New GM technique injects mosquitoes with a gene that results in mostly male offspring, eventually leading to a population crash.
Previous efforts to tackle the disease, that kills more than 1 million people each year – most of whom are African children – have included bed nets to protect people and insecticides to kill the mosquito species most responsible for the transmission of malaria (Anopheles gambiae
). The new technique by a team at Imperial College London involves injecting mosquitoes with a gene that causes the vast majority of their offspring to be male, leading to an eventual dramatic decline in population within six generations as females disappear. “You have a short-term benefit because males don’t bite humans [and transmit malaria],” Andrea Crisanti, one of the authors of the new research, which was published in the journal Nature Communications on Tuesday
, told the Guardian. “But in the long term you will eventually eradicate or substantially reduce mosquitoes. This could make a substantial contribution to eradicating malaria, combined with other tools such as insecticides.”
These new mosquitoes are now set to be used in Brazil, having been approved for use by the Brazilian government with a factory for their production now opened. [more inside]
In March 2012, inspectors from the U.S. Department of Agriculture uncovered a problem in Elgin, Texas. Beef sausage from a small family-run meat processor appeared to have been contaminated with a nasty bacterium called Listeria monocytogenes. The bug can make people sick and, in rare cases, be deadly. The processor had to recall more than a ton of sausage. It’s the kind of story that strikes terror in the hearts of other sausage peddlers, including Mike Satzow, so he uses phages to keep his small company's sausages safe to eat.
One of the many problems farmers of various kinds of legumes need to deal with is the pea aphid
. They reproduce incredibly fast and live by sucking the sap out of the plants, an electron micrograph of one in action
. However, while they are terrifying parasites of legumes, they have their own yet more horrific parasites, a parasitoid
wasp. Here is a really nice close up picture of one doing its thing
, a video of the act
, and here is a brain meltingly horrific video of a dissection of the mummified aftermath 8 days later
. Essentially, these wasps deposit their eggs in a pea aphid and the growing larva feeds on it, developing there for about a week, and then consuming the host from the inside out
like a Xenomorph
. When it’s done, the wasp larva dries the aphid’s cuticle into a papery brittle shell and an adult wasp emerges from the aphid mummy. Legume farmers love them, and you can even order their mummies online these days
. However, farmers noticed that the wasps didn't work as effectively on all of the aphids, and so researchers went to work figuring out why. It turns out that all aphids have a primary bacterial endosymbiont living inside their cells, in addition to and just like a mitochondria, and that many have some combination of five other secondary endosymbionts
. Interestingly, two of those other five, Hamiltonella defensa
and Serratia symbiotica
have been shown to confer varying levels of resistance to the parasitoid wasp, allowing the aphid to survive infection. However, it turns out that there is yet one more layer to this story, [more inside]
The International Science & Engineering Visualization Challenge 2010
- "Researchers are generating mind-boggling volumes of data at exponentially increasing rates. The ability to process that information and display it in ways that enhance understanding is an increasingly important aspect of the way scientists communicate with each other and—especially—with students and the general public. That's why, for the past 8 years, Science and the U.S. National Science Foundation (NSF) have co-sponsored annual challenges to promote cutting-edge efforts to visualize scientific data, principles, and ideas. This year's awardees
span scales from nanoparticles to colliding galaxies, and from microseconds to millennia."
There has been a new discipline developing in molecular biology for some time now, Bioanimation! Projects have ranged in size from WEHI
's colossal compilation
to Harvard Biovision
's magnum opus "Inner Life of the Cell"
to commercially produced masterpieces
to smaller projects by university PIs and enthusiasts. much [more inside]
Bacteriophages ("phages" for short) were the only effective treatment against infectious diseases until antibiotics came along during WWII.
Phages are the most ubiquitous organism on Earth. They are naturally occurring viruses that infect bacteria and bacteria only. We live in a sea of phages. Our bodies are more phage than human. There approximately 10 to the 32 power of them around us. That's 10 with 32 zeros behind it.
Antibiotics cannot keep up with evolving infections, while phages naturally co-evolve with the bacteria.
Currently we are in a growing antibiotic crisis
and phage therapy is getting a serious look again.
Here's a fascinating discussion
from National Public Radio.
The Big Picture Book of Viruses
is "intended to serve as both a catalog of virus pictures on the Internet and as an educational resource to those seeking more information about viruses. To this end, it is intimately linked to All the Virology on the WWW
, and our collection of Virology Courses and Tutorials." Interesting electron micrographs include
pictures of Marburg and Ebola viruses
and T-4 like phages
. Once a bio geek, always a bio geek. And for some other information about why viruses always matter see The 1918 Influenza Pandemic
(sorry the page design sucks but it's a good read) and The American Experience: Influenza 1918
. Are you sure that runny nose is just allergies?