На главную
Видео добавленное пользователем “CEN Online”
Conductive Silver Ink from a Ballpoint Pen
 
03:33
Materials researchers at the University of Illinois, Urbana-Champaign have developed a highly conductive silver ink. In this video, Analisa Russo, a graduate student in the research group of Professor Jennifer Lewis shows exactly how to make this amazing ink, which could be used for a wide variety of hobby projects and in advanced electronics hardware.
Просмотров: 211454 CEN Online
The 2017 Nobel Prize in Chemistry: Cryo-electron microscopy explained
 
05:00
Jacques Dubochet, Joachim Frank, and Richard Henderson have claimed the 2017 Nobel Prize in Chemistry for their development of cryo-electron microscopy. ↓↓More info and references below↓↓ This year’s winners surprised many people and stirred up the perennial “is this really chemistry?” debate. But the Nobel committee (and the president of the American Chemical Society, Allison Campbell) believes that cryo-EM’s development is firmly entrenched in the central science. Check out our explainer behind the work that’s enabling researchers to image large biomolecules with atomic precision, ushering in a new era of biochemistry. And there was at least one person whom this pick did not surprise. Shout out to Gurunath Ramanathan, a viewer of C&EN’s Nobel Prediction Webinar who submitted this guess: “Cryoelectron microscopy is changing the way in biology. My bet is on analytical chemistry.” Watch the full webinar here: https://www.youtube.com/watch?v=GSGms9DQn7w And be sure to check out these references for more on cryo-EM. Cryo-electron microscopy innovators win 2017 Nobel Prize in Chemistry | C&EN https://cen.acs.org/articles/95/web/2017/10/Cryo-electron-microscopy-innovators-win-2017-Nobel-Prize-in-Chemistry.html The first herpes capsid at atomic resolution | C&EN https://cen.acs.org/articles/95/i27/first-herpes-capsid-atomic-resolution.html Uncovering The Spliceosome’s Secrets | C&EN https://cen.acs.org/articles/93/i39/Uncovering-Spliceosomes-Secrets.html New close-up views of the nuclear pore complex | C&EN https://cen.acs.org/articles/94/i16/New-closeviews-nuclear-pore-complex.html Cryo-electron tomography provides first view of a cell’s nucleus in its natural, undisturbed environment | C&EN https://cen.acs.org/articles/94/i9/Cryo-electron-tomography-provides-first.html Bold, Probably Incorrect Predictions of the Future of X-ray Diffraction | C&EN http://cen.xraycrystals.org/essay-on-the-future-of-crystallography.html The Nobel Prize in Chemistry 2017 | Nobelprize.org https://www.nobelprize.org/nobel_prizes/chemistry/laureates/2017/ Speaking of Chemistry is a production of Chemical & Engineering News (C&EN), the weekly news magazine of the American Chemical Society. Contact us at speakingofchem@acs.org!
Просмотров: 45730 CEN Online
Perovskite solar cells made simply
 
02:58
SIMPLE SETUP Ordinary lab equipment is all that's required to make Perovskite solar cells.
Просмотров: 59444 CEN Online
The Chemistry of Truffles, the Most Expensive Food in the World
 
02:59
Take a crack at our truffle trivia challenge: http://cen.acs.org/articles/93/i36/Makes-Truffles-Enticing-Foodies-Unwittingly.html#truffle-trivia ↓↓Full description and references below↓↓ Although you probably haven’t dropped a cool $60 grand for a truffle, you may have wondered why some people are willing to do so. In this episode, Sarah Everts shows how chemistry fuels the fuss over the fungus…and reveals the shady side of truffle oil. If this episode leaves you wanting more, check out these great resources. What Makes Truffles So Enticing? http://cen.acs.org/articles/93/i36/Makes-Truffles-Enticing-Foodies-Unwittingly.html Truffles: The Most Expensive Food In the World | CBS News http://www.cbsnews.com/news/truffles-the-most-expensive-food-in-the-world/ The Dark Side of the Truffle Trade | The Atlantic http://www.theatlantic.com/international/archive/2014/01/the-dark-side-of-the-truffle-trade/283073/ Want even more Speaking of Chemistry? Like us on facebook: https://www.facebook.com/SpeakingOfChem Or drop us a line at speakingofchem@acs.org Speaking of Chemistry is brought to you by Chemical & Engineering News, the news magazine of the American Chemical Society.
Просмотров: 20546 CEN Online
Growing Synthetic Diamonds
 
03:23
More at http://cenm.ag/carbon. Russell J. Hemley, director of the Geophysical Laboratory at the Carnegie Institution for Science in Washington, D.C., walks through the process for making diamonds in a lab.
Просмотров: 124634 CEN Online
How To Print A 3-D Object With Laser Sintering
 
04:06
For more on 3-D printing: http://cenm.ag/3d This is a step by step guide to the process of laser sintering from researchers at the University of Texas, Austin. This technique, a type of 3-D printing, produces solid objects from polymer and metal powders.
Просмотров: 341481 CEN Online
Inside A Nanocellulose Pilot Plant--From Wood To Nanomaterials
 
01:57
The latest nanomaterials are coming from a seemingly unlikely source--the forest. C&EN Senior Correspondent Mitch Jacoby takes you inside a nanocellulose plant in Madison, Wis., where scientists are extracting these materials from wood pulp. Like C&EN? Want more chemistry video goodness? Subscribe to our YouTube channel: https://www.youtube.com/user/CENonline Subscribe to C&EN to watch science videos with a focus on chemistry, and to hear from the researchers behind it all. -- Looking for C&EN elsewhere on the internet? Homepage: http://cen.acs.org Facebook: http://www.facebook.com/CENews Twitter: http://www.twitter.com/cenmag Tumblr: http://cenwatchglass.tumblr.com Tumblr: http://cenchempics.tumblr.com
Просмотров: 10666 CEN Online
X-ray Photoelectron Spectroscopy
 
