Abstract: There is provided a polydiacetylene supramolecule comprising diacetylene molecules, capable of immobilizing a receptor molecule having a thiol group. Since the polydiacetylene supramolecule has a receptor immobilized thereon having a thiol group, for example, an antibody, and thus shows color transition when reacting with a sample, an antigen can be detected through specific color transition of the polydiacetylene when employing in a receptor-ligand reaction, for example, an antibody-antigen reaction.

Abstract: There is provided a method of separating free-astaxanthin selectively from green algae and, more particularly, to a method of separating free-astaxanthin selectively from Haematococcus pluvialis, the method comprising: mixing a cell culture containing Haematococcus pluvialis with an alkanic solvent and stirring, thereby obtaining an alkanic solvent extract containing astaxanthin material including free-astaxanthin and astaxanthin ester (step 1); and mixing the alkanic solvent extract with an alcohol and stirring, thereby obtaining an alcoholic extract containing free-astaxanthin (step 2). The present invention can not only maximize the efficiency of separating astaxanthin in high concentration by providing a very simple process technique capable of recovering free-astaxanthin selectively from H.

Abstract: There is provided a method of detecting a pathogenic microorganism in real-time, using a modified flow-type surface plasmon resonance (SPR) biosensor, comprising the steps of: i) performing, in a batch-type, an immune reaction of a pathogenic microorganism and an antibody thereto; ii) selectively separating the pathogenic microorganism bound with the antibody; and iii) binding the pathogenic microorganism bound with the antibody on a surface of a chip of a flow-type SPR sensor system in real-time.

Abstract: The present invention provides a process of preparing barium titanate powders having fine particle morphology and superior crystallinity, by preparing a sol precursor by using a titanium acylate and a barium compound, spraying the sol precursor in a strong alkaline solution for coprecipitation, crystallizing the barium titanate with an optional hydrothermal reaction, and purifying the barium titanate powder by washing.

Abstract: A method has been developed for control of molecular weight and molecular weight dispersity during production of polyhydroxyalkanoates in genetically engineered organism by control of the level and time of expression of one or more PHA synthases in the organisms. The method was demonstrated by constructing a synthetic operon for PHA production in E. coli in which the level of PHA synthase activity could be tightly controlled by placement of the synthase behind an inducible promoter. Modulation of the total level of PHA synthase activity in the host cell by varying the concentration of the inducer, isopropyl .beta.-D-thiogalactoside (IPTG), was found to effect the molecular weight of the polymer produced in the cell. Specifically, high concentrations of synthase activity were found to yield polymers of low molecular weight while low concentrations of synthase activity yielded polymers of higher molecular weight.