Guest Post – Page 540 – Shamskm: A site to exchange knowledge and solutions

Study Finds Natural Compound Can Be Used for 3-D Printing of Medical Implants

By Guest PostNovember 3, 2013Science3d printing, 3d printing technology, alexander nguyen, anastasia koroleva, biocompatible, chapel hill, laser zentrum hannover, medical implants, natural compound, non toxic polymers, nontoxic, north Carolina, photoreactive liquid precursors, riboflavin, roger narayan, shaun gittard, solid polymer, state university, three-dimensional, university, vitamin b2

Researchers from North Carolina State University, the University of North Carolina at Chapel Hill and Laser Zentrum Hannover have discovered that a naturally-occurring compound can be incorporated into three-dimensional (3-D) printing processes to create medical implants out of non-toxic polymers. The compound is riboflavin, which is better known as vitamin B2.

“This opens the door to a much wider range of biocompatible implant materials, which can be used to develop customized implant designs using 3-D printing technology,” says Dr. Roger Narayan, senior author of a paper describing the work and a professor in the joint biomedical engineering department at NC State and UNC-Chapel Hill. (more…)

Single mutation gives virus new target

By Guest PostNovember 3, 2013Sciencecell cultures, ganglioside sugar, human polyomavirus, surface of cells

A mutation as minute as swapping just one amino acid can completely change the target that a virus will bind to on a victim cell — potentially shifting what kind of cell and eventually what kind of organism a virus could infect.

PROVIDENCE, R.I. [Brown University] — In a new study published online in the journal PLoS Pathogens, an international team of scientists showed that by swapping a single amino acid they could change the sugar to which the human BK polyomavirus will binds on the surface of cells. The BK polyomavirus lost the ability to bind its usual target sugar and instead “preferred” the same sugar as its cousin SV40 polyomavirus, which is active in monkeys. (more…)

Redwood trees reveal history of West Coast rain, fog, ocean conditions

By Guest PostNovember 3, 2013Environmentatmosphere, climate change, coastal redwoods, coastline, dendrochronology, earth, fog, foggy surrounding, historic fires, human caused, jim johnstone, john roden, molecules, natural variability cycles, northern california, ocean condition, oxygen, reconstructing historic climate, redwood trees, redwoods lifetime, southern oregon university, todd dawson, university of california, university of washington, west coast rain

Many people use tree ring records to see into the past. But redwoods – the iconic trees that are the world’s tallest living things – have so far proven too erratic in their growth patterns to help with reconstructing historic climate.

A University of Washington researcher has developed a way to use the trees as a window into coastal conditions, using oxygen and carbon atoms in the wood to detect fog and rainfall in previous seasons. (more…)

Schutz der Antarktis auf Eis gelegt

By Guest PostNovember 2, 2013Natureantarktis, antarktis experte, bob zuur, ccamlr, eu, frankreich, globale verschmutzung, klimawandel, michael poliza, naturschutz, neuseeland, pinguine in antarktis, pinguinen, russland, usa, vorschlag von australien, wwf

WWF: Fischereiinteressen verhindern Meeresschutzgebiete im Südpolarmeer

Hamburg/Hobart – Die Ausweisung riesiger Meeresschutzgebiete in den eisigen Gewässern der Antarktis ist erneut gescheitert. Die Jahreskonferenz der zuständigen internationalen Kommission zur Erhaltung lebender Meeresressourcen (CCAMLR) im australischen Hobart endete, ohne dass besonders empfindliche und wertvolle Regionen des Südpolarmeers mit seiner Tierwelt dauerhaft unter Naturschutz gestellt wurden. „Es ist eine schwere Enttäuschung. Hier geht es um die letzten weitgehend unberührten Meere des Planeten, der antarktische Ozean ist einzigartig und braucht dauerhaften Schutz. Der Druck durch Fischerei, Schifffahrt und Klimawandel nimmt ständig zu“, kritisiert Bob Zuur, Antarktis-Experte des WWF, die fehlenden Resultate. „Auch der dritte Versuch, hier Meeresschutzgebiete zu errichten, ist an dominierenden Fischereiinteressen gescheitert. Die Unfähigkeit hier Einigung zu erzielen, stellt in Frage, ob die CCAMLR-Kommission ihren vorgeschriebenen Schutzauftrag angemessen ausfüllen kann.“ (more…)

‘Witch Head’ Brews Baby Stars

By Guest PostNovember 2, 2013Sciencebaby stars, clouds of nebula, witch head, witch head nebula

A witch appears to be screaming out into space in this new image from NASA’s Wide-Field Infrared Survey Explorer, or WISE. The infrared portrait shows the Witch Head nebula, named after its resemblance to the profile of a wicked witch. Astronomers say the billowy clouds of the nebula, where baby stars are brewing, are being lit up by massive stars. Dust in the cloud is being hit with starlight, causing it to glow with infrared light, which was picked up by WISE’s detectors. (more…)

Ancient water

By Guest PostNovember 2, 2013Environmentancient water, aquifers, archeological artifacts, archeology, decaying plant matter, delaware canal, delaware river, dgs, geology, groundwater replenishment, middletown, new castle, radiocarbon dating, scott andres, tom mckenna, zack coppa

Delaware Geological Survey carbon-dates groundwater found to be thousands of years old

A drop of rain that falls near Middletown, Del., may take as long as 14,000 years to seep through the earth and trickle underground into a well several miles away, according to new research by the Delaware Geological Survey (DGS).

Scientists used radiocarbon-dating techniques to determine the age of groundwater from sites in southern New Castle and Kent counties. (more…)

Left-handed people more likely to have psychotic disorders such as schizophrenia: Yale Study

By Guest PostNovember 2, 2013Healthbiomarker, bipolar syndrome, christopher chee, deanna dial, depression, hussam jefee, left handed people, mary i schroeder, michael helfenbein, psychosis, psychotic disorders, rebecca hana, schizophrenia, us population

Being left-handed has been linked to many mental disorders, but Yale researcher Jadon Webb and his colleagues have found that among those with mental illnesses, people with psychotic disorders like schizophrenia are much more likely to be left-handed than those with mood disorders like depression or bipolar syndrome.

The new study is published in the October-December 2013 issue of the journal SAGE Open. (more…)

Reindeers’ eyes change colour with Arctic seasons

By Guest PostNovember 1, 2013Naturearctic light, arctic reindeer, arctic seasons, colour change, light of summer, reindeer eyes, sensitivity of retina, tissue in eye

The eyes of Arctic reindeer change colour through the seasons from gold to blue, adapting to extreme changes of light levels in their environment and helping detect predators. (more…)

Author Archives: Guest Post