02:17
Roy Murray, a graduate student in S. Ismat Shah's group at the University of Delaware department of Materials Science and Engineering, shows us an X-ray Photoelectron Spectroscopy instrument
Просмотров: 22794 CEN Online
Painting Solar Cells with Nanoparticle Paste
 
00:58
For more information, read the C&EN article here: http://cenm.ag/paintable Researchers at Notre Dame have developed a solar cell that is remarkably easy to assemble because the middle layer can be painted onto a clear electrode. First, they mix t-butanol, water, cadmium sulfide and titanium dioxide for 30 minutes. Next, they mask off a clear electrode with office tape. Once the tape is in place, they spread the mixture onto the electode and then anneal it with a heat gun. Finally, they sandwich an electrolyte solution between the new electrode and a graphene composite electrode. And then, it's time for testing under a beam of artificial light. The Paper: http://pubs.acs.org/doi/abs/10.1021/nn204381g
Просмотров: 81794 CEN Online
How to Make Quantum Dots
 
07:37
Charli Dvoracek, a graduate student in Peter Searson's lab at the Johns Hopkins Institute for NanoBioTechnology (INBT) shows us how to make Cadmium Selenide semiconductor nanocrystals, which are better known as quantum dots. These nanoparticles could be used in a wide range of products from cancer tests to solar cells.
Просмотров: 60399 CEN Online
Is it wise to do multiple postdocs?
 
03:03
More at http://cenm.ag/postd. Ph.D. chemists who do more than one postdoctoral stint after finishing their degree--whether for personal reasons or because of the economy-- often face harsh realities in trying to find permanent positions. C&EN Senior Editor Linda Wang spoke to postdocs and experts about this issue at the American Chemical Society National Meeting in New Orleans.
Просмотров: 9938 CEN Online
Sunscreen SPF Explained - Speaking of Chemistry Ep.5
 
02:52
Summertime means slathering on sunscreen, but are all the new sky-high SPF labels that much better at protecting you? Chemical & Engineering News Senior Editor Carmen Drahl and Associate Editor Sophia Cai explain the chemistry behind SPF, so you don't get burned. More reading: J. Chem. Educ., 1998, 75 (6), p 757 DOI: 10.1021/ed075p757 http://pubs.acs.org/doi/abs/10.1021/ed075p757?journalCode=jceda8 Sunscreen-The Burning Facts-EPA http://www.epa.gov/sunwise/doc/sunscreen.pdf What's That Stuff? Sunscreens http://pubs.acs.org/cen/whatstuff/stuff/8025sunscreens.html Sunscreen Delays ($) http://cen.acs.org/articles/92/i19/Sunscreen-Delays.html Lawmakers Want FDA To Act On Sunscreens ($) http://cen.acs.org/articles/92/i22/Lawmakers-Want-FDA-Act-Sunscreens.html Want more chemistry video goodness? Subscribe! http://bit.ly/CENOnline Looking for C&EN elsewhere on the internet? Homepage: http://cen.acs.org Facebook: http://www.facebook.com/CENews Twitter: http://www.twitter.com/cenmag Tumblr: http://cenwatchglass.tumblr.com Tumblr: http://cenchempics.tumblr.com
Просмотров: 27516 CEN Online
How to Avoid Kidney Stones - Speaking of Chemistry
 
02:47
Kidney stones can be excruciatingly painful, and half a million people in the U.S. end up in the emergency room because of them. In this episode of Speaking of Chemistry, guest host Linda Wang explores how kidney stones form and shares some of the most recent research in this area. She even offers tips on how to prevent them. Subscribe! http://bit.ly/CENOnline Speaking of Chemistry is a production of Chemical & Engineering News (C&EN), the weekly magazine of the American Chemical Society. Contact us at speakingofchem@acs.org! Sources: Zinc May Help Drive Kidney Stone Formation Issue Date: June 8, 2015 http://cen.acs.org/articles/93/i23/Zinc-Help-Drive-Kidney-Stone.html?type=paidArticleContent
Просмотров: 19020 CEN Online
What You Need To Know About Microbeads - Speaking of Chemistry Ep. 10
 
02:38
Your toothpaste and face scrub probably get their scrubbing power from tiny plastic beads contained within. In Episode 10 of Speaking of Chemistry, Lauren K. Wolf talks about these polyethylene “microbeads” and why environmental scientists and dentists alike are nervous about them getting into lakes, rivers, and your gums. Like C&EN? Want more chemistry video goodness? Subscribe! Subscribe to C&EN to watch science videos with a focus on chemistry, and to hear from the researchers behind it all. Looking for C&EN elsewhere on the internet? Homepage: http://cen.acs.org Facebook: http://www.facebook.com/CENews Twitter: http://www.twitter.com/cenmag Tumblr: http://cenwatchglass.tumblr.com
Просмотров: 6993 CEN Online
Chem-lapsed: Tomato Juice Rainbow
 
01:58
How can you turn bright-red tomato juice into a rainbow of color? It just takes one extra ingredient -- and some chemistry chops. Just remember, don’t drink the rainbow. For more of the science, check out the throwback Journal of Chemical Education paper here: http://pubs.acs.org/doi/abs/10.1021/ed063p1092 Chem-lapsed is a series of chemistry-themed time-lapses created by Dorea Reeser for C&EN.
Просмотров: 6926 CEN Online
Inside the Indian Generic Drug Manufacturer Cipla
 
