Chemistry
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(EN) - Atmospheric Chemistry Glossary | shsu.edu

(EN) - Atmospheric Chemistry Glossary | shsu.edu | Chemistry | Scoop.it

"Words and phrases used in atmospheric chemistry and environmental studies

 

This is the 2012 version of this glossary. The definitions in this glossary were initially generated by the students in a senior-level class studying air quality and atmospheric chemistry at Sam Houston State University during the spring of 1995 in a course entitled Environmental Science 440/Chemistry 442, AIR QUALITY. In the main, they wrote these definitions as part of a class requirement and that process has continued. They are updated almost every year. The references found at the end of most entries are an effort to supply additional resources for each of the terms. No supposition of comprehensiveness or absolute correctness can be assumed in any way. Many of the glossary entries have hypertext links to other sites on the Internet. These external links were valid in the ..."


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Walking in the woods with quantum chemistry – applications of quantum chemical calculations in natural products research

Walking in the woods with quantum chemistry – applications of quantum chemical calculations in natural products research | Chemistry | Scoop.it

This Highlight describes applications of quantum chemical calculations to problems in natural products chemistry, including the elucidation of natural product structures (distinguishing between constitutional isomers, distinguishing between diastereomers, and assigning absolute configuration) and determination of reasonable mechanisms for their formation.

 

Dean J. Tantillo

Nat. Prod. Rep., 2013, Advance Article


DOI: 10.1039/C3NP70028C


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Nivetetracyclates A and B: Novel Compounds Isolated from Streptomyces niveus

Nivetetracyclates A and B: Novel Compounds Isolated from Streptomyces niveus | Chemistry | Scoop.it

A high-throughput screening of a microbial natural product library led to the discovery of two novel compounds named nivetetracyclates A and B (1 and 2), which were produced byStreptomyces niveus designated as LS2151. The backbone of the compounds contains a hydrotetracyclate not previously reported from a natural source. The structures of the compounds were elucidated by spectroscopic methods. The nivetetracyclates exhibited activity against human HeLa cells

 

Caixia Chen †, Xueting Liu †, Wael M. Abdel-Mageed†‡, Hui Guo , Weiyuan Hou §, Marcel Jaspars , Li Li, Feng Xie †, Biao Ren †, Qian Wang †, Huanqin Dai†, Fuhang Song *†, and Lixin ZhangOrg. Lett., Article ASAPDOI: 10.1021/ol4027733Publication Date (Web): October 25, 2013


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Investors Look for Chemistry, Not Just Big Ideas

Investors Look for Chemistry, Not Just Big Ideas | Chemistry | Scoop.it
VC Fred Wilson says the quality of your ideas matter to investors. But your relationships with them matter more.

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One-dimensional chemistry inside carbon nanotubes offers surprising wealth of new reactivity options

One-dimensional chemistry inside carbon nanotubes offers surprising wealth of new reactivity options | Chemistry | Scoop.it

When scientists from Umea University and Aalto University tried to perform a reaction between hydrogen gas and fullerene molecules encapsulated in nanotubes something very unlikely suddenly appeared possible. They discovered direct evidence that molecules inside of SWNts can be reacted with gases. This finding opens enormous possibilities for synthesis of novel hybrid materials and chemical modification of encapsulated molecules and materials.


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The Chemistry of Cookies

The Chemistry of Cookies | Chemistry | Scoop.it
Have you ever wondered what chemical processes occur in the oven, as your cookies are baking? Of course you haven't, which is exactly why you'll find this video fascinating.

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VIDEO: "You can ban drugs, but you can't ban chemistry" by @mrmichaelpowe

From the Silk Road to Shanghai legal highs labs, drugs of all kinds have never been easier to get -- and it's all thanks to the web. Speaking at the HIT Hot ...

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(EN) - Chemistry Dictionary | nas.net

(EN) - Chemistry Dictionary | nas.net | Chemistry | Scoop.it

"Chemistry Dictionary (nas.net)"


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The Power of Business Chemistry

The Power of Business Chemistry | Chemistry | Scoop.it

It happens all the time. You walk into a meeting anticipating a clear resolution only to encounter someone who asks to bring others into the equation; or someone who insists on crunching more data; or someone who simply has a better idea. Sound familiar? As CFO, juggling such diverse stakeholder personalities comes with the territory.

Luckily, there are clues to deciphering personalities in business that can help CFOs better relate to others. Termed “Business Chemistry,” the framework identifies distinct patterns of behavior that can be harnessed to not only improve individual interactions, but also to influence strategy.

 

Download the CFO Insights article, "The Power of Business Chemistry," to learn more..


