Abstract: The invention provides a Saccharomyces cerevisiae strain for producing a human milk lipid substitute. By integrating a heterologous lysophosphatidic acid acyltransferase into Saccharomyces cerevisiae and knocking out its own natural lysophosphatidic acid acyltransferase, the content of palmitic acid (C16:0) at Sn-2 position of triacylglycerol produced by Saccharomyces cerevisiae is increased, to synthesize a human milk lipid substitute. On this basis, a metabolic pathway related gene is knocked out, to further increase the content of human milk lipid substitute in the product. In the present invention, a human milk lipid substitute is de novo synthesized by Saccharomyces cerevisiae for the first time, in which the total fatty acid is 15% or more, and the relative content of C16:0 at Sn-2 position reaches about 60%.

Abstract: The present invention discloses bionic stratospheric airships, related to the technical field of aircraft. The hull shape of the bionic stratospheric airship is obtained by lofting the shape of physalia physalis; one or more buoyancy gasbags, one or more ballonets, and a heat regulating gasbag are provided inside the hull; the buoyancy gasbags are filled with lighter-than-air gas and are provided at an upper layer inside the hull; the ballonets are filled with air and are provided at a lower layer inside the hull; the heat regulating gasbag is provided at a middle layer inside the hull and is filled with a working medium reversibly regulated between a gas state and a liquid state; and a thermodynamic cycle device for heating or pressurizing the working medium is provided inside the heat regulating gasbag.

Abstract: The present invention discloses bionic stratospheric airships, relate to the technical field of aircrafts. the hull shape of the bionic stratospheric airship is obtained by lofting the shape of physalia physalis; one or more buoyancy gasbags, one or more ballonets, and a heat regulating gasbag are provided inside the hull; the buoyancy gasbags are filled with lighter-than-air gas and are provided at an upper layer inside the hull; the ballonets are filled with air and are provided at a lower layer inside the hull; the heat regulating gasbag is provided at a middle layer inside the hull and is filled with a working medium reversibly regulated between a gas state and a liquid state; and a thermodynamic cycle device for heating or pressurizing the working medium is provided inside the heat regulating gasbag.