02:53
India produces over 30% of the world's entire supply of generic drugs. Cipla is one of India's largest drug manufacturers. It supplies antiretroviral drugs to about one third of AIDS patients under treatment in Africa. C&EN Senior Correspondent Jean-François Tremblay went inside Cipla's advanced pharmaceutical ingredient manufacturing plant to learn more about the stringent regulations it must follow. India's future as the world's drugstore is a controversial topic. Other drugmakers have been heavily fined, or had products recalled or banned, because of problems at plants. And India is under pressure to make its patent system more like those in western nations. But India has found a market for low-cost drugs and that market isn't about to disappear. More at http://cenm.ag/cpla Like C&EN? Want more chemistry video goodness? Subscribe to our YouTube channel: https://www.youtube.com/user/CENonline Subscribe to C&EN to watch science videos with a focus on chemistry, and to hear from the researchers behind it all. -- Looking for C&EN elsewhere on the internet? Homepage: http://cen.acs.org Facebook: http://www.facebook.com/CENews Twitter: http://www.twitter.com/cenmag Tumblr: http://cenwatchglass.tumblr.com
Просмотров: 66130 CEN Online
Soft Robot Takes a Walk
 
03:05
Go to http://cenm.ag/robot to read more about the work featured in this video. Led by chemist George M. Whitesides, researchers at Harvard have developed an all-polymer robot that can undulate, crawl, and navigate obstacles.
Просмотров: 28354 CEN Online
Stop and Smell the Volatile Organic Compounds
 
02:34
C&EN Stories: Smell of roses: http://cen.acs.org/articles/93/i27/Roses-Produce-Sweet-Scent-Through.html Love Stinks: http://cen.acs.org/articles/88/i47/Love-Stinks-Helping-Hand.html Love Potion: http://cen.acs.org/articles/86/i22/Love-Potion.html\ More on petunias: http://www.washington.edu/news/2015/06/29/researchers-discover-how-petunias-know-when-to-smell-good/ Is there anything better than a bouquet of fresh flowers? Well, as it turns out, you’re not the only one who likes the smell of posies --- some flowers use their aroma to attract pollinators. Find out how airborne volatile organic compounds give petunias, roses and the notoriously stinky “corpse flower” their characteristic aromas in the latest Speaking of Chemistry.
Просмотров: 4139 CEN Online
Inside of an NMR Spectrometer
 
03:06
George Furst, Associate Director Tech. Facilities at the University of Pennsylvania in Philadelphia, gives a tour of a deconstructed 200 MHz NMR. Filmed and edited by Kirk Zamieroski
Просмотров: 15697 CEN Online
Metal Organic Frameworks
 
01:57
Metal Organic Frameworks, or MOFs, are crystalline materials with extremely high surface areas. They can be used to store hydrogen and methane for fuel cell cars, or they could be used to sequester the carbon dioxide output of factories and power plants. In this video, Caitlin Stevens gives a tour of the Yaghi lab at UCLA. She explains how MOFs are made and tested.
Просмотров: 5149 CEN Online
Supermembrane Separates Oil and Water with Ease
 
02:00
For more information, go to http://cenm.ag/membrane. Even though oil and water don't mix, when they do come together, as in oil spills, they're difficult to separate. Researchers at the University of Michigan and the Air Force Lab have now developed a membrane that separates the substances with ease, via gravity filtration. In this clip, watch the membrane in action and learn about the materials it's made from.
Просмотров: 7360 CEN Online
Powdered Alcohol: What It Is And How You Make It
 
02:20
C&EN's Jeff Huber and Sophia Cai visited chemistry professor Matt Hartings at American University to learn about--and taste--powdered alcohol. To learn more, go to http://cenm.ag/palco. Like C&EN? Want more chemistry video goodness? Subscribe to our YouTube channel: https://www.youtube.com/user/CENonline Subscribe to C&EN to watch science videos with a focus on chemistry, and to hear from the researchers behind it all. -- Looking for C&EN elsewhere on the internet? Homepage: http://cen.acs.org Facebook: http://www.facebook.com/CENews Twitter: http://www.twitter.com/cenmag Tumblr: http://cenwatchglass.tumblr.com Tumblr: http://cenchempics.tumblr.com
Просмотров: 17342 CEN Online
Artificial Leaf Generates Electricity From Light
 
01:10
This solar-cell device mimics the ability of a leaf to convert sunlight into usable energy. It's the brainchild of a team led by MIT's Daniel G. Nocera, working in conjunction with researchers at SunCatalytix, a company Nocera founded. The device is based on two water-splitting photocatalysts developed by Nocera's group. Simply dropping the solar cell in water and exposing it to light, O2 bubbles begin streaming off the side coated with a cobalt borate catalyst, and H2 bubbles begin streaming off the other side coated by a nickel-molybdenum-zinc alloy catalyst. If placed in a vessel with a barrier, the H2 and O2 could be collected separately and stored, and then later be used to power a fuel cell. Nocera envisions this type of simple, low-cost solar cell, once optimized, could be useful to power individual homes in developing regions around the world. More information here http://cenm.ag/electro
Просмотров: 28374 CEN Online
Are Strawberries Going Away? - Speaking of Chemistry Ep. 24
 
