Abstract: This application discloses a beacon for guiding landing of an unmanned aerial vehicle. The beacon includes at least three levels of patterns: one first-level pattern and at least one second-level pattern, where the at least one second-level pattern is superposed above the first-level pattern, and an area of the second-level pattern is less than that of the first-level pattern.

Abstract: Provided in the present invention is an enzyme reaction solution for constructing a sequencing library and the use thereof. The enzyme reaction solution comprises an enzyme composition and a reaction buffer, wherein the enzyme composition comprises a nucleic acid endonuclease, a DNA polymerase, and a polynucleotide kinase; and the reaction buffer comprises a metal salt, a substrate, and a buffer medium aqueous solution. The present application aims to optimize the formulation of an enzyme reaction solution. The cleavage, terminal repair and addition of A to the terminal of a nucleic acid sample is achieved by a one-step reaction. In a suitable buffer system, the enzyme digestion reaction rate and the terminal repair reaction rate reach a balance. In the case where the initial amount of the sample is 100 pg to 1 µg and the processing time is the same, a sequencing library with a consistent length distribution is obtained.

Abstract: The invention provides methods for the production of recombinant adeno-associated virus vectors (rAAV), comprising contacting a host cell with a solution comprising at least one compound of formula (I), (I-A), (I-B), (II), (III), or (IV), or a salt thereof, or a vitamin B, or any combination(s) thereof. Also provided are methods for increasing the production of rAAV by a host cell, comprising contacting a host cell with a solution comprising at least one compound of formula (I), (I-A), (I-B), (II), (III), or (IV), or a salt thereof, or a vitamin B, or any combination(s) thereof.

Abstract: A method includes: receiving a first service request, the first service request including a first account and a first service, and the first service being corresponding to a first quantity of virtual resources; transferring the first quantity of the virtual resources from the first account to a second account of the node device in response to the virtual resources stored in the first account being not less than the first quantity, and providing the first service to the first account; broadcasting a first target block to the blockchain system, the first target block including a resource transfer record and a service provision record corresponding to the first service request; and adding the first target block to a blockchain of the node device in response to the first target block passing a consensus check.

Abstract: The invention provides methods for the production of recombinant adeno-associated virus vectors (rAAV), comprising contacting a host cell with a solution comprising a glucocorticoid analog, such as dexamethasone. Also provided are methods for increasing the production of rAAV by a host cell, comprising contacting a host cell with a solution comprising a glucocorticoid analog, such as dexamethasone.