明星资讯腾讯娱乐2017年06月27日 13:24:02
What happens when lithium-ion batteries overheat and explode has been tracked inside and out for the first time by a UCL-led team using sophisticated 3D imaging. Understanding how Li-ion batteries fail and potentially cause a dangerous chain reaction of events is important for improving their design to make them safer to use and transport, say the scientists behind the study.Cells have devised many structures for transporting molecular cargo across their protective borders, but the nuclear pore complex, with its flower-like, eight-fold symmetry, stands out. Monstrously large by cellular standards, as well as versatile, this elaborate portal controls access to and exit from the headquarters of the cell, the nucleus. In research published June 4 in Cell, Rockefeller University scientists have uncovered crucial steps in the dynamic dance that dilates and constricts the nuclear pore complex -- the latest advance in their ongoing efforts to tease apart the mechanism by which its central channel admits specific molecules. Their work, based on quantitative biophysical data, has revealed that the nuclear pore complex is much more than the inert structure it was once thought to be.

Mr Cameron said the 7 July London bombings, which killed 52 on London's public transport system in 2005, meant the two countries shared ;the same determination to fight terrorism and to ensure that these evil deeds will never win;.

The study shows a strong overlap between chemicals found in biological samples taken from the human population and those detected in municipal biosolids. These findings suggest that analysis of sludge may provide a useful surrogate for the assessment of human exposure and bioaccumulation of potentially hazardous substances.

  As a result, online advertising revenues for internet firms have been rising.

  Scientists have known for decades that the bubbles in glaciers form when snow crystals trap pockets of air and then get slowly squashed down under the weight of more snow. As the snow is compacted it turns into ice and the air bubbles become pressurized. The regular way the bubbles form means that they are evenly distributed throughout the ice, an important characteristic if you want to use the sound intensity of bubble squirts to measure ice melt rate.。

  The study found the 9-Valent vaccine, under the trademark of Gardasil-9, also has the potential to protect against an additional 8 percent of oropharyngeal cancers, which include the base of the tongue and tonsils. This disease is the second-most-common HPV-associated cancer.

  Gradually, the fierce stellar winds from the youngest, most massive stars blow away the gas, revealing bright blue star clusters and giving a ;Swiss Cheese; appearance to the spiral arms. These youngest star clusters are about 1 million to 10 million years old. The populations of stars up to 100 million years or older appear yellow or orange by comparison because the young blue stars have already burned out.;This value has remained stable for the past several decades, leading to the conclusion that it represents a planetary boundary -- an upper limit on global biomass production,; the researchers wrote.;Nine hundred million people already go hungry and 2 billion people are malnourished in spite of the fact that per capita food production continues to increase,; they said. ;With 70% of all available water being in agriculture, growing more food to feed an additional 2 billion people by 2050 will place greater pressure on available water and land.;

  Unlike previous urban biodiversity research, this study looks beyond the local impacts of urbanization and considers overall impacts on global biodiversity. The research team created the largest global dataset to date of two diverse taxa in cities: birds (54 cities) and plants (110 cities).Which detergent for which coating?

  The study followed 69 patients with COPD for six months; it was conducted at the Veterans Affairs Western New York Healthcare System (Buffalo VA) by researchers at the UB medical school.

  Researchers also analyzed stable isotopes and bone shape, finding that these animals most likely fed on land and were large and lumbering, but spent a considerable amount of time near water, similar to modern rhinos and tapirs. Dr. Lisa Noelle Cooper added, ;Anthracobunids are just one of many lineages of vertebrates that evolved from terrestrial animals, but then left to live in a shallow water habitat and had thick bones. These thick bones probably acted like ballast to counteract body buoyancy. You can see that kind of bone structure in modern hippos, otters, penguins, and cormorants.;。

  Days of tension led up to the declaration of the result after Egypt's ruling military council gave itself sweeping powers.

  That's a decline in the western Arctic of about a third, and snowpack in the Beaufort and Chukchi seas less than half as thick in spring in recent years compared to the average Soviet-era records for that time of year.

  In a spirit of gratitude and giving back to the parents who raised them, Bill and Jackie Merz's daughters have extended a generous invitation.

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