02:49
Strawberries are sweet, juicy, and delightful. Unfortunately, they’re also attractive bait for a litany of pests and diseases. In 2016, an expiring federal pesticide exemption could mean the end of strawberries as we know them. In this Speaking of Chemistry video, Sophia Cai explains the problem and some possible solutions. Subscribe! http://bit.ly/CENOnline If this episode leaves you itching for more, check out the sources below. Speaking of Chemistry is a production of Chemical & Engineering News (C&EN), the weekly magazine of the American Chemical Society. Contact us at speakingofchem@acs.org! Sources: Strawberries In Peril Because Of Fumigant Phaseout Volume 93 Issue 23 | pp. 18-19 Issue Date: June 8, 2015 http://cen.acs.org/articles/93/i23/Strawberries-Peril-Fumigant-Phaseout.html Alternatives to Methyl Bromide: A Florida Perspective APS 2005, DOI: 10.1094/APSnetFeature/2005-0605 http://www.apsnet.org/publications/apsnetfeatures/Pages/MethylAlternatives.aspx A Pest Management Strategic Plan for Strawberry Production in California The California Strawberry Commission (CSC) & The California Minor Crops Council (CMCC) http://www.ipmcenters.org/pmsp/pdf/CASTRAWBERRY.PDF University of California Plant Breeding Center http://plantbreeding.ucdavis.edu/ Tomato Diseases On The Rise In Absence Of Methyl Bromide Posted By: Paul Rusnak, Growing Produce | February 1, 2014 http://www.growingproduce.com/vegetables/tomato-diseases-on-the-rise-in-absence-of-methyl-bromide/ Soil Fumigants Website Chloropicrin Manufacturers' Task Force, Methyl Bromide Industry Panel, and Metam Task Force http://www.fumeinfo.org/
Просмотров: 4007 CEN Online
Hypoallergenic Isn't Really a Thing - Speaking of Chemistry Ep. 16
 
02:53
It’s a simple claim made on thousands of personal care products for adults and kids: hypoallergenic. But what does that actually mean? Turns out, it can mean whatever manufacturers want it to mean, and that can leave you feeling itchy. Speaking of Chemistry is back this week with Sophia Cai explaining why “hypoallergenic” isn’t really a thing. References: Medical Professionals Call For Regulation Of Claims That Cosmetics Are Hypoallergenic http://cen.acs.org/articles/92/i50/Medical-Professional-Call-Regulation-Claims.html Looking for C&EN elsewhere on the internet? Homepage: http://cen.acs.org Facebook: http://www.facebook.com/CENews Twitter: http://www.twitter.com/cenmag
Просмотров: 5517 CEN Online
Turn Up The Alcohol By Volume
 
02:07
Find out how yeast and brewers work together to beef up a beer's alcohol content. To learn more about Avery and Renegade, visit their websites: http://averybrewing.com/age-verification/?referrer=/ http://renegadebrewing.com/ Photo credits Yeast micrograph: J. Cell. Biol. 192: 615-629 http://www.cellimagelibrary.org/images/13901 Mash tun interior: Erik Charlton https://www.flickr.com/photos/erikcharlton/2812431871/in/photolist-5hws1F-4ZJgce
Просмотров: 4787 CEN Online
Is Bleaching Hair Bad For You? - Speaking of Chemistry Ep. 14
 
02:34
Subscribe! http://bit.ly/CENOnline If you’re looking for a new ‘do, you might be considering bleaching your flowing locks. But adding hydrogen peroxide to your head can actually do a lot of damage. C&EN Associate Editor Matt Davenport breaks down why going platinum blonde could be bad for your "head suit." Looking for more information on hair chemistry? Check out these articles. Surface Chemistry Of Becoming A Blonde http://cen.acs.org/articles/92/i38/Surface-Chemistry-Becoming-Blonde.html Color Challenge http://cen.acs.org/articles/86/i6/Color-Challenge.html Hair Care Ingredients Makers Get Creative http://cen.acs.org/articles/91/i19/Hair-Care-Ingredient-Makers-Creative.html L’Oréal Hair Science http://www.hair-science.com/_int/_en/index.aspx Colour To Dye For http://mosaicscience.com/story/hair-dye Melanin micrograph courtesy of Int. J. Trichology: http://openi.nlm.nih.gov/detailedresult.php?img=2938584_IJT-1-83-g002&req=4 Hair lipid schematic adapted from Langmuir: http://pubs.acs.org/doi/abs/10.1021/la500461y?source=cen ----- Subscribe to C&EN to watch science videos with a focus on chemistry, and to hear from the researchers behind it all. Looking for C&EN elsewhere on the internet? Homepage: http://cen.acs.org Facebook: http://www.facebook.com/CENews Twitter: http://www.twitter.com/cenmag
Просмотров: 6775 CEN Online
Improving The Battery In The Tesla Model S Electric Car
 
02:15
Tesla Motors is the only firm making a battery-powered car that runs for 300 miles without needing a recharge. The drawback? Those batteries are expensive. At a Tesla launch event, C&EN Senior Editor Alex Scott takes a test drive and then looks under the hood for a lower cost solution. Like C&EN? Want more chemistry video goodness? Subscribe to our YouTube channel: https://www.youtube.com/user/CENonline Subscribe to C&EN to watch science videos with a focus on chemistry, and to hear from the researchers behind it all. -- Looking for C&EN elsewhere on the internet? Homepage: http://cen.acs.org Facebook: http://www.facebook.com/CENews Twitter: http://www.twitter.com/cenmag Tumblr: http://cenwatchglass.tumblr.com Tumblr: http://cenchempics.tumblr.com
Просмотров: 18848 CEN Online
Insect Chemistry - Speaking of Chemistry Ep. 20
 
