the same strength as the surrounding concrete and is designed to make buildings last longer.
Filler: The bacteria could be injected into a crack in a concrete wall and would self-germinate until it had filled the gap.
Joint project instructor Dr Jennifer Hallinan said: ‘Around five per cent of all man-made carbon dioxide emissions are from the production of concrete, making it a significant contributor to global warming.
‘Finding a way of prolonging the lifespan of existing structures means we could reduce this environmental impact and work towards a more sustainable solution.
’This could be particularly useful in earthquake zones where hundreds of buildings have to be flattened because there is currently no easy way of repairing the cracks and making them structurally sound.”
The bacterium used by researchers is called Bacillus subtilis and is commonly found in soil.
The BacillaFilla spores only start germinating when they make contact with concrete – triggered by the very specific pH of the material – and they have an in-built self-destruct gene which means they would be unable to survive in the environment.
Once the cells have germinated, they swarm down the fine cracks in the concrete and are able to sense when they reach the bottom because of the clumping of the bacteria.
This clumping activates concrete repair, with the cells differentiating into three types: cells which produce calcium carbonate crystals, cells which act as reinforcing fibres and cells which produce a glue which acts as a binding agent and fills the gap.
The microbial glue was designed by students at Newcastle University as part of a major international science competition in the US.
Article from: dailymail.co.uk
Bacteria Can Stand-Up and "Walk"
Bacteria and Phytoplankton Affect the Weather
Alexander the Great Killed by Toxic Bacteria?
Computer-Controlled Bacteria Build a Miniature Pyramid
An Input/Output Device for the Brain - Made of Light, Algae, and Bacteria
Much of Britain was Exposed to Bacteria Sprayed in Secret Trials (The Guardian, 2002)
Too Much Technology Kills Good Bacteria
Latest News from our Front Page
Hungary’s Orban Bashes Liberal Immigration Policy
2014 08 29
Hungary’s Prime Minister Viktor Orban on Monday lashed out against immigration, setting one of the main policy objectives of his next term in power after winning parliamentary elections in April.
“The goal is to cease immigration whatsoever,” said Hungary’s prime minister. “I think the current liberal immigration policy, which is considered obvious and morally based, is hypocrite,” Mr. Orban said.
At a ...
China’s “Duplitecture” Cities Mimic the World’s Greatest Architectural Hits
2014 08 29
The best knockoffs in the world are in China. There are plenty of fake designer handbags and Rolexes, but China’s knockoffs go way beyond fashion. There are knockoff Apple stores that look so much like the real thing that some employees believe they are working in real Apple stores. And then there are entire knockoff cities. There are Venices with ...
Kiev loses control of Novoazovsk, rebel troops advance in southeast Ukraine
2014 08 29
Kiev’s troops had to leave the eastern Ukrainian city of Novoazovsk to save their lives, said the country’s Security and Defense Council. The authorities admitted that self-defense forces are advancing and leading a counteroffensive in the southeast.
Along with Novoazovsk, Kiev troops have lost control over the villages of Amvrosiivka and Starobeshevo in the Donetsk Region of Eastern Ukraine.
According to Ukraine’s ...
Mohammed is most popular name in Oslo
2014 08 29
For the first time in the capital city’s history, Mohammed is the most common name for boys and men, said a study on Thursday.
Statistics Norway (Statistisk Sentralbyrå - SSB) has counted the population of Oslo and found that Mohammed is the most common male name in Oslo for the first time ever.
Jørgen Ouren of SSB said to NRK: “It is ...
Beaten to Death at McDonald’s
2014 08 29
To the four clean-cut college freshman out on a double date, it had seemed like a typical McDonald’s: spanking clean, well-lighted, and safe. It was in a good neighborhood too, right next to Texas A&M University in College Station -- a campus known for its friendly atmosphere and official down-home greeting: “howdy.”
Shortly after 2 A.M. that Sunday, they pulled into ...
|More News » |