Science learning materials that simulate microstructures

Abstract

In secondary school science education, there was no learning material that allowed junior and senior high school students to arbitrarily determine the structure and conduct an experiment on the diffraction image of visible light, which simulated X-ray crystallography, the most advanced science and technology. 【Solution】By providing a plurality of regularly arranged holes for passing wires around the light-transmitting hole for passing visible light, the way of threading the wires can be arbitrarily changed. As a result, it becomes possible to conduct a diffraction experiment with visible light that simulates X-ray crystallography with a structure arbitrarily determined by junior and senior high school students.

Description

Technical Field

[0001] The present invention is a science learning material that can simulate and reproduce the diffraction image of a regular microstructure such as DNA that can be analyzed by X-ray crystallography with visible light, and can be quantitatively experimented with by junior and senior high school students.

Summary of the Invention

Problems to be Solved by the Invention

[0002] In science education at the secondary level, structural analysis using X-rays and electron beams, and diffraction images of DNA by X-rays are introduced, but there are few learning materials that allow junior and senior high school students to quantitatively experiment with them.

[0003] In recent years, as an experiment simulating X-ray crystallography that can be handled by junior and senior high school students, a diffraction experiment teaching material that irradiates a DNA-mimicking spring with visible light has been developed. However, the spring can only simulate a single helix structure, and cannot handle a double helix structure or other arbitrary structures.

Means for Solving the Problems

[0004] In the present invention, by providing a plurality of holes (2) regularly arranged around the light-transmitting hole (1), the way of passing the wire through the holes can be arbitrarily changed, and thus the structural conditions can be arbitrarily changed including a single helix structure such as a spring.

Effects of the Invention

[0005] According to the present invention, a diffraction experiment with visible light simulating X-ray crystallography, which is a state-of-the-art science and technology in secondary education, can be carried out for any structure. In addition, since junior and senior high school students can arbitrarily devise the way of passing the wire and determine the structure, it is possible to set individual research topics and carry out research activities.

Brief Description of the Drawings

[0006]

Figure 1

Figure 2

Figure 3

Figure 4

Embodiment for Carrying Out the Invention

[0007] As shown in Fig. 2, install the teaching material with a determined structure through a wire as shown in Fig. 3, and by making a laser beam in the visible light region incident on the light-transmitting holes of the teaching material, a diffraction image as shown in Fig. 4 can be obtained on the screen.

Example

[0008] By having junior and senior high school students analyze the interval between bright bands visible in the diffraction image of Fig. 4, the angle at which the bright bands intersect, etc., they can experience the same type of analysis as X-ray structure analysis. Furthermore, the analysis results can be compared with the conditions of Fig. 2, and junior and senior high school students can be encouraged to conduct considerations taking error analysis into account.

[0009] When wires are passed through at equal intervals as shown in Fig. 2 for the case where holes are arranged symmetrically about the axis of the light-transmitting hole as shown in Fig. 1(A) and for the case where the holes on the left and right of the light-transmitting hole are arranged with alternating offsets as shown in Fig. 1(B), Fig. 2(A) forms a double helix structure and Fig. 2(B) forms a single helix structure. In this way, since the structure can be determined by arbitrarily passing a wire through the holes regularly arranged around the light-transmitting hole, individual research topics can be set and research activities can be advanced.

Explanation of Reference Numerals

[0010] 1 Light-transmitting hole 2 Plurality of regularly arranged holes 3 Wire 4 Laser light source 5 Stand 6 Screen

Claims

Claim 1 A plate-shaped experimental instrument having a light-transmitting hole (1) and a plurality of regularly arranged holes (2) for passing thin wires around it, which is a science learning material for secondary education that can reproduce, in visible light, the diffraction image of the regular fine structure of DNA as seen by X-ray structural analysis.

Images