Yearly Archives: 2007

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New Orleans Termites Dodge Katrina Bullet:

Tales of survival have been trickling out of New Orleans ever since Hurricane Katrina struck in August 2005. But few have focused on what might be considered the city’s most tenacious residents–its subterranean termites. Agricultural Research Service (ARS) entomologists recently confirmed what many termite researchers and city officials were hoping against. Despite the high waters, winds and other havoc unleashed by Katrina over a year ago, the invasive Formosan subterranean termite is persisting in New Orleans.

Wetlands Curb Hog Hormones In Waste Water:

Constructed wetlands may help reduce hormones in wastewater from hog farms, an Agricultural Research Service (ARS)-led team reported recently in Environmental Science and Technology. Recently, hog-farm operators have begun incorporating constructed wetlands into their wastewater treatments to reduce nitrogen and phosphorus in the effluent so that it can be spread onto crop fields without causing environmental harm. But little, if any, research has investigated the system’s potential to diminish hormones that hogs excrete into wastewater.

‘Marathon Mice’ Elucidate Little-known Muscle Type:

Researchers report in the January issue of the journal Cell Metabolism, published by Cell Press, the discovery of a genetic “switch” that drives the formation of a poorly understood type of muscle. Moreover, they found, animals whose muscles were full of the so-called IIX fibers were able to run farther and at higher work loads than normal mice could.

Doctors Neglect Insomnia In Older Patients, Study Finds:

The sleep problems of older people are often not addressed by their primary care physicians, even though treatment of those sleep disorders could improve their physical and mental health and enhance their quality of life. That’s the finding of new research from the Feinberg School of Medicine at Northwestern University. When patients 60 years and older visited their primary care doctors, physicians did not note sleep problems in the patients’ charts. This was significant because independent social workers, who interviewed those same patients after their doctors’ visits, learned that 70 percent of them had at least one sleep complaint and 45 percent said they had “difficulty falling asleep, staying asleep, or being able to sleep.”

Estrogen Curbs Appetite In Same Way As The Hormone Leptin:

Estrogen regulates the brain’s energy metabolism in the same way as the hormone leptin, leading the way to a viable approach to tackling obesity in people resistant to leptin, researchers at Yale School of Medicine report in the December 31 online issue of Nature Medicine. “We found that estrogen suppresses appetite using the same pathways in the brain as the adipose hormone leptin,” said lead author Tamas L. Horvath, chair and professor of Comparative Medicine and professor in the Department of Obstetrics, Gynecology & Reproductive Sciences at Yale School of Medicine.

Mouse Lemur Species Not Determined By Coat Color:

A team of researchers has found that nocturnal lemurs thought to belong to different species because of their strikingly different coat colors are not only genetically alike, but belong to the same species. The team, which includes Laurie R. Godfrey, professor of anthropology at the University of Massachusetts Amherst, and UMass graduate student Emilienne Rasoazanabary, has just published its findings in the open access journal BMC Evolutionary Biology.
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The lemurs they tested had three different coat colors and lived in different types of forest locations in southern Madagascar — classic characteristics of separate nocturnal species. Surprisingly, the researchers found that although the lemurs appeared to be different species because they were visually distinct, they did not differ genetically. According to the sequence of this specific gene, all belong to the same previously identified species, Microcebus griseorufus.
The authors also show that lemurs with each of the three different coat colors could be found in all three geographical locations in similar proportions. They note that lemurs are nocturnal animals and tend to depend on auditory cues, or smell, more than on visual cues to recognize each other. They say that this could explain why a certain amount of variation in coat color does not affect species recognition in the mouse lemurs.

Cool-Water Wash For Eggs Can Help Prevent Microbial Contamination:

Using cooler water to wash shell eggs during a second washing can help cool them quicker. This reduces the potential of foodborne pathogen growth both inside the eggs and on the eggshell surface, according to scientists with the Agricultural Research Service (ARS).

To Catch A Pest, Scientists Fine-Tune Traps:

Airborne volatile compounds that attract plant-feeding insects to alfalfa could help growers control cotton pests with fewer pesticides.
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Another study combined the chemical cues with a green-light-emitting diode (LED), which imitated a visual cue that attracts plant-feeding insects. Alone, the LED drew several females, but when combined with volatile or synthetic cues, it attracted both males and females at all stages of maturity. In some tests, the LED-synthetic compound combination drew positive responses of 80 percent or higher.