02:59
Subscribe! http://bit.ly/CENOnline Insects may not be the most charismatic creatures on the planet, but what they lack in cuddliness, they make up for with chemical ingenuity. In Episode 20 of Speaking of Chemistry, Matt Davenport looks at three of the craziest six-legged chemists out there. If this episode leaves you wanting more, check out the sources below. Speaking of Chemistry is a production of Chemical & Engineering News (C&EN), the weekly magazine of the American Chemical Society. Contact us at speakingofchem@acs.org! For more of C&EN’s critter chemistry videos, visit https://www.youtube.com/playlist?list=PLM2CTqSTy7cRaqZg4_UJ7fXXIFyPaZipQ Sources: Beetle’s Explosive Spray Mechanism Revealed By X-Ray Imaging Volume 93 Issue 18 | p. 7 Issue Date: May 4, 2015 http://cen.acs.org/articles/93/i18/Beetles-Explosive-Spray-Mechanism-Revealed.html. To Outwit Plant Defenses, Hungry Caterpillars Turn Chemists Volume 92 Issue 40 | p. 10 Issue Date: October 6, 2014 http://cen.acs.org/articles/92/i40/Outwit-Plant-Defenses-Hungry-Caterpillars.html An Ant’s Acid Antidote Volume 92 Issue 9 | pp. 44-45 Issue Date: March 3, 2014 http://cen.acs.org/articles/92/i9/Ants-Acid-Antidote.html Ant Battle Yields Ionic Liquid Volume 92 Issue 30 | p. 32 Issue Date: July 28, 2014 http://cen.acs.org/articles/92/i30/Ant-Battle-Yields-Ionic-Liquid.html For more critter chemistry stories, visit: http://cen.acs.org/collections/critchem.html Beetle footage courtesy of Melanie Gonick/MIT: https://www.youtube.com/watch?v=TgqF-ND2XcY Ant footage from Edward G. LeBrun, Nathan T. Jones, Lawrence E. Gilbert, Science 2014, DOI: 10.1126/science.1245833 http://www.sciencemag.org/content/343/6174/1014/suppl/DC1 If you’re wondering where that 10 quintillion insect estimate came from, visit the Entomological Society of America: http://www.entsoc.org/resources/faq Lastly, Prince did not name the Rasberry crazy ants. They’re named for Tom Rasberry, the exterminator who identified the invasive pests and the threat they pose. Check out this video to learn more about Tom and the crazy ants: https://www.youtube.com/watch?v=NgpCXGsC6PU Craving even more juicy bug coverage? Here are the scientific publications behind C&EN’s original stories. Bombardier Beetle Spray: Eric M. Arndt, Wendy Moore, Wah-Keat Lee, Christine Ortiz, Science 2015, DOI: 10.1126/science.1261166 http://www.sciencemag.org/content/348/6234/563 Fall Armyworm Stereochemistry: Felipe C.Wouters et al., Angew. Chem. Int. Ed. 2014 DOI: 10.1002/anie.201406643 http://onlinelibrary.wiley.com/doi/10.1002/anie.201406643/abstract Tawny Crazy Ant-idote: Edward G. LeBrun, Nathan T. Jones, Lawrence E. Gilbert, Science 2014, DOI: 10.1126/science.1245833 http://www.sciencemag.org/content/343/6174/1014/suppl/DC1 Li Chen et al., Angew. Chem. Int. Ed. 2014, DOI: 10.1002/anie.201404402 http://onlinelibrary.wiley.com/doi/10.1002/anie.201404402/abstract
Просмотров: 12910 CEN Online
DNA Hydrogel Collapses, Then Remembers Original Shape
 
01:58
To learn more about this material, go to http://cenm.ag/hydrogels. Nature can do a lot of spectacular things. But some researchers are designing materials that go beyond what Mother Earth is capable of. These substances are called metamaterials. Now, scientists from Cornell University have designed a new metamaterial called a DNA hydrogel that can collapse into a puddlelike state but then retake its original shape when submerged in water. Like the robot assassin T-1000 in "Terminator 2," the researchers think their new gel might one day flow through a narrow opening and take shape again on the other side. In the meantime, however, they're eyeing the material for use in drug delivery and electrical circuits.
Просмотров: 7924 CEN Online
Scientific Cocktail Toppers Move from the 3D Printer to the Bar
 
02:45
Last fall, MIT researchers debuted two scientific cocktail toppers - a cocktail boat and floral pipette - that they developed in collaboration with celebrity chef José Andrés. To find out how close these two garnishes are to a bar or restaurant near you, C&EN went inside Andrés's headquarters, ThinkFoodGroup. The garnishes both rely on a special property of liquids, surface tension, to work. The edible prototypes in this video are made with silicone molds fashioned with help from a 3D printer. The garnishes are not available to the public yet, but stay tuned. For more details, see http://cenm.ag/wow and the paper "Biomimicry and the Culinary Arts" by Burton, et al. 2013 at: http://iopscience.iop.org/1748-3190/8/4/044003/article
Просмотров: 18977 CEN Online
R. B. Woodward, chemistry legend
 
05:57
On what would be Robert Burns Woodward's 100th birthday, C&EN looks back at his legacy using footage of the man himself. To read more, visit http://cenm.ag/woodward100. Watch the original video clips here: http://bit.ly/RBWoodward Speical thanks to the Hoye Group & Addison Ault for conserving and sharing this footage.
Просмотров: 6352 CEN Online
The Surprising Chemistry of Mummies, Ghosts, and Vampires - Spooking of Chemistry
 
