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IdeaPark is a dynamic, online resource that supports early years and K-3 educators with a suite of planning tools, resources and professional learning opportunities. Miniature self-assembling "flasks" created at the Weizmann Institute may prove a useful tool in research and industry. As reported in Nature Nanotechnology, when the scientists trapped molecules that tend to react with one another inside the nanoflasks, they found that the chemical reaction ran a hundred times faster than the same reaction taking place in solution.
Although clusters of nanoparticles containing empty spaces have been created before, the advantage of the Weizmann Institute method is that the clusters are dynamic and reversible, so molecules can be inserted and released on demand. For future industrial use, the nanoflasks may prove useful in speeding up numerous chemical reactions, such as polymerization reactions needed for the manufacture of plastics. More efficient medical treatments could be developed thanks to a new method for triggering the rearrangement of chemical particles. Ludwig Maximilian University chemists have demonstrated a simple way to load nanoglobules with light-absorbing organic molecules. Australian and Italian researchers have developed a smart sensor that can detect single molecules in chemical and biological compounds a€“ a highly valued function in medicine, security and defence. Researchers can build complex, nanometer-scale structures of almost any shape and form, using strands of DNA.
Among the valuable holdings in London's Wellcome Library is a rough pencil sketch made in 1953 by Francis Crick. UK researchers have discovered a new way of observing designer nanomaterials a€“ materials 400 times smaller than a human hair. Bathing a patient in LED light may someday offer a new way to locate tumors, according to Rice University researchers.


Rice University scientists have advanced their graphene-based de-icer to serve a dual purpose. Presentation on theme: "Chapter 1 - section 3: Chemical Compounds in cells What is air made up of? Chapter 1-section 4: The Cell in its Environment How is the cell membrane like a gatekeeper? Key Idea #11 Cells in multicellular organisms are specialized to take in nutrients, which are used to make the materials that a cell or organism needs. Sigrid Kaag, head of the joint Organisation for the Prohibition of Chemical Weapons-United Nations mission for the destruction of Syria’s chemical weapons, said the Syrian government plans to accelerate the weapons removal and destruction in order to complete the process on schedule.
The Syrian government is recovering from delays in reliquishing its chemical weapons and can still meet the deadline for their entire removal, an official said on Tuesday. Sigrid Kaag, who heads the joint Organization for the Prohibition of Chemical Weapons-United Nations mission, said Syria agreed to a 60-day timeframe to accelerate the weapons removal and destruction.
The international community is working in coordination to destroy about 1,300 metric tons of chemicals.
Syria had missed deadlines in December and February to turn over its chemical weapons, including mustard gas. PBS NewsHour allows open commenting for all registered users, and encourages discussion amongst you, our audience. The Rundown offers the NewsHour's unique perspective on the important events of the day with insights from the journalists you trust. 1Shields and Brooks on Obama’s historic Hiroshima visit 2Trump vows to 'open up the water' in drought-stricken California 3New ‘superbug’ becomes first drug-proof bacteria to hit U.S.
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The nanoflasks, which have a span of several nanometers, or millionths of a millimeter, can accelerate chemical reactions for research.
Rafal Klajn of the Weizmann Institute's Organic Chemistry Department and his team were originally studying the light-induced self-assembly of nanoparticles. Being confined inside the nanoflasks greatly increased the concentration of the molecules and organized them in a way that caused them to react more readily.


The cluster can be disassembled (right), releasing molecules that were trapped in its nanoflasks. The clusters self-assemble when nanoparticles are exposed to ultraviolet light, but exposure to regular light causes them to disassemble, so that the same nanoparticles can be reused in numerous cycles. Reversible trapping and reaction acceleration within dynamically self-assembling nanoflasks, Nature Nanotechnology (2015). However, if a commenter violates our terms of use or abuses the commenting forum, their comment may go into moderation or be removed entirely. In the future, they might facilitate the manufacture of various industrial materials and perhaps even serve as vehicles for drug delivery. They were employing a method earlier developed by Klajn in which inorganic nanoparticles are coated in a single layer of organic molecules that change their configuration when exposed to light; these alter the properties of the nanoparticles such that they self-assemble into crystalline clusters.
Enzymes speed up chemical reactions in a similar manner - by confining the reacting molecules within a pocket. Moreover, the scientists found that by decorating their nanoparticles with a mixture of different chemicals, they could trap molecules inside the nanoflasks in a highly selective manner.
The drug would be delivered inside nanoflasks to the target organ and released at the required time when the nanoflasks would disassemble upon exposure to light. Under its revised proposal, Syria would hand over all chemical weapons by the end of April to have other countries destroy them by the June deadline. When spherical nanoparticles of gold or other materials self-assembled into a cluster, empty spaces formed between them, like those between oranges packed in a case.
For example, from a mixture of spiral-shaped molecules, they could cause left- or right-handed spirals to be trapped, a skill that can be particularly important for drug synthesis.
Klajn and his team members realized that the empty spaces sometimes trapped water molecules, which led them to suggest that they could also trap "guest" molecules of other materials and function as tiny flasks for chemical reactions. By submitting comments, you agree to the PBS Terms of Use and Privacy Policy, which include more details.



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