Enn Original News

Coal Tar Sealant Health Hazards
February 14, 2012 01:04 PM - Andy Soos, ENN

Coal tar is a brown or black liquid of extremely high viscosity, which smells of naphthalene and aromatic hydrocarbons. Coal tar is incorporated into some parking-lot sealcoat products, which are marketed as a means of protecting and beautifying underlying pavement. Sealcoat products that are coal-tar based typically contain 20 to 35 percent coal-tar pitch. Coal-tar-based sealants are emitting polycyclic aromatic hydrocarbons (PAHs) into the air at rates that may be greater than annual emissions from vehicles in the United States, according to new reports by the U.S. Geological Survey, published in the scientific journals Chemosphere and Atmospheric Environment. Children living near coal-tar-sealed pavement are exposed to twice as many PAHs from ingestion of contaminated house dust than from food, according to a separate new study by Baylor University and the USGS, published in the journal Environmental Pollution. Several PAHs are probable human carcinogens and many are toxic to fish and other aquatic life.

Ice Caps and Glaciers Contend for Biggest Loser Award
February 14, 2012 10:27 AM - David A Gabel, ENN

There are few things on Earth that have undergone a more dramatic weight loss than the world's ice caps and glaciers. According to a recent study, they have lost about 150 billion tons per year from 2003 to 2010. Such a large quantity of ice has translated to a 0.4 millimeter rise in sea levels each year. At this rate, it will take 2,500 years for sea levels to rise one meter. However, indications point towards accelerated ice loss in the future. Plus, if including ice lost from the major land-based ice sheets, sea level rise is much worse.

Magma Phase Changes within Planets
February 13, 2012 07:58 PM - Andy Soos, ENN

There is a weirdness deep inside planets. There are intense pressures and temperatures during their formation. Just as graphite can transform into Just as graphite can transform into diamond under high pressure, liquid magmas may similarly undergo major transformations at the pressures and temperatures that exist deep inside Earth-like planets. Using high-powered lasers, scientists at Lawrence Livermore National Laboratory and collaborators discovered that molten magnesium silicate undergoes a phase change in the liquid state, abruptly transforming to a more dense liquid with increasing pressure. The research provides insight into planet formation.

Tetrachloroethylene Toxicity EPA Risk Assessment
February 13, 2012 11:04 AM - Editor, ENN

Tetrachloroethylene, also known under its systematic name tetrachloroethene and many other names, is a chlorocarbon. It is a colorless liquid widely used for dry cleaning of fabrics and is sometimes called "dry-cleaning fluid". It has a sweet odor detectable by most people at a concentration of 1 part per million (1 ppm). It is also used in the cleaning of metal machinery and to manufacture some consumer products and other chemicals. Confirming longstanding scientific understanding and research, the final EPA risk assessment characterizes this material as a likely human carcinogen. The assessment provides estimates for both cancer and non-cancer effects associated with exposure to it over a lifetime.

The Pygmy Nile Crocodile
February 13, 2012 09:47 AM - David A Gabel, ENN

A new study from researchers at the Wildlife Conservation Society (WCS) has uncovered secrets of the mysterious pygmy Nile crocodile. Once thought to be a unique population of the more well-known Nile crocodile, the pygmy Niles are in fact a very distinct crocodile species of West Africa. A couple years ago, their existence was confirmed within the nation of Uganda. The recent WCS study found that their habitat extends into more areas, shedding insight upon this beautiful rare creature.

Price of Solar Energy Decreasing in India
February 13, 2012 08:40 AM - Scott Sincoff, ENN

Solar energy may have a reputation to be more expensive in most parts of the world, but not in India. In the world’s second most populous nation, electricity stemming from solar energy is now cheaper than oil-based energy. The Indian government also has an objective to inaugurate 20,000 megawatts of solar panels by 2022. India’s solar success may have positive implications for other developing countries to show a new and inexpensive alternative energy source for use in not only for basic heating, but to also use for new and innovative technology.

The Decline of Wild Salmon
February 10, 2012 08:12 AM - Andy Soos, ENN

The Chinook salmon, Oncorhynchus tshawytscha, is the largest species in the pacific (Oncorhynchus) salmon family. Other commonly used names for the species include King salmon, Quinnat salmon, Spring salmon and Tyee salmon. Chinook are an anadromous fish native to the north Pacific Ocean and the river systems of western North America ranging from California to Alaska. Scientists have found that only about ten percent of the fall-run Chinook salmon spawning in California's Mokelumne River are naturally produced wild salmon. A massive influx of hatchery-raised fish that return to spawn in the wild is masking the fact that too few wild fish are returning to sustain a natural population in the river. The study, published in the online journal PLoS ONE, highlights the danger of relying on ordinary census techniques to evaluate the health of wild salmon populations and their habitats. Most hatchery fish in California are unmarked and therefore undetectable in population surveys. For this study, the researchers were able to identify hatchery fish by using a novel technique to detect traces of a hatchery diet preserved in the ear bones of adult fish.

Marguerite Bay Glaciation
February 9, 2012 02:24 PM - Editor, ENN

Marguerite Bay or Margaret Bay is an extensive bay on the west side of the Antarctic Peninsula, which is bounded on the north by Adelaide Island and on the south by Wordie Ice Shelf, George VI Sound and Alexander Island. A new paper reports glacial geological data that provide evidence for the timing of ice-sheet retreat and thinning at the end of the last glaciation (~10,000 years ago) in Marguerite Bay. The length of time that rock outcrops have been exposed was dated which allow dating of the thinning of the ice sheet, and the record from seabed sediments. This then allows the determination of how the ice sheet retreated across the continental shelf. The dating shows a surprising pattern. About 9,600 years ago, the ice in Marguerite Bay appears to have thinned very quickly indeed, an observation that turns out to be consistent with several other datasets from the same area (ice-shelf collapse histories, raised beaches and lake sediment cores).

Sturgeon Thunder
February 9, 2012 11:24 AM - AndySoos, ENN

A giant among Wisconsin's inland freshwater fishes, the bottom dwelling lake sturgeon is a living fossil - a relic from the Middle Ages of fish evolution. This ancient species made its first appearance about 100 million years ago in the Upper Cretaceous period of the Mesozoic era, just about the time that the dinosaurs made their abrupt exit from Earth's ever-changing stage. Today the lake sturgeon retains many primitive characteristics that have been lost or modified in other modern-day fishes. Research into the mysterious sounds that lake sturgeon produce resumes in April, or whenever the water warms to a temperature conducive for fish spawning, which is the best time to experience sturgeon thunder. In spring, Ron Bruch, a biologist with the Wisconsin Department of Natural Resources, and Chris Bocast, an acoustic ecologist with the UW Sea Grant Institute, will conduct additional biological examinations and collect detailed field recordings of the infrasonic sounds of this ancient fish.

Zebra Stripes as Bug Repellant
February 9, 2012 09:46 AM - David A Gabel, ENN

On the plains of Africa, the zebra are not the only creature roaming in herds. There are a great number of other species, not least of all, the dreaded horsefly. Zebras, like all horse species, have large bodies which they cannot always reach with their mouths, hooves, or tails, making them an inviting prey for blood-sucking, flying insects. More than the lion, the horsefly is the bane of zebra's existence. This, according to a recent study published in the Journal of Experimental Biology, is why zebras evolved to having stripes. The black and white stripes effectively deter the horseflies by making the zebras less attractive.

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