Bisexual Fruit Flies Show New Role For Neurochemical:

Fruit flies’ ability to discern one sex from another may depend on the number of receptors on the surface of nerve cells, and the number of receptors is controlled by levels of a ubiquitous brain chemical, University of Illinois at Chicago researchers have found.
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A UIC research team led by David Featherstone, assistant professor of biological sciences, has discovered that receptor numbers are controlled by the brain’s level of glutamate. But it is not the same glutamate that most neuroscientists think about — the neurotransmitter that moves in message packets across the synapse. Instead, it is what Featherstone calls ambient extracellular glutamate, which just floats around the nervous system and has generally been ignored because no one knew where it came from or what it was doing.
For years, scientists failed to identify glutamate as a key neurotransmitter precisely because there was so much of it.
“It made no sense,” said Featherstone. “People figured you couldn’t use glutamate to send messages because there was too much glutamate background noise in the brain. It turns out that this background noise plays an important part in regulating information transfer.”
Featherstone and his lab team found that glia cells are the source of the excess ambient glutamate. Along with neurons, these poorly understood “support” cells fill the brain.

New Species Of Lizard Found In Borneo:

Chris Austin, assistant curator of herpetology at LSU’s Museum of Natural Science, or LSUMNS, and adjunct professor in biological sciences, recently discovered a new species of lizard while conducting field research in Borneo.

Sleep Disturbances, Nightmares Are Common Among Suicide Attempters:

In the first known report of its kind, a study published in the January 1st issue of the journal SLEEP finds that sleep disturbances are common among suicide attempters, and that nightmares are associated with suicidality.

Narcolepsy May Be Caused By Environmental Exposures:

In a possible contradiction to common belief that a person’s body mass index, immune responses and stressful life events are factors that may cause narcolepsy, a comprehensive review published in the January 1st issue of the journal SLEEP finds that, as with other diseases characterized by selective cell loss, narcolepsy may be caused by environmental exposures before the age of onset in genetically susceptible individuals.

High Aflatoxin Levels In Wild Bird Feed:

Wild birdseed contained higher levels of aflatoxins and other mycotoxins than any other kind of pet food analyzed in studies done around the world, a new review of those studies reports in an article scheduled for the Dec. 27 issue of ACS’ Journal of Agricultural and Food Chemistry.

Link Between Insomnia And Hypersomnia, Depression In Children:

According to a study published in the January 1st issue of the journal SLEEP, sleep-disturbed children are more severely depressed and have more depressive symptoms and comorbid anxiety disorders compared with children without sleep disturbance. To ensure the most effective care, parents of sleep-disturbed children are advised to first consult with the child’s pediatrician, who may issue a referral to a sleep specialist for comprehensive testing and treatment.

Zebrafish Study Yield Novel Genes Critical In Organ Development:

Researchers at the University of Minnesota have identified a group of novel genes that are critical in organ development. The scientists studied the roles of genes in the zebrafish secretome. This group of genes makes proteins that are located on the surface or outside of cells in the body, and are responsible for directing “patterning” in the body, or ensuring that cells divide, differentiate and migrate to properly form vital organs in the correct places during development.

Climate Experts Search For Answers In The Oceans:

By absorbing half of the carbon dioxide emitted into the atmosphere, the oceans have a profound influence on climate. However, their ability to take up this carbon dioxide might be impaired as a result of climate change. To determine their response to global warming, ESA has backed two projects that provide systematic data on key oceanic variables – colour and temperature.

What Crawls Beneath: Ground Spider Diversity Linked To Healthy Habitats:

None of Takesha Henderson’s discoveries are named Charlotte, but they are weaving a new chapter in Texas entomology. Her graduate studies at Texas A&M University have led to the discovery of 25 new spiders in Brazos County and one species found for the first time in Texas.

Do Galaxies Follow Darwinian Evolution?:

Using VIMOS on ESO’s Very Large Telescope, a team of French and Italian astronomers have shown the strong influence the environment exerts on the way galaxies form and evolve. The scientists have for the first time charted remote parts of the Universe, showing that the distribution of galaxies has considerably evolved with time, depending on the galaxies’ immediate surroundings. This surprising discovery poses new challenges for theories of the formation and evolution of galaxies.

U.S. Proposes Listing Polar Bears As Threatened Species:

U.S. Secretary of the Interior Dirk Kempthorne has announced the U.S. Fish and Wildlife Service is proposing to list the polar bear as a threatened species under the Endangered Species Act and initiating a comprehensive scientific review to assess the current status and future of the species.