Abstract: It discloses a lignin enhanced wood-plastic composite, belonging to the field of polymer based composites. The wood-plastic composite is composed of one or more of plant fiber, lignin, a recycled thermoplastic plastic, mineral powder and a processing aid, and is processed by a screw granulating extrusion process. Compared with the prior art, the mechanical properties, heat stability and aging resistance of a wood-plastic material are improved by adding lignin into the wood-plastic material according to the present invention.

Abstract: Provided is a preparation method of a yeast cell immobilization medium, which comprises the following steps: (1) boiling a fiber material in boiling water and drying the fiber material; (2) soaking the fiber material in a surface modified aqueous solution with a concentration of 1-100 g/L, using hydrochloric acid to adjust a PH of the solution to 7.0, fully rinsing the fiber material in deionized water and drying the fiber material; (3) soaking the fiber material in a cross-linking agent aqueous solution with a concentration of 1-100 g/L, fully rinsing the fiber material in deionized water and drying the fiber material; and (4) attaching the fiber material to supporting framework. Also provided is the yeast cell immobilization medium prepared using the preparation method and a method for producing ethanol using the yeast cell immobilization medium.

Abstract: It discloses a lignin enhanced wood-plastic composite, belonging to the field of polymer based composites. The wood-plastic composite is composed of one or more of plant fiber, lignin, a recycled thermoplastic plastic, mineral powder and a processing aid, and is processed by a screw granulating extrusion process. Compared with the prior art, the mechanical properties, heat stability and aging resistance of a wood-plastic material are improved by adding lignin into the wood-plastic material according to the present invention.

Abstract: A nucleotide production process comprises: decomposing an RNA by using a nuclease P1 so as to obtain nucleotides AMP, GMP, CMP and UMP, converting part or all of the nucleotide AMP into a nucleotide IMP by using adenosine deaminase, separating the obtained nucleotide by using an ion exchange resin, and then performing concentration and crystallization to obtain purified nucleotides AMP, GMP, CMP, UMP and IMP or obtain purified nucleotides GMP, CMP, UMP and IMP. The whole biocatalysis production of nucleotides is implemented by using a double-enzyme catalysis method, and high-purity nucleotides are obtained by using an ion resin separation technology and a solvent crystallization method; and the production process is simple and environmentally-friendly, and has low costs, high product safety and purity.

Abstract: It discloses a use of N-acetylneuraminic acid aldolase with an amino acid sequence as shown in SEQ ID NO: 2 in catalytic synthesis of N-acetylneuraminic acid. The preparation of N-acetylneuraminic acid is to use the N-acetylneuraminic acid aldolase with the amino acid sequence as shown in SEQ ID NO: 2 as a catalyst, and N-acetylmannosamine and pyruvic acid as substrates.

Abstract: The invention relates to a method for the production of adenosine 3?,5?-monophosphate (cAMP) by a permeable microbial strain which uses polyols for protecting activities of enzymes and a cAMP precursor and phosphate as substrates. Glucose is used as an energy provider and metal ions and an organic solvent such as acetone are used in the medium.

Abstract: Provided is a preparation method of a yeast cell immobilization medium, which comprises the following steps: (1) boiling a fiber material in boiling water and drying the fiber material; (2) soaking the fiber material in a surface modified aqueous solution with a concentration of 1-100 g/L, using hydrochloric acid to adjust a PH of the solution to 7.0, fully rinsing the fiber material in deionized water and drying the fiber material; (3) soaking the fiber material in a cross-linking agent aqueous solution with a concentration of 1-100 g/L, fully rinsing the fiber material in deionized water and drying the fiber material; and (4) attaching the fiber material to supporting framework. Also provided is the yeast cell immobilization medium prepared using the preparation method and a method for producing ethanol using the yeast cell immobilization medium.

Abstract: The present invention provides Clostridium acetobutylicum and an application thereof. A preservation number of the Clostridium acetobutylicum provided in the invention is CGMCC No. 5234. The Clostridium acetobutylicum provided in the present invention can be used for cogeneration of acetone, butanol, ethanol, and 3-hydroxy butanone through fermentation, so as to improve the economic benefit of butanol fermentation. NAD+ coupling and regeneration can be implemented by adding metabolism or growth regulating substances, so as to improve the product yield, and at the same time, the yield of cogeneration products can be flexibly adjusted, so as to cater for the market demand.

Abstract: It discloses a use of N-acetylneuraminic acid aldolase with an amino acid sequence as shown in SEQ ID NO: 2 in catalytic synthesis of N-acetylneuraminic acid. The preparation of N-acetylneuraminic acid is to use the N-acetylneuraminic acid aldolase with the amino acid sequence as shown in SEQ ID NO: 2 as a catalyst, and N-acetylmannosamine and pyruvic acid as substrates.

Abstract: The present invention provides a method for desorbing and regenerating a butanol-adsorbing hydrophobic macroporous polymer adsorbent, comprising: successively eluting the hydrophobic macroporous polymer adsorbent with butanol adsorbed therein using a water soluble low-boiling-point polar solvent and water. The method provided in the present invention has a simple process, a short separation time, easy, fast and complete desorption and regeneration, low equipment investment and pollution, and reduced energy consumption, and therefore production is easy on a large scale.

Abstract: The present invention provides Clostridium acetobutylicum and an application thereof. A preservation number of the Clostridium acetobutylicum provided in the invention is CGMCC No. 5234. The Clostridium acetobutylicum provided in the present invention can be used for cogeneration of acetone, butanol, ethanol, and 3-hydroxy butanone through fermentation, so as to improve the economic benefit of butanol fermentation. NAD+ coupling and regeneration can be implemented by adding metabolism or growth regulating substances, so as to improve the product yield, and at the same time, the yield of cogeneration products can be flexibly adjusted, so as to cater for the market demand.

Abstract: Disclosed is a method for separating butanol. The method uses hydrophobic macroporous polymer adsorbent to separate butanol in a mixed solution, and the process comprises the following steps: 1) using macroporous polymer adsorbent to adsorb butanol in a mixed solution; 2) desorbing butanol from macroporous polymer adsorbent. The method is simple; the separation time is short; the efficiency of butanol recovery is high; and the separating cost is low.

Abstract: The present invention provides a method for desorbing and regenerating a butanol-adsorbing hydrophobic macroporous polymer adsorbent, comprising: successively eluting the hydrophobic macroporous polymer adsorbent with butanol adsorbed therein using a water soluble low-boiling-point polar solvent and water. After a butanol-containing solution, such as a butanol fermentation liquor, has been adsorbed by a hydrophobic macroporous polymer adsorbent, the butanol adsorbed in the adsorbent can be thoroughly dissolved and removed by the desorption and regeneration method of the present invention; furthermore, the adsorbent can be directly regenerated to recover its adsorption capability on a fixed bed adsorbing the butanol fermentation liquor, wherein the next stage of adsorption process can be directly entered without taking the adsorbent out from the fixed bed; therefore it saves a great deal of time and improves the regeneration efficiency.

Abstract: Disclosed is a method for separating butanol. The method uses hydrophobic macroporous polymer adsorbent to separate butanol in a mixed solution, and the process comprises the following steps: 1) using macroporous polymer adsorbent to adsorb butanol in a mixed solution; 2) desorbing butanol from macroporous polymer adsorbent. The method is simple; the separation time is short; the efficiency of butanol recovery is high; and the separating cost is low.

Abstract: Provided is a crystallization process of cyclic adenosine 3?,5?-monophosphate, which comprises the following steps: 1) reacting an aqueous solution of cyclic adenosine 3?,5?-monophosphate with a base to obtain a salt of cyclic adenosine 3?,5?-monophosphate; 2) reacting the cyclic adenosine 3?,5?-monophosphate salt solution obtained in step 1) with an acid to obtain cyclic adenosine 3?,5?-monophosphate; 3) keeping cyclic adenosine 3?,5?-monophosphate obtained in step 2) at 0-15° C.

Abstract: Disclosed is a method for the production of cyclic adenosine 3?,5?-monophosphate (cAMP) by permeable microbial strain, which uses polyols for protecting activities of enzymes, uses cAMP precursor and phosphate radical ions as substrates, uses glucose as energy provider, and uses metal ions in the mendium. The method is simple, economical and has high yield.