الخميس، 1 أغسطس 2013

ScienceDaily: Top News

ScienceDaily: Top News


Fertility therapy not associated with long-term cardiovascular disease

Posted: 31 Jul 2013 08:01 PM PDT

Women who gave birth following fertility treatment had no long-term increased risk of death or major cardiovascular events compared to women who gave birth without fertility therapy, according to new research.

Understanding the effects of genes on human traits

Posted: 31 Jul 2013 01:47 PM PDT

Recent technological developments in genomics have revealed a large number of genetic influences on common complex diseases, such as diabetes, asthma, cancer or schizophrenia. However, discovering a genetic variant predisposing to a disease is only a first step. Scientists now propose a novel approach for scanning the entire genome that will help us understand the effect of genes on human traits.

Figuring out flow dynamics

Posted: 31 Jul 2013 01:47 PM PDT

Scientists have been building models of turbulent flow. Recently, they developed a new and improved way of looking at the composition of turbulence near walls, the type of flow that dominates our everyday life. Their research could lead to significant fuel savings, as a large amount of energy is consumed by ships and planes, for example, to counteract turbulence-induced drag.

A glass of milk after eating sugary cereals may prevent cavities

Posted: 31 Jul 2013 01:47 PM PDT

Sugary cereals eaten dry could cause tooth decay, but when washed down with milk after eating, plaque acid levels are reduced, reducing damage to tooth enamel that leads to cavities, according to new research.

Anemia linked to increased risk of dementia

Posted: 31 Jul 2013 01:47 PM PDT

Anemia, or low levels of red blood cells, may increase the risk of dementia, according to a new study.

Spitzer Discovers Young Stars with a 'Hula Hoop'

Posted: 31 Jul 2013 12:57 PM PDT

Astronomers using NASA's Spitzer Space Telescope have spotted a young stellar system that "blinks" every 93 days. Called YLW 16A, the system likely consists of three developing stars, two of which are surrounded by a disk of material left over from the star-formation process.

NASA's Cassini sees forces controlling Enceladus jets

Posted: 31 Jul 2013 12:53 PM PDT

The intensity of the jets of water ice and organic particles that shoot out from Saturn's moon Enceladus depends on the moon's proximity to the ringed planet, according to data obtained by NASA's Cassini spacecraft.

One in three U. S. youths report being victims of dating violence

Posted: 31 Jul 2013 12:22 PM PDT

About one in three American youths age 14-20 say they've been of victims of dating violence and almost one in three acknowledge they've committed violence toward a date, according to new study.

Nanomaterials: Sized-up for strength

Posted: 31 Jul 2013 12:20 PM PDT

Experiments and numerical simulations show that miniaturized ultra-small platinum cylinders weaken when their constituents are reduced in number.

New variants at gene linked to kidney disease, sleeping sickness resistance

Posted: 31 Jul 2013 10:39 AM PDT

A new study involves a classic case of evolution's fickle nature: a genetic mutation that protects against a potentially fatal infectious disease also appears to increase the risk of developing a chronic, debilitating condition.

Universal law for light absorption in 2-D semiconductors

Posted: 31 Jul 2013 10:32 AM PDT

Researchers have demonstrated a universal law of light absorption for 2-D semiconductors. This discovery not only provides new insight into the optical properties of 2-D semiconductors and quantum wells, it should also open doors to exotic new optoelectronic and photonic technologies.

Game changer for synthesizing new materials: Method synthesizes thousands of new compounds with ultra low thermal conductivity

Posted: 31 Jul 2013 10:32 AM PDT

A chemist likens his lab's newly published accomplishments to combining two flavors of ice cream and churning out thousands of flavors to appeal to any taste bud. In reality, he is referring to his method of synthesizing thousands of new compounds with ultra low thermal conductivity.

'Highway from Hell' fueled Costa Rican volcano

Posted: 31 Jul 2013 10:31 AM PDT

Scientists suggest that the 1960s eruption of Costa Rica's largest stratovolcano was triggered by magma rising from the mantle over a few short months, rather than thousands of years or more, as many scientists have thought.

