Posts tagged science
Posts tagged science
Understanding the Limits of Lionfish Invasion
Lauren’s research has since been peer reviewed three times. The results of the expanded study by Dr. Craig Layman, Chancellor’s Faculty Excellence Fellow at North Carolina State University, and Zachary Jud, a graduate student at Florida International University, was published this year in the journal Environmental Biology of Fishes. Lauren’s research was cited and credited with the initial discovery.
She called her experiment Understanding the Limits of Lionfish Invasion. The hypothesis was that lionfish needed a certain amount of salinity in their environment. Scientists measure water salinity by the amount of salt found in 1000 grams of water. So if there is one gram of salt in 1000 grams of water, the amount of salinity would be expressed as 1 part per thousand, or 1ppt.
The salinity of the area where Lauren found the lionfish is part of the Jupiter inlet that connects to the Atlantic Ocean and averaged the same ocean salinity of 35 parts per thousand.
For two weeks, Lauren observed the lionfish’s food intake and stress levels as she reduced the salinity of the water. She believed that because of their natural ocean habitat, it would be unable to survive with a salinity of less than 13 parts per thousand. However, when that level was reached, there was no change in their behavior. She continued to lower the levels until she reached a salinity of 6 ppt. The lionfish survived.
Lauren had discovered that lionfish can survive in freshwater.
Not bad for a 12-year-old whose research project earned her third place in a sixth grade science fair.
Cosima: Do you wanna do some science?
Kira: Science class?
Cosima: Yeah, it’s my favorite. Pure science. You wanna do it?
Cosima: We’re gonna do an experiment.
Viral Membrane Protects Medical Nanorobots From Immune System
Scientists say they have developed a cloaking device to spirit medical nanorobots of the future past immune systems into diseased cells. Their innovation comes from stealing a powerful weapon viruses wield to infect their hosts.
Some viruses wrap themselves in a protective membrane to avoid detection by their host’s immune system and enter cells they are trying to infect. A team at Harvard’s Wyss Institute for Biologically Inspired Engineering have been able to construct their own version of a viral membrane.
Plateau’s laws modeling soap bubbles
A transit is the astronomical event that occurs when one celestial body appears to move across the face of another celestial body, hiding a small part of it, as seen by an observer at some particular vantage point. If the first celestial body hides a major part, or all of, the second celestial body, then it is an occultation rather than a transit.
Progress: Science Moves Humanity in the Right Direction
Darwin did not write the book of horseshit, a goat fucking misogynist did way back when folks made human sacrifice to the seasons for a bountiful harvest.
Sigh… Mormons, What a Tragedy
This is what religion does to children. Total fantasy presented - seriously - as a science project.
Religion is child abuse.
Data…???….really? Where’d you get you get that data? Pulled it out of your ass.
I just want to highlight this illuminating infographic by James Powell in which, based on more than 2000 peer-reviewed publications, he counts the number of authors from November, 2012 to December, 2013 who explicitly deny global warming (that is, who propose a fundamentally different reason for temperature rise than anthropogenic CO2). The number is exactly one. In addition Powell also has helpful links to the abstracts and main text bodies of the relevant papers.
It’s worth noting how many authors agree with the basic fact of global warming – more than nine thousand. And that’s just in a single year. Now I understand as well as anyone else that consensus does not imply truth but I find it odd how there aren’t even a handful of scientists who deny global warming presumably because the global warming mafia threatens to throttle them if they do. It’s not like we are seeing a 70-30% split, or even a 90-10% split. No, the split is more like 99.99-0.01%.
The controversial discovery of 68-million-year-old soft tissue from the bones of a Tyrannosaurus rex finally has a physical explanation. According to new research, iron in the dinosaur’s body preserved the tissue before it could decay.
The find was also controversial, because scientists had thought proteins that make up soft tissue should degrade in less than 1 million years in the best of conditions. In most cases, microbes feast on a dead animal’s soft tissue, destroying it within weeks. The tissue must be something else, perhaps the product of a later bacterial invasion, critics argued.
Then, in 2007, Schweitzer and her colleagues analyzed the chemistry of the T. rex proteins. They found the proteins really did come from dinosaur soft tissue. The tissue was collagen, they reported in the journal Science, and it shared similarities with bird collagen — which makes sense, as modern birds evolved from theropod dinosaurs such as T. rex.
Dinosaurs’ iron-rich blood, combined with a good environment for fossilization, may explain the amazing existence of soft tissue from the Cretaceous (a period that lasted from about 65.5 million to 145.5 million years ago) and even earlier. The specimens Schweitzer works with, including skin, show evidence of excellent preservation. The bones of these various specimens are articulated, not scattered, suggesting they were buried quickly. They’re also buried in sandstone, which is porous and may wick away bacteria and reactive enzymes that would otherwise degrade the bone.
Amazing NEW Periodic Table Song & Video!
If the Animaniacs and Science had a child, this would be it! Every element of the Periodic Table, sung, in order!
Science…Not Tea Party Origins
Brainless Slime Molds Shed Light On The Evolution of Memory
“We have shown for the first time that a single-celled organism with no brain uses an external spatial memory to navigate through a complex environment,” said Christopher Reid from the University’s School of Biological Sciences.
…“Results from insect studies, for example ants leaving pheromone trails, have already challenged the assumption that navigation requires learning or a sophisticated spatial awareness. We’ve now gone one better and shown that even an organism without a nervous system can navigate a complex environment, with the help of externalized memory.”
The research method was inspired by robots designed to respond only to feedback from their immediate environment to navigate obstacles and avoid becoming trapped. This “reactive navigation” method allows robots to navigate without a programmed map or the ability to build one and slime molds use the same process.
When it is foraging, the slime mold avoids areas that it has already “slimed,” suggesting it can sense extracellular slime upon contact and will recognize and avoid areas it has already explored.
…“We then upped the ante for the slime molds by challenging them with the U-shaped trap problem to test their navigational ability in a more complex situation than foraging. We found that, as we had predicted, its success was greatly dependent on being able to apply its external spatial memory to navigate its way out of the trap.”