Abstract: Methods for catalyzing C—H insertion reactions using heme enzymes are described. The present disclosure provides a method for producing a C—H insertion product comprising providing an substrate having an sp3-hybridized C—H bond, a carbene precursor such as a diazo reagent, and a heme enzyme, and admixing the components in a reaction for a time sufficient to produce the C—H insertion product. Heme enzyme variants useful for carrying out in vivo and in vitro C—H insertion reactions, as well as expression vectors and host cells expressing the heme enzymes, are also described.

Abstract: A media file presentation method is disclosed, applicable to an application client and performed at a computing device. The computing device performs a blocking operation on a process of switching from a background state to a suspended state and covers a page screenshot by using a to-be-presented media file in the process of switching from the background state to the suspended state, the page screenshot being captured in a process of switching from a foreground state to the background state. Finally, the computing device presents the media file covering the page screenshot in a process of switching from the suspended state to the foreground state.

Abstract: Methods for catalyzing C—H insertion reactions using heme enzymes are described. The present disclosure provides a method for producing a C—H insertion product comprising providing an substrate having an sp3-hybridized C—H bond, a carbene precursor such as a diazo reagent, and a heme enzyme, and admixing the components in a reaction for a time sufficient to produce the C—H insertion product. Heme enzyme variants useful for carrying out in vivo and in vitro C—H insertion reactions, as well as expression vectors and host cells expressing the heme enzymes, are also described.

Abstract: A media file presentation method is disclosed, applicable to an application client and performed at a computing device. The computing device performs a blocking operation on a process of switching from a background state to a suspended state and covers a page screenshot by using a to-be-presented media file in the process of switching from the background state to the suspended state, the page screenshot being captured in a process of switching from a foreground state to the background state. Finally, the computing device presents the media file covering the page screenshot in a process of switching from the suspended state to the foreground state.

Abstract: Disclosed is a method and device for reporting mobile terminal behaviors, including: acquiring a configuration information from a server in a preset time interval continuously; determining whether the configuration information acquired before and after the preset time interval is the same; if it is the same, then prolonging the preset time interval by a modified duration; if it is different, then resetting the preset time interval to the initial duration; and monitoring a user's behavior according to the configuration information, when an occurrence of the user's behavior is monitored, acquiring the behavior data of the user's behavior from local and reporting the behavior data to the server.

Abstract: The present invention provides methods for catalyzing the conversion of an olefin to a compound containing one or more aziridine functional groups using heme enzymes. In certain aspects, the present invention provides a reaction mixture for producing an aziridination product, the reaction mixture comprising of an olefinic substrate, a nitrene precursor, and a heme enzyme. In other certain aspects, the present invention provides a method for producing an aziridination product comprising providing an olefinic substrate, a nitrene precursor, and a heme enzyme; and admixing the components in a reaction for a time sufficient to produce an aziridine product. In other aspects, the present invention provides heme enzymes including variants and fragments thereof that are capable of carrying out in vivo and in vitro olefin aziridination reactions. Expression vectors and host cells expressing the heme enzymes are also provided by the present invention.