Bird brains predate birds themselves: 'Flight-ready' brain was present in some non-avian dinosaurs, CT scans indicate

Posted: 31 Jul 2013 10:31 AM PDT

New research provides evidence that dinosaurs evolved the brainpower necessary for flight well before they actually took to the air as birds. Based on computed tomographic scans, the study takes a comprehensive look at the so-called "bird brain," revealing that at least a few non-avian dinosaurs had brains that were as large or larger than that of one of the earliest known birds, Archaeopteryx.

Digest this: Cure for cancer may live in our intestines

Posted: 31 Jul 2013 10:31 AM PDT

Treating a cancerous tumor is like watering a houseplant with a fire hose -- too much water kills the plant, just as too much chemotherapy and radiation kills the patient before it kills the tumor. However, if the patient's gastrointestinal tract remains healthy and functioning, the patient's chances of survival increase exponentially.

Flexible tail of the prion protein poisons brain cells

Posted: 31 Jul 2013 10:31 AM PDT

Prion proteins are the infectious pathogens that cause Mad Cow Disease and Creutzfeldt-Jakob disease. They occur when a normal prion protein becomes deformed and clumped. The naturally occurring prion protein is harmless and can be found in most organisms. In humans, it is found in our brain cell membrane. By contrast, the abnormally deformed prion protein is poisonous for the brain cells. Scientists have now discovered that the prion protein has a kind of switch that controls its toxicity.

Cross-country collaboration leads to new leukemia model

Posted: 31 Jul 2013 09:29 AM PDT

They were postdocs at Stanford when they first began considering the problem. Eight years later, and a continent apart, they found the answer.

Using gold and light to study molecules in water

Posted: 31 Jul 2013 09:29 AM PDT

Thanks to a new device that is the size of a human hair, it is now possible to detect molecules in a liquid solution and observe their interactions. This is of major interest for the scientific community, as there is currently no reliable way of examining both the behavior and the chemical structure of molecules in a liquid in real time.

Robots strike fear in the hearts of fish: Anxious zebrafish help researchers understand how alcohol affects fear

Posted: 31 Jul 2013 09:29 AM PDT

The latest in a series of experiments testing the ability of robots to influence live animals shows that bio-inspired robots can not only elicit fear in zebrafish, but that this reaction can be modulated by alcohol. These findings may pave the way for new methodologies for understanding anxiety and other emotions, as well as substances that modulate them.

New therapy improves life span in melanoma patients with brain metastases

Posted: 31 Jul 2013 09:29 AM PDT

The treatment, given to patients with brain metastases, triggers the body's own immune system to recognize and destroy cancer cells.

Physicists discover theoretical possibility of large, hollow magnetic cage molecules

Posted: 31 Jul 2013 09:29 AM PDT

Researchers have discovered, in theory, the possibility of creating large, hollow magnetic cage molecules that could one day be used in medicine as a drug delivery system to non-invasively treat tumors, and in other emerging technologies.

Promising new direction for organ regeneration and tissue repair

Posted: 31 Jul 2013 09:28 AM PDT

Researchers have identified an entirely new approach to enhance tissue growth, findings that could lead to advances in organ regeneration and tissue repair, with widespread therapeutic applications.

Sediment trapped behind dams makes them 'hot spots' for greenhouse gas emissions

Posted: 31 Jul 2013 09:28 AM PDT

With the "green" reputation of large hydroelectric dams already in question, scientists are reporting that millions of smaller dams on rivers around the world make an important contribution to the greenhouse gases linked to global climate change. Their study shows that more methane than previously believed bubbles out of the water behind small dams.

Researchers successfully spoof an $80 million yacht at sea

Posted: 31 Jul 2013 09:28 AM PDT

A radio navigation research team discovered they could subtly coerce a 65-meter superyacht off its course, using a custom-made GPS device. The purpose of the experiment was to measure the difficulty of carrying out a spoofing attack at sea and to determine how easily sensors in the ship's command room could identify the threat.

Guided growth of nanowires leads to self-integrated circuits

Posted: 31 Jul 2013 09:28 AM PDT

Teaching nanowires self-control from the outset enabled scientists to produce complex electronic nanocomponents.

