Abstract:
PURPOSE: A method for extracting and isolating a physiological material from Centella asiatica is provided to promote wound healing, cell proliferation, and collagen synthesis. CONSTITUTION: A method for extracting and isolating asiatic acid and asiaticoside comprises: a step of injecting Centella asiatica in a reactor to contact with water; a step of increasing temperature and pressure of water to make to subcritical water; a step of contacting the Centella asiatica and subcritical water to prepare Centella asiatica extract; a step of lowering the temperature and pressure of the subcritical water to collect the Centella asiatica extract; and a step of filtering the Centella asiatica extract to obtain asiatic acid and asiaticoside.
Abstract:
본 발명은 종자식물에서 유식물체 (seedling)의 하배축 (hypocotyl) 상부로부터 부정아 (adventitious shoot)를 고빈도로 유도하는 방법 및 이로부터 재분화 식물체와 형질전환된 재분화 식물체를 제조하는 방법에 관한 것으로, 본 발명은 종자를 무균 발아하여 얻은 유식물체의 하배축 윗부분 (upper hypocotyl)의 일부분을 남기고 절단한 후, 그 절단면을 배지에 접하도록 배양하여 부정아를 고빈도로 유도하고, 이렇게 유도된 부정아를 이용하여 재분화 식물체를 제조하는 한편 유용 유전자를 하배축 절단면에 도입한 후 그 곳에서 부정아를 유도하여 정상적으로 생장하는 형질전환된 재분화 식물체를 효율적으로 제조하는 방법을 제공함으로써 기존의 조직배양으로 부정아 및 체세포배의 유도가 어려워 식물체 재분화 빈도가 낮거나 재분화가 되지 않아 개체증식에 � �은 어려움이 있는 식물을 정상적인 형태로 재현성있게 재분화시킬 수 있고, 또한 유용한 외래 유전자를 도입시킨 형질전환된 재분화 식물체의 대량증식에도 적용할 수 있다. 또한 본 발명의 방법은 쌍자엽 식물인 오이, 구기자, 고추, 멜론, 강낭콩 그리고 단자엽 식물인 파를 비롯한 모든 종자식물에서 쉽게 부정아를 유도할 수 있으므로 유용 식물의 대량번식, 유용 형질전환식물체 개발 등 식물생명공학 (plant biotechnology)의 모든 분야에 유용하게 사용될 수 있다.
Abstract:
PURPOSE: A method for culturing a tissue is provided to be applied for multiplying a redifferentiated plant and transformed plant conveniently and certainly and to be used efficiently for mass-reproducing a plant and for developing a useful transformed plant. CONSTITUTION: A method is formed by:cutting a seed plant seedling except a certain part of the upper hypocotyl; and contacting the cut surface to a culturing bed for culturing under a light condition for inducing an adventitious shoot with high frequency. Herein, a seedling after 3 - 5 days from sprouting and containing one seed leaf or two leaves being cut to be halves is used for culturing. And the seed plant includes cucumber, Chinese matrimony vine, red pepper, melon, kidney bean, and stone-leek.
Abstract:
본 발명은 고상중합을 이용하여 주쇄에 적어도 한 종류 이상의 방향족 디카르복실산과 한 종류 이상의 지방족 디아민을 포함하는 코폴리아마이드의 제조방법에 관한 것으로서, 특히 분자량이 매우 높은 반결정성 및 반방향족 코폴리아마이드를 짧은 시간 내 제조할 수 있는 코폴리아마이드의 제조방법에 관한 것으로서, 본 발명의 상대점도가 2.0 이상인 고분자 반결정성 및 반방향족 코폴리아마이드 제조방법은, (a) 방향족 디카르복실산 (aromatic dicarboxylic acid), 지방족 디카르복실산 (aromatic dicarboxylic acid) 및 지방족 디아민 (aliphatic diamine)을 포함하는 코폴리아마이드 예비중합물을 제조하는 단계 및 (b) 고상중합을 통하여 상기 코폴리아마이드 예비중합물의 분자량을 증가시키는 단계를 포함하는 것이다.
Abstract:
본 발명의 디플루오로메탄의 제조방법은 다공성 촉매담체에 Pd가 담지된 금속담지촉매를 포함하는 반응기 내의 산소를 제거하는 반응준비단계, 상기 반응기에 수소 및 액화된 클로로디플루오로메탄를 포함하는 혼합물을 주입하고, 상기 반응기 내의 압력이 50 내지 300 bar, 상기 반응기 내의 온도가 300 내지 500 ℃인 초임계유체상에서 수첨탈염소반응으로 디플루오로메탄을 포함하는 반응물을 수득하는 반응단계, 상기 반응물을 냉각하는 냉각단계, 그리고 상기 반응물에서 디플루오로메탄을 수거하는 수거단계를 포함한다. 상기 디플루오로메탄의 제조방법에 의하면, 디플루오로메탄의 수율을 높일 수 있고, 고온고압의 반응을 이용하여 생산량도 높일 수 있으며, 촉매의 코킹 현상을 방지할 수 있다. 또한, 오존층을 파괴하는 것으로 알려진 클로로디플루오로메탄을 회수, 이용하여 재사용이 가능한 디플루오로메탄으로 전환하여 유용성을 높일 수 있다.
Abstract:
PURPOSE: A quantitation method of organomercury in a biological sample is provided to remove spectral interference factors due to a medium, and to draw reliable result. CONSTITUTION: A quantitation method of organomercury in a biological sample comprises: a step of adding hydrochloric acid to the biological sample and preparing digestive fluid; a step of adding an organic solvent to the digestive fluid and extracting an organic layer; a step of adding a solution of a thiol compound to the extracted organic layer, and extracting a thiol compound layer; a step of performing thermal decomposition of an analyte contained in the thiol compound layer, and contacting a gold collector with vapor generated by thermal decomposition; and a step of heating the gold collector. [Reference numerals] (AA) Absorbance[A]; (BB) Time[minutes]
Abstract:
PURPOSE: A manufacturing method of semi-crystalline and semi-aromatic copolyamide is provided to improve reaction rate of chain extending reaction and to obtain semi-crystalline and semi-aromatic copolyamide with extremely high molecular weight within very short reaction time. CONSTITUTION: A manufacturing method of semi-crystalline and semi-aromatic copolyamide comprises: a step of preparing a copolyamide prepolymer comprising an aromatic dicarboxylic acid, aromatic dicarboxylic acid and aliphatic diamine; and a step of increasing the molecular weight of the copolyamide prepolymer through a solid polymerization. The relative viscosity of the copolyamide prepolymer is 1.05 or more. The aromatic dicarboxylic acid is at least one selected from terephthalic acid and isophthalic acid.
Abstract:
PURPOSE: A method for manufacturing a separating membrane coated with metal nano-particles based on supercritical fluid is provided to increase the water permeability of a separating membrane and to reduce the protein absorbent of the separating membrane. CONSTITUTION: A method for manufacturing a separating membrane includes the following: a separating membrane with micro pores is arranged in a high pressure reactor, and a metal precursor, which is capable of being dissolved in supercritical fluid, is introduced into the reactor; the temperature and the pressure of the reactor are maintained with a supercritical condition of supercritical fluid, and the supercritical fluid is introduced into the reactor to prepare a metal precursor dissolved coating solution; the outer surface of the separating membrane and the inner sides of micro pores in the separating membrane are coated with the coating solution; and a reducing agent is introduced into the reactor to reduce the metal precursor into metals to form metal nano-particle coating layers on the outer surface of the separating membrane and the inner sides of the micro pores in the separating membrane.
Abstract:
PURPOSE: A manufacturing method of lithium titanium oxide nanoparticle is provided to provide lithium titanium oxide nanoparticle having excellent extremely uniform particle size distribution, very high lithium-ion transfer rate, high ion conductivity and excellent electrochemical performance. CONSTITUTION: A manufacturing method of lithium titanium oxide nanoparticle comprises a step of preparing lithium precursor solution and titanium precursor solution, a step of forming lithium titanium oxide based negative electrode active material nanoparticle in supercritical fluid condition, by accepting the lithium precursor solution and the titanium precursor solution in a reactor; and a step of cleaning and drying the nanoparticles. The lithium titanium oxide negative electrode active material nanoparticle is a spinel type Li4/3Ti5/3O4 negative electrode active material nanoparticle.
Abstract:
PURPOSE: A successive manufacturing method of phosphate positive active material nanoparticles is provided to improve electrochemical features with an introduction of a metal dopant or a nonmetal dopant, and to control a formation of impurity with an introduction of a reducing agent. CONSTITUTION: The successive manufacturing method of phosphate positive active material nanoparticles includes following steps.(a) A lithium precursor solution, an iron precursor solution, a phosphoric acid precursor solution, a metal dopant or nonmetal dopant precursor solution and a reductant solution are prepared respectively.(b) The solutions of the step(a) are introduced consecutively to a mixer under a supercritical or subcritical condition. A solution containing 'phosphate positive active material nanoparticles' having a chemical formula of LiFe1-xMIxPO4 or Li1-xMIIxFePO4(0