摘要:
A method of isolating 1,3-propanediol from a solution containing 1,3-propanediol, 1,2-propanediol, glycerol, and glucose is provided. The method includes: obtaining a concentrate by concentrating the solution via reduced pressure evaporation; dissolving the concentrate in a solvent selected from the group consisting of ethyl acetate, methyl ethyl ketone, and a mixture thereof and leaving the solution alone to fractionate the compounds in a solvent layer and a water layer; and loading the solvent layer in a silica-filled column under a low pressure liquid chromatography condition and eluting the solvent layer with a mixed solvent of methanol and at least one solvent which is miscible with methanol and has a polarity lower than methanol.
摘要:
A method of isolating 1,3-propanediol from a solution containing 1,3-propanediol, 1,2-propanediol, glycerol, and glucose is provided. The method includes: obtaining a concentrate by concentrating the solution via reduced pressure evaporation; dissolving the concentrate in a solvent selected from the group consisting of ethyl acetate, methyl ethyl ketone, and a mixture thereof and leaving the solution alone to fractionate the compounds in a solvent layer and a water layer; and loading the solvent layer in a silica-filled column under a low pressure liquid chromatography condition and eluting the solvent layer with a mixed solvent of methanol and at least one solvent which is miscible with methanol and has a polarity lower than methanol.
摘要:
A method of writing data in a resistive memory device includes performing a test operation to distinguish normal memory cells from weak memory cells, during a write operation directed to normal memory cells using a write current and during a weak write operation directed to weak memory cells using a higher write current.
摘要:
The present invention relates to a refrigerator, including: a refrigerating cycle having an evaporator (1a); a space for exchanging heat with the evaporator; a region for exchanging heat between the evaporator and the space; and a storage chamber and a door for defining the space, wherein at least one of the region, the storage chamber and the door has undergone at least one of a Kimchi lactic acid bacteria culture treatment and a Kimchi lactic acid bacteria culture exposure treatment.
摘要:
We describe a voltage level coding system and method. The voltage level coding system includes a level encoder having an input to receive data segments coded using a first code and an output to supply second data codes indicating one of 2N plus at least one additional voltage level to which each data segment is assigned. A converter converts the second data codes into such voltage levels. A controller output supplies the voltage levels. A method for coding digital data includes determining a first data transition, generating a code that includes at least one additional level that minimizes data skew in the first data transition, and coding the first data transition with the additional level in the code.
摘要:
A data driving circuit includes a driver in which a driving current is controlled in response to predetermined bits of digital control signal and which receives a differential input data signal to generate differential output data signal; and a digital control signal generator for storing and generating the digital control signal. The driver includes a pre-driver for passing a pre driving current in response to a bias voltage and for receiving the differential input data signal(s) to generate first and second signals; and a main driver in which a main driving current is controlled in response to the digital control signal and which generates the differential output data signals in response to the first and second signals. The data driving circuit can not only vary an amplitude and a level but also shift a level, and by varying a current of the current sources in response to the digital control signal, a margin is secured in a saturation region of transistors which constitute the current sources, thereby generating a stable differential output data signals insensitive to a noise.
摘要:
The present invention relates to a method for mass production of taxol by semi-continuous culture of Taxus genus plant with a high yield. According to the present invention, taxol can be prepared with a high yield, by employing semi-continuous culture of Taxus genus plant cell, which comprises: (i) inoculating Taxus genus plant cell on a medium containing 1 to 10% (w/v) sugar, and incubating it; and, (ii) transferring 1/10 to 1/2 volume of the culture obtained in the step (i) to a fresh medium and repeating the step (i), adding 1 to 10% (w/v) sugar to the remnant culture and incubating to the time of maximum production of taxol.
摘要:
The present invention relates to an optical film having improved optical performance and to a backlight unit comprising the same. More particularly, the present invention relates to a microlens array (MLA) sheet which comprises a base unit and a lens unit formed on one side of the base unit, wherein the lens unit consists of a plurality of conical lenses. Existing hemispherical microlens array sheets have limitations in terms of improving luminance, and therefore cannot replace prism sheets in high luminance product s. However, the microlens array sheet consisting of conical lenses of the present invention can improve both luminance and viewing angle characteristics.
摘要:
A nonvolatile memory device and system having a nonvolatile memory device accessible with a DRAM protocol for generating a first command signal and a second command signal based on a row address strobe signal and a column address strobe signal and storing an n-bit row address signal based on the first command signal, an n-bit column address signal based on the second command signal, and decoding the n-bit row address signal and the n-bit column address signal to synchronously provide a row selection signal and a column selection signal to a memory cell array.
摘要:
The present invention relates to a door duct assembly for a refrigerator. In the present invention, the cold air delivered from a cold air duct of a refrigerator main body to a door 30 through a cold air communication portion 55 is discharged into a storage space through cold air vents 61 formed in a flow guide 60. The cold air communication portion 55 is formed in a door basket 40 or the flow guide 60. The door baskets 40 or the flow guide 60 is mounted on a door liner 33 defining a rear surface of the door 30. According to the present invention, there are advantages in that it is relatively easy to manufacture a door, the cold air flows uniformly in the door, the strength of the flow guide for defining a flow channel in the door is relatively increased, and dewdrops are prevented from being formed upstream of the flow channel.