CU News
News from the University of Colorado in Boulder.
Alleged serial bike thief gets caught
Jun 11th
A serial thief who has stolen bikes from University of Colorado students on at least three occasions has been arrested. The Boulder County Sheriff’s Office arrested Wayne Willet Cron last week on an outstanding warrant requested by the University of Colorado Police Department. On June 6, 2013, the District Attorney’s Office charged Cron with three felonies – Theft between $1,000 to $20,000 (Class 4 felony), Theft By Receiving (Class 4 felony) and Providing False Information to a Pawnbroker (Class 6 felony).
Cron, a 40-year-old transient, was also arrested in 2005 and 2010 for stealing bikes from CU students. In the most recent case, a CU student reported that someone had cut a cable lock on Jan. 17, 2013, near the Ekeley Sciences Building to steal his brand-new $3,000 Cannondale mountain bike.
On March 23, 2013, the victim contacted UCPD to say he found his bike listed for sale on the eBay website. A YouTube video on that site briefly showed part of the bike’s serial number, which matched the victim’s stolen bike. UCPD detectives contacted the listed seller, a Denver pawnshop, and learned that Cron sold the Cannondale bike to the pawnshop on Jan. 17, 2013 – the same day of the reported theft. On that day, Cron signed documents stating he had owned the bike for one year and acknowledged that providing false information was a felony.
UCPD recovered the bike and returned it to the rightful owner. UCPD requested that a judge approve an arrest warrant for Cron. The suspect has an extensive criminal history in five states, including arrests for burglary, larceny and pawn violations.
“The keys to solving this case started with the victim knowing his bike’s serial number and ended with solid detective work,” said CU-Boulder police spokesman Ryan Huff. “It’s critical that CU students register their bikes so they can be more easily located if stolen. This case also shows that cable locks are easily defeated. U-locks are a better option for securing your bike.”
The CU Police Department asks students, faculty and staff to register their bicycle’s serial number at the CU Bike Station, just east of the University Memorial Center. If their bikes are ever stolen, police have a better chance of finding them by accessing a nationwide database. For other safety tips, please visit the UCPD website’s bike theft prevention page athttp://bit.ly/CUBikeSafety.
CU police press release
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CU study hints conditions on Mars may support energy for life forms
May 30th
The findings, published in the journal Nature Geoscience, also hint at the possibility that hydrogen-dependent life could have existed where iron-rich igneous rocks on Mars were once in contact with water.
Scientists have thoroughly investigated how rock-water reactions can produce hydrogen in places where the temperatures are far too hot for living things to survive, such as in the rocks that underlie hydrothermal vent systems on the floor of the Atlantic Ocean. The hydrogen gases produced in those rocks do eventually feed microbial life, but the communities are located only in small, cooler oases where the vent fluids mix with seawater.
The new study, led by CU-Boulder Research Associate Lisa Mayhew, set out to investigate whether hydrogen-producing reactions also could take place in the much more abundant rocks that are infiltrated with water at temperatures cool enough for life to survive.
“Water-rock reactions that produce hydrogen gas are thought to have been one of the earliest sources of energy for life on Earth,” said Mayhew, who worked on the study as a doctoral student in CU-Boulder Associate Professor Alexis Templeton’s lab in the Department of Geological Sciences.
“However, we know very little about the possibility that hydrogen will be produced from these reactions when the temperatures are low enough that life can survive. If these reactions could make enough hydrogen at these low temperatures, then microorganisms might be able to live in the rocks where this reaction occurs, which could potentially be a huge subsurface microbial habitat for hydrogen-utilizing life.”
When igneous rocks, which form when magma slowly cools deep within the Earth, are infiltrated by ocean water, some of the minerals release unstable atoms of iron into the water. At high temperatures — warmer than 392 degrees Fahrenheit — scientists know that the unstable atoms, known as reduced iron, can rapidly split water molecules and produce hydrogen gas, as well as new minerals containing iron in the more stable, oxidized form.
Mayhew and her co-authors, including Templeton, submerged rocks in water in the absence of oxygen to determine if a similar reaction would take place at much lower temperatures, between 122 and 212 degrees Fahrenheit. The researchers found that the rocks did create hydrogen — potentially enough hydrogen to support life.
To understand in more detail the chemical reactions that produced the hydrogen in the lab experiments, the researchers used “synchrotron radiation” — which is created by electrons orbiting in a manmade storage ring — to determine the type and location of iron in the rocks on a microscale.
The researchers expected to find that the reduced iron in minerals like olivine had converted to the more stable oxidized state, just as occurs at higher temperatures. But when they conducted their analyses at the Stanford Synchrotron Radiation Lightsource at Stanford University, they were surprised to find newly formed oxidized iron on “spinel” minerals found in the rocks. Spinels are minerals with a cubic structure that are highly conductive.
Finding oxidized iron on the spinels led the team to hypothesize that, at low temperatures, the conductive spinels were helping facilitate the exchange of electrons between reduced iron and water, a process that is necessary for the iron to split the water molecules and create the hydrogen gas.
“After observing the formation of oxidized iron on spinels, we realized there was a strong correlation between the amount of hydrogen produced and the volume percent of spinel phases in the reaction materials,” Mayhew said. “Generally, the more spinels, the more hydrogen.”
Not only is there a potentially large volume of rock on Earth that may undergo these low temperature reactions, but the same types of rocks also are prevalent on Mars, Mayhew said. Minerals that form as a result of the water-rock reactions on Earth have been detected on Mars as well, which means that the process described in the new study may have implications for potential Martian microbial habitats.
Mayhew and Templeton are already building on this study with their co-authors, including Thomas McCollom at CU-Boulder’s Laboratory for Atmospheric and Space Physics, to see if the hydrogen-producing reactions can actually sustain microbes in the lab.
This study was funded by the David and Lucille Packard Foundation and with a U.S. Department of Energy Early Career grant to Templeton.
-CU-
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