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Rim Riahi's curator insight, May 28, 2013 3:31 AM

It happens all the time. You walk into a meeting anticipating a clear resolution only to encounter someone who asks to bring others into the equation; or someone who insists on crunching more data; or someone who simply has a better idea. Sound familiar? As CFO, juggling such diverse stakeholder personalities comes with the territory.

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Chem Collective - Resources to Teach and Learn Chemistry

Chem Collective - Resources to Teach and Learn Chemistry | Chemistry | Scoop.it

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Pascale Klinger's curator insight, November 19, 2013 1:48 PM

Its the periodic table, amazing. 

Ramanathan's curator insight, August 8, 2014 11:58 PM

It is a very good site for teachers.

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Open Chemistry

Open Chemistry | Chemistry | Scoop.it

The Open Chemistry project is a collection of open source, cross platform libraries and applications for the exploration, analysis and generation of chemical data. The project builds upon various efforts by collaborators and innovators in open chemistry such as the Blue Obelisk, Quixote and the associated projects. We aim to improve the state of the art, and facilitate the open exchange of ideas and exchange of chemical data leveraging the best technologies ranging from quantum chemistry codes, molecular dynamics, informatics and visualization.


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On the Histone Lysine Methyltransferase Activity of Fungal Metabolite Chaetocin

On the Histone Lysine Methyltransferase Activity of Fungal Metabolite Chaetocin | Chemistry | Scoop.it

Histone lysine methyltransferases (HKMTs) are an important class of targets for epigenetic therapy. 1 (chaetocin), an epidithiodiketopiperazine (ETP) natural product, has been reported to be a specific inhibitor of the SU(VAR)3-9 class of HKMTs. We have studied the inhibition of the HKMT G9a by 1 and functionally related analogues. Our results reveal that only the structurally unique ETP core is required for inhibition, and such inhibition is time-dependent and irreversible (in the absence of DTT), ultimately resulting in protein denaturation. Mass spectrometric data provide a molecular basis for this effect, demonstrating covalent adduct formation between 1 and the protein. This provides a potential rationale for the selectivity observed in the inhibition of a variety of HKMTs by 1 in vitro and has implications for the activity of ETPs against these important epigenetic targets.

 

Fanny L. Cherblanc †, Kathryn L. Chapman ‡, Jim Reid §, Aaron J. Borg , Sandeep Sundriyal †, Laura Alcazar-Fuoli , Elaine Bignell , Marina Demetriades #, Christopher J. Schofield #, Peter A. DiMaggio , Jr, Robert Brown , and Matthew J. FuchterJ. Med. Chem., Article ASAPDOI: 10.1021/jm401063rPublication Date (Web): October 7, 2013


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Impact of copper-catalyzed cross-coupling reactions in natural product synthesis: the emergence of new retrosynthetic paradigms

Impact of copper-catalyzed cross-coupling reactions in natural product synthesis: the emergence of new retrosynthetic paradigms | Chemistry | Scoop.it

 

DOI: 10.1039/C3NP70071B Copper-catalyzed Ullmann–Goldberg-type cross-coupling reactions have undergone nothing short of a renaissance over the last decade and an impressive number of procedures are now available for the formation of C–N, C–O and C–S bonds with remarkable efficiencies and surgical precision. These reactions have been recently integrated into natural product synthesis, which clearly resulted in the emergence of new retrosynthetic paradigms and bond disconnections. The impact of copper-catalyzed cross-coupling reactions in natural product synthesis will be overviewed in this article with an emphasis on the evolution of strategies due to copper catalysis, mostly by comparison with alternative tactics and their relative efficiencies.

 

 

 

Gwilherm Evano,*a   Cédric Theunissena and   Alexandre Pradala   Nat. Prod. Rep., 2013, Advance Article

 


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Chemistry professor developing sustainable bioplastics

Chemistry professor developing sustainable bioplastics | Chemistry | Scoop.it

A Colorado State University chemistry professor has developed several patent-pending chemical processes that would create sustainable bioplastics from renewable resources for use on everything from optical fibers and contact lenses to furniture and automobile parts.


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Biosynthesis of Ambiguine Indole Alkaloids in Cyanobacterium Fischerella ambigua

Biosynthesis of Ambiguine Indole Alkaloids in Cyanobacterium Fischerella ambigua | Chemistry | Scoop.it

Ambiguines belong to a family of hapalindole-type indole alkaloid natural products, with many of the members possessing up to eight consecutive carbon stereocenters in a fused pentacyclic 6-6-6-5-7 ring scaffold. Here, we report the identification of a 42 kbp ambiguine (amb) biosynthetic gene cluster that harbors 32 protein-coding genes in its native producer Fischerella ambigua UTEX1903. Association of the amb cluster with ambiguine biosynthesis was confirmed by both bioinformatic analysis and in vitro characterizations of enzymes responsible for 3-((Z)-2′-isocyanoethenyl) indole and geranyl pyrophosphate biosynthesis and a C-2 indole dimethylallyltransferase that regiospecifically tailors hapalindole G to ambiguine A. The presence of five nonheme iron-dependent oxygenase coding genes (including four Rieske-type oxygenases) within the amb cluster suggests late-stage C–H activations are likely responsible for the structural diversities of ambiguines by regio- and stereospecific chlorination, hydroxylation, epoxidation, and sp2–sp3 C–C bond formation.

