Abstract: A device for cooperatively treating aquaculture tail water by algae and bacteria is provided, including an aquaculture part; the aquaculture part is communicated with a sewage discharge part, and the sewage discharge part is communicated with a tail water treatment part, and the tail water treatment part is communicated with the aquaculture part; the sewage discharge part includes a sewage pipe communicated with the aquaculture part, where one end of the sewage pipe away from the aquaculture part is communicated with the tail water treatment part, and a sewage pump is arranged on the sewage pipe; the tail water treatment part includes a second shell, a bottom end of the second shell is communicated with the sewage pipe, a top end of a side wall of the second shell is communicated with the aquaculture part, several guide plates are arranged in the second shell.

Abstract: A Near Field Communication (NFC) tag and a control system for the NFC tag are provided. The NFC tag includes: a NFC coil, a control circuit, an energy acquisition circuit, and an energy storage circuit, wherein the NFC coil is configured to detect a magnetic field signal transmitted by a card reader when a distance between the NFC tag and the card reader is within a predetermined distance range; the energy acquisition circuit is configured to convert the magnetic field signal into an electrical signal when the NFC coil detects the magnetic field signal; and the control circuit is configured to control the energy acquisition circuit to transmit the electrical signal to the energy storage circuit, and control to charge the energy storage circuit through the electrical signal.

Abstract: The present invention relates to a compound as shown in general formula (I) below (in formula (I), each of R1 and R2 independently represents a hydrogen atom or a C1-10 linear or branched alkyl optionally having a substituent, or the two together form a cycloalkyl with 3 to 8 ring carbon atoms; each of R3 and R4 independently represents a hydrogen atom or a C1-10 linear or branched alkyl optionally having a substituent or a C6-12 aryl optionally having a substituent, or the two together form a cycloalky with 3 to 8 ring carbon atoms; X represents C or N; and Y represents a linear or branched alkenyl or alkynyl with 2 to 6 carbon atoms and optionally having a substituent, or carboxyl). The compound has good antibacterial properties against bacteria, especially gram-negative bacteria, has low drug resistance, and has good prospects for the effective treatment of various conditions.

Abstract: Provided are a lycium barbarum leaf polysaccharide rich in galacturonic acid and a preparation method and use thereof. The method includes: mixing a lycium barbarum leaf and an acetone aqueous solution to obtain a mixture, and performing a fading treatment on the mixture to obtain a faded lycium barbarum leaf; extracting the faded lycium barbarum leaf with a chelating agent solution to obtain an extract solution; subjecting the extract solution to an alcohol precipitation with ethanol to obtain an alcohol precipitate; and subjecting the alcohol precipitate to an alcohol washing, a water redissolution, a dialysis and a drying in sequence to obtain the lycium barbarum leaf polysaccharide rich in galacturonic acid.

Abstract: Provided are a polymyxin derivative having a general formula I structure, and a preparation method and an application thereof. The method for preparing the polymyxin derivative comprises the following steps: (1) an Fmoc-AA-OP side chain free amino group of a protected basic amino acid reacting with a halogenated resin to obtain an Fmoc-AA-OP-resin; (2) the Fmoc-AA-OP-resin being coupled one by one to obtain a linear peptide-resin; (3) the linear peptide-resin selectively removing a protective group, and carrying out solid-phase cyclization to obtain a cyclic peptide-resin; (4) the cyclic peptide-resin undergoing acidic hydrolysis and ether precipitation to obtain a crude product of a cyclic polypeptide; (5) the crude product being purified and/or salt transferred and lyophilized to obtain a pure product of the cyclic polypeptide.