03:39
Happy Halloween! It’s time to collect some serious sweets and impress your friends with an awesome costume. In this week’s spooky Speaking of Chemistry, Judy fills you in on the surprising science behind ghosts, vampires, and mummies. That’s a wrap! If this episode leaves you craving more creepy chemistry, check out the featured resources below: Speaking of Chemistry is a production of Chemical & Engineering News (C&EN), the weekly magazine of the American Chemical Society. Contact us at speakingofchem@acs.org! Subscribe to C&EN’s YouTube channel! https://www.youtube.com/user/cenonline Resources: Bodily Bookbinding, Chemistry For Mummies http://cen.acs.org/articles/93/i42/Bodily-Bookbinding-Chemistry-Mummies.html Mummy Preservation, When Frankenstein Came To Life http://cen.acs.org/articles/89/i44/Mummy-Preservation-Frankenstein-Came-Life.html Halloween Treats http://cen.acs.org/articles/87/i43/Halloween-Treats-Support-Favorite-Element.html Carving Nanopumpkins http://cen.acs.org/articles/90/i43/Carving-Nanopumpkins-Slicing-Fingers-Cutting.html More On The Mütter's Soap Lady: http://muttermuseum.org/exhibitions/the-soap-lady/
Просмотров: 3019 CEN Online
19th century medicine & voodoo -- A Tour of the New Orleans Pharmacy Museum
 
03:08
C&EN invites viewers on a virtual tour of the New Orleans Pharmacy Museum, located in the heart of the French Quarter. This 19th century apothecary shop is filled from floor to ceiling with bottles and jars containing crude drugs, herbal medicines, and voodoo potions. Tour guide Matthew Chandelier explains a few of the things chemists will find in this treasure chest of ancient medicine.
Просмотров: 6635 CEN Online
Why Don't We Recycle Styrofoam? - Speaking of Chemistry
 
03:12
It’s common practice to recycle paper, glass, and many plastics—in fact, about 35% of the trash produced in the U.S. is recycled or composted. So why can’t we recycle what’s commonly referred to as Styrofoam? (It’s actually expanded polystyrene, or EPS—a bit different!) In episode 19 of Speaking of Chemistry, host Sophia Cai explains that EPS actually can be recycled, but the prohibitive costs have prompted cities to ban the pesky product instead. If this episode leaves you wanting to know more about recycling EPS, read the sources below. Speaking of Chemistry is a production of Chemical & Engineering News (C&EN), the weekly magazine of the American Chemical Society. Contact us at speakingofchem@acs.org! Subscribe to C&EN’s YouTube channel! Fuming Over Foam http://cen.acs.org/articles/93/i12/Fuming-Over-Foam.html Volume 93 Issue 12 | pp. 23-25 Issue Date: March 23, 2015 New York City Bans Expanded Polystyrene Food Containers, Opens Market To Alternatives http://cen.acs.org/articles/93/web/2015/01/New-York-City-Bans-Expanded.html C&EN Latest News Web Date: January 12, 2015
Просмотров: 19600 CEN Online
Keeping Cool without Killing the Planet - Speaking of Chemistry Ep. 21
 
03:20
Subscribe! http://bit.ly/CENOnline Refrigeration is a staple of modern living—we use refrigerants in air conditioners, aerosol spray cans, and, well, refrigerators. But it turns out that the most popular refrigerants of the 20th century depleted the ozone and had high global warming potentials. In episode 21 of Speaking of Chemistry, Sophia Cai takes a look at the pros and cons of new refrigerants recently approved by the Environmental Protection Agency to be used as more environmentally friendly alternatives. If this episode leaves you wanting more, check out the links below.. Speaking of Chemistry is a production of Chemical & Engineering News (C&EN), the weekly magazine of the American Chemical Society. Contact us at speakingofchem@acs.org! The Montreal Protocol Is Healing Earth’s Ozone Hole http://cen.acs.org/articles/93/i22/Montreal-Protocol-Healing-Earths-Ozone.html Volume 93 Issue 22 | p. 8 Issue Date: June 1, 2015 Climate-Friendly Refrigerants http://cen.acs.org/articles/93/i10/Climate-Friendly-Refrigerants.html Volume 93 Issue 10 | p. 6 Issue Date: March 9, 2015 EPA Clamps Down On Anhydrous Ammonia For Refrigeration http://cen.acs.org/articles/93/i9/EPA-Clamps-Down-Anhydrous-Ammonia.html Volume 93 Issue 9 | p. 26 Issue Date: March 2, 2015 Halocarbons Reassessed http://cen.acs.org/articles/91/i34/Halocarbons-Reassessed.html Volume 91 Issue 34 | pp. 27-28 Issue Date: August 26, 2013
Просмотров: 3424 CEN Online
Making a safer lithium-ion battery
 