 

Matthew L. Hillwig, Qin Zhu, and Xinyu Liu*ACS Chem. Biol., Article ASAPDOI: 10.1021/cb400681nPublication Date (Web): November 1, 2013


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Basic Rules of Chemistry Can Be Broken Under High Pressure, Calculations Show

Basic Rules of Chemistry Can Be Broken Under High Pressure, Calculations Show | Chemistry | Scoop.it
A study suggests atoms can bond not only with electrons in their outer shells, but also via those in their supposedly sacrosanct inner shells

 

Inside atoms, electrons are organized into energy levels, called shells, which can be thought of as buckets of increasing size that can each hold only a fixed number of electrons. Atoms prefer to have filled buckets, so if their outer shell is missing just one or two electrons, they are eager borrow form another atom that might have one or two to spare. But sometimes, a new study suggests, atoms can be incited to share not just their outer valence electrons, but those from their full inner shells. “It breaks our doctrine that the inner-shell electrons never react, never enter the chemistry domain,” says Mao-sheng Miao, a chemist at the University of California, Santa Barbara, and the Beijing Computational Science Research Center in China. Miao predicted such bonds using so-called first-principles calculations, which rely purely on the known laws of physics, and reported his findings in a paper published September 23, 2013, in Nature Chemistry. Such bonding has yet to be demonstrated in a lab. Nevertheless, “I’m very confident that this is real,” he says.

 

His calculations show that two possible molecules could form between cesium and fluorine atoms under extremely high pressure—about 30 gigapascals (higher than the pressure at the bottom of the ocean, but less than at Earth’s center). Cesium, all the way on the left side of the periodic table, has one superfluous electron in its outer, or sixth shell. Fluorine, on the other hand, is toward the far right of the table, just next to the column of noble gases with completely full shells (which is why noble gases are notoriously unreactive—they have little incentive to gain or lose electrons) and is one electron short of a full outer shell. “Under normal pressure, cesium gives an electron completely to fluorine and they bind together,” Miao says. “But under high pressure, the electrons from cesium’s inner shells start to form molecules with fluorine.”

 

Miao identified two compounds that could form and remain stable up to very high pressures: cesium trifluoride (CsF3), where cesium has shared its one valence electron and two from an inner shell with three fluorine atoms, and cesium pentafluoride (CsF5), where cesium shares its valence electron and four inner-shell electrons to five fluorine atoms. “That forms a very beautiful molecule, like a starfish,” Miao says. Both the shape of the resulting molecules and the possibility of their formation are “very surprising,” says chemist Roald Hoffmann, a professor emeritus at Cornell University, who was not involved in the calculations. “This is the first clear case of an alkali metal not only losing its single easily ionized valence electron in bonding, but also ‘breaking into the core’ in its bonding with several fluorines.”

 


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Introducing Wolfram|Alpha’s Step-by-step for Chemistry!

Introducing Wolfram|Alpha’s Step-by-step for Chemistry! | Chemistry | Scoop.it
Wolfram|Alpha now offers its Step-by-step solutions for Chemistry too—learn more about where to put those chemical bonds, and why!

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pH and pOH - A Crash Course in Chemistry

pH and pOH - A Crash Course in Chemistry | Chemistry | Scoop.it

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Ramanathan's curator insight, August 8, 2014 11:59 PM

Acids and bases - pH and pOH

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A Common Origin for Guanidinobutanoate Starter Units in Antifungal Natural Products

A Common Origin for Guanidinobutanoate Starter Units in Antifungal Natural Products | Chemistry | Scoop.it

Keeping it basic: Arginine provides the exotic 4-guanidinobutanoate starter unit for two different types of zwitterionic polyketide (an example for one type is shown in the picture) produced by the same Streptomyces bacterium. The three-step precursor pathway is initiated by a remarkable decarboxylating monooxygenase with high specificity for arginine.

 

Dr. Hui Hong1,*,Taicia Fill2,Prof. Peter F. Leadlay

 

Angewandte Chemie International Edition

 

Article first published online: 11 NOV 2013

DOI: 10.1002/anie.201308136


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