"The New York Department of Environmental Protection installed a prototype "algal turf scrubber" at once of its wastewater treatment plants in Queens. The scrubber--two 350-foot metal ramps coated with algae that grows naturally--is designed to use algae to remove nutrients and boost dissolved oxygen in the water that passes through it. John McLaughlin, Director of Ecological Services for the New York City Department of Environmental Protection (DEP), and Peter May, restoration ecologist for Biohabitats, explain how the scrubber works, and where the harvested algae goes."
Courtesy C-MOREDr. Dan Repeta from the Woods Hole Oceanographic Institution (WHOI) is C-MORE’s Chief Scientist on the BiG RAPA expedition, which is conducting research off the coast of Chile. Dr. Repeta and his team of scientists are sampling the underwater microbial environment using a variety of instruments, including a water collector called a CTD (see educational resource below). Two interesting results have turned up in the CTD data:
Courtesy Eric Grabowski, C-MORE"Sea It Live" in some BiG RAPA videos. Join Dr. Angel White from Oregon State University as she demonstrates the CTD rosette. Then join Dr. Repeta for his Chief Scientist Station 1 Update .
*Educational resource = C-MORE Science Kit Ocean Conveyor Belt's Powerpoint, "Lesson 3: Using Data to Explore Ocean Processes "
The current issue of the journal Science is reporting that a rock formation recently found in Australia is turning back the origination date of oxygen on Earth.
The new data shows that oxygen was on the planet about 50 to 100 million years before previously thought. It’s not a huge time difference when you consider the previous early indications of oxygen date back 2.3 billion to 2.4 billion years ago.
That’s the time range that researchers like to call the "Great Oxidation Event," and believe me, you wouldn’t have wanted to be around then. Earth’s air was composed primarily of methane and ammonia at that time. The origins of the "Great Oxidation Event" aren’t understood yet, but that was the start of the process that has led to 21percent of our atmosphere being made up of oxygen. And of course, without oxygen living beings like us wouldn’t be able to breath.
The rock core found in Australia is a 3,000-foot-long chunk found in western Australia. The new discovery fuels further speculation that there are strong links between changes in the Earth’s geology and its biology, researchers say. That’s the big question that researchers have to delve into next.
Now, new research is questioning that conventional wisdom, and is even wondering if the process of CPR (cardiopulmonary resuscitation) could actually be leading to a quicker death. Hold on to your hat and read on.
The old thinking was that cells of the body would begin to die within four or five minutes of the stoppage of oxygen and nutrients coming to them through blood. The quicker a heart can be restarted and breathing can begin, the better the chances were for a body to go on living.
Researchers at the University of Pennsylvania have been studying heart cells under microscopes. What they’ve found throws all that stuff up into the air. What they found was that cells cut off from their lifeline of blood died hours later, not minutes.
Now here’s the real freaky part. The researchers think that the cells die faster when their oxygen supply is quickly returned.
So the quick surge of oxygen and energy into the body may be just the wrong thing do to someone whose breathing and blood flow have stopped. These researchers are thinking that hypothermia – extreme cold temperatures bringing the body’s core temperature to 33 degrees C – might be a better option. Then medical professionals would have time to adjust the blood chemistry for a safe, gradual return of oxygen and nutrients to the cells, keeping them alive.
University of California researchers have tried a slightly different approach of treatment at four hospitals. Cardiac patients received a blood infusion that would keep their hearts in a state of suspended animation. They were on a heart-lung device to maintain blood flow to the brain until the heart could be slowly restarted. The tests were conducted in just 34 patients, but 80 percent were discharged from a hospital okay. Under the old methods, the survival rate is 15 percent.
A lot more research has to be done, but the findings do shake up what we’ve traditionally thought about how to keep people living. Share your thoughts on this topic with other Science Buzz readers here.
Michael Waltrip's NASCAR team was heavily fined this week for cheating. Inspectors found an unspecified substance in the engine which was thought to unfairly boost his car's performance. But what was this mysterious stuff? Most sources say inspectors found oxygenate in the engine's intake manifold. So if that's the case how does this stuff work?
The air that gets sucked into the engine just comes from the outside world. The same air we breath. The explosion works because our air has about 21% oxygen in it and oxygen really likes to burn. But what if we could add more oxygen to this equation? This results in a more complete combustion of the fuel and more power. More power means more speed.
From what I've read on the web it seems that Waltrip's team was using a type of gel that sits in the air intake on the engine. As the gel evaporated it would release oxygen into the engine which would then be used for combustion, increasing power. NASCAR was none to happy about this and fined the crew chief of the team, David Hyder, $100,000 and kicked him out of the garage.
Incidentally you might be using another type of oxygenate in your car right now, ethanol. Ethanol is mixed in with gasoline to reduce emissions because it is an oxygenate. When you get a more complete combustion with added oxygen you also get less exhaust and less harmful emissions. I still think that Ethanol is a poor alternative fuel strategy but that's another story for another time.
Scientists at Rutgers University in New Jersey have discovered that the amount of oxygen in the Earth's atmosphere has more than doubled over the last 205 million years.
By studying samples of seafloor material going back millions of years, they determined that the atmosphere was only 10% oxygen during the time of the dinosaurs. It rose as high as 23% by 40 million years ago. (The air is 21% oxygen today.) That's about the time that really large mammals, like elephants and rhinos, started to emerge.
Oxygen levels may have affected the evolution of mammals. These warm-blooded creatures need three to six times as much oxygen as a reptile of the same size. The lack of oxygen may have prevented them from growing very large. But as oxygen levels increased, mammals could start getting bigger.