03:18
Researchers at the University of Maryland and the Army Research Lab are building lithium-ion batteries that won’t explode when damaged. ↓↓More info and references below↓↓ The lithium-ion batteries in our electronic devices use organic electrolytes to store charge. The problem is that these electrolytes are flammable. Li-ion batteries that replace those electrolytes with water-based versions remove the risk of explosions but don’t perform as well. In this video University of Maryland postdoc Chongyin Yang demonstrates how his team uses an anode with a special coating to make aqueous batteries that can reach 4.0 V—the voltage level of today’s commercial Li-ion batteries. Charged up about batteries? Check out these great resources: Periodic graphics: Why Li-ion batteries catch fire | C&EN https://cen.acs.org/articles/94/i45/Periodic-graphics-Li-ion-batteries.html Flexible batteries get safe aqueous electrolytes | C&EN https://cen.acs.org/articles/95/web/2017/08/Flexible-batteries-safe-aqueous-electrolytes.html “Water-in-salt” electrolyte enables high-voltage aqueous lithium-ion chemistries | Science http://science.sciencemag.org/content/350/6263/938/F5 Aqueous Li-Ion Batteries | Joule http://www.cell.com/joule/abstract/S2542-4351(17)30034-X
Просмотров: 2969 CEN Online
How The World's First Lithium Ion Microscope Works
 
02:21
Watch this guided tour of a new type of focused ion beam built for nanoscale imaging and machining. Learn more at http://cenm.ag/liscope Jabez McClelland and his team developed the instrument at the Center for Nanoscale Science & Technology at NIST. You can read more about it in their paper in the journal, Ultramicroscopy: http://www.sciencedirect.com/science/article/pii/S0304399114000679 Want to learn more about how Brookhaven National Lab created that 3-D image of a battery anode? Check out this paper from Jun Wang's group in Angewandte Chemie: http://onlinelibrary.wiley.com/doi/10.1002/anie.201310402/abstract
Просмотров: 2303 CEN Online
Fugitive Ink Flees the Scene to Help Sustain 3-D Printed Tissue
 
02:26
Jennifer Lewis and her team at Harvard University and the Wyss Institute have developed a new technique to help create blood vessels and living tissue with 3-D printing. For more of the story on 3-D bioprinting, visit http://cenm.ag/3dbio 3-D printing footage copyright Wiley-VCH Verlag GmbH & Co. KGaA. Reproduced with permission.
Просмотров: 6212 CEN Online
How MOFs are Made and Tested
 
01:31
Metal organic frameworks can double the capacity of hydrogen fuel tanks and capture carbon emissions from factories. A graduate student in the lab of Omar Yaghi explains how they are made.
Просмотров: 3808 CEN Online
How do some animals glow? — Speaking of Chemistry
 
04:05
What’s the difference between fluorescence and bioluminescence? We illuminate the biochemical distinctions. ↓↓More info and references below↓↓ Special thanks to everyone who shared their amazing glowing animal footage with us. Be sure to check out Jelly Club’s YouTube page for more stunning jelly videos: https://www.youtube.com/user/JellyClubAdmin To learn more about Marc Zimmer’s research at Connecticut College and to find more great info and images involving GFP, visit his website: http://www.conncoll.edu/ccacad/zimmer/MZ-8/ To see more luminescent creatures photographed by NOAA, visit their Ocean Explorer webpage: http://oceanexplorer.noaa.gov/explorations/09bioluminescence/welcome.html And don’t forget to watch the Wellcome Trust’s video to learn all about those wild blue nematode worms: https://www.youtube.com/watch?v=pAw5rjgHWc0 Even more brilliant references: First naturally-fluorescing frog found in Argentina | C&EN http://cen.acs.org/articles/95/i12/First-naturally-fluorescing-frog-found.html Glowing mushroom’s mechanism unmasked | C&EN http://cen.acs.org/articles/95/i18/Glowing-mushroomsmechanism-unmasked.html Novel roles for GFP | C&EN http://cen.acs.org/articles/87/i18/Novel-Roles-GFP.html Spider Seduction Requires UV Light | C&EN http://cen.acs.org/articles/85/i5/Spider-Seduction-Requires-UV-Light.html Naturally occurring fluorescence in frogs | Proc. Natl. Acad. Sci. USA http://www.pnas.org/content/114/14/3672 Mechanism and color modulation of fungal bioluminescence | Sci. Adv. http://advances.sciencemag.org/content/3/4/e1602847 Live cell imaging of PC3 prostate cancer cells | Figshare https://figshare.com/articles/PC3_GFPEN2_sample2_cell_fusion_mp4/4057197 Speaking of Chemistry is a production of Chemical & Engineering News (C&EN), the weekly news magazine of the American Chemical Society. Connect with us at www.facebook.com/SpeakingOfChem and/or at speakingofchem@acs.org!
Просмотров: 3397 CEN Online
Learning About Alchemy With Larry Principe
 
03:28
Revolutionary: Lawrence Principe, professor of organic chemistry and the history of science at Johns Hopkins University, studies late-medieval and early-modern alchemy to answer questions about how modern-day chemistry developed. Filmed and edited by Kirk Zamieroski for C&EN
Просмотров: 8091 CEN Online
Beer Brewing Chemistry - Speaking of Chemistry Ep. 17
 
02:21
Every beer brewer is locked into a high-maintenance relationship with yeast: those finicky, alcohol-creating microorganisms. In Episode 17 of Speaking of Chemistry, brewmaster Max Filter from Renegade Brewing Company fills us in on how he keeps his fermenting fungi happy. If this episode leaves you wanting more, read the sources below. Speaking of Chemistry is a production of Chemical & Engineering News (C&EN), the weekly magazine of the American Chemical Society. Contact us at speakingofchem@acs.org! Subscribe to C&EN’s YouTube channel! Tapping Yeast’s Genome http://cenm.ag/brewing Volume 93 Issue 16 | pp. 8-13 Issue Date: April 20, 2015 Strange Brews: The Genes of Craft Beers http://www.nytimes.com/2014/05/27/science/craft-beer-at-the-genetic-level.html?_r=0 New York Times Web Date: May 26, 2014 What’s That Stuff: Beer http://cen.acs.org/articles/84/i14/Beer.html Volume 84 Issue 14 | p. 39 Issue Date: April 3, 2006
Просмотров: 4014 CEN Online
Growing Induced Pluripotent Stem Cells
 
01:48
Sravanti Kusuma, a graduate student in Bioengineering at Johns Hopkins University, shows some induced pluripotent stem cells and talks about handling them. Kusuma works for Professor Sharon Gerecht, Chemical and Biomolecular Engineering, Whiting School of Engineering, and affiliated with Johns Hopkins Institute for NanoBioTechnology. The Gerecht lab studies stem cells with the long-term goal of making blood vessels from stem cells, potentially for nourishing transplanted organs. Filmed and edited by Kirk Zamieroski
Просмотров: 5800 CEN Online
Organic LEDs and Artificial Muscles
 
01:33
In the Materials Science department at UCLA, Qibing Pei and his lab make a wide variety of stretchable electronic devices.
Просмотров: 3385 CEN Online
What Is Tinsel Made Of? Speaking of Chemistry Ep. 12
 
02:42
How is the shiny tinsel that decorates many Christmas trees made? Today it's mostly made of plastic. But did you know tinsel used to contain chemical elements like lead, aluminum, or copper? Find out all about tinsel's chemistry history in this very special holiday episode of Speaking of Chemistry. Special thanks to the following for photos: Materialscientist/Wikimedia commons http://en.wikipedia.org/wiki/Aluminium#mediaviewer/File:Aluminium-4.jpg http://en.wikipedia.org/wiki/Copper#mediaviewer/File:NatCopper.jpg AlchemistHP/Wikimedia commons http://en.wikipedia.org/wiki/Lead#mediaviewer/File:Lead_electrolytic_and_1cm3_cube.jpg Brite Star Manufacturing Co. (tinsel product photos) Darron Fick/Flickr https://www.flickr.com/photos/thunderpants/173076522/ Jüppsche/Wikimedia commons http://commons.wikimedia.org/wiki/File:Lametta_-_Christmas_decorations.jpg Rene Schwietzke/Flickr https://www.flickr.com/photos/rene-germany/2126809489/ simpleinsomnia/Flickr https://www.flickr.com/photos/simpleinsomnia/9698410745 https://www.flickr.com/photos/simpleinsomnia/15240693388 snapshotsofthepast/Flickr https://www.flickr.com/photos/oldeyankee/8128048724 https://www.flickr.com/photos/oldeyankee/8128022305/ Carmen Drahl Susan Waggoner Like C&EN? Want more chemistry video goodness? Subscribe to our YouTube channel: https://www.youtube.com/user/CENonline Subscribe to C&EN to watch science videos with a focus on chemistry, and to hear from the researchers behind it all. -- Looking for C&EN elsewhere on the internet? Homepage: http://cen.acs.org Facebook: http://www.facebook.com/CENews Twitter: http://www.twitter.com/cenmag
Просмотров: 7265 CEN Online
How can quantum computers change chemistry? — Speaking of Chemistry
 
08:49
A growing band of scientists and tech giants are turning to quantum computers to solve some of chemistry’s currently intractable problems. ↓↓More info and references below↓↓ In this episode of Speaking of Chemistry, we look at how chemists and physicists want to use quantum computers, a new kind of machine that they hope can simulate and even predict molecules valuable for catalysis, materials science, and drug discovery. Read more: Chemistry is quantum computing’s killer app | C&EN https://cen.acs.org/articles/95/i43/Chemistry-quantum-computings-killer-app.html Quantum computing goes beyond hydrogen and helium | C&EN https://cen.acs.org/articles/95/i37/Quantum-computing-goes-beyond-hydrogen-and-helium.html Digitalization comes to the materials industry | C&EN https://cen.acs.org/articles/95/i39/Digitalization-comes-materials-industry.html Hardware-efficient variational quantum eigensolver for small molecules and quantum magnets | Nature https://www.nature.com/articles/nature23879 Speaking of Chemistry is a production of Chemical & Engineering News (C&EN), the weekly news magazine of the American Chemical Society. Contact us at cen_multimedia@acs.org!
Просмотров: 1552 CEN Online
All About Antibiotics - Speaking of Chemistry Ep. 8
 
02:44
Subscribe to C&EN’s YouTube channel! http://bit.ly/CENOnline Antibiotics revolutionized health care in the early 20th century, helping kill bacteria that once killed thousands of people. But bacteria are also constantly outsmarting science, and new strains of antibiotic-resistant bacteria are popping up more frequently. This episode answers the question: Why should you finish your pills if you feel better? Antibiotics are just one kind of medicine that chemistry makes possible. Want to learn about cutting-edge drug discovery? Attend a FREE conference — online — from C&EN. Watch live on September 24, or see archived talks during all of 2014. Sign up at http://cenm.ag/symposium Contact us at speakingofchem@acs.org!
Просмотров: 2965 CEN Online
Students Love Chemistry at Int  Chem  Olympiad
 
03:12
For more information, go to http://cenm.ag/icho2. In this clip, high school students from all over the world, who are participating in this year's International Chemistry Olympiad (IChO), explain why they love the central science. Answers range from "Because it's as much an art as it is a science," to "Because I'm good at it." This year's IChO is being held in the U.S., at the University of Maryland, College Park, from July 21-30.
Просмотров: 4522 CEN Online
Ellipsometry for Studying Polymers
 
01:51
Zahra Fakhraai is a polymer researcher in the Penn chemistry department.
Просмотров: 4113 CEN Online