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New Super-Heavy Element 117 Confirmed


The periodic table has been extended, with the announcement of the confirmation of the yet to be named element 117.

In 2010 a US Russian collaboration announced they had produced atoms of an element with 117 protons, filling a gap that appeared when 118 was made four years earlier. However International Union of Pure and Applied Chemistry (IUPAC) insists on corroboration by two independent teams before it allows new elements to be added to the Periodic Table, although a temporary name of Ununseptium is in use until confirmation has been made. It has taken four years, but this appears to have finally arrived.

Hinde was part of a team at the GSI laboratory in Germany who fused calcium 48 and berkelium 249. This is not easy, because berkelium 249 is both hard to produce in substantial quantities and has a half life of 320 days. Less than half of any amount produced will still be around a year after it was made, which means transportation and purification can't wait. The resulting product, like all atoms heavier than lead, was unstable. By watching the alpha particles emitted the team concluded that these were the product of two decay chains, both originating with 294117, that is an atom with 117 protons and 177 neutrons. One of the chains included the isotopes 270Db and266Lr, the latter adding four neutrons to the previous highest isotope of lawrencium.

In general large atoms have shorter half lives, that is decay more quickly through radiation, as their masses become greater. However, what are know as islands of stability exist, and the authors believe the one hour half life of 270Db "marks an important step towards the observation of even more long-lived nuclei of superheavy elements located on an "island of stability.'"

The manufacturing process was hardly efficient. More than 1019 atoms of 48Ca, not a common isotope in its own right, were fired at the berkelium to produce just four atoms of 117. Nevertheless, Hinde says, "On the basis of this paper it is likely that element 117 will be accepted."

Element 117 is the most recent of six elements first announced by the Joint Institute for Nuclear Research in Russia. Of these 113, 115 and 118 remain unconfirmed, although claims have been made for the first two.

Such a small sample does not allow us to learn much about the chemistry of element 117. Ununseptium's position on the periodic table places it under the halogen gases such as fluorine and chlorine, but the strong capacity to capture electrons that makes these so reactive weakens as you go down the table, and in fact it is thought if one could ever produce enough to observe chemical interactions it would be more likely to lose electrons than gain them .

With a dozen new discoveries since he wrote The Elements, maybe it is time for Tom Lehrer to come out of retirement to add more lines to his song. Well we can hope.

Meanwhile Hinde has still greater dreams. "The big question is, how can we create elements 119 and 120?" To do this, however, a projectile heavier than 48Ca will need to be found. Hinde is working on identifying the best candidate.

Article taken from:
http://www.iflscience.com/chemistry/new-element-confirmed

More Reading at:
» http://news.discovery.com/tech/new-super-heavy...02.htm
» http://en.wikipedia.org/wiki/Ununseptium
 
     
 
 
     
 

Indian Journal of Biotechnology (IJBT) - July 2013 | Courtesy http://www.niscair.res.in/


 
 
     
 
     
 

A Study of Controlled Uptake and Release of Anthocyanins by Oxidized Starch Microgels

 

Publication Date (Web): May 27, 2013
Copyright © 2013 American Chemical Society

Anthocyanins are well-known antioxidants, but they are sensitive to environmental conditions. Herein we used oxidized starch microgel to prevent their early degradation and deliver them to the target place. The aim of this study was to investigate the uptake and the release ability of anthocyanins by the oxidized starch microgels and measure their in vitro gastrointestinal release. The gels were made of oxidized potato starch polymers, which were chemically cross-linked by sodium trimetaphosphate (STMP). In this study, the uptake and release behaviors of anthocyanins by starch microgel were investigated under various pH and salt concentrations. The microgel of high degree of oxidation and high cross-link density had a high uptake capacity for anthocyanins at low pH and salt concentration; 62 mg anthocyanins had been absorbed per gram of dry DO100% (degree of oxidation 100%) microgel at pH 3 with ionic strength 0.05M. The in vitro study of the release was investigated under stimulated gastrointestinal fluid. The anthocyanins were identified and quantified by UV/vis detection. The results indicated that the oxidized starch microgels had a potential for being a carrier system for protecting anthocyanins from degradation in the upper gastric tract and for delivering them to the intestine. This paper provides a good reference for an intestinal-targeted delivery system of vulnerable functional ingredients by oxidized starch microgel.
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Nanotopographic Surfaces with Defined Surface Chemistries from Amyloid Fibril Networks Can Control Cell Attachment

 

Publication Date (Web): May 23, 2013
Copyright © 2013 American Chemical Society

We show for the first time the possibility of using networks of amyloid fibrils, adsorbed to solid supports and with plasma polymer coatings, for the fabrication of chemically homogeneous surfaces with well-defined nanoscale surface features reminiscent of the topography of the extracellular matrix. The robust nature of the fibrils allows them to withstand the plasma polymer deposition conditions used with no obvious deleterious effect, thus enabling the underlying fibril topography to be replicated at the polymer surface. This effect was seen despite the polymer coating thickness being an order of magnitude greater than the fibril network. The in vitro culture of fibroblast cells on these surfaces resulted in increased attachment and spreading compared to flat plasma polymer films with the same chemical composition. The demonstrated technique allows for the rapid and reproducible fabrication of substrates with nanoscale fibrous topography that we believe will have applications in the development of new biomaterials allowing, for example, the investigation of the effect of extracellular matrix mimicking nanoscale morphology on cellular phenotype.
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  First Photo of DNA Helix Taken
 

First Photo of DNA Helix Taken: For the first time, scientists have imaged DNA's iconic spiraling helix. The photo was taken by Enzo di Fabrizio from the University of Genoa, Italy, using an electron microscope. Until now, scientists only knew that DNA was a helix shape because of their knowledge of molecular theory and an imaging technique called X-ray crystallography, which converts patterns of dots into an image. But now they can see the molecule up close and in person.

Di Fabrizio made the image by pulling a strand of DNA between two nanoscopic silicon pillars. An electron microscope bounces electrons off of objects and the energy created is used to make an image, so di Fabrizio needed a way to shine the electrons onto the DNA. To do it, he drilled tiny holes in the base of the nanopillar bed and shone beams of electrons through it. He published the image in the journal Nano Letters

 
     
 
 
     
 
 
     



     
 
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