Abstract: A degradable biomedical magnesium alloy drug-eluting vascular stent and a preparation method. With the total weight of a magnesium alloy being 100% for calculation, the magnesium alloy comprises the following components in percentage by weight: 3.0-6.0% of Gd, 2.5-5.5% of Y, 1.0-3.0% of Li, 0.3-1.0% of Zn, 0.2-1.0% of Zr, and the balance being Mg. The stent has good radial support strength and strain dispersion capability by means of finite element design. After a protective coating is used, the corrosion resistance of the magnesium alloy stent is greatly improved. An arsenic trioxide/rapamycin and tacrolimus composite drug sustained-release system is used to fully adapt to the damage repair process of blood vessels. An implantation result of large animals shows that the vascular stent system has a good anti-restenosis treatment effect.

Abstract: A method, an apparatus, and an electronic device for providing product object information are disclosed. The method includes: providing an interactive content in a process of playing a live video content associated with a product object, the interactive content being generated according to a material associated with the product object, and the material being used to describe attributes of the product object; and providing a change process of the interactive content according to the material in a process of responding to interactive operation information inputted by a user, to enable a presentation of multiple attributes of the product object. Through the embodiments of the present disclosure, the product object information can be provided to consumers in a more comprehensive and intuitive manner, so as to help the users to make better shopping decisions.

Abstract: A rice nitrogen of panicle fertilizer accurate recommendation method based on crop model and remote sensing coupling includes the following steps: S1. constructing a basic database; S2. agricultural parameter inversion modeling based on the remote sensing vegetation index; S3. rice nitrogen nutrition diagnosis based on the nitrogen nutrition index NNI; and S4. accurately recommending panicle fertilizer nitrogen based on a crop growth model and remote sensing nitrogen nutrition diagnosis. According to the method, the rice growth trend and nitrogen nutrition estimation in the key growth period is achieved through a remote sensing inversion technology, a multi-source remote sensing inversion spatial dataset based on the rice growth trend is taken as a combination point coupling crop growth model to simulate the rice yield in real time, the rice nitrogen nutrition condition and the nitrogen demand are further combined, and the plots-level nitrogen of panicle fertilizer accurate recommendation is finally achieved.

Abstract: A method, an apparatus, and an electronic device for providing product object information are disclosed. The method includes: providing an interactive content in a process of playing a live video content associated with a product object, the interactive content being generated according to a material associated with the product object, and the material being used to describe attributes of the product object; and providing a change process of the interactive content according to the material in a process of responding to interactive operation information inputted by a user, to enable a presentation of multiple attributes of the product object. Through the embodiments of the present disclosure, the product object information can be provided to consumers in a more comprehensive and intuitive manner, so as to help the users to make better shopping decisions.

Abstract: A soil-climate intelligent type determination method for rice target yield and nitrogen fertilizer amount includes steps: construct a basic database; obtain historical weather data from the region where the rice planting area is to be determined over the past few years, and obtain real-time GFS weather data of the region in a predicted year; obtain 100 m×100 m grid sampling point soil data and a rice field vector layer of rice planting area to be determined; obtain at least three years of nitrogen fertilizer gradient test data of the rice planting area to be determined, rice variety information and management data of each farmer in each year; obtain accurate weather data of the prediction year; prepare soil data of 100 m×100 m plot-scale; localize genetic parameters of the rice growth model DSSAT; and run the localized DSSAT model to predict the plot-scale target yield and recommend the nitrogen application amount.

Abstract: The invention provides an Escherichia coli for synthesizing L-valine, a construction method and use thereof. The Escherichia coli of the invention is designated as Escherichia coli W3110 and was deposited in China Center for Type Culture Collection (Address: Bayi Road, Wuchang District, Wuhan City, Hubei Province) under the Accession No. CCTCC M 2022293 on Mar. 18, 2022. The recombinant Escherichia coli takes Escherichia coli as a starting strain, and a transcription regulation factor is overexpressed to obtain a recombinant Escherichia coli. The recombinant Escherichia coli for synthesizing L-valine of the invention is fermented in a 5 L fermentor with trace dissolved oxygen to test strains, the yield of L-valine reaches 112 g/L, and the OD of the bacterium is 104.

Abstract: A genetically engineered strain having high-yield of L-valine is disclosed. Starting from Escherichia coli W3110, an acetolactate synthase gene alsS of Bacillus subtilis is inserted into a genome thereof and overexpressed; a ppGpp 3?-pyrophosphate hydrolase mutant R290E/K292D gene spoTM of Escherichia coli is inserted into the genome and overexpressed; a lactate dehydrogenase gene ldhA, a pyruvate formate lyase I gene pflB, and genes frdA, frdB, frdC, frdD of four subunits of fumaric acid reductase are deleted from the genome; a leucine dehydrogenase gene bcd of Bacillus subtilis replaces a branched chain amino acid transaminase gene ilvE of Escherichia coli; and an acetohydroxy acid isomeroreductase mutant L67E/R68F/K75E gene ilvCM replaces the native acetohydroxy acid isomeroreductase gene ilvC of Escherichia coli. Furthermore, the L-valine fermentation method is improved by using a two-stage dissolved oxygen control. The L-valine titer and the sugar-acid conversion rate are increased.

Abstract: A method, an apparatus, and an electronic device for providing product object information are disclosed. The method includes: providing an interactive content in a process of playing a live video content associated with a product object, the interactive content being generated according to a material associated with the product object, and the material being used to describe attributes of the product object; and providing a change process of the interactive content according to the material in a process of responding to interactive operation information inputted by a user, to enable a presentation of multiple attributes of the product object. Through the embodiments of the present disclosure, the product object information can be provided to consumers in a more comprehensive and intuitive manner, so as to help the users to make better shopping decisions.

Abstract: A genetically engineered strain having high-yield of L-valine is disclosed. Starting from Escherichia coli W3110, an acetolactate synthase gene alsS of Bacillus subtilis is inserted into a genome thereof and overexpressed; a ppGpp 3?-pyrophosphate hydrolase mutant R290E/K292D gene spoTM of Escherichia coli is inserted into the genome and overexpressed; a lactate dehydrogenase gene ldhA, a pyruvate formate lyase I gene pflB, and genes frdA, frdB, frdC, frdD of four subunits of fumaric acid reductase are deleted from the genome; a leucine dehydrogenase gene bcd of Bacillus subtilis replaces a branched chain amino acid transaminase gene ilvE of Escherichia coli; and an acetohydroxy acid isomeroreductase mutant L67E/R68F/K75E gene ilvCM replaces the native acetohydroxy acid isomeroreductase gene ilvC of Escherichia coli. Furthermore, the L-valine fermentation method is improved by using a two-stage dissolved oxygen control. The L-valine titer and the sugar-acid conversion rate are increased.