New protein discovered with vast potential for treatment of cancer and other diseases

Posted: 31 Jul 2013 09:28 AM PDT

In cancer research, discovering a new protein that plays a role in cancer is like finding a key and a treasure map: follow the clues and eventually there could be a big reward. At least that's the hope from a new study that discovered a novel protein called ceramide-1 phosphate transport protein.

3-D molecular syringes: Scientists solve structure of infection tool used by Yersinia bacterium

Posted: 31 Jul 2013 09:28 AM PDT

Abdominal pain, fever, diarrhea -- these symptoms could point to an infection with the bacterium Yersinia. Its pathogenic potential is based on a syringe-like injection apparatus called injectisome. Scientists have now unraveled this molecular syringe's spatial conformation. The researchers demonstrated that the length of Yersinia's injectisome's basal body, which crosses the bacterial cell wall, is adjustable -- very likely an adaptation to physical stress.

Gene decoding obeys road traffic rules

Posted: 31 Jul 2013 09:28 AM PDT

Scientists show that a proper distance between "vehicles" along a gene "track" results in more efficient production of small RNA molecules.

Tiny, brightly shining silicon crystals could be safe for deep-tissue imaging

Posted: 31 Jul 2013 09:26 AM PDT

Tiny silicon crystals caused no health problems in monkeys three months after large doses were injected, marking a step forward in the quest to bring such materials into clinics as biomedical imaging agents, according to a new study.

By tracking maggots' food choices, scientists open significant new window into human learning

Posted: 31 Jul 2013 09:26 AM PDT

The larva of the fruit fly is helping scientists understand the way humans learn information from each other. Fruit flies have long served as models for studying behavior, but new findings show their larvae may be even more valuable. Researchers were able to demonstrate that the larvae, or maggots, are capable of social learning, which opens the door to many other experiments that could provide valuable insights into human behavior.

Surprising result discovered when looking into effects of carbon nanotubes and soil sorption of toxicants

Posted: 31 Jul 2013 09:25 AM PDT

When it comes to carbon nanotubes (CNTs) in the soil, recent research shows that the new materials do not affect the sorption of the toxic part of oil called polycyclic aromatic hydrocarbons (PAHs).

Key factors for wireless power transfer

Posted: 31 Jul 2013 09:25 AM PDT

What happens to a resonant wireless power transfer system in complex electromagnetic environments? Researchers explored the influences at play in this type of situation and describe how efficient wireless power transfer can be achieved in the presence of metal plates.

Saturn's Mimas and Pandora: Two moons passing in the night

Posted: 31 Jul 2013 08:30 AM PDT

The Saturn moons Mimas and Pandora remind us of how different they are when they appear together, as in this image taken by NASA's Cassini spacecraft. Pandora's small size means that it lacks sufficient gravity to pull itself into a round shape like its larger sibling, Mimas. Researchers believe that the elongated shape of Pandora (50 miles, or 81 kilometers across) may hold clues to how it and other moons near Saturn's rings formed.

Progress in using ethanol to make key raw material now produced from oil

Posted: 31 Jul 2013 07:57 AM PDT

Ethanol from corn and other plants could become the sustainable, raw material for a huge variety of products, from plastic packaging to detergents to synthetic rubber, that are currently petroleum-based.

Insect-inspired super rubber moves toward practical uses in medicine

Posted: 31 Jul 2013 07:56 AM PDT

The remarkable, rubber-like protein that enables dragonflies, grasshoppers and other insects to flap their wings, jump and chirp has major potential uses in medicine, scientists conclude. A new article evaluates the latest advances toward using a protein called resilin in nanosprings, biorubbers, biosensors and other applications.

Computational biology: Cells reprogrammed on the computer

Posted: 31 Jul 2013 07:55 AM PDT

Scientists have developed a model that makes predictions from which differentiated cells -- for instance skin cells -- can be very efficiently changed into completely different cell types -- such as nerve cells, for example. This can be done entirely without stem cells. These computer-based instructions for reprogramming cells are of huge significance for regenerative medicine.

Studying the emotions which cause opinions to change

Posted: 31 Jul 2013 07:41 AM PDT

Physicists can use their tools to help understand how, in real life, opinions form and change.

