In the April1 issue of G&D, a Korean research team led by Dr. Kyong-Tai Kim (POSTECH) describes how melatonin production is coordinated with the body‘s natural sleep/wake cycles.Melatonin is a hormone produced by the pineal gland in the brain, which helps to regulate our bodies’ circadian rhythm (the roughly-24-hour cycle around which basic physiological processes proceed). Normally, melatonin production is inhibited by light and enhanced by darkness, usually peaking in the middle of the night. Melatonin‘s expression pattern is mimicked by a protein called AANAT, which is..
Practical recombinant hybrid mussel bioadhesiveWhat man-made good exists that provides us both life’s necessity and luxury? A popular seafood cuisine, mussels are enjoyed all around the world. They can be smoked, boiled, or steamed to be served alone or as an ingredient of a larger dish. It can also produce beautiful pearls and jewelry. Now scientists have discovered another use for this nature’s gift. Professor Hyung Joon Cha and his team at the Department of Chemical Engineering have developed a novel type of practical recombinant hybrid bioadhesive material that originates from ..
According to laws of quantum mechanics a physical entity may possess either particle-like or wave-like properties. A particle exhibits wave properties when one cannot tell the path the particle may take among different paths available. Once the path information is obtained, however, the wave-like properties of a particle are supposed to disappear. In any case, it is not possible to observe both the wave and particle properties simultaneously, which is known as complementarity of a physical entity. In early days around the advent of quantum mechanics the concept of complementarity was considere..
Ultrahigh density arrays of conducting polymer nanorods have been fabricated through a joint research project by Professors Jin Kon Kim and Su-Moon Park of Pohang University of Science and Technology (POSTECH), Dr. Jae-Woong Yu of Korea Institute of Science and Technology (KIST), and Professor Thomas P. Russell of the University of Massachusetts at Amherst, U.S.A., as reported in Nano Letters, vol. 8, 2315-2320 (2008). Nanoporous templates, for instance, track-etched polymer membrane and anodized aluminum oxide (AAO) membrane, have been widely used to prepare conducting polymer nanotubes, nano..
Ultra-fast flash light revealing mystery of atoms, into the world of attoseconds (10-18 second) Beyond the femtosecond (10-15 second) barrierFerroelectric RAM (FeRAM) is a type of non-volatile computer memory, similar to dynamic random access memory (DRAM) which can be found in majority of our computers. FeRAM uses a ferroelectric layer to achieve non-volatility and offers a number of advantages from lower power usage to faster writing speeds.Ferroelectrics such as PbTiO3 have usually two stable oppositely-polarized states without external electric fields, and the negatively-polarized state ca..
Nobel Laureate conferred first POSTECH Honorary DoctorateDr. Roderick MacKinnonPOSTECH, in celebrating 20th Anniversary on December, awarded the first honorary doctorate to Dr. Roderick MacKinnon of the Rockefeller University. Dr. MacKinnon received a Nobel Prize in Chemistry in 2003 for his work on the structure and operation of ion channels. He is currently the head of Laboratory of Molecular Neurobiology and Biophysics which studies the structure and function of ion channels and associated regulatory proteins. International Affairs Office (IAO): First, congratulations on your honorary docto..
Improvements in performance and reductions in cost of silicon-based nonvolatile memories, such as flash random access memory (flash-RAM), have rendered floppy discs and many other forms of portable storage obsolete. But for many uses that require data to be written only once, such as archiving and security applications, their cost effectiveness is limited. So-called write-onceread- many (WORM) memories made from low-cost polymer materials could provide a solution. The devices, developed by Professors Moonhor Ree, Ohyun Kim, Su-Moon Park and their research teams, are based on hyperbranched copp..
Direct printing of functional electronic materials may provide a promising route to low-cost fabrication of integrated circuits. From this point of view, ink-jet printing has received special attention as a direct patterning technique for the cost-effective fabrication of organic electronic devices such as organic thin-film transistors (OTFTs) (Figure 1) and organic photovoltaic cells. Professor Kilwon Cho and Ms. Jung Ah Lim of the Department of Chemical Engineering have succeeded in fabricating high-performance OTFTs by inkjet printing of organic semiconductor. This result entitled “Se..
Ultra-fast flash light revealing mystery of atoms, into the world of attoseconds (10-18 second)Beyond the femtosecond (10-15 second) barrierAs momentary flash lights capture the motion of fast moving objects such as a bullet or explosion splinter, ultra-fast laser lights can be utilized to take pictures of ultra-fast natural phenomena following their dynamical change. The last decade has observed a rapid progress in femtosecond laser technology. This development allows us to carry out new kinds of experiments to open up a new area of nature that has never been explored before. Is there no phen..
30-nano class Gallium Arsenide (GaAs) nano-transistor: comparative advantages in its performanceEasy manufacturing process: less than half the cost of commercializationIt is possible to receive and enjoy various multimedia contents such as music, movies, and other data, at speeds of several tens of Mbps using high-speed internet widely available in households. Studies on the improvement of communication speeds have been continuously conducted over the recent years.Professor Yoon-Ha Jeong and research team have successfully succeeded in developing 35-nano GaAs nano-transistors (metamorphic HEMT..