Abstract: A myostatin (MSTN) protein mutant and a preparation method thereof are provided. The amino acid sequence of the mutant is any one of the sequences shown in SEQ ID NO. 15, SEQ ID NO. 17 or SEQ ID NO. 20. Under the guidance of specially designed single guide ribonucleic acid (sgRNA), a mutant in which the 281st and/or 282nd cysteine of the sheep myostatin full length protein containing the signal peptide is mutated into arginine is obtained through adenine base editor (ABE) editing, and the nucleotide sequence of the sgRNA is shown in SEQ ID NO. 5.

Abstract: A semiconductor cooling and heating device includes a mounting housing, a cooling and heating semiconductor, and contact pieces. The cooling and heating semiconductor is arranged in the mounting housing, a plurality of contact pieces for contacting with a nursing part are movably connected with the mounting housing along a peripheral surface of the mounting housing, and one end of each contact piece abuts against the cooling and heating semiconductor. The cooling and heating semiconductor enables temperature control and cooling and heating output; the abutment of the contact pieces and the cooling and heating semiconductor enables a quick transfer of temperature to the nursing part; the plurality of contact pieces provided on the peripheral surface of the same mounting housing can provide nursing for multiple parts, and compared with the conventional large-volume and bulky form of separately set nursing components for multiple parts.

Abstract: A cosmetology instrument includes a housing, a heat dissipation assembly, a semiconductor chilling and heating plate, and an electronic component. The housing includes a first housing and a second housing, the electronic component and the heat dissipation assembly are disposed in the first housing, the semiconductor chilling and heating plate is disposed in the second housing, and the first housing is connected with the second housing through the heat dissipation assembly; a circumferential air outlet is formed by a gap between the first housing and the second housing, and the first housing is provided with an air inlet; and an air channel is formed between the electronic component and an inner wall of the housing.

Abstract: A device for cold compress and hot compress includes a compress bag, a control device, and a heat dissipation device. The compress bag includes a semiconductor chilling plate and a working surface, and the semiconductor chilling plate is disposed on the working surface; and the heat dissipation device includes a cooling medium circulation device, the cooling medium circulation device includes a circulation passage and a cooling medium, and the circulation passage is formed in the compress bag and is adjacent to one side, away from the working surface, of the semiconductor chilling plate. Through rapid cooling and heating of the semiconductor chilling plate, temperature adjustment on the working surface of the compress bag is achieved to meet the demand for cold compress and hot compress of a user; the semiconductor chilling plate is directly disposed on the working surface of the compress bag.

Abstract: A method and system for associating one or more contents with an electronic page. The method includes receiving a request for the electronic page from a user. The method further includes processing the request in a predefined manner. Thereafter, the method includes selecting one or more contents in response to processing the request. Further, the method includes rendering one or more contents along with the electronic page in a predetermined format.

Abstract: A method and system for associating one or more contents with an electronic page. The method includes receiving a request for the electronic page from a user. The method further includes processing the request in a predefined manner. Thereafter, the method includes selecting one or more contents in response to processing the request. Further, the method includes rendering one or more contents along with the electronic page in a predetermined format.