Sensitive parenting can boost premature children's school performance

Posted: 31 Jul 2013 07:41 AM PDT

Sensitive parenting helps protect against the negative effects of being born prematurely on children's school success, a new study has found.

Polar ecosystems acutely vulnerable to sunlight-driven tipping points

Posted: 31 Jul 2013 06:39 AM PDT

Slight changes in the timing of the annual loss of sea-ice in polar regions could have dire consequences for polar ecosystems, by allowing a lot more sunlight to reach the sea floor. The research predicts biodiversity on some areas of the polar seabed could be reduced by as much as one third within decades, as the poles warm.

Scientists analyze genetic makeup of human and mouse embryos in amazing detail

Posted: 31 Jul 2013 06:39 AM PDT

Scientists have used the powerful technology of single-cell RNA sequencing to track the genetic development of a human and a mouse embryo at an unprecedented level of accuracy. The success of this technique could lead to genetic diagnoses of diseases with higher resolution and in embryos earlier than ever achieved before, even when the embryo consists of only eight cells.

Ancient viruses that function in early human development may play role in cancer

Posted: 31 Jul 2013 06:39 AM PDT

Novel non-coding parts of the human genome known as vlincRNAs (very long intergenic, non-coding RNAs) triggered by ancient viruses, participate in the biology of stem cells, and in the development of cancer. Importantly, scientists found that the elimination of these vlincRNAs caused the death of cancer cells.

Hide, ambush, kill, eat: The giant water bug Lethocerus patruelis kills a fish

Posted: 31 Jul 2013 06:39 AM PDT

The largest European water insect Lethocerus patruelis, commonly known as giant water bug, can reach the impressive size of up to 8 cm in length. A recent study provides detailed information on karyotype and the reproductive system of the species. The study also presents a rare opportunity to see their vicious predatory practices, catching a giant water bug larva attacking and killing a small fish on video.

Autism symptoms not explained by impaired attention

Posted: 31 Jul 2013 06:37 AM PDT

Two aspects of attention -- reorienting focus and attending to social information -- do not seem to account for the diversity symptoms seen in autistic children, according to new research.

BPA exposure disrupts human egg maturation

Posted: 31 Jul 2013 06:37 AM PDT

Exposure to BPA (Bisphenol-A) could be a contributing factor as to why some infertile couples are having difficulty conceiving.

Chemists develop innovative nano-sensors for multiple proteins

Posted: 31 Jul 2013 06:35 AM PDT

Chemists have developed a new method for parallel protein analysis that is, in principle, capable of identifying hundreds or even thousands of different proteins. It could be used to detect the presence of viruses and identify their type in tiny samples. At the same time, it is very cost-effective and quick.

Could planting trees in the desert mitigate climate change?

Posted: 31 Jul 2013 06:34 AM PDT

As the world starts feeling the effects of increasing atmospheric carbon dioxide and consequent global temperature rise, researchers are looking for a Plan B to mitigate climate change. A group of German scientists has now come up with an environmentally friendly method that they say could do just that. The technique, dubbed carbon farming, consists in planting trees in arid regions on a large scale to capture carbon dioxide.

Dawn of carnivores explains animal boom in distant past

Posted: 31 Jul 2013 06:33 AM PDT

Scientists have linked increasing oxygen levels and the rise and evolution of carnivores (meat eaters) as the force behind a broad explosion of animal species and body structures millions of years ago.

Naked mole rat's secret to staying cancer free

Posted: 31 Jul 2013 06:32 AM PDT

Scientists have discovered the naked mole rat's unique mechanism to staying cancer free -- a super sugar called high-molecular-mass Hyaluronan (HMM-HA). When secreted by the naked mole rat's cells, this molecule prevents cells from overcrowding and forming tumors. Researchers now say using naked mole-rat HMM-HA in the clinic could open up new avenues for cancer prevention and life extension in humans.

Stem cells in urine easy to isolate and have potential for numerous therapies

Posted: 31 Jul 2013 06:32 AM PDT

Could harvesting stem cells for therapy one day be as simple as asking patients for a urine sample? Researchers have identified stem cells in urine that can be directed to become multiple cell types.

ليست هناك تعليقات:

إرسال تعليق