Navigation Links
An exquisite container
Date:11/1/2009

e cup is lit from inside, however, the green light is absorbed, and we see the remaining light, which is predominantly red, the complementary color to green.

It's actually the absorption component that the scientists exploit to open and close the nanocages. When the light is absorbed it is converted to heat, and the nanocages are covered with a special polymer that responds to heat in an interesting way.

The polymer, poly(N-isopropylacrylamide), and its derivatives has what's called a critical temperature. When it reaches this temperature it undergoes a transformation called a phase change.

If the temperature is lower than the critical temperature, the polymer chains are water-loving and stand out from the cage like brushes. The brushes seal the cage's pores and prevent its cargo from leaking out. If the temperature is above the critical temperature, on the other hand, the polymer chains shun water, shrink together and collapse. As they shrink, the pores of the cage open, and its contents flood out.

"It's a bit counter-intuitive," says Xia. "Typically when you go to higher temperature, a molecule will expand, but this one does the opposite."

Like everything else about this system, the polymer is tunable. The scientists can control its critical temperature by altering its composition. For medical applications, they tune the critical temperature to one right above body temperature (37 degrees Celsius) but well below 42 degrees Celsius (107 degree Fahrenheit), the temperature at which heat would begin to kill cells.

Next comes the fun part. Once they had made their smart capsules, the scientists tested them by loading them with a bright red dye called alazarin crimson, or rose madder. The dye made it easy to detect and measure any release with a spectrometer.

The cages were loaded by shaking them in a solution of the dye at a temperature above the critical temperature of the smart polymer. Next, they we
'/>"/>

Contact: Diana Lutz
dlutz@wustl.edu
314-935-5272
Washington University in St. Louis
Source:Eurekalert  

Page: 1 2 3 4 5

Related biology technology :

1. Bedford Laboratories(TM) to Begin Shipping Fluconazole Injection in PVC Flexible Containers
2. Thermo Fisher Scientific to Expand Manufacturing Operation for Single-Use Bioprocessing Containers
3. International Isotopes Inc. Announces Completion of an Exclusive Distributor Agreement for Sales of New Style Transportation Containers
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
An exquisite container
(Date:11/26/2014)... 2014 The report on the Global ... the concerned market for revenue forecasts and market trends. ... of 51.9% from 2013 to 2018. At the projected ... of $1,415.6 million by 2018. , Browse through the ... for information about the market segmentation and in-depth analysis ...
(Date:11/26/2014)... 2014 In keeping with the holiday ... bevy of last-minute Thanksgiving savings. The company is offering ... all product lines this holiday weekend as well as ... Friday, and Cyber Monday are right around the corner, ... both loyal customers and those looking to explore their ...
(Date:11/26/2014)... , Nov. 26, 2014 The ... results from a survey of European physicians at ... on Innovation and Biological Therapies" at the Spanish ... event, hosted by EuropaBio and the Spanish Bioindustry ... of Health, physicians from Spanish oncology and rheumatology ...
(Date:11/26/2014)... PMG Research, Inc. announced today ... a network of sites that provide clinical research services to ... patient lives through its partnerships with large physician practices and ... site locations in the Southeastern United States and spans over ... board will be held by: Dr. Robert Holmes, ...
Breaking Biology Technology:Global Smart Sensor Market in Building Automation is expected to reach a value of $1,415.6 million by 2018 - Report by MicroMarket Monitor 2Global Smart Sensor Market in Building Automation is expected to reach a value of $1,415.6 million by 2018 - Report by MicroMarket Monitor 3Global Smart Sensor Market in Building Automation is expected to reach a value of $1,415.6 million by 2018 - Report by MicroMarket Monitor 4DNA Spectrum Offers Last Minute Thanksgiving Coupons 2DNA Spectrum Offers Last Minute Thanksgiving Coupons 3ASBM Presents European Physicians Survey at Spanish Ministry of Health 2PMG Research Names Medical Advisory Board 2PMG Research Names Medical Advisory Board 3
... Mass., Dec. 21 LeMaitre Vascular,Inc. (Nasdaq: ... and,implants, yesterday acquired Biomateriali S.r.l., a privately held ... cash, the assumption,of euro 0.8 million in intercompany ... 1.5 million. The acquisition was structured as a ...
... Dec. 20 MacAndrews & Forbes Holdings Inc.,announced ... President for Life,Sciences, who also serves as Chief ... to the National Biodefense Science Board (NBSB). The,NBSB ... Secretary Mike Leavitt,on scientific, technical and other matters ...
... the Record and Provide Accurate Information to ... ... VaxGen,Inc. (Pink Sheets: VXGN), (Logo: http://www.newscom.com/cgi-bin/prnh/19991112/VAXGENLOGO ), ... announced on,November 12, 2007 that their respective Boards of Directors had ...
Cached Biology Technology:LeMaitre Vascular Acquires Biomateriali, a Vascular Graft Manufacturer 2LeMaitre Vascular Acquires Biomateriali, a Vascular Graft Manufacturer 3Department of Health & Human Services Names Dr. Eric Rose to National Biodefense Science Board 2VaxGen Addresses MPM Claims in Letter to Stockholders 2VaxGen Addresses MPM Claims in Letter to Stockholders 3VaxGen Addresses MPM Claims in Letter to Stockholders 4VaxGen Addresses MPM Claims in Letter to Stockholders 5VaxGen Addresses MPM Claims in Letter to Stockholders 6VaxGen Addresses MPM Claims in Letter to Stockholders 7VaxGen Addresses MPM Claims in Letter to Stockholders 8VaxGen Addresses MPM Claims in Letter to Stockholders 9
(Date:11/6/2014)... metastasis, yet progress in preventing and treating migratory ... particularly challenging to design drugs that work against ... biology at Harvard Medical School. , "Unfortunately, ... metastasized." , Gujral and colleagues have now identified ... understand how metastasis begins. Their findings may also ...
(Date:11/6/2014)... Insilico Medicine, Inc, a Baltimore-based bioinformatics company focused ... announced a research collaboration with the international leader ... (OTC: CSBR). , "There are many companies utilizing ... Oncology,s TumorGraft technology is unique in a way ... generating vast amounts of valuable data. Our bioinformatic ...
(Date:11/5/2014)... – Kelly Redmond has dedicated his career to ... to a general audience. , As deputy director ... Center at Nevada,s Desert Research Institute, Redmond has ... management, application and dissemination of climate data to ... Fall Meeting in San Francisco on December 15-19, ...
Breaking Biology News(10 mins):Migration negation 2Migration negation 3Insilico Medicine, Inc announces research collaboration with Champions Oncology, Inc 2Nevada climatologist to be honored at AGU Fall Meeting for lifetime of public outreach 2
... the world from dying off, deep cuts in carbon ... Carnegie,s Katharine Ricke and Ken Caldeira. They find that ... ocean chemistry conditions by the end of the century ... work will be published July 3 by Environmental ...
... A single systemic dose of special immune cells prevented ... model of kidney transplantation, according to experts at the ... available in the online version of the American ... eventual human trials of the technique. , Organ transplantation ...
... 4000 elk of the Clarks Fork herd leave crowded ... into the highlands of the Absaroka Mountains, where they ... snowmelt. It,s a short trip (40-60 kilometers) by migratory ... fences, metropolitan areas, and other human-built barriers. But it ...
Cached Biology News:Major changes needed for coral reef survival 2Dendritic cell therapy improves kidney transplant survival, Pitt team says 2Declining fortunes of Yellowstone's migratory elk 2Declining fortunes of Yellowstone's migratory elk 3Declining fortunes of Yellowstone's migratory elk 4
... paper sandwiches are composed of a precut ... thick filter paper that are preassembled into ... These 7 x 8.5 cm membrane sandwiches ... Gel-sized gels and are supplied as a ...
... This kit is designed to knockout or alter ... less than one week. Red/ET recombination allows the ... precise, specific, and faithful manner. An FRT-flanked kanamycin ... which can be used to replace a gene ...
Recommended for use as a cell culture substratum at 0.1-0.2 mg/cm 2 or 5-10 μl/cm 2 . Optimal concentration depends on cell type as well as the application or research objectives. Type B...
... LIGHT. Useful in cell activation experiments when calcium dose-response ... Soluble in DMSO or EtOH. For use ... in DMSO is recommended. Microliter amounts of this solution ... mixing (e.g. 10 μl into 5 ml of H ...
Biology Products: