Body

The first comparative study on the evolution of sperm quality in young Spanish men over ten years, headed by researchers at the University of Murcia, reveals that spermatozoid concentration in men between 18 and 23 years in the regions of Murcia and Almeria has dropped by an annual average of 2%.

The suspicion that the semen of Spanish men is losing quality now takes force in the case of young men from Murcia and Almeria.

January 17, 2013--Nyon, Switzerland

Sarcopenia, or the gradual loss of muscle mass, is a common consequence of ageing, and poses a significant risk factor for disability in older adults. As muscle strength plays an important role in the tendency to fall, sarcopenia leads to an increased risk of fractures and other injuries.

Membrane proteins are the "molecular machines" in biological cell envelopes. They control diverse processes, such as the transport of molecules across the lipid membrane, signal transduction, and photosynthesis. Their shape, i.e. folding of the molecules, plays a decisive role in the formation of, e.g., pores in the cell membrane. In the Cell magazine, researchers of Karlsruhe Institute of Technology and the University of Cagliari are now reporting a novel charge zipper principle used by proteins to form functional units (DOI: 10.1016/j.cell.2012.12.017).

This may look like yet another video of a dividing cell, but there's a catch. You are looking at chromosomes (red) being pulled apart by the mitotic spindle (green), but it's not a cell, because there's no cell membrane. Like a child sucking an egg out of its shell, Ivo Telley from the European Molecular Biology Laboratory (EMBL) in Heidelberg, Germany, removed these cellular 'innards' from a fruit fly embryo, at a stage when it is essentially a sac full of membrane-less 'cells' that divide and divide without building physical barriers to separate themselves from each other.

Cyanobacteria belong to the Earth's oldest organisms. They are still present today in oceans and waters and even in hot springs. By producing oxygen and evolving into multicellular forms, they played a key role in the emergence of organisms that breathe oxygen. This has, now, been demonstrated by a team of scientists under the supervision and instruction of evolutionary biologists from the University of Zurich. According to their studies, cyanobacteria developed multicellularity around one billion years earlier than eukaryotes – cells with one true nucleus.

Philadelphia – Psychiatrists who are exposed to conflict-of-interest (COI) policies during their residency are less likely to prescribe brand-name antidepressants after graduation than those who trained in residency programs without such policies, according to a new study by researchers from the Perelman School of Medicine at the University of Pennsylvania.

Athens, Ga. – Light emitting diodes, more commonly called LEDs, are known for their energy efficiency and durability, but the bluish, cold light of current white LEDs has precluded their widespread use for indoor lighting.

Scientists from the University of Manchester have discovered that weight loss seen during an intestinal worm infection is actually beneficial in fighting off the parasite.

The findings published on January 17 in PLOS Pathogens are from a collaboration between Professor Richard Grencis of the Manchester Immunology Group and Professor John McLaughlin from the School of Translational Medicine. The research shows the immune system hijacks our natural feeding pathways causing weight loss, which drives our defense mechanisms down the correct pathway to expel the worms.

Using data collected about Labrador Retrievers, research published in BioMed Central's open access journal BMC Veterinary Research is beginning to quantify the health, illnesses, and veterinary care of dogs.

The UK is a nation of pet lovers – but what do we know about the health of our pets? To date the long term (longitudinal) study of canine diseases has been patchy, relying on information from referral centers and details about pet illnesses which are not reported to a vet have never been studied before.

Scientists from The University of Manchester have discovered that weight loss plays an important role in the body's response to fighting off intestinal worms.

The findings have been published in the journal PLOS Pathogens and show that the immune system hijacks the natural feeding pathways causing weight loss. This then drives the defense mechanisms down the correct pathway to expel the worms.

Whether an applicant receives a high or low score may have more to do with who else was interviewed that day than the overall strength of the applicant pool, according to new research published in Psychological Science, a journal of the Association for Psychological Science.

ROCHESTER, Minn. -- One of the most common types of brain tumors in adults, glioblastoma multiforme, is one of the most devastating. Even with recent advances in surgery, radiation and chemotherapy, the aggressive and invasive tumors become resistant to treatment, and median survival of patients is only about 15 months. In a study published in Neuro-Oncology, researchers at Mayo Clinic identify an important association between the naturally occurring enzyme Kallikrein 6, also known as KLK6, and the malignant tumors.

WASHINGTON— The rapid decline in costs associated with many common laboratory techniques, such as DNA sequencing and synthesis, has led to their adoption by individuals outside of traditional university or industrial settings, giving rise to a rapidly growing Do-It-Yourself Biology (DIYbio) community.

AMHERST, Mass. – Dogs and wolves are genetically so similar, it's been difficult for biologists to understand why wolves remain fiercely wild, while dogs can gladly become "man's best friend." Now, doctoral research by evolutionary biologist Kathryn Lord at the University of Massachusetts Amherst suggests the different behaviors are related to the animals' earliest sensory experiences and the critical period of socialization. Details appear in the current issue of Ethology.

CHESTNUT HILL, MA (Jan. 17, 2013) – A new study that looked at more than 75,000 children in day care in Norway found little evidence that the amount of time a child spends in child care leads to an increase in behavioral problems, according to researchers from the United States and Norway.

Several prior studies in the U.S. made connections between the time a child spends in day care and behavioral problems, but the results from Norway contradict those earlier findings, the researchers report in the online version of the journal Child Development.