Body

Studying female reproductive tracts and sperm in diving beetles (Dytiscidae), researchers from the University of Arizona and Syracuse University have obtained a glimpse into a bizarre and amazing world of sperm that can take on a variety of forms – including joining together into conglomerates that navigate the twisted mazes of the female reproductive tract.

Analyses of the evolutionary relationships among diving beetles reveal that sperm form appears to follow function dictated by female reproductive organs.

Boston, MA — Using whole-genome sequencing, a team led by researchers from Harvard School of Public Health (HSPH) and the Broad Institute has traced the path of the E. coli outbreak that sickened thousands and killed over 50 people in Germany in summer 2011 and also caused a smaller outbreak in France. It is one of the first uses of genome sequencing to study the dynamics of a food-borne outbreak and provides further evidence that genomic tools can be used to investigate future outbreaks and provide greater insight into the emergence and spread of infectious diseases.

Experts from the Department of Orthopaedic Surgery at NYU Langone Medical Center will present their latest research and clinical findings on diseases of the muscle, tendon, bone and joint at the annual meeting of the American Academy of Orthopaedic Surgeons (AAOS), February 7-11 in San Francisco, California.

MADISON – When William Murphy works with some of the most powerful tools in biology, he thinks about making tools that can fit together. These constructions sound a bit like socket wrenches, which can be assembled to turn a half-inch nut in tight quarters, or to loosen a rusted-tight one-inch bolt using a very persuasive lever.

As researchers work to eliminate malaria worldwide, new strategies are needed to find and treat individuals who have malaria, but show no signs of the disease. The prevalence of asymptomatic or minimally symptomatic malaria can be as high as 35 percent in populations with malaria and these asymptomatic individuals can serve as a reservoir for spreading malaria even in areas where disease transmission has declined.

Reston, Va. -- In two new studies featured in the February issue of the Journal of Nuclear Medicine, researchers are revealing how molecular imaging can be used to solve mysteries about difficult cases of breast cancer. One article focuses on an imaging agent that targets estrogen receptors in estrogen receptor–positive breast cancer patients with formerly inconclusive assessments, and the second highlights a different imaging agent's ability to help predict the prognosis for patients undergoing chemotherapy for a very aggressive type of breast cancer.

Chicago -- Injectable progesterone contraceptives may be associated with poor periodontal health, according to research in the Journal of Periodontology. The study found that women who are currently taking depotmedroxyprogesterone acetate (DMPA) injectable contraceptive, or have taken DMPA in the past, are more likely to have indicators of poor periodontal health, including gingivitis and periodontitis, than women who have never taken the injectable contraceptive. DMPA is a long-lasting progestin-only injectable contraceptive administered intermuscularly every three months.

Grand Rapids, Mich. – A recent discovery by Van Andel Research Institute (VARI) scientists enables the prediction of patient sensitivity to proposed drug therapies for glioblastoma – the most common and most aggressive malignant brain tumor in humans.

The study, published in January in the Proceedings of the National Academy of Science, investigated glioblastoma models characterized by cell signaling activation and gene amplification for their susceptibility to inhibitors of both the human MET oncogene and the epidermal growth factor receptor (EFGR).

Research just published by a team of demographers at the social science research organization NORC at the University of Chicago contradicts a long-held belief that the mortality rate of Americans flattens out above age 80.

It also explains why there are only half as many people in the U.S. age 100 and above than the Census Bureau predicted there would be as recently as six years ago.

GAINESVILLE, Fla. – Satellite tracking of threatened loggerhead sea turtles has revealed two previously unknown feeding 'hotspots' in the Gulf of Mexico that are providing important habitat for at least three separate populations of the turtles, according to a study published recently in the journal Biological Conservation.

The two sites, located in the open waters off the coast of Southwest Florida and the northern tip of the Yucatan Peninsula, were found by a team of scientists when they compiled and analyzed loggerhead tracking data.

The stereotypical Christmas gift shopper is a stressed-to-the-max individual with a filled-to-the-rim shopping cart in a busy shopping mall. The shopping hysteria during the weeks before Christmas is frequently debated in the media, and the seeming overflow of just about everything is often viewed as immoral.

(Santa Barbara, Calif.) –– Infectious disease has joined poaching and habitat loss as a major threat to the survival of African great apes as they have become restricted to ever-smaller populations. Despite the work of dedicated conservationists, efforts to save our closest living relatives from ecological extinction are largely failing, and new scientific approaches are necessary to analyze major threats and find innovative solutions.

COLUMBIA, Mo. – As the interest in environmentally responsible business practices grows globally, researchers are interested in how that interest translates into consumer sales. Researchers from the University of Missouri have found that United States consumers are more willing to buy clothing made from sustainably grown U.S. cotton than apparel produced using conventional practices in an unknown location. Jung Ha-Brookshire, an assistant professor in the textile and apparel management department in the College of Human Environmental Sciences at MU, says transparency is the key.

ORLANDO, Fla., February 6, 2012 – It's well known that exercising reduces body weight because it draws on fat stores that muscle can burn as fuel. But a new study at Sanford-Burnham Medical Research Institute (Sanford-Burnham) suggests that the heart also plays a role in breaking down fat. In their study, published February 6 in the Journal of Clinical Investigation, Sheila Collins, Ph.D. and colleagues detail how hormones released by the heart stimulate fat cell metabolism.

A University of Minnesota-led research team has proposed a mechanism for the control of whether embryonic stem cells continue to proliferate and stay stem cells, or differentiate into adult cells like brain, liver or skin.

The work has implications in two areas. In cancer treatment, it is desirable to inhibit cell proliferation. But to grow adult stem cells for transplantation to victims of injury or disease, it would be desirable to sustain proliferation until a sufficient number of cells have been produced to make a usable organ or tissue.