Abstract: The present disclosure provides a fire retardant wood, a preparation method thereof, and a use of metal halide. The preparation method of fire retardant wood includes: impregnating a wood with a salt solution. By injecting low-cost metal halide into the interior of wood, the present disclosure obtains wood with natural color and texture and high flame retardant ability, which is very suitable for use in decorative environment and is expected to be applied in many fields such as furniture, architecture, shipbuilding and ancient wood preservation.

Abstract: A preparation method and an application method of a multifunctional intelligent cellulose-based visual label are provided. The multifunctional intelligent cellulose-based visual label solved a problem that an existing freshness indicator film is narrowed in an indication range. The preparation method includes the following steps: step 1 of carboxylation modification; step 2 of cationic grafting; step 3 of preparation of a composite dye solution; step 4 of preparation of responsive fibers; and step 5 of performing vacuum filtration to prepare paper, thereby obtaining the multifunctional intelligent cellulose-based visual label. The food freshness is indicated with the obtained intelligent visual label. An indicated pH value range is 4-8, color variation can be completed within 30 seconds, and the food freshness can be accurately indicated. The multifunctional intelligent cellulose-based visual label is low-carbon, efficient, green, safe, and wide in the indication range, and can be used in food monitoring.

Abstract: Provided is a method for planting a mixed forest of yew trees and fig trees. Yew trees and fig trees are interplanted based on characteristics of yew trees and fig trees. A seedling bed method is used in the plain zones, and a terrace field method is used in mountain zones in order to improve land utilization rate and make full use of complementary advantages of ecological niches. In the present disclosure, ground and underground spaces on tree growing site are fully used. Fig trees grow fast and have large leaves, thus shading part of sunlight for yew trees and savings costs required for building shade shelters for yew trees. By using the method for constructing a mixed forest in the present disclosure, the constructed mixed forest not only allows for increase of biomass, but also provides higher paclitaxel content in yew trees than that in pure forest.

Abstract: Provided is a method for planting a mixed forest of yew trees and fig trees. Yew trees and fig trees are interplanted based on characteristics of yew trees and fig trees. A seedling bed method is used in the plain zones, and a terrace field method is used in mountain zones in order to improve land utilization rate and make full use of complementary advantages of ecological niches. In the present disclosure, ground and underground spaces on tree growing site are fully used. Fig trees grow fast and have large leaves, thus shading part of sunlight for yew trees and savings costs required for building shade shelters for yew trees. By using the method for constructing a mixed forest in the present disclosure, the constructed mixed forest not only allows for increase of biomass, but also provides higher paclitaxel content in yew trees than that in pure forest.

Abstract: The present invention disclosed N-acetyl amino acid ester derivatives of betulin and the preparation method thereof, the method comprising the steps that in the presence of an alkaline substance, a catalyst and a racemization-inhibitor, the carboxyl group of N-acetyl amino acid is activated by a coupling agent; and then the activated N-acetyl amino acid is reacted with betulin via esterification reaction to obtain the N-acetyl amino acid ester derivative of betulin. The present invention provided a simple synthesis method to synthesize the N-acetyl amino acid ester derivatives of betulin by using betulin as a precursor compound and modifying the molecular structure of betulin. Such structural modification of betulin significantly enhances the anti-tumor activity of the betulin derivatives and therefore has important values.

Abstract: The present invention disclosed N-acetyl amino acid ester derivatives of betulin and the preparation method thereof, the method comprising the steps that in the presence of an alkaline substance, a catalyst and a racemization-inhibitor, the carboxyl group of N-acetyl amino acid is activated by a coupling agent; and then the activated N-acetyl amino acid is reacted with betulin via esterification reaction to obtain the N-acetyl amino acid ester derivative of betulin. The present invention provided a simple synthesis method to synthesize the N-acetyl amino acid ester derivatives of betulin by using betulin as a precursor compound and modifying the molecular structure of betulin. Such structural modification of betulin significantly enhances the anti-tumor activity of the betulin derivatives and therefore has important values.

Abstract: Provided is a 10-methoxycamptothecine derivate of formula (1), wherein R is selected from hydrogen, C1-6 alkyl, C1-6 haloalkyl, aryl substituted C1-6 alkyl, phosphate substituted C1-6 alkyl, amino-substituted C1-6 alkyl, carboxyl substituted C1-6 alkyl, hydroxyl substituted C1-6 alkyl, and amide-substituted C1-6 alkyl; R1 is selected from hydrogen and t-butoxycarbonyl substituted amino. Also provided in the present invention are the preparation method of the derivate and the use thereof in anti-tumor drug preparation.

Abstract: Provided is a 10-methoxycamptothecine derivate of formula (1), wherein R is selected from hydrogen, C1-6 alkyl, C1-6 haloalkyl, aryl substituted C1-6 alkyl, phosphate substituted C1-6 alkyl, amino-substituted C1-6 alkyl, carboxyl substituted C1-6 alkyl, hydroxyl substituted C1-6 alkyl, and amide- substituted C1-6 alkyl; R1 is selected from hydrogen and t-butoxycarbonyl substituted amino. Also provided in the present invention are the preparation method of the derivate and the use thereof in anti-tumor drug preparation.