Abstract: The present invention relates to a crystal form I of tenvermectin B, which can be characterized by X-ray powder diffraction (XRPD) pattern, Infrared (IR) absorption spectrum, Differential scanning calorimetry (DSC) thermogram and the like. Meanwhile, the present invention also relates to a method for preparing the crystal form I of tenvermectin B and a use thereof.

Abstract: The present invention provides a method for preparing a food fumeol, a method for preparing a food fumeol from Perilla frutescens as a raw material and application. The method for preparing a food fumeol includes: respectively preparing a single fumeol from each of n raw materials; and then, mixing at least two kinds of single fumeols to prepare the food fumeol, wherein n is a positive integer being greater than or equal to 2. According to application of the food fumeol, food is liquid smoked by using the food fumeol of the present application. The types and flavors of the food fumeol are greatly enriched, and the development of the food fumeol of different types and flavors is facilitated. A Perilla frutescens fumeol having a natural unique flavor prepared by the method for preparing the food fumeol from Perilla frutescens as the raw material contains rich flavor substances, and achieves antibacterial and antioxidant effects.

Abstract: A method for improving plant insect resistance includes providing target genes derived from insects. Constructs based on the nucleotide sequences of these target genes are designed to form interfering molecules. After being eating by insects, the plant can significantly inhibit expression of corresponding genes in insects. This inhibition is not affected by barrier of the insect digestive systems. The method can improve the insect resistance of plants, reduce pesticide applications, lower the costs of agricultural production, and protect the environment.

Abstract: A method includes increasing EXPA1 gene expression or increasing the activity of EXPA1 polypeptide to produce a plant with an improved trait. The method may further include increasing the expression of RDL1 gene or the activity of RDL1 kpolypeptide. expression of GhRDL1 and GhEXPA1 Co-expression of EXPA1 and RDL genes can improve plant traits. These methods have applications in crops and flower productions.

Abstract: A method for improving insect resistance of plants, in which dsRNA of insect's gene is expressed in plants by using transgenic technique, and then the interfering RNAs are formed in the plants. The interfering RNAs then enter into insects' bodies after being ingested by the insect that eats the plant, and conduct RNA interference against the target gene, thereby expression of the target gene is suppressed by RNA interference. A new plant-mediated method for improving insect resistance by suppressing the growth of insects by RNA interference mechanism.

Abstract: A method for improving plant insect resistance includes providing target genes derived from insects. Constructs based on the nucleotide sequences of these target genes are designed to form interfering molecules. After being eating by insects, the plant can significantly inhibit expression of corresponding genes in insects. This inhibition is not affected by barrier of the insect digestive systems. The method can improve the insect resistance of plants, reduce pesticide applications, lower the costs of agricultural production, and protect the environment.

Abstract: A method for improving insect resistance of plants, in which dsRNA of insect's gene is expressed in plants by using transgenic technique, and then the interfering RNAs are formed in the plants. The interfering RNAs then enter into insects' bodies after being ingested by the insect that eats the plant, and conduct RNA interference against the target gene, thereby expression of the target gene is suppressed by RNA interference. A new plant-mediated method for improving insect resistance by suppressing the growth of insects by RNA interference mechanism.