New research has shown that patients having heart surgery do not benefit if doctors wait until a patient has become substantially anaemic before giving a transfusion.

In the UK, about half of all patients having cardiac surgery are given a red blood cell transfusion after the operation, using up to ten per cent of the nation's blood supply. The proportion of patients having a transfusion is high because blood loss and severe anaemia are common after cardiac surgery and transfusion is the preferred treatment. Blood loss causes anaemia which doctors detect by measuring the red cell count or haemoglobin level - a low level triggers transfusion.

Proteins from salt-loving, halophilic, microbes could be the key to cleaning up leaked radioactive strontium and caesium ions from the Fukushima Dai-ichi Nuclear Power Plant incident in Japan. The publication of the X-ray structure of a beta-lactamase enzyme from one such microbe, the halophile Chromohalobacter sp. 560, reveals it to have highly selective cesium binding sites.

Exposure to hormone-altering chemicals called phthalates - which are found in many plastics, foods and personal care products - early in pregnancy is associated with a disruption in an essential pregnancy hormone and adversely affects the masculinization of male genitals in the baby, according to research led by the University of Pittsburgh Graduate School of Public Health.

Prenatal exposure to low doses of the environmental contaminants polychlorinated biphenyls, or PCBs, change the developing brain in an area involved in metabolism, and some effects are apparent even two generations later, a new study finds. Performed in rats, the research will be presented Friday at the Endocrine Society's 97th annual meeting in San Diego.

Hereditary effects included increased body weight, but only in descendants of females--and not males--exposed to PCBs in the womb, said study co-author Andrea Gore, PhD, professor at the University of Texas at Austin.

"These endocrine-disrupting chemicals affect the developing brain differently in males and females," Gore said.

Methane is a potent greenhouse gas, though fortunately has a far shorter lifespan than the CO2 that is implicated in global warming. However, the prevalence of natural gas, cleaner energy which caused CO2 emissions to drop in America, have brought renewed concerns about its effects.

It is not just found in man-made wells, it is common in lakes and swamps, but natural-gas pipelines are the big concern. Understanding the sources of methane, and how the gas is formed, could give scientists a better understanding of its role in warming the planet.

Sitting for many hours per day is associated with increased coronary artery calcification, a marker of subclinical heart disease that can increase the risk of a heart attack, according to research scheduled for presentation at the American College of Cardiology's 64th Annual Scientific Session in San Diego. Coronary artery disease is the most common type of heart disease and the leading cause of death in the United States.