Abstract: A copper-based alloy material including a multiphase structure containing a matrix of a ? phase and a precipitation phase of a B2-type crystal structure dispersed in the matrix, where the copper-based alloy material includes a composition containing 8.6 to 12.6% by mass of Al, 2.9 to 8.9% by mass of Mn, 3.2 to 10.0% by mass of Ni, and Cu.

Abstract: As a plant cultivation method by an artificial light irradiation which is convenient, highly energy efficient, and excellent in growth promoting effect, a plant cultivation method which promotes the plant growth by conducting a step S1 for irradiating a red illuminative light to a plant and a step S2 for irradiating a blue illuminative light to the plant separately and independently of each other within a certain time period. In this plant cultivation method, an extremely remarkable plant growth promoting effect can be obtained by a method as simple as an alternate irradiation with a red illuminative light and a blue illuminative light.

Abstract: As a simple and convenient method for promoting the proliferation of algae, a method for cultivating the algae while conducting a procedure S1 for irradiating a red illuminative light to the algae and a procedure S2 for irradiating a blue illuminative light to the algae separately and independently of each other